diff options
Diffstat (limited to 'vendor/github.com/yaegashi/msgraph.go/jsonx')
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/README.md | 55 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/decode.go | 1376 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/encode.go | 1317 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/fold.go | 143 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/indent.go | 141 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/scanner.go | 573 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/stream.go | 507 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/tables.go | 218 | ||||
| -rw-r--r-- | vendor/github.com/yaegashi/msgraph.go/jsonx/tags.go | 44 |
9 files changed, 4374 insertions, 0 deletions
diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/README.md b/vendor/github.com/yaegashi/msgraph.go/jsonx/README.md new file mode 100644 index 00000000..575ce781 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/README.md @@ -0,0 +1,55 @@ +# jsonx + +It's modified version of [encoding/json](https://golang.org/pkg/encoding/json/) +which enables extra map field (with `jsonx:"true"` tag) to catch all other fields not declared in the struct. + +`jsonx` is a code name for internal use +and not related to [JSONx](https://tools.ietf.org/html/draft-rsalz-jsonx-00). + +Example ([Run on playgroud](https://play.golang.org/p/TZi0JeHYG69)) +```go +package main + +import ( + "encoding/json" + "fmt" + + "github.com/yaegashi/msgraph.go/jsonx" +) + +type Extra struct { + X string + Y int + Extra map[string]interface{} `json:"-" jsonx:"true"` +} + +func main() { + var x1, x2 Extra + b := []byte(`{"X":"123","Y":123,"A":"123","B":123}`) + fmt.Printf("\nUnmarshal input: %s\n", string(b)) + json.Unmarshal(b, &x1) + fmt.Printf(" json.Unmarshal: %#v\n", x1) + jsonx.Unmarshal(b, &x2) + fmt.Printf("jsonx.Unmarshal: %#v\n", x2) + + x := Extra{X: "456", Y: 456, Extra: map[string]interface{}{"A": "456", "B": 456}} + fmt.Printf("\nMarshal input: %#v\n", x) + b1, _ := json.Marshal(x) + fmt.Printf(" json.Marshal: %s\n", string(b1)) + b2, _ := jsonx.Marshal(x) + fmt.Printf("jsonx.Marshal: %s\n", string(b2)) +} +``` + +Result + +```text +Unmarshal input: {"X":"123","Y":123,"A":"123","B":123} + json.Unmarshal: main.Extra{X:"123", Y:123, Extra:map[string]interface {}(nil)} +jsonx.Unmarshal: main.Extra{X:"123", Y:123, Extra:map[string]interface {}{"A":"123", "B":123}} + +Marshal input: main.Extra{X:"456", Y:456, Extra:map[string]interface {}{"A":"456", "B":456}} + json.Marshal: {"X":"456","Y":456} +jsonx.Marshal: {"X":"456","Y":456,"A":"456","B":456} +``` + diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/decode.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/decode.go new file mode 100644 index 00000000..081d7ad0 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/decode.go @@ -0,0 +1,1376 @@ +// 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 jsonx + +import ( + "encoding" + "encoding/base64" + "fmt" + "reflect" + "strconv" + "strings" + "unicode" + "unicode/utf16" + "unicode/utf8" +) + +// Unmarshal parses the JSON-encoded data and stores the result +// in the value pointed to by v. If v is nil or not a pointer, +// Unmarshal returns an InvalidUnmarshalError. +// +// 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 value implementing the Unmarshaler interface, +// Unmarshal calls that value's UnmarshalJSON method, including +// when the input is a JSON null. +// Otherwise, if the value implements encoding.TextUnmarshaler +// and the input is a JSON quoted string, Unmarshal calls that value's +// UnmarshalText method with the unquoted form of the string. +// +// 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. By +// default, object keys which don't have a corresponding struct field are +// ignored (see Decoder.DisallowUnknownFields for an alternative). +// +// 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, an integer, 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. In any +// case, it's not guaranteed that all the remaining fields following +// the problematic one will be unmarshaled into the target object. +// +// 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. +// +// By convention, to approximate the behavior of Unmarshal itself, +// Unmarshalers implement UnmarshalJSON([]byte("null")) as a no-op. +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 + Struct string // name of the struct type containing the field + Field string // the full path from root node to the field +} + +func (e *UnmarshalTypeError) Error() string { + if e.Struct != "" || e.Field != "" { + return "json: cannot unmarshal " + e.Value + " into Go struct field " + e.Struct + "." + e.Field + " of type " + e.Type.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. +// +// Deprecated: 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{}) error { + rv := reflect.ValueOf(v) + if rv.Kind() != reflect.Ptr || rv.IsNil() { + return &InvalidUnmarshalError{reflect.TypeOf(v)} + } + + d.scan.reset() + d.scanWhile(scanSkipSpace) + // We decode rv not rv.Elem because the Unmarshaler interface + // test must be applied at the top level of the value. + err := d.value(rv) + if err != nil { + return d.addErrorContext(err) + } + 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 https://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 // next read offset in data + opcode int // last read result + scan scanner + errorContext struct { // provides context for type errors + Struct reflect.Type + FieldStack []string + } + savedError error + useNumber bool + disallowUnknownFields bool +} + +// readIndex returns the position of the last byte read. +func (d *decodeState) readIndex() int { + return d.off - 1 +} + +// phasePanicMsg is used as a panic message when we end up with something that +// shouldn't happen. It can indicate a bug in the JSON decoder, or that +// something is editing the data slice while the decoder executes. +const phasePanicMsg = "JSON decoder out of sync - data changing underfoot?" + +func (d *decodeState) init(data []byte) *decodeState { + d.data = data + d.off = 0 + d.savedError = nil + d.errorContext.Struct = nil + + // Reuse the allocated space for the FieldStack slice. + d.errorContext.FieldStack = d.errorContext.FieldStack[:0] + return d +} + +// 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 = d.addErrorContext(err) + } +} + +// addErrorContext returns a new error enhanced with information from d.errorContext +func (d *decodeState) addErrorContext(err error) error { + if d.errorContext.Struct != nil || len(d.errorContext.FieldStack) > 0 { + switch err := err.(type) { + case *UnmarshalTypeError: + err.Struct = d.errorContext.Struct.Name() + err.Field = strings.Join(d.errorContext.FieldStack, ".") + return err + } + } + return err +} + +// skip scans to the end of what was started. +func (d *decodeState) skip() { + s, data, i := &d.scan, d.data, d.off + depth := len(s.parseState) + for { + op := s.step(s, data[i]) + i++ + if len(s.parseState) < depth { + d.off = i + d.opcode = op + return + } + } +} + +// scanNext processes the byte at d.data[d.off]. +func (d *decodeState) scanNext() { + if d.off < len(d.data) { + d.opcode = d.scan.step(&d.scan, d.data[d.off]) + d.off++ + } else { + d.opcode = d.scan.eof() + d.off = len(d.data) + 1 // mark processed EOF with len+1 + } +} + +// scanWhile processes bytes in d.data[d.off:] until it +// receives a scan code not equal to op. +func (d *decodeState) scanWhile(op int) { + s, data, i := &d.scan, d.data, d.off + for i < len(data) { + newOp := s.step(s, data[i]) + i++ + if newOp != op { + d.opcode = newOp + d.off = i + return + } + } + + d.off = len(data) + 1 // mark processed EOF with len+1 + d.opcode = d.scan.eof() +} + +// rescanLiteral is similar to scanWhile(scanContinue), but it specialises the +// common case where we're decoding a literal. The decoder scans the input +// twice, once for syntax errors and to check the length of the value, and the +// second to perform the decoding. +// +// Only in the second step do we use decodeState to tokenize literals, so we +// know there aren't any syntax errors. We can take advantage of that knowledge, +// and scan a literal's bytes much more quickly. +func (d *decodeState) rescanLiteral() { + data, i := d.data, d.off +Switch: + switch data[i-1] { + case '"': // string + for ; i < len(data); i++ { + switch data[i] { + case '\\': + i++ // escaped char + case '"': + i++ // tokenize the closing quote too + break Switch + } + } + case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-': // number + for ; i < len(data); i++ { + switch data[i] { + case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', + '.', 'e', 'E', '+', '-': + default: + break Switch + } + } + case 't': // true + i += len("rue") + case 'f': // false + i += len("alse") + case 'n': // null + i += len("ull") + } + if i < len(data) { + d.opcode = stateEndValue(&d.scan, data[i]) + } else { + d.opcode = scanEnd + } + d.off = i + 1 +} + +// value consumes a JSON value from d.data[d.off-1:], decoding into v, and +// reads the following byte ahead. If v is invalid, the value is discarded. +// The first byte of the value has been read already. +func (d *decodeState) value(v reflect.Value) error { + switch d.opcode { + default: + panic(phasePanicMsg) + + case scanBeginArray: + if v.IsValid() { + if err := d.array(v); err != nil { + return err + } + } else { + d.skip() + } + d.scanNext() + + case scanBeginObject: + if v.IsValid() { + if err := d.object(v); err != nil { + return err + } + } else { + d.skip() + } + d.scanNext() + + case scanBeginLiteral: + // All bytes inside literal return scanContinue op code. + start := d.readIndex() + d.rescanLiteral() + + if v.IsValid() { + if err := d.literalStore(d.data[start:d.readIndex()], v, false); err != nil { + return err + } + } + } + return nil +} + +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 d.opcode { + default: + panic(phasePanicMsg) + + case scanBeginArray, scanBeginObject: + d.skip() + d.scanNext() + + case scanBeginLiteral: + v := d.literalInterface() + switch v.(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 indirect(v reflect.Value, decodingNull bool) (Unmarshaler, encoding.TextUnmarshaler, reflect.Value) { + // Issue #24153 indicates that it is generally not a guaranteed property + // that you may round-trip a reflect.Value by calling Value.Addr().Elem() + // and expect the value to still be settable for values derived from + // unexported embedded struct fields. + // + // The logic below effectively does this when it first addresses the value + // (to satisfy possible pointer methods) and continues to dereference + // subsequent pointers as necessary. + // + // After the first round-trip, we set v back to the original value to + // preserve the original RW flags contained in reflect.Value. + v0 := v + haveAddr := false + + // 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() { + haveAddr = true + 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) { + haveAddr = false + v = e + continue + } + } + + if v.Kind() != reflect.Ptr { + break + } + + if v.Elem().Kind() != reflect.Ptr && decodingNull && v.CanSet() { + break + } + + // Prevent infinite loop if v is an interface pointing to its own address: + // var v interface{} + // v = &v + if v.Elem().Kind() == reflect.Interface && v.Elem().Elem() == v { + v = v.Elem() + break + } + if v.IsNil() { + v.Set(reflect.New(v.Type().Elem())) + } + if v.Type().NumMethod() > 0 && v.CanInterface() { + if u, ok := v.Interface().(Unmarshaler); ok { + return u, nil, reflect.Value{} + } + if !decodingNull { + if u, ok := v.Interface().