JSBool
js_Stringify(JSContext *cx, jsval *vp, JSObject *replacer,
JSONWriteCallback callback, void *data, uint32 depth)
{
if (depth > JSON_MAX_DEPTH)
return JS_FALSE; /* encoding error */
JSBool ok = JS_TRUE;
JSObject *obj = JSVAL_TO_OBJECT(*vp);
JSBool isArray = JS_IsArrayObject(cx, obj);
jschar output = jschar(isArray ? '[' : '{');
if (!callback(&output, 1, data))
return JS_FALSE;
JSObject *iterObj = NULL;
jsint i = 0;
jsuint length = 0;
if (isArray) {
if (!JS_GetArrayLength(cx, obj, &length))
return JS_FALSE;
} else {
if (!js_ValueToIterator(cx, JSITER_ENUMERATE, vp))
return JS_FALSE;
iterObj = JSVAL_TO_OBJECT(*vp);
}
jsval outputValue = JSVAL_VOID;
JSAutoTempValueRooter tvr(cx, 1, &outputValue);
jsval key;
JSBool memberWritten = JS_FALSE;
do {
outputValue = JSVAL_VOID;
if (isArray) {
if ((jsuint)i >= length)
break;
ok = JS_GetElement(cx, obj, i++, &outputValue);
} else {
ok = js_CallIteratorNext(cx, iterObj, &key);
if (!ok)
break;
if (key == JSVAL_HOLE)
break;
JSString *ks;
if (JSVAL_IS_STRING(key)) {
ks = JSVAL_TO_STRING(key);
} else {
ks = JS_ValueToString(cx, key);
if (!ks) {
ok = JS_FALSE;
break;
}
}
ok = JS_GetUCProperty(cx, obj, JS_GetStringChars(ks),
JS_GetStringLength(ks), &outputValue);
}
if (!ok)
break;
// if this is an array, holes are transmitted as null
if (isArray && outputValue == JSVAL_VOID) {
outputValue = JSVAL_NULL;
} else if (JSVAL_IS_OBJECT(outputValue)) {
ok = js_TryJSON(cx, &outputValue);
if (!ok)
break;
}
// elide undefined values
if (outputValue == JSVAL_VOID)
continue;
// output a comma unless this is the first member to write
if (memberWritten) {
output = jschar(',');
ok = callback(&output, 1, data);
if (!ok)
break;
}
memberWritten = JS_TRUE;
JSType type = JS_TypeOfValue(cx, outputValue);
// Can't encode these types, so drop them
if (type == JSTYPE_FUNCTION || type == JSTYPE_XML)
break;
// Be careful below, this string is weakly rooted.
JSString *s;
// If this isn't an array, we need to output a key
if (!isArray) {
s = JS_ValueToString(cx, key);
if (!s) {
ok = JS_FALSE;
break;
}
ok = write_string(cx, callback, data, JS_GetStringChars(s), JS_GetStringLength(s));
if (!ok)
break;
output = jschar(':');
ok = callback(&output, 1, data);
if (!ok)
break;
}
if (!JSVAL_IS_PRIMITIVE(outputValue)) {
// recurse
ok = js_Stringify(cx, &outputValue, replacer, callback, data, depth + 1);
} else {
JSString *outputString;
s = JS_ValueToString(cx, outputValue);
if (!s) {
ok = JS_FALSE;
break;
}
if (type == JSTYPE_STRING) {
ok = write_string(cx, callback, data, JS_GetStringChars(s), JS_GetStringLength(s));
if (!ok)
break;
continue;
}
if (type == JSTYPE_NUMBER) {
if (JSVAL_IS_DOUBLE(outputValue)) {
jsdouble d = *JSVAL_TO_DOUBLE(outputValue);
if (!JSDOUBLE_IS_FINITE(d))
outputString = JS_NewStringCopyN(cx, "null", 4);
else
outputString = s;
} else {
outputString = s;
}
} else if (type == JSTYPE_BOOLEAN) {
outputString = s;
} else if (JSVAL_IS_NULL(outputValue)) {
outputString = JS_NewStringCopyN(cx, "null", 4);
} else {
ok = JS_FALSE; // encoding error
break;
}
ok = callback(JS_GetStringChars(outputString), JS_GetStringLength(outputString), data);
}
} while (ok);
if (iterObj) {
// Always close the iterator, but make sure not to stomp on OK
js_CloseIteratorState(cx, iterObj);
// encoding error or propagate? FIXME: Bug 408838.
