From 921818bca208f0c70e85ec670074cb3905cbbc82 Mon Sep 17 00:00:00 2001 From: Niall Sheridan Date: Sat, 27 Aug 2016 01:32:30 +0100 Subject: Update dependencies --- vendor/gopkg.in/mgo.v2/internal/json/LICENSE | 27 + vendor/gopkg.in/mgo.v2/internal/json/decode.go | 1685 +++++++++++++++++++++ vendor/gopkg.in/mgo.v2/internal/json/encode.go | 1256 +++++++++++++++ vendor/gopkg.in/mgo.v2/internal/json/extension.go | 95 ++ vendor/gopkg.in/mgo.v2/internal/json/fold.go | 143 ++ vendor/gopkg.in/mgo.v2/internal/json/indent.go | 141 ++ vendor/gopkg.in/mgo.v2/internal/json/scanner.go | 697 +++++++++ vendor/gopkg.in/mgo.v2/internal/json/stream.go | 510 +++++++ vendor/gopkg.in/mgo.v2/internal/json/tags.go | 44 + 9 files changed, 4598 insertions(+) create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/LICENSE create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/decode.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/encode.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/extension.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/fold.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/indent.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/scanner.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/stream.go create mode 100644 vendor/gopkg.in/mgo.v2/internal/json/tags.go (limited to 'vendor/gopkg.in/mgo.v2/internal/json') diff --git a/vendor/gopkg.in/mgo.v2/internal/json/LICENSE b/vendor/gopkg.in/mgo.v2/internal/json/LICENSE new file mode 100644 index 0000000..7448756 --- /dev/null +++ b/vendor/gopkg.in/mgo.v2/internal/json/LICENSE @@ -0,0 +1,27 @@ +Copyright (c) 2012 The Go Authors. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + * Neither the name of Google Inc. nor the names of its +contributors may be used to endorse or promote products derived from +this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/vendor/gopkg.in/mgo.v2/internal/json/decode.go b/vendor/gopkg.in/mgo.v2/internal/json/decode.go new file mode 100644 index 0000000..ce7c7d2 --- /dev/null +++ b/vendor/gopkg.in/mgo.v2/internal/json/decode.go @@ -0,0 +1,1685 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Represents JSON data structure using native Go types: booleans, floats, +// strings, arrays, and maps. + +package json + +import ( + "bytes" + "encoding" + "encoding/base64" + "errors" + "fmt" + "reflect" + "runtime" + "strconv" + "unicode" + "unicode/utf16" + "unicode/utf8" +) + +// Unmarshal parses the JSON-encoded data and stores the result +// in the value pointed to by v. +// +// Unmarshal uses the inverse of the encodings that +// Marshal uses, allocating maps, slices, and pointers as necessary, +// with the following additional rules: +// +// To unmarshal JSON into a pointer, Unmarshal first handles the case of +// the JSON being the JSON literal null. In that case, Unmarshal sets +// the pointer to nil. Otherwise, Unmarshal unmarshals the JSON into +// the value pointed at by the pointer. If the pointer is nil, Unmarshal +// allocates a new value for it to point to. +// +// To unmarshal JSON into a struct, Unmarshal matches incoming object +// keys to the keys used by Marshal (either the struct field name or its tag), +// preferring an exact match but also accepting a case-insensitive match. +// Unmarshal will only set exported fields of the struct. +// +// To unmarshal JSON into an interface value, +// Unmarshal stores one of these in the interface value: +// +// bool, for JSON booleans +// float64, for JSON numbers +// string, for JSON strings +// []interface{}, for JSON arrays +// map[string]interface{}, for JSON objects +// nil for JSON null +// +// To unmarshal a JSON array into a slice, Unmarshal resets the slice length +// to zero and then appends each element to the slice. +// As a special case, to unmarshal an empty JSON array into a slice, +// Unmarshal replaces the slice with a new empty slice. +// +// To