(encoding.TextUnmarshaler); ok { + return nil, u, reflect.Value{} + } + } + } + + if haveAddr { + v = v0 // restore original value after round-trip Value.Addr().Elem() + haveAddr = false + } else { + v = v.Elem() + } + } + return nil, nil, v +} + +// array consumes an array from d.data[d.off-1:], decoding into v. +// The first byte of the array ('[') has been read already. +func (d *decodeState) array(v reflect.Value) error { + // Check for unmarshaler. + u, ut, pv := indirect(v, false) + if u != nil { + start := d.readIndex() + d.skip() + return u.UnmarshalJSON(d.data[start:d.off]) + } + if ut != nil { + d.saveError(&UnmarshalTypeError{Value: "array", Type: v.Type(), Offset: int64(d.off)}) + d.skip() + return nil + } + 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. + ai := d.arrayInterface() + v.Set(reflect.ValueOf(ai)) + return nil + } + // Otherwise it's invalid. + fallthrough + default: + d.saveError(&UnmarshalTypeError{Value: "array", Type: v.Type(), Offset: int64(d.off)}) + d.skip() + return nil + case reflect.Array, reflect.Slice: + break + } + + i := 0 + for { + // Look ahead for ] - can only happen on first iteration. + d.scanWhile(scanSkipSpace) + if d.opcode == scanEndArray { + break + } + + // 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. + if err := d.value(v.Index(i)); err != nil { + return err + } + } else { + // Ran out of fixed array: skip. + if err := d.value(reflect.Value{}); err != nil { + return err + } + } + i++ + + // Next token must be , or ]. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + if d.opcode == scanEndArray { + break + } + if d.opcode != scanArrayValue { + panic(phasePanicMsg) + } + } + + 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)) + } + return nil +} + +var nullLiteral = []byte("null") +var textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem() + +// object consumes an object from d.data[d.off-1:], decoding into v. +// The first byte ('{') of the object has been read already. +func (d *decodeState) object(v reflect.Value) error { + // Check for unmarshaler. + u, ut, pv := indirect(v, false) + if u != nil { + start := d.readIndex() + d.skip() + return u.UnmarshalJSON(d.data[start:d.off]) + } + if ut != nil { + d.saveError(&UnmarshalTypeError{Value: "object", Type: v.Type(), Offset: int64(d.off)}) + d.skip() + return nil + } + v = pv + t := v.Type() + + // Decoding into nil interface? Switch to non-reflect code. + if v.Kind() == reflect.Interface && v.NumMethod() == 0 { + oi := d.objectInterface() + v.Set(reflect.ValueOf(oi)) + return nil + } + + var fields structFields + + // Check type of target: + // struct or + // map[T1]T2 where T1 is string, an integer type, + // or an encoding.TextUnmarshaler + switch v.Kind() { + case reflect.Map: + // Map key must either have string kind, have an integer kind, + // or be an encoding.TextUnmarshaler. + switch t.Key().Kind() { + case reflect.String, + reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, + reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + default: + if !reflect.PtrTo(t.Key()).Implements(textUnmarshalerType) { + d.saveError(&UnmarshalTypeError{Value: "object", Type: t, Offset: int64(d.off)}) + d.skip() + return nil + } + } + if v.IsNil() { + v.Set(reflect.MakeMap(t)) + } + case reflect.Struct: + fields = cachedTypeFields(t) + // ok + default: + d.saveError(&UnmarshalTypeError{Value: "object", Type: t, Offset: int64(d.off)}) + d.skip() + return nil + } + + var mapElem, extraMapElem reflect.Value + origErrorContext := d.errorContext + + for { + // Read opening " of string key or closing }. + d.scanWhile(scanSkipSpace) + if d.opcode == scanEndObject { + // closing } - can only happen on first iteration. + break + } + if d.opcode != scanBeginLiteral { + panic(phasePanicMsg) + } + + // Read key. + start := d.readIndex() + d.rescanLiteral() + item := d.data[start:d.readIndex()] + key, ok := unquoteBytes(item) + if !ok { + panic(phasePanicMsg) + } + + // Figure out field corresponding to key. + var subv, mapv reflect.Value + destring := false // whether the value is wrapped in a string to be decoded first + + if v.Kind() == reflect.Map { + elemType := t.Elem() + if !mapElem.IsValid() { + mapElem = reflect.New(elemType).Elem() + } else { + mapElem.Set(reflect.Zero(elemType)) + } + subv = mapElem + mapv = v + } else { + var f, extraf *field + if i, ok := fields.nameIndex[string(key)]; ok { + // Found an exact name match. + f = &fields.list[i] + } else { + // Fall back to the expensive case-insensitive + // linear search. + for i := range fields.list { + ff := &fields.list[i] + if ff.equalFold(ff.nameBytes, key) { + f = ff + break + } + if ff.extra && extraf == nil { + extraf = ff + } + } + } + if f == nil { + f = extraf + } + if f != nil { + subv = v + destring = f.quoted + for _, i := range f.index { + if subv.Kind() == reflect.Ptr { + if subv.IsNil() { + // If a struct embeds a pointer to an unexported type, + // it is not possible to set a newly allocated value + // since the field is unexported. + // + // See https://golang.org/issue/21357 + if !subv.CanSet() { + d.saveError(fmt.Errorf("json: cannot set embedded pointer to unexported struct: %v", subv.Type().Elem())) + // Invalidate subv to ensure d.value(subv) skips over + // the JSON value without assigning it to subv. + subv = reflect.Value{} + destring = false + break + } + subv.Set(reflect.New(subv.Type().Elem())) + } + subv = subv.Elem() + } + subv = subv.Field(i) + } + if f == extraf { + // subv is extra map + mapv = subv + if mapv.IsNil() { + mapv.Set(reflect.MakeMap(mapv.Type())) + } + elemType := mapv.Type().Elem() + if !extraMapElem.IsValid() { + extraMapElem = reflect.New(elemType).Elem() + } else { + extraMapElem.Set(reflect.Zero(elemType)) + } + subv = extraMapElem + } + d.errorContext.FieldStack = append(d.errorContext.FieldStack, f.name) + d.errorContext.Struct = t + } else if d.disallowUnknownFields { + d.saveError(fmt.Errorf("json: unknown field %q", key)) + } + } + + // Read : before value. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + if d.opcode != scanObjectKey { + panic(phasePanicMsg) + } + d.scanWhile(scanSkipSpace) + + if destring { + switch qv := d.valueQuoted().(type) { + case nil: + if err := d.literalStore(nullLiteral, subv, false); err != nil { + return err + } + case string: + if err := d.literalStore([]byte(qv), subv, true); err != nil { + return err + } + default: + d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal unquoted value into %v", subv.Type())) + } + } else { + if err := d.value(subv); err != nil { + return err + } + } + + // Write value back to map; + // if using struct, subv points into struct already. + if mapv.IsValid() { + kt := mapv.Type().Key() + var kv reflect.Value + switch { + case kt.Kind() == reflect.String: + kv = reflect.ValueOf(key).Convert(kt) + case reflect.PtrTo(kt).Implements(textUnmarshalerType): + kv = reflect.New(kt) + if err := d.literalStore(item, kv, true); err != nil { + return err + } + kv = kv.Elem() + default: + switch kt.Kind() { + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: + s := string(key) + n, err := strconv.ParseInt(s, 10, 64) + if err != nil || reflect.Zero(kt).OverflowInt(n) { + d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: kt, Offset: int64(start + 1)}) + break + } + kv = reflect.ValueOf(n).Convert(kt) + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + s := string(key) + n, err := strconv.ParseUint(s, 10, 64) + if err != nil || reflect.Zero(kt).OverflowUint(n) { + d.saveError(&UnmarshalTypeError{Value: "number " + s, Type: kt, Offset: int64(start + 1)}) + break + } + kv = reflect.ValueOf(n).Convert(kt) + default: + panic("json: Unexpected key type") // should never occur + } + } + if kv.IsValid() { + mapv.SetMapIndex(kv, subv) + } + } + + // Next token must be , or }. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + // Reset errorContext to its original state. + // Keep the same underlying array for FieldStack, to reuse the + // space and avoid unnecessary allocs. + d.errorContext.FieldStack = d.errorContext.FieldStack[:len(origErrorContext.FieldStack)] + d.errorContext.Struct = origErrorContext.Struct + if d.opcode == scanEndObject { + break + } + if d.opcode != scanObjectValue { + panic(phasePanicMsg) + } + } + return nil +} + +// 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{Value: "number " + s, Type: reflect.TypeOf(0.0), Offset: 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) error { + // 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 nil + } + isNull := item[0] == 'n' // null + u, ut, pv := indirect(v, isNull) + if u != nil { + return u.UnmarshalJSON(item) + } + 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())) + return nil + } + val := "number" + switch item[0] { + case 'n': + val = "null" + case 't', 'f': + val = "bool" + } + d.saveError(&UnmarshalTypeError{Value: val, Type: v.Type(), Offset: int64(d.readIndex())}) + return nil + } + s, ok := unquoteBytes(item) + if !ok { + if fromQuoted { + return fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()) + } + panic(phasePanicMsg) + } + return ut.UnmarshalText(s) + } + + v = pv + + switch c := item[0]; c { + case 'n': // null + // The main parser checks that only true and false can reach here, + // but if this was a quoted string input, it could be anything. + if fromQuoted && string(item) != "null" { + d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type())) + break + } + 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 := item[0] == 't' + // The main parser checks that only true and false can reach here, + // but if this was a quoted string input, it could be anything. + if fromQuoted && string(item) != "true" && string(item) != "false" { + d.saveError(fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type())) + break + } + 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{Value: "bool", Type: v.Type(), Offset: int64(d.readIndex())}) + } + case reflect.Bool: + v.SetBool(value) + case reflect.Interface: + if v.NumMethod() == 0 { + v.Set(reflect.ValueOf(value)) + } else { + d.saveError(&UnmarshalTypeError{Value: "bool", Type: v.Type(), Offset: int64(d.readIndex())}) + } + } + + case '"': // string + s, ok := unquoteBytes(item) + if !ok { + if fromQuoted { + return fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()) + } + panic(phasePanicMsg) + } + switch v.Kind() { + default: + d.saveError(&UnmarshalTypeError{Value: "string", Type: v.Type(), Offset: int64(d.readIndex())}) + case reflect.Slice: + if v.Type().Elem().Kind() != reflect.Uint8 { + d.saveError(&UnmarshalTypeError{Value: "string", Type: v.Type(), Offset: int64(d.readIndex())}) + 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{Value: "string", Type: v.Type(), Offset: int64(d.readIndex())}) + } + } + + default: // number + if c != '-' && (c < '0' || c > '9') { + if fromQuoted { + return fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()) + } + panic(phasePanicMsg) + } + s := string(item) + switch v.Kind() { + default: + if v.Kind() == reflect.String && v.Type() == numberType { + v.SetString(s) + if !isValidNumber(s) { + return fmt.Errorf("json: invalid number literal, trying to unmarshal %q into Number", item) + } + break + } + if fromQuoted { + return fmt.Errorf("json: invalid use of ,string struct tag, trying to unmarshal %q into %v", item, v.Type()) + } + d.saveError(&UnmarshalTypeError{Value: "number", Type: v.Type(), Offset: int64(d.readIndex())}) + case reflect.Interface: + n, err := d.convertNumber(s) + if err != nil { + d.saveError(err) + break + } + if v.NumMethod() != 0 { + d.saveError(&UnmarshalTypeError{Value: "number", Type: v.Type(), Offset: int64(d.readIndex())}) + 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{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())}) + 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{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())}) + 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{Value: "number " + s, Type: v.Type(), Offset: int64(d.readIndex())}) + break + } + v.SetFloat(n) + } + } + return nil +} + +// 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() (val interface{}) { + switch d.opcode { + default: + panic(phasePanicMsg) + case scanBeginArray: + val = d.arrayInterface() + d.scanNext() + case scanBeginObject: + val = d.objectInterface() + d.scanNext() + case scanBeginLiteral: + val = d.literalInterface() + } + return +} + +// 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. + d.scanWhile(scanSkipSpace) + if d.opcode == scanEndArray { + break + } + + v = append(v, d.valueInterface()) + + // Next token must be , or ]. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + if d.opcode == scanEndArray { + break + } + if d.opcode != scanArrayValue { + panic(phasePanicMsg) + } + } + return v +} + +// objectInterface is like object but returns map[string]interface{}. +func (d *decodeState) objectInterface() map[string]interface{} { + m := make(map[string]interface{}) + for { + // Read opening " of string key or closing }. + d.scanWhile(scanSkipSpace) + if d.opcode == scanEndObject { + // closing } - can only happen on first iteration. + break + } + if d.opcode != scanBeginLiteral { + panic(phasePanicMsg) + } + + // Read string key. + start := d.readIndex() + d.rescanLiteral() + item := d.data[start:d.readIndex()] + key, ok := unquote(item) + if !ok { + panic(phasePanicMsg) + } + + // Read : before value. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + if d.opcode != scanObjectKey { + panic(phasePanicMsg) + } + d.scanWhile(scanSkipSpace) + + // Read value. + m[key] = d.valueInterface() + + // Next token must be , or }. + if d.opcode == scanSkipSpace { + d.scanWhile(scanSkipSpace) + } + if d.opcode == scanEndObject { + break + } + if d.opcode != scanObjectValue { + panic(phasePanicMsg) + } + } + return m +} + +// literalInterface consumes and returns a literal from d.data[d.off-1:] and +// it reads the following byte ahead. The first byte of the literal has been +// read already (that's how the caller knows it's a literal). +func (d *decodeState) literalInterface() interface{} { + // All bytes inside literal return scanContinue op code. + start := d.readIndex() + d.rescanLiteral() + + item := d.data[start:d.readIndex()] + + 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 { + panic(phasePanicMsg) + } + return s + + default: // number + if c != '-' && (c < '0' || c > '9') { + panic(phasePanicMsg) + } + n, err := d.convertNumber(string(item)) + if err != nil { + d.saveError(err) + } + return n + } +} + +// 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 + } + var r rune + for _, c := range s[2:6] { + switch { + case '0' <= c && c <= '9': + c = c - '0' + case 'a' <= c && c <= 'f': + c = c - 'a' + 10 + case 'A' <= c && c <= 'F': + c = c - 'A' + 10 + default: + return -1 + } + r = r*16 + rune(c) + } + return 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/github.com/yaegashi/msgraph.go/jsonx/encode.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/encode.go new file mode 100644 index 00000000..7c155502 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/encode.go @@ -0,0 +1,1317 @@ +// 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 7159. 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 jsonx + +import ( + "bytes" + "encoding" + "encoding/base64" + "fmt" + "math" + "reflect" + "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 and encodes the result as a JSON string. +// 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. +// So that the JSON will be safe to embed inside HTML <script> tags, +// the string is encoded using HTMLEscape, +// which replaces "<", ">", "&", U+2028, and U+2029 are escaped +// to "\u003c","\u003e", "\u0026", "\u2028", and "\u2029". +// This replacement can be disabled when using an Encoder, +// by calling SetEscapeHTML(false). +// +// 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, using the +// field name as the object key, unless the field is omitted for one of the +// reasons given below. +// +// The encoding of each struct field can be customized by the format string +// stored under the "json" key in the struct field's tag. +// The format string gives the name of the field, possibly followed by a +// comma-separated list of options. The name may be empty in order to +// specify options without overriding the default field name. +// +// The "omitempty" option specifies that the field should be omitted +// from the encoding if the field has an empty value, defined as +// false, 0, a nil pointer, a nil interface value, and any empty array, +// slice, map, or string. +// +// As a special case, if the field tag is "-", the field is always omitted. +// Note that a field with name "-" can still be generated using the tag "-,". +// +// Examples of struct field tags and their meanings: +// +// // 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"` +// +// // Field is ignored by this package. +// Field int `json:"-"` +// +// // Field appears in JSON as key "-". +// Field int `json:"-,"` +// +// 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, and ASCII punctuation except quotation +// marks, backslash, and comma. +// +// 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, an integer type, or implement encoding.TextMarshaler. The map keys +// are sorted and used as JSON object keys by applying the following rules, +// subject to the UTF-8 coercion described for string values above: +// - keys of any string type are used directly +// - encoding.TextMarshalers are marshaled +// - integer keys are converted to strings +// +// 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 := newEncodeState() + + err := e.marshal(v, encOpts{escapeHTML: true}) + if err != nil { + return nil, err + } + buf := append([]byte(nil), e.Bytes()...) + + e.Reset() + encodeStatePool.Put(e) + + return buf, nil +} + +// MarshalIndent is like Marshal but applies Indent to format the output. +// Each JSON element in the output will begin on a new line beginning with prefix +// followed by one or more copies of indent according to the indentation nesting. +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 <script> tags. +// For historical reasons, web browsers don't honor standard HTML +// escaping within <script> tags, so an alternative JSON encoding must +// be used. +func HTMLEscape(dst *bytes.Buffer, src []byte) { + // The characters can only appear in string literals, + // so just scan the string one byte at a time. + start := 0 + for i, c := range src { + if c == '<' || c == '>' || c == '&' { + if start < i { + dst.Write(src[start:i]) + } + dst.WriteString(`\u00`) + dst.WriteByte(hex[c>>4]) + dst.WriteByte(hex[c&0xF]) + start = i + 1 + } + // Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9). + if c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 { + if start < i { + dst.Write(src[start:i]) + } + dst.WriteString(`\u202`) + dst.WriteByte(hex[src[i+2]&0xF]) + start = i + 3 + } + } + if start < len(src) { + dst.Write(src[start:]) + } +} + +// Marshaler is the interface implemented by types that +// can marshal themselves into valid JSON. +type Marshaler interface { + MarshalJSON() ([]byte, error) +} + +// An UnsupportedTypeError is returned by Marshal when attempting +// to encode an unsupported value type. +type UnsupportedTypeError struct { + Type reflect.Type +} + +func (e *UnsupportedTypeError) Error() string { + return "json: unsupported type: " + e.Type.String() +} + +type UnsupportedValueError struct { + Value reflect.Value + Str string +} + +func (e *UnsupportedValueError) Error() string { + return "json: unsupported value: " + e.Str +} + +// Before Go 1.2, an InvalidUTF8Error was returned by Marshal when +// attempting to encode a string value with invalid UTF-8 sequences. +// As of Go 1.2, Marshal instead coerces the string to valid UTF-8 by +// replacing invalid bytes with the Unicode replacement rune U+FFFD. +// +// Deprecated: No longer used; kept for compatibility. +type InvalidUTF8Error struct { + S string // the whole string value that caused the error +} + +func (e *InvalidUTF8Error) Error() string { + return "json: invalid UTF-8 in string: " + strconv.Quote(e.S) +} + +// A MarshalerError represents an error from calling a MarshalJSON or MarshalText method. +type MarshalerError struct { + Type reflect.Type + Err error +} + +func (e *MarshalerError) Error() string { + return "json: error calling MarshalJSON for type " + e.Type.String() + ": " + e.Err.Error() +} + +func (e *MarshalerError) Unwrap() error { return e.Err } + +var hex = "0123456789abcdef" + +// An encodeState encodes JSON into a bytes.Buffer. +type encodeState struct { + bytes.Buffer // accumulated output + scratch [64]byte +} + +var encodeStatePool sync.Pool + +func newEncodeState() *encodeState { + if v := encodeStatePool.Get(); v != nil { + e := v.(*encodeState) + e.Reset() + return e + } + return new(encodeState) +} + +// jsonError is an error wrapper type for internal use only. +// Panics with errors are wrapped in jsonError so that the top-level recover +// can distinguish intentional panics from this package. +type jsonError struct{ error } + +func (e *encodeState) marshal(v interface{}, opts encOpts) (err error) { + defer func() { + if r := recover(); r != nil { + if je, ok := r.(jsonError); ok { + err = je.error + } else { + panic(r) + } + } + }() + e.reflectValue(reflect.ValueOf(v), opts) + return nil +} + +// error aborts the encoding by panicking with err wrapped in jsonError. +func (e *encodeState) error(err error) { + panic(jsonError{err}) +} + +func isEmptyValue(v reflect.Value) bool { + switch v.Kind() { + case reflect.Array, reflect.Map, reflect.Slice, reflect.String: + return v.Len() == 0 + case reflect.Bool: + return !v.Bool() + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: + return v.Int() == 0 + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + return v.Uint() == 0 + case reflect.Float32, reflect.Float64: + return v.Float() == 0 + case reflect.Interface, reflect.Ptr: + return v.IsNil() + } + return false +} + +func (e *encodeState) reflectValue(v reflect.Value, opts encOpts) { + valueEncoder(v)(e, v, opts) +} + +type encOpts struct { + // quoted causes primitive fields to be encoded inside JSON strings. + quoted bool + // escapeHTML causes '<', '>', and '&' to be escaped in JSON strings. + escapeHTML bool +} + +type encoderFunc func(e *encodeState, v reflect.Value, opts encOpts) + +var encoderCache sync.Map // map[reflect.Type]encoderFunc + +func valueEncoder(v reflect.Value) encoderFunc { + if !v.IsValid() { + return invalidValueEncoder + } + return typeEncoder(v.Type()) +} + +func typeEncoder(t reflect.Type) encoderFunc { + if fi, ok := encoderCache.Load(t); ok { + return fi.(encoderFunc) + } + + // To deal with recursive types, populate the map with an + // indirect func before we build it. This type waits on the + // real func (f) to be ready and then calls it. This indirect + // func is only used for recursive types. + var ( + wg sync.WaitGroup + f encoderFunc + ) + wg.Add(1) + fi, loaded := encoderCache.LoadOrStore(t, encoderFunc(func(e *encodeState, v reflect.Value, opts encOpts) { + wg.Wait() + f(e, v, opts) + })) + if loaded { + return fi.(encoderFunc) + } + + // Compute the real encoder and replace the indirect func with it. + f = newTypeEncoder(t, true) + wg.Done() + encoderCache.Store(t, f) + return f +} + +var ( + marshalerType = reflect.TypeOf((*Marshaler)(nil)).Elem() + textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem() +) + +// newTypeEncoder constructs an encoderFunc for a type. +// The returned encoder only checks CanAddr when allowAddr is true. +func newTypeEncoder(t reflect.Type, allowAddr bool) encoderFunc { + if t.Implements(marshalerType) { + return marshalerEncoder + } + if t.Kind() != reflect.Ptr && allowAddr && reflect.PtrTo(t).Implements(marshalerType) { + return newCondAddrEncoder(addrMarshalerEncoder, newTypeEncoder(t, false)) + } + + if t.Implements(textMarshalerType) { + return textMarshalerEncoder + } + if t.Kind() != reflect.Ptr && allowAddr && reflect.PtrTo(t).Implements(textMarshalerType) { + return newCondAddrEncoder(addrTextMarshalerEncoder, newTypeEncoder(t, false)) + } + + switch t.Kind() { + case reflect.Bool: + return boolEncoder + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: + return intEncoder + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + return uintEncoder + case reflect.Float32: + return float32Encoder + case reflect.Float64: + return float64Encoder + case reflect.String: + return stringEncoder + case reflect.Interface: + return interfaceEncoder + case reflect.Struct: + return newStructEncoder(t) + case reflect.Map: + return newMapEncoder(t) + case reflect.Slice: + return newSliceEncoder(t) + case reflect.Array: + return newArrayEncoder(t) + case reflect.Ptr: + return newPtrEncoder(t) + default: + return unsupportedTypeEncoder + } +} + +func invalidValueEncoder(e *encodeState, v reflect.Value, _ encOpts) { + e.WriteString("null") +} + +func marshalerEncoder(e *encodeState, v reflect.Value, opts encOpts) { + if v.Kind() == reflect.Ptr && v.IsNil() { + e.WriteString("null") + return + } + m, ok := v.Interface().(Marshaler) + if !ok { + e.WriteString("null") + return + } + b, err := m.MarshalJSON() + if err == nil { + // copy JSON into buffer, checking validity. + err = compact(&e.Buffer, b, opts.escapeHTML) + } + if err != nil { + e.error(&MarshalerError{v.Type(), err}) + } +} + +func addrMarshalerEncoder(e *encodeState, v reflect.Value, opts encOpts) { + va := v.Addr() + if va.IsNil() { + e.WriteString("null") + return + } + m := va.Interface().