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encoding/json: add Decoder.InputOffset for offset access

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This makes Decoder.offset public while renaming it to
Decoder.InputOffset to match encoding/xml Decoder API

Code changes made by Adam Stankiewicz [sheerun@sher.pl]

Fixes #29688

Change-Id: I86dbfd2b2da80160846e92bfa580c53d8d45e2db
Reviewed-on: https://go-review.googlesource.com/c/go/+/200677
Run-TryBot: Johan Brandhorst <johan.brandhorst@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Francesco Renzi 2019-10-11 13:59:15 +01:00 committed by Ian Lance Taylor
parent ac8966aa58
commit ba108c93b8
1 changed files with 8 additions and 5 deletions
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13
src/encoding/json/stream.go
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@ -56,7 +56,7 @@ func (dec *Decoder) Decode(v interface{}) error {
}
if !dec.tokenValueAllowed() {
return &SyntaxError{msg: "not at beginning of value", Offset: dec.offset()}
return &SyntaxError{msg: "not at beginning of value", Offset: dec.InputOffset()}
}
// Read whole value into buffer.
@ -314,7 +314,7 @@ func (dec *Decoder) tokenPrepareForDecode() error {
return err
}
if c != ',' {
return &SyntaxError{"expected comma after array element", dec.offset()}
return &SyntaxError{"expected comma after array element", dec.InputOffset()}
}
dec.scanp++
dec.tokenState = tokenArrayValue
@ -324,7 +324,7 @@ func (dec *Decoder) tokenPrepareForDecode() error {
return err
}
if c != ':' {
return &SyntaxError{"expected colon after object key", dec.offset()}
return &SyntaxError{"expected colon after object key", dec.InputOffset()}
}
dec.scanp++
dec.tokenState = tokenObjectValue
@ -477,7 +477,7 @@ func (dec *Decoder) tokenError(c byte) (Token, error) {
case tokenObjectComma:
context = " after object key:value pair"
}
return nil, &SyntaxError{"invalid character " + quoteChar(c) + context, dec.offset()}
return nil, &SyntaxError{"invalid character " + quoteChar(c) + context, dec.InputOffset()}
}
// More reports whether there is another element in the
@ -506,6 +506,9 @@ func (dec *Decoder) peek() (byte, error) {
}
}
func (dec *Decoder) offset() int64 {
// InputOffset returns the input stream byte offset of the current decoder position.
// The offset gives the location of the end of the most recently returned token
// and the beginning of the next token.
func (dec *Decoder) InputOffset() int64 {
return dec.scanned + int64(dec.scanp)
}