diff options
Diffstat (limited to 'vendor/github.com/pquerna/ffjson/fflib/v1')
17 files changed, 6782 insertions, 0 deletions
diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/buffer.go b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer.go new file mode 100644 index 000000000..7f63a8582 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer.go @@ -0,0 +1,421 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +// Simple byte buffer for marshaling data. + +import ( + "bytes" + "encoding/json" + "errors" + "io" + "unicode/utf8" +) + +type grower interface { + Grow(n int) +} + +type truncater interface { + Truncate(n int) + Reset() +} + +type bytesReader interface { + Bytes() []byte + String() string +} + +type runeWriter interface { + WriteRune(r rune) (n int, err error) +} + +type stringWriter interface { + WriteString(s string) (n int, err error) +} + +type lener interface { + Len() int +} + +type rewinder interface { + Rewind(n int) (err error) +} + +type encoder interface { + Encode(interface{}) error +} + +// TODO(pquerna): continue to reduce these interfaces + +type EncodingBuffer interface { + io.Writer + io.WriterTo + io.ByteWriter + stringWriter + truncater + grower + rewinder + encoder +} + +type DecodingBuffer interface { + io.ReadWriter + io.ByteWriter + stringWriter + runeWriter + truncater + grower + bytesReader + lener +} + +// A Buffer is a variable-sized buffer of bytes with Read and Write methods. +// The zero value for Buffer is an empty buffer ready to use. +type Buffer struct { + buf []byte // contents are the bytes buf[off : len(buf)] + off int // read at &buf[off], write at &buf[len(buf)] + runeBytes [utf8.UTFMax]byte // avoid allocation of slice on each WriteByte or Rune + encoder *json.Encoder + skipTrailingByte bool +} + +// ErrTooLarge is passed to panic if memory cannot be allocated to store data in a buffer. +var ErrTooLarge = errors.New("fflib.v1.Buffer: too large") + +// Bytes returns a slice of the contents of the unread portion of the buffer; +// len(b.Bytes()) == b.Len(). If the caller changes the contents of the +// returned slice, the contents of the buffer will change provided there +// are no intervening method calls on the Buffer. +func (b *Buffer) Bytes() []byte { return b.buf[b.off:] } + +// String returns the contents of the unread portion of the buffer +// as a string. If the Buffer is a nil pointer, it returns "<nil>". +func (b *Buffer) String() string { + if b == nil { + // Special case, useful in debugging. + return "<nil>" + } + return string(b.buf[b.off:]) +} + +// Len returns the number of bytes of the unread portion of the buffer; +// b.Len() == len(b.Bytes()). +func (b *Buffer) Len() int { return len(b.buf) - b.off } + +// Truncate discards all but the first n unread bytes from the buffer. +// It panics if n is negative or greater than the length of the buffer. +func (b *Buffer) Truncate(n int) { + if n == 0 { + b.off = 0 + b.buf = b.buf[0:0] + } else { + b.buf = b.buf[0 : b.off+n] + } +} + +// Reset resets the buffer so it has no content. +// b.Reset() is the same as b.Truncate(0). +func (b *Buffer) Reset() { b.Truncate(0) } + +// grow grows the buffer to guarantee space for n more bytes. +// It returns the index where bytes should be written. +// If the buffer can't grow it will panic with ErrTooLarge. +func (b *Buffer) grow(n int) int { + // If we have no buffer, get one from the pool + m := b.Len() + if m == 0 { + if b.buf == nil { + b.buf = makeSlice(2 * n) + b.off = 0 + } else if b.off != 0 { + // If buffer is empty, reset to recover space. + b.Truncate(0) + } + } + if len(b.buf)+n > cap(b.buf) { + var buf []byte + if m+n <= cap(b.buf)/2 { + // We can slide things down instead of allocating a new + // slice. We only need m+n <= cap(b.buf) to slide, but + // we instead let capacity get twice as large so we + // don't spend all our time copying. + copy(b.buf[:], b.buf[b.off:]) + buf = b.buf[:m] + } else { + // not enough space anywhere + buf = makeSlice(2*cap(b.buf) + n) + copy(buf, b.buf[b.off:]) + Pool(b.buf) + b.buf = buf + } + b.off = 0 + } + b.buf = b.buf[0 : b.off+m+n] + return b.off + m +} + +// Grow grows the buffer's capacity, if necessary, to guarantee space for +// another n bytes. After Grow(n), at least n bytes can be written to the +// buffer without another allocation. +// If n is negative, Grow will panic. +// If the buffer can't grow it will panic with ErrTooLarge. +func (b *Buffer) Grow(n int) { + if n < 0 { + panic("bytes.Buffer.Grow: negative count") + } + m := b.grow(n) + b.buf = b.buf[0:m] +} + +// Write appends the contents of p to the buffer, growing the buffer as +// needed. The return value n is the length of p; err is always nil. If the +// buffer becomes too large, Write will panic with ErrTooLarge. +func (b *Buffer) Write(p []byte) (n int, err error) { + if b.skipTrailingByte { + p = p[:len(p)-1] + } + m := b.grow(len(p)) + return copy(b.buf[m:], p), nil +} + +// WriteString appends the contents of s to the buffer, growing the buffer as +// needed. The return value n is the length of s; err is always nil. If the +// buffer becomes too large, WriteString will panic with ErrTooLarge. +func (b *Buffer) WriteString(s string) (n int, err error) { + m := b.grow(len(s)) + return copy(b.buf[m:], s), nil +} + +// MinRead is the minimum slice size passed to a Read call by +// Buffer.ReadFrom. As long as the Buffer has at least MinRead bytes beyond +// what is required to hold the contents of r, ReadFrom will not grow the +// underlying buffer. +const minRead = 512 + +// ReadFrom reads data from r until EOF and appends it to the buffer, growing +// the buffer as needed. The return value n is the number of bytes read. Any +// error except io.EOF encountered during the read is also returned. If the +// buffer becomes too large, ReadFrom will panic with ErrTooLarge. +func (b *Buffer) ReadFrom(r io.Reader) (n int64, err error) { + // If buffer is empty, reset to recover space. + if b.off >= len(b.buf) { + b.Truncate(0) + } + for { + if free := cap(b.buf) - len(b.buf); free < minRead { + // not enough space at end + newBuf := b.buf + if b.off+free < minRead { + // not enough space using beginning of buffer; + // double buffer capacity + newBuf = makeSlice(2*cap(b.buf) + minRead) + } + copy(newBuf, b.buf[b.off:]) + Pool(b.buf) + b.buf = newBuf[:len(b.buf)-b.off] + b.off = 0 + } + m, e := r.Read(b.buf[len(b.buf):cap(b.buf)]) + b.buf = b.buf[0 : len(b.buf)+m] + n += int64(m) + if e == io.EOF { + break + } + if e != nil { + return n, e + } + } + return n, nil // err is EOF, so return nil explicitly +} + +// WriteTo writes data to w until the buffer is drained or an error occurs. +// The return value n is the number of bytes written; it always fits into an +// int, but it is int64 to match the io.WriterTo interface. Any error +// encountered during the write is also returned. +func (b *Buffer) WriteTo(w io.Writer) (n int64, err error) { + if b.off < len(b.buf) { + nBytes := b.Len() + m, e := w.Write(b.buf[b.off:]) + if m > nBytes { + panic("bytes.Buffer.WriteTo: invalid Write count") + } + b.off += m + n = int64(m) + if e != nil { + return n, e + } + // all bytes should have been written, by definition of + // Write method in io.Writer + if m != nBytes { + return n, io.ErrShortWrite + } + } + // Buffer is now empty; reset. + b.Truncate(0) + return +} + +// WriteByte appends the byte c to the buffer, growing the buffer as needed. +// The returned error is always nil, but is included to match bufio.Writer's +// WriteByte. If the buffer becomes too large, WriteByte will panic with +// ErrTooLarge. +func (b *Buffer) WriteByte(c byte) error { + m := b.grow(1) + b.buf[m] = c + return nil +} + +func (b *Buffer) Rewind(n int) error { + b.buf = b.buf[:len(b.buf)-n] + return nil +} + +func (b *Buffer) Encode(v interface{}) error { + if b.encoder == nil { + b.encoder = json.NewEncoder(b) + } + b.skipTrailingByte = true + err := b.encoder.Encode(v) + b.skipTrailingByte = false + return err +} + +// WriteRune appends the UTF-8 encoding of Unicode code point r to the +// buffer, returning its length and an error, which is always nil but is +// included to match bufio.Writer's WriteRune. The buffer is grown as needed; +// if it becomes too large, WriteRune will panic with ErrTooLarge. +func (b *Buffer) WriteRune(r rune) (n int, err error) { + if r < utf8.RuneSelf { + b.WriteByte(byte(r)) + return 1, nil + } + n = utf8.EncodeRune(b.runeBytes[0:], r) + b.Write(b.runeBytes[0:n]) + return n, nil +} + +// Read reads the next len(p) bytes from the buffer or until the buffer +// is drained. The return value n is the number of bytes read. If the +// buffer has no data to return, err is io.EOF (unless len(p) is zero); +// otherwise it is nil. +func (b *Buffer) Read(p []byte) (n int, err error) { + if b.off >= len(b.buf) { + // Buffer is empty, reset to recover space. + b.Truncate(0) + if len(p) == 0 { + return + } + return 0, io.EOF + } + n = copy(p, b.buf[b.off:]) + b.off += n + return +} + +// Next returns a slice containing the next n bytes from the buffer, +// advancing the buffer as if the bytes had been returned by Read. +// If there are fewer than n bytes in the buffer, Next returns the entire buffer. +// The slice is only valid until the next call to a read or write method. +func (b *Buffer) Next(n int) []byte { + m := b.Len() + if n > m { + n = m + } + data := b.buf[b.off : b.off+n] + b.off += n + return data +} + +// ReadByte reads and returns the next byte from the buffer. +// If no byte is available, it returns error io.EOF. +func (b *Buffer) ReadByte() (c byte, err error) { + if b.off >= len(b.buf) { + // Buffer is empty, reset to recover space. + b.Truncate(0) + return 0, io.EOF + } + c = b.buf[b.off] + b.off++ + return c, nil +} + +// ReadRune reads and returns the next UTF-8-encoded +// Unicode code point from the buffer. +// If no bytes are available, the error returned is io.EOF. +// If the bytes are an erroneous UTF-8 encoding, it +// consumes one byte and returns U+FFFD, 1. +func (b *Buffer) ReadRune() (r rune, size int, err error) { + if b.off >= len(b.buf) { + // Buffer is empty, reset to recover space. + b.Truncate(0) + return 0, 0, io.EOF + } + c := b.buf[b.off] + if c < utf8.RuneSelf { + b.off++ + return rune(c), 1, nil + } + r, n := utf8.DecodeRune(b.buf[b.off:]) + b.off += n + return r, n, nil +} + +// ReadBytes reads until the first occurrence of delim in the input, +// returning a slice containing the data up to and including the delimiter. +// If ReadBytes encounters an error before finding a delimiter, +// it returns the data read before the error and the error itself (often io.EOF). +// ReadBytes returns err != nil if and only if the returned data does not end in +// delim. +func (b *Buffer) ReadBytes(delim byte) (line []byte, err error) { + slice, err := b.readSlice(delim) + // return a copy of slice. The buffer's backing array may + // be overwritten by later calls. + line = append(line, slice...) + return +} + +// readSlice is like ReadBytes but returns a reference to internal buffer data. +func (b *Buffer) readSlice(delim byte) (line []byte, err error) { + i := bytes.IndexByte(b.buf[b.off:], delim) + end := b.off + i + 1 + if i < 0 { + end = len(b.buf) + err = io.EOF + } + line = b.buf[b.off:end] + b.off = end + return line, err +} + +// ReadString reads until the first occurrence of delim in the input, +// returning a string containing the data up to and including the delimiter. +// If ReadString encounters an error before finding a delimiter, +// it returns the data read before the error and the error itself (often io.EOF). +// ReadString returns err != nil if and only if the returned data does not end +// in delim. +func (b *Buffer) ReadString(delim byte) (line string, err error) { + slice, err := b.readSlice(delim) + return string(slice), err +} + +// NewBuffer creates and initializes a new Buffer using buf as its initial +// contents. It is intended to prepare a Buffer to read existing data. It +// can also be used to size the internal buffer for writing. To do that, +// buf should have the desired capacity but a length of zero. +// +// In most cases, new(Buffer) (or just declaring a Buffer variable) is +// sufficient to initialize a Buffer. +func NewBuffer(buf []byte) *Buffer { return &Buffer{buf: buf} } + +// NewBufferString creates and initializes a new Buffer using string s as its +// initial contents. It is intended to prepare a buffer to read an existing +// string. +// +// In most cases, new(Buffer) (or just declaring a Buffer variable) is +// sufficient to initialize a Buffer. +func NewBufferString(s string) *Buffer { + return &Buffer{buf: []byte(s)} +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_nopool.go b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_nopool.go new file mode 100644 index 000000000..b84af6ff9 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_nopool.go @@ -0,0 +1,11 @@ +// +build !go1.3 + +package v1 + +// Stub version of buffer_pool.go for Go 1.2, which doesn't have sync.Pool. + +func Pool(b []byte) {} + +func makeSlice(n int) []byte { + return make([]byte, n) +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go new file mode 100644 index 000000000..a021c57cf --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/buffer_pool.go @@ -0,0 +1,105 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build go1.3 + +package v1 + +// Allocation pools for Buffers. + +import "sync" + +var pools [14]sync.Pool +var pool64 *sync.Pool + +func init() { + var i uint + // TODO(pquerna): add science here around actual pool sizes. + for i = 6; i < 20; i++ { + n := 1 << i + pools[poolNum(n)].New = func() interface{} { return make([]byte, 0, n) } + } + pool64 = &pools[0] +} + +// This returns the pool number that will give a buffer of +// at least 'i' bytes. +func poolNum(i int) int { + // TODO(pquerna): convert to log2 w/ bsr asm instruction: + // <https://groups.google.com/forum/#!topic/golang-nuts/uAb5J1_y7ns> + if i <= 64 { + return 0 + } else if i <= 128 { + return 1 + } else if i <= 256 { + return 2 + } else if i <= 512 { + return 3 + } else if i <= 1024 { + return 4 + } else if i <= 2048 { + return 5 + } else if i <= 4096 { + return 6 + } else if i <= 8192 { + return 7 + } else if i <= 16384 { + return 8 + } else if i <= 32768 { + return 9 + } else if i <= 65536 { + return 10 + } else if i <= 131072 { + return 11 + } else if i <= 262144 { + return 12 + } else if i <= 524288 { + return 13 + } else { + return -1 + } +} + +// Send a buffer to the Pool to reuse for other instances. +// You may no longer utilize the content of the buffer, since it may be used +// by other goroutines. +func Pool(b []byte) { + if b == nil { + return + } + c := cap(b) + + // Our smallest buffer is 64 bytes, so we discard smaller buffers. + if c < 64 { + return + } + + // We need to put the incoming buffer into the NEXT buffer, + // since a buffer guarantees AT LEAST the number of bytes available + // that is the top of this buffer. + // That is the reason for dividing the cap by 2, so it gets into the NEXT bucket. + // We add 2 to avoid rounding down if size is exactly power of 2. + pn := poolNum((c + 2) >> 1) + if pn != -1 { + pools[pn].Put(b[0:0]) + } + // if we didn't have a slot for this []byte, we just drop it and let the GC + // take care of it. +} + +// makeSlice allocates a slice of size n -- it will attempt to use a pool'ed +// instance whenever possible. +func makeSlice(n int) []byte { + if n <= 64 { + return pool64.Get().([]byte)[0:n] + } + + pn := poolNum(n) + + if pn != -1 { + return pools[pn].Get().([]byte)[0:n] + } else { + return make([]byte, n) + } +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/bytenum.go b/vendor/github.com/pquerna/ffjson/fflib/v1/bytenum.go new file mode 100644 index 000000000..08477409a --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/bytenum.go @@ -0,0 +1,88 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's strconv/iota.go */ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +import ( + "github.com/pquerna/ffjson/fflib/v1/internal" +) + +func ParseFloat(s []byte, bitSize int) (f float64, err error) { + return internal.ParseFloat(s, bitSize) +} + +// ParseUint is like ParseInt but for unsigned numbers, and oeprating on []byte +func ParseUint(s []byte, base int, bitSize int) (n uint64, err error) { + if len(s) == 1 { + switch s[0] { + case '0': + return 0, nil + case '1': + return 1, nil + case '2': + return 2, nil + case '3': + return 3, nil + case '4': + return 4, nil + case '5': + return 5, nil + case '6': + return 6, nil + case '7': + return 7, nil + case '8': + return 8, nil + case '9': + return 9, nil + } + } + return internal.ParseUint(s, base, bitSize) +} + +func ParseInt(s []byte, base int, bitSize int) (i int64, err error) { + if len(s) == 1 { + switch s[0] { + case '0': + return 0, nil + case '1': + return 1, nil + case '2': + return 2, nil + case '3': + return 3, nil + case '4': + return 4, nil + case '5': + return 5, nil + case '6': + return 6, nil + case '7': + return 7, nil + case '8': + return 8, nil + case '9': + return 9, nil + } + } + return internal.ParseInt(s, base, bitSize) +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/decimal.go b/vendor/github.com/pquerna/ffjson/fflib/v1/decimal.go new file mode 100644 index 000000000..069df7a02 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/decimal.go @@ -0,0 +1,378 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Multiprecision decimal numbers. +// For floating-point formatting only; not general purpose. +// Only operations are assign and (binary) left/right shift. +// Can do binary floating point in multiprecision decimal precisely +// because 2 divides 10; cannot do decimal floating point +// in multiprecision binary precisely. + +package v1 + +type decimal struct { + d [800]byte // digits + nd int // number of digits used + dp int // decimal point + neg bool + trunc bool // discarded nonzero digits beyond d[:nd] +} + +func (a *decimal) String() string { + n := 10 + a.nd + if a.dp > 0 { + n += a.dp + } + if a.dp < 0 { + n += -a.dp + } + + buf := make([]byte, n) + w := 0 + switch { + case a.nd == 0: + return "0" + + case a.dp <= 0: + // zeros fill space between decimal point and digits + buf[w] = '0' + w++ + buf[w] = '.' + w++ + w += digitZero(buf[w : w+-a.dp]) + w += copy(buf[w:], a.d[0:a.nd]) + + case a.dp < a.nd: + // decimal point in middle of digits + w += copy(buf[w:], a.d[0:a.dp]) + buf[w] = '.' + w++ + w += copy(buf[w:], a.d[a.dp:a.nd]) + + default: + // zeros fill space between digits and decimal point + w += copy(buf[w:], a.d[0:a.nd]) + w += digitZero(buf[w : w+a.dp-a.nd]) + } + return string(buf[0:w]) +} + +func digitZero(dst []byte) int { + for i := range dst { + dst[i] = '0' + } + return len(dst) +} + +// trim trailing zeros from number. +// (They are meaningless; the decimal point is tracked +// independent of the number of digits.) +func trim(a *decimal) { + for a.nd > 0 && a.d[a.nd-1] == '0' { + a.nd-- + } + if a.nd == 0 { + a.dp = 0 + } +} + +// Assign v to a. +func (a *decimal) Assign(v uint64) { + var buf [24]byte + + // Write reversed decimal in buf. + n := 0 + for v > 0 { + v1 := v / 10 + v -= 10 * v1 + buf[n] = byte(v + '0') + n++ + v = v1 + } + + // Reverse again to produce forward decimal in a.d. + a.nd = 0 + for n--; n >= 0; n-- { + a.d[a.nd] = buf[n] + a.nd++ + } + a.dp = a.nd + trim(a) +} + +// Maximum shift that we can do in one pass without overflow. +// Signed int has 31 bits, and we have to be able to accommodate 9<<k. +const maxShift = 27 + +// Binary shift right (* 2) by k bits. k <= maxShift to avoid