(Marshaler) + b, err := m.MarshalJSON() + if err == nil { + // copy JSON into buffer, checking validity. + err = compact(&e.Buffer, b, opts.escapeHTML) + } + if err != nil { + e.error(&MarshalerError{v.Type(), err}) + } +} + +func textMarshalerEncoder(e *encodeState, v reflect.Value, opts encOpts) { + if v.Kind() == reflect.Ptr && v.IsNil() { + e.WriteString("null") + return + } + m := v.Interface().(encoding.TextMarshaler) + b, err := m.MarshalText() + if err != nil { + e.error(&MarshalerError{v.Type(), err}) + } + e.stringBytes(b, opts.escapeHTML) +} + +func addrTextMarshalerEncoder(e *encodeState, v reflect.Value, opts encOpts) { + va := v.Addr() + if va.IsNil() { + e.WriteString("null") + return + } + m := va.Interface().(encoding.TextMarshaler) + b, err := m.MarshalText() + if err != nil { + e.error(&MarshalerError{v.Type(), err}) + } + e.stringBytes(b, opts.escapeHTML) +} + +func boolEncoder(e *encodeState, v reflect.Value, opts encOpts) { + if opts.quoted { + e.WriteByte('"') + } + if v.Bool() { + e.WriteString("true") + } else { + e.WriteString("false") + } + if opts.quoted { + e.WriteByte('"') + } +} + +func intEncoder(e *encodeState, v reflect.Value, opts encOpts) { + b := strconv.AppendInt(e.scratch[:0], v.Int(), 10) + if opts.quoted { + e.WriteByte('"') + } + e.Write(b) + if opts.quoted { + e.WriteByte('"') + } +} + +func uintEncoder(e *encodeState, v reflect.Value, opts encOpts) { + b := strconv.AppendUint(e.scratch[:0], v.Uint(), 10) + if opts.quoted { + e.WriteByte('"') + } + e.Write(b) + if opts.quoted { + e.WriteByte('"') + } +} + +type floatEncoder int // number of bits + +func (bits floatEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + f := v.Float() + if math.IsInf(f, 0) || math.IsNaN(f) { + e.error(&UnsupportedValueError{v, strconv.FormatFloat(f, 'g', -1, int(bits))}) + } + + // Convert as if by ES6 number to string conversion. + // This matches most other JSON generators. + // See golang.org/issue/6384 and golang.org/issue/14135. + // Like fmt %g, but the exponent cutoffs are different + // and exponents themselves are not padded to two digits. + b := e.scratch[:0] + abs := math.Abs(f) + fmt := byte('f') + // Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right. + if abs != 0 { + if bits == 64 && (abs < 1e-6 || abs >= 1e21) || bits == 32 && (float32(abs) < 1e-6 || float32(abs) >= 1e21) { + fmt = 'e' + } + } + b = strconv.AppendFloat(b, f, fmt, -1, int(bits)) + if fmt == 'e' { + // clean up e-09 to e-9 + n := len(b) + if n >= 4 && b[n-4] == 'e' && b[n-3] == '-' && b[n-2] == '0' { + b[n-2] = b[n-1] + b = b[:n-1] + } + } + + if opts.quoted { + e.WriteByte('"') + } + e.Write(b) + if opts.quoted { + e.WriteByte('"') + } +} + +var ( + float32Encoder = (floatEncoder(32)).encode + float64Encoder = (floatEncoder(64)).encode +) + +func stringEncoder(e *encodeState, v reflect.Value, opts encOpts) { + if v.Type() == numberType { + numStr := v.String() + // In Go1.5 the empty string encodes to "0", while this is not a valid number literal + // we keep compatibility so check validity after this. + if numStr == "" { + numStr = "0" // Number's zero-val + } + if !isValidNumber(numStr) { + e.error(fmt.Errorf("json: invalid number literal %q", numStr)) + } + e.WriteString(numStr) + return + } + if opts.quoted { + sb, err := Marshal(v.String()) + if err != nil { + e.error(err) + } + e.string(string(sb), opts.escapeHTML) + } else { + e.string(v.String(), opts.escapeHTML) + } +} + +func interfaceEncoder(e *encodeState, v reflect.Value, opts encOpts) { + if v.IsNil() { + e.WriteString("null") + return + } + e.reflectValue(v.Elem(), opts) +} + +func unsupportedTypeEncoder(e *encodeState, v reflect.Value, _ encOpts) { + e.error(&UnsupportedTypeError{v.Type()}) +} + +type structEncoder struct { + fields structFields +} + +type structFields struct { + list []field + nameIndex map[string]int +} + +func (se structEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + next := byte('{') +FieldLoop: + for i := range se.fields.list { + f := &se.fields.list[i] + + // Find the nested struct field by following f.index. + fv := v + for _, i := range f.index { + if fv.Kind() == reflect.Ptr { + if fv.IsNil() { + continue FieldLoop + } + fv = fv.Elem() + } + fv = fv.Field(i) + } + + if f.omitEmpty && isEmptyValue(fv) { + continue + } + if f.extra { + keys := fv.MapKeys() + sv := make([]reflectWithString, len(keys)) + for i, v := range keys { + sv[i].v = v + if err := sv[i].resolve(); err != nil { + e.error(&MarshalerError{v.Type(), err}) + } + } + sort.Slice(sv, func(i, j int) bool { return sv[i].s < sv[j].s }) + elemEnc := typeEncoder(fv.Type().Elem()) + for _, kv := range sv { + e.WriteByte(next) + next = ',' + e.string(kv.s, opts.escapeHTML) + e.WriteByte(':') + elemEnc(e, fv.MapIndex(kv.v), opts) + } + continue + } + e.WriteByte(next) + next = ',' + if opts.escapeHTML { + e.WriteString(f.nameEscHTML) + } else { + e.WriteString(f.nameNonEsc) + } + opts.quoted = f.quoted + f.encoder(e, fv, opts) + } + if next == '{' { + e.WriteString("{}") + } else { + e.WriteByte('}') + } +} + +func newStructEncoder(t reflect.Type) encoderFunc { + se := structEncoder{fields: cachedTypeFields(t)} + return se.encode +} + +type mapEncoder struct { + elemEnc encoderFunc +} + +func (me mapEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + if v.IsNil() { + e.WriteString("null") + return + } + e.WriteByte('{') + + // Extract and sort the keys. + keys := v.MapKeys() + sv := make([]reflectWithString, len(keys)) + for i, v := range keys { + sv[i].v = v + if err := sv[i].resolve(); err != nil { + e.error(&MarshalerError{v.Type(), err}) + } + } + sort.Slice(sv, func(i, j int) bool { return sv[i].s < sv[j].s }) + + for i, kv := range sv { + if i > 0 { + e.WriteByte(',') + } + e.string(kv.s, opts.escapeHTML) + e.WriteByte(':') + me.elemEnc(e, v.MapIndex(kv.v), opts) + } + e.WriteByte('}') +} + +func newMapEncoder(t reflect.Type) encoderFunc { + switch t.Key().Kind() { + case reflect.String, + reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, + reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + default: + if !t.Key().Implements(textMarshalerType) { + return unsupportedTypeEncoder + } + } + me := mapEncoder{typeEncoder(t.Elem())} + return me.encode +} + +func encodeByteSlice(e *encodeState, v reflect.Value, _ encOpts) { + if v.IsNil() { + e.WriteString("null") + return + } + s := v.Bytes() + e.WriteByte('"') + encodedLen := base64.StdEncoding.EncodedLen(len(s)) + if encodedLen <= len(e.scratch) { + // If the encoded bytes fit in e.scratch, avoid an extra + // allocation and use the cheaper Encoding.Encode. + dst := e.scratch[:encodedLen] + base64.StdEncoding.Encode(dst, s) + e.Write(dst) + } else if encodedLen <= 1024 { + // The encoded bytes are short enough to allocate for, and + // Encoding.Encode is still cheaper. + dst := make([]byte, encodedLen) + base64.StdEncoding.Encode(dst, s) + e.Write(dst) + } else { + // The encoded bytes are too long to cheaply allocate, and + // Encoding.Encode is no longer noticeably cheaper. + enc := base64.NewEncoder(base64.StdEncoding, e) + enc.Write(s) + enc.Close() + } + e.WriteByte('"') +} + +// sliceEncoder just wraps an arrayEncoder, checking to make sure the value isn't nil. +type sliceEncoder struct { + arrayEnc encoderFunc +} + +func (se sliceEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + if v.IsNil() { + e.WriteString("null") + return + } + se.arrayEnc(e, v, opts) +} + +func newSliceEncoder(t reflect.Type) encoderFunc { + // Byte slices get special treatment; arrays don't. + if t.Elem().Kind() == reflect.Uint8 { + p := reflect.PtrTo(t.Elem()) + if !p.Implements(marshalerType) && !p.Implements(textMarshalerType) { + return encodeByteSlice + } + } + enc := sliceEncoder{newArrayEncoder(t)} + return enc.encode +} + +type arrayEncoder struct { + elemEnc encoderFunc +} + +func (ae arrayEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + e.WriteByte('[') + n := v.Len() + for i := 0; i < n; i++ { + if i > 0 { + e.WriteByte(',') + } + ae.elemEnc(e, v.Index(i), opts) + } + e.WriteByte(']') +} + +func newArrayEncoder(t reflect.Type) encoderFunc { + enc := arrayEncoder{typeEncoder(t.Elem())} + return enc.encode +} + +type ptrEncoder struct { + elemEnc encoderFunc +} + +func (pe ptrEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + if v.IsNil() { + e.WriteString("null") + return + } + pe.elemEnc(e, v.Elem(), opts) +} + +func newPtrEncoder(t reflect.Type) encoderFunc { + enc := ptrEncoder{typeEncoder(t.Elem())} + return enc.encode +} + +type condAddrEncoder struct { + canAddrEnc, elseEnc encoderFunc +} + +func (ce condAddrEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) { + if v.CanAddr() { + ce.canAddrEnc(e, v, opts) + } else { + ce.elseEnc(e, v, opts) + } +} + +// newCondAddrEncoder returns an encoder that checks whether its value +// CanAddr and delegates to canAddrEnc if so, else to elseEnc. +func newCondAddrEncoder(canAddrEnc, elseEnc encoderFunc) encoderFunc { + enc := condAddrEncoder{canAddrEnc: canAddrEnc, elseEnc: elseEnc} + return enc.encode +} + +func isValidTag(s string) bool { + if s == "" { + return false + } + for _, c := range s { + switch { + case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~ ", c): + // Backslash and quote chars are reserved, but + // otherwise any punctuation chars are allowed + // in a tag name. + case !unicode.IsLetter(c) && !unicode.IsDigit(c): + return false + } + } + return true +} + +func typeByIndex(t reflect.Type, index []int) reflect.Type { + for _, i := range index { + if t.Kind() == reflect.Ptr { + t = t.Elem() + } + t = t.Field(i).Type + } + return t +} + +type reflectWithString struct { + v reflect.Value + s string +} + +func (w *reflectWithString) resolve() error { + if w.v.Kind() == reflect.String { + w.s = w.v.String() + return nil + } + if tm, ok := w.v.Interface().(encoding.TextMarshaler); ok { + buf, err := tm.MarshalText() + w.s = string(buf) + return err + } + switch w.v.Kind() { + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: + w.s = strconv.FormatInt(w.v.Int(), 10) + return nil + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: + w.s = strconv.FormatUint(w.v.Uint(), 10) + return nil + } + panic("unexpected map key type") +} + +// NOTE: keep in sync with stringBytes below. +func (e *encodeState) string(s string, escapeHTML bool) { + e.WriteByte('"') + start := 0 + for i := 0; i < len(s); { + if b := s[i]; b < utf8.RuneSelf { + if htmlSafeSet[b] || (!escapeHTML && safeSet[b]) { + i++ + continue + } + if start < i { + e.WriteString(s[start:i]) + } + e.WriteByte('\\') + switch b { + case '\\', '"': + e.WriteByte(b) + case '\n': + e.WriteByte('n') + case '\r': + e.WriteByte('r') + case '\t': + e.WriteByte('t') + default: + // This encodes bytes < 0x20 except for \t, \n and \r. + // If escapeHTML is set, it also escapes <, >, and & + // because they can lead to security holes when + // user-controlled strings are rendered into JSON + // and served to some browsers. + e.WriteString(`u00`) + e.WriteByte(hex[b>>4]) + e.WriteByte(hex[b&0xF]) + } + i++ + start = i + continue + } + c, size := utf8.DecodeRuneInString(s[i:]) + if c == utf8.RuneError && size == 1 { + if start < i { + e.WriteString(s[start:i]) + } + e.WriteString(`\ufffd`) + i += size + start = i + continue + } + // U+2028 is LINE SEPARATOR. + // U+2029 is PARAGRAPH SEPARATOR. + // They are both technically valid characters in JSON strings, + // but don't work in JSONP, which has to be evaluated as JavaScript, + // and can lead to security holes there. It is valid JSON to + // escape them, so we do so unconditionally. + // See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion. + if c == '\u2028' || c == '\u2029' { + if start < i { + e.WriteString(s[start:i]) + } + e.WriteString(`\u202`) + e.WriteByte(hex[c&0xF]) + i += size + start = i + continue + } + i += size + } + if start < len(s) { + e.WriteString(s[start:]) + } + e.WriteByte('"') +} + +// NOTE: keep in sync with string above. +func (e *encodeState) stringBytes(s []byte, escapeHTML bool) { + e.WriteByte('"') + start := 0 + for i := 0; i < len(s); { + if b := s[i]; b < utf8.RuneSelf { + if htmlSafeSet[b] || (!escapeHTML && safeSet[b]) { + i++ + continue + } + if start < i { + e.Write(s[start:i]) + } + e.WriteByte('\\') + switch