1685 lines
40 KiB
Go
1685 lines
40 KiB
Go
// Copyright 2010 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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// Represents JSON data structure using native Go types: booleans, floats,
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// strings, arrays, and maps.
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package json
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import (
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"bytes"
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"encoding"
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"encoding/base64"
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"errors"
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"fmt"
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"reflect"
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"runtime"
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"strconv"
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"unicode"
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"unicode/utf16"
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"unicode/utf8"
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)
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// Unmarshal parses the JSON-encoded data and stores the result
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// in the value pointed to by v.
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//
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// Unmarshal uses the inverse of the encodings that
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// Marshal uses, allocating maps, slices, and pointers as necessary,
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// with the following additional rules:
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//
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// To unmarshal JSON into a pointer, Unmarshal first handles the case of
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// the JSON being the JSON literal null. In that case, Unmarshal sets
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// the pointer to nil. Otherwise, Unmarshal unmarshals the JSON into
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// the value pointed at by the pointer. If the pointer is nil, Unmarshal
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// allocates a new value for it to point to.
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//
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// To unmarshal JSON into a struct, Unmarshal matches incoming object
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// keys to the keys used by Marshal (either the struct field name or its tag),
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// preferring an exact match but also accepting a case-insensitive match.
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// Unmarshal will only set exported fields of the struct.
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//
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// To unmarshal JSON into an interface value,
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// Unmarshal stores one of these in the interface value:
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//
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// bool, for JSON booleans
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// float64, for JSON numbers
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// string, for JSON strings
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// []interface{}, for JSON arrays
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// map[string]interface{}, for JSON objects
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// nil for JSON null
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//
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// To unmarshal a JSON array into a slice, Unmarshal resets the slice length
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// to zero and then appends each element to the slice.
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// As a special case, to unmarshal an empty JSON array into a slice,
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// Unmarshal replaces the slice with a new empty slice.
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//
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// To unmarshal a JSON array into a Go array, Unmarshal decodes
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// JSON array elements into corresponding Go array elements.
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// If the Go array is smaller than the JSON array,
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// the additional JSON array elements are discarded.
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// If the JSON array is smaller than the Go array,
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// the additional Go array elements are set to zero values.
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//
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// To unmarshal a JSON object into a map, Unmarshal first establishes a map to
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// use, If the map is nil, Unmarshal allocates a new map. Otherwise Unmarshal
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// reuses the existing map, keeping existing entries. Unmarshal then stores key-
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// value pairs from the JSON object into the map. The map's key type must
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// either be a string or implement encoding.TextUnmarshaler.
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//
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// If a JSON value is not appropriate for a given target type,
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// or if a JSON number overflows the target type, Unmarshal
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// skips that field and completes the unmarshaling as best it can.
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// If no more serious errors are encountered, Unmarshal returns
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// an UnmarshalTypeError describing the earliest such error.
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//
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// The JSON null value unmarshals into an interface, map, pointer, or slice
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// by setting that Go value to nil. Because null is often used in JSON to mean
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// ``not present,'' unmarshaling a JSON null into any other Go type has no effect
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// on the value and produces no error.
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//
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// When unmarshaling quoted strings, invalid UTF-8 or
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// invalid UTF-16 surrogate pairs are not treated as an error.
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// Instead, they are replaced by the Unicode replacement
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// character U+FFFD.
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//
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func Unmarshal(data []byte, v interface{}) error {
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// Check for well-formedness.
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// Avoids filling out half a data structure
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// before discovering a JSON syntax error.
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var d decodeState
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err := checkValid(data, &d.scan)
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if err != nil {
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return err
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}
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d.init(data)
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return d.unmarshal(v)
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}
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// Unmarshaler is the interface implemented by types
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// that can unmarshal a JSON description of themselves.
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// The input can be assumed to be a valid encoding of
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// a JSON value. UnmarshalJSON must copy the JSON data
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// if it wishes to retain the data after returning.
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type Unmarshaler interface {
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UnmarshalJSON([]byte) error
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}
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// An UnmarshalTypeError describes a JSON value that was
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// not appropriate for a value of a specific Go type.
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type UnmarshalTypeError struct {
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Value string // description of JSON value - "bool", "array", "number -5"
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Type reflect.Type // type of Go value it could not be assigned to
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Offset int64 // error occurred after reading Offset bytes
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}
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func (e *UnmarshalTypeError) Error() string {
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return "json: cannot unmarshal " + e.Value + " into Go value of type " + e.Type.String()
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}
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// An UnmarshalFieldError describes a JSON object key that
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// led to an unexported (and therefore unwritable) struct field.
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// (No longer used; kept for compatibility.)
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type UnmarshalFieldError struct {
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Key string
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Type reflect.Type
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Field reflect.StructField
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}
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func (e *UnmarshalFieldError) Error() string {
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return "json: cannot unmarshal object key " + strconv.Quote(e.Key) + " into unexported field " + e.Field.Name + " of type " + e.Type.String()
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}
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// An InvalidUnmarshalError describes an invalid argument passed to Unmarshal.
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// (The argument to Unmarshal must be a non-nil pointer.)
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type InvalidUnmarshalError struct {
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Type reflect.Type
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}
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func (e *InvalidUnmarshalError) Error() string {
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if e.Type == nil {
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return "json: Unmarshal(nil)"
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}
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if e.Type.Kind() != reflect.Ptr {
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return "json: Unmarshal(non-pointer " + e.Type.String() + ")"
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}
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return "json: Unmarshal(nil " + e.Type.String() + ")"
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}
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func (d *decodeState) unmarshal(v interface{}) (err error) {
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defer func() {
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if r := recover(); r != nil {
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if _, ok := r.(runtime.Error); ok {
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panic(r)
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}
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err = r.(error)
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}
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}()
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rv := reflect.ValueOf(v)
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if rv.Kind() != reflect.Ptr || rv.IsNil() {
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return &InvalidUnmarshalError{reflect.TypeOf(v)}
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}
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d.scan.reset()
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// We decode rv not rv.Elem because the Unmarshaler interface
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// test must be applied at the top level of the value.
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d.value(rv)
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return d.savedError
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}
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// A Number represents a JSON number literal.
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type Number string
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// String returns the literal text of the number.
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func (n Number) String() string { return string(n) }
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// Float64 returns the number as a float64.
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func (n Number) Float64() (float64, error) {
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return strconv.ParseFloat(string(n), 64)
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}
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// Int64 returns the number as an int64.