overflow. +func rightShift(a *decimal, k uint) { + r := 0 // read pointer + w := 0 // write pointer + + // Pick up enough leading digits to cover first shift. + n := 0 + for ; n>>k == 0; r++ { + if r >= a.nd { + if n == 0 { + // a == 0; shouldn't get here, but handle anyway. + a.nd = 0 + return + } + for n>>k == 0 { + n = n * 10 + r++ + } + break + } + c := int(a.d[r]) + n = n*10 + c - '0' + } + a.dp -= r - 1 + + // Pick up a digit, put down a digit. + for ; r < a.nd; r++ { + c := int(a.d[r]) + dig := n >> k + n -= dig << k + a.d[w] = byte(dig + '0') + w++ + n = n*10 + c - '0' + } + + // Put down extra digits. + for n > 0 { + dig := n >> k + n -= dig << k + if w < len(a.d) { + a.d[w] = byte(dig + '0') + w++ + } else if dig > 0 { + a.trunc = true + } + n = n * 10 + } + + a.nd = w + trim(a) +} + +// Cheat sheet for left shift: table indexed by shift count giving +// number of new digits that will be introduced by that shift. +// +// For example, leftcheats[4] = {2, "625"}. That means that +// if we are shifting by 4 (multiplying by 16), it will add 2 digits +// when the string prefix is "625" through "999", and one fewer digit +// if the string prefix is "000" through "624". +// +// Credit for this trick goes to Ken. + +type leftCheat struct { + delta int // number of new digits + cutoff string // minus one digit if original < a. +} + +var leftcheats = []leftCheat{ + // Leading digits of 1/2^i = 5^i. + // 5^23 is not an exact 64-bit floating point number, + // so have to use bc for the math. + /* + seq 27 | sed 's/^/5^/' | bc | + awk 'BEGIN{ print "\tleftCheat{ 0, \"\" }," } + { + log2 = log(2)/log(10) + printf("\tleftCheat{ %d, \"%s\" },\t// * %d\n", + int(log2*NR+1), $0, 2**NR) + }' + */ + {0, ""}, + {1, "5"}, // * 2 + {1, "25"}, // * 4 + {1, "125"}, // * 8 + {2, "625"}, // * 16 + {2, "3125"}, // * 32 + {2, "15625"}, // * 64 + {3, "78125"}, // * 128 + {3, "390625"}, // * 256 + {3, "1953125"}, // * 512 + {4, "9765625"}, // * 1024 + {4, "48828125"}, // * 2048 + {4, "244140625"}, // * 4096 + {4, "1220703125"}, // * 8192 + {5, "6103515625"}, // * 16384 + {5, "30517578125"}, // * 32768 + {5, "152587890625"}, // * 65536 + {6, "762939453125"}, // * 131072 + {6, "3814697265625"}, // * 262144 + {6, "19073486328125"}, // * 524288 + {7, "95367431640625"}, // * 1048576 + {7, "476837158203125"}, // * 2097152 + {7, "2384185791015625"}, // * 4194304 + {7, "11920928955078125"}, // * 8388608 + {8, "59604644775390625"}, // * 16777216 + {8, "298023223876953125"}, // * 33554432 + {8, "1490116119384765625"}, // * 67108864 + {9, "7450580596923828125"}, // * 134217728 +} + +// Is the leading prefix of b lexicographically less than s? +func prefixIsLessThan(b []byte, s string) bool { + for i := 0; i < len(s); i++ { + if i >= len(b) { + return true + } + if b[i] != s[i] { + return b[i] < s[i] + } + } + return false +} + +// Binary shift left (/ 2) by k bits. k <= maxShift to avoid overflow. +func leftShift(a *decimal, k uint) { + delta := leftcheats[k].delta + if prefixIsLessThan(a.d[0:a.nd], leftcheats[k].cutoff) { + delta-- + } + + r := a.nd // read index + w := a.nd + delta // write index + n := 0 + + // Pick up a digit, put down a digit. + for r--; r >= 0; r-- { + n += (int(a.d[r]) - '0') << k + quo := n / 10 + rem := n - 10*quo + w-- + if w < len(a.d) { + a.d[w] = byte(rem + '0') + } else if rem != 0 { + a.trunc = true + } + n = quo + } + + // Put down extra digits. + for n > 0 { + quo := n / 10 + rem := n - 10*quo + w-- + if w < len(a.d) { + a.d[w] = byte(rem + '0') + } else if rem != 0 { + a.trunc = true + } + n = quo + } + + a.nd += delta + if a.nd >= len(a.d) { + a.nd = len(a.d) + } + a.dp += delta + trim(a) +} + +// Binary shift left (k > 0) or right (k < 0). +func (a *decimal) Shift(k int) { + switch { + case a.nd == 0: + // nothing to do: a == 0 + case k > 0: + for k > maxShift { + leftShift(a, maxShift) + k -= maxShift + } + leftShift(a, uint(k)) + case k < 0: + for k < -maxShift { + rightShift(a, maxShift) + k += maxShift + } + rightShift(a, uint(-k)) + } +} + +// If we chop a at nd digits, should we round up? +func shouldRoundUp(a *decimal, nd int) bool { + if nd < 0 || nd >= a.nd { + return false + } + if a.d[nd] == '5' && nd+1 == a.nd { // exactly halfway - round to even + // if we truncated, a little higher than what's recorded - always round up + if a.trunc { + return true + } + return nd > 0 && (a.d[nd-1]-'0')%2 != 0 + } + // not halfway - digit tells all + return a.d[nd] >= '5' +} + +// Round a to nd digits (or fewer). +// If nd is zero, it means we're rounding +// just to the left of the digits, as in +// 0.09 -> 0.1. +func (a *decimal) Round(nd int) { + if nd < 0 || nd >= a.nd { + return + } + if shouldRoundUp(a, nd) { + a.RoundUp(nd) + } else { + a.RoundDown(nd) + } +} + +// Round a down to nd digits (or fewer). +func (a *decimal) RoundDown(nd int) { + if nd < 0 || nd >= a.nd { + return + } + a.nd = nd + trim(a) +} + +// Round a up to nd digits (or fewer). +func (a *decimal) RoundUp(nd int) { + if nd < 0 || nd >= a.nd { + return + } + + // round up + for i := nd - 1; i >= 0; i-- { + c := a.d[i] + if c < '9' { // can stop after this digit + a.d[i]++ + a.nd = i + 1 + return + } + } + + // Number is all 9s. + // Change to single 1 with adjusted decimal point. + a.d[0] = '1' + a.nd = 1 + a.dp++ +} + +// Extract integer part, rounded appropriately. +// No guarantees about overflow. +func (a *decimal) RoundedInteger() uint64 { + if a.dp > 20 { + return 0xFFFFFFFFFFFFFFFF + } + var i int + n := uint64(0) + for i = 0; i < a.dp && i < a.nd; i++ { + n = n*10 + uint64(a.d[i]-'0') + } + for ; i < a.dp; i++ { + n *= 10 + } + if shouldRoundUp(a, a.dp) { + n++ + } + return n +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/extfloat.go b/vendor/github.com/pquerna/ffjson/fflib/v1/extfloat.go new file mode 100644 index 000000000..508ddc6be --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/extfloat.go @@ -0,0 +1,668 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +// An extFloat represents an extended floating-point number, with more +// precision than a float64. It does not try to save bits: the +// number represented by the structure is mant*(2^exp), with a negative +// sign if neg is true. +type extFloat struct { + mant uint64 + exp int + neg bool +} + +// Powers of ten taken from double-conversion library. +// http://code.google.com/p/double-conversion/ +const ( + firstPowerOfTen = -348 + stepPowerOfTen = 8 +) + +var smallPowersOfTen = [...]extFloat{ + {1 << 63, -63, false}, // 1 + {0xa << 60, -60, false}, // 1e1 + {0x64 << 57, -57, false}, // 1e2 + {0x3e8 << 54, -54, false}, // 1e3 + {0x2710 << 50, -50, false}, // 1e4 + {0x186a0 << 47, -47, false}, // 1e5 + {0xf4240 << 44, -44, false}, // 1e6 + {0x989680 << 40, -40, false}, // 1e7 +} + +var powersOfTen = [...]extFloat{ + {0xfa8fd5a0081c0288, -1220, false}, // 10^-348 + {0xbaaee17fa23ebf76, -1193, false}, // 10^-340 + {0x8b16fb203055ac76, -1166, false}, // 10^-332 + {0xcf42894a5dce35ea, -1140, false}, // 10^-324 + {0x9a6bb0aa55653b2d, -1113, false}, // 10^-316 + {0xe61acf033d1a45df, -1087, false}, // 10^-308 + {0xab70fe17c79ac6ca, -1060, false}, // 10^-300 + {0xff77b1fcbebcdc4f, -1034, false}, // 10^-292 + {0xbe5691ef416bd60c, -1007, false}, // 10^-284 + {0x8dd01fad907ffc3c, -980, false}, // 10^-276 + {0xd3515c2831559a83, -954, false}, // 10^-268 + {0x9d71ac8fada6c9b5, -927, false}, // 10^-260 + {0xea9c227723ee8bcb, -901, false}, // 10^-252 + {0xaecc49914078536d, -874, false}, // 10^-244 + {0x823c12795db6ce57, -847, false}, // 10^-236 + {0xc21094364dfb5637, -821, false}, // 10^-228 + {0x9096ea6f3848984f, -794, false}, // 10^-220 + {0xd77485cb25823ac7, -768, false}, // 10^-212 + {0xa086cfcd97bf97f4, -741, false}, // 10^-204 + {0xef340a98172aace5, -715, false}, // 10^-196 + {0xb23867fb2a35b28e, -688, false}, // 10^-188 + {0x84c8d4dfd2c63f3b, -661, false}, // 10^-180 + {0xc5dd44271ad3cdba, -635, false}, // 10^-172 + {0x936b9fcebb25c996, -608, false}, // 10^-164 + {0xdbac6c247d62a584, -582, false}, // 10^-156 + {0xa3ab66580d5fdaf6, -555, false}, // 10^-148 + {0xf3e2f893dec3f126, -529, false}, // 10^-140 + {0xb5b5ada8aaff80b8, -502, false}, // 10^-132 + {0x87625f056c7c4a8b, -475, false}, // 10^-124 + {0xc9bcff6034c13053, -449, false}, // 10^-116 + {0x964e858c91ba2655, -422, false}, // 10^-108 + {0xdff9772470297ebd, -396, false}, // 10^-100 + {0xa6dfbd9fb8e5b88f, -369, false}, // 10^-92 + {0xf8a95fcf88747d94, -343, false}, // 10^-84 + {0xb94470938fa89bcf, -316, false}, // 10^-76 + {0x8a08f0f8bf0f156b, -289, false}, // 10^-68 + {0xcdb02555653131b6, -263, false}, // 10^-60 + {0x993fe2c6d07b7fac, -236, false}, // 10^-52 + {0xe45c10c42a2b3b06, -210, false}, // 10^-44 + {0xaa242499697392d3, -183, false}, // 10^-36 + {0xfd87b5f28300ca0e, -157, false}, // 10^-28 + {0xbce5086492111aeb, -130, false}, // 10^-20 + {0x8cbccc096f5088cc, -103, false}, // 10^-12 + {0xd1b71758e219652c, -77, false}, // 10^-4 + {0x9c40000000000000, -50, false}, // 10^4 + {0xe8d4a51000000000, -24, false}, // 10^12 + {0xad78ebc5ac620000, 3, false}, // 10^20 + {0x813f3978f8940984, 30, false}, // 10^28 + {0xc097ce7bc90715b3, 56, false}, // 10^36 + {0x8f7e32ce7bea5c70, 83, false}, // 10^44 + {0xd5d238a4abe98068, 109, false}, // 10^52 + {0x9f4f2726179a2245, 136, false}, // 10^60 + {0xed63a231d4c4fb27, 162, false}, // 10^68 + {0xb0de65388cc8ada8, 189, false}, // 10^76 + {0x83c7088e1aab65db, 216, false}, // 10^84 + {0xc45d1df942711d9a, 242, false}, // 10^92 + {0x924d692ca61be758, 269, false}, // 10^100 + {0xda01ee641a708dea, 295, false}, // 10^108 + {0xa26da3999aef774a, 322, false}, // 10^116 + {0xf209787bb47d6b85, 348, false}, // 10^124 + {0xb454e4a179dd1877, 375, false}, // 10^132 + {0x865b86925b9bc5c2, 402, false}, // 10^140 + {0xc83553c5c8965d3d, 428, false}, // 10^148 + {0x952ab45cfa97a0b3, 455, false}, // 10^156 + {0xde469fbd99a05fe3, 481, false}, // 10^164 + {0xa59bc234db398c25, 508, false}, // 10^172 + {0xf6c69a72a3989f5c, 534, false}, // 10^180 + {0xb7dcbf5354e9bece, 561, false}, // 10^188 + {0x88fcf317f22241e2, 588, false}, // 10^196 + {0xcc20ce9bd35c78a5, 614, false}, // 10^204 + {0x98165af37b2153df, 641, false}, // 10^212 + {0xe2a0b5dc971f303a, 667, false}, // 10^220 + {0xa8d9d1535ce3b396, 694, false}, // 10^228 + {0xfb9b7cd9a4a7443c, 720, false}, // 10^236 + {0xbb764c4ca7a44410, 747, false}, // 10^244 + {0x8bab8eefb6409c1a, 774, false}, // 10^252 + {0xd01fef10a657842c, 800, false}, // 10^260 + {0x9b10a4e5e9913129, 827, false}, // 10^268 + {0xe7109bfba19c0c9d, 853, false}, // 10^276 + {0xac2820d9623bf429, 880, false}, // 10^284 + {0x80444b5e7aa7cf85, 907, false}, // 10^292 + {0xbf21e44003acdd2d, 933, false}, // 10^300 + {0x8e679c2f5e44ff8f, 960, false}, // 10^308 + {0xd433179d9c8cb841, 986, false}, // 10^316 + {0x9e19db92b4e31ba9, 1013, false}, // 10^324 + {0xeb96bf6ebadf77d9, 1039, false}, // 10^332 + {0xaf87023b9bf0ee6b, 1066, false}, // 10^340 +} + +// floatBits returns the bits of the float64 that best approximates +// the extFloat passed as receiver. Overflow is set to true if +// the resulting float64 is ±Inf. +func (f *extFloat) floatBits(flt *floatInfo) (bits uint64, overflow bool) { + f.Normalize() + + exp := f.exp + 63 + + // Exponent too small. + if exp < flt.bias+1 { + n := flt.bias + 1 - exp + f.mant >>= uint(n) + exp += n + } + + // Extract 1+flt.mantbits bits from the 64-bit mantissa. + mant := f.mant >> (63 - flt.mantbits) + if f.mant&(1<<(62-flt.mantbits)) != 0 { + // Round up. + mant += 1 + } + + // Rounding might have added a bit; shift down. + if mant == 2<<flt.mantbits { + mant >>= 1 + exp++ + } + + // Infinities. + if exp-flt.bias >= 1<<flt.expbits-1 { + // ±Inf + mant = 0 + exp = 1<<flt.expbits - 1 + flt.bias + overflow = true + } else if mant&(1<<flt.mantbits) == 0 { + // Denormalized? + exp = flt.bias + } + // Assemble bits. + bits = mant & (uint64(1)<<flt.mantbits - 1) + bits |= uint64((exp-flt.bias)&(1<<flt.expbits-1)) << flt.mantbits + if f.neg { + bits |= 1 << (flt.mantbits + flt.expbits) + } + return +} + +// AssignComputeBounds sets f to the floating point value +// defined by mant, exp and precision given by flt. It returns +// lower, upper such that any number in the closed interval +// [lower, upper] is converted back to the same floating point number. +func (f *extFloat) AssignComputeBounds(mant uint64, exp int, neg bool, flt *floatInfo) (lower, upper extFloat) { + f.mant = mant + f.exp = exp - int(flt.mantbits) + f.neg = neg + if f.exp <= 0 && mant == (mant>>uint(-f.exp))<<uint(-f.exp) { + // An exact integer + f.mant >>= uint(-f.exp) + f.exp = 0 + return *f, *f + } + expBiased := exp - flt.bias + + upper = extFloat{mant: 2*f.mant + 1, exp: f.exp - 1, neg: f.neg} + if mant != 1<<flt.mantbits || expBiased == 1 { + lower = extFloat{mant: 2*f.mant - 1, exp: f.exp - 1, neg: f.neg} + } else { + lower = extFloat{mant: 4*f.mant - 1, exp: f.exp - 2, neg: f.neg} + } + return +} + +// Normalize normalizes f so that the highest bit of the mantissa is +// set, and returns the number by which the mantissa was left-shifted. +func (f *extFloat) Normalize() (shift uint) { + mant, exp := f.mant, f.exp + if mant == 0 { + return 0 + } + if mant>>(64-32) == 0 { + mant <<= 32 + exp -= 32 + } + if mant>>(64-16) == 0 { + mant <<= 16 + exp -= 16 + } + if mant>>(64-8) == 0 { + mant <<= 8 + exp -= 8 + } + if mant>>(64-4) == 0 { + mant <<= 4 + exp -= 4 + } + if mant>>(64-2) == 0 { + mant <<= 2 + exp -= 2 + } + if mant>>(64-1) == 0 { + mant <<= 1 + exp -= 1 + } + shift = uint(f.exp - exp) + f.mant, f.exp = mant, exp + return +} + +// Multiply sets f to the product f*g: the result is correctly rounded, +// but not normalized. +func (f *extFloat) Multiply(g extFloat) { + fhi, flo := f.mant>>32, uint64(uint32(f.mant)) + ghi, glo := g.mant>>32, uint64(uint32(g.mant)) + + // Cross products. + cross1 := fhi * glo + cross2 := flo * ghi + + // f.mant*g.mant is fhi*ghi << 64 + (cross1+cross2) << 32 + flo*glo + f.mant = fhi*ghi + (cross1 >> 32) + (cross2 >> 32) + rem := uint64(uint32(cross1)) + uint64(uint32(cross2)) + ((flo * glo) >> 32) + // Round up. + rem += (1 << 31) + + f.mant += (rem >> 32) + f.exp = f.exp + g.exp + 64 +} + +var uint64pow10 = [...]uint64{ + 1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, + 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, +} + +// AssignDecimal sets f to an approximate value mantissa*10^exp. It +// returns true if the value represented by f is guaranteed to be the +// best approximation of d after being rounded to a float64 or +// float32 depending on flt. +func (f *extFloat) AssignDecimal(mantissa uint64, exp10 int, neg bool, trunc bool, flt *floatInfo) (ok bool) { + const uint64digits = 19 + const errorscale = 8 + errors := 0 // An upper bound for error, computed in errorscale*ulp. + if trunc { + // the decimal number was truncated. + errors += errorscale / 2 + } + + f.mant = mantissa + f.exp = 0 + f.neg = neg + + // Multiply by powers of ten. + i := (exp10 - firstPowerOfTen) / stepPowerOfTen + if exp10 < firstPowerOfTen || i >= len(powersOfTen) { + return false + } + adjExp := (exp10 - firstPowerOfTen) % stepPowerOfTen + + // We multiply by exp%step + if adjExp < uint64digits && mantissa < uint64pow10[uint64digits-adjExp] { + // We can multiply the mantissa exactly. + f.mant *= uint64pow10[adjExp] + f.Normalize() + } else { + f.Normalize() + f.Multiply(smallPowersOfTen[adjExp]) + errors += errorscale / 2 + } + + // We multiply by 10 to the exp - exp%step. + f.Multiply(powersOfTen[i]) + if errors > 0 { + errors += 1 + } + errors += errorscale / 2 + + // Normalize + shift := f.Normalize() + errors <<= shift + + // Now f is a good approximation of the decimal. + // Check whether the error is too large: that is, if the mantissa + // is perturbated by the error, the resulting float64 will change. + // The 64 bits mantissa is 1 + 52 bits for float64 + 11 extra bits. + // + // In many cases the approximation will be good enough. + denormalExp := flt.bias - 63 + var extrabits uint + if f.exp <= denormalExp { + // f.mant * 2^f.exp is smaller than 2^(flt.bias+1). + extrabits = uint(63 - flt.mantbits + 1 + uint(denormalExp-f.exp)) + } else { + extrabits = uint(63 - flt.mantbits) + } + + halfway := uint64(1) << (extrabits - 1) + mant_extra := f.mant & (1<<extrabits - 1) + + // Do a signed comparison here! If the error estimate could make + // the mantissa round differently for the conversion to double, + // then we can't give a definite answer. + if int64(halfway)-int64(errors) < int64(mant_extra) && + int64(mant_extra) < int64(halfway)+int64(errors) { + return false + } + return true +} + +// Frexp10 is an analogue of math.Frexp for decimal powers. It scales +// f by an approximate power of ten 10^-exp, and returns exp10, so +// that f*10^exp10 has the same value as the old f, up to an ulp, +// as well as the index of 10^-exp in the powersOfTen table. +func (f *extFloat) frexp10() (exp10, index int) { + // The constants expMin and expMax constrain the final value of the + // binary exponent of f. We want a small integral part in the result + // because finding digits of an integer requires divisions, whereas + // digits of the fractional part can be found by repeatedly multiplying + // by 10. + const expMin = -60 + const expMax = -32 + // Find power of ten such that x * 10^n has a binary exponent + // between expMin and expMax. + approxExp10 := ((expMin+expMax)/2 - f.exp) * 28 / 93 // log(10)/log(2) is close to 93/28. + i := (approxExp10 - firstPowerOfTen) / stepPowerOfTen +Loop: + for { + exp := f.exp + powersOfTen[i].exp + 64 + switch { + case exp < expMin: + i++ + case exp > expMax: + i-- + default: + break Loop + } + } + // Apply the desired decimal shift on f. It will have exponent + // in the desired range. This is multiplication by 10^-exp10. + f.Multiply(powersOfTen[i]) + + return -(firstPowerOfTen + i*stepPowerOfTen), i +} + +// frexp10Many applies a common shift by a power of ten to a, b, c. +func frexp10Many(a, b, c *extFloat) (exp10 int) { + exp10, i := c.frexp10() + a.Multiply(powersOfTen[i]) + b.Multiply(powersOfTen[i]) + return +} + +// FixedDecimal stores in d the first n significant digits +// of the decimal representation of f. It returns false +// if it cannot be sure of the answer. +func (f *extFloat) FixedDecimal(d *decimalSlice, n int) bool { + if f.mant == 0 { + d.nd = 0 + d.dp = 0 + d.neg = f.neg + return true + } + if n == 0 { + panic("strconv: internal error: extFloat.FixedDecimal called with n == 0") + } + // Multiply by an appropriate power of ten to have a reasonable + // number to process. + f.Normalize() + exp10, _ := f.frexp10() + + shift := uint(-f.exp) + integer := uint32(f.mant >> shift) + fraction := f.mant - (uint64(integer) << shift) + ε := uint64(1) // ε is the uncertainty we have on the mantissa of f. + + // Write exactly n digits to d. + needed := n // how many digits are left to write. + integerDigits := 0 // the number of decimal digits of integer. + pow10 := uint64(1) // the power of ten by which f was scaled. + for i, pow := 0, uint64(1); i < 20; i++ { + if pow > uint64(integer) { + integerDigits = i + break + } + pow *= 10 + } + rest := integer + if integerDigits > needed { + // the integral part is already large, trim the last digits. + pow10 = uint64pow10[integerDigits-needed] + integer /= uint32(pow10) + rest -= integer * uint32(pow10) + } else { + rest = 0 + } + + // Write the digits of integer: the digits of rest are omitted. + var buf [32]byte + pos := len(buf) + for v := integer; v > 0; { + v1 := v / 10 + v -= 10 * v1 + pos-- + buf[pos] = byte(v + '0') + v = v1 + } + for i := pos; i < len(buf); i++ { + d.d[i-pos] = buf[i] + } + nd := len(buf) - pos + d.nd = nd + d.dp = integerDigits + exp10 + needed -= nd + + if needed > 0 { + if rest != 0 || pow10 != 1 { + panic("strconv: internal error, rest != 0 but needed > 0") + } + // Emit digits for the fractional part. Each time, 10*fraction + // fits in a uint64 without overflow. + for needed > 0 { + fraction *= 10 + ε *= 10 // the uncertainty scales as we multiply by ten. + if 2*ε > 1<<shift { + // the error is so large it could modify which digit to write, abort. + return false + } + digit := fraction >> shift + d.d[nd] = byte(digit + '0') + fraction -= digit << shift + nd++ + needed-- + } + d.nd = nd + } + + // We have written a truncation of f (a numerator / 10^d.dp). The remaining part + // can be interpreted as a small number (< 1) to be added to the last digit of the + // numerator. + // + // If rest > 0, the amount is: + // (rest<<shift | fraction) / (pow10 << shift) + // fraction being known with a ±ε uncertainty. + // The fact that n > 0 guarantees that pow10 << shift does not overflow a uint64. + // + // If rest = 0, pow10 == 1 and the amount is + // fraction / (1 << shift) + // fraction being known with a ±ε uncertainty. + // + // We pass this information to the rounding routine for adjustment. + + ok := adjustLastDigitFixed(d, uint64(rest)<<shift|fraction, pow10, shift, ε) + if !ok { + return false + } + // Trim trailing zeros. + for i := d.nd - 1; i >= 0; i-- { + if d.d[i] != '0' { + d.nd = i + 1 + break + } + } + return true +} + +// adjustLastDigitFixed assumes d contains the representation of the integral part +// of some number, whose fractional part is num / (den << shift). The numerator +// num is only known up to an uncertainty of size ε, assumed to be less than +// (den << shift)/2. +// +// It will increase the last digit by one to account for correct rounding, typically +// when the fractional part is greater than 1/2, and will return false if ε is such +// that no correct answer can be given. +func adjustLastDigitFixed(d *decimalSlice, num, den uint64, shift uint, ε uint64) bool { + if num > den<<shift { + panic("strconv: num > den<<shift in adjustLastDigitFixed") + } + if 2*ε > den<<shift { + panic("strconv: ε > (den<<shift)/2") + } + if 2*(num+ε) < den<<shift { + return true + } + if 2*(num-ε) > den<<shift { + // increment d by 1. + i := d.nd - 1 + for ; i >= 0; i-- { + if d.d[i] == '9' { + d.nd-- + } else { + break + } + } + if i < 0 { + d.d[0] = '1' + d.nd = 1 + d.dp++ + } else { + d.d[i]++ + } + return true + } + return false +} + +// ShortestDecimal stores in d the shortest decimal representation of f +// which belongs to the open interval (lower, upper), where f is supposed +// to lie. It returns false whenever the result is unsure. The implementation +// uses the Grisu3 algorithm. +func (f *extFloat) ShortestDecimal(d *decimalSlice, lower, upper *extFloat) bool { + if f.mant == 0 { + d.nd = 0 + d.dp = 0 + d.neg = f.neg + return true + } + if f.exp == 0 && *lower == *f && *lower == *upper { + // an exact integer. + var buf [24]byte + n := len(buf) - 1 + for v := f.mant; v > 0; { + v1 := v / 10 + v -= 10 * v1 + buf[n] = byte(v + '0') + n-- + v = v1 + } + nd := len(buf) - n - 1 + for i := 0; i < nd; i++ { + d.d[i] = buf[n+1+i] + } + d.nd, d.dp = nd, nd + for d.nd > 0 && d.d[d.nd-1] == '0' { + d.nd-- + } + if d.nd == 0 { + d.dp = 0 + } + d.neg = f.neg + return true + } + upper.Normalize() + // Uniformize exponents. + if f.exp > upper.exp { + f.mant <<= uint(f.exp - upper.exp) + f.exp = upper.exp + } + if lower.exp > upper.exp { + lower.mant <<= uint(lower.exp - upper.exp) + lower.exp = upper.exp + } + + exp10 := frexp10Many(lower, f, upper) + // Take a safety margin due to rounding in frexp10Many, but we lose precision. + upper.mant++ + lower.mant-- + + // The shortest representation of f is either rounded up or down, but + // in any case, it is a truncation of upper. + shift := uint(-upper.exp) + integer := uint32(upper.mant >> shift) + fraction := upper.mant - (uint64(integer) << shift) + + // How far we can go down from upper until the result is wrong. + allowance := upper.mant - lower.mant + // How far we should go to get a very precise result. + targetDiff := upper.mant - f.mant + + // Count integral digits: there are at most 10. + var integerDigits int + for i, pow := 0, uint64(1); i < 20; i++ { + if pow > uint64(integer) { + integerDigits = i + break + } + pow *= 10 + } + for i := 0; i < integerDigits; i++ { + pow := uint64pow10[integerDigits-i-1] + digit := integer / uint32(pow) + d.d[i] = byte(digit + '0') + integer -= digit * uint32(pow) + // evaluate whether we should stop. + if currentDiff := uint64(integer)<<shift + fraction; currentDiff < allowance { + d.nd = i + 1 + d.dp = integerDigits + exp10 + d.neg = f.neg + // Sometimes allowance is so large the last digit might need to be + // decremented to get closer to f. + return adjustLastDigit(d, currentDiff, targetDiff, allowance, pow<<shift, 2) + } + } + d.nd = integerDigits + d.dp = d.nd + exp10 + d.neg = f.neg + + // Compute digits of the fractional part. At each step fraction does not + // overflow. The choice of minExp implies that fraction is less than 2^60. + var digit int + multiplier := uint64(1) + for { + fraction *= 10 + multiplier *= 10 + digit = int(fraction >> shift) + d.d[d.nd] = byte(digit + '0') + d.nd++ + fraction -= uint64(digit) << shift + if fraction < allowance*multiplier { + // We are in the admissible range. Note that if allowance is about to + // overflow, that is, allowance > 2^64/10, the condition is automatically + // true due to the limited range of fraction. + return adjustLastDigit(d, + fraction, targetDiff*multiplier, allowance*multiplier, + 1<<shift, multiplier*2) + } + } +} + +// adjustLastDigit modifies d = x-currentDiff*ε, to get closest to +// d = x-targetDiff*ε, without becoming smaller than x-maxDiff*ε. +// It assumes that a decimal digit is worth ulpDecimal*ε, and that +// all data is known with a error estimate of ulpBinary*ε. +func adjustLastDigit(d *decimalSlice, currentDiff, targetDiff, maxDiff, ulpDecimal, ulpBinary uint64) bool { + if ulpDecimal < 2*ulpBinary { + // Approximation is too wide. + return false + } + for currentDiff+ulpDecimal/2+ulpBinary < targetDiff { + d.d[d.nd-1]-- + currentDiff += ulpDecimal + } + if currentDiff+ulpDecimal <= targetDiff+ulpDecimal/2+ulpBinary { + // we have two choices, and don't know what to do. + return false + } + if currentDiff < ulpBinary || currentDiff > maxDiff-ulpBinary { + // we went too far + return false + } + if d.nd == 1 && d.d[0] == '0' { + // the number has actually reached zero. + d.nd = 0 + d.dp = 0 + } + return true +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/fold.go b/vendor/github.com/pquerna/ffjson/fflib/v1/fold.go new file mode 100644 index 000000000..4d33e6f77 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/fold.go @@ -0,0 +1,121 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's encoding/json/fold.go */ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +import ( + "unicode/utf8" +) + +const ( + caseMask = ^byte(0x20) // Mask to ignore case in ASCII. + kelvin = '\u212a' + smallLongEss = '\u017f' +) + +// equalFoldRight is a specialization of bytes.EqualFold when s is +// known to be all ASCII (including punctuation), but contains an 's', +// 'S', 'k', or 'K', requiring a Unicode fold on the bytes in t. +// See comments on foldFunc. +func EqualFoldRight(s, t []byte) bool { + for _, sb := range s { + if len(t) == 0 { + return false + } + tb := t[0] + if tb < utf8.RuneSelf { + if sb != tb { + sbUpper := sb & caseMask + if 'A' <= sbUpper && sbUpper <= 'Z' { + if sbUpper != tb&caseMask { + return false + } + } else { + return false + } + } + t = t[1:] + continue + } + // sb is ASCII and t is not. t must be either kelvin + // sign or long s; sb must be s, S, k, or K. + tr, size := utf8.DecodeRune(t) + switch sb { + case 's', 'S': + if tr != smallLongEss { + return false + } + case 'k', 'K': + if tr != kelvin { + return false + } + default: + return false + } + t = t[size:] + + } + if len(t) > 0 { + return false + } + return true +} + +// asciiEqualFold is a specialization of bytes.EqualFold for use when +// s is all ASCII (but may contain non-letters) and contains no +// special-folding letters. +// See comments on foldFunc. +func AsciiEqualFold(s, t []byte) bool { + if len(s) != len(t) { + return false + } + for i, sb := range s { + tb := t[i] + if sb == tb { + continue + } + if ('a' <= sb && sb <= 'z') || ('A' <= sb && sb <= 'Z') { + if sb&caseMask != tb&caseMask { + return false + } + } else { + return false + } + } + return true +} + +// simpleLetterEqualFold is a specialization of bytes.EqualFold for +// use when s is all ASCII letters (no underscores, etc) and also +// doesn't contain 'k', 'K', 's', or 'S'. +// See comments on foldFunc. +func SimpleLetterEqualFold(s, t []byte) bool { + if len(s) != len(t) { + return false + } + for i, b := range s { + if b&caseMask != t[i]&caseMask { + return false + } + } + return true +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/ftoa.go b/vendor/github.com/pquerna/ffjson/fflib/v1/ftoa.go new file mode 100644 index 000000000..360d6dbcf --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/ftoa.go @@ -0,0 +1,542 @@ +package v1 + +/** + * Copyright 2015 Paul Querna, Klaus Post + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Most of this file are on Go stdlib's strconv/ftoa.go */ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +import "math" + +// TODO: move elsewhere? +type floatInfo struct { + mantbits uint + expbits uint + bias int +} + +var optimize = true // can change for testing + +var float32info = floatInfo{23, 8, -127} +var float64info = floatInfo{52, 11, -1023} + +// AppendFloat appends the string form of the floating-point number f, +// as generated by FormatFloat +func AppendFloat(dst EncodingBuffer, val float64, fmt byte, prec, bitSize int) { + var bits uint64 + var flt *floatInfo + switch bitSize { + case 32: + bits = uint64(math.Float32bits(float32(val))) + flt = &float32info + case 64: + bits = math.Float64bits(val) + flt = &float64info + default: + panic("strconv: illegal AppendFloat/FormatFloat bitSize") + } + + neg := bits>>(flt.expbits+flt.mantbits) != 0 + exp := int(bits>>flt.mantbits) & (1<<flt.expbits - 1) + mant := bits & (uint64(1)<<flt.mantbits - 1) + + switch exp { + case 1<<flt.expbits - 1: + // Inf, NaN + var s string + switch { + case mant != 0: + s = "NaN" + case neg: + s = "-Inf" + default: + s = "+Inf" + } + dst.WriteString(s) + return + + case 0: + // denormalized + exp++ + + default: + // add implicit top bit + mant |= uint64(1) << flt.mantbits + } + exp += flt.bias + + // Pick off easy binary format. + if fmt == 'b' { + fmtB(dst, neg, mant, exp, flt) + return + } + + if !optimize { + bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + return + } + + var digs decimalSlice + ok := false + // Negative precision means "only as much as needed to be exact." + shortest := prec < 0 + if shortest { + // Try Grisu3 algorithm. + f := new(extFloat) + lower, upper := f.AssignComputeBounds(mant, exp, neg, flt) + var buf [32]byte + digs.d = buf[:] + ok = f.ShortestDecimal(&digs, &lower, &upper) + if !ok { + bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + return + } + // Precision for shortest representation mode. + switch fmt { + case 'e', 'E': + prec = max(digs.nd-1, 0) + case 'f': + prec = max(digs.nd-digs.dp, 0) + case 'g', 'G': + prec = digs.nd + } + } else if fmt != 'f' { + // Fixed number of digits. + digits := prec + switch fmt { + case 'e', 'E': + digits++ + case 'g', 'G': + if prec == 0 { + prec = 1 + } + digits = prec + } + if digits <= 15 { + // try fast algorithm when the number of digits is reasonable. + var buf [24]byte + digs.d = buf[:] + f := extFloat{mant, exp - int(flt.mantbits), neg} + ok = f.FixedDecimal(&digs, digits) + } + } + if !ok { + bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + return + } + formatDigits(dst, shortest, neg, digs, prec, fmt) + return +} + +// bigFtoa uses multiprecision computations to format a float. +func bigFtoa(dst EncodingBuffer, prec int, fmt byte, neg bool, mant uint64, exp int, flt *floatInfo) { + d := new(decimal) + d.Assign(mant) + d.Shift(exp - int(flt.mantbits)) + var digs decimalSlice + shortest := prec < 0 + if shortest { + roundShortest(d, mant, exp, flt) + digs = decimalSlice{d: d.d[:], nd: d.nd, dp: d.dp} + // Precision for shortest representation mode. + switch fmt { + case 'e', 'E': + prec = digs.nd - 1 + case 'f': + prec = max(digs.nd-digs.dp, 0) + case 'g', 'G': + prec = digs.nd + } + } else { + // Round appropriately. + switch fmt { + case 'e', 'E': + d.Round(prec + 1) + case 'f': + d.Round(d.dp + prec) + case 'g', 'G': + if prec == 0 { + prec = 1 + } + d.Round(prec) + } + digs = decimalSlice{d: d.d[:], nd: d.nd, dp: d.dp} + } + formatDigits(dst, shortest, neg, digs, prec, fmt) + return +} + +func formatDigits(dst EncodingBuffer, shortest bool, neg bool, digs decimalSlice, prec int, fmt byte) { + switch fmt { + case 'e', 'E': + fmtE(dst, neg, digs, prec, fmt) + return + case 'f': + fmtF(dst, neg, digs, prec) + return + case 'g', 'G': + // trailing fractional zeros in 'e' form will be trimmed. + eprec := prec + if eprec > digs.nd && digs.nd >= digs.dp { + eprec = digs.nd + } + // %e is used if the exponent from the conversion + // is less than -4 or greater than or equal to the precision. + // if precision was the shortest possible, use precision 6 for this decision. + if shortest { + eprec = 6 + } + exp := digs.dp - 1 + if exp < -4 || exp >= eprec { + if prec > digs.nd { + prec = digs.nd + } + fmtE(dst, neg, digs, prec-1, fmt+'e'-'g') + return + } + if prec > digs.dp { + prec = digs.nd + } + fmtF(dst, neg, digs, max(prec-digs.dp, 0)) + return + } + + // unknown format + dst.Write([]byte{'%', fmt}) + return +} + +// Round d (= mant * 2^exp) to the shortest number of digits +// that will let the original floating point value be precisely +// reconstructed. Size is original floating point size (64 or 32). +func roundShortest(d *decimal, mant uint64, exp int, flt *floatInfo) { + // If mantissa is zero, the number is zero; stop now. + if mant == 0 { + d.nd = 0 + return + } + + // Compute upper and lower such that any decimal number + // between upper and lower (possibly inclusive) + // will round to the original floating point number. + + // We may see at once that the number is already shortest. + // + // Suppose d is not denormal, so that 2^exp <= d < 10^dp. + // The closest shorter number is at least 10^(dp-nd) away. + // The lower/upper bounds computed below are at distance + // at most 2^(exp-mantbits). + // + // So the number is already shortest if 10^(dp-nd) > 2^(exp-mantbits), + // or equivalently log2(10)*(dp-nd) > exp-mantbits. + // It is true if 332/100*(dp-nd) >= exp-mantbits (log2(10) > 3.32). + minexp := flt.bias + 1 // minimum possible exponent + if exp > minexp && 332*(d.dp-d.nd) >= 100*(exp-int(flt.mantbits)) { + // The number is already shortest. + return + } + + // d = mant << (exp - mantbits) + // Next highest floating point number is mant+1 << exp-mantbits. + // Our upper bound is halfway between, mant*2+1 << exp-mantbits-1. + upper := new(decimal) + upper.Assign(mant*2 + 1) + upper.Shift(exp - int(flt.mantbits) - 1) + + // d = mant << (exp - mantbits) + // Next lowest floating point number is mant-1 << exp-mantbits, + // unless mant-1 drops the significant bit and exp is not the minimum exp, + // in which case the next lowest is mant*2-1 << exp-mantbits-1. + // Either way, call it mantlo << explo-mantbits. + // Our lower bound is halfway between, mantlo*2+1 << explo-mantbits-1. + var mantlo uint64 + var explo int + if mant > 1<<flt.mantbits || exp == minexp { + mantlo = mant - 1 + explo = exp + } else { + mantlo = mant*2 - 1 + explo = exp - 1 + } + lower := new(decimal) + lower.Assign(mantlo*2 + 1) + lower.Shift(explo - int(flt.mantbits) - 1) + + // The upper and lower bounds are possible outputs only if + // the original mantissa is even, so that IEEE round-to-even + // would round to the original mantissa and not the neighbors. + inclusive := mant%2 == 0 + + // Now we can figure out the minimum number of digits required. + // Walk along until d has distinguished itself from upper and lower. + for i := 0; i < d.nd; i++ { + var l, m, u byte // lower, middle, upper digits + if i < lower.nd { + l = lower.d[i] + } else { + l = '0' + } + m = d.d[i] + if i < upper.nd { + u = upper.d[i] + } else { + u = '0' + } + + // Okay to round down (truncate) if lower has a different digit + // or if lower is inclusive and is exactly the result of rounding down. + okdown := l != m || (inclusive && l == m && i+1 == lower.nd) + + // Okay to round up if upper has a different digit and + // either upper is inclusive or upper is bigger than the result of rounding up. + okup := m != u && (inclusive || m+1 < u || i+1 < upper.nd) + + // If it's okay to do either, then round to the nearest one. + // If it's okay to do only one, do it. + switch { + case okdown && okup: + d.Round(i + 1) + return + case okdown: + d.RoundDown(i + 1) + return + case okup: + d.RoundUp(i + 1) + return + } + } +} + +type decimalSlice struct { + d []byte + nd, dp int + neg bool +} + +// %e: -d.ddddde±dd +func fmtE(dst EncodingBuffer, neg bool, d decimalSlice, prec int, fmt byte) { + // sign + if neg { + dst.WriteByte('-') + } + + // first digit + ch := byte('0') + if d.nd != 0 { + ch = d.d[0] + } + dst.WriteByte(ch) + + // .moredigits + if prec > 0 { + dst.WriteByte('.') + i := 1 + m := min(d.nd, prec+1) + if i < m { + dst.Write(d.d[i:m]) + i = m + } + for i <= prec { + dst.WriteByte('0') + i++ + } + } + + // e± + dst.WriteByte(fmt) + exp := d.dp - 1 + if d.nd == 0 { // special case: 0 has exponent 0 + exp = 0 + } + if exp < 0 { + ch = '-' + exp = -exp + } else { + ch = '+' + } + dst.WriteByte(ch) + + // dd or ddd + switch { + case exp < 10: + dst.WriteByte('0') + dst.WriteByte(byte(exp) + '0') + case exp < 100: + dst.WriteByte(byte(exp/10) + '0') + dst.WriteByte(byte(exp%10) + '0') + default: + dst.WriteByte(byte(exp/100) + '0') + dst.WriteByte(byte(exp/10)%10 + '0') + dst.WriteByte(byte(exp%10) + '0') + } + + return +} + +// %f: -ddddddd.ddddd +func fmtF(dst EncodingBuffer, neg bool, d decimalSlice, prec int) { + // sign + if neg { + dst.WriteByte('-') + } + + // integer, padded with zeros as needed. + if d.dp > 0 { + m := min(d.nd, d.dp) + dst.Write(d.d[:m]) + for ; m < d.dp; m++ { + dst.WriteByte('0') + } + } else { + dst.WriteByte('0') + } + + // fraction + if prec > 0 { + dst.WriteByte('.') + for i := 0; i < prec; i++ { + ch := byte('0') + if j := d.dp + i; 0 <= j && j < d.nd { + ch = d.d[j] + } + dst.WriteByte(ch) + } + } + + return +} + +// %b: -ddddddddp±ddd +func fmtB(dst EncodingBuffer, neg bool, mant uint64, exp int, flt *floatInfo) { + // sign + if neg { + dst.WriteByte('-') + } + + // mantissa + formatBits(dst, mant, 10, false) + + // p + dst.WriteByte('p') + + // ±exponent + exp -= int(flt.mantbits) + if exp >= 0 { + dst.WriteByte('+') + } + formatBits(dst, uint64(exp), 10, exp < 0) + + return +} + +func min(a, b int) int { + if a < b { + return a + } + return b +} + +func max(a, b int) int { + if a > b { + return a + } + return b +} + +// formatBits computes the string representation of u in the given base. +// If neg is set, u is treated as negative int64 value. +func formatBits(dst EncodingBuffer, u uint64, base int, neg bool) { + if base < 2 || base > len(digits) { + panic("strconv: illegal AppendInt/FormatInt base") + } + // 2 <= base && base <= len(digits) + + var a [64 + 1]byte // +1 for sign of 64bit value in base 2 + i := len(a) + + if