}
if (!ok) {
JS_ReportError(cx, "Error during JSON encoding.");
return JS_FALSE;
}
output = jschar(isArray ? ']' : '}');
ok = callback(&output, 1, data);
return ok;
}
static JSBool
JO(JSContext *cx, jsval *vp, StringifyContext *scx)
{
JSObject *obj = JSVAL_TO_OBJECT(*vp);
if (!scx->cb.append('{'))
return JS_FALSE;
jsval vec[3] = {JSVAL_NULL, JSVAL_NULL, JSVAL_NULL};
JSAutoTempValueRooter tvr(cx, 3, vec);
jsval& key = vec[0];
jsval& outputValue = vec[1];
JSObject *iterObj = NULL;
jsval *keySource = vp;
bool usingWhitelist = false;
// if the replacer is an array, we use the keys from it
if (scx->replacer && JS_IsArrayObject(cx, scx->replacer)) {
usingWhitelist = true;
vec[2] = OBJECT_TO_JSVAL(scx->replacer);
keySource = &vec[2];
}
if (!js_ValueToIterator(cx, JSITER_ENUMERATE, keySource))
return JS_FALSE;
iterObj = JSVAL_TO_OBJECT(*keySource);
JSBool memberWritten = JS_FALSE;
bool ok = false;
while (true) {
outputValue = JSVAL_VOID;
if (!js_CallIteratorNext(cx, iterObj, &key))
goto error_break;
if (key == JSVAL_HOLE)
break;
jsuint index = 0;
if (usingWhitelist) {
// skip non-index properties
if (!js_IdIsIndex(key, &index))
continue;
jsval newKey;
if (!scx->replacer->getProperty(cx, key, &newKey))
goto error_break;
key = newKey;
}
JSString *ks;
if (JSVAL_IS_STRING(key)) {
ks = JSVAL_TO_STRING(key);
} else {
ks = js_ValueToString(cx, key);
if (!ks)
goto error_break;
}
JSAutoTempValueRooter keyStringRoot(cx, ks);
// Don't include prototype properties, since this operation is
// supposed to be implemented as if by ES3.1 Object.keys()
jsid id;
jsval v = JS_FALSE;
if (!js_ValueToStringId(cx, STRING_TO_JSVAL(ks), &id) ||
!js_HasOwnProperty(cx, obj->map->ops->lookupProperty, obj, id, &v)) {
goto error_break;
}
if (v != JSVAL_TRUE)
continue;
if (!JS_GetPropertyById(cx, obj, id, &outputValue))
goto error_break;
if (JSVAL_IS_OBJECT(outputValue) && !js_TryJSON(cx, &outputValue))
goto error_break;
// call this here, so we don't write out keys if the replacer function
// wants to elide the value.
if (!CallReplacerFunction(cx, id, obj, scx, &outputValue))
goto error_break;
JSType type = JS_TypeOfValue(cx, outputValue);
// elide undefined values and functions and XML
if (outputValue == JSVAL_VOID || type == JSTYPE_FUNCTION || type == JSTYPE_XML)
continue;
// output a comma unless this is the first member to write
if (memberWritten && !scx->cb.append(','))
goto error_break;
memberWritten = JS_TRUE;
if (!WriteIndent(cx, scx, scx->depth))
goto error_break;
// Be careful below, this string is weakly rooted
JSString *s = js_ValueToString(cx, key);
if (!s)
goto error_break;
const jschar *chars;
size_t length;
s->getCharsAndLength(chars, length);
if (!write_string(cx, scx->cb, chars, length) ||
!scx->cb.append(':') ||
!Str(cx, id, obj, scx, &outputValue, false)) {
goto error_break;
}
}
ok = true;
error_break:
if (iterObj) {
// Always close the iterator, but make sure not to stomp on OK
JS_ASSERT(OBJECT_TO_JSVAL(iterObj) == *keySource);
ok &= js_CloseIterator(cx, *keySource);
}
if (!ok)
return JS_FALSE;
if (memberWritten && !WriteIndent(cx, scx, scx->depth - 1))
return JS_FALSE;
return scx->cb.append('}');
}
