json: Decode into native Go data structures

This patch adds an ability to convert JSON-encoded data into
a hierarchy of Go's native data types.

R=rsc
CC=golang-dev
http://codereview.appspot.com/161060

Committer: Russ Cox <rsc@golang.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/pkg/json/error.go b/src/pkg/json/error.go
new file mode 100644
index 000000000..aa5b962ae
--- /dev/null
+++ b/src/pkg/json/error.go
@@ -0,0 +1,19 @@
+// Copyright 2009 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 "fmt"
+
+// ParseError aggregates information about a JSON parse error.  It is
+// compatible with the os.Error interface.
+type ParseError struct {
+	Index	int;	// A byte index in JSON string where the error occurred
+	Token	string;	// An offending token
+}
+
+// Produce a string representation of this ParseError.
+func (pe *ParseError) String() string {
+	return fmt.Sprintf("Unexpected JSON token at position %d: %q.", pe.Index, pe.Token)
+}