neg { + u = -u + } + + // convert bits + if base == 10 { + // common case: use constants for / because + // the compiler can optimize it into a multiply+shift + + if ^uintptr(0)>>32 == 0 { + for u > uint64(^uintptr(0)) { + q := u / 1e9 + us := uintptr(u - q*1e9) // us % 1e9 fits into a uintptr + for j := 9; j > 0; j-- { + i-- + qs := us / 10 + a[i] = byte(us - qs*10 + '0') + us = qs + } + u = q + } + } + + // u guaranteed to fit into a uintptr + us := uintptr(u) + for us >= 10 { + i-- + q := us / 10 + a[i] = byte(us - q*10 + '0') + us = q + } + // u < 10 + i-- + a[i] = byte(us + '0') + + } else if s := shifts[base]; s > 0 { + // base is power of 2: use shifts and masks instead of / and % + b := uint64(base) + m := uintptr(b) - 1 // == 1<<s - 1 + for u >= b { + i-- + a[i] = digits[uintptr(u)&m] + u >>= s + } + // u < base + i-- + a[i] = digits[uintptr(u)] + + } else { + // general case + b := uint64(base) + for u >= b { + i-- + q := u / b + a[i] = digits[uintptr(u-q*b)] + u = q + } + // u < base + i-- + a[i] = digits[uintptr(u)] + } + + // add sign, if any + if neg { + i-- + a[i] = '-' + } + + dst.Write(a[i:]) +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atof.go b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atof.go new file mode 100644 index 000000000..46c1289ec --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atof.go @@ -0,0 +1,936 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's strconv/atof.go */ + +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package internal + +// decimal to binary floating point conversion. +// Algorithm: +// 1) Store input in multiprecision decimal. +// 2) Multiply/divide decimal by powers of two until in range [0.5, 1) +// 3) Multiply by 2^precision and round to get mantissa. + +import "math" + +var optimize = true // can change for testing + +func equalIgnoreCase(s1 []byte, s2 []byte) bool { + if len(s1) != len(s2) { + return false + } + for i := 0; i < len(s1); i++ { + c1 := s1[i] + if 'A' <= c1 && c1 <= 'Z' { + c1 += 'a' - 'A' + } + c2 := s2[i] + if 'A' <= c2 && c2 <= 'Z' { + c2 += 'a' - 'A' + } + if c1 != c2 { + return false + } + } + return true +} + +func special(s []byte) (f float64, ok bool) { + if len(s) == 0 { + return + } + switch s[0] { + default: + return + case '+': + if equalIgnoreCase(s, []byte("+inf")) || equalIgnoreCase(s, []byte("+infinity")) { + return math.Inf(1), true + } + case '-': + if equalIgnoreCase(s, []byte("-inf")) || equalIgnoreCase(s, []byte("-infinity")) { + return math.Inf(-1), true + } + case 'n', 'N': + if equalIgnoreCase(s, []byte("nan")) { + return math.NaN(), true + } + case 'i', 'I': + if equalIgnoreCase(s, []byte("inf")) || equalIgnoreCase(s, []byte("infinity")) { + return math.Inf(1), true + } + } + return +} + +func (b *decimal) set(s []byte) (ok bool) { + i := 0 + b.neg = false + b.trunc = false + + // optional sign + if i >= len(s) { + return + } + switch { + case s[i] == '+': + i++ + case s[i] == '-': + b.neg = true + i++ + } + + // digits + sawdot := false + sawdigits := false + for ; i < len(s); i++ { + switch { + case s[i] == '.': + if sawdot { + return + } + sawdot = true + b.dp = b.nd + continue + + case '0' <= s[i] && s[i] <= '9': + sawdigits = true + if s[i] == '0' && b.nd == 0 { // ignore leading zeros + b.dp-- + continue + } + if b.nd < len(b.d) { + b.d[b.nd] = s[i] + b.nd++ + } else if s[i] != '0' { + b.trunc = true + } + continue + } + break + } + if !sawdigits { + return + } + if !sawdot { + b.dp = b.nd + } + + // optional exponent moves decimal point. + // if we read a very large, very long number, + // just be sure to move the decimal point by + // a lot (say, 100000). it doesn't matter if it's + // not the exact number. + if i < len(s) && (s[i] == 'e' || s[i] == 'E') { + i++ + if i >= len(s) { + return + } + esign := 1 + if s[i] == '+' { + i++ + } else if s[i] == '-' { + i++ + esign = -1 + } + if i >= len(s) || s[i] < '0' || s[i] > '9' { + return + } + e := 0 + for ; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ { + if e < 10000 { + e = e*10 + int(s[i]) - '0' + } + } + b.dp += e * esign + } + + if i != len(s) { + return + } + + ok = true + return +} + +// readFloat reads a decimal mantissa and exponent from a float +// string representation. It sets ok to false if the number could +// not fit return types or is invalid. +func readFloat(s []byte) (mantissa uint64, exp int, neg, trunc, ok bool) { + const uint64digits = 19 + i := 0 + + // optional sign + if i >= len(s) { + return + } + switch { + case s[i] == '+': + i++ + case s[i] == '-': + neg = true + i++ + } + + // digits + sawdot := false + sawdigits := false + nd := 0 + ndMant := 0 + dp := 0 + for ; i < len(s); i++ { + switch c := s[i]; true { + case c == '.': + if sawdot { + return + } + sawdot = true + dp = nd + continue + + case '0' <= c && c <= '9': + sawdigits = true + if c == '0' && nd == 0 { // ignore leading zeros + dp-- + continue + } + nd++ + if ndMant < uint64digits { + mantissa *= 10 + mantissa += uint64(c - '0') + ndMant++ + } else if s[i] != '0' { + trunc = true + } + continue + } + break + } + if !sawdigits { + return + } + if !sawdot { + dp = nd + } + + // optional exponent moves decimal point. + // if we read a very large, very long number, + // just be sure to move the decimal point by + // a lot (say, 100000). it doesn't matter if it's + // not the exact number. + if i < len(s) && (s[i] == 'e' || s[i] == 'E') { + i++ + if i >= len(s) { + return + } + esign := 1 + if s[i] == '+' { + i++ + } else if s[i] == '-' { + i++ + esign = -1 + } + if i >= len(s) || s[i] < '0' || s[i] > '9' { + return + } + e := 0 + for ; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ { + if e < 10000 { + e = e*10 + int(s[i]) - '0' + } + } + dp += e * esign + } + + if i != len(s) { + return + } + + exp = dp - ndMant + ok = true + return + +} + +// decimal power of ten to binary power of two. +var powtab = []int{1, 3, 6, 9, 13, 16, 19, 23, 26} + +func (d *decimal) floatBits(flt *floatInfo) (b uint64, overflow bool) { + var exp int + var mant uint64 + + // Zero is always a special case. + if d.nd == 0 { + mant = 0 + exp = flt.bias + goto out + } + + // Obvious overflow/underflow. + // These bounds are for 64-bit floats. + // Will have to change if we want to support 80-bit floats in the future. + if d.dp > 310 { + goto overflow + } + if d.dp < -330 { + // zero + mant = 0 + exp = flt.bias + goto out + } + + // Scale by powers of two until in range [0.5, 1.0) + exp = 0 + for d.dp > 0 { + var n int + if d.dp >= len(powtab) { + n = 27 + } else { + n = powtab[d.dp] + } + d.Shift(-n) + exp += n + } + for d.dp < 0 || d.dp == 0 && d.d[0] < '5' { + var n int + if -d.dp >= len(powtab) { + n = 27 + } else { + n = powtab[-d.dp] + } + d.Shift(n) + exp -= n + } + + // Our range is [0.5,1) but floating point range is [1,2). + exp-- + + // Minimum representable exponent is flt.bias+1. + // If the exponent is smaller, move it up and + // adjust d accordingly. + if exp < flt.bias+1 { + n := flt.bias + 1 - exp + d.Shift(-n) + exp += n + } + + if exp-flt.bias >= 1<<flt.expbits-1 { + goto overflow + } + + // Extract 1+flt.mantbits bits. + d.Shift(int(1 + flt.mantbits)) + mant = d.RoundedInteger() + + // Rounding might have added a bit; shift down. + if mant == 2<<flt.mantbits { + mant >>= 1 + exp++ + if exp-flt.bias >= 1<<flt.expbits-1 { + goto overflow + } + } + + // Denormalized? + if mant&(1<<flt.mantbits) == 0 { + exp = flt.bias + } + goto out + +overflow: + // ±Inf + mant = 0 + exp = 1<<flt.expbits - 1 + flt.bias + overflow = true + +out: + // Assemble bits. + bits := mant & (uint64(1)<<flt.mantbits - 1) + bits |= uint64((exp-flt.bias)&(1<<flt.expbits-1)) << flt.mantbits + if d.neg { + bits |= 1 << flt.mantbits << flt.expbits + } + return bits, overflow +} + +// Exact powers of 10. +var float64pow10 = []float64{ + 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, + 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, + 1e20, 1e21, 1e22, +} +var float32pow10 = []float32{1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10} + +// If possible to convert decimal representation to 64-bit float f exactly, +// entirely in floating-point math, do so, avoiding the expense of decimalToFloatBits. +// Three common cases: +// value is exact integer +// value is exact integer * exact power of ten +// value is exact integer / exact power of ten +// These all produce potentially inexact but correctly rounded answers. +func atof64exact(mantissa uint64, exp int, neg bool) (f float64, ok bool) { + if mantissa>>float64info.mantbits != 0 { + return + } + f = float64(mantissa) + if neg { + f = -f + } + switch { + case exp == 0: + // an integer. + return f, true + // Exact integers are <= 10^15. + // Exact powers of ten are <= 10^22. + case exp > 0 && exp <= 15+22: // int * 10^k + // If exponent is big but number of digits is not, + // can move a few zeros into the integer part. + if exp > 22 { + f *= float64pow10[exp-22] + exp = 22 + } + if f > 1e15 || f < -1e15 { + // the exponent was really too large. + return + } + return f * float64pow10[exp], true + case exp < 0 && exp >= -22: // int / 10^k + return f / float64pow10[-exp], true + } + return +} + +// If possible to compute mantissa*10^exp to 32-bit float f exactly, +// entirely in floating-point math, do so, avoiding the machinery above. +func atof32exact(mantissa uint64, exp int, neg bool) (f float32, ok bool) { + if mantissa>>float32info.mantbits != 0 { + return + } + f = float32(mantissa) + if neg { + f = -f + } + switch { + case exp == 0: + return f, true + // Exact integers are <= 10^7. + // Exact powers of ten are <= 10^10. + case exp > 0 && exp <= 7+10: // int * 10^k + // If exponent is big but number of digits is not, + // can move a few zeros into the integer part. + if exp > 10 { + f *= float32pow10[exp-10] + exp = 10 + } + if f > 1e7 || f < -1e7 { + // the exponent was really too large. + return + } + return f * float32pow10[exp], true + case exp < 0 && exp >= -10: // int / 10^k + return f / float32pow10[-exp], true + } + return +} + +const fnParseFloat = "ParseFloat" + +func atof32(s []byte) (f float32, err error) { + if val, ok := special(s); ok { + return float32(val), nil + } + + if optimize { + // Parse mantissa and exponent. + mantissa, exp, neg, trunc, ok := readFloat(s) + if ok { + // Try pure floating-point arithmetic conversion. + if !trunc { + if f, ok := atof32exact(mantissa, exp, neg); ok { + return f, nil + } + } + // Try another fast path. + ext := new(extFloat) + if ok := ext.AssignDecimal(mantissa, exp, neg, trunc, &float32info); ok { + b, ovf := ext.floatBits(&float32info) + f = math.Float32frombits(uint32(b)) + if ovf { + err = rangeError(fnParseFloat, string(s)) + } + return f, err + } + } + } + var d decimal + if !d.set(s) { + return 0, syntaxError(fnParseFloat, string(s)) + } + b, ovf := d.floatBits(&float32info) + f = math.Float32frombits(uint32(b)) + if ovf { + err = rangeError(fnParseFloat, string(s)) + } + return f, err +} + +func atof64(s []byte) (f float64, err error) { + if val, ok := special(s); ok { + return val, nil + } + + if optimize { + // Parse mantissa and exponent. + mantissa, exp, neg, trunc, ok := readFloat(s) + if ok { + // Try pure floating-point arithmetic conversion. + if !trunc { + if f, ok := atof64exact(mantissa, exp, neg); ok { + return f, nil + } + } + // Try another fast path. + ext := new(extFloat) + if ok := ext.AssignDecimal(mantissa, exp, neg, trunc, &float64info); ok { + b, ovf := ext.floatBits(&float64info) + f = math.Float64frombits(b) + if ovf { + err = rangeError(fnParseFloat, string(s)) + } + return f, err + } + } + } + var d decimal + if !d.set(s) { + return 0, syntaxError(fnParseFloat, string(s)) + } + b, ovf := d.floatBits(&float64info) + f = math.Float64frombits(b) + if ovf { + err = rangeError(fnParseFloat, string(s)) + } + return f, err +} + +// ParseFloat converts the string s to a floating-point number +// with the precision specified by bitSize: 32 for float32, or 64 for float64. +// When bitSize=32, the result still has type float64, but it will be +// convertible to float32 without changing its value. +// +// If s is well-formed and near a valid floating point number, +// ParseFloat returns the nearest floating point number rounded +// using IEEE754 unbiased rounding. +// +// The errors that ParseFloat returns have concrete type *NumError +// and include err.Num = s. +// +// If s is not syntactically well-formed, ParseFloat returns err.Err = ErrSyntax. +// +// If s is syntactically well-formed but is more than 1/2 ULP +// away from the largest floating point number of the given size, +// ParseFloat returns f = ±Inf, err.Err = ErrRange. +func ParseFloat(s []byte, bitSize int) (f float64, err error) { + if bitSize == 32 { + f1, err1 := atof32(s) + return float64(f1), err1 + } + f1, err1 := atof64(s) + return f1, err1 +} + +// oroginal: strconv/decimal.go, but not exported, and needed for PareFloat. + +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Multiprecision decimal numbers. +// For floating-point formatting only; not general purpose. +// Only operations are assign and (binary) left/right shift. +// Can do binary floating point in multiprecision decimal precisely +// because 2 divides 10; cannot do decimal floating point +// in multiprecision binary precisely. + +type decimal struct { + d [800]byte // digits + nd int // number of digits used + dp int // decimal point + neg bool + trunc bool // discarded nonzero digits beyond d[:nd] +} + +func (a *decimal) String() string { + n := 10 + a.nd + if a.dp > 0 { + n += a.dp + } + if a.dp < 0 { + n += -a.dp + } + + buf := make([]byte, n) + w := 0 + switch { + case a.nd == 0: + return "0" + + case a.dp <= 0: + // zeros fill space between decimal point and digits + buf[w] = '0' + w++ + buf[w] = '.' + w++ + w += digitZero(buf[w : w+-a.dp]) + w += copy(buf[w:], a.d[0:a.nd]) + + case a.dp < a.nd: + // decimal point in middle of digits + w += copy(buf[w:], a.d[0:a.dp]) + buf[w] = '.' + w++ + w += copy(buf[w:], a.d[a.dp:a.nd]) + + default: + // zeros fill space between digits and decimal point + w += copy(buf[w:], a.d[0:a.nd]) + w += digitZero(buf[w : w+a.dp-a.nd]) + } + return string(buf[0:w]) +} + +func digitZero(dst []byte) int { + for i := range dst { + dst[i] = '0' + } + return len(dst) +} + +// trim trailing zeros from number. +// (They are meaningless; the decimal point is tracked +// independent of the number of digits.) +func trim(a *decimal) { + for a.nd > 0 && a.d[a.nd-1] == '0' { + a.nd-- + } + if a.nd == 0 { + a.dp = 0 + } +} + +// Assign v to a. +func (a *decimal) Assign(v uint64) { + var buf [24]byte + + // Write reversed decimal in buf. + n := 0 + for v > 0 { + v1 := v / 10 + v -= 10 * v1 + buf[n] = byte(v + '0') + n++ + v = v1 + } + + // Reverse again to produce forward decimal in a.d. + a.nd = 0 + for n--; n >= 0; n-- { + a.d[a.nd] = buf[n] + a.nd++ + } + a.dp = a.nd + trim(a) +} + +// Maximum shift that we can do in one pass without overflow. +// Signed int has 31 bits, and we have to be able to accommodate 9<<k. +const maxShift = 27 + +// Binary shift right (* 2) by k bits. k <= maxShift to avoid overflow. +func rightShift(a *decimal, k uint) { + r := 0 // read pointer + w := 0 // write pointer + + // Pick up enough leading digits to cover first shift. + n := 0 + for ; n>>k == 0; r++ { + if r >= a.nd { + if n == 0 { + // a == 0; shouldn't get here, but handle anyway. + a.nd = 0 + return + } + for n>>k == 0 { + n = n * 10 + r++ + } + break + } + c := int(a.d[r]) + n = n*10 + c - '0' + } + a.dp -= r - 1 + + // Pick up a digit, put down a digit. + for ; r < a.nd; r++ { + c := int(a.d[r]) + dig := n >> k + n -= dig << k + a.d[w] = byte(dig + '0') + w++ + n = n*10 + c - '0' + } + + // Put down extra digits. + for n > 0 { + dig := n >> k + n -= dig << k + if w < len(a.d) { + a.d[w] = byte(dig + '0') + w++ + } else if dig > 0 { + a.trunc = true + } + n = n * 10 + } + + a.nd = w + trim(a) +} + +// Cheat sheet for left shift: table indexed by shift count giving +// number of new digits that will be introduced by that shift. +// +// For example, leftcheats[4] = {2, "625"}. That means that +// if we are shifting by 4 (multiplying by 16), it will add 2 digits +// when the string prefix is "625" through "999", and one fewer digit +// if the string prefix is "000" through "624". +// +// Credit for this trick goes to Ken. + +type leftCheat struct { + delta int // number of new digits + cutoff string // minus one digit if original < a. +} + +var leftcheats = []leftCheat{ + // Leading digits of 1/2^i = 5^i. + // 5^23 is not an exact 64-bit floating point number, + // so have to use bc for the math. + /* + seq 27 | sed 's/^/5^/' | bc | + awk 'BEGIN{ print "\tleftCheat{ 0, \"\" }," } + { + log2 = log(2)/log(10) + printf("\tleftCheat{ %d, \"%s\" },\t// * %d\n", + int(log2*NR+1), $0, 2**NR) + }' + */ + {0, ""}, + {1, "5"}, // * 2 + {1, "25"}, // * 4 + {1, "125"}, // * 8 + {2, "625"}, // * 16 + {2, "3125"}, // * 32 + {2, "15625"}, // * 64 + {3, "78125"}, // * 128 + {3, "390625"}, // * 256 + {3, "1953125"}, // * 512 + {4, "9765625"}, // * 1024 + {4, "48828125"}, // * 2048 + {4, "244140625"}, // * 4096 + {4, "1220703125"}, // * 8192 + {5, "6103515625"}, // * 16384 + {5, "30517578125"}, // * 32768 + {5, "152587890625"}, // * 65536 + {6, "762939453125"}, // * 131072 + {6, "3814697265625"}, // * 262144 + {6, "19073486328125"}, // * 524288 + {7, "95367431640625"}, // * 1048576 + {7, "476837158203125"}, // * 2097152 + {7, "2384185791015625"}, // * 4194304 + {7, "11920928955078125"}, // * 8388608 + {8, "59604644775390625"}, // * 16777216 + {8, "298023223876953125"}, // * 33554432 + {8, "1490116119384765625"}, // * 67108864 + {9, "7450580596923828125"}, // * 134217728 +} + +// Is the leading prefix of b lexicographically less than s? +func prefixIsLessThan(b []byte, s string) bool { + for i := 0; i < len(s); i++ { + if i >= len(b) { + return true + } + if b[i] != s[i] { + return b[i] < s[i] + } + } + return false +} + +// Binary shift left (/ 2) by k bits. k <= maxShift to avoid overflow. +func leftShift(a *decimal, k uint) { + delta := leftcheats[k].delta + if prefixIsLessThan(a.d[0:a.nd], leftcheats[k].cutoff) { + delta-- + } + + r := a.nd // read index + w := a.nd + delta // write index + n := 0 + + // Pick up a digit, put down a digit. + for r--; r >= 0; r-- { + n += (int(a.d[r]) - '0') << k + quo := n / 10 + rem := n - 10*quo + w-- + if w < len(a.d) { + a.d[w] = byte(rem + '0') + } else if rem != 0 { + a.trunc = true + } + n = quo + } + + // Put down extra digits. + for n > 0 { + quo := n / 10 + rem := n - 10*quo + w-- + if w < len(a.d) { + a.d[w] = byte(rem + '0') + } else if rem != 0 { + a.trunc = true + } + n = quo + } + + a.nd += delta + if a.nd >= len(a.d) { + a.nd = len(a.d) + } + a.dp += delta + trim(a) +} + +// Binary shift left (k > 0) or right (k < 0). +func (a *decimal) Shift(k int) { + switch { + case a.nd == 0: + // nothing to do: a == 0 + case k > 0: + for k > maxShift { + leftShift(a, maxShift) + k -= maxShift + } + leftShift(a, uint(k)) + case k < 0: + for k < -maxShift { + rightShift(a, maxShift) + k += maxShift + } + rightShift(a, uint(-k)) + } +} + +// If we chop a at nd digits, should we round up? +func shouldRoundUp(a *decimal, nd int) bool { + if nd < 0 || nd >= a.nd { + return false + } + if a.d[nd] == '5' && nd+1 == a.nd { // exactly halfway - round to even + // if we truncated, a little higher than what's recorded - always round up + if a.trunc { + return true + } + return nd > 0 && (a.d[nd-1]-'0')%2 != 0 + } + // not halfway - digit tells all + return a.d[nd] >= '5' +} + +// Round a to nd digits (or fewer). +// If nd is zero, it