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func (n Number) Int64() (int64, error) {
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return strconv.ParseInt(string(n), 10, 64)
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}
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// isValidNumber reports whether s is a valid JSON number literal.
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func isValidNumber(s string) bool {
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// This function implements the JSON numbers grammar.
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// See https://tools.ietf.org/html/rfc7159#section-6
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// and http://json.org/number.gif
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if s == "" {
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return false
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}
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// Optional -
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if s[0] == '-' {
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s = s[1:]
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if s == "" {
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return false
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}
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}
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// Digits
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switch {
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default:
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return false
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case s[0] == '0':
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s = s[1:]
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case '1' <= s[0] && s[0] <= '9':
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s = s[1:]
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// . followed by 1 or more digits.
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if len(s) >= 2 && s[0] == '.' && '0' <= s[1] && s[1] <= '9' {
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s = s[2:]
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// e or E followed by an optional - or + and
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// 1 or more digits.
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if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') {
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s = s[1:]
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if s[0] == '+' || s[0] == '-' {
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s = s[1:]
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if s == "" {
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return false
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}
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}
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for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
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s = s[1:]
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}
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}
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// Make sure we are at the end.
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return s == ""
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}
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// decodeState represents the state while decoding a JSON value.
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type decodeState struct {
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data []byte
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off int // read offset in data
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scan scanner
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nextscan scanner // for calls to nextValue
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savedError error
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useNumber bool
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ext Extension
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}
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// errPhase is used for errors that should not happen unless
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// there is a bug in the JSON decoder or something is editing
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// the data slice while the decoder executes.
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var errPhase = errors.New("JSON decoder out of sync - data changing underfoot?")
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func (d *decodeState) init(data []byte) *decodeState {
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d.data = data
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d.off = 0
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d.savedError = nil
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return d
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}
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// error aborts the decoding by panicking with err.
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func (d *decodeState) error(err error) {
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panic(err)
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}
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// saveError saves the first err it is called with,
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// for reporting at the end of the unmarshal.
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func (d *decodeState) saveError(err error) {
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if d.savedError == nil {
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d.savedError = err
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}
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}
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// next cuts off and returns the next full JSON value in d.data[d.off:].
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// The next value is known to be an object or array, not a literal.
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func (d *decodeState) next() []byte {
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c := d.data[d.off]
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item, rest, err := nextValue(d.data[d.off:], &d.nextscan)
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if err != nil {
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d.error(err)
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}
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d.off = len(d.data) - len(rest)
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// Our scanner has seen the opening brace/bracket
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// and thinks we're still in the middle of the object.
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// invent a closing brace/bracket to get it out.
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if c == '{' {
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d.scan.step(&d.scan, '}')
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} else if c == '[' {
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d.scan.step(&d.scan, ']')
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} else {
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// Was inside a function name. Get out of it.
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d.scan.step(&d.scan, '(')
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d.scan.step(&d.scan, ')')
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}
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return item
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}
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// scanWhile processes bytes in d.data[d.off:] until it
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// receives a scan code not equal to op.
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// It updates d.off and returns the new scan code.
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func (d *decodeState) scanWhile(op int) int {
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var newOp int
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for {
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if d.off >= len(d.data) {
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newOp = d.scan.eof()
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d.off = len(d.data) + 1 // mark processed EOF with len+1
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} else {
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c := d.data[d.off]
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d.off++
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newOp = d.scan.step(&d.scan, c)
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}
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if newOp != op {
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break
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}
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}
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return newOp
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}
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// value decodes a JSON value from d.data[d.off:] into the value.
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// it updates d.off to point past the decoded value.
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func (d *decodeState) value(v reflect.Value) {
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if !v.IsValid() {
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_, rest, err := nextValue(d.data[d.off:], &d.nextscan)
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if err != nil {
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d.error(err)
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}
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d.off = len(d.data) - len(rest)
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// d.scan thinks we're still at the beginning of the item.
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// Feed in an empty string - the shortest, simplest value -
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// so that it knows we got to the end of the value.
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if d.scan.redo {
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// rewind.
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d.scan.redo = false
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d.scan.step = stateBeginValue
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}
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d.scan.step(&d.scan, '"')
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d.scan.step(&d.scan, '"')
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n := len(d.scan.parseState)
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if n > 0 && d.scan.parseState[n-1] == parseObjectKey {
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// d.scan thinks we just read an object key; finish the object
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d.scan.step(&d.scan, ':')
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d.scan.step(&d.scan, '"')
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d.scan.step(&d.scan, '"')
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d.scan.step(&d.scan, '}')
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}
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return
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}
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switch op := d.scanWhile(scanSkipSpace); op {
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default:
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d.error(errPhase)
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case scanBeginArray:
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d.array(v)
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case scanBeginObject:
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d.object(v)
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case scanBeginLiteral:
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d.literal(v)
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case scanBeginName:
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d.name(v)
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}
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}
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type unquotedValue struct{}
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// valueQuoted is like value but decodes a
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// quoted string literal or literal null into an interface value.
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// If it finds anything other than a quoted string literal or null,
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// valueQuoted returns unquotedValue{}.
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func (d *decodeState) valueQuoted() interface{} {
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switch op := d.scanWhile(scanSkipSpace); op {
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default:
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d.error(errPhase)
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case scanBeginArray:
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d.array(reflect.Value{})
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case scanBeginObject:
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d.object(reflect.Value{})
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case scanBeginName:
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switch v := d.nameInterface().(type) {
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case nil, string:
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return v
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}
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case scanBeginLiteral:
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switch v := d.literalInterface().(type) {
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case nil, string:
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return v
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}
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}
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return unquotedValue{}
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}
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// indirect walks down v allocating pointers as needed,
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// until it gets to a non-pointer.
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// if it encounters an Unmarshaler, indirect stops and returns that.
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// if decodingNull is true, indirect stops at the last pointer so it can be set to nil.
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func (d *decodeState) indirect(v reflect.Value, decodingNull bool) (Unmarshaler, encoding.TextUnmarshaler, reflect.Value) {
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// If v is a named type and is addressable,
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// start with its address, so that if the type has pointer methods,
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// we find them.
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if v.Kind() != reflect.Ptr && v.Type().Name() != "" && v.CanAddr() {
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v = v.Addr()
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}
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for {
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// Load value from interface, but only if the result will be
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// usefully addressable.
