diff options
Diffstat (limited to 'vendor/gopkg.in/square/go-jose.v2/json/stream.go')
| -rw-r--r-- | vendor/gopkg.in/square/go-jose.v2/json/stream.go | 480 |
1 files changed, 0 insertions, 480 deletions
diff --git a/vendor/gopkg.in/square/go-jose.v2/json/stream.go b/vendor/gopkg.in/square/go-jose.v2/json/stream.go deleted file mode 100644 index 8ddcf4d27..000000000 --- a/vendor/gopkg.in/square/go-jose.v2/json/stream.go +++ /dev/null @@ -1,480 +0,0 @@ -// 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 json - -import ( - "bytes" - "errors" - "io" -) - -// A Decoder reads and decodes JSON objects from an input stream. -type Decoder struct { - r io.Reader - buf []byte - d decodeState - scanp int // start of unread data in buf - scan scanner - err error - - tokenState int - tokenStack []int -} - -// NewDecoder returns a new decoder that reads from r. -// -// The decoder introduces its own buffering and may -// read data from r beyond the JSON values requested. -func NewDecoder(r io.Reader) *Decoder { - return &Decoder{r: r} -} - -// UseNumber causes the Decoder to unmarshal a number into an interface{} as a -// Number instead of as a float64. -func (dec *Decoder) UseNumber() { dec.d.useNumber = true } - -// Decode reads the next JSON-encoded value from its -// input and stores it in the value pointed to by v. -// -// See the documentation for Unmarshal for details about -// the conversion of JSON into a Go value. -func (dec *Decoder) Decode(v interface{}) error { - if dec.err != nil { - return dec.err - } - - if err := dec.tokenPrepareForDecode(); err != nil { - return err - } - - if !dec.tokenValueAllowed() { - return &SyntaxError{msg: "not at beginning of value"} - } - - // Read whole value into buffer. - n, err := dec.readValue() - if err != nil { - return err - } - dec.d.init(dec.buf[dec.scanp : dec.scanp+n]) - dec.scanp += n - - // Don't save err from unmarshal into dec.err: - // the connection is still usable since we read a complete JSON - // object from it before the error happened. - err = dec.d.unmarshal(v) - - // fixup token streaming state - dec.tokenValueEnd() - - return err -} - -// Buffered returns a reader of the data remaining in the Decoder's -// buffer. The reader is valid until the next call to Decode. -func (dec *Decoder) Buffered() io.Reader { - return bytes.NewReader(dec.buf[dec.scanp:]) -} - -// readValue reads a JSON value into dec.buf. -// It returns the length of the encoding. -func (dec *Decoder) readValue() (int, error) { - dec.scan.reset() - - scanp := dec.scanp - var err error -Input: - for { - // Look in the buffer for a new value. - for i, c := range dec.buf[scanp:] { - dec.scan.bytes++ - v := dec.scan.step(&dec.scan, c) - if v == scanEnd { - scanp += i - break Input - } - // scanEnd is delayed one byte. - // We might block trying to get that byte from src, - // so instead invent a space byte. - if (v == scanEndObject || v == scanEndArray) && dec.scan.step(&dec.scan, ' ') == scanEnd { - scanp += i + 1 - break Input - } - if v == scanError { - dec.err = dec.scan.err - return 0, dec.scan.err - } - } - scanp = len(dec.buf) - - // Did the last read have an error? - // Delayed until now to allow buffer scan. - if err != nil { - if err == io.EOF { - if dec.scan.step(&dec.scan, ' ') == scanEnd { - break Input - } - if nonSpace(dec.buf) { - err = io.ErrUnexpectedEOF - } - } - dec.err = err - return 0, err - } - - n := scanp - dec.scanp - err = dec.refill() - scanp = dec.scanp + n - } - return scanp - dec.scanp, nil -} - -func (dec *Decoder) refill() error { - // Make room to read more into the buffer. - // First slide down data already consumed. - if dec.scanp > 0 { - n := copy(dec.buf, dec.buf[dec.scanp:]) - dec.buf = dec.buf[:n] - dec.scanp = 0 - } - - // Grow buffer if not large enough. - const minRead = 512 - if cap(dec.buf)-len(dec.buf) < minRead { - newBuf := make([]byte, len(dec.buf), 2*cap(dec.buf)+minRead) - copy(newBuf, dec.buf) - dec.buf = newBuf - } - - // Read. Delay error for next iteration (after scan). - n, err := dec.r.Read(dec.buf[len(dec.buf):cap(dec.buf)]) - dec.buf = dec.buf[0 : len(dec.buf)+n] - - return err -} - -func nonSpace(b []byte) bool { - for _, c := range b { - if !isSpace(c) { - return true - } - } - return false -} - -// An Encoder writes JSON objects to an output stream. -type Encoder struct { - w io.Writer - err error -} - -// NewEncoder returns a new encoder that writes to w. -func NewEncoder(w io.Writer) *Encoder { - return &Encoder{w: w} -} - -// Encode writes the JSON encoding of v to the stream, -// followed by a newline character. -// -// See the documentation for Marshal for details about the -// conversion of Go values to JSON. -func (enc *Encoder) Encode(v interface{}) error { - if enc.err != nil { - return enc.err - } - e := newEncodeState() - err := e.marshal(v) - if err != nil { - return err - } - - // Terminate each value with a newline. - // This makes the output look a little nicer - // when debugging, and some kind of space - // is required if the encoded value was a number, - // so that the reader knows there aren't more - // digits coming. - e.WriteByte('\n') - - if _, err = enc.w.Write(e.Bytes()); err != nil { - enc.err = err - } - encodeStatePool.Put(e) - return err -} - -// RawMessage is a raw encoded JSON object. -// It implements Marshaler and Unmarshaler and can -// be used to delay JSON decoding or precompute a JSON encoding. -type RawMessage []byte - -// MarshalJSON returns *m as the JSON encoding of m. -func (m *RawMessage) MarshalJSON() ([]byte, error) { - return *m, nil -} - -// UnmarshalJSON sets *m to a copy of data. -func (m *RawMessage) UnmarshalJSON(data []byte) error { - if m == nil { - return errors.New("json.RawMessage: UnmarshalJSON on nil pointer") - } - *m = append((*m)[0:0], data...) - return nil -} - -var _ Marshaler = (*RawMessage)(nil) -var _ Unmarshaler = (*RawMessage)(nil) - -// A Token holds a value of one of these types: -// -// Delim, for the four JSON delimiters [ ] { } -// bool, for JSON booleans -// float64, for JSON numbers -// Number, for JSON numbers -// string, for JSON string literals -// nil, for JSON null -// -type Token interface{} - -const ( - tokenTopValue = iota - tokenArrayStart - tokenArrayValue - tokenArrayComma - tokenObjectStart - tokenObjectKey - tokenObjectColon - tokenObjectValue - tokenObjectComma -) - -// advance tokenstate from a separator state to a value state -func (dec *Decoder) tokenPrepareForDecode() error { - // Note: Not calling peek before switch, to avoid - // putting peek into the standard Decode path. - // peek is only called when using the Token API. - switch dec.tokenState { - case tokenArrayComma: - c, err := dec.peek() - if err != nil { - return err - } - if c != ',' { - return &SyntaxError{"expected comma after array element", 0} - } - dec.scanp++ - dec.tokenState = tokenArrayValue - case tokenObjectColon: - c, err := dec.peek() - if err != nil { - return err - } - if c != ':' { - return &SyntaxError{"expected colon after object key", 0} - } - dec.scanp++ - dec.tokenState = tokenObjectValue - } - return nil -} - -func (dec *Decoder) tokenValueAllowed() bool { - switch dec.tokenState { - case tokenTopValue, tokenArrayStart, tokenArrayValue, tokenObjectValue: - return true - } - return false -} - -func (dec *Decoder) tokenValueEnd() { - switch dec.tokenState { - case tokenArrayStart, tokenArrayValue: - dec.tokenState = tokenArrayComma - case tokenObjectValue: - dec.tokenState = tokenObjectComma - } -} - -// A Delim is a JSON array or object delimiter, one of [ ] { or }. -type Delim rune - -func (d Delim) String() string { - return string(d) -} - -// Token returns the next JSON token in the input stream. -// At the end of the input stream, Token returns nil, io.EOF. -// -// Token guarantees that the delimiters [ ] { } it returns are -// properly nested and matched: if Token encounters an unexpected -// delimiter in the input, it will return an error. -// -// The input stream consists of basic JSON values—bool, string, -// number, and null—along with