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// 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"
"os"
)
// Compact appends to dst the JSON-encoded src with
// insignificant space characters elided.
func Compact(dst *bytes.Buffer, src []byte) os.Error {
origLen := dst.Len()
var scan scanner
scan.reset()
start := 0
for i, c := range src {
v := scan.step(&scan, int(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 has no trailing newline, to make it easier
// to embed inside other formatted JSON data.
func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) os.Error {
origLen := dst.Len()
var scan scanner
scan.reset()
needIndent := false
depth := 0
for _, c := range src {
scan.bytes++
v := scan.step(&scan, int(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
}
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