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if v.Kind() == reflect.Interface && !v.IsNil() {
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e := v.Elem()
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if e.Kind() == reflect.Ptr && !e.IsNil() && (!decodingNull || e.Elem().Kind() == reflect.Ptr) {
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v = e
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continue
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}
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}
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if v.Kind() != reflect.Ptr {
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break
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}
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if v.Elem().Kind() != reflect.Ptr && decodingNull && v.CanSet() {
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break
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}
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if v.IsNil() {
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v.Set(reflect.New(v.Type().Elem()))
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}
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if v.Type().NumMethod() > 0 {
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if u, ok := v.Interface().(Unmarshaler); ok {
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return u, nil, v
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}
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if u, ok := v.Interface().(encoding.TextUnmarshaler); ok {
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return nil, u, v
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}
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}
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v = v.Elem()
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}
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return nil, nil, v
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}
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// array consumes an array from d.data[d.off-1:], decoding into the value v.
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// the first byte of the array ('[') has been read already.
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func (d *decodeState) array(v reflect.Value) {
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// Check for unmarshaler.
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u, ut, pv := d.indirect(v, false)
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if u != nil {
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d.off--
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err := u.UnmarshalJSON(d.next())
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if err != nil {
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d.error(err)
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}
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return
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}
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if ut != nil {
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d.saveError(&UnmarshalTypeError{"array", v.Type(), int64(d.off)})
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d.off--
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d.next()
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return
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}
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v = pv
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// Check type of target.
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switch v.Kind() {
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case reflect.Interface:
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if v.NumMethod() == 0 {
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// Decoding into nil interface? Switch to non-reflect code.
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v.Set(reflect.ValueOf(d.arrayInterface()))
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return
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}
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// Otherwise it's invalid.
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fallthrough
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default:
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d.saveError(&UnmarshalTypeError{"array", v.Type(), int64(d.off)})
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d.off--
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d.next()
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return
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case reflect.Array:
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case reflect.Slice:
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break
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}
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i := 0
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for {
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// Look ahead for ] - can only happen on first iteration.
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op := d.scanWhile(scanSkipSpace)
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if op == scanEndArray {
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break
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}
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// Back up so d.value can have the byte we just read.
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d.off--
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d.scan.undo(op)
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// Get element of array, growing if necessary.
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if v.Kind() == reflect.Slice {
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// Grow slice if necessary
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if i >= v.Cap() {
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newcap := v.Cap() + v.Cap()/2
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if newcap < 4 {
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newcap = 4
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}
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newv := reflect.MakeSlice(v.Type(), v.Len(), newcap)
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reflect.Copy(newv, v)
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v.Set(newv)
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}
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if i >= v.Len() {
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v.SetLen(i + 1)
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}
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}
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if i < v.Len() {
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// Decode into element.
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d.value(v.Index(i))
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} else {
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// Ran out of fixed array: skip.
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d.value(reflect.Value{})
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}
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i++
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// Next token must be , or ].
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op = d.scanWhile(scanSkipSpace)
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if op == scanEndArray {
|
|
break
|
|
}
|
|
if op != scanArrayValue {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
|
|
if i < v.Len() {
|
|
if v.Kind() == reflect.Array {
|
|
// Array. Zero the rest.
|
|
z := reflect.Zero(v.Type().Elem())
|
|
for ; i < v.Len(); i++ {
|
|
v.Index(i).Set(z)
|
|
}
|
|
} else {
|
|
v.SetLen(i)
|
|
}
|
|
}
|
|
if i == 0 && v.Kind() == reflect.Slice {
|
|
v.Set(reflect.MakeSlice(v.Type(), 0, 0))
|
|
}
|
|
}
|
|
|
|
var nullLiteral = []byte("null")
|
|
var textUnmarshalerType = reflect.TypeOf(new(encoding.TextUnmarshaler)).Elem()
|
|
|
|
// object consumes an object from d.data[d.off-1:], decoding into the value v.
|
|
// the first byte ('{') of the object has been read already.
|
|
func (d *decodeState) object(v reflect.Value) {
|
|
// Check for unmarshaler.
|
|
u, ut, pv := d.indirect(v, false)
|
|
if d.storeKeyed(pv) {
|
|
return
|
|
}
|
|
if u != nil {
|
|
d.off--
|
|
err := u.UnmarshalJSON(d.next())
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return
|
|
}
|
|
if ut != nil {
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over { } in input
|
|
return
|
|
}
|
|
v = pv
|
|
|
|
// Decoding into nil interface? Switch to non-reflect code.
|
|
if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
|
|
v.Set(reflect.ValueOf(d.objectInterface()))
|
|
return
|
|
}
|
|
|
|
// Check type of target:
|
|
// struct or
|
|
// map[string]T or map[encoding.TextUnmarshaler]T
|
|
switch v.Kind() {
|
|
case reflect.Map:
|
|
// Map key must either have string kind or be an encoding.TextUnmarshaler.
|
|
t := v.Type()
|
|
if t.Key().Kind() != reflect.String &&
|
|
!reflect.PtrTo(t.Key()).Implements(textUnmarshalerType) {
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over { } in input
|
|
return
|
|
}
|
|
if v.IsNil() {
|
|
v.Set(reflect.MakeMap(t))
|
|
}
|
|
case reflect.Struct:
|
|
|
|
default:
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over { } in input
|
|
return
|
|
}
|
|
|
|
var mapElem reflect.Value
|
|
|
|
empty := true
|
|
for {
|
|
// Read opening " of string key or closing }.
|
|
op := d.scanWhile(scanSkipSpace)
|
|
if op == scanEndObject {
|
|
if !empty && !d.ext.trailingCommas {
|
|
d.syntaxError("beginning of object key string")
|
|
}
|
|
break
|
|
}
|
|
empty = false
|
|
if op == scanBeginName {
|
|
if !d.ext.unquotedKeys {
|
|
d.syntaxError("beginning of object key string")
|
|
}
|
|
} else if op != scanBeginLiteral {
|
|
d.error(errPhase)
|
|
}
|
|
unquotedKey := op == scanBeginName
|
|
|
|
// Read key.
|
|
start := d.off - 1
|
|
op = d.scanWhile(scanContinue)
|
|
item := d.data[start : d.off-1]
|
|
var key []byte
|
|
if unquotedKey {
|
|
key = item
|
|
// TODO Fix code below to quote item when necessary.
|
|
} else {
|
|
var ok bool
|
|
key, ok = unquoteBytes(item)
|
|
if !ok {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
|
|
// Figure out field corresponding to key.
