Make JSON.stringify not quote non-ASCII characters. Fix bug 855.

Review URL: http://codereview.chromium.org/3336001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5398 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/json.js

@@ -68,15 +68,13 @@ function JSONParse(text, reviver) {
 }
 
 var characterQuoteCache = {
+  '\b': '\\b',  // ASCII 8, Backspace
+  '\t': '\\t',  // ASCII 9, Tab
+  '\n': '\\n',  // ASCII 10, Newline
+  '\f': '\\f',  // ASCII 12, Formfeed
+  '\r': '\\r',  // ASCII 13, Carriage Return
   '\"': '\\"',
-  '\\': '\\\\',
-  '/': '\\/',
-  '\b': '\\b',
-  '\f': '\\f',
-  '\n': '\\n',
-  '\r': '\\r',
-  '\t': '\\t',
-  '\x0B': '\\u000b'
+  '/': '\\/'
 };
 
 function QuoteSingleJSONCharacter(c) {
@@ -95,7 +93,7 @@ function QuoteSingleJSONCharacter(c) {
 }
 
 function QuoteJSONString(str) {
-  var quotable = /[\\\"\x00-\x1f\x80-\uffff]/g;
+  var quotable = /[\\\"\x00-\x1f]/g;
   return '"' + str.replace(quotable, QuoteSingleJSONCharacter) + '"';
 }
 

test/mjsunit/json.js

@@ -317,3 +317,32 @@ TestInvalid('1); x++; (1');
 // Test string conversion of argument.
 var o = { toString: function() { return "42"; } };
 assertEquals(42, JSON.parse(o));
+
+
+for (var i = 0; i < 65536; i++) {
+  var string = String.fromCharCode(i);
+  var encoded = JSON.stringify(string);
+  var expected = "uninitialized";
+  // Following the ES5 specification of the abstraction function Quote.
+  if (string == '"' || string == '\\') {
+    // Step 2.a
+    expected = '\\' + string;
+  } else if ("\b\t\n\r\f".indexOf(string) >= 0) {
+    // Step 2.b 
+    if (string == '\b') expected = '\\b';
+    else if (string == '\t') expected = '\\t';
+    else if (string == '\n') expected = '\\n';
+    else if (string == '\f') expected = '\\f';
+    else if (string == '\r') expected = '\\r';
+  } else if (i < 32) {
+    // Step 2.c
+    if (i < 16) {
+      expected = "\\u000" + i.toString(16);
+    } else {
+      expected = "\\u00" + i.toString(16);
+    }
+  } else {
+    expected = string;
+  }  
+  assertEquals('"' + expected + '"', encoded, "Codepoint " + i);
+}