mirror of
https://github.com/schollz/cowyo.git
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96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
package json
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import (
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"reflect"
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)
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// Extension holds a set of additional rules to be used when unmarshaling
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// strict JSON or JSON-like content.
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type Extension struct {
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funcs map[string]funcExt
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consts map[string]interface{}
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keyed map[string]func([]byte) (interface{}, error)
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encode map[reflect.Type]func(v interface{}) ([]byte, error)
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unquotedKeys bool
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trailingCommas bool
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}
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type funcExt struct {
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key string
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args []string
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}
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// Extend changes the decoder behavior to consider the provided extension.
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func (dec *Decoder) Extend(ext *Extension) { dec.d.ext = *ext }
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// Extend changes the encoder behavior to consider the provided extension.
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func (enc *Encoder) Extend(ext *Extension) { enc.ext = *ext }
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// Extend includes in e the extensions defined in ext.
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func (e *Extension) Extend(ext *Extension) {
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for name, fext := range ext.funcs {
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e.DecodeFunc(name, fext.key, fext.args...)
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}
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for name, value := range ext.consts {
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e.DecodeConst(name, value)
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}
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for key, decode := range ext.keyed {
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e.DecodeKeyed(key, decode)
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}
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for typ, encode := range ext.encode {
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if e.encode == nil {
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e.encode = make(map[reflect.Type]func(v interface{}) ([]byte, error))
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}
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e.encode[typ] = encode
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}
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}
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// DecodeFunc defines a function call that may be observed inside JSON content.
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// A function with the provided name will be unmarshaled as the document
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// {key: {args[0]: ..., args[N]: ...}}.
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func (e *Extension) DecodeFunc(name string, key string, args ...string) {
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if e.funcs == nil {
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e.funcs = make(map[string]funcExt)
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}
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e.funcs[name] = funcExt{key, args}
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}
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// DecodeConst defines a constant name that may be observed inside JSON content
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// and will be decoded with the provided value.
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func (e *Extension) DecodeConst(name string, value interface{}) {
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if e.consts == nil {
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e.consts = make(map[string]interface{})
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}
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e.consts[name] = value
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}
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// DecodeKeyed defines a key that when observed as the first element inside a
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// JSON document triggers the decoding of that document via the provided
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// decode function.
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func (e *Extension) DecodeKeyed(key string, decode func(data []byte) (interface{}, error)) {
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if e.keyed == nil {
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e.keyed = make(map[string]func([]byte) (interface{}, error))
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}
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e.keyed[key] = decode
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}
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// DecodeUnquotedKeys defines whether to accept map keys that are unquoted strings.
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func (e *Extension) DecodeUnquotedKeys(accept bool) {
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e.unquotedKeys = accept
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}
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// DecodeTrailingCommas defines whether to accept trailing commas in maps and arrays.
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func (e *Extension) DecodeTrailingCommas(accept bool) {
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e.trailingCommas = accept
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}
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// EncodeType registers a function to encode values with the same type of the
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// provided sample.
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func (e *Extension) EncodeType(sample interface{}, encode func(v interface{}) ([]byte, error)) {
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if e.encode == nil {
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e.encode = make(map[reflect.Type]func(v interface{}) ([]byte, error))
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}
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e.encode[reflect.TypeOf(sample)] = encode
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}
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