|
|
var subv reflect.Value
|
|
destring := false // whether the value is wrapped in a string to be decoded first
|
|
|
|
if v.Kind() == reflect.Map {
|
|
elemType := v.Type().Elem()
|
|
if !mapElem.IsValid() {
|
|
mapElem = reflect.New(elemType).Elem()
|
|
} else {
|
|
mapElem.Set(reflect.Zero(elemType))
|
|
}
|
|
subv = mapElem
|
|
} else {
|
|
var f *field
|
|
fields := cachedTypeFields(v.Type())
|
|
for i := range fields {
|
|
ff := &fields[i]
|
|
if bytes.Equal(ff.nameBytes, key) {
|
|
f = ff
|
|
break
|
|
}
|
|
if f == nil && ff.equalFold(ff.nameBytes, key) {
|
|
f = ff
|
|
}
|
|
}
|
|
if f != nil {
|
|
subv = v
|
|
destring = f.quoted
|
|
for _, i := range f.index {
|
|
if subv.Kind() == reflect.Ptr {
|
|
if subv.IsNil() {
|
|
subv.Set(reflect.New(subv.Type().Elem()))
|
|
}
|
|
subv = subv.Elem()
|
|
}
|
|
subv = subv.Field(i)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read : before value.
|
|
if op == scanSkipSpace {
|
|
op = d.scanWhile(scanSkipSpace)
|
|
}
|
|
if op != scanObjectKey {
|
|
d.error(errPhase)
|
|
}
|
|
|
|
// Read value.
|
|
if destring {
|
|
switch qv := d.valueQuoted().(type) {
|
|
case nil:
|
|
d.literalStore(nullLiteral, subv, false)
|
|
case string:
|
|
d.literalStore([]byte(qv), subv, true)
|
|
default:
|
|
d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal unquoted value into %v", subv.Type()))
|
|
}
|
|
} else {
|
|
d.value(subv)
|
|
}
|
|
|
|
// Write value back to map;
|
|
// if using struct, subv points into struct already.
|
|
if v.Kind() == reflect.Map {
|
|
kt := v.Type().Key()
|
|
var kv reflect.Value
|
|
switch {
|
|
case kt.Kind() == reflect.String:
|
|
kv = reflect.ValueOf(key).Convert(v.Type().Key())
|
|
case reflect.PtrTo(kt).Implements(textUnmarshalerType):
|
|
kv = reflect.New(v.Type().Key())
|
|
d.literalStore(item, kv, true)
|
|
kv = kv.Elem()
|
|
default:
|
|
panic("json: Unexpected key type") // should never occur
|
|
}
|
|
v.SetMapIndex(kv, subv)
|
|
}
|
|
|
|
// Next token must be , or }.
|
|
op = d.scanWhile(scanSkipSpace)
|
|
if op == scanEndObject {
|
|
break
|
|
}
|
|
if op != scanObjectValue {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
}
|
|
|
|
// isNull returns whether there's a null literal at the provided offset.
|
|
func (d *decodeState) isNull(off int) bool {
|
|
if off+4 >= len(d.data) || d.data[off] != 'n' || d.data[off+1] != 'u' || d.data[off+2] != 'l' || d.data[off+3] != 'l' {
|
|
return false
|
|
}
|
|
d.nextscan.reset()
|
|
for i, c := range d.data[off:] {
|
|
if i > 4 {
|
|
return false
|
|
}
|
|
switch d.nextscan.step(&d.nextscan, c) {
|
|
case scanContinue, scanBeginName:
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
return true
|
|
}
|
|
|
|
// name consumes a const or function from d.data[d.off-1:], decoding into the value v.
|
|
// the first byte of the function name has been read already.
|
|
func (d *decodeState) name(v reflect.Value) {
|
|
if d.isNull(d.off-1) {
|
|
d.literal(v)
|
|
return
|
|
}
|
|
|
|
// Check for unmarshaler.
|
|
u, ut, pv := d.indirect(v, false)
|
|
if d.storeKeyed(pv) {
|
|
return
|
|
}
|
|
if u != nil {
|
|
d.off--
|
|
err := u.UnmarshalJSON(d.next())
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return
|
|
}
|
|
if ut != nil {
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over function in input
|
|
return
|
|
}
|
|
v = pv
|
|
|
|
// Decoding into nil interface? Switch to non-reflect code.
|
|
if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
|
|
out := d.nameInterface()
|
|
if out == nil {
|
|
v.Set(reflect.Zero(v.Type()))
|
|
} else {
|
|
v.Set(reflect.ValueOf(out))
|
|
}
|
|
return
|
|
}
|
|
|
|
nameStart := d.off - 1
|
|
|
|
op := d.scanWhile(scanContinue)
|
|
|
|
name := d.data[nameStart : d.off-1]
|
|
if op != scanParam {
|
|
// Back up so the byte just read is consumed next.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
if l, ok := d.convertLiteral(name); ok {
|
|
d.storeValue(v, l)
|
|
return
|
|
}
|
|
d.error(&SyntaxError{fmt.Sprintf("json: unknown constant %q", name), int64(d.off)})
|
|
}
|
|
|
|
funcName := string(name)
|
|
funcData := d.ext.funcs[funcName]
|
|
if funcData.key == "" {
|
|
d.error(fmt.Errorf("json: unknown function %q", funcName))
|
|
}
|
|
|
|
// Check type of target:
|
|
// struct or
|
|
// map[string]T or map[encoding.TextUnmarshaler]T
|
|
switch v.Kind() {
|
|
case reflect.Map:
|
|
// Map key must either have string kind or be an encoding.TextUnmarshaler.
|
|
t := v.Type()
|
|
if t.Key().Kind() != reflect.String &&
|
|
!reflect.PtrTo(t.Key()).Implements(textUnmarshalerType) {
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over { } in input
|
|
return
|
|
}
|
|
if v.IsNil() {
|
|
v.Set(reflect.MakeMap(t))
|
|
}
|
|
case reflect.Struct:
|
|
|
|
default:
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
d.off--
|
|
d.next() // skip over { } in input
|
|
return
|
|
}
|
|
|
|
// TODO Fix case of func field as map.
|
|
//topv := v
|
|
|
|
// Figure out field corresponding to function.