means we're rounding +// just to the left of the digits, as in +// 0.09 -> 0.1. +func (a *decimal) Round(nd int) { + if nd < 0 || nd >= a.nd { + return + } + if shouldRoundUp(a, nd) { + a.RoundUp(nd) + } else { + a.RoundDown(nd) + } +} + +// Round a down to nd digits (or fewer). +func (a *decimal) RoundDown(nd int) { + if nd < 0 || nd >= a.nd { + return + } + a.nd = nd + trim(a) +} + +// Round a up to nd digits (or fewer). +func (a *decimal) RoundUp(nd int) { + if nd < 0 || nd >= a.nd { + return + } + + // round up + for i := nd - 1; i >= 0; i-- { + c := a.d[i] + if c < '9' { // can stop after this digit + a.d[i]++ + a.nd = i + 1 + return + } + } + + // Number is all 9s. + // Change to single 1 with adjusted decimal point. + a.d[0] = '1' + a.nd = 1 + a.dp++ +} + +// Extract integer part, rounded appropriately. +// No guarantees about overflow. +func (a *decimal) RoundedInteger() uint64 { + if a.dp > 20 { + return 0xFFFFFFFFFFFFFFFF + } + var i int + n := uint64(0) + for i = 0; i < a.dp && i < a.nd; i++ { + n = n*10 + uint64(a.d[i]-'0') + } + for ; i < a.dp; i++ { + n *= 10 + } + if shouldRoundUp(a, a.dp) { + n++ + } + return n +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atoi.go b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atoi.go new file mode 100644 index 000000000..06eb2ec29 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/atoi.go @@ -0,0 +1,213 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's strconv/atoi.go */ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package internal + +import ( + "errors" + "strconv" +) + +// ErrRange indicates that a value is out of range for the target type. +var ErrRange = errors.New("value out of range") + +// ErrSyntax indicates that a value does not have the right syntax for the target type. +var ErrSyntax = errors.New("invalid syntax") + +// A NumError records a failed conversion. +type NumError struct { + Func string // the failing function (ParseBool, ParseInt, ParseUint, ParseFloat) + Num string // the input + Err error // the reason the conversion failed (ErrRange, ErrSyntax) +} + +func (e *NumError) Error() string { + return "strconv." + e.Func + ": " + "parsing " + strconv.Quote(e.Num) + ": " + e.Err.Error() +} + +func syntaxError(fn, str string) *NumError { + return &NumError{fn, str, ErrSyntax} +} + +func rangeError(fn, str string) *NumError { + return &NumError{fn, str, ErrRange} +} + +const intSize = 32 << uint(^uint(0)>>63) + +// IntSize is the size in bits of an int or uint value. +const IntSize = intSize + +// Return the first number n such that n*base >= 1<<64. +func cutoff64(base int) uint64 { + if base < 2 { + return 0 + } + return (1<<64-1)/uint64(base) + 1 +} + +// ParseUint is like ParseInt but for unsigned numbers, and oeprating on []byte +func ParseUint(s []byte, base int, bitSize int) (n uint64, err error) { + var cutoff, maxVal uint64 + + if bitSize == 0 { + bitSize = int(IntSize) + } + + s0 := s + switch { + case len(s) < 1: + err = ErrSyntax + goto Error + + case 2 <= base && base <= 36: + // valid base; nothing to do + + case base == 0: + // Look for octal, hex prefix. + switch { + case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'): + base = 16 + s = s[2:] + if len(s) < 1 { + err = ErrSyntax + goto Error + } + case s[0] == '0': + base = 8 + default: + base = 10 + } + + default: + err = errors.New("invalid base " + strconv.Itoa(base)) + goto Error + } + + n = 0 + cutoff = cutoff64(base) + maxVal = 1<<uint(bitSize) - 1 + + for i := 0; i < len(s); i++ { + var v byte + d := s[i] + switch { + case '0' <= d && d <= '9': + v = d - '0' + case 'a' <= d && d <= 'z': + v = d - 'a' + 10 + case 'A' <= d && d <= 'Z': + v = d - 'A' + 10 + default: + n = 0 + err = ErrSyntax + goto Error + } + if int(v) >= base { + n = 0 + err = ErrSyntax + goto Error + } + + if n >= cutoff { + // n*base overflows + n = 1<<64 - 1 + err = ErrRange + goto Error + } + n *= uint64(base) + + n1 := n + uint64(v) + if n1 < n || n1 > maxVal { + // n+v overflows + n = 1<<64 - 1 + err = ErrRange + goto Error + } + n = n1 + } + + return n, nil + +Error: + return n, &NumError{"ParseUint", string(s0), err} +} + +// ParseInt interprets a string s in the given base (2 to 36) and +// returns the corresponding value i. If base == 0, the base is +// implied by the string's prefix: base 16 for "0x", base 8 for +// "0", and base 10 otherwise. +// +// The bitSize argument specifies the integer type +// that the result must fit into. Bit sizes 0, 8, 16, 32, and 64 +// correspond to int, int8, int16, int32, and int64. +// +// The errors that ParseInt returns have concrete type *NumError +// and include err.Num = s. If s is empty or contains invalid +// digits, err.Err = ErrSyntax and the returned value is 0; +// if the value corresponding to s cannot be represented by a +// signed integer of the given size, err.Err = ErrRange and the +// returned value is the maximum magnitude integer of the +// appropriate bitSize and sign. +func ParseInt(s []byte, base int, bitSize int) (i int64, err error) { + const fnParseInt = "ParseInt" + + if bitSize == 0 { + bitSize = int(IntSize) + } + + // Empty string bad. + if len(s) == 0 { + return 0, syntaxError(fnParseInt, string(s)) + } + + // Pick off leading sign. + s0 := s + neg := false + if s[0] == '+' { + s = s[1:] + } else if s[0] == '-' { + neg = true + s = s[1:] + } + + // Convert unsigned and check range. + var un uint64 + un, err = ParseUint(s, base, bitSize) + if err != nil && err.(*NumError).Err != ErrRange { + err.(*NumError).Func = fnParseInt + err.(*NumError).Num = string(s0) + return 0, err + } + cutoff := uint64(1 << uint(bitSize-1)) + if !neg && un >= cutoff { + return int64(cutoff - 1), rangeError(fnParseInt, string(s0)) + } + if neg && un > cutoff { + return -int64(cutoff), rangeError(fnParseInt, string(s0)) + } + n := int64(un) + if neg { + n = -n + } + return n, nil +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/internal/extfloat.go b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/extfloat.go new file mode 100644 index 000000000..ab791085a --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/extfloat.go @@ -0,0 +1,668 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package internal + +// An extFloat represents an extended floating-point number, with more +// precision than a float64. It does not try to save bits: the +// number represented by the structure is mant*(2^exp), with a negative +// sign if neg is true. +type extFloat struct { + mant uint64 + exp int + neg bool +} + +// Powers of ten taken from double-conversion library. +// http://code.google.com/p/double-conversion/ +const ( + firstPowerOfTen = -348 + stepPowerOfTen = 8 +) + +var smallPowersOfTen = [...]extFloat{ + {1 << 63, -63, false}, // 1 + {0xa << 60, -60, false}, // 1e1 + {0x64 << 57, -57, false}, // 1e2 + {0x3e8 << 54, -54, false}, // 1e3 + {0x2710 << 50, -50, false}, // 1e4 + {0x186a0 << 47, -47, false}, // 1e5 + {0xf4240 << 44, -44, false}, // 1e6 + {0x989680 << 40, -40, false}, // 1e7 +} + +var powersOfTen = [...]extFloat{ + {0xfa8fd5a0081c0288, -1220, false}, // 10^-348 + {0xbaaee17fa23ebf76, -1193, false}, // 10^-340 + {0x8b16fb203055ac76, -1166, false}, // 10^-332 + {0xcf42894a5dce35ea, -1140, false}, // 10^-324 + {0x9a6bb0aa55653b2d, -1113, false}, // 10^-316 + {0xe61acf033d1a45df, -1087, false}, // 10^-308 + {0xab70fe17c79ac6ca, -1060, false}, // 10^-300 + {0xff77b1fcbebcdc4f, -1034, false}, // 10^-292 + {0xbe5691ef416bd60c, -1007, false}, // 10^-284 + {0x8dd01fad907ffc3c, -980, false}, // 10^-276 + {0xd3515c2831559a83, -954, false}, // 10^-268 + {0x9d71ac8fada6c9b5, -927, false}, // 10^-260 + {0xea9c227723ee8bcb, -901, false}, // 10^-252 + {0xaecc49914078536d, -874, false}, // 10^-244 + {0x823c12795db6ce57, -847, false}, // 10^-236 + {0xc21094364dfb5637, -821, false}, // 10^-228 + {0x9096ea6f3848984f, -794, false}, // 10^-220 + {0xd77485cb25823ac7, -768, false}, // 10^-212 + {0xa086cfcd97bf97f4, -741, false}, // 10^-204 + {0xef340a98172aace5, -715, false}, // 10^-196 + {0xb23867fb2a35b28e, -688, false}, // 10^-188 + {0x84c8d4dfd2c63f3b, -661, false}, // 10^-180 + {0xc5dd44271ad3cdba, -635, false}, // 10^-172 + {0x936b9fcebb25c996, -608, false}, // 10^-164 + {0xdbac6c247d62a584, -582, false}, // 10^-156 + {0xa3ab66580d5fdaf6, -555, false}, // 10^-148 + {0xf3e2f893dec3f126, -529, false}, // 10^-140 + {0xb5b5ada8aaff80b8, -502, false}, // 10^-132 + {0x87625f056c7c4a8b, -475, false}, // 10^-124 + {0xc9bcff6034c13053, -449, false}, // 10^-116 + {0x964e858c91ba2655, -422, false}, // 10^-108 + {0xdff9772470297ebd, -396, false}, // 10^-100 + {0xa6dfbd9fb8e5b88f, -369, false}, // 10^-92 + {0xf8a95fcf88747d94, -343, false}, // 10^-84 + {0xb94470938fa89bcf, -316, false}, // 10^-76 + {0x8a08f0f8bf0f156b, -289, false}, // 10^-68 + {0xcdb02555653131b6, -263, false}, // 10^-60 + {0x993fe2c6d07b7fac, -236, false}, // 10^-52 + {0xe45c10c42a2b3b06, -210, false}, // 10^-44 + {0xaa242499697392d3, -183, false}, // 10^-36 + {0xfd87b5f28300ca0e, -157, false}, // 10^-28 + {0xbce5086492111aeb, -130, false}, // 10^-20 + {0x8cbccc096f5088cc, -103, false}, // 10^-12 + {0xd1b71758e219652c, -77, false}, // 10^-4 + {0x9c40000000000000, -50, false}, // 10^4 + {0xe8d4a51000000000, -24, false}, // 10^12 + {0xad78ebc5ac620000, 3, false}, // 10^20 + {0x813f3978f8940984, 30, false}, // 10^28 + {0xc097ce7bc90715b3, 56, false}, // 10^36 + {0x8f7e32ce7bea5c70, 83, false}, // 10^44 + {0xd5d238a4abe98068, 109, false}, // 10^52 + {0x9f4f2726179a2245, 136, false}, // 10^60 + {0xed63a231d4c4fb27, 162, false}, // 10^68 + {0xb0de65388cc8ada8, 189, false}, // 10^76 + {0x83c7088e1aab65db, 216, false}, // 10^84 + {0xc45d1df942711d9a, 242, false}, // 10^92 + {0x924d692ca61be758, 269, false}, // 10^100 + {0xda01ee641a708dea, 295, false}, // 10^108 + {0xa26da3999aef774a, 322, false}, // 10^116 + {0xf209787bb47d6b85, 348, false}, // 10^124 + {0xb454e4a179dd1877, 375, false}, // 10^132 + {0x865b86925b9bc5c2, 402, false}, // 10^140 + {0xc83553c5c8965d3d, 428, false}, // 10^148 + {0x952ab45cfa97a0b3, 455, false}, // 10^156 + {0xde469fbd99a05fe3, 481, false}, // 10^164 + {0xa59bc234db398c25, 508, false}, // 10^172 + {0xf6c69a72a3989f5c, 534, false}, // 10^180 + {0xb7dcbf5354e9bece, 561, false}, // 10^188 + {0x88fcf317f22241e2, 588, false}, // 10^196 + {0xcc20ce9bd35c78a5, 614, false}, // 10^204 + {0x98165af37b2153df, 641, false}, // 10^212 + {0xe2a0b5dc971f303a, 667, false}, // 10^220 + {0xa8d9d1535ce3b396, 694, false}, // 10^228 + {0xfb9b7cd9a4a7443c, 720, false}, // 10^236 + {0xbb764c4ca7a44410, 747, false}, // 10^244 + {0x8bab8eefb6409c1a, 774, false}, // 10^252 + {0xd01fef10a657842c, 800, false}, // 10^260 + {0x9b10a4e5e9913129, 827, false}, // 10^268 + {0xe7109bfba19c0c9d, 853, false}, // 10^276 + {0xac2820d9623bf429, 880, false}, // 10^284 + {0x80444b5e7aa7cf85, 907, false}, // 10^292 + {0xbf21e44003acdd2d, 933, false}, // 10^300 + {0x8e679c2f5e44ff8f, 960, false}, // 10^308 + {0xd433179d9c8cb841, 986, false}, // 10^316 + {0x9e19db92b4e31ba9, 1013, false}, // 10^324 + {0xeb96bf6ebadf77d9, 1039, false}, // 10^332 + {0xaf87023b9bf0ee6b, 1066, false}, // 10^340 +} + +// floatBits returns the bits of the float64 that best approximates +// the extFloat passed as receiver. Overflow is set to true if +// the resulting float64 is ±Inf. +func (f *extFloat) floatBits(flt *floatInfo) (bits uint64, overflow bool) { + f.Normalize() + + exp := f.exp + 63 + + // Exponent too small. + if exp < flt.bias+1 { + n := flt.bias + 1 - exp + f.mant >>= uint(n) + exp += n + } + + // Extract 1+flt.mantbits bits from the 64-bit mantissa. + mant := f.mant >> (63 - flt.mantbits) + if f.mant&(1<<(62-flt.mantbits)) != 0 { + // Round up. + mant += 1 + } + + // Rounding might have added a bit; shift down. + if mant == 2<<flt.mantbits { + mant >>= 1 + exp++ + } + + // Infinities. + if exp-flt.bias >= 1<<flt.expbits-1 { + // ±Inf + mant = 0 + exp = 1<<flt.expbits - 1 + flt.bias + overflow = true + } else if mant&(1<<flt.mantbits) == 0 { + // Denormalized? + exp = flt.bias + } + // Assemble bits. + bits = mant & (uint64(1)<<flt.mantbits - 1) + bits |= uint64((exp-flt.bias)&(1<<flt.expbits-1)) << flt.mantbits + if f.neg { + bits |= 1 << (flt.mantbits + flt.expbits) + } + return +} + +// AssignComputeBounds sets f to the floating point value +// defined by mant, exp and precision given by flt. It returns +// lower, upper such that any number in the closed interval +// [lower, upper] is converted back to the same floating point number. +func (f *extFloat) AssignComputeBounds(mant uint64, exp int, neg bool, flt *floatInfo) (lower, upper extFloat) { + f.mant = mant + f.exp = exp - int(flt.mantbits) + f.neg = neg + if f.exp <= 0 && mant == (mant>>uint(-f.exp))<<uint(-f.exp) { + // An exact integer + f.mant >>= uint(-f.exp) + f.exp = 0 + return *f, *f + } + expBiased := exp - flt.bias + + upper = extFloat{mant: 2*f.mant + 1, exp: f.exp - 1, neg: f.neg} + if mant != 1<<flt.mantbits || expBiased == 1 { + lower = extFloat{mant: 2*f.mant - 1, exp: f.exp - 1, neg: f.neg} + } else { + lower = extFloat{mant: 4*f.mant - 1, exp: f.exp - 2, neg: f.neg} + } + return +} + +// Normalize normalizes f so that the highest bit of the mantissa is +// set, and returns the number by which the mantissa was left-shifted. +func (f *extFloat) Normalize() (shift uint) { + mant, exp := f.mant, f.exp + if mant == 0 { + return 0 + } + if mant>>(64-32) == 0 { + mant <<= 32 + exp -= 32 + } + if mant>>(64-16) == 0 { + mant <<= 16 + exp -= 16 + } + if mant>>(64-8) == 0 { + mant <<= 8 + exp -= 8 + } + if mant>>(64-4) == 0 { + mant <<= 4 + exp -= 4 + } + if mant>>(64-2) == 0 { + mant <<= 2 + exp -= 2 + } + if mant>>(64-1) == 0 { + mant <<= 1 + exp -= 1 + } + shift = uint(f.exp - exp) + f.mant, f.exp = mant, exp + return +} + +// Multiply sets f to the product f*g: the result is correctly rounded, +// but not normalized. +func (f *extFloat) Multiply(g extFloat) { + fhi, flo := f.mant>>32, uint64(uint32(f.mant)) + ghi, glo := g.mant>>32, uint64(uint32(g.mant)) + + // Cross products. + cross1 := fhi * glo + cross2 := flo * ghi + + // f.mant*g.mant is fhi*ghi << 64 + (cross1+cross2) << 32 + flo*glo + f.mant = fhi*ghi + (cross1 >> 32) + (cross2 >> 32) + rem := uint64(uint32(cross1)) + uint64(uint32(cross2)) + ((flo * glo) >> 32) + // Round up. + rem += (1 << 31) + + f.mant += (rem >> 32) + f.exp = f.exp + g.exp + 64 +} + +var uint64pow10 = [...]uint64{ + 1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, + 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, +} + +// AssignDecimal sets f to an approximate value mantissa*10^exp. It +// returns true if the value represented by f is guaranteed to be the +// best approximation of d after being rounded to a float64 or +// float32 depending on flt. +func (f *extFloat) AssignDecimal(mantissa uint64, exp10 int, neg bool, trunc bool, flt *floatInfo) (ok bool) { + const uint64digits = 19 + const errorscale = 8 + errors := 0 // An upper bound for error, computed in errorscale*ulp. + if trunc { + // the decimal number was truncated. + errors += errorscale / 2 + } + + f.mant = mantissa + f.exp = 0 + f.neg = neg + + // Multiply by powers of ten. + i := (exp10 - firstPowerOfTen) / stepPowerOfTen + if exp10 < firstPowerOfTen || i >= len(powersOfTen) { + return false + } + adjExp := (exp10 - firstPowerOfTen) % stepPowerOfTen + + // We multiply by exp%step + if adjExp < uint64digits && mantissa < uint64pow10[uint64digits-adjExp] { + // We can multiply the mantissa exactly. + f.mant *= uint64pow10[adjExp] + f.Normalize() + } else { + f.Normalize() + f.Multiply(smallPowersOfTen[adjExp]) + errors += errorscale / 2 + } + + // We multiply by 10 to the exp - exp%step. + f.Multiply(powersOfTen[i]) + if errors > 0 { + errors += 1 + } + errors += errorscale / 2 + + // Normalize + shift := f.Normalize() + errors <<= shift + + // Now f is a good approximation of the decimal. + // Check whether the error is too large: that is, if the mantissa + // is perturbated by the error, the resulting float64 will change. + // The 64 bits mantissa is 1 + 52 bits for float64 + 11 extra bits. + // + // In many cases the approximation will be good enough. + denormalExp := flt.bias - 63 + var extrabits uint + if f.exp <= denormalExp { + // f.mant * 2^f.exp is smaller than 2^(flt.bias+1). + extrabits = uint(63 - flt.mantbits + 1 + uint(denormalExp-f.exp)) + } else { + extrabits = uint(63 - flt.mantbits) + } + + halfway := uint64(1) << (extrabits - 1) + mant_extra := f.mant & (1<<extrabits - 1) + + // Do a signed comparison here! If the error estimate could make + // the mantissa round differently for the conversion to double, + // then we can't give a definite answer. + if int64(halfway)-int64(errors) < int64(mant_extra) && + int64(mant_extra) < int64(halfway)+int64(errors) { + return false + } + return true +} + +// Frexp10 is an analogue of math.Frexp for decimal powers. It scales +// f by an approximate power of ten 10^-exp, and returns exp10, so +// that f*10^exp10 has the same value as the old f, up to an ulp, +// as well as the index of 10^-exp in the powersOfTen table. +func (f *extFloat) frexp10() (exp10, index int) { + // The constants expMin and expMax constrain the final value of the + // binary exponent of f. We want a small integral part in the result + // because finding digits of an integer requires divisions, whereas + // digits of the fractional part can be found by repeatedly multiplying + // by 10. + const expMin = -60 + const expMax = -32 + // Find power of ten such that x * 10^n has a binary exponent + // between expMin and expMax. + approxExp10 := ((expMin+expMax)/2 - f.exp) * 28 / 93 // log(10)/log(2) is close to 93/28. + i := (approxExp10 - firstPowerOfTen) / stepPowerOfTen +Loop: + for { + exp := f.exp + powersOfTen[i].exp + 64 + switch { + case exp < expMin: + i++ + case exp > expMax: + i-- + default: + break Loop + } + } + // Apply the desired decimal shift on f. It will have exponent + // in the desired range. This is multiplication by 10^-exp10. + f.Multiply(powersOfTen[i]) + + return -(firstPowerOfTen + i*stepPowerOfTen), i +} + +// frexp10Many applies a common shift by a power of ten to a, b, c. +func frexp10Many(a, b, c *extFloat) (exp10 int) { + exp10, i := c.frexp10() + a.Multiply(powersOfTen[i]) + b.Multiply(powersOfTen[i]) + return +} + +// FixedDecimal stores in d the first n significant digits +// of the decimal representation of f. It returns false +// if it cannot be sure of the answer. +func (f *extFloat) FixedDecimal(d *decimalSlice, n int) bool { + if f.mant == 0 { + d.nd = 0 + d.dp = 0 + d.neg = f.neg + return true + } + if n == 0 { + panic("strconv: internal error: extFloat.FixedDecimal called with n == 0") + } + // Multiply by an appropriate power of ten to have a reasonable + // number to process. + f.Normalize() + exp10, _ := f.frexp10() + + shift := uint(-f.exp) + integer := uint32(f.mant >> shift) + fraction := f.mant - (uint64(integer) << shift) + ε := uint64(1) // ε is the uncertainty we have on the mantissa of f. + + // Write exactly n digits to d. + needed := n // how many digits are left to write. + integerDigits := 0 // the number of decimal digits of integer. + pow10 := uint64(1) // the power of ten by which f was scaled. + for i, pow := 0, uint64(1); i < 20; i++ { + if pow > uint64(integer) { + integerDigits = i + break + } + pow *= 10 + } + rest := integer + if integerDigits > needed { + // the integral part is already large, trim the last digits. + pow10 = uint64pow10[integerDigits-needed] + integer /= uint32(pow10) + rest -= integer * uint32(pow10) + } else { + rest = 0 + } + + // Write the digits of integer: the digits of rest