mirror of
https://github.com/rocky-linux/peridot.git
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214 lines
6.5 KiB
Go
214 lines
6.5 KiB
Go
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package json
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import (
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"bytes"
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"errors"
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"reflect"
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)
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// This package supports "inlining" a Go struct field, where the contents
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// of the serialized field (which must be a JSON object) are treated as if
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// they are part of the parent Go struct (which represents a JSON object).
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//
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// Generally, inlined fields are of a Go struct type, where the fields of the
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// nested struct are virtually hoisted up to the parent struct using rules
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// similar to how Go embedding works (but operating within the JSON namespace).
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//
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// However, inlined fields may also be of a Go map type with a string key
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// or a RawValue. Such inlined fields are called "fallback" fields since they
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// represent any arbitrary JSON object member. Explicitly named fields take
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// precedence over the inlined fallback. Only one inlined fallback is allowed.
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var rawValueType = reflect.TypeOf((*RawValue)(nil)).Elem()
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// marshalInlinedFallbackAll marshals all the members in an inlined fallback.
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func marshalInlinedFallbackAll(mo MarshalOptions, enc *Encoder, va addressableValue, f *structField, insertUnquotedName func([]byte) bool) error {
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v := addressableValue{va.Field(f.index[0])} // addressable if struct value is addressable
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if len(f.index) > 1 {
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v = v.fieldByIndex(f.index[1:], false)
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if !v.IsValid() {
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return nil // implies a nil inlined field
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}
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}
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v = v.indirect(false)
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if !v.IsValid() {
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return nil
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}
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if v.Type() == rawValueType {
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b := v.Interface().(RawValue)
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if len(b) == 0 { // TODO: Should this be nil? What if it were all whitespace?
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return nil
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}
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dec := getBufferedDecoder(b, DecodeOptions{AllowDuplicateNames: true, AllowInvalidUTF8: true})
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defer putBufferedDecoder(dec)
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tok, err := dec.ReadToken()
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if err != nil {
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return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
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}
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if tok.Kind() != '{' {
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err := errors.New("inlined raw value must be a JSON object")
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return &SemanticError{action: "marshal", JSONKind: tok.Kind(), GoType: rawValueType, Err: err}
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}
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for dec.PeekKind() != '}' {
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// Parse the JSON object name.
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var flags valueFlags
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val, err := dec.readValue(&flags)
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if err != nil {
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return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
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}
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if insertUnquotedName != nil {
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name := unescapeStringMayCopy(val, flags.isVerbatim())
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if !insertUnquotedName(name) {
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return &SyntacticError{str: "duplicate name " + string(val) + " in object"}
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}
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}
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if err := enc.WriteValue(val); err != nil {
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return err
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}
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// Parse the JSON object value.
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val, err = dec.readValue(&flags)
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if err != nil {
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return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
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}
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if err := enc.WriteValue(val); err != nil {
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return err
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}
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}
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if _, err := dec.ReadToken(); err != nil {
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return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
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}
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if err := dec.checkEOF(); err != nil {
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return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
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}
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return nil
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} else {
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m := v // must be a map[string]V
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n := m.Len()
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if n == 0 {
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return nil
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}
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mk := newAddressableValue(stringType)
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mv := newAddressableValue(m.Type().Elem())
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marshalKey := func(mk addressableValue) error {
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b, err := appendString(enc.UnusedBuffer(), mk.String(), !enc.options.AllowInvalidUTF8, nil)
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if err != nil {
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return err
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}
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if insertUnquotedName != nil {
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isVerbatim := bytes.IndexByte(b, '\\') < 0
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name := unescapeStringMayCopy(b, isVerbatim)
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if !insertUnquotedName(name) {
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return &SyntacticError{str: "duplicate name " + string(b) + " in object"}
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}
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}
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return enc.WriteValue(b)
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}
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marshalVal := f.fncs.marshal
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if mo.Marshalers != nil {
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marshalVal, _ = mo.Marshalers.lookup(marshalVal, mv.Type())
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}
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if !mo.Deterministic || n <= 1 {
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for iter := m.MapRange(); iter.Next(); {
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mk.SetIterKey(iter)
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if err := marshalKey(mk); err != nil {
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return err
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}
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mv.Set(iter.Value())
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if err := marshalVal(mo, enc, mv); err != nil {
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return err
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}
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}
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} else {
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names := getStrings(n)
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for i, iter := 0, m.Value.MapRange(); i < n && iter.Next(); i++ {
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mk.SetIterKey(iter)
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(*names)[i] = mk.String()
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}
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names.Sort()
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for _, name := range *names {
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mk.SetString(name)
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if err := marshalKey(mk); err != nil {
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return err
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}
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// TODO(https://go.dev/issue/57061): Use mv.SetMapIndexOf.
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mv.Set(m.MapIndex(mk.Value))
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if err := marshalVal(mo, enc, mv); err != nil {
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return err
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}
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}
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putStrings(names)
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}
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return nil
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}
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}
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// unmarshalInlinedFallbackNext unmarshals only the next member in an inlined fallback.
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func unmarshalInlinedFallbackNext(uo UnmarshalOptions, dec *Decoder, va addressableValue, f *structField, quotedName, unquotedName []byte) error {
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v := addressableValue{va.Field(f.index[0])} // addressable if struct value is addressable
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if len(f.index) > 1 {
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v = v.fieldByIndex(f.index[1:], true)
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}
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v = v.indirect(true)
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if v.Type() == rawValueType {
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b := v.Addr().Interface().(*RawValue)
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if len(*b) == 0 { // TODO: Should this be nil? What if it were all whitespace?
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*b = append(*b, '{')
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} else {
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*b = trimSuffixWhitespace(*b)
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if hasSuffixByte(*b, '}') {
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// TODO: When merging into an object for the first time,
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// should we verify that it is valid?
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*b = trimSuffixByte(*b, '}')
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*b = trimSuffixWhitespace(*b)
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if !hasSuffixByte(*b, ',') && !hasSuffixByte(*b, '{') {
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*b = append(*b, ',')
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}
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} else {
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err := errors.New("inlined raw value must be a JSON object")
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return &SemanticError{action: "unmarshal", GoType: rawValueType, Err: err}
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}
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}
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*b = append(*b, quotedName...)
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*b = append(*b, ':')
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rawValue, err := dec.ReadValue()
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if err != nil {
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return err
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}
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*b = append(*b, rawValue...)
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*b = append(*b, '}')
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return nil
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} else {
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name := string(unquotedName) // TODO: Intern this?
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m := v // must be a map[string]V
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if m.IsNil() {
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m.Set(reflect.MakeMap(m.Type()))
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}
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mk := reflect.ValueOf(name)
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mv := newAddressableValue(v.Type().Elem()) // TODO: Cache across calls?
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if v2 := m.MapIndex(mk); v2.IsValid() {
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mv.Set(v2)
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}
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unmarshal := f.fncs.unmarshal
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if uo.Unmarshalers != nil {
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unmarshal, _ = uo.Unmarshalers.lookup(unmarshal, mv.Type())
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}
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err := unmarshal(uo, dec, mv)
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m.SetMapIndex(mk, mv.Value)
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if err != nil {
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return err
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}
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return nil
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}
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}
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