|
|
key := []byte(funcData.key)
|
|
if v.Kind() == reflect.Map {
|
|
elemType := v.Type().Elem()
|
|
v = reflect.New(elemType).Elem()
|
|
} else {
|
|
var f *field
|
|
fields := cachedTypeFields(v.Type())
|
|
for i := range fields {
|
|
ff := &fields[i]
|
|
if bytes.Equal(ff.nameBytes, key) {
|
|
f = ff
|
|
break
|
|
}
|
|
if f == nil && ff.equalFold(ff.nameBytes, key) {
|
|
f = ff
|
|
}
|
|
}
|
|
if f != nil {
|
|
for _, i := range f.index {
|
|
if v.Kind() == reflect.Ptr {
|
|
if v.IsNil() {
|
|
v.Set(reflect.New(v.Type().Elem()))
|
|
}
|
|
v = v.Elem()
|
|
}
|
|
v = v.Field(i)
|
|
}
|
|
if v.Kind() == reflect.Ptr {
|
|
if v.IsNil() {
|
|
v.Set(reflect.New(v.Type().Elem()))
|
|
}
|
|
v = v.Elem()
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check for unmarshaler on func field itself.
|
|
u, ut, pv = d.indirect(v, false)
|
|
if u != nil {
|
|
d.off = nameStart
|
|
err := u.UnmarshalJSON(d.next())
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return
|
|
}
|
|
|
|
var mapElem reflect.Value
|
|
|
|
// Parse function arguments.
|
|
for i := 0; ; i++ {
|
|
// closing ) - can only happen on first iteration.
|
|
op := d.scanWhile(scanSkipSpace)
|
|
if op == scanEndParams {
|
|
break
|
|
}
|
|
|
|
// Back up so d.value can have the byte we just read.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
|
|
if i >= len(funcData.args) {
|
|
d.error(fmt.Errorf("json: too many arguments for function %s", funcName))
|
|
}
|
|
key := []byte(funcData.args[i])
|
|
|
|
// Figure out field corresponding to key.
|
|
var subv reflect.Value
|
|
destring := false // whether the value is wrapped in a string to be decoded first
|
|
|
|
if v.Kind() == reflect.Map {
|
|
elemType := v.Type().Elem()
|
|
if !mapElem.IsValid() {
|
|
mapElem = reflect.New(elemType).Elem()
|
|
} else {
|
|
mapElem.Set(reflect.Zero(elemType))
|
|
}
|
|
subv = mapElem
|
|
} else {
|
|
var f *field
|
|
fields := cachedTypeFields(v.Type())
|
|
for i := range fields {
|
|
ff := &fields[i]
|
|
if bytes.Equal(ff.nameBytes, key) {
|
|
f = ff
|
|
break
|
|
}
|
|
if f == nil && ff.equalFold(ff.nameBytes, key) {
|
|
f = ff
|
|
}
|
|
}
|
|
if f != nil {
|
|
subv = v
|
|
destring = f.quoted
|
|
for _, i := range f.index {
|
|
if subv.Kind() == reflect.Ptr {
|
|
if subv.IsNil() {
|
|
subv.Set(reflect.New(subv.Type().Elem()))
|
|
}
|
|
subv = subv.Elem()
|
|
}
|
|
subv = subv.Field(i)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read value.
|
|
if destring {
|
|
switch qv := d.valueQuoted().(type) {
|
|
case nil:
|
|
d.literalStore(nullLiteral, subv, false)
|
|
case string:
|
|
d.literalStore([]byte(qv), subv, true)
|
|
default:
|
|
d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal unquoted value into %v", subv.Type()))
|
|
}
|
|
} else {
|
|
d.value(subv)
|
|
}
|
|
|
|
// Write value back to map;
|
|
// if using struct, subv points into struct already.
|
|
if v.Kind() == reflect.Map {
|
|
kt := v.Type().Key()
|
|
var kv reflect.Value
|
|
switch {
|
|
case kt.Kind() == reflect.String:
|
|
kv = reflect.ValueOf(key).Convert(v.Type().Key())
|
|
case reflect.PtrTo(kt).Implements(textUnmarshalerType):
|
|
kv = reflect.New(v.Type().Key())
|
|
d.literalStore(key, kv, true)
|
|
kv = kv.Elem()
|
|
default:
|
|
panic("json: Unexpected key type") // should never occur
|
|
}
|
|
v.SetMapIndex(kv, subv)
|
|
}
|
|
|
|
// Next token must be , or ).
|
|
op = d.scanWhile(scanSkipSpace)
|
|
if op == scanEndParams {
|
|
break
|
|
}
|
|
if op != scanParam {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
}
|
|
|
|
// keyed attempts to decode an object or function using a keyed doc extension,
|
|
// and returns the value and true on success, or nil and false otherwise.
|
|
func (d *decodeState) keyed() (interface{}, bool) {
|
|
if len(d.ext.keyed) == 0 {
|
|
return nil, false
|
|
}
|
|
|
|
unquote := false
|
|
|
|
// Look-ahead first key to check for a keyed document extension.
