mirror of https://github.com/goccy/go-json.git
74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package json
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import (
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"unsafe"
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)
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type structFieldSet struct {
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dec decoder
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offset uintptr
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}
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type structDecoder struct {
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fieldMap map[string]*structFieldSet
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keyDecoder *stringDecoder
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}
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func newStructDecoder(fieldMap map[string]*structFieldSet) *structDecoder {
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return &structDecoder{
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fieldMap: fieldMap,
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keyDecoder: newStringDecoder(),
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}
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}
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func (d *structDecoder) decode(buf []byte, cursor int64, p uintptr) (int64, error) {
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buflen := int64(len(buf))
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] != '{' {
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return 0, errNotAtBeginningOfValue(cursor)
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}
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if buflen < 2 {
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return 0, errUnexpectedEndOfJSON("object", cursor)
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}
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cursor++
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for ; cursor < buflen; cursor++ {
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key, c, err := d.keyDecoder.decodeByte(buf, cursor)
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if err != nil {
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return 0, err
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}
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cursor = c
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] != ':' {
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return 0, errExpected("colon after object key", cursor)
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}
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cursor++
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if cursor >= buflen {
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return 0, errExpected("object value after colon", cursor)
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}
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k := *(*string)(unsafe.Pointer(&key))
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field, exists := d.fieldMap[k]
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if exists {
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c, err := field.dec.decode(buf, cursor, p+field.offset)
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if err != nil {
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return 0, err
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}
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cursor = c
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} else {
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c, err := skipValue(buf, cursor)
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if err != nil {
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return 0, err
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}
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cursor = c
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}
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] == '}' {
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cursor++
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return cursor, nil
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}
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if buf[cursor] != ',' {
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return 0, errExpected("comma after object element", cursor)
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}
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}
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return cursor, nil
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}
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