unmarshal a JSON array into a Go array, Unmarshal decodes +// JSON array elements into corresponding Go array elements. +// If the Go array is smaller than the JSON array, +// the additional JSON array elements are discarded. +// If the JSON array is smaller than the Go array, +// the additional Go array elements are set to zero values. +// +// To unmarshal a JSON object into a map, Unmarshal first establishes a map to +// use, If the map is nil, Unmarshal allocates a new map. Otherwise Unmarshal +// reuses the existing map, keeping existing entries. Unmarshal then stores key- +// value pairs from the JSON object into the map. The map's key type must +// either be a string or implement encoding.TextUnmarshaler. +// +// If a JSON value is not appropriate for a given target type, +// or if a JSON number overflows the target type, Unmarshal +// skips that field and completes the unmarshaling as best it can. +// If no more serious errors are encountered, Unmarshal returns +// an UnmarshalTypeError describing the earliest such error. +// +// The JSON null value unmarshals into an interface, map, pointer, or slice +// by setting that Go value to nil. Because null is often used in JSON to mean +// ``not present,'' unmarshaling a JSON null into any other Go type has no effect +// on the value and produces no error. +// +// When unmarshaling quoted strings, invalid UTF-8 or +// invalid UTF-16 surrogate pairs are not treated as an error. +// Instead, they are replaced by the Unicode replacement +// character U+FFFD. +// +func Unmarshal(data []byte, v interface{}) error { + // Check for well-formedness. + // Avoids filling out half a data structure + // before discovering a JSON syntax error. + var d decodeState + err := checkValid(data, &d.scan) + if err != nil { + return err + } + + d.init(data) + return d.unmarshal(v) +} + +// Unmarshaler is the interface implemented by types +// that can unmarshal a JSON description of themselves. +// The input can be assumed to be a valid encoding of +// a JSON value. UnmarshalJSON must copy the JSON data +// if it wishes to retain the data after returning. +type Unmarshaler interface { + UnmarshalJSON([]byte) error +} + +// An UnmarshalTypeError describes a JSON value that was +// not appropriate for a value of a specific Go type. +type UnmarshalTypeError struct { + Value string // description of JSON value - "bool", "array", "number -5" + Type reflect.Type // type of Go value it could not be assigned to + Offset int64 // error occurred after reading Offset bytes +} + +func (e *UnmarshalTypeError) Error() string { + return "json: cannot unmarshal " + e.Value + " into Go value of type " + e.Type.String() +} + +// An UnmarshalFieldError describes a JSON object key that +// led to an unexported (and therefore unwritable) struct field. +// (No longer used; kept for compatibility.) +type UnmarshalFieldError struct { + Key string + Type reflect.Type + Field reflect.StructField +} + +func (e *UnmarshalFieldError) Error() string { + return "json: cannot unmarshal object key " + strconv.Quote(e.Key) + " into unexported field " + e.Field.Name + " of type " + e.Type.String() +} + +// An InvalidUnmarshalError describes an invalid argument passed to Unmarshal. +// (The argument to Unmarshal must be a non-nil pointer.) +type InvalidUnmarshalError struct { + Type reflect.Type +} + +func (e *InvalidUnmarshalError) Error() string { + if e.Type == nil { + return "json: Unmarshal(nil)" + } + + if e.Type.Kind() != reflect.Ptr { + return "json: Unmarshal(non-pointer " + e.Type.String() + ")" + } + return "json: Unmarshal(nil " + e.Type.String() + ")" +} + +func (d *decodeState) unmarshal(v interface{}) (err error) { + defer func() { + if r := recover(); r != nil { + if _, ok := r.(runtime.Error); ok { + panic(r) + } + err = r.