|
|
d.nextscan.reset()
|
|
var start, end int
|
|
for i, c := range d.data[d.off-1:] {
|
|
switch op := d.nextscan.step(&d.nextscan, c); op {
|
|
case scanSkipSpace, scanContinue, scanBeginObject:
|
|
continue
|
|
case scanBeginLiteral, scanBeginName:
|
|
unquote = op == scanBeginLiteral
|
|
start = i
|
|
continue
|
|
}
|
|
end = i
|
|
break
|
|
}
|
|
|
|
name := d.data[d.off-1+start : d.off-1+end]
|
|
|
|
var key []byte
|
|
var ok bool
|
|
if unquote {
|
|
key, ok = unquoteBytes(name)
|
|
if !ok {
|
|
d.error(errPhase)
|
|
}
|
|
} else {
|
|
funcData, ok := d.ext.funcs[string(name)]
|
|
if !ok {
|
|
return nil, false
|
|
}
|
|
key = []byte(funcData.key)
|
|
}
|
|
|
|
decode, ok := d.ext.keyed[string(key)]
|
|
if !ok {
|
|
return nil, false
|
|
}
|
|
|
|
d.off--
|
|
out, err := decode(d.next())
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return out, true
|
|
}
|
|
|
|
func (d *decodeState) storeKeyed(v reflect.Value) bool {
|
|
keyed, ok := d.keyed()
|
|
if !ok {
|
|
return false
|
|
}
|
|
d.storeValue(v, keyed)
|
|
return true
|
|
}
|
|
|
|
var (
|
|
trueBytes = []byte("true")
|
|
falseBytes = []byte("false")
|
|
nullBytes = []byte("null")
|
|
)
|
|
|
|
func (d *decodeState) storeValue(v reflect.Value, from interface{}) {
|
|
switch from {
|
|
case nil:
|
|
d.literalStore(nullBytes, v, false)
|
|
return
|
|
case true:
|
|
d.literalStore(trueBytes, v, false)
|
|
return
|
|
case false:
|
|
d.literalStore(falseBytes, v, false)
|
|
return
|
|
}
|
|
fromv := reflect.ValueOf(from)
|
|
for fromv.Kind() == reflect.Ptr && !fromv.IsNil() {
|
|
fromv = fromv.Elem()
|
|
}
|
|
fromt := fromv.Type()
|
|
for v.Kind() == reflect.Ptr && !v.IsNil() {
|
|
v = v.Elem()
|
|
}
|
|
vt := v.Type()
|
|
if fromt.AssignableTo(vt) {
|
|
v.Set(fromv)
|
|
} else if fromt.ConvertibleTo(vt) {
|
|
v.Set(fromv.Convert(vt))
|
|
} else {
|
|
d.saveError(&UnmarshalTypeError{"object", v.Type(), int64(d.off)})
|
|
}
|
|
}
|
|
|
|
func (d *decodeState) convertLiteral(name []byte) (interface{}, bool) {
|
|
if len(name) == 0 {
|
|
return nil, false
|
|
}
|
|
switch name[0] {
|
|
case 't':
|
|
if bytes.Equal(name, trueBytes) {
|
|
return true, true
|
|
}
|
|
case 'f':
|
|
if bytes.Equal(name, falseBytes) {
|
|
return false, true
|
|
}
|
|
case 'n':
|
|
if bytes.Equal(name, nullBytes) {
|
|
return nil, true
|
|
}
|
|
}
|
|
if l, ok := d.ext.consts[string(name)]; ok {
|
|
return l, true
|
|
}
|
|
return nil, false
|
|
}
|
|
|
|
// literal consumes a literal from d.data[d.off-1:], decoding into the value v.
|
|
// The first byte of the literal has been read already
|
|
// (that's how the caller knows it's a literal).
|
|
func (d *decodeState) literal(v reflect.Value) {
|
|
// All bytes inside literal return scanContinue op code.
|
|
start := d.off - 1
|
|
op := d.scanWhile(scanContinue)
|
|
|
|
// Scan read one byte too far; back up.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
|
|
d.literalStore(d.data[start:d.off], v, false)
|
|
}
|
|
|
|
// convertNumber converts the number literal s to a float64 or a Number
|
|
// depending on the setting of d.useNumber.
|
|
func (d *decodeState) convertNumber(s string) (interface{}, error) {
|
|
if d.useNumber {
|
|
return Number(s), nil
|
|
}
|
|
f, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
return nil, &UnmarshalTypeError{"number " + s, reflect.TypeOf(0.0), int64(d.off)}
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
var numberType = reflect.TypeOf(Number(""))
|
|
|
|
// literalStore decodes a literal stored in item into v.
|
|
//
|
|
// fromQuoted indicates whether this literal came from unwrapping a
|
|
// string from the ",string" struct tag option. this is used only to
|
|
// produce more helpful error messages.
|
|
func (d *decodeState) literalStore(item []byte, v reflect.Value, fromQuoted bool) {
|
|
// Check for unmarshaler.
|
|
if len(item) == 0 {
|
|
//Empty string given
|
|
d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
return
|
|
}
|
|
wantptr := item[0] == 'n' // null
|
|
u, ut, pv := d.indirect(v, wantptr)
|
|
if u != nil {
|
|
err := u.UnmarshalJSON(item)
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return
|
|
}
|
|
if ut != nil {
|
|
if item[0] != '"' {
|
|
if fromQuoted {
|
|
d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
|
|
}
|
|
return
|
|
}
|
|
s, ok := unquoteBytes(item)
|
|
if !ok {
|
|
if fromQuoted {
|
|
d.error(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
err := ut.UnmarshalText(s)
|
|
if err != nil {
|
|
d.error(err)
|
|
}
|
|
return
|
|
}
|
|
|
|
v = pv
|
|
|
|
switch c := item[0]; c {
|
|
case 'n': // null
|
|
switch v.Kind() {
|
|
case reflect.Interface, reflect.Ptr, reflect.Map, reflect.Slice:
|
|
v.Set(reflect.Zero(v.Type()))
|
|
// otherwise, ignore null for primitives/string
|
|
}
|
|
case 't', 'f': // true, false
|
|
value := c == 't'
|
|
switch v.Kind() {
|
|
default:
|
|
if fromQuoted {
|
|
d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.saveError(&UnmarshalTypeError{"bool", v.Type(), int64(d.off)})
|
|
}
|
|
case reflect.Bool:
|
|
v.SetBool(value)
|
|
case reflect.Interface:
|
|
if v.NumMethod() == 0 {
|
|
v.Set(reflect.ValueOf(value))
|
|
} else {
|
|
d.saveError(&UnmarshalTypeError{"bool", v.Type(), int64(d.off)})
|
|
}
|
|
}
|
|
|
|
case '"': // string
|
|
s, ok := unquoteBytes(item)
|
|
if !ok {
|
|
if fromQuoted {
|
|
d.error(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
switch v.Kind() {
|
|
default:
|
|
d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
|
|
case reflect.Slice:
|
|
if v.Type().Elem().Kind() != reflect.Uint8 {
|
|
d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
|
|
break
|
|
}
|
|
b := make([]byte, base64.StdEncoding.DecodedLen(len(s)))
|
|
n, err := base64.StdEncoding.Decode(b, s)
|
|
if err != nil {
|
|
d.saveError(err)
|
|
break
|
|
}
|
|
v.SetBytes(b[:n])
|
|
case reflect.String:
|
|
v.SetString(string(s))
|
|
case reflect.Interface:
|
|
if v.NumMethod() == 0 {
|
|
v.Set(reflect.ValueOf(string(s)))
|
|
} else {
|
|
d.saveError(&UnmarshalTypeError{"string", v.Type(), int64(d.off)})
|
|
}
|
|
}
|
|
|
|
default: // number
|
|
if c != '-' && (c < '0' || c > '9') {
|
|
if fromQuoted {
|
|
d.error(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
s := string(item)
|
|
switch v.Kind() {
|
|
default:
|
|
if v.Kind() == reflect.String && v.Type() == numberType {
|
|
v.SetString(s)
|
|
if !isValidNumber(s) {
|
|
d.error(fmt.Errorf("json: invalid number literal, trying to unmarshal %q into Number", item))
|
|
}
|
|
break
|
|
}
|
|
if fromQuoted {
|
|
d.error(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()))
|
|
} else {
|
|
d.error(&UnmarshalTypeError{"number", v.Type(), int64(d.off)})
|
|
}
|
|
case reflect.Interface:
|
|
n, err := d.convertNumber(s)
|
|
if err != nil {
|
|
d.saveError(err)
|
|
break
|
|
}
|
|
if v.NumMethod() != 0 {
|
|
d.saveError(&UnmarshalTypeError{"number", v.Type(), int64(d.off)})
|
|
break
|
|
}
|
|
v.Set(reflect.ValueOf(n))
|
|
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
n, err := strconv.ParseInt(s, 10, 64)
|
|
if err != nil || v.OverflowInt(n) {
|
|
d.saveError(&UnmarshalTypeError{"number " + s, v.Type(), int64(d.off)})
|
|
break
|
|
}
|
|
v.SetInt(n)
|
|
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
n, err := strconv.ParseUint(s, 10, 64)
|
|
if err != nil || v.OverflowUint(n) {
|
|
d.saveError(&UnmarshalTypeError{"number " + s, v.Type(), int64(d.off)})
|
|
break
|
|
}
|
|
v.SetUint(n)
|
|
|
|
case reflect.Float32, reflect.Float64:
|
|
n, err := strconv.ParseFloat(s, v.Type().Bits())
|
|
if err != nil || v.OverflowFloat(n) {
|
|
d.saveError(&UnmarshalTypeError{"number " + s, v.Type(), int64(d.off)})
|
|
break
|
|
}
|
|
v.SetFloat(n)
|
|
}
|
|
}
|
|
}
|
|
|
|
// The xxxInterface routines build up a value to be stored
|
|
// in an empty interface. They are not strictly necessary,
|
|
// but they avoid the weight of reflection in this common case.
|
|
|
|
// valueInterface is like value but returns interface{}
|
|
func (d *decodeState) valueInterface() interface{} {
|
|
switch d.scanWhile(scanSkipSpace) {
|
|
default:
|
|
d.error(errPhase)
|
|
panic("unreachable")
|
|
case scanBeginArray:
|
|
return d.arrayInterface()
|
|
case scanBeginObject:
|
|
return d.objectInterface()
|
|
case scanBeginLiteral:
|
|
return d.literalInterface()
|
|
case scanBeginName:
|
|
return d.nameInterface()
|
|
}
|
|
}
|
|
|
|
func (d *decodeState) syntaxError(expected string) {
|
|
msg := fmt.Sprintf("invalid character '%c' looking for %s", d.data[d.off-1], expected)
|
|
d.error(&SyntaxError{msg, int64(d.off)})
|
|
}
|
|
|
|
// arrayInterface is like array but returns []interface{}.
|
|
func (d *decodeState) arrayInterface() []interface{} {
|
|
var v = make([]interface{}, 0)
|
|
for {
|
|
// Look ahead for ] - can only happen on first iteration.
|
|
op := d.scanWhile(scanSkipSpace)
|
|
if op == scanEndArray {
|
|
if len(v) > 0 && !d.ext.trailingCommas {
|
|
d.syntaxError("beginning of value")
|
|
}
|
|
break
|
|
}
|
|
|
|
// Back up so d.value can have the byte we just read.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
|
|
v = append(v, d.valueInterface())
|
|
|
|
// Next token must be , or ].
|
|
op = d.scanWhile(scanSkipSpace)
|
|
if op == scanEndArray {
|
|
break
|
|
}
|
|
if op != scanArrayValue {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
return v
|
|
}
|
|
|
|
// objectInterface is like object but returns map[string]interface{}.
|
|
func (d *decodeState) objectInterface() interface{} {
|
|
v, ok := d.keyed()
|
|
if ok {
|
|
return v
|
|
}
|
|
|
|
m := make(map[string]interface{})
|
|
for {
|
|
// Read opening " of string key or closing }.
|
|
op := d.scanWhile(scanSkipSpace)
|
|
if op == scanEndObject {
|
|
if len(m) > 0 && !d.ext.trailingCommas {
|
|
d.syntaxError("beginning of object key string")
|
|
}
|
|
break
|
|
}
|
|
if op == scanBeginName {
|
|
if !d.ext.unquotedKeys {
|
|
d.syntaxError("beginning of object key string")
|
|
}
|
|
} else if op != scanBeginLiteral {
|
|
d.error(errPhase)
|
|
}
|
|
unquotedKey := op == scanBeginName
|
|
|
|
// Read string key.
|
|
start := d.off - 1
|
|
op = d.scanWhile(scanContinue)
|
|
item := d.data[start : d.off-1]
|
|
var key string
|
|
if unquotedKey {
|
|
key = string(item)
|
|
} else {
|
|
var ok bool
|
|
key, ok = unquote(item)
|
|
if !ok {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
|
|
// Read : before value.
|
|
if op == scanSkipSpace {
|
|
op = d.scanWhile(scanSkipSpace)
|
|
}
|
|
if op != scanObjectKey {
|
|
d.error(errPhase)
|
|
}
|
|
|
|
// Read value.
|
|
m[key] = d.valueInterface()
|
|
|
|
// Next token must be , or }.
|
|
op = d.scanWhile(scanSkipSpace)
|
|
if op == scanEndObject {
|
|
break
|
|
}
|
|
if op != scanObjectValue {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
return m
|
|
}
|
|
|
|
// literalInterface is like literal but returns an interface value.
|
|
func (d *decodeState) literalInterface() interface{} {
|
|
// All bytes inside literal return scanContinue op code.
|
|
start := d.off - 1
|
|
op := d.scanWhile(scanContinue)
|
|
|
|
// Scan read one byte too far; back up.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
item := d.data[start:d.off]
|
|
|
|
switch c := item[0]; c {
|
|
case 'n': // null
|
|
return nil
|
|
|
|
case 't', 'f': // true, false
|
|
return c == 't'
|
|
|
|
case '"': // string
|
|
s, ok := unquote(item)
|
|
if !ok {
|
|
d.error(errPhase)
|
|
}
|
|
return s
|
|
|
|
default: // number
|
|
if c != '-' && (c < '0' || c > '9') {
|
|
d.error(errPhase)
|
|
}
|
|
n, err := d.convertNumber(string(item))
|
|
if err != nil {
|
|
d.saveError(err)
|
|
}
|
|
return n
|
|
}
|
|
}
|
|
|
|
// nameInterface is like function but returns map[string]interface{}.
