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JSON stringify collects substrings in one builder array rather than using regular

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string cons. 
Review URL: http://codereview.chromium.org/5567005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5918 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
sandholm@chromium.org 2010-12-06 11:44:16 +00:00
parent bca83462d8
commit 26c05120b6
1 changed files with 56 additions and 31 deletions
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91
src/json.js
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@ -195,75 +195,100 @@ function JSONSerialize(key, holder, replacer, stack, indent, gap) {
}
}
function BasicSerializeArray(value, stack) {
function BasicSerializeArray(value, stack, builder) {
if (StackContains(stack, value)) {
throw MakeTypeError('circular_structure', []);
}
stack.push(value);
var partial = [];
builder.push("[");
var len = value.length;
for (var i = 0; i < len; i++) {
var strP = BasicJSONSerialize($String(i), value, stack);
if (IS_UNDEFINED(strP)) strP = "null";
partial.push(strP);
var before = builder.length;
BasicJSONSerialize($String(i), value, stack, builder);
if (before == builder.length) builder.push("null");
builder.push(",");
}
stack.pop();
return "[" + partial.join() + "]";
if (builder.pop() != ",") {
builder.push("[]"); // Zero length array. Push "[" back on.
} else {
builder.push("]");
}
}
function BasicSerializeObject(value, stack) {
function BasicSerializeObject(value, stack, builder) {
if (StackContains(stack, value)) {
throw MakeTypeError('circular_structure', []);
}
stack.push(value);
var partial = [];
builder.push("{");
for (var p in value) {
if (ObjectHasOwnProperty.call(value, p)) {
var strP = BasicJSONSerialize(p, value, stack);
if (!IS_UNDEFINED(strP)) partial.push(%QuoteJSONString(p) + ":" + strP);
builder.push(%QuoteJSONString(p), ":");
var before = builder.length;
BasicJSONSerialize(p, value, stack, builder);
if (before == builder.length) {
builder.pop();
builder.pop();
} else {
builder.push(",");
}
}
}
stack.pop();
return "{" + partial.join() + "}";
if (builder.pop() != ",") {
builder.push("{}"); // Object has no own properties. Push "{" back on.
} else {
builder.push("}");
}
}
function BasicJSONSerialize(key, holder, stack) {
function BasicJSONSerialize(key, holder, stack, builder) {
var value = holder[key];
if (IS_OBJECT(value) && value) {
var toJSON = value.toJSON;
if (IS_FUNCTION(toJSON)) value = toJSON.call(value, key);
}
if (IS_STRING(value)) {
builder.push(%QuoteJSONString(value));
} else if (IS_NUMBER(value)) {
builder.push(($isFinite(value) ? %_NumberToString(value) : "null"));
} else if (IS_BOOLEAN(value)) {
builder.push((value ? "true" : "false"));
} else if (IS_OBJECT(value)) {
// Unwrap value if necessary
if (IS_OBJECT(value)) {
if (IS_NUMBER_WRAPPER(value)) {
value = $Number(value);
} else if (IS_STRING_WRAPPER(value)) {
value = $String(value);
} else if (IS_BOOLEAN_WRAPPER(value)) {
value = %_ValueOf(value);
}
}
switch (typeof value) {
case "string":
return %QuoteJSONString(value);
case "object":
if (!value) {
return "null";
} else if (IS_ARRAY(value)) {
return BasicSerializeArray(value, stack);
builder.push(($isFinite(value) ? %_NumberToString(value) : "null"));
} else if (IS_STRING_WRAPPER(value)) {
builder.push(%QuoteJSONString(%_ValueOf(value)));
} else if (IS_BOOLEAN_WRAPPER(value)) {
builder.push((%_ValueOf(value) ? "true" : "false"));
} else {
return BasicSerializeObject(value, stack);
// Regular non-wrapped object
if (!value) {
builder.push("null");
} else if (IS_ARRAY(value)) {
BasicSerializeArray(value, stack, builder);
} else {
BasicSerializeObject(value, stack, builder);
}
}
case "number":
return $isFinite(value) ? $String(value) : "null";
case "boolean":
return value ? "true" : "false";
}
}
function JSONStringify(value, replacer, space) {
if (IS_UNDEFINED(replacer) && IS_UNDEFINED(space)) {
return BasicJSONSerialize('', {'': value}, []);
var builder = [];
BasicJSONSerialize('', {'': value}, [], builder);
if (builder.length == 0) return;
var result = %_FastAsciiArrayJoin(builder, "");
if (!IS_UNDEFINED(result)) return result;
return %StringBuilderConcat(builder, builder.length, "");
}
if (IS_OBJECT(space)) {
// Unwrap 'space' if it is wrapped