b { + case '\\', '"': + e.WriteByte(b) + case '\n': + e.WriteByte('n') + case '\r': + e.WriteByte('r') + case '\t': + e.WriteByte('t') + default: + // This encodes bytes < 0x20 except for \t, \n and \r. + // If escapeHTML is set, it also escapes <, >, and & + // because they can lead to security holes when + // user-controlled strings are rendered into JSON + // and served to some browsers. + e.WriteString(`u00`) + e.WriteByte(hex[b>>4]) + e.WriteByte(hex[b&0xF]) + } + i++ + start = i + continue + } + c, size := utf8.DecodeRune(s[i:]) + if c == utf8.RuneError && size == 1 { + if start < i { + e.Write(s[start:i]) + } + e.WriteString(`\ufffd`) + i += size + start = i + continue + } + // U+2028 is LINE SEPARATOR. + // U+2029 is PARAGRAPH SEPARATOR. + // They are both technically valid characters in JSON strings, + // but don't work in JSONP, which has to be evaluated as JavaScript, + // and can lead to security holes there. It is valid JSON to + // escape them, so we do so unconditionally. + // See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion. + if c == '\u2028' || c == '\u2029' { + if start < i { + e.Write(s[start:i]) + } + e.WriteString(`\u202`) + e.WriteByte(hex[c&0xF]) + i += size + start = i + continue + } + i += size + } + if start < len(s) { + e.Write(s[start:]) + } + e.WriteByte('"') +} + +// A field represents a single field found in a struct. +type field struct { + name string + nameBytes []byte // []byte(name) + equalFold func(s, t []byte) bool // bytes.EqualFold or equivalent + + nameNonEsc string // `"` + name + `":` + nameEscHTML string // `"` + HTMLEscape(name) + `":` + + tag bool + index []int + typ reflect.Type + omitEmpty bool + extra bool + quoted bool + + encoder encoderFunc +} + +// byIndex sorts field by index sequence. +type byIndex []field + +func (x byIndex) Len() int { return len(x) } + +func (x byIndex) Swap(i, j int) { x[i], x[j] = x[j], x[i] } + +func (x byIndex) Less(i, j int) bool { + for k, xik := range x[i].index { + if k >= len(x[j].index) { + return false + } + if xik != x[j].index[k] { + return xik < x[j].index[k] + } + } + return len(x[i].index) < len(x[j].index) +} + +// typeFields returns a list of fields that JSON should recognize for the given type. +// The algorithm is breadth-first search over the set of structs to include - the top struct +// and then any reachable anonymous structs. +func typeFields(t reflect.Type) structFields { + // Anonymous fields to explore at the current level and the next. + current := []field{} + next := []field{{typ: t}} + + // Count of queued names for current level and the next. + var count, nextCount map[reflect.Type]int + + // Types already visited at an earlier level. + visited := map[reflect.Type]bool{} + + // Fields found. + var fields []field + + // Buffer to run HTMLEscape on field names. + var nameEscBuf bytes.Buffer + + for len(next) > 0 { + current, next = next, current[:0] + count, nextCount = nextCount, map[reflect.Type]int{} + + for _, f := range current { + if visited[f.typ] { + continue + } + visited[f.typ] = true + + // Scan f.typ for fields to include. + for i := 0; i < f.typ.NumField(); i++ { + sf := f.typ.Field(i) + isUnexported := sf.PkgPath != "" + if sf.Anonymous { + t := sf.Type + if t.Kind() == reflect.Ptr { + t = t.Elem() + } + if isUnexported && t.Kind() != reflect.Struct { + // Ignore embedded fields of unexported non-struct types. + continue + } + // Do not ignore embedded fields of unexported struct types + // since they may have exported fields. + } else if isUnexported { + // Ignore unexported non-embedded fields. + continue + } + tag := sf.Tag.Get("json") + tagx := sf.Tag.Get("jsonx") + if tag == "-" && tagx == "" { + continue + } + if tagx != "" { + tag = "" + } + name, opts := parseTag(tag) + if !isValidTag(name) { + name = "" + } + index := make([]int, len(f.index)+1) + copy(index, f.index) + index[len(f.index)] = i + + ft := sf.Type + if ft.Name() == "" && ft.Kind() == reflect.Ptr { + // Follow pointer. + ft = ft.Elem() + } + + // Only maps can be extra. + extra := false + if tagx != "" { + switch ft.Kind() { + case reflect.Map: + extra = true + default: + continue + } + } + + // Only strings, floats, integers, and booleans can be quoted. + quoted := false + if opts.Contains("string") { + switch ft.Kind() { + case reflect.Bool, + reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, + reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr, + reflect.Float32, reflect.Float64, + reflect.String: + quoted = true + } + } + + // Record found field and index sequence. + if name != "" || !sf.Anonymous || ft.Kind() != reflect.Struct { + tagged := name != "" + if name == "" { + name = sf.Name + } + field := field{ + name: name, + tag: tagged, + index: index, + typ: ft, + omitEmpty: opts.Contains("omitempty"), + extra: extra, + quoted: quoted, + } + field.nameBytes = []byte(field.name) + field.equalFold = foldFunc(field.nameBytes) + + // Build nameEscHTML and nameNonEsc ahead of time. + nameEscBuf.Reset() + nameEscBuf.WriteString(`"`) + HTMLEscape(&nameEscBuf, field.nameBytes) + nameEscBuf.WriteString(`":`) + field.nameEscHTML = nameEscBuf.String() + field.nameNonEsc = `"` + field.name + `":` + + fields = append(fields, field) + if count[f.typ] > 1 { + // If there were multiple instances, add a second, + // so that the annihilation code will see a duplicate. + // It only cares about the distinction between 1 or 2, + // so don't bother generating any more copies. + fields = append(fields, fields[len(fields)-1]) + } + continue + } + + // Record new anonymous struct to explore in next round. + nextCount[ft]++ + if nextCount[ft] == 1 { + next = append(next, field{name: ft.Name(), index: index, typ: ft}) + } + } + } + } + + sort.Slice(fields, func(i, j int) bool { + x := fields + // sort field by name, breaking ties with depth, then + // breaking ties with "name came from json tag", then + // breaking ties with index sequence. + if x[i].name != x[j].name { + return x[i].name < x[j].name + } + if len(x[i].index) != len(x[j].index) { + return len(x[i].index) < len(x[j].index) + } + if x[i].tag != x[j].tag { + return x[i].tag + } + return byIndex(x).Less(i, j) + }) + + // Delete all fields that are hidden by the Go rules for embedded fields, + // except that fields with JSON tags are promoted. + + // The fields are sorted in primary order of name, secondary order + // of field index length. Loop over names; for each name, delete + // hidden fields by choosing the one dominant field that survives. + out := fields[:0] + for advance, i := 0, 0; i < len(fields); i += advance { + // One iteration per name. + // Find the sequence of fields with the name of this first field. + fi := fields[i] + name := fi.name + for advance = 1; i+advance < len(fields); advance++ { + fj := fields[i+advance] + if fj.name != name { + break + } + } + if advance == 1 { // Only one field with this name + out = append(out, fi) + continue + } + dominant, ok := dominantField(fields[i : i+advance]) + if ok { + out = append(out, dominant) + } + } + + fields = out + sort.Sort(byIndex(fields)) + + for i := range fields { + f := &fields[i] + f.encoder = typeEncoder(typeByIndex(t, f.index)) + } + nameIndex := make(map[string]int, len(fields)) + for i, field := range fields { + nameIndex[field.name] = i + } + return structFields{fields, nameIndex} +} + +// dominantField looks through the fields, all of which are known to +// have the same name, to find the single field that dominates the +// others using Go's embedding rules, modified by the presence of +// JSON tags. If there are multiple top-level fields, the boolean +// will be false: This condition is an error in Go and we skip all +// the fields. +func dominantField(fields []field) (field, bool) { + // The fields are sorted in increasing index-length order, then by presence of tag. + // That means that the first field is the dominant one. We need only check + // for error cases: two fields at top level, either both tagged or neither tagged. + if len(fields) > 1 && len(fields[0].index) == len(fields[1].index) && fields[0].tag == fields[1].tag { + return field{}, false + } + return fields[0], true +} + +var fieldCache sync.Map // map[reflect.Type]structFields + +// cachedTypeFields is like typeFields but uses a cache to avoid repeated work. +func cachedTypeFields(t reflect.Type) structFields { + if f, ok := fieldCache.Load(t); ok { + return f.(structFields) + } + f, _ := fieldCache.LoadOrStore(t, typeFields(t)) + return f.(structFields) +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/fold.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/fold.go new file mode 100644 index 00000000..316ea018 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/fold.go @@ -0,0 +1,143 @@ +// Copyright 2013 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 jsonx + +import ( + "bytes" + "unicode/utf8" +) + +const ( + caseMask = ^byte(0x20) // Mask to ignore case in ASCII. + kelvin = '\u212a' + smallLongEss = '\u017f' +) + +// foldFunc returns one of four different case folding equivalence +// functions, from most general (and slow) to fastest: +// +// 1) bytes.EqualFold, if the key s contains any non-ASCII UTF-8 +// 2) equalFoldRight, if s contains special folding ASCII ('k', 'K', 's', 'S') +// 3) asciiEqualFold, no special, but includes non-letters (including _) +// 4) simpleLetterEqualFold, no specials, no non-letters. +// +// The letters S and K are special because they map to 3 runes, not just 2: +// * S maps to s and to U+017F 'ſ' Latin small letter long s +// * k maps to K and to U+212A 'K' Kelvin sign +// See https://play.golang.org/p/tTxjOc0OGo +// +// The returned function is specialized for matching against s and +// should only be given s. It's not curried for performance reasons. +func foldFunc(s []byte) func(s, t []byte) bool { + nonLetter := false + special := false // special letter + for _, b := range s { + if b >= utf8.RuneSelf { + return bytes.EqualFold + } + upper := b & caseMask + if upper < 'A' || upper > 'Z' { + nonLetter = true + } else if upper == 'K' || upper == 'S' { + // See above for why these letters are special. + special = true + } + } + if special { + return equalFoldRight + } + if nonLetter { + return asciiEqualFold + } + return simpleLetterEqualFold +} + +// equalFoldRight is a specialization of bytes.EqualFold when s is +// known to be all ASCII (including punctuation), but contains an 's', +// 'S', 'k', or 'K', requiring a Unicode fold on the bytes in t. +// See comments on foldFunc. +func equalFoldRight(s, t []byte) bool { + for _, sb := range s { + if len(t) == 0 { + return false + } + tb := t[0] + if tb < utf8.RuneSelf { + if sb != tb { + sbUpper := sb & caseMask + if 'A' <= sbUpper && sbUpper <= 'Z' { + if sbUpper != tb&caseMask { + return false + } + } else { + return false + } + } + t = t[1:] + continue + } + // sb is ASCII and t is not. t must be either kelvin + // sign or long s; sb must be s, S, k, or K. + tr, size := utf8.DecodeRune(t) + switch sb { + case 's', 'S': + if tr != smallLongEss { + return false + } + case 'k', 'K': + if tr != kelvin { + return false + } + default: + return false + } + t = t[size:] + + } + if len(t) > 0 { + return false + } + return true +} + +// asciiEqualFold is a specialization of bytes.EqualFold for use when +// s is all ASCII (but may contain non-letters) and contains no +// special-folding letters. +// See comments on foldFunc. +func asciiEqualFold(s, t []byte) bool { + if len(s) != len(t) { + return false + } + for i, sb := range s { + tb := t[i] + if sb == tb { + continue + } + if ('a' <= sb && sb <= 'z') || ('A' <= sb && sb <= 'Z') { + if sb&caseMask != tb&caseMask { + return false + } + } else { + return false + } + } + return true +} + +// simpleLetterEqualFold is a specialization of bytes.EqualFold for +// use when s is all ASCII letters (no underscores, etc) and also +// doesn't contain 'k', 'K', 's', or 'S'. +// See comments on foldFunc. +func simpleLetterEqualFold(s, t []byte) bool { + if len(s) != len(t) { + return false + } + for i, b := range s { + if b&caseMask != t[i]&caseMask { + return false + } + } + return true +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/indent.