|
|
func (d *decodeState) nameInterface() interface{} {
|
|
v, ok := d.keyed()
|
|
if ok {
|
|
return v
|
|
}
|
|
|
|
nameStart := d.off - 1
|
|
|
|
op := d.scanWhile(scanContinue)
|
|
|
|
name := d.data[nameStart : d.off-1]
|
|
if op != scanParam {
|
|
// Back up so the byte just read is consumed next.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
if l, ok := d.convertLiteral(name); ok {
|
|
return l
|
|
}
|
|
d.error(&SyntaxError{fmt.Sprintf("json: unknown constant %q", name), int64(d.off)})
|
|
}
|
|
|
|
funcName := string(name)
|
|
funcData := d.ext.funcs[funcName]
|
|
if funcData.key == "" {
|
|
d.error(fmt.Errorf("json: unknown function %q", funcName))
|
|
}
|
|
|
|
m := make(map[string]interface{})
|
|
for i := 0; ; i++ {
|
|
// Look ahead for ) - can only happen on first iteration.
|
|
op := d.scanWhile(scanSkipSpace)
|
|
if op == scanEndParams {
|
|
break
|
|
}
|
|
|
|
// Back up so d.value can have the byte we just read.
|
|
d.off--
|
|
d.scan.undo(op)
|
|
|
|
if i >= len(funcData.args) {
|
|
d.error(fmt.Errorf("json: too many arguments for function %s", funcName))
|
|
}
|
|
m[funcData.args[i]] = d.valueInterface()
|
|
|
|
// Next token must be , or ).
|
|
op = d.scanWhile(scanSkipSpace)
|
|
if op == scanEndParams {
|
|
break
|
|
}
|
|
if op != scanParam {
|
|
d.error(errPhase)
|
|
}
|
|
}
|
|
return map[string]interface{}{funcData.key: m}
|
|
}
|
|
|
|
// getu4 decodes \uXXXX from the beginning of s, returning the hex value,
|
|
// or it returns -1.
|
|
func getu4(s []byte) rune {
|
|
if len(s) < 6 || s[0] != '\\' || s[1] != 'u' {
|
|
return -1
|
|
}
|
|
r, err := strconv.ParseUint(string(s[2:6]), 16, 64)
|
|
if err != nil {
|
|
return -1
|
|
}
|
|
return rune(r)
|
|
}
|
|
|
|
// unquote converts a quoted JSON string literal s into an actual string t.
|
|
// The rules are different than for Go, so cannot use strconv.Unquote.
|
|
func unquote(s []byte) (t string, ok bool) {
|
|
s, ok = unquoteBytes(s)
|
|
t = string(s)
|
|
return
|
|
}
|
|
|
|
func unquoteBytes(s []byte) (t []byte, ok bool) {
|
|
if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' {
|
|
return
|
|
}
|
|
s = s[1 : len(s)-1]
|
|
|
|
// Check for unusual characters. If there are none,
|
|
// then no unquoting is needed, so return a slice of the
|
|
// original bytes.
|
|
r := 0
|
|
for r < len(s) {
|
|
c := s[r]
|
|
if c == '\\' || c == '"' || c < ' ' {
|
|
break
|
|
}
|
|
if c < utf8.RuneSelf {
|
|
r++
|
|
continue
|
|
}
|
|
rr, size := utf8.DecodeRune(s[r:])
|
|
if rr == utf8.RuneError && size == 1 {
|
|
break
|
|
}
|
|
r += size
|
|
}
|
|
if r == len(s) {
|
|
return s, true
|
|
}
|
|
|
|
b := make([]byte, len(s)+2*utf8.UTFMax)
|
|
w := copy(b, s[0:r])
|
|
for r < len(s) {
|
|
// Out of room? Can only happen if s is full of
|
|
// malformed UTF-8 and we're replacing each
|
|
// byte with RuneError.
|
|
if w >= len(b)-2*utf8.UTFMax {
|
|
nb := make([]byte, (len(b)+utf8.UTFMax)*2)
|
|
copy(nb, b[0:w])
|
|
b = nb
|
|
}
|
|
switch c := s[r]; {
|
|
case c == '\\':
|
|
r++
|
|
if r >= len(s) {
|
|
return
|
|
}
|
|
switch s[r] {
|
|
default:
|
|
return
|
|
case '"', '\\', '/', '\'':
|
|
b[w] = s[r]
|
|
r++
|
|
w++
|
|
case 'b':
|
|
b[w] = '\b'
|
|
r++
|
|
w++
|
|
case 'f':
|
|
b[w] = '\f'
|
|
r++
|
|
w++
|
|
case 'n':
|
|
b[w] = '\n'
|
|
r++
|
|
w++
|
|
case 'r':
|
|
b[w] = '\r'
|
|
r++
|
|
w++
|
|
case 't':
|
|
b[w] = '\t'
|
|
r++
|
|
w++
|
|
case 'u':
|
|
r--
|
|
rr := getu4(s[r:])
|
|
if rr < 0 {
|
|
return
|
|
}
|
|
r += 6
|
|
if utf16.IsSurrogate(rr) {
|
|
rr1 := getu4(s[r:])
|
|
if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar {
|
|
// A valid pair; consume.
|
|
r += 6
|
|
w += utf8.EncodeRune(b[w:], dec)
|
|
break
|
|
}
|
|
// Invalid surrogate; fall back to replacement rune.
|
|
rr = unicode.ReplacementChar
|
|
}
|
|
w += utf8.EncodeRune(b[w:], rr)
|
|
}
|
|
|
|
// Quote, control characters are invalid.
|
|
case c == '"', c < ' ':
|
|
return
|
|
|
|
// ASCII
|
|
case c < utf8.RuneSelf:
|
|
b[w] = c
|
|
r++
|
|
w++
|
|
|
|
// Coerce to well-formed UTF-8.
|
|
default:
|
|
rr, size := utf8.DecodeRune(s[r:])
|
|
r += size
|
|
w += utf8.EncodeRune(b[w:], rr)
|
|
}
|
|
}
|
|
return b[0:w], true
|
|
}
|