(error) + } + }() + + rv := reflect.ValueOf(v) + if rv.Kind() != reflect.Ptr || rv.IsNil() { + return &InvalidUnmarshalError{reflect.TypeOf(v)} + } + + d.scan.reset() + // We decode rv not rv.Elem because the Unmarshaler interface + // test must be applied at the top level of the value. + d.value(rv) + return d.savedError +} + +// A Number represents a JSON number literal. +type Number string + +// String returns the literal text of the number. +func (n Number) String() string { return string(n) } + +// Float64 returns the number as a float64. +func (n Number) Float64() (float64, error) { + return strconv.ParseFloat(string(n), 64) +} + +// Int64 returns the number as an int64. +func (n Number) Int64() (int64, error) { + return strconv.ParseInt(string(n), 10, 64) +} + +// isValidNumber reports whether s is a valid JSON number literal. +func isValidNumber(s string) bool { + // This function implements the JSON numbers grammar. + // See https://tools.ietf.org/html/rfc7159#section-6 + // and http://json.org/number.gif + + if s == "" { + return false + } + + // Optional - + if s[0] == '-' { + s = s[1:] + if s == "" { + return false + } + } + + // Digits + switch { + default: + return false + + case s[0] == '0': + s = s[1:] + + case '1' <= s[0] && s[0] <= '9': + s = s[1:] + for len(s) > 0 && '0' <= s[0] && s[0] <= '9' { + s = s[1:] + } + } + + // . followed by 1 or more digits. + if len(s) >= 2 && s[0] == '.' && '0' <= s[1] && s[1] <= '9' { + s = s[2:] + for len(s) > 0 && '0' <= s[0] && s[0] <= '9' { + s = s[1:] + } + } + + // e or E followed by an optional - or + and + // 1 or more digits. + if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') { + s = s[1:] + if s[0] == '+' || s[0] == '-' { + s = s[1:] + if s == "" { + return false + } + } + for len(s) > 0 && '0' <= s[0] && s[0] <= '9' { + s = s[1:] + } + } + + // Make sure we are at the end. + return s == "" +} + +// decodeState represents the state while decoding a JSON value. +type decodeState struct { + data []byte + off int // read offset in data + scan scanner + nextscan scanner // for calls to nextValue + savedError error + useNumber bool + ext Extension +} + +// errPhase is used for errors that should not happen unless +// there is a bug in the JSON decoder or something is editing +// the data slice while the decoder executes. +var errPhase = errors.New("JSON decoder out of sync - data changing underfoot?") + +func (d *decodeState) init(data []byte) *decodeState { + d.data = data + d.off = 0 + d.savedError = nil + return d +} + +// error aborts the decoding by panicking with err. +func (d *decodeState) error(err error) { + panic(err) +} + +// saveError saves the first err it is called with, +// for reporting at the end of the unmarshal. +func (d *decodeState) saveError(err error) { + if d.savedError == nil { + d.savedError = err + } +} + +// next cuts off and returns the next full JSON value in d.data[d.off:]. +// The next value is known to be an object or array, not a literal. +func (d *decodeState) next() []byte { + c := d.data[d.off] + item, rest, err := nextValue(d.data[d.off:], &d.nextscan) + if err != nil { + d.error(err) + } + d.off = len(d.data) - len(rest) + + // Our scanner has seen the opening brace/bracket + // and thinks we're still in the middle of the object. + // invent a closing brace/bracket to get it out. + if c == '{' { + d.scan.step(&d.scan, '}') + } else if c == '[' { + d.scan.step(&d.scan, ']') + } else { + // Was inside a function name. Get out of it. + d.scan.step(&d.scan, '(') + d.scan.step(&d.scan, ')') + } + + return item +} + +// scanWhile processes bytes in d.data[d.off:] until it +// receives a scan code not equal to op. +// It updates d.off and returns the new scan code. +func (d *decodeState) scanWhile(op int) int { + var newOp int + for { + if d.off >= len(d.data) { + newOp = d.scan.eof() + d.off = len(d.data) + 1 // mark processed EOF with len+1 + } else { + c := d.data[d.off] + d.off++ + newOp = d.scan.step(&d.scan, c) + } + if newOp != op { + break + } + } + return newOp +} + +// value decodes a JSON value from d.data[d.off:] into the value. +// it updates d.off to point past the decoded value. +func (d *decodeState) value(v reflect.Value) { + if !v.IsValid() { + _, rest, err := nextValue(d.data[d.off:], &d.nextscan) + if err != nil { + d.error(err) + } + d.off = len(d.data) - len(rest) + + // d.scan thinks we're still at the beginning of the item. + // Feed in an empty string - the shortest, simplest value - + // so that it knows we got to the end of the value. + if d.scan.redo { + // rewind. + d.scan.redo = false + d.scan.step = stateBeginValue + } + d.scan.step(&d.scan, '"') + d.scan.step(&d.scan, '"') + + n := len(d.scan.parseState) + if n > 0 && d.scan.parseState[n-1] == parseObjectKey { + // d.scan thinks we just read an object key; finish the object + d.scan.step(&d.scan, ':') + d.scan.step(&d.scan, '"') + d.scan.step(&d.scan, '"') + d.scan.step(&d.scan, '}') + } + + return + } + + switch op := d.scanWhile(scanSkipSpace); op { + default: + d.error(errPhase) + + case scanBeginArray: + d.array(v) + + case scanBeginObject: + d.object(v) + + case scanBeginLiteral: + d.literal(v) + + case scanBeginName: + d.name(v) + } +} + +type unquotedValue struct{} + +// valueQuoted is like value but decodes a +// quoted string literal or literal null into an interface value. +// If it finds anything other than a quoted string literal or null, +// valueQuoted returns unquotedValue{}. +func (d *decodeState) valueQuoted() interface{} { + switch op := d.scanWhile(scanSkipSpace); op { + default: + d.error(errPhase) + + case scanBeginArray: + d.array(reflect.Value{}) + + case scanBeginObject: + d.object(reflect.Value{}) + + case scanBeginName: + switch v := d.nameInterface().(type) { + case nil, string: + return v + } + + case scanBeginLiteral: + switch v := d.literalInterface().(type) { + case nil, string: + return v + } + } + return unquotedValue{} +} + +// indirect walks down v allocating pointers as needed, +// until it gets to a non-pointer. +// if it encounters an Unmarshaler, indirect stops and returns that. +// if decodingNull is true, indirect stops at the last pointer so it can be set to nil. +func (d *decodeState) indirect(v reflect.Value, decodingNull bool) (Unmarshaler, encoding.TextUnmarshaler, reflect.Value) { + // If v is a named type and is addressable, + // start with its address, so that if the type has pointer methods, + // we find them. + if v.Kind() != reflect.Ptr && v.Type().Name() != "" && v.CanAddr() { + v = v.Addr() + } + for { + // Load value from interface, but only if the result will be + // usefully addressable. + if v.Kind() == reflect.Interface && !v.IsNil() { + e := v.Elem() + if e.Kind() == reflect.Ptr && !e.IsNil() && (!decodingNull || e.Elem().Kind() == reflect.Ptr) { + v = e + continue + } + } + + if v.Kind() != reflect.Ptr { + break + } + + if v.Elem().Kind() != reflect.Ptr && decodingNull && v.CanSet() { + break + } + if v.IsNil() { + v.Set(reflect.New(v.Type().Elem())) + } + if v.Type().NumMethod() > 0 { + if u, ok := v.Interface().(Unmarshaler); ok { + return u, nil, v + } + if u, ok := v.Interface().(encoding.TextUnmarshaler); ok { + return nil, u, v + } + } + v = v.Elem() + } + return nil, nil, v +} + +// array consumes an array from d.data[d.off-1:], decoding into the value v. +// the first byte of the array ('[') has been read already. +func (d *decodeState) array(v reflect.Value) { + // Check for unmarshaler. + u, ut, pv := d.indirect(v, false) + if u != nil { + d.off-- + err := u.UnmarshalJSON(d.next()) + if err != nil { + d.error(err) + } + return + } + if ut != nil { + d.saveError(&UnmarshalTypeError{"array", v.Type(), int64(d.off)}) + d.off-- + d.next() + return + } + + v = pv + + // Check type of target. + switch v.Kind() { + case reflect.Interface: + if v.NumMethod() == 0 { + // Decoding into nil interface? Switch to non-reflect