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/indent.go new file mode 100644 index 00000000..15d95cd1 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/indent.go @@ -0,0 +1,141 @@ +// 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 jsonx + +import "bytes" + +// Compact appends to dst the JSON-encoded src with +// insignificant space characters elided. +func Compact(dst *bytes.Buffer, src []byte) error { + return compact(dst, src, false) +} + +func compact(dst *bytes.Buffer, src []byte, escape bool) error { + origLen := dst.Len() + var scan scanner + scan.reset() + start := 0 + for i, c := range src { + if escape && (c == '<' || c == '>' || c == '&') { + if start < i { + dst.Write(src[start:i]) + } + dst.WriteString(`\u00`) + dst.WriteByte(hex[c>>4]) + dst.WriteByte(hex[c&0xF]) + start = i + 1 + } + // Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9). + if c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 { + if start < i { + dst.Write(src[start:i]) + } + dst.WriteString(`\u202`) + dst.WriteByte(hex[src[i+2]&0xF]) + start = i + 3 + } + v := scan.step(&scan, c) + if v >= scanSkipSpace { + if v == scanError { + break + } + if start < i { + dst.Write(src[start:i]) + } + start = i + 1 + } + } + if scan.eof() == scanError { + dst.Truncate(origLen) + return scan.err + } + if start < len(src) { + dst.Write(src[start:]) + } + return nil +} + +func newline(dst *bytes.Buffer, prefix, indent string, depth int) { + dst.WriteByte('\n') + dst.WriteString(prefix) + for i := 0; i < depth; i++ { + dst.WriteString(indent) + } +} + +// Indent appends to dst an indented form of the JSON-encoded src. +// Each element in a JSON object or array begins on a new, +// indented line beginning with prefix followed by one or more +// copies of indent according to the indentation nesting. +// The data appended to dst does not begin with the prefix nor +// any indentation, to make it easier to embed inside other formatted JSON data. +// Although leading space characters (space, tab, carriage return, newline) +// at the beginning of src are dropped, trailing space characters +// at the end of src are preserved and copied to dst. +// For example, if src has no trailing spaces, neither will dst; +// if src ends in a trailing newline, so will dst. +func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error { + origLen := dst.Len() + var scan scanner + scan.reset() + needIndent := false + depth := 0 + for _, c := range src { + scan.bytes++ + v := scan.step(&scan, c) + if v == scanSkipSpace { + continue + } + if v == scanError { + break + } + if needIndent && v != scanEndObject && v != scanEndArray { + needIndent = false + depth++ + newline(dst, prefix, indent, depth) + } + + // Emit semantically uninteresting bytes + // (in particular, punctuation in strings) unmodified. + if v == scanContinue { + dst.WriteByte(c) + continue + } + + // Add spacing around real punctuation. + switch c { + case '{', '[': + // delay indent so that empty object and array are formatted as {} and []. + needIndent = true + dst.WriteByte(c) + + case ',': + dst.WriteByte(c) + newline(dst, prefix, indent, depth) + + case ':': + dst.WriteByte(c) + dst.WriteByte(' ') + + case '}', ']': + if needIndent { + // suppress indent in empty object/array + needIndent = false + } else { + depth-- + newline(dst, prefix, indent, depth) + } + dst.WriteByte(c) + + default: + dst.WriteByte(c) + } + } + if scan.eof() == scanError { + dst.Truncate(origLen) + return scan.err + } + return nil +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/scanner.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/scanner.go new file mode 100644 index 00000000..780c5e45 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/scanner.go @@ -0,0 +1,573 @@ +// 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 jsonx + +// JSON value parser state machine. +// Just about at the limit of what is reasonable to write by hand. +// Some parts are a bit tedious, but overall it nicely factors out the +// otherwise common code from the multiple scanning functions +// in this package (Compact, Indent, checkValid, etc). +// +// This file starts with two simple examples using the scanner +// before diving into the scanner itself. + +import "strconv" + +// Valid reports whether data is a valid JSON encoding. +func Valid(data []byte) bool { + return checkValid(data, &scanner{}) == nil +} + +// checkValid verifies that data is valid JSON-encoded data. +// scan is passed in for use by checkValid to avoid an allocation. +func checkValid(data []byte, scan *scanner) error { + scan.reset() + for _, c := range data { + scan.bytes++ + if scan.step(scan, c) == scanError { + return scan.err + } + } + if scan.eof() == scanError { + return scan.err + } + return nil +} + +// A SyntaxError is a description of a JSON syntax error. +type SyntaxError struct { + msg string // description of error + Offset int64 // error occurred after reading Offset bytes +} + +func (e *SyntaxError) Error() string { return e.msg } + +// A scanner is a JSON scanning state machine. +// Callers call scan.reset() and then pass bytes in one at a time +// by calling scan.step(&scan, c) for each byte. +// The return value, referred to as an opcode, tells the +// caller about significant parsing events like beginning +// and ending literals, objects, and arrays, so that the +// caller can follow along if it wishes. +// The return value scanEnd indicates that a single top-level +// JSON value has been completed, *before* the byte that +// just got passed in. (The indication must be delayed in order +// to recognize the end of numbers: is 123 a whole value or +// the beginning of 12345e+6?). +type scanner struct { + // The step is a func to be called to execute the next transition. + // Also tried using an integer constant and a single func + // with a switch, but using the func directly was 10% faster + // on a 64-bit Mac Mini, and it's nicer to read. + step func(*scanner, byte) int + + // Reached end of top-level value. + endTop bool + + // Stack of what we're in the middle of - array values, object keys, object values. + parseState []int + + // Error that happened, if any. + err error + + // total bytes consumed, updated by decoder.Decode + bytes int64 +} + +// These values are returned by the state transition functions +// assigned to scanner.state and the method scanner.eof. +// They give details about the current state of the scan that +// callers might be interested to know about. +// It is okay to ignore the return value of any particular +// call to scanner.state: if one call returns scanError, +// every subsequent call will return scanError too. +const ( + // Continue. + scanContinue = iota // uninteresting byte + scanBeginLiteral // end implied by next result != scanContinue + scanBeginObject // begin object + scanObjectKey // just finished object key (string) + scanObjectValue // just finished non-last object value + scanEndObject // end object (implies scanObjectValue if possible) + scanBeginArray // begin array + scanArrayValue // just finished array value + scanEndArray // end array (implies scanArrayValue if possible) + scanSkipSpace // space byte; can skip; known to be last "continue" result + + // Stop. + scanEnd // top-level value ended *before* this byte; known to be first "stop" result + scanError // hit an error, scanner.err. +) + +// These values are stored in the parseState stack. +// They give the current state of a composite value +// being scanned. If the parser is inside a nested value +// the parseState describes the nested state, outermost at entry 0. +const ( + parseObjectKey = iota // parsing object key (before colon) + parseObjectValue // parsing object value (after colon) + parseArrayValue // parsing array value +) + +// reset prepares the scanner for use. +// It must be called before calling s.step. +func (s *scanner) reset() { + s.step = stateBeginValue + s.parseState = s.parseState[0:0] + s.err = nil + s.endTop = false +} + +// eof tells the scanner that the end of input has been reached. +// It returns a scan status just as s.step does. +func (s *scanner) eof() int { + if s.err != nil { + return scanError + } + if s.endTop { + return scanEnd + } + s.step(s, ' ') + if s.endTop { + return scanEnd + } + if s.err == nil { + s.err = &SyntaxError{"unexpected end of JSON input", s.bytes} + } + return scanError +} + +// pushParseState pushes a new parse state p onto the parse stack. +func (s *scanner) pushParseState(p int) { + s.parseState = append(s.parseState, p) +} + +// popParseState pops a parse state (already obtained) off the stack +// and updates s.step accordingly. +func (s *scanner) popParseState() { + n := len(s.parseState) - 1 + s.parseState = s.parseState[0:n] + if n == 0 { + s.step = stateEndTop + s.endTop = true + } else { + s.step = stateEndValue + } +} + +func isSpace(c byte) bool { + return c == ' ' || c == '\t' || c == '\r' || c == '\n' +} + +// stateBeginValueOrEmpty is the state after reading `[`. +func stateBeginValueOrEmpty(s *scanner, c byte) int { + if c <= ' ' && isSpace(c) { + return scanSkipSpace + } + if c == ']' { + return stateEndValue(s, c) + } + return stateBeginValue(s, c) +} + +// stateBeginValue is the state at the beginning of the input. +func stateBeginValue(s *scanner, c byte) int { + if c <= ' ' && isSpace(c) { + return scanSkipSpace + } + switch c { + case '{': + s.step = stateBeginStringOrEmpty + s.pushParseState(parseObjectKey) + return scanBeginObject + case '[': + s.step = stateBeginValueOrEmpty + s.pushParseState(parseArrayValue) + return scanBeginArray + case '"': + s.step = stateInString + return scanBeginLiteral + case '-': + s.step = stateNeg + return scanBeginLiteral + case '0': // beginning of 0.123 + s.step = state0 + return scanBeginLiteral + case 't': // beginning of true + s.step = stateT + return scanBeginLiteral + case 'f': // beginning of false + s.step = stateF + return scanBeginLiteral + case 'n': // beginning of null + s.step = stateN + return scanBeginLiteral + } + if '1' <= c && c <= '9' { // beginning of 1234.5 + s.step = state1 + return scanBeginLiteral + } + return s.error(c, "looking for beginning of value") +} + +// stateBeginStringOrEmpty is the state after reading `{`. +func stateBeginStringOrEmpty(s *scanner, c byte) int { + if c <= ' ' && isSpace(c) { + return scanSkipSpace + } + if c == '}' { + n := len(s.parseState) + s.parseState[n-1] = parseObjectValue + return stateEndValue(s, c) + } + return stateBeginString(s, c) +} + +// stateBeginString is the state after reading `{"key": value,`. +func stateBeginString(s *scanner, c byte) int { + if c <= ' ' && isSpace(c) { + return scanSkipSpace + } + if c == '"' { + s.step = stateInString + return scanBeginLiteral + } + return s.error(c, "looking for beginning of object key string") +} + +// stateEndValue is the state after completing a value, +// such as after reading `{}` or `true` or `["x"`. +func stateEndValue(s *scanner, c byte) int { + n := len(s.parseState) + if n == 0 { + // Completed top-level before the current byte. + s.step = stateEndTop + s.endTop = true + return stateEndTop(s, c) + } + if c <= ' ' && isSpace(c) { + s.step = stateEndValue + return scanSkipSpace + } + ps := s.parseState[n-1] + switch ps { + case parseObjectKey: + if c == ':' { + s.parseState[n-1] = parseObjectValue + s.step = stateBeginValue + return scanObjectKey + } + return s.error(c, "after object key") + case parseObjectValue: + if c == ',' { + s.parseState[n-1] = parseObjectKey + s.step = stateBeginString + return scanObjectValue + } + if c == '}' { + s.popParseState() + return scanEndObject + } + return s.error(c, "after object key:value pair") + case parseArrayValue: + if c == ',' { + s.step = stateBeginValue + return scanArrayValue + } + if c == ']' { + s.popParseState() + return scanEndArray + } + return s.error(c, "after array element") + } + return s.error(c, "") +} + +// stateEndTop is the state after finishing the top-level value, +// such as after reading `{}` or `[1,2,3]`. +// Only space characters should be seen now. +func stateEndTop(s *scanner, c byte) int { + if !isSpace(c) { + // Complain about non-space byte on next call. + s.error(c, "after top-level value") + } + return scanEnd +} + +// stateInString is the state after reading `"`. +func stateInString(s *scanner, c byte) int { + if c == '"' { + s.step = stateEndValue + return scanContinue + } + if c == '\\' { + s.step = stateInStringEsc + return scanContinue + } + if c < 0x20 { + return s.error(c, "in string literal") + } + return scanContinue +} + +// stateInStringEsc is the state after