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|
package gojay
import (
"unsafe"
)
// DecodeString reads the next JSON-encoded value from the decoder's input (io.Reader) and stores it in the string pointed to by v.
//
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
func (dec *Decoder) DecodeString(v *string) error {
if dec.isPooled == 1 {
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
}
return dec.decodeString(v)
}
func (dec *Decoder) decodeString(v *string) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch dec.data[dec.cursor] {
case ' ', '\n', '\t', '\r', ',':
// is string
continue
case '"':
dec.cursor++
start, end, err := dec.getString()
if err != nil {
return err
}
// we do minus one to remove the last quote
d := dec.data[start : end-1]
*v = *(*string)(unsafe.Pointer(&d))
dec.cursor = end
return nil
// is nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return nil
}
func (dec *Decoder) decodeStringNull(v **string) error {
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
switch dec.data[dec.cursor] {
case ' ', '\n', '\t', '\r', ',':
// is string
continue
case '"':
dec.cursor++
start, end, err := dec.getString()
if err != nil {
return err
}
if *v == nil {
*v = new(string)
}
// we do minus one to remove the last quote
d := dec.data[start : end-1]
**v = *(*string)(unsafe.Pointer(&d))
dec.cursor = end
return nil
// is nil
case 'n':
dec.cursor++
err := dec.assertNull()
if err != nil {
return err
}
return nil
default:
dec.err = dec.makeInvalidUnmarshalErr(v)
err := dec.skipData()
if err != nil {
return err
}
return nil
}
}
return nil
}
func (dec *Decoder) parseEscapedString() error {
if dec.cursor >= dec.length && !dec.read() {
return dec.raiseInvalidJSONErr(dec.cursor)
}
switch dec.data[dec.cursor] {
case '"':
dec.data[dec.cursor] = '"'
case '\\':
dec.data[dec.cursor] = '\\'
case '/':
dec.data[dec.cursor] = '/'
case 'b':
dec.data[dec.cursor] = '\b'
case 'f':
dec.data[dec.cursor] = '\f'
case 'n':
dec.data[dec.cursor] = '\n'
case 'r':
dec.data[dec.cursor] = '\r'
case 't':
dec.data[dec.cursor] = '\t'
case 'u':
start := dec.cursor
dec.cursor++
str, err := dec.parseUnicode()
if err != nil {
return err
}
diff := dec.cursor - start
dec.data = append(append(dec.data[:start-1], str...), dec.data[dec.cursor:]...)
dec.length = len(dec.data)
dec.cursor += len(str) - diff - 1
return nil
default:
return dec.raiseInvalidJSONErr(dec.cursor)
}
dec.data = append(dec.data[:dec.cursor-1], dec.data[dec.cursor:]...)
dec.length--
// Since we've lost a character, our dec.cursor offset is now
// 1 past the escaped character which is precisely where we
// want it.
return nil
}
func (dec *Decoder) getString() (int, int, error) {
// extract key
var keyStart = dec.cursor
// var str *Builder
for dec.cursor < dec.length || dec.read() {
switch dec.data[dec.cursor] {
// string found
case '"':
dec.cursor = dec.cursor + 1
return keyStart, dec.cursor, nil
// slash found
case '\\':
dec.cursor = dec.cursor + 1
err := dec.parseEscapedString()
if err != nil {
return 0, 0, err
}
default:
dec.cursor = dec.cursor + 1
continue
}
}
return 0, 0, dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) skipEscapedString() error {
start := dec.cursor
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
if dec.data[dec.cursor] != '\\' {
d := dec.data[dec.cursor]
dec.cursor = dec.cursor + 1
nSlash := dec.cursor - start
switch d {
case '"':
// nSlash must be odd
if nSlash&1 != 1 {
return dec.raiseInvalidJSONErr(dec.cursor)
}
return nil
case 'u': // is unicode, we skip the following characters and place the cursor one one byte backward to avoid it breaking when returning to skipString
if err := dec.skipString(); err != nil {
return err
}
dec.cursor--
return nil
case 'n', 'r', 't', '/', 'f', 'b':
return nil
default:
// nSlash must be even
if nSlash&1 == 1 {
return dec.raiseInvalidJSONErr(dec.cursor)
}
return nil
}
}
}
return dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) skipString() error {
for dec.cursor < dec.length || dec.read() {
switch dec.data[dec.cursor] {
// found the closing quote
// let's return
case '"':
dec.cursor = dec.cursor + 1
return nil
// solidus found start parsing an escaped string
case '\\':
dec.cursor = dec.cursor + 1
err := dec.skipEscapedString()
if err != nil {
return err
}
default:
dec.cursor = dec.cursor + 1
continue
}
}
return dec.raiseInvalidJSONErr(len(dec.data) - 1)
}
// Add Values functions
// AddString decodes the JSON value within an object or an array to a *string.
// If next key is not a JSON string nor null, InvalidUnmarshalError will be returned.
func (dec *Decoder) AddString(v *string) error {
return dec.String(v)
}
// AddStringNull decodes the JSON value within an object or an array to a *string.
// If next key is not a JSON string nor null, InvalidUnmarshalError will be returned.
// If a `null` is encountered, gojay does not change the value of the pointer.
func (dec *Decoder) AddStringNull(v **string) error {
return dec.StringNull(v)
}
// String decodes the JSON value within an object or an array to a *string.
// If next key is not a JSON string nor null, InvalidUnmarshalError will be returned.
func (dec *Decoder) String(v *string) error {
err := dec.decodeString(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}
// StringNull decodes the JSON value within an object or an array to a **string.
// If next key is not a JSON string nor null, InvalidUnmarshalError will be returned.
// If a `null` is encountered, gojay does not change the value of the pointer.
func (dec *Decoder) StringNull(v **string) error {
err := dec.decodeStringNull(v)
if err != nil {
return err
}
dec.called |= 1
return nil
}
|
