aboutsummaryrefslogtreecommitdiff
path: root/vendor/gopkg.in/mgo.v2/internal/json/stream.go
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/gopkg.in/mgo.v2/internal/json/stream.go')
-rw-r--r--vendor/gopkg.in/mgo.v2/internal/json/stream.go510
1 files changed, 0 insertions, 510 deletions
diff --git a/vendor/gopkg.in/mgo.v2/internal/json/stream.go b/vendor/gopkg.in/mgo.v2/internal/json/stream.go
deleted file mode 100644
index e023702..0000000
--- a/vendor/gopkg.in/mgo.v2/internal/json/stream.go
+++ /dev/null
@@ -1,510 +0,0 @@
-// 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
-
-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
- 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 }
-
-// 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"}
- }
-
- // 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:
- for {
- // Look in the buffer for a new value.
- for i, c := range dec.buf[scanp:] {
- dec.scan.bytes++
- v := dec.scan.step(&dec.scan, c)
- if v == scanEnd {
- scanp += i
- break Input
- }
- // scanEnd is delayed one byte.
- // We might block trying to get that byte from src,
- // so instead invent a space byte.
- if (v == scanEndObject || v == scanEndArray) && dec.scan.step(&dec.scan, ' ') == scanEnd {
- scanp += i + 1
- break Input
- }
- if v == scanError {
- dec.err = dec.scan.err
- return 0, dec.scan.err
- }
- }
- scanp = len(dec.buf)
-
- // 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 {
- 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
-
- ext Extension
-}
-
-// 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()
- e.ext = enc.ext
- 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.indentBuf != nil {
- 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
-}
-
-// Indent sets the encoder to format each encoded value with Indent.
-func (enc *Encoder) Indent(prefix, indent string) {
- enc.indentBuf = new(bytes.Buffer)
- enc.indentPrefix = prefix
- enc.indentValue = indent
-}
-
-// DisableHTMLEscaping causes the encoder not to escape angle brackets
-// ("<" and ">") or ampersands ("&") in JSON strings.
-func (enc *Encoder) DisableHTMLEscaping() {
- enc.escapeHTML = false
-}
-
-// 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) {
- 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", 0}
- }
- 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", 0}
- }
- 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 {
- clearOffset(err)
- 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 {
- clearOffset(err)
- return nil, err
- }
- return x, nil
- }
- }
-}
-
-func clearOffset(err error) {
- if s, ok := err.(*SyntaxError); ok {
- s.Offset = 0
- }
-}
-
-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, 0}
-}
-
-// 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()
- }
-}
-
-/*
-TODO
-
-// EncodeToken writes the given JSON token to the stream.
-// It returns an error if the delimiters [ ] { } are not properly used.
-//
-// EncodeToken does not call Flush, because usually it is part of
-// a larger operation such as Encode, and those will call Flush when finished.
-// Callers that create an Encoder and then invoke EncodeToken directly,
-// without using Encode, need to call Flush when finished to ensure that
-// the JSON is written to the underlying writer.
-func (e *Encoder) EncodeToken(t Token) error {
- ...
-}
-
-*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-29 07:23:02 +0000