Global object unescape routine

JerryScript-DCO-1.0-Signed-off-by: Szilard Ledan szledan.u-szeged@partner.samsung.com

tests/jerry/global-escaping.js

@@ -28,4 +28,33 @@ assert (escape("\x80\x95\xaf\xfe\xff") === "%80%95%AF%FE%FF");
 assert (escape("\u0100\ud800\udc00") === "%u0100%uD800%uDC00");
 
 assert (escape({}) === "%5Bobject%20Object%5D");
-assert (escape(true) === "true")
+assert (escape(true) === "true");
+
+// Unescaping
+
+assert (unescape ("%00%01%02%03%04%05%06%07%08%09%0A%0B%0C%0D%0E%0F") ===
+        "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f");
+assert (unescape("%10%11%12%13%14%15%16%17%18%19%1A%1B%1C%1D%1E%1F") ===
+        "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f");
+assert (unescape("%20%21%22%23%24%25%26%27%28%29*+%2C-./0123456789%3A%3B%3C%3D%3E%3F@ABCDEFGHIJKLMN") ===
+        " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMN");
+assert (unescape("OPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7F") ===
+        "OPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}\x7F");
+assert (unescape("%80%95%AF%FE%FF") === "\x80\x95\xaf\xfe\xff");
+assert (unescape("%ud800") === "\ud800");
+assert (unescape("\ud800") === "\ud800");
+assert (unescape("\ud800\udc00") === "\ud800\udc00");
+assert (unescape("%ud800%udc00") === "\ud800\udc00");
+assert (unescape("\ud800%udc00") === "\ud800\udc00");
+assert (unescape("%ud800\udc00") === "\ud800\udc00");
+
+assert (unescape({}) === "[object Object]");
+assert (unescape(true) === "true")
+assert (unescape() === "undefined");
+assert (unescape(1985) === "1985");
+assert (unescape("%5#%uu") === "%5#%uu");
+
+// Inversion
+
+var str = "\u0001\u0000\uFFFF";
+assert (unescape(escape(str)) === str);