reading `"\` during a quoted string. +func stateInStringEsc(s *scanner, c byte) int { + switch c { + case 'b', 'f', 'n', 'r', 't', '\\', '/', '"': + s.step = stateInString + return scanContinue + case 'u': + s.step = stateInStringEscU + return scanContinue + } + return s.error(c, "in string escape code") +} + +// stateInStringEscU is the state after reading `"\u` during a quoted string. +func stateInStringEscU(s *scanner, c byte) int { + if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' { + s.step = stateInStringEscU1 + return scanContinue + } + // numbers + return s.error(c, "in \\u hexadecimal character escape") +} + +// stateInStringEscU1 is the state after reading `"\u1` during a quoted string. +func stateInStringEscU1(s *scanner, c byte) int { + if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' { + s.step = stateInStringEscU12 + return scanContinue + } + // numbers + return s.error(c, "in \\u hexadecimal character escape") +} + +// stateInStringEscU12 is the state after reading `"\u12` during a quoted string. +func stateInStringEscU12(s *scanner, c byte) int { + if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' { + s.step = stateInStringEscU123 + return scanContinue + } + // numbers + return s.error(c, "in \\u hexadecimal character escape") +} + +// stateInStringEscU123 is the state after reading `"\u123` during a quoted string. +func stateInStringEscU123(s *scanner, c byte) int { + if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' { + s.step = stateInString + return scanContinue + } + // numbers + return s.error(c, "in \\u hexadecimal character escape") +} + +// stateNeg is the state after reading `-` during a number. +func stateNeg(s *scanner, c byte) int { + if c == '0' { + s.step = state0 + return scanContinue + } + if '1' <= c && c <= '9' { + s.step = state1 + return scanContinue + } + return s.error(c, "in numeric literal") +} + +// state1 is the state after reading a non-zero integer during a number, +// such as after reading `1` or `100` but not `0`. +func state1(s *scanner, c byte) int { + if '0' <= c && c <= '9' { + s.step = state1 + return scanContinue + } + return state0(s, c) +} + +// state0 is the state after reading `0` during a number. +func state0(s *scanner, c byte) int { + if c == '.' { + s.step = stateDot + return scanContinue + } + if c == 'e' || c == 'E' { + s.step = stateE + return scanContinue + } + return stateEndValue(s, c) +} + +// stateDot is the state after reading the integer and decimal point in a number, +// such as after reading `1.`. +func stateDot(s *scanner, c byte) int { + if '0' <= c && c <= '9' { + s.step = stateDot0 + return scanContinue + } + return s.error(c, "after decimal point in numeric literal") +} + +// stateDot0 is the state after reading the integer, decimal point, and subsequent +// digits of a number, such as after reading `3.14`. +func stateDot0(s *scanner, c byte) int { + if '0' <= c && c <= '9' { + return scanContinue + } + if c == 'e' || c == 'E' { + s.step = stateE + return scanContinue + } + return stateEndValue(s, c) +} + +// stateE is the state after reading the mantissa and e in a number, +// such as after reading `314e` or `0.314e`. +func stateE(s *scanner, c byte) int { + if c == '+' || c == '-' { + s.step = stateESign + return scanContinue + } + return stateESign(s, c) +} + +// stateESign is the state after reading the mantissa, e, and sign in a number, +// such as after reading `314e-` or `0.314e+`. +func stateESign(s *scanner, c byte) int { + if '0' <= c && c <= '9' { + s.step = stateE0 + return scanContinue + } + return s.error(c, "in exponent of numeric literal") +} + +// stateE0 is the state after reading the mantissa, e, optional sign, +// and at least one digit of the exponent in a number, +// such as after reading `314e-2` or `0.314e+1` or `3.14e0`. +func stateE0(s *scanner, c byte) int { + if '0' <= c && c <= '9' { + return scanContinue + } + return stateEndValue(s, c) +} + +// stateT is the state after reading `t`. +func stateT(s *scanner, c byte) int { + if c == 'r' { + s.step = stateTr + return scanContinue + } + return s.error(c, "in literal true (expecting 'r')") +} + +// stateTr is the state after reading `tr`. +func stateTr(s *scanner, c byte) int { + if c == 'u' { + s.step = stateTru + return scanContinue + } + return s.error(c, "in literal true (expecting 'u')") +} + +// stateTru is the state after reading `tru`. +func stateTru(s *scanner, c byte) int { + if c == 'e' { + s.step = stateEndValue + return scanContinue + } + return s.error(c, "in literal true (expecting 'e')") +} + +// stateF is the state after reading `f`. +func stateF(s *scanner, c byte) int { + if c == 'a' { + s.step = stateFa + return scanContinue + } + return s.error(c, "in literal false (expecting 'a')") +} + +// stateFa is the state after reading `fa`. +func stateFa(s *scanner, c byte) int { + if c == 'l' { + s.step = stateFal + return scanContinue + } + return s.error(c, "in literal false (expecting 'l')") +} + +// stateFal is the state after reading `fal`. +func stateFal(s *scanner, c byte) int { + if c == 's' { + s.step = stateFals + return scanContinue + } + return s.error(c, "in literal false (expecting 's')") +} + +// stateFals is the state after reading `fals`. +func stateFals(s *scanner, c byte) int { + if c == 'e' { + s.step = stateEndValue + return scanContinue + } + return s.error(c, "in literal false (expecting 'e')") +} + +// stateN is the state after reading `n`. +func stateN(s *scanner, c byte) int { + if c == 'u' { + s.step = stateNu + return scanContinue + } + return s.error(c, "in literal null (expecting 'u')") +} + +// stateNu is the state after reading `nu`. +func stateNu(s *scanner, c byte) int { + if c == 'l' { + s.step = stateNul + return scanContinue + } + return s.error(c, "in literal null (expecting 'l')") +} + +// stateNul is the state after reading `nul`. +func stateNul(s *scanner, c byte) int { + if c == 'l' { + s.step = stateEndValue + return scanContinue + } + return s.error(c, "in literal null (expecting 'l')") +} + +// stateError is the state after reaching a syntax error, +// such as after reading `[1}` or `5.1.2`. +func stateError(s *scanner, c byte) int { + return scanError +} + +// error records an error and switches to the error state. +func (s *scanner) error(c byte, context string) int { + s.step = stateError + s.err = &SyntaxError{"invalid character " + quoteChar(c) + " " + context, s.bytes} + return scanError +} + +// quoteChar formats c as a quoted character literal +func quoteChar(c byte) string { + // special cases - different from quoted strings + if c == '\'' { + return `'\''` + } + if c == '"' { + return `'"'` + } + + // use quoted string with different quotation marks + s := strconv.Quote(string(c)) + return "'" + s[1:len(s)-1] + "'" +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/stream.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/stream.go new file mode 100644 index 00000000..0f00c037 --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/stream.go @@ -0,0 +1,507 @@ +// 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 jsonx + +import ( + "bytes" + "errors" + "io" +) + +// A Decoder reads and decodes JSON values from an input stream. +type Decoder struct { + r io.Reader + buf []byte + d decodeState + scanp int // start of unread data in buf + scanned int64 // amount of data already scanned + scan scanner + err error + + tokenState int + tokenStack []int +} + +// NewDecoder returns a new decoder that reads from r. +// +// The decoder introduces its own buffering and may +// read data from r beyond the JSON values requested. +func NewDecoder(r io.Reader) *Decoder { + return &Decoder{r: r} +} + +// UseNumber causes the Decoder to unmarshal a number into an interface{} as a +// Number instead of as a float64. +func (dec *Decoder) UseNumber() { dec.d.useNumber = true } + +// DisallowUnknownFields causes the Decoder to return an error when the destination +// is a struct and the input contains object keys which do not match any +// non-ignored, exported fields in the destination. +func (dec *Decoder) DisallowUnknownFields() { dec.d.disallowUnknownFields = true } + +// Decode reads the next JSON-encoded value from its +// input and stores it in the value pointed to by v. +// +// See the documentation for Unmarshal for details about +// the conversion of JSON into a Go value. +func (dec *Decoder) Decode(v interface{}) error { + if dec.err != nil { + return dec.err + } + + if err := dec.tokenPrepareForDecode(); err != nil { + return err + } + + if !dec.tokenValueAllowed() { + return &SyntaxError{msg: "not at beginning of value", Offset: dec.offset()} + } + + // Read whole value into buffer. + n, err := dec.readValue() + if err != nil { + return err + } + dec.d.init(dec.buf[dec.scanp : dec.scanp+n]) + dec.scanp += n + + // Don't save err from unmarshal into dec.err: + // the connection is still usable since we read a complete JSON + // object from it before the error happened. + err = dec.d.unmarshal(v) + + // fixup token streaming state + dec.tokenValueEnd() + + return err +} + +// Buffered returns a reader of the data remaining in the Decoder's +// buffer. The reader is valid until the next call to Decode. +func (dec *Decoder) Buffered() io.Reader { + return bytes.NewReader(dec.buf[dec.scanp:]) +} + +// readValue reads a JSON value into dec.buf. +// It returns the length of the encoding. +func (dec *Decoder) readValue() (int, error) { + dec.scan.reset() + + scanp := dec.scanp + var err error +Input: + // help the compiler see that scanp is never negative, so it can remove + // some bounds checks below. + for scanp >= 0 { + + // Look in the buffer for a new value. + for ; scanp < len(dec.buf); scanp++ { + c := dec.buf[scanp] + dec.scan.bytes++ + switch dec.scan.step(&dec.scan, c) { + case scanEnd: + break Input + case scanEndObject, scanEndArray: + // scanEnd is delayed one byte. + // We might block trying to get that byte from src, + // so instead invent a space byte. + if stateEndValue(&dec.scan, ' ') == scanEnd { + scanp++ + break Input + } + case scanError: + dec.err = dec.scan.err + return 0, dec.scan.err + } + } + + // Did the last read have an error? + // Delayed until now to allow buffer scan. + if err != nil { + if err == io.EOF { + if dec.scan.step(&dec.scan, ' ') == scanEnd { + break Input + } + if nonSpace(dec.buf) { + err = io.ErrUnexpectedEOF + } + } + dec.err = err + return 0, err + } + + n := scanp - dec.scanp + err = dec.refill() + scanp = dec.scanp + n + } + return scanp - dec.scanp, nil +} + +func (dec *Decoder) refill() error { + // Make room to read more into the buffer. + // First slide down data already consumed. + if dec.scanp > 0 { + dec.scanned += int64(dec.scanp) + n := copy(dec.buf, dec.buf[dec.scanp:]) + dec.buf = dec.buf[:n] + dec.scanp = 0 + } + + // Grow buffer if not large enough. + const minRead = 512 + if cap(dec.buf)-len(dec.buf) < minRead { + newBuf := make([]byte, len(dec.buf), 2*cap(dec.buf)+minRead) + copy(newBuf, dec.buf) + dec.buf = newBuf + } + + // Read. Delay error for next iteration (after scan). + n, err := dec.r.Read(dec.buf[len(dec.buf):cap(dec.buf)]) + dec.buf = dec.buf[0 : len(dec.buf)+n] + + return err +} + +func nonSpace(b []byte) bool { + for _, c := range b { + if !isSpace(c) { + return true + } + } + return false +} + +// An Encoder writes JSON values to an output stream. +type Encoder struct { + w io.Writer + err error + escapeHTML bool + + indentBuf *bytes.Buffer + indentPrefix string + indentValue string +} + +// NewEncoder returns a new encoder that writes to w. +func NewEncoder(w io.Writer) *Encoder { + return &Encoder{w: w, escapeHTML: true} +} + +// Encode writes the JSON encoding of v to the stream, +// followed by a newline character. +// +// See the documentation for Marshal for details about the +// conversion of Go values to JSON. +func (enc *Encoder) Encode(v interface{}) error { + if enc.err != nil { + return enc.err + } + e := newEncodeState() + err := e.marshal(v, encOpts{escapeHTML: enc.escapeHTML}) + if err != nil { + return err + } + + // Terminate each value with a newline. + // This makes the output look a little nicer + // when debugging, and some kind of space + // is required if the encoded value was a number, + // so that the reader knows there aren't more + // digits coming. + e.WriteByte('\n') + + b := e.Bytes() + if enc.indentPrefix != "" || enc.indentValue != "" { + if enc.indentBuf == nil { + enc.indentBuf = new(bytes.Buffer) + } + enc.indentBuf.Reset() + err = Indent(enc.indentBuf, b, enc.indentPrefix, enc.indentValue) + if err != nil { + return err + } + b = enc.indentBuf.Bytes() + } + if _, err = enc.w.Write(b); err != nil { + enc.err = err + } + encodeStatePool.Put(e) + return err +} + +// SetIndent instructs the encoder to format each subsequent encoded +// value as if indented by the package-level function Indent(dst, src, prefix, indent). +// Calling SetIndent("", "") disables indentation. +func (enc *Encoder) SetIndent(prefix, indent string) { + enc.indentPrefix = prefix + enc.indentValue = indent +} + +// SetEscapeHTML specifies whether problematic HTML characters +// should be escaped inside JSON quoted strings. +// The default behavior is to escape &, <, and > to \u0026, \u003c, and \u003e +// to avoid certain safety problems that can arise when embedding JSON in HTML. +// +// In non-HTML settings where the escaping interferes with the readability +// of the output, SetEscapeHTML(false) disables this behavior. +func (enc *Encoder) SetEscapeHTML(on bool) { + enc.escapeHTML = on +} + +// RawMessage is a raw encoded JSON value. +// It implements Marshaler and Unmarshaler and can +// be used to delay JSON decoding or precompute a JSON encoding. +type RawMessage []byte + +// MarshalJSON returns m as the JSON encoding of m. +func (m RawMessage) MarshalJSON() ([]byte, error) { + if m == nil { + return []byte("null"), nil + } + return m, nil +} + +// UnmarshalJSON sets *m to a copy of data. +func (m *RawMessage) UnmarshalJSON(data []byte) error { + if m == nil { + return errors.New("json.RawMessage: UnmarshalJSON on nil pointer") + } + *m = append((*m)[0:0], data...) + return nil +} + +var _ Marshaler = (*RawMessage)(nil) +var _ Unmarshaler = (*RawMessage)(nil) + +// A Token holds a value of one of these types: +// +// Delim, for the four JSON delimiters [ ] { } +// bool, for JSON booleans +// float64, for JSON numbers +// Number, for JSON numbers +// string, for JSON string literals +// nil, for JSON null +// +type Token interface{} + +const ( + tokenTopValue = iota + tokenArrayStart + tokenArrayValue + tokenArrayComma + tokenObjectStart + tokenObjectKey + tokenObjectColon + tokenObjectValue + tokenObjectComma +) + +// advance tokenstate from a separator state to a value state +func (dec *Decoder) tokenPrepareForDecode() error { + // Note: Not calling peek before switch, to avoid + // putting peek into the standard Decode path. + // peek is only called when using the Token API. + switch dec.tokenState { + case tokenArrayComma: + c, err := dec.peek() + if err != nil { + return err + } + if c != ',' { + return &SyntaxError{"expected comma after array element", dec.offset()} + } + dec.scanp++ + dec.tokenState = tokenArrayValue + case tokenObjectColon: + c, err := dec.peek() + if err != nil { + return err + } + if c != ':' { + return &SyntaxError{"expected colon after object key", dec.offset()} + } + dec.scanp++ + dec.tokenState = tokenObjectValue + } + return nil +} + +func (dec *Decoder) tokenValueAllowed() bool { + switch dec.tokenState { + case tokenTopValue, tokenArrayStart, tokenArrayValue, tokenObjectValue: + return true + } + return false +} + +func (dec *Decoder) tokenValueEnd() { + switch dec.tokenState { + case tokenArrayStart, tokenArrayValue: + dec.tokenState = tokenArrayComma + case tokenObjectValue: + dec.tokenState = tokenObjectComma + } +} + +// A Delim is a JSON array or object delimiter, one of [ ] { or }. +type Delim rune + +func (d Delim) String() string { + return string(d) +} + +// Token returns the next JSON token in the input stream. +// At the end of the input stream, Token returns nil, io.EOF. +// +// Token guarantees that the delimiters [ ] { } it returns are +// properly nested and matched: if Token encounters an unexpected +// delimiter in the input, it will return an error. +// +// The input stream consists of basic JSON values—bool, string, +// number, and null—along with delimiters [ ] { } of type Delim +// to mark the start and end of arrays and objects. +// Commas and colons are elided. +func (dec *Decoder) Token() (Token, error) { + for { + c, err := dec.peek() + if err != nil { + return nil, err + } + switch c { + case '[': + if !dec.tokenValueAllowed() { + return dec.tokenError(c) + } + dec.scanp++ + dec.tokenStack = append(dec.tokenStack, dec.tokenState) + dec.tokenState = tokenArrayStart + return Delim('['), nil + + case ']': + if dec.tokenState != tokenArrayStart && dec.tokenState != tokenArrayComma { + return dec.tokenError(c) + } + dec.scanp++ + dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1] + dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1] + dec.tokenValueEnd() + return Delim(']'), nil + + case '{': + if !dec.tokenValueAllowed() { + return dec.tokenError(c) + } + dec.scanp++ + dec.tokenStack = append(dec.tokenStack, dec.tokenState) + dec.tokenState = tokenObjectStart + return Delim('{'), nil + + case '}': + if dec.tokenState != tokenObjectStart && dec.tokenState != tokenObjectComma { + return dec.tokenError(c) + } + dec.scanp++ + dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1] + dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1] + dec.tokenValueEnd() + return Delim('}'), nil + + case ':': + if dec.tokenState != tokenObjectColon { + return dec.tokenError(c) + } + dec.scanp++ + dec.tokenState = tokenObjectValue + continue + + case ',': + if dec.tokenState == tokenArrayComma { + dec.scanp++ + dec.tokenState = tokenArrayValue + continue + } + if dec.tokenState == tokenObjectComma { + dec.scanp++ + dec.tokenState = tokenObjectKey + continue + } + return dec.tokenError(c) + + case '"': + if dec.tokenState == tokenObjectStart || dec.tokenState == tokenObjectKey { + var x string + old := dec.tokenState + dec.tokenState = tokenTopValue + err := dec.Decode(&x) + dec.tokenState = old + if err != nil { + return nil, err + } + dec.tokenState = tokenObjectColon + return x, nil + } + fallthrough + + default: + if !dec.tokenValueAllowed() { + return dec.tokenError(c) + } + var x interface{} + if err := dec.Decode(&x); err != nil { + return nil, err + } + return x, nil + } + } +} + +func (dec *Decoder) tokenError(c byte) (Token, error) { + var context string + switch dec.tokenState { + case tokenTopValue: + context = " looking for beginning of value" + case tokenArrayStart, tokenArrayValue, tokenObjectValue: + context = " looking for beginning of value" + case tokenArrayComma: + context = " after array element" + case tokenObjectKey: + context = " looking for beginning of object key string" + case tokenObjectColon: + context = " after object key" + case tokenObjectComma: + context = " after object key:value pair" + } + return nil, &SyntaxError{"invalid character " + quoteChar(c) + context, dec.offset()} +} + +// More reports whether there is another element in the +// current array or object being parsed. +func (dec *Decoder) More() bool { + c, err := dec.peek() + return err == nil && c != ']' && c != '}' +} + +func (dec *Decoder) peek() (byte, error) { + var err error + for { + for i := dec.scanp; i < len(dec.buf); i++ { + c := dec.buf[i] + if isSpace(c) { + continue + } + dec.scanp = i + return c, nil + } + // buffer has been scanned, now report any error + if err != nil { + return 0, err + } + err = dec.refill() + } +} + +func (dec *Decoder) offset() int64 { + return dec.scanned + int64(dec.scanp) +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/tables.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/tables.go new file mode 100644 index 00000000..cb994a3e --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/tables.go @@ -0,0 +1,218 @@ +// Copyright 2016 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 jsonx + +import "unicode/utf8" + +// safeSet holds the value true if the ASCII character with the given array +// position can be represented inside a JSON string without any further +// escaping. +// +// All values are true except for the ASCII control characters (0-31), the +// double quote ("), and the backslash character ("\"). +var safeSet = [utf8.RuneSelf]bool{ + ' ': true, + '!': true, + '"': false, + '#': true, + '$': true, + '%': true, + '&': true, + '\'': true, + '(': true, + ')': true, + '*': true, + '+': true, + ',': true, + '-': true, + '.': true, + '/': true, + '0': true, + '1': true, + '2': true, + '3': true, + '4': true, + '5': true, + '6': true, + '7': true, + '8': true, + '9': true, + ':': true, + ';': true, + '<': true, + '=': true, + '>': true, + '?': true, + '@': true, + 'A': true, + 'B': true, + 'C': true, + 'D': true, + 'E': true, + 'F': true, + 'G': true, + 'H': true, + 'I': true, + 'J': true, + 'K': true, + 'L': true, + 'M': true, + 'N': true, + 'O': true, + 'P': true, + 'Q': true, + 'R': true, + 'S': true, + 'T': true, + 'U': true, + 'V': true, + 'W': true, + 'X': true, + 'Y': true, + 'Z': true, + '[': true, + '\\': false, + ']': true, + '^': true, + '_': true, + '`': true, + 'a': true, + 'b': true, + 'c': true, + 'd': true, + 'e': true, + 'f': true, + 'g': true, + 'h': true, + 'i': true, + 'j': true, + 'k': true, + 'l': true, + 'm': true, + 'n': true, + 'o': true, + 'p': true, + 'q': true, + 'r': true, + 's': true, + 't': true, + 'u': true, + 'v': true, + 'w': true, + 'x': true, + 'y': true, + 'z': true, + '{': true, + '|': true, + '}': true, + '~': true, + '\u007f': true, +} + +// htmlSafeSet holds the value true if the ASCII character with the given +// array position can be safely represented inside a JSON string, embedded +// inside of HTML <script> tags, without any additional escaping. +// +// All values are true except for the ASCII control characters (0-31), the +// double quote ("), the backslash character ("\"), HTML opening and closing +// tags ("<" and ">"), and the ampersand ("&"). +var htmlSafeSet = [utf8.RuneSelf]bool{ + ' ': true, + '!': true, + '"': false, + '#': true, + '$': true, + '%': true, + '&': false, + '\'': true, + '(': true, + ')': true, + '*': true, + '+': true, + ',': true, + '-': true, + '.': true, + '/': true, + '0': true, + '1': true, + '2': true, + '3': true, + '4': true, + '5': true, + '6': true, + '7': true, + '8': true, + '9': true, + ':': true, + ';': true, + '<': false, + '=': true, + '>': false, + '?': true, + '@': true, + 'A': true, + 'B': true, + 'C': true, + 'D': true, + 'E': true, + 'F': true, + 'G': true, + 'H': true, + 'I': true, + 'J': true, + 'K': true, + 'L': true, + 'M': true, + 'N': true, + 'O': true, + 'P': true, + 'Q': true, + 'R': true, + 'S': true, + 'T': true, + 'U': true, + 'V': true, + 'W': true, + 'X': true, + 'Y': true, + 'Z': true, + '[': true, + '\\': false, + ']': true, + '^': true, + '_': true, + '`': true, + 'a': true, + 'b': true, + 'c': true, + 'd': true, + 'e': true, + 'f': true, + 'g': true, + 'h': true, + 'i': true, + 'j': true, + 'k': true, + 'l': true, + 'm': true, + 'n': true, + 'o': true, + 'p': true, + 'q': true, + 'r': true, + 's': true, + 't': true, + 'u': true, + 'v': true, + 'w': true, + 'x': true, + 'y': true, + 'z': true, + '{': true, + '|': true, + '}': true, + '~': true, + '\u007f': true, +} diff --git a/vendor/github.com/yaegashi/msgraph.go/jsonx/tags.go b/vendor/github.com/yaegashi/msgraph.go/jsonx/tags.go new file mode 100644 index 00000000..e524e12e --- /dev/null +++ b/vendor/github.com/yaegashi/msgraph.go/jsonx/tags.go @@ -0,0 +1,44 @@ +// Copyright 2011 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 jsonx + +import ( + "strings" +) + +// tagOptions is the string following a comma in a struct field's "json" +// tag, or the empty string. It does not include the leading comma. +type tagOptions string + +// parseTag splits a struct field's json tag into its name and +// comma-separated options. +func parseTag(tag string) (string, tagOptions) { + if idx := strings.Index(tag, ","); idx != -1 { + return tag[:idx], tagOptions(tag[idx+1:]) + } + return tag, tagOptions("") +} + +// Contains reports whether a comma-separated list of options +// contains a particular substr flag. substr must be surrounded by a +// string boundary or commas. +func (o tagOptions) Contains(optionName string) bool { + if len(o) == 0 { + return false + } + s := string(o) + for s != "" { + var next string + i := strings.Index(s, ",") + if i >= 0 { + s, next = s[:i], s[i+1:] + } + if s == optionName { + return true + } + s = next + } + return false +} |