are omitted. + var buf [32]byte + pos := len(buf) + for v := integer; v > 0; { + v1 := v / 10 + v -= 10 * v1 + pos-- + buf[pos] = byte(v + '0') + v = v1 + } + for i := pos; i < len(buf); i++ { + d.d[i-pos] = buf[i] + } + nd := len(buf) - pos + d.nd = nd + d.dp = integerDigits + exp10 + needed -= nd + + if needed > 0 { + if rest != 0 || pow10 != 1 { + panic("strconv: internal error, rest != 0 but needed > 0") + } + // Emit digits for the fractional part. Each time, 10*fraction + // fits in a uint64 without overflow. + for needed > 0 { + fraction *= 10 + ε *= 10 // the uncertainty scales as we multiply by ten. + if 2*ε > 1<<shift { + // the error is so large it could modify which digit to write, abort. + return false + } + digit := fraction >> shift + d.d[nd] = byte(digit + '0') + fraction -= digit << shift + nd++ + needed-- + } + d.nd = nd + } + + // We have written a truncation of f (a numerator / 10^d.dp). The remaining part + // can be interpreted as a small number (< 1) to be added to the last digit of the + // numerator. + // + // If rest > 0, the amount is: + // (rest<<shift | fraction) / (pow10 << shift) + // fraction being known with a ±ε uncertainty. + // The fact that n > 0 guarantees that pow10 << shift does not overflow a uint64. + // + // If rest = 0, pow10 == 1 and the amount is + // fraction / (1 << shift) + // fraction being known with a ±ε uncertainty. + // + // We pass this information to the rounding routine for adjustment. + + ok := adjustLastDigitFixed(d, uint64(rest)<<shift|fraction, pow10, shift, ε) + if !ok { + return false + } + // Trim trailing zeros. + for i := d.nd - 1; i >= 0; i-- { + if d.d[i] != '0' { + d.nd = i + 1 + break + } + } + return true +} + +// adjustLastDigitFixed assumes d contains the representation of the integral part +// of some number, whose fractional part is num / (den << shift). The numerator +// num is only known up to an uncertainty of size ε, assumed to be less than +// (den << shift)/2. +// +// It will increase the last digit by one to account for correct rounding, typically +// when the fractional part is greater than 1/2, and will return false if ε is such +// that no correct answer can be given. +func adjustLastDigitFixed(d *decimalSlice, num, den uint64, shift uint, ε uint64) bool { + if num > den<<shift { + panic("strconv: num > den<<shift in adjustLastDigitFixed") + } + if 2*ε > den<<shift { + panic("strconv: ε > (den<<shift)/2") + } + if 2*(num+ε) < den<<shift { + return true + } + if 2*(num-ε) > den<<shift { + // increment d by 1. + i := d.nd - 1 + for ; i >= 0; i-- { + if d.d[i] == '9' { + d.nd-- + } else { + break + } + } + if i < 0 { + d.d[0] = '1' + d.nd = 1 + d.dp++ + } else { + d.d[i]++ + } + return true + } + return false +} + +// ShortestDecimal stores in d the shortest decimal representation of f +// which belongs to the open interval (lower, upper), where f is supposed +// to lie. It returns false whenever the result is unsure. The implementation +// uses the Grisu3 algorithm. +func (f *extFloat) ShortestDecimal(d *decimalSlice, lower, upper *extFloat) bool { + if f.mant == 0 { + d.nd = 0 + d.dp = 0 + d.neg = f.neg + return true + } + if f.exp == 0 && *lower == *f && *lower == *upper { + // an exact integer. + var buf [24]byte + n := len(buf) - 1 + for v := f.mant; v > 0; { + v1 := v / 10 + v -= 10 * v1 + buf[n] = byte(v + '0') + n-- + v = v1 + } + nd := len(buf) - n - 1 + for i := 0; i < nd; i++ { + d.d[i] = buf[n+1+i] + } + d.nd, d.dp = nd, nd + for d.nd > 0 && d.d[d.nd-1] == '0' { + d.nd-- + } + if d.nd == 0 { + d.dp = 0 + } + d.neg = f.neg + return true + } + upper.Normalize() + // Uniformize exponents. + if f.exp > upper.exp { + f.mant <<= uint(f.exp - upper.exp) + f.exp = upper.exp + } + if lower.exp > upper.exp { + lower.mant <<= uint(lower.exp - upper.exp) + lower.exp = upper.exp + } + + exp10 := frexp10Many(lower, f, upper) + // Take a safety margin due to rounding in frexp10Many, but we lose precision. + upper.mant++ + lower.mant-- + + // The shortest representation of f is either rounded up or down, but + // in any case, it is a truncation of upper. + shift := uint(-upper.exp) + integer := uint32(upper.mant >> shift) + fraction := upper.mant - (uint64(integer) << shift) + + // How far we can go down from upper until the result is wrong. + allowance := upper.mant - lower.mant + // How far we should go to get a very precise result. + targetDiff := upper.mant - f.mant + + // Count integral digits: there are at most 10. + var integerDigits int + for i, pow := 0, uint64(1); i < 20; i++ { + if pow > uint64(integer) { + integerDigits = i + break + } + pow *= 10 + } + for i := 0; i < integerDigits; i++ { + pow := uint64pow10[integerDigits-i-1] + digit := integer / uint32(pow) + d.d[i] = byte(digit + '0') + integer -= digit * uint32(pow) + // evaluate whether we should stop. + if currentDiff := uint64(integer)<<shift + fraction; currentDiff < allowance { + d.nd = i + 1 + d.dp = integerDigits + exp10 + d.neg = f.neg + // Sometimes allowance is so large the last digit might need to be + // decremented to get closer to f. + return adjustLastDigit(d, currentDiff, targetDiff, allowance, pow<<shift, 2) + } + } + d.nd = integerDigits + d.dp = d.nd + exp10 + d.neg = f.neg + + // Compute digits of the fractional part. At each step fraction does not + // overflow. The choice of minExp implies that fraction is less than 2^60. + var digit int + multiplier := uint64(1) + for { + fraction *= 10 + multiplier *= 10 + digit = int(fraction >> shift) + d.d[d.nd] = byte(digit + '0') + d.nd++ + fraction -= uint64(digit) << shift + if fraction < allowance*multiplier { + // We are in the admissible range. Note that if allowance is about to + // overflow, that is, allowance > 2^64/10, the condition is automatically + // true due to the limited range of fraction. + return adjustLastDigit(d, + fraction, targetDiff*multiplier, allowance*multiplier, + 1<<shift, multiplier*2) + } + } +} + +// adjustLastDigit modifies d = x-currentDiff*ε, to get closest to +// d = x-targetDiff*ε, without becoming smaller than x-maxDiff*ε. +// It assumes that a decimal digit is worth ulpDecimal*ε, and that +// all data is known with a error estimate of ulpBinary*ε. +func adjustLastDigit(d *decimalSlice, currentDiff, targetDiff, maxDiff, ulpDecimal, ulpBinary uint64) bool { + if ulpDecimal < 2*ulpBinary { + // Approximation is too wide. + return false + } + for currentDiff+ulpDecimal/2+ulpBinary < targetDiff { + d.d[d.nd-1]-- + currentDiff += ulpDecimal + } + if currentDiff+ulpDecimal <= targetDiff+ulpDecimal/2+ulpBinary { + // we have two choices, and don't know what to do. + return false + } + if currentDiff < ulpBinary || currentDiff > maxDiff-ulpBinary { + // we went too far + return false + } + if d.nd == 1 && d.d[0] == '0' { + // the number has actually reached zero. + d.nd = 0 + d.dp = 0 + } + return true +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/internal/ftoa.go b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/ftoa.go new file mode 100644 index 000000000..253f83b45 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/internal/ftoa.go @@ -0,0 +1,475 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Binary to decimal floating point conversion. +// Algorithm: +// 1) store mantissa in multiprecision decimal +// 2) shift decimal by exponent +// 3) read digits out & format + +package internal + +import "math" + +// TODO: move elsewhere? +type floatInfo struct { + mantbits uint + expbits uint + bias int +} + +var float32info = floatInfo{23, 8, -127} +var float64info = floatInfo{52, 11, -1023} + +// FormatFloat converts the floating-point number f to a string, +// according to the format fmt and precision prec. It rounds the +// result assuming that the original was obtained from a floating-point +// value of bitSize bits (32 for float32, 64 for float64). +// +// The format fmt is one of +// 'b' (-ddddp±ddd, a binary exponent), +// 'e' (-d.dddde±dd, a decimal exponent), +// 'E' (-d.ddddE±dd, a decimal exponent), +// 'f' (-ddd.dddd, no exponent), +// 'g' ('e' for large exponents, 'f' otherwise), or +// 'G' ('E' for large exponents, 'f' otherwise). +// +// The precision prec controls the number of digits +// (excluding the exponent) printed by the 'e', 'E', 'f', 'g', and 'G' formats. +// For 'e', 'E', and 'f' it is the number of digits after the decimal point. +// For 'g' and 'G' it is the total number of digits. +// The special precision -1 uses the smallest number of digits +// necessary such that ParseFloat will return f exactly. +func formatFloat(f float64, fmt byte, prec, bitSize int) string { + return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize)) +} + +// AppendFloat appends the string form of the floating-point number f, +// as generated by FormatFloat, to dst and returns the extended buffer. +func appendFloat(dst []byte, f float64, fmt byte, prec int, bitSize int) []byte { + return genericFtoa(dst, f, fmt, prec, bitSize) +} + +func genericFtoa(dst []byte, val float64, fmt byte, prec, bitSize int) []byte { + var bits uint64 + var flt *floatInfo + switch bitSize { + case 32: + bits = uint64(math.Float32bits(float32(val))) + flt = &float32info + case 64: + bits = math.Float64bits(val) + flt = &float64info + default: + panic("strconv: illegal AppendFloat/FormatFloat bitSize") + } + + neg := bits>>(flt.expbits+flt.mantbits) != 0 + exp := int(bits>>flt.mantbits) & (1<<flt.expbits - 1) + mant := bits & (uint64(1)<<flt.mantbits - 1) + + switch exp { + case 1<<flt.expbits - 1: + // Inf, NaN + var s string + switch { + case mant != 0: + s = "NaN" + case neg: + s = "-Inf" + default: + s = "+Inf" + } + return append(dst, s...) + + case 0: + // denormalized + exp++ + + default: + // add implicit top bit + mant |= uint64(1) << flt.mantbits + } + exp += flt.bias + + // Pick off easy binary format. + if fmt == 'b' { + return fmtB(dst, neg, mant, exp, flt) + } + + if !optimize { + return bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + } + + var digs decimalSlice + ok := false + // Negative precision means "only as much as needed to be exact." + shortest := prec < 0 + if shortest { + // Try Grisu3 algorithm. + f := new(extFloat) + lower, upper := f.AssignComputeBounds(mant, exp, neg, flt) + var buf [32]byte + digs.d = buf[:] + ok = f.ShortestDecimal(&digs, &lower, &upper) + if !ok { + return bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + } + // Precision for shortest representation mode. + switch fmt { + case 'e', 'E': + prec = digs.nd - 1 + case 'f': + prec = max(digs.nd-digs.dp, 0) + case 'g', 'G': + prec = digs.nd + } + } else if fmt != 'f' { + // Fixed number of digits. + digits := prec + switch fmt { + case 'e', 'E': + digits++ + case 'g', 'G': + if prec == 0 { + prec = 1 + } + digits = prec + } + if digits <= 15 { + // try fast algorithm when the number of digits is reasonable. + var buf [24]byte + digs.d = buf[:] + f := extFloat{mant, exp - int(flt.mantbits), neg} + ok = f.FixedDecimal(&digs, digits) + } + } + if !ok { + return bigFtoa(dst, prec, fmt, neg, mant, exp, flt) + } + return formatDigits(dst, shortest, neg, digs, prec, fmt) +} + +// bigFtoa uses multiprecision computations to format a float. +func bigFtoa(dst []byte, prec int, fmt byte, neg bool, mant uint64, exp int, flt *floatInfo) []byte { + d := new(decimal) + d.Assign(mant) + d.Shift(exp - int(flt.mantbits)) + var digs decimalSlice + shortest := prec < 0 + if shortest { + roundShortest(d, mant, exp, flt) + digs = decimalSlice{d: d.d[:], nd: d.nd, dp: d.dp} + // Precision for shortest representation mode. + switch fmt { + case 'e', 'E': + prec = digs.nd - 1 + case 'f': + prec = max(digs.nd-digs.dp, 0) + case 'g', 'G': + prec = digs.nd + } + } else { + // Round appropriately. + switch fmt { + case 'e', 'E': + d.Round(prec + 1) + case 'f': + d.Round(d.dp + prec) + case 'g', 'G': + if prec == 0 { + prec = 1 + } + d.Round(prec) + } + digs = decimalSlice{d: d.d[:], nd: d.nd, dp: d.dp} + } + return formatDigits(dst, shortest, neg, digs, prec, fmt) +} + +func formatDigits(dst []byte, shortest bool, neg bool, digs decimalSlice, prec int, fmt byte) []byte { + switch fmt { + case 'e', 'E': + return fmtE(dst, neg, digs, prec, fmt) + case 'f': + return fmtF(dst, neg, digs, prec) + case 'g', 'G': + // trailing fractional zeros in 'e' form will be trimmed. + eprec := prec + if eprec > digs.nd && digs.nd >= digs.dp { + eprec = digs.nd + } + // %e is used if the exponent from the conversion + // is less than -4 or greater than or equal to the precision. + // if precision was the shortest possible, use precision 6 for this decision. + if shortest { + eprec = 6 + } + exp := digs.dp - 1 + if exp < -4 || exp >= eprec { + if prec > digs.nd { + prec = digs.nd + } + return fmtE(dst, neg, digs, prec-1, fmt+'e'-'g') + } + if prec > digs.dp { + prec = digs.nd + } + return fmtF(dst, neg, digs, max(prec-digs.dp, 0)) + } + + // unknown format + return append(dst, '%', fmt) +} + +// Round d (= mant * 2^exp) to the shortest number of digits +// that will let the original floating point value be precisely +// reconstructed. Size is original floating point size (64 or 32). +func roundShortest(d *decimal, mant uint64, exp int, flt *floatInfo) { + // If mantissa is zero, the number is zero; stop now. + if mant == 0 { + d.nd = 0 + return + } + + // Compute upper and lower such that any decimal number + // between upper and lower (possibly inclusive) + // will round to the original floating point number. + + // We may see at once that the number is already shortest. + // + // Suppose d is not denormal, so that 2^exp <= d < 10^dp. + // The closest shorter number is at least 10^(dp-nd) away. + // The lower/upper bounds computed below are at distance + // at most 2^(exp-mantbits). + // + // So the number is already shortest if 10^(dp-nd) > 2^(exp-mantbits), + // or equivalently log2(10)*(dp-nd) > exp-mantbits. + // It is true if 332/100*(dp-nd) >= exp-mantbits (log2(10) > 3.32). + minexp := flt.bias + 1 // minimum possible exponent + if exp > minexp && 332*(d.dp-d.nd) >= 100*(exp-int(flt.mantbits)) { + // The number is already shortest. + return + } + + // d = mant << (exp - mantbits) + // Next highest floating point number is mant+1 << exp-mantbits. + // Our upper bound is halfway between, mant*2+1 << exp-mantbits-1. + upper := new(decimal) + upper.Assign(mant*2 + 1) + upper.Shift(exp - int(flt.mantbits) - 1) + + // d = mant << (exp - mantbits) + // Next lowest floating point number is mant-1 << exp-mantbits, + // unless mant-1 drops the significant bit and exp is not the minimum exp, + // in which case the next lowest is mant*2-1 << exp-mantbits-1. + // Either way, call it mantlo << explo-mantbits. + // Our lower bound is halfway between, mantlo*2+1 << explo-mantbits-1. + var mantlo uint64 + var explo int + if mant > 1<<flt.mantbits || exp == minexp { + mantlo = mant - 1 + explo = exp + } else { + mantlo = mant*2 - 1 + explo = exp - 1 + } + lower := new(decimal) + lower.Assign(mantlo*2 + 1) + lower.Shift(explo - int(flt.mantbits) - 1) + + // The upper and lower bounds are possible outputs only if + // the original mantissa is even, so that IEEE round-to-even + // would round to the original mantissa and not the neighbors. + inclusive := mant%2 == 0 + + // Now we can figure out the minimum number of digits required. + // Walk along until d has distinguished itself from upper and lower. + for i := 0; i < d.nd; i++ { + var l, m, u byte // lower, middle, upper digits + if i < lower.nd { + l = lower.d[i] + } else { + l = '0' + } + m = d.d[i] + if i < upper.nd { + u = upper.d[i] + } else { + u = '0' + } + + // Okay to round down (truncate) if lower has a different digit + // or if lower is inclusive and is exactly the result of rounding down. + okdown := l != m || (inclusive && l == m && i+1 == lower.nd) + + // Okay to round up if upper has a different digit and + // either upper is inclusive or upper is bigger than the result of rounding up. + okup := m != u && (inclusive || m+1 < u || i+1 < upper.nd) + + // If it's okay to do either, then round to the nearest one. + // If it's okay to do only one, do it. + switch { + case okdown && okup: + d.Round(i + 1) + return + case okdown: + d.RoundDown(i + 1) + return + case okup: + d.RoundUp(i + 1) + return + } + } +} + +type decimalSlice struct { + d []byte + nd, dp int + neg bool +} + +// %e: -d.ddddde±dd +func fmtE(dst []byte, neg bool, d decimalSlice, prec int, fmt byte) []byte { + // sign + if neg { + dst = append(dst, '-') + } + + // first digit + ch := byte('0') + if d.nd != 0 { + ch = d.d[0] + } + dst = append(dst, ch) + + // .moredigits + if prec > 0 { + dst = append(dst, '.') + i := 1 + m := d.nd + prec + 1 - max(d.nd, prec+1) + for i < m { + dst = append(dst, d.d[i]) + i++ + } + for i <= prec { + dst = append(dst, '0') + i++ + } + } + + // e± + dst = append(dst, fmt) + exp := d.dp - 1 + if d.nd == 0 { // special case: 0 has exponent 0 + exp = 0 + } + if exp < 0 { + ch = '-' + exp = -exp + } else { + ch = '+' + } + dst = append(dst, ch) + + // dddd + var buf [3]byte + i := len(buf) + for exp >= 10 { + i-- + buf[i] = byte(exp%10 + '0') + exp /= 10 + } + // exp < 10 + i-- + buf[i] = byte(exp + '0') + + switch i { + case 0: + dst = append(dst, buf[0], buf[1], buf[2]) + case 1: + dst = append(dst, buf[1], buf[2]) + case 2: + // leading zeroes + dst = append(dst, '0', buf[2]) + } + return dst +} + +// %f: -ddddddd.ddddd +func fmtF(dst []byte, neg bool, d decimalSlice, prec int) []byte { + // sign + if neg { + dst = append(dst, '-') + } + + // integer, padded with zeros as needed. + if d.dp > 0 { + var i int + for i = 0; i < d.dp && i < d.nd; i++ { + dst = append(dst, d.d[i]) + } + for ; i < d.dp; i++ { + dst = append(dst, '0') + } + } else { + dst = append(dst, '0') + } + + // fraction + if prec > 0 { + dst = append(dst, '.') + for i := 0; i < prec; i++ { + ch := byte('0') + if j := d.dp + i; 0 <= j && j < d.nd { + ch = d.d[j] + } + dst = append(dst, ch) + } + } + + return dst +} + +// %b: -ddddddddp+ddd +func fmtB(dst []byte, neg bool, mant uint64, exp int, flt *floatInfo) []byte { + var buf [50]byte + w := len(buf) + exp -= int(flt.mantbits) + esign := byte('+') + if exp < 0 { + esign = '-' + exp = -exp + } + n := 0 + for exp > 0 || n < 1 { + n++ + w-- + buf[w] = byte(exp%10 + '0') + exp /= 10 + } + w-- + buf[w] = esign + w-- + buf[w] = 'p' + n = 0 + for mant > 0 || n < 1 { + n++ + w-- + buf[w] = byte(mant%10 + '0') + mant /= 10 + } + if neg { + w-- + buf[w] = '-' + } + return append(dst, buf[w:]...) +} + +func max(a, b int) int { + if a > b { + return a + } + return b +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/iota.go b/vendor/github.com/pquerna/ffjson/fflib/v1/iota.go new file mode 100644 index 000000000..3e50f0c41 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/iota.go @@ -0,0 +1,161 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's strconv/iota.go */ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +import ( + "io" +) + +const ( + digits = "0123456789abcdefghijklmnopqrstuvwxyz" + digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789" + digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999" +) + +var shifts = [len(digits) + 1]uint{ + 1 << 1: 1, + 1 << 2: 2, + 1 << 3: 3, + 1 << 4: 4, + 1 << 5: 5, +} + +var smallNumbers = [][]byte{ + []byte("0"), + []byte("1"), + []byte("2"), + []byte("3"), + []byte("4"), + []byte("5"), + []byte("6"), + []byte("7"), + []byte("8"), + []byte("9"), + []byte("10"), +} + +type FormatBitsWriter interface { + io.Writer + io.ByteWriter +} + +type FormatBitsScratch struct{} + +// +// DEPRECIATED: `scratch` is no longer used, FormatBits2 is available. +// +// FormatBits