code. + v.Set(reflect.ValueOf(d.arrayInterface())) + return + } + // Otherwise it's invalid. + fallthrough + default: + d.saveError(&UnmarshalTypeError{"array", v.Type(), int64(d.off)}) + d.off-- + d.next() + return + case reflect.Array: + case reflect.Slice: + break + } + + i := 0 + for { + // Look ahead for ] - can only happen on first iteration. + op := d.scanWhile(scanSkipSpace) + if op == scanEndArray { + break + } + + // Back up so d.value can have the byte we just read. + d.off-- + d.scan.undo(op) + + // Get element of array, growing if necessary. + if v.Kind() == reflect.Slice { + // Grow slice if necessary + if i >= v.Cap() { + newcap := v.Cap() + v.Cap()/2 + if newcap < 4 { + newcap = 4 + } + newv := reflect.MakeSlice(v.Type(), v.Len(), newcap) + reflect.Copy(newv, v) + v.Set(newv) + } + if i >= v.Len() { + v.SetLen(i + 1) + } + } + + if i < v.Len() { + // Decode into element. + d.value(v.Index(i)) + } else { + // Ran out of fixed array: skip. + d.value(reflect.Value{}) + } + i++ + + // Next token must be , or ]. + op = d.scanWhile(scanSkipSpace) + 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 +} diff --git a/vendor/gopkg.in/mgo.v2/internal/json/encode.go b/vendor/gopkg.in/mgo.v2/internal/json/encode.go new file mode 100644 index 0000000..67a0f00 --- /dev/null +++ b/vendor/gopkg.in/mgo.v2/internal/json/encode.go @@ -0,0 +1,1256 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package json implements encoding and decoding of JSON as defined in +// RFC 4627. The mapping between JSON and Go values is described +// in the documentation for the Marshal and Unmarshal functions. +// +// See "JSON and Go" for an introduction to this package: +// https://golang.org/doc/articles/json_and_go.html +package json + +import ( + "bytes" + "encoding" + "encoding/base64" + "fmt" + "math" + "reflect" + "runtime" + "sort" + "strconv" + "strings" + "sync" + "unicode" + "unicode/utf8" +) + +// Marshal returns the JSON encoding of v. +// +// Marshal traverses the value v recursively. +// If an encountered value implements the Marshaler interface +// and is not a nil pointer, Marshal calls its MarshalJSON method +// to produce JSON. If no MarshalJSON method is present but the +// value implements encoding.TextMarshaler instead, Marshal calls +// its MarshalText method. +// The nil pointer exception is not strictly necessary +// but mimics a similar, necessary exception in the behavior of +// UnmarshalJSON. +// +// Otherwise, Marshal uses the following type-dependent default encodings: +// +// Boolean values encode as JSON booleans. +// +// Floating point, integer, and Number values encode as JSON numbers. +// +// String values encode as JSON strings coerced to valid UTF-8, +// replacing invalid bytes with the Unicode replacement rune. +// The angle brackets "<" and ">" are escaped to "\u003c" and "\u003e" +// to keep some browsers from misinterpreting JSON output as HTML. +// Ampersand "&" is also escaped to "\u0026" for the same reason. +// This escaping can be disabled using an Encoder with DisableHTMLEscaping. +// +// Array and slice values encode as JSON arrays, except that +// []byte encodes as a base64-encoded string, and a nil slice +// encodes as the null JSON value. +// +// Struct values encode as JSON objects. Each exported struct field +// becomes a member of the object unless +// - the field's tag is "-", or +// - the field is empty and its tag specifies the "omitempty" option. +// The empty values are false, 0, any +// nil pointer or interface value, and any array, slice, map, or string of +// length zero. The object's default key string is the struct field name +// but can be specified in the struct field's tag value. The "json" key in +// the struct field's tag value is the key name, followed by an optional comma +// and options. Examples: +// +// // Field is ignored by this package. +// Field int `json:"-"` +// +// // Field