diff options
Diffstat (limited to 'src/pkg/json/scanner.go')
| -rw-r--r-- | src/pkg/json/scanner.go | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/src/pkg/json/scanner.go b/src/pkg/json/scanner.go index e98ddef5c..49c2edd54 100644 --- a/src/pkg/json/scanner.go +++ b/src/pkg/json/scanner.go @@ -23,6 +23,7 @@ import ( func checkValid(data []byte, scan *scanner) os.Error { scan.reset() for _, c := range data { + scan.bytes++ if scan.step(scan, int(c)) == scanError { return scan.err } @@ -56,10 +57,12 @@ func nextValue(data []byte, scan *scanner) (value, rest []byte, err os.Error) { } // A SyntaxError is a description of a JSON syntax error. -type SyntaxError string - -func (e SyntaxError) String() string { return string(e) } +type SyntaxError struct { + msg string // description of error + Offset int64 // error occurred after reading Offset bytes +} +func (e *SyntaxError) String() 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 @@ -89,6 +92,9 @@ type scanner struct { // 1-byte redo (see undo method) redoCode int redoState func(*scanner, int) int + + // total bytes consumed, updated by decoder.Decode + bytes int64 } // These values are returned by the state transition functions @@ -148,7 +154,7 @@ func (s *scanner) eof() int { return scanEnd } if s.err == nil { - s.err = SyntaxError("unexpected end of JSON input") + s.err = &SyntaxError{"unexpected end of JSON input", s.bytes} } return scanError } @@ -581,7 +587,7 @@ func stateError(s *scanner, c int) int { // error records an error and switches to the error state. func (s *scanner) error(c int, context string) int { s.step = stateError - s.err = SyntaxError("invalid character " + quoteChar(c) + " " + context) + s.err = &SyntaxError{"invalid character " + quoteChar(c) + " " + context, s.bytes} return scanError } |