delimiters [ ] { } of type Delim -// to mark the start and end of arrays and objects. -// Commas and colons are elided. -func (dec *Decoder) Token() (Token, error) { - for { - c, err := dec.peek() - if err != nil { - return nil, err - } - switch c { - case '[': - if !dec.tokenValueAllowed() { - return dec.tokenError(c) - } - dec.scanp++ - dec.tokenStack = append(dec.tokenStack, dec.tokenState) - dec.tokenState = tokenArrayStart - return Delim('['), nil - - case ']': - if dec.tokenState != tokenArrayStart && dec.tokenState != tokenArrayComma { - return dec.tokenError(c) - } - dec.scanp++ - dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1] - dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1] - dec.tokenValueEnd() - return Delim(']'), nil - - case '{': - if !dec.tokenValueAllowed() { - return dec.tokenError(c) - } - dec.scanp++ - dec.tokenStack = append(dec.tokenStack, dec.tokenState) - dec.tokenState = tokenObjectStart - return Delim('{'), nil - - case '}': - if dec.tokenState != tokenObjectStart && dec.tokenState != tokenObjectComma { - return dec.tokenError(c) - } - dec.scanp++ - dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1] - dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1] - dec.tokenValueEnd() - return Delim('}'), nil - - case ':': - if dec.tokenState != tokenObjectColon { - return dec.tokenError(c) - } - dec.scanp++ - dec.tokenState = tokenObjectValue - continue - - case ',': - if dec.tokenState == tokenArrayComma { - dec.scanp++ - dec.tokenState = tokenArrayValue - continue - } - if dec.tokenState == tokenObjectComma { - dec.scanp++ - dec.tokenState = tokenObjectKey - continue - } - return dec.tokenError(c) - - case '"': - if dec.tokenState == tokenObjectStart || dec.tokenState == tokenObjectKey { - var x string - old := dec.tokenState - dec.tokenState = tokenTopValue - err := dec.Decode(&x) - dec.tokenState = old - if err != nil { - clearOffset(err) - return nil, err - } - dec.tokenState = tokenObjectColon - return x, nil - } - fallthrough - - default: - if !dec.tokenValueAllowed() { - return dec.tokenError(c) - } - var x interface{} - if err := dec.Decode(&x); err != nil { - clearOffset(err) - return nil, err - } - return x, nil - } - } -} - -func clearOffset(err error) { - if s, ok := err.(*SyntaxError); ok { - s.Offset = 0 - } -} - -func (dec *Decoder) tokenError(c byte) (Token, error) { - var context string - switch dec.tokenState { - case tokenTopValue: - context = " looking for beginning of value" - case tokenArrayStart, tokenArrayValue, tokenObjectValue: - context = " looking for beginning of value" - case tokenArrayComma: - context = " after array element" - case tokenObjectKey: - context = " looking for beginning of object key string" - case tokenObjectColon: - context = " after object key" - case tokenObjectComma: - context = " after object key:value pair" - } - return nil, &SyntaxError{"invalid character " + quoteChar(c) + " " + context, 0} -} - -// More reports whether there is another element in the -// current array or object being parsed. -func (dec *Decoder) More() bool { - c, err := dec.peek() - return err == nil && c != ']' && c != '}' -} - -func (dec *Decoder) peek() (byte, error) { - var err error - for { - for i := dec.scanp; i < len(dec.buf); i++ { - c := dec.buf[i] - if isSpace(c) { - continue - } - dec.scanp = i - return c, nil - } - // buffer has been scanned, now report any error - if err != nil { - return 0, err - } - err = dec.refill() - } -} - -/* -TODO - -// EncodeToken writes the given JSON token to the stream. -// It returns an error if the delimiters [ ] { } are not properly used. -// -// EncodeToken does not call Flush, because usually it is part of -// a larger operation such as Encode, and those will call Flush when finished. -// Callers that create an Encoder and then invoke EncodeToken directly, -// without using Encode, need to call Flush when finished to ensure that -// the JSON is written to the underlying writer. -func (e *Encoder) EncodeToken(t Token) error { - ... -} - -*/ |