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package jsoniter
import (
"fmt"
"unicode"
"unsafe"
)
// ReadObject read one field from object.
// If object ended, returns empty string.
// Otherwise, returns the field name.
func (iter *Iterator) ReadObject() (ret string) {
c := iter.nextToken()
switch c {
case 'n':
iter.skipThreeBytes('u', 'l', 'l')
return "" // null
case '{':
c = iter.nextToken()
if c == '"' {
iter.unreadByte()
return string(iter.readObjectFieldAsBytes())
}
if c == '}' {
return "" // end of object
}
iter.ReportError("ReadObject", `expect " after {`)
return
case ',':
return string(iter.readObjectFieldAsBytes())
case '}':
return "" // end of object
default:
iter.ReportError("ReadObject", fmt.Sprintf(`expect { or , or } or n, but found %s`, string([]byte{c})))
return
}
}
func (iter *Iterator) readFieldHash() int32 {
hash := int64(0x811c9dc5)
c := iter.nextToken()
if c == '"' {
for {
for i := iter.head; i < iter.tail; i++ {
// require ascii string and no escape
b := iter.buf[i]
if 'A' <= b && b <= 'Z' {
b += 'a' - 'A'
}
if b == '"' {
iter.head = i + 1
c = iter.nextToken()
if c != ':' {
iter.ReportError("readFieldHash", `expect :, but found `+string([]byte{c}))
}
return int32(hash)
}
hash ^= int64(b)
hash *= 0x1000193
}
if !iter.loadMore() {
iter.ReportError("readFieldHash", `incomplete field name`)
return 0
}
}
}
iter.ReportError("readFieldHash", `expect ", but found `+string([]byte{c}))
return 0
}
func calcHash(str string) int32 {
hash := int64(0x811c9dc5)
for _, b := range str {
hash ^= int64(unicode.ToLower(b))
hash *= 0x1000193
}
return int32(hash)
}
// ReadObjectCB read object with callback, the key is ascii only and field name not copied
func (iter *Iterator) ReadObjectCB(callback func(*Iterator, string) bool) bool {
c := iter.nextToken()
if c == '{' {
c = iter.nextToken()
if c == '"' {
iter.unreadByte()
field := iter.readObjectFieldAsBytes()
if !callback(iter, *(*string)(unsafe.Pointer(&field))) {
return false
}
c = iter.nextToken()
for c == ',' {
field = iter.readObjectFieldAsBytes()
if !callback(iter, *(*string)(unsafe.Pointer(&field))) {
return false
}
c = iter.nextToken()
}
if c != '}' {
iter.ReportError("ReadObjectCB", `object not ended with }`)
return false
}
return true
}
if c == '}' {
return true
}
iter.ReportError("ReadObjectCB", `expect " after }`)
return false
}
if c == 'n' {
iter.skipThreeBytes('u', 'l', 'l')
return true // null
}
iter.ReportError("ReadObjectCB", `expect { or n`)
return false
}
// ReadMapCB read map with callback, the key can be any string
func (iter *Iterator) ReadMapCB(callback func(*Iterator, string) bool) bool {
c := iter.nextToken()
if c == '{' {
c = iter.nextToken()
if c == '"' {
iter.unreadByte()
field := iter.ReadString()
if iter.nextToken() != ':' {
iter.ReportError("ReadMapCB", "expect : after object field")
return false
}
if !callback(iter, field) {
return false
}
c = iter.nextToken()
for c == ',' {
field = iter.ReadString()
if iter.nextToken() != ':' {
iter.ReportError("ReadMapCB", "expect : after object field")
return false
}
if !callback(iter, field) {
return false
}
c = iter.nextToken()
}
if c != '}' {
iter.ReportError("ReadMapCB", `object not ended with }`)
return false
}
return true
}
if c == '}' {
return true
}
iter.ReportError("ReadMapCB", `expect " after }`)
return false
}
if c == 'n' {
iter.skipThreeBytes('u', 'l', 'l')
return true // null
}
iter.ReportError("ReadMapCB", `expect { or n`)
return false
}
func (iter *Iterator) readObjectStart() bool {
c := iter.nextToken()
if c == '{' {
c = iter.nextToken()
if c == '}' {
return false
}
iter.unreadByte()
return true
} else if c == 'n' {
iter.skipThreeBytes('u', 'l', 'l')
return false
}
iter.ReportError("readObjectStart", "expect { or n")
return false
}
func (iter *Iterator) readObjectFieldAsBytes() (ret []byte) {
str := iter.ReadStringAsSlice()
if iter.skipWhitespacesWithoutLoadMore() {
if ret == nil {
ret = make([]byte, len(str))
copy(ret, str)
}
if !iter.loadMore() {
return
}
}
if iter.buf[iter.head] != ':' {
iter.ReportError("readObjectFieldAsBytes", "expect : after object field")
return
}
iter.head++
if iter.skipWhitespacesWithoutLoadMore() {
if ret == nil {
ret = make([]byte, len(str))
copy(ret, str)
}
if !iter.loadMore() {
return
}
}
if ret == nil {
return str
}
return ret
}
|