computes the string representation of u in the given base. +// If neg is set, u is treated as negative int64 value. If append_ is +// set, the string is appended to dst and the resulting byte slice is +// returned as the first result value; otherwise the string is returned +// as the second result value. +// +func FormatBits(scratch *FormatBitsScratch, dst FormatBitsWriter, u uint64, base int, neg bool) { + FormatBits2(dst, u, base, neg) +} + +// FormatBits2 computes the string representation of u in the given base. +// If neg is set, u is treated as negative int64 value. If append_ is +// set, the string is appended to dst and the resulting byte slice is +// returned as the first result value; otherwise the string is returned +// as the second result value. +// +func FormatBits2(dst FormatBitsWriter, u uint64, base int, neg bool) { + if base < 2 || base > len(digits) { + panic("strconv: illegal AppendInt/FormatInt base") + } + // fast path for small common numbers + if u <= 10 { + if neg { + dst.WriteByte('-') + } + dst.Write(smallNumbers[u]) + return + } + + // 2 <= base && base <= len(digits) + + var a = makeSlice(65) + // var a [64 + 1]byte // +1 for sign of 64bit value in base 2 + i := len(a) + + if neg { + u = -u + } + + // convert bits + if base == 10 { + // common case: use constants for / and % because + // the compiler can optimize it into a multiply+shift, + // and unroll loop + for u >= 100 { + i -= 2 + q := u / 100 + j := uintptr(u - q*100) + a[i+1] = digits01[j] + a[i+0] = digits10[j] + u = q + } + if u >= 10 { + i-- + q := u / 10 + a[i] = digits[uintptr(u-q*10)] + u = q + } + + } else if s := shifts[base]; s > 0 { + // base is power of 2: use shifts and masks instead of / and % + b := uint64(base) + m := uintptr(b) - 1 // == 1<<s - 1 + for u >= b { + i-- + a[i] = digits[uintptr(u)&m] + u >>= s + } + + } else { + // general case + b := uint64(base) + for u >= b { + i-- + a[i] = digits[uintptr(u%b)] + u /= b + } + } + + // u < base + i-- + a[i] = digits[uintptr(u)] + + // add sign, if any + if neg { + i-- + a[i] = '-' + } + + dst.Write(a[i:]) + + Pool(a) + + return +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/jsonstring.go b/vendor/github.com/pquerna/ffjson/fflib/v1/jsonstring.go new file mode 100644 index 000000000..513b45d57 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/jsonstring.go @@ -0,0 +1,512 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on Go stdlib's encoding/json/encode.go */ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package v1 + +import ( + "io" + "unicode/utf8" + "strconv" + "unicode/utf16" + "unicode" +) + +const hex = "0123456789abcdef" + +type JsonStringWriter interface { + io.Writer + io.ByteWriter + stringWriter +} + +func WriteJsonString(buf JsonStringWriter, s string) { + WriteJson(buf, []byte(s)) +} + +/** + * Function ported from encoding/json: func (e *encodeState) string(s string) (int, error) + */ +func WriteJson(buf JsonStringWriter, s []byte) { + buf.WriteByte('"') + start := 0 + for i := 0; i < len(s); { + if b := s[i]; b < utf8.RuneSelf { + /* + if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' { + i++ + continue + } + */ + if lt[b] == true { + i++ + continue + } + + if start < i { + buf.Write(s[start:i]) + } + switch b { + case '\\', '"': + buf.WriteByte('\\') + buf.WriteByte(b) + case '\n': + buf.WriteByte('\\') + buf.WriteByte('n') + case '\r': + buf.WriteByte('\\') + buf.WriteByte('r') + default: + // This encodes bytes < 0x20 except for \n and \r, + // as well as < and >. The latter are escaped because they + // can lead to security holes when user-controlled strings + // are rendered into JSON and served to some browsers. + buf.WriteString(`\u00`) + buf.WriteByte(hex[b>>4]) + buf.WriteByte(hex[b&0xF]) + } + i++ + start = i + continue + } + c, size := utf8.DecodeRune(s[i:]) + if c == utf8.RuneError && size == 1 { + if start < i { + buf.Write(s[start:i]) + } + buf.WriteString(`\ufffd`) + i += size + start = i + continue + } + // U+2028 is LINE SEPARATOR. + // U+2029 is PARAGRAPH SEPARATOR. + // They are both technically valid characters in JSON strings, + // but don't work in JSONP, which has to be evaluated as JavaScript, + // and can lead to security holes there. It is valid JSON to + // escape them, so we do so unconditionally. + // See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion. + if c == '\u2028' || c == '\u2029' { + if start < i { + buf.Write(s[start:i]) + } + buf.WriteString(`\u202`) + buf.WriteByte(hex[c&0xF]) + i += size + start = i + continue + } + i += size + } + if start < len(s) { + buf.Write(s[start:]) + } + buf.WriteByte('"') +} + +// UnquoteBytes will decode []byte containing json string to go string +// ported from encoding/json/decode.go +func UnquoteBytes(s []byte) (t []byte, ok bool) { + if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' { + return + } + s = s[1 : len(s)-1] + + // Check for unusual characters. If there are none, + // then no unquoting is needed, so return a slice of the + // original bytes. + r := 0 + for r < len(s) { + c := s[r] + if c == '\\' || c == '"' || c < ' ' { + break + } + if c < utf8.RuneSelf { + r++ + continue + } + rr, size := utf8.DecodeRune(s[r:]) + if rr == utf8.RuneError && size == 1 { + break + } + r += size + } + if r == len(s) { + return s, true + } + + b := make([]byte, len(s)+2*utf8.UTFMax) + w := copy(b, s[0:r]) + for r < len(s) { + // Out of room? Can only happen if s is full of + // malformed UTF-8 and we're replacing each + // byte with RuneError. + if w >= len(b)-2*utf8.UTFMax { + nb := make([]byte, (len(b)+utf8.UTFMax)*2) + copy(nb, b[0:w]) + b = nb + } + switch c := s[r]; { + case c == '\\': + r++ + if r >= len(s) { + return + } + switch s[r] { + default: + return + case '"', '\\', '/', '\'': + b[w] = s[r] + r++ + w++ + case 'b': + b[w] = '\b' + r++ + w++ + case 'f': + b[w] = '\f' + r++ + w++ + case 'n': + b[w] = '\n' + r++ + w++ + case 'r': + b[w] = '\r' + r++ + w++ + case 't': + b[w] = '\t' + r++ + w++ + case 'u': + r-- + rr := getu4(s[r:]) + if rr < 0 { + return + } + r += 6 + if utf16.IsSurrogate(rr) { + rr1 := getu4(s[r:]) + if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar { + // A valid pair; consume. + r += 6 + w += utf8.EncodeRune(b[w:], dec) + break + } + // Invalid surrogate; fall back to replacement rune. + rr = unicode.ReplacementChar + } + w += utf8.EncodeRune(b[w:], rr) + } + + // Quote, control characters are invalid. + case c == '"', c < ' ': + return + + // ASCII + case c < utf8.RuneSelf: + b[w] = c + r++ + w++ + + // Coerce to well-formed UTF-8. + default: + rr, size := utf8.DecodeRune(s[r:]) + r += size + w += utf8.EncodeRune(b[w:], rr) + } + } + return b[0:w], true +} + +// getu4 decodes \uXXXX from the beginning of s, returning the hex value, +// or it returns -1. +func getu4(s []byte) rune { + if len(s) < 6 || s[0] != '\\' || s[1] != 'u' { + return -1 + } + r, err := strconv.ParseUint(string(s[2:6]), 16, 64) + if err != nil { + return -1 + } + return rune(r) +} + +// TODO(pquerna): consider combining wibth the normal byte mask. +var lt [256]bool = [256]bool{ + false, /* 0 */ + false, /* 1 */ + false, /* 2 */ + false, /* 3 */ + false, /* 4 */ + false, /* 5 */ + false, /* 6 */ + false, /* 7 */ + false, /* 8 */ + false, /* 9 */ + false, /* 10 */ + false, /* 11 */ + false, /* 12 */ + false, /* 13 */ + false, /* 14 */ + false, /* 15 */ + false, /* 16 */ + false, /* 17 */ + false, /* 18 */ + false, /* 19 */ + false, /* 20 */ + false, /* 21 */ + false, /* 22 */ + false, /* 23 */ + false, /* 24 */ + false, /* 25 */ + false, /* 26 */ + false, /* 27 */ + false, /* 28 */ + false, /* 29 */ + false, /* 30 */ + false, /* 31 */ + true, /* 32 */ + true, /* 33 */ + false, /* 34 */ + true, /* 35 */ + true, /* 36 */ + true, /* 37 */ + false, /* 38 */ + true, /* 39 */ + true, /* 40 */ + true, /* 41 */ + true, /* 42 */ + true, /* 43 */ + true, /* 44 */ + true, /* 45 */ + true, /* 46 */ + true, /* 47 */ + true, /* 48 */ + true, /* 49 */ + true, /* 50 */ + true, /* 51 */ + true, /* 52 */ + true, /* 53 */ + true, /* 54 */ + true, /* 55 */ + true, /* 56 */ + true, /* 57 */ + true, /* 58 */ + true, /* 59 */ + false, /* 60 */ + true, /* 61 */ + false, /* 62 */ + true, /* 63 */ + true, /* 64 */ + true, /* 65 */ + true, /* 66 */ + true, /* 67 */ + true, /* 68 */ + true, /* 69 */ + true, /* 70 */ + true, /* 71 */ + true, /* 72 */ + true, /* 73 */ + true, /* 74 */ + true, /* 75 */ + true, /* 76 */ + true, /* 77 */ + true, /* 78 */ + true, /* 79 */ + true, /* 80 */ + true, /* 81 */ + true, /* 82 */ + true, /* 83 */ + true, /* 84 */ + true, /* 85 */ + true, /* 86 */ + true, /* 87 */ + true, /* 88 */ + true, /* 89 */ + true, /* 90 */ + true, /* 91 */ + false, /* 92 */ + true, /* 93 */ + true, /* 94 */ + true, /* 95 */ + true, /* 96 */ + true, /* 97 */ + true, /* 98 */ + true, /* 99 */ + true, /* 100 */ + true, /* 101 */ + true, /* 102 */ + true, /* 103 */ + true, /* 104 */ + true, /* 105 */ + true, /* 106 */ + true, /* 107 */ + true, /* 108 */ + true, /* 109 */ + true, /* 110 */ + true, /* 111 */ + true, /* 112 */ + true, /* 113 */ + true, /* 114 */ + true, /* 115 */ + true, /* 116 */ + true, /* 117 */ + true, /* 118 */ + true, /* 119 */ + true, /* 120 */ + true, /* 121 */ + true, /* 122 */ + true, /* 123 */ + true, /* 124 */ + true, /* 125 */ + true, /* 126 */ + true, /* 127 */ + true, /* 128 */ + true, /* 129 */ + true, /* 130 */ + true, /* 131 */ + true, /* 132 */ + true, /* 133 */ + true, /* 134 */ + true, /* 135 */ + true, /* 136 */ + true, /* 137 */ + true, /* 138 */ + true, /* 139 */ + true, /* 140 */ + true, /* 141 */ + true, /* 142 */ + true, /* 143 */ + true, /* 144 */ + true, /* 145 */ + true, /* 146 */ + true, /* 147 */ + true, /* 148 */ + true, /* 149 */ + true, /* 150 */ + true, /* 151 */ + true, /* 152 */ + true, /* 153 */ + true, /* 154 */ + true, /* 155 */ + true, /* 156 */ + true, /* 157 */ + true, /* 158 */ + true, /* 159 */ + true, /* 160 */ + true, /* 161 */ + true, /* 162 */ + true, /* 163 */ + true, /* 164 */ + true, /* 165 */ + true, /* 166 */ + true, /* 167 */ + true, /* 168 */ + true, /* 169 */ + true, /* 170 */ + true, /* 171 */ + true, /* 172 */ + true, /* 173 */ + true, /* 174 */ + true, /* 175 */ + true, /* 176 */ + true, /* 177 */ + true, /* 178 */ + true, /* 179 */ + true, /* 180 */ + true, /* 181 */ + true, /* 182 */ + true, /* 183 */ + true, /* 184 */ + true, /* 185 */ + true, /* 186 */ + true, /* 187 */ + true, /* 188 */ + true, /* 189 */ + true, /* 190 */ + true, /* 191 */ + true, /* 192 */ + true, /* 193 */ + true, /* 194 */ + true, /* 195 */ + true, /* 196 */ + true, /* 197 */ + true, /* 198 */ + true, /* 199 */ + true, /* 200 */ + true, /* 201 */ + true, /* 202 */ + true, /* 203 */ + true, /* 204 */ + true, /* 205 */ + true, /* 206 */ + true, /* 207 */ + true, /* 208 */ + true, /* 209 */ + true, /* 210 */ + true, /* 211 */ + true, /* 212 */ + true, /* 213 */ + true, /* 214 */ + true, /* 215 */ + true, /* 216 */ + true, /* 217 */ + true, /* 218 */ + true, /* 219 */ + true, /* 220 */ + true, /* 221 */ + true, /* 222 */ + true, /* 223 */ + true, /* 224 */ + true, /* 225 */ + true, /* 226 */ + true, /* 227 */ + true, /* 228 */ + true, /* 229 */ + true, /* 230 */ + true, /* 231 */ + true, /* 232 */ + true, /* 233 */ + true, /* 234 */ + true, /* 235 */ + true, /* 236 */ + true, /* 237 */ + true, /* 238 */ + true, /* 239 */ + true, /* 240 */ + true, /* 241 */ + true, /* 242 */ + true, /* 243 */ + true, /* 244 */ + true, /* 245 */ + true, /* 246 */ + true, /* 247 */ + true, /* 248 */ + true, /* 249 */ + true, /* 250 */ + true, /* 251 */ + true, /* 252 */ + true, /* 253 */ + true, /* 254 */ + true, /* 255 */ +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/lexer.go b/vendor/github.com/pquerna/ffjson/fflib/v1/lexer.go new file mode 100644 index 000000000..8ffd54be5 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/lexer.go @@ -0,0 +1,937 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +/* Portions of this file are on derived from yajl: <https://github.com/lloyd/yajl> */ +/* + * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +package v1 + +import ( + "errors" + "fmt" + "io" +) + +type FFParseState int + +const ( + FFParse_map_start FFParseState = iota + FFParse_want_key + FFParse_want_colon + FFParse_want_value + FFParse_after_value +) + +type FFTok int + +const ( + FFTok_init FFTok = iota + FFTok_bool FFTok = iota + FFTok_colon FFTok = iota + FFTok_comma FFTok = iota + FFTok_eof FFTok = iota + FFTok_error FFTok = iota + FFTok_left_brace FFTok = iota + FFTok_left_bracket FFTok = iota + FFTok_null FFTok = iota + FFTok_right_brace FFTok = iota + FFTok_right_bracket FFTok = iota + + /* we differentiate between integers and doubles to allow the + * parser to interpret the number without re-scanning */ + FFTok_integer FFTok = iota + FFTok_double FFTok = iota + + FFTok_string FFTok = iota + + /* comment tokens are not currently returned to the parser, ever */ + FFTok_comment FFTok = iota +) + +type FFErr int + +const ( + FFErr_e_ok FFErr = iota + FFErr_io FFErr = iota + FFErr_string_invalid_utf8 FFErr = iota + FFErr_string_invalid_escaped_char FFErr = iota + FFErr_string_invalid_json_char FFErr = iota + FFErr_string_invalid_hex_char FFErr = iota + FFErr_invalid_char FFErr = iota + FFErr_invalid_string FFErr = iota + FFErr_missing_integer_after_decimal FFErr = iota + FFErr_missing_integer_after_exponent FFErr = iota + FFErr_missing_integer_after_minus FFErr = iota + FFErr_unallowed_comment FFErr = iota + FFErr_incomplete_comment FFErr = iota + FFErr_unexpected_token_type FFErr = iota // TODO: improve this error +) + +type FFLexer struct { + reader *ffReader + Output DecodingBuffer + Token FFTok + Error FFErr + BigError error + // TODO: convert all of this to an interface + lastCurrentChar int + captureAll bool + buf Buffer +} + +func NewFFLexer(input []byte) *FFLexer { + fl := &FFLexer{ + Token: FFTok_init, + Error: FFErr_e_ok, + reader: newffReader(input), + Output: &Buffer{}, + } + // TODO: guess size? + //fl.Output.Grow(64) + return fl +} + +type LexerError struct { + offset int + line int + char int + err error +} + +// Reset the Lexer and add new input. +func (ffl *FFLexer) Reset(input []byte) { + ffl.Token = FFTok_init + ffl.Error = FFErr_e_ok + ffl.BigError = nil + ffl.reader.Reset(input) + ffl.lastCurrentChar = 0 + ffl.Output.Reset() +} + +func (le *LexerError) Error() string { + return fmt.Sprintf(`ffjson error: (%T)%s offset=%d line=%d char=%d`, + le.err, le.err.Error(), + le.offset, le.line, le.char) +} + +func (ffl *FFLexer) WrapErr(err error) error { + line, char := ffl.reader.PosWithLine() + // TOOD: calcualte lines/characters based on offset + return &LexerError{ + offset: ffl.reader.Pos(), + line: line, + char: char, + err: err, + } +} + +func (ffl *FFLexer) scanReadByte() (byte, error) { + var c byte + var err error + if ffl.captureAll { + c, err = ffl.reader.ReadByte() + } else { + c, err = ffl.reader.ReadByteNoWS() + } + + if err != nil { + ffl.Error = FFErr_io + ffl.BigError = err + return 0, err + } + + return c, nil +} + +func (ffl *FFLexer) readByte() (byte, error) { + + c, err := ffl.reader.ReadByte() + if err != nil { + ffl.Error = FFErr_io + ffl.BigError = err + return 0, err + } + + return c, nil +} + +func (ffl *FFLexer) unreadByte() { + ffl.reader.UnreadByte() +} + +func (ffl *FFLexer) wantBytes(want []byte, iftrue FFTok) FFTok { + startPos := ffl.reader.Pos() + for _, b := range want { + c, err := ffl.readByte() + + if err != nil { + return FFTok_error + } + + if c != b { + ffl.unreadByte() + // fmt.Printf("wanted bytes: %s\n", string(want)) + // TODO(pquerna): thsi is a bad error message + ffl.Error = FFErr_invalid_string + return FFTok_error + } + } + + endPos := ffl.reader.Pos() + ffl.Output.Write(ffl.reader.Slice(startPos, endPos)) + return iftrue +} + +func (ffl *FFLexer) lexComment() FFTok { + c, err := ffl.readByte() + if err != nil { + return FFTok_error + } + + if c == '/' { + // a // comment, scan until line ends. + for { + c, err := ffl.readByte() + if err != nil { + return FFTok_error + } + + if c == '\n' { + return FFTok_comment + } + } + } else if c == '*' { + // a /* */ comment, scan */ + for { + c, err := ffl.readByte() + if err != nil { + return FFTok_error + } + + if c == '*' { + c, err := ffl.readByte() + + if err != nil { + return FFTok_error + } + + if c == '/' { + return FFTok_comment + } + + ffl.Error = FFErr_incomplete_comment + return FFTok_error + } + } + } else { + ffl.Error = FFErr_incomplete_comment + return FFTok_error + } +} + +func (ffl *FFLexer) lexString() FFTok { + if ffl.captureAll { + ffl.buf.Reset() + err := ffl.reader.SliceString(&ffl.buf) + + if err != nil { + ffl.BigError = err + return FFTok_error + } + + WriteJson(ffl.Output, ffl.buf.Bytes()) + + return FFTok_string + } else { + err := ffl.reader.SliceString(ffl.Output) + + if err != nil { + ffl.BigError = err + return FFTok_error + } + + return FFTok_string + } +} + +func (ffl *FFLexer) lexNumber() FFTok { + var numRead int = 0 + tok := FFTok_integer + startPos := ffl.reader.Pos() + + c, err := ffl.readByte() + if err != nil { + return FFTok_error + } + + /* optional leading minus */ + if c == '-' { + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } + + /* a single zero, or a series of integers */ + if c == '0' { + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } else if c >= '1' && c <= '9' { + for c >= '0' && c <= '9' { + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } + } else { + ffl.unreadByte() + ffl.Error = FFErr_missing_integer_after_minus + return FFTok_error + } + + if c == '.' { + numRead = 0 + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + + for c >= '0' && c <= '9' { + numRead++ + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } + + if numRead == 0 { + ffl.unreadByte() + + ffl.Error = FFErr_missing_integer_after_decimal + return FFTok_error + } + + tok = FFTok_double + } + + /* optional exponent (indicates this is floating point) */ + if c == 'e' || c == 'E' { + numRead = 0 + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + + /* optional sign */ + if c == '+' || c == '-' { + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } + + for c >= '0' && c <= '9' { + numRead++ + c, err = ffl.readByte() + if err != nil { + return FFTok_error + } + } + + if numRead == 0 { + ffl.Error = FFErr_missing_integer_after_exponent + return FFTok_error + } + + tok = FFTok_double + } + + ffl.unreadByte() + + endPos := ffl.reader.Pos() + ffl.Output.Write(ffl.reader.Slice(startPos, endPos)) + return tok +} + +var true_bytes = []byte{'r', 'u', 'e'} +var false_bytes = []byte{'a', 'l', 's', 'e'} +var null_bytes = []byte{'u', 'l', 'l'} + +func (ffl *FFLexer) Scan() FFTok { + tok := FFTok_error + if ffl.captureAll == false { + ffl.Output.Reset() + } + ffl.Token = FFTok_init + + for { + c, err := ffl.scanReadByte() + if err != nil { + if err == io.EOF { + return FFTok_eof + } else { + return FFTok_error + } + } + + switch c { + case '{': + tok = FFTok_left_bracket + if ffl.captureAll { + ffl.Output.WriteByte('{') + } + goto lexed + case '}': + tok = FFTok_right_bracket + if ffl.captureAll { + ffl.Output.WriteByte('}') + } + goto lexed + case '[': + tok = FFTok_left_brace + if ffl.captureAll { + ffl.Output.WriteByte('[') + } + goto lexed + case ']': + tok = FFTok_right_brace + if ffl.captureAll { + ffl.Output.WriteByte(']') + } + goto lexed + case ',': + tok = FFTok_comma + if ffl.captureAll { + ffl.Output.WriteByte(',') + } + goto lexed + case ':': + tok = FFTok_colon + if ffl.captureAll { + ffl.Output.WriteByte(':') + } + goto lexed + case '\t', '\n', '\v', '\f', '\r', ' ': + if ffl.captureAll { + ffl.Output.WriteByte(c) + } + break + case 't': + ffl.Output.WriteByte('t') + tok = ffl.wantBytes(true_bytes, FFTok_bool) + goto lexed + case 'f': + ffl.Output.WriteByte('f') + tok = ffl.wantBytes(false_bytes, FFTok_bool) + goto lexed + case 'n': + ffl.Output.WriteByte('n') + tok = ffl.wantBytes(null_bytes, FFTok_null) + goto lexed + case '"': + tok = ffl.lexString() + goto lexed + case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9': + ffl.unreadByte() + tok = ffl.lexNumber() + goto lexed + case '/': + tok = ffl.lexComment() + goto lexed + default: + tok = FFTok_error + ffl.Error = FFErr_invalid_char + } + } + +lexed: + ffl.Token = tok + return tok +} + +func (ffl *FFLexer) scanField(start FFTok, capture bool) ([]byte, error) { + switch start { + case FFTok_left_brace, + FFTok_left_bracket: + { + end := FFTok_right_brace + if start == FFTok_left_bracket { + end = FFTok_right_bracket + if capture { + ffl.Output.WriteByte('{') + } + } else { + if capture { + ffl.Output.WriteByte('[') + } + } + + depth := 1 + if capture { + ffl.captureAll = true + } + // TODO: work. + scanloop: + for { + tok := ffl.Scan() + //fmt.Printf("capture-token: %v end: %v depth: %v\n", tok, end, depth) + switch tok { + case FFTok_eof: + return nil, errors.New("ffjson: unexpected EOF") + case FFTok_error: + if ffl.BigError != nil { + return nil, ffl.BigError + } + return nil, ffl.Error.ToError() + case end: + depth-- + if depth == 0 { + break scanloop + } + case start: + depth++ + } + } + + if capture { + ffl.captureAll = false + } + + if capture { + return ffl.Output.Bytes(), nil + } else { + return nil, nil + } + } + case FFTok_bool, + FFTok_integer, + FFTok_null, + FFTok_double: + // simple value, return it. + if capture { + return ffl.Output.Bytes(), nil + } else { + return nil, nil + } + + case FFTok_string: + //TODO(pquerna): so, other users expect this to be a quoted string :( + if capture { + ffl.buf.Reset() + WriteJson(&ffl.buf, ffl.Output.Bytes()) + return ffl.buf.Bytes(), nil + } else { + return nil, nil + } + } + + return nil, fmt.Errorf("ffjson: invalid capture type: %v", start) +} + +// Captures an entire field value, including recursive objects, +// and converts them to a []byte suitable to pass to a sub-object's +// UnmarshalJSON +func (ffl *FFLexer) CaptureField(start FFTok) ([]byte, error) { + return ffl.scanField(start, true) +} + +func (ffl *FFLexer) SkipField(start FFTok) error { + _, err := ffl.scanField(start, false) + return err +} + +// TODO(pquerna): return line number and offset. +func (err FFErr) ToError() error { + switch err { + case FFErr_e_ok: + return nil + case FFErr_io: + return errors.New("ffjson: IO error") + case FFErr_string_invalid_utf8: + return errors.New("ffjson: string with invalid UTF-8 sequence") + case FFErr_string_invalid_escaped_char: + return errors.New("ffjson: string with invalid escaped character") + case FFErr_string_invalid_json_char: + return errors.New("ffjson: string with invalid JSON character") + case FFErr_string_invalid_hex_char: + return errors.New("ffjson: string with invalid hex character") + case FFErr_invalid_char: + return errors.New("ffjson: invalid character") + case FFErr_invalid_string: + return errors.New("ffjson: invalid string") + case FFErr_missing_integer_after_decimal: + return errors.New("ffjson: missing integer after decimal") + case FFErr_missing_integer_after_exponent: + return errors.New("ffjson: missing integer after exponent") + case FFErr_missing_integer_after_minus: + return errors.New("ffjson: missing integer after minus") + case FFErr_unallowed_comment: + return errors.New("ffjson: unallowed comment") + case FFErr_incomplete_comment: + return errors.New("ffjson: incomplete comment") + case FFErr_unexpected_token_type: + return errors.New("ffjson: unexpected token sequence") + } + + panic(fmt.Sprintf("unknown error type: %v ", err)) +} + +func (state FFParseState) String() string { + switch state { + case FFParse_map_start: + return "map:start" + case FFParse_want_key: + return "want_key" + case FFParse_want_colon: + return "want_colon" + case FFParse_want_value: + return "want_value" + case FFParse_after_value: + return "after_value" + } + + panic(fmt.Sprintf("unknown parse state: %d", int(state))) +} + +func (tok FFTok) String() string { + switch tok { + case FFTok_init: + return "tok:init" + case FFTok_bool: + return "tok:bool" + case FFTok_colon: + return "tok:colon" + case FFTok_comma: + return "tok:comma" + case FFTok_eof: + return "tok:eof" + case FFTok_error: + return "tok:error" + case FFTok_left_brace: + return "tok:left_brace" + case FFTok_left_bracket: + return "tok:left_bracket" + case FFTok_null: + return "tok:null" + case FFTok_right_brace: + return "tok:right_brace" + case FFTok_right_bracket: + return "tok:right_bracket" + case FFTok_integer: + return "tok:integer" + case FFTok_double: + return "tok:double" + case FFTok_string: + return "tok:string" + case FFTok_comment: + return "comment" + } + + panic(fmt.Sprintf("unknown token: %d", int(tok))) +} + +/* a lookup table which lets us quickly determine three things: + * cVEC - valid escaped control char + * note. the solidus '/' may be escaped or not. + * cIJC - invalid json char + * cVHC - valid hex char + * cNFP - needs further processing (from a string scanning perspective) + * cNUC - needs utf8 checking when enabled (from a string scanning perspective) + */ + +const ( + cVEC int8 = 0x01 + cIJC int8 = 0x02 + cVHC int8 = 0x04 + cNFP int8 = 0x08 + cNUC int8 = 0x10 +) + +var byteLookupTable [256]int8 = [256]int8{ + cIJC, /* 0 */ + cIJC, /* 1 */ + cIJC, /* 2 */ + cIJC, /* 3 */ + cIJC, /* 4 */ + cIJC, /* 5 */ + cIJC, /* 6 */ + cIJC, /* 7 */ + cIJC, /* 8 */ + cIJC, /* 9 */ + cIJC, /* 10 */ + cIJC, /* 11 */ + cIJC, /* 12 */ + cIJC, /* 13 */ + cIJC, /* 14 */ + cIJC, /* 15 */ + cIJC, /* 16 */ + cIJC, /* 17 */ + cIJC, /* 18 */ + cIJC, /* 19 */ + cIJC, /* 20 */ + cIJC, /* 21 */ + cIJC, /* 22 */ + cIJC, /* 23 */ + cIJC, /* 24 */ + cIJC, /* 25 */ + cIJC, /* 26 */ + cIJC, /* 27 */ + cIJC, /* 28 */ + cIJC, /* 29 */ + cIJC, /* 30 */ + cIJC, /* 31 */ + 0, /* 32 */ + 0, /* 33 */ + cVEC | cIJC | cNFP, /* 34 */ + 0, /* 35 */ + 0, /* 36 */ + 0, /* 37 */ + 0, /* 38 */ + 0, /* 39 */ + 0, /* 40 */ + 0, /* 41 */ + 0, /* 42 */ + 0, /* 43 */ + 0, /* 44 */ + 0, /* 45 */ + 0, /* 46 */ + cVEC, /* 47 */ + cVHC, /* 48 */ + cVHC, /* 49 */ + cVHC, /* 50 */ + cVHC, /* 51 */ + cVHC, /* 52 */ + cVHC, /* 53 */ + cVHC, /* 54 */ + cVHC, /* 55 */ + cVHC, /* 56 */ + cVHC, /* 57 */ + 0, /* 58 */ + 0, /* 59 */ + 0, /* 60 */ + 0, /* 61 */ + 0, /* 62 */ + 0, /* 63 */ + 0, /* 64 */ + cVHC, /* 65 */ + cVHC, /* 66 */ + cVHC, /* 67 */ + cVHC, /* 68 */ + cVHC, /* 69 */ + cVHC, /* 70 */ + 0, /* 71 */ + 0, /* 72 */ + 0, /* 73 */ + 0, /* 74 */ + 0, /* 75 */ + 0, /* 76 */ + 0, /* 77 */ + 0, /* 78 */ + 0, /* 79 */ + 0, /* 80 */ + 0, /* 81 */ + 0, /* 82 */ + 0, /* 83 */ + 0, /* 84 */ + 0, /* 85 */ + 0, /* 86 */ + 0, /* 87 */ + 0, /* 88 */ + 0, /* 89 */ + 0, /* 90 */ + 0, /* 91 */ + cVEC | cIJC | cNFP, /* 92 */ + 0, /* 93 */ + 0, /* 94 */ + 0, /* 95 */ + 0, /* 96 */ + cVHC, /* 97 */ + cVEC | cVHC, /* 98 */ + cVHC, /* 99 */ + cVHC, /* 100 */ + cVHC, /* 101 */ + cVEC | cVHC, /* 102 */ + 0, /* 103 */ + 0, /* 104 */ + 0, /* 105 */ + 0, /* 106 */ + 0, /* 107 */ + 0, /* 108 */ + 0, /* 109 */ + cVEC, /* 110 */ + 0, /* 111 */ + 0, /* 112 */ + 0, /* 113 */ + cVEC, /* 114 */ + 0, /* 115 */ + cVEC, /* 116 */ + 0, /* 117 */ + 0, /* 118 */ + 0, /* 119 */ + 0, /* 120 */ + 0, /* 121 */ + 0, /* 122 */ + 0, /* 123 */ + 0, /* 124 */ + 0, /* 125 */ + 0, /* 126 */ + 0, /* 127 */ + cNUC, /* 128 */ + cNUC, /* 129 */ + cNUC, /* 130 */ + cNUC, /* 131 */ + cNUC, /* 132 */ + cNUC, /* 133 */ + cNUC, /* 134 */ + cNUC, /* 135 */ + cNUC, /* 136 */ + cNUC, /* 137 */ + cNUC, /* 138 */ + cNUC, /* 139 */ + cNUC, /* 140 */ + cNUC, /* 141 */ + cNUC, /* 142 */ + cNUC, /* 143 */ + cNUC, /* 144 */ + cNUC, /* 145 */ + cNUC, /* 146 */ + cNUC, /* 147 */ + cNUC, /* 148 */ + cNUC, /* 149 */ + cNUC, /* 150 */ + cNUC, /* 151 */ + cNUC, /* 152 */ + cNUC, /* 153 */ + cNUC, /* 154 */ + cNUC, /* 155 */ + cNUC, /* 156 */ + cNUC, /* 157 */ + cNUC, /* 158 */ + cNUC, /* 159 */ + cNUC, /* 160 */ + cNUC, /* 161 */ + cNUC, /* 162 */ + cNUC, /* 163 */ + cNUC, /* 164 */ + cNUC, /* 165 */ + cNUC, /* 166 */ + cNUC, /* 167 */ + cNUC, /* 168 */ + cNUC, /* 169 */ + cNUC, /* 170 */ + cNUC, /* 171 */ + cNUC, /* 172 */ + cNUC, /* 173 */ + cNUC, /* 174 */ + cNUC, /* 175 */ + cNUC, /* 176 */ + cNUC, /* 177 */ + cNUC, /* 178 */ + cNUC, /* 179 */ + cNUC, /* 180 */ + cNUC, /* 181 */ + cNUC, /* 182 */ + cNUC, /* 183 */ + cNUC, /* 184 */ + cNUC, /* 185 */ + cNUC, /* 186 */ + cNUC, /* 187 */ + cNUC, /* 188 */ + cNUC, /* 189 */ + cNUC, /* 190 */ + cNUC, /* 191 */ + cNUC, /* 192 */ + cNUC, /* 193 */ + cNUC, /* 194 */ + cNUC, /* 195 */ + cNUC, /* 196 */ + cNUC, /* 197 */ + cNUC, /* 198 */ + cNUC, /* 199 */ + cNUC, /* 200 */ + cNUC, /* 201 */ + cNUC, /* 202 */ + cNUC, /* 203 */ + cNUC, /* 204 */ + cNUC, /* 205 */ + cNUC, /* 206 */ + cNUC, /* 207 */ + cNUC, /* 208 */ + cNUC, /* 209 */ + cNUC, /* 210 */ + cNUC, /* 211 */ + cNUC, /* 212 */ + cNUC, /* 213 */ + cNUC, /* 214 */ + cNUC, /* 215 */ + cNUC, /* 216 */ + cNUC, /* 217 */ + cNUC, /* 218 */ + cNUC, /* 219 */ + cNUC, /* 220 */ + cNUC, /* 221 */ + cNUC, /* 222 */ + cNUC, /* 223 */ + cNUC, /* 224 */ + cNUC, /* 225 */ + cNUC, /* 226 */ + cNUC, /* 227 */ + cNUC, /* 228 */ + cNUC, /* 229 */ + cNUC, /* 230 */ + cNUC, /* 231 */ + cNUC, /* 232 */ + cNUC, /* 233 */ + cNUC, /* 234 */ + cNUC, /* 235 */ + cNUC, /* 236 */ + cNUC, /* 237 */ + cNUC, /* 238 */ + cNUC, /* 239 */ + cNUC, /* 240 */ + cNUC, /* 241 */ + cNUC, /* 242 */ + cNUC, /* 243 */ + cNUC, /* 244 */ + cNUC, /* 245 */ + cNUC, /* 246 */ + cNUC, /* 247 */ + cNUC, /* 248 */ + cNUC, /* 249 */ + cNUC, /* 250 */ + cNUC, /* 251 */ + cNUC, /* 252 */ + cNUC, /* 253 */ + cNUC, /* 254 */ + cNUC, /* 255 */ +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/reader.go b/vendor/github.com/pquerna/ffjson/fflib/v1/reader.go new file mode 100644 index 000000000..0f22c469d --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/reader.go @@ -0,0 +1,512 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +package v1 + +import ( + "fmt" + "io" + "unicode" + "unicode/utf16" +) + +const sliceStringMask = cIJC | cNFP + +type ffReader struct { + s []byte + i int + l int +} + +func newffReader(d []byte) *ffReader { + return &ffReader{ + s: d, + i: 0, + l: len(d), + } +} + +func (r *ffReader) Slice(start, stop int) []byte { + return r.s[start:stop] +} + +func (r *ffReader) Pos() int { + return r.i +} + +// Reset the reader, and add new input. +func (r *ffReader) Reset(d []byte) { + r.s = d + r.i = 0 + r.l = len(d) +} + +// Calcuates the Position with line and line offset, +// because this isn't counted for performance reasons, +// it will iterate the buffer from the beginning, and should +// only be used in error-paths. +func (r *ffReader) PosWithLine() (int, int) { + currentLine := 1 + currentChar := 0 + + for i := 0; i < r.i; i++ { + c := r.s[i] + currentChar++ + if c == '\n' { + currentLine++ + currentChar = 0 + } + } + + return currentLine, currentChar +} + +func (r *ffReader) ReadByteNoWS() (byte, error) { + if r.i >= r.l { + return 0, io.EOF + } + + j := r.i + + for { + c := r.s[j] + j++ + + // inline whitespace parsing gives another ~8% performance boost + // for many kinds of nicely indented JSON. + // ... and using a [255]bool instead of multiple ifs, gives another 2% + /* + if c != '\t' && + c != '\n' && + c != '\v' && + c != '\f' && + c != '\r' && + c != ' ' { + r.i = j + return c, nil + } + */ + if whitespaceLookupTable[c] == false { + r.i = j + return c, nil + } + + if j >= r.l { + return 0, io.EOF + } + } +} + +func (r *ffReader) ReadByte() (byte, error) { + if r.i >= r.l { + return 0, io.EOF + } + + r.i++ + + return r.s[r.i-1], nil +} + +func (r *ffReader) UnreadByte() error { + if r.i <= 0 { + panic("ffReader.UnreadByte: at beginning of slice") + } + r.i-- + return nil +} + +func (r *ffReader) readU4(j int) (rune, error) { + + var u4 [4]byte + for i := 0; i < 4; i++ { + if j >= r.l { + return -1, io.EOF + } + c := r.s[j] + if byteLookupTable[c]&cVHC != 0 { + u4[i] = c + j++ + continue + } else { + // TODO(pquerna): handle errors better. layering violation. + return -1, fmt.Errorf("lex_string_invalid_hex_char: %v %v", c, string(u4[:])) + } + } + + // TODO(pquerna): utf16.IsSurrogate + rr, err := ParseUint(u4[:], 16, 64) + if err != nil { + return -1, err + } + return rune(rr), nil +} + +func (r *ffReader) handleEscaped(c byte, j int, out DecodingBuffer) (int, error) { + if j >= r.l { + return 0, io.EOF + } + + c = r.s[j] + j++ + + if c == 'u' { + ru, err := r.readU4(j) + if err != nil { + return 0, err + } + + if utf16.IsSurrogate(ru) { + ru2, err := r.readU4(j + 6) + if err != nil { + return 0, err + } + out.Write(r.s[r.i : j-2]) + r.i = j + 10 + j = r.i + rval := utf16.DecodeRune(ru, ru2) + if rval != unicode.ReplacementChar { + out.WriteRune(rval) + } else { + return 0, fmt.Errorf("lex_string_invalid_unicode_surrogate: %v %v", ru, ru2) + } + } else { + out.Write(r.s[r.i : j-2]) + r.i = j + 4 + j = r.i + out.WriteRune(ru) + } + return j, nil + } else if byteLookupTable[c]&cVEC == 0 { + return 0, fmt.Errorf("lex_string_invalid_escaped_char: %v", c) + } else { + out.Write(r.s[r.i : j-2]) + r.i = j + j = r.i + + switch c { + case '"': + out.WriteByte('"') + case '\\': + out.WriteByte('\\') + case '/': + out.WriteByte('/') + case 'b': + out.WriteByte('\b') + case 'f': + out.WriteByte('\f') + case 'n': + out.WriteByte('\n') + case 'r': + out.WriteByte('\r') + case 't': + out.WriteByte('\t') + } + } + + return j, nil +} + +func (r *ffReader) SliceString(out DecodingBuffer) error { + var c byte + // TODO(pquerna): string_with_escapes? de-escape here? + j := r.i + + for { + if j >= r.l { + return io.EOF + } + + j, c = scanString(r.s, j) + + if c == '"' { + if j != r.i { + out.Write(r.s[r.i : j-1]) + r.i = j + } + return nil + } else if c == '\\' { + var err error + j, err = r.handleEscaped(c, j, out) + if err != nil { + return err + } + } else if byteLookupTable[c]&cIJC != 0 { + return fmt.Errorf("lex_string_invalid_json_char: %v", c) + } + continue + } +} + +// TODO(pquerna): consider combining wibth the normal byte mask. +var whitespaceLookupTable [256]bool = [256]bool{ + false, /* 0 */ + false, /* 1 */ + false, /* 2 */ + false, /* 3 */ + false, /* 4 */ + false, /* 5 */ + false, /* 6 */ + false, /* 7 */ + false, /* 8 */ + true, /* 9 */ + true, /* 10 */ + true, /* 11 */ + true, /* 12 */ + true, /* 13 */ + false, /* 14 */ + false, /* 15 */ + false, /* 16 */ + false, /* 17 */ + false, /* 18 */ + false, /* 19 */ + false, /* 20 */ + false, /* 21 */ + false, /* 22 */ + false, /* 23 */ + false, /* 24 */ + false, /* 25 */ + false, /* 26 */ + false, /* 27 */ + false, /* 28 */ + false, /* 29 */ + false, /* 30 */ + false, /* 31 */ + true, /* 32 */ + false, /* 33 */ + false, /* 34 */ + false, /* 35 */ + false, /* 36 */ + false, /* 37 */ + false, /* 38 */ + false, /* 39 */ + false, /* 40 */ + false, /* 41 */ + false, /* 42 */ + false, /* 43 */ + false, /* 44 */ + false, /* 45 */ + false, /* 46 */ + false, /* 47 */ + false, /* 48 */ + false, /* 49 */ + false, /* 50 */ + false, /* 51 */ + false, /* 52 */ + false, /* 53 */ + false, /* 54 */ + false, /* 55 */ + false, /* 56 */ + false, /* 57 */ + false, /* 58 */ + false, /* 59 */ + false, /* 60 */ + false, /* 61 */ + false, /* 62 */ + false, /* 63 */ + false, /* 64 */ + false, /* 65 */ + false, /* 66 */ + false, /* 67 */ + false, /* 68 */ + false, /* 69 */ + false, /* 70 */ + false, /* 71 */ + false, /* 72 */ + false, /* 73 */ + false, /* 74 */ + false, /* 75 */ + false, /* 76 */ + false, /* 77 */ + false, /* 78 */ + false, /* 79 */ + false, /* 80 */ + false, /* 81 */ + false, /* 82 */ + false, /* 83 */ + false, /* 84 */ + false, /* 85 */ + false, /* 86 */ + false, /* 87 */ + false, /* 88 */ + false, /* 89 */ + false, /* 90 */ + false, /* 91 */ + false, /* 92 */ + false, /* 93 */ + false, /* 94 */ + false, /* 95 */ + false, /* 96 */ + false, /* 97 */ + false, /* 98 */ + false, /* 99 */ + false, /* 100 */ + false, /* 101 */ + false, /* 102 */ + false, /* 103 */ + false, /* 104 */ + false, /* 105 */ + false, /* 106 */ + false, /* 107 */ + false, /* 108 */ + false, /* 109 */ + false, /* 110 */ + false, /* 111 */ + false, /* 112 */ + false, /* 113 */ + false, /* 114 */ + false, /* 115 */ + false, /* 116 */ + false, /* 117 */ + false, /* 118 */ + false, /* 119 */ + false, /* 120 */ + false, /* 121 */ + false, /* 122 */ + false, /* 123 */ + false, /* 124 */ + false, /* 125 */ + false, /* 126 */ + false, /* 127 */ + false, /* 128 */ + false, /* 129 */ + false, /* 130 */ + false, /* 131 */ + false, /* 132 */ + false, /* 133 */ + false, /* 134 */ + false, /* 135 */ + false, /* 136 */ + false, /* 137 */ + false, /* 138 */ + false, /* 139 */ + false, /* 140 */ + false, /* 141 */ + false, /* 142 */ + false, /* 143 */ + false, /* 144 */ + false, /* 145 */ + false, /* 146 */ + false, /* 147 */ + false, /* 148 */ + false, /* 149 */ + false, /* 150 */ + false, /* 151 */ + false, /* 152 */ + false, /* 153 */ + false, /* 154 */ + false, /* 155 */ + false, /* 156 */ + false, /* 157 */ + false, /* 158 */ + false, /* 159 */ + false, /* 160 */ + false, /* 161 */ + false, /* 162 */ + false, /* 163 */ + false, /* 164 */ + false, /* 165 */ + false, /* 166 */ + false, /* 167 */ + false, /* 168 */ + false, /* 169 */ + false, /* 170 */ + false, /* 171 */ + false, /* 172 */ + false, /* 173 */ + false, /* 174 */ + false, /* 175 */ + false, /* 176 */ + false, /* 177 */ + false, /* 178 */ + false, /* 179 */ + false, /* 180 */ + false, /* 181 */ + false, /* 182 */ + false, /* 183 */ + false, /* 184 */ + false, /* 185 */ + false, /* 186 */ + false, /* 187 */ + false, /* 188 */ + false, /* 189 */ + false, /* 190 */ + false, /* 191 */ + false, /* 192 */ + false, /* 193 */ + false, /* 194 */ + false, /* 195 */ + false, /* 196 */ + false, /* 197 */ + false, /* 198 */ + false, /* 199 */ + false, /* 200 */ + false, /* 201 */ + false, /* 202 */ + false, /* 203 */ + false, /* 204 */ + false, /* 205 */ + false, /* 206 */ + false, /* 207 */ + false, /* 208 */ + false, /* 209 */ + false, /* 210 */ + false, /* 211 */ + false, /* 212 */ + false, /* 213 */ + false, /* 214 */ + false, /* 215 */ + false, /* 216 */ + false, /* 217 */ + false, /* 218 */ + false, /* 219 */ + false, /* 220 */ + false, /* 221 */ + false, /* 222 */ + false, /* 223 */ + false, /* 224 */ + false, /* 225 */ + false, /* 226 */ + false, /* 227 */ + false, /* 228 */ + false, /* 229 */ + false, /* 230 */ + false, /* 231 */ + false, /* 232 */ + false, /* 233 */ + false, /* 234 */ + false, /* 235 */ + false, /* 236 */ + false, /* 237 */ + false, /* 238 */ + false, /* 239 */ + false, /* 240 */ + false, /* 241 */ + false, /* 242 */ + false, /* 243 */ + false, /* 244 */ + false, /* 245 */ + false, /* 246 */ + false, /* 247 */ + false, /* 248 */ + false, /* 249 */ + false, /* 250 */ + false, /* 251 */ + false, /* 252 */ + false, /* 253 */ + false, /* 254 */ + false, /* 255 */ +} diff --git a/vendor/github.com/pquerna/ffjson/fflib/v1/reader_scan_generic.go b/vendor/github.com/pquerna/ffjson/fflib/v1/reader_scan_generic.go new file mode 100644 index 000000000..47c260770 --- /dev/null +++ b/vendor/github.com/pquerna/ffjson/fflib/v1/reader_scan_generic.go @@ -0,0 +1,34 @@ +/** + * Copyright 2014 Paul Querna + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +package v1 + +func scanString(s []byte, j int) (int, byte) { + for { + if j >= len(s) { + return j, 0 + } + + c := s[j] + j++ + if byteLookupTable[c]&sliceStringMask == 0 { + continue + } + + return j, c + } +} |