appears in JSON as key "myName". +// Field int `json:"myName"` +// +// // Field appears in JSON as key "myName" and +// // the field is omitted from the object if its value is empty, +// // as defined above. +// Field int `json:"myName,omitempty"` +// +// // Field appears in JSON as key "Field" (the default), but +// // the field is skipped if empty. +// // Note the leading comma. +// Field int `json:",omitempty"` +// +// The "string" option signals that a field is stored as JSON inside a +// JSON-encoded string. It applies only to fields of string, floating point, +// integer, or boolean types. This extra level of encoding is sometimes used +// when communicating with JavaScript programs: +// +// Int64String int64 `json:",string"` +// +// The key name will be used if it's a non-empty string consisting of +// only Unicode letters, digits, dollar signs, percent signs, hyphens, +// underscores and slashes. +// +// Anonymous struct fields are usually marshaled as if their inner exported fields +// were fields in the outer struct, subject to the usual Go visibility rules amended +// as described in the next paragraph. +// An anonymous struct field with a name given in its JSON tag is treated as +// having that name, rather than being anonymous. +// An anonymous struct field of interface type is treated the same as having +// that type as its name, rather than being anonymous. +// +// The Go visibility rules for struct fields are amended for JSON when +// deciding which field to marshal or unmarshal. If there are +// multiple fields at the same level, and that level is the least +// nested (and would therefore be the nesting level selected by the +// usual Go rules), the following extra rules apply: +// +// 1) Of those fields, if any are JSON-tagged, only tagged fields are considered, +// even if there are multiple untagged fields that would otherwise conflict. +// 2) If there is exactly one field (tagged or not according to the first rule), that is selected. +// 3) Otherwise there are multiple fields, and all are ignored; no error occurs. +// +// Handling of anonymous struct fields is new in Go 1.1. +// Prior to Go 1.1, anonymous struct fields were ignored. To force ignoring of +// an anonymous struct field in both current and earlier versions, give the field +// a JSON tag of "-". +// +// Map values encode as JSON objects. The map's key type must either be a string +// or implement encoding.TextMarshaler. The map keys are used as JSON object +// keys, subject to the UTF-8 coercion described for string values above. +// +// Pointer values encode as the value pointed to. +// A nil pointer encodes as the null JSON value. +// +// Interface values encode as the value contained in the interface. +// A nil interface value encodes as the null JSON value. +// +// Channel, complex, and function values cannot be encoded in JSON. +// Attempting to encode such a value causes Marshal to return +// an UnsupportedTypeError. +// +// JSON cannot represent cyclic data structures and Marshal does not +// handle them. Passing cyclic structures to Marshal will result in +// an infinite recursion. +// +func Marshal(v interface{}) ([]byte, error) { + e := &encodeState{} + err := e.marshal(v, encOpts{escapeHTML: true}) + if err != nil { + return nil, err + } + return e.Bytes(), nil +} + +// MarshalIndent is like Marshal but applies Indent to format the output. +func MarshalIndent(v interface{}, prefix, indent string) ([]byte, error) { + b, err := Marshal(v) + if err != nil { + return nil, err + } + var buf bytes.Buffer + err = Indent(&buf, b, prefix, indent) + if err != nil { + return nil, err + } + return buf.Bytes(), nil +} + +// HTMLEscape appends to dst the JSON-encoded src with <, >, &, U+2028 and U+2029 +// characters inside string literals changed to \u003c, \u003e, \u0026, \u2028, \u2029 +// so that the JSON will be safe to embed inside HTML