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

test/mjsunit/json.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 299 matching lines @@
 
 TestInvalid('1); throw "foo"; (1');
 
 var x = 0;
 eval("(1); x++; (1)");
 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);

[Rico, 2010/09/01 14:48:20]

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+    } else {
+       expected = "\\u00" + i.toString(16);

[Rico, 2010/09/01 14:48:20]

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+    }
+  } else {
+    expected = string;
+  }  
+  assertEquals('"' + expected + '"', encoded, "Codepoint " + i);
+}