Correctly wrap uri.js into a function.

src/uri.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-"use strict";
-
-// This file relies on the fact that the following declaration has been made
-// in runtime.js:
-// var $Array = global.Array;
-
-// -------------------------------------------------------------------
-
 // This file contains support for URI manipulations written in
 // JavaScript.
 
-
 (function() {
 
-  // -------------------------------------------------------------------
-  // Define internal helper functions.
-
-  function HexValueOf(code) {
-    // 0-9
-    if (code >= 48 && code <= 57) return code - 48;
-    // A-F
-    if (code >= 65 && code <= 70) return code - 55;
-    // a-f
-    if (code >= 97 && code <= 102) return code - 87;
-
-    return -1;
-  }
-
-  // Does the char code correspond to an alpha-numeric char.
-  function isAlphaNumeric(cc) {
-    // a - z
-    if (97 <= cc && cc <= 122) return true;
-    // A - Z
-    if (65 <= cc && cc <= 90) return true;
-    // 0 - 9
-    if (48 <= cc && cc <= 57) return true;
-
-    return false;
-  }
-
-  //Lazily initialized.
-  var hexCharCodeArray = 0;
-
-  function URIAddEncodedOctetToBuffer(octet, result, index) {
-    result[index++] = 37; // Char code of '%'.
-    result[index++] = hexCharCodeArray[octet >> 4];
-    result[index++] = hexCharCodeArray[octet & 0x0F];
-    return index;
-  }
-
-  function URIEncodeOctets(octets, result, index) {
-    if (hexCharCodeArray === 0) {
-      hexCharCodeArray = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-                          65, 66, 67, 68, 69, 70];
-    }
-    index = URIAddEncodedOctetToBuffer(octets[0], result, index);
-    if (octets[1]) index = URIAddEncodedOctetToBuffer(octets[1], result, index);
-    if (octets[2]) index = URIAddEncodedOctetToBuffer(octets[2], result, index);
-    if (octets[3]) index = URIAddEncodedOctetToBuffer(octets[3], result, index);
-    return index;
-  }
-
-  function URIEncodeSingle(cc, result, index) {
-    var x = (cc >> 12) & 0xF;
-    var y = (cc >> 6) & 63;
-    var z = cc & 63;
-    var octets = new $Array(3);
-    if (cc <= 0x007F) {
-      octets[0] = cc;
-    } else if (cc <= 0x07FF) {
-      octets[0] = y + 192;
-      octets[1] = z + 128;
+"use strict";
+
+%CheckIsBootstrapping();
+
+var GlobalObject = global.Object;
+var GlobalArray = global.Array;
+
+// -------------------------------------------------------------------
+// Define internal helper functions.
+
+function HexValueOf(code) {
+  // 0-9
+  if (code >= 48 && code <= 57) return code - 48;
+  // A-F
+  if (code >= 65 && code <= 70) return code - 55;
+  // a-f
+  if (code >= 97 && code <= 102) return code - 87;
+
+  return -1;
+}
+
+// Does the char code correspond to an alpha-numeric char.
+function isAlphaNumeric(cc) {
+  // a - z
+  if (97 <= cc && cc <= 122) return true;
+  // A - Z
+  if (65 <= cc && cc <= 90) return true;
+  // 0 - 9
+  if (48 <= cc && cc <= 57) return true;
+
+  return false;
+}
+
+//Lazily initialized.
+var hexCharCodeArray = 0;
+
+function URIAddEncodedOctetToBuffer(octet, result, index) {
+  result[index++] = 37; // Char code of '%'.
+  result[index++] = hexCharCodeArray[octet >> 4];
+  result[index++] = hexCharCodeArray[octet & 0x0F];
+  return index;
+}
+
+function URIEncodeOctets(octets, result, index) {
+  if (hexCharCodeArray === 0) {
+    hexCharCodeArray = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
+                        65, 66, 67, 68, 69, 70];
+  }
+  index = URIAddEncodedOctetToBuffer(octets[0], result, index);
+  if (octets[1]) index = URIAddEncodedOctetToBuffer(octets[1], result, index);
+  if (octets[2]) index = URIAddEncodedOctetToBuffer(octets[2], result, index);
+  if (octets[3]) index = URIAddEncodedOctetToBuffer(octets[3], result, index);
+  return index;
+}
+
+function URIEncodeSingle(cc, result, index) {
+  var x = (cc >> 12) & 0xF;
+  var y = (cc >> 6) & 63;
+  var z = cc & 63;
+  var octets = new GlobalArray(3);
+  if (cc <= 0x007F) {
+    octets[0] = cc;
+  } else if (cc <= 0x07FF) {
+    octets[0] = y + 192;
+    octets[1] = z + 128;
+  } else {
+    octets[0] = x + 224;
+    octets[1] = y + 128;
+    octets[2] = z + 128;
+  }
+  return URIEncodeOctets(octets, result, index);
+}
+
+function URIEncodePair(cc1 , cc2, result, index) {
+  var u = ((cc1 >> 6) & 0xF) + 1;
+  var w = (cc1 >> 2) & 0xF;
+  var x = cc1 & 3;
+  var y = (cc2 >> 6) & 0xF;
+  var z = cc2 & 63;
+  var octets = new GlobalArray(4);
+  octets[0] = (u >> 2) + 240;
+  octets[1] = (((u & 3) << 4) | w) + 128;
+  octets[2] = ((x << 4) | y) + 128;
+  octets[3] = z + 128;
+  return URIEncodeOctets(octets, result, index);
+}
+
+function URIHexCharsToCharCode(highChar, lowChar) {
+  var highCode = HexValueOf(highChar);
+  var lowCode = HexValueOf(lowChar);
+  if (highCode == -1 || lowCode == -1) {
+    throw new $URIError("URI malformed");
+  }
+  return (highCode << 4) | lowCode;
+}
+
+// Callers must ensure that |result| is a sufficiently long sequential
+// two-byte string!
+function URIDecodeOctets(octets, result, index) {
+  var value;
+  var o0 = octets[0];
+  if (o0 < 0x80) {
+    value = o0;
+  } else if (o0 < 0xc2) {
+    throw new $URIError("URI malformed");
+  } else {
+    var o1 = octets[1];
+    if (o0 < 0xe0) {
+      var a = o0 & 0x1f;
+      if ((o1 < 0x80) || (o1 > 0xbf)) {
+        throw new $URIError("URI malformed");
+      }
+      var b = o1 & 0x3f;
+      value = (a << 6) + b;
+      if (value < 0x80 || value > 0x7ff) {
+        throw new $URIError("URI malformed");
+      }
     } else {
-      octets[0] = x + 224;
-      octets[1] = y + 128;
-      octets[2] = z + 128;
-    }
-    return URIEncodeOctets(octets, result, index);
-  }
-
-  function URIEncodePair(cc1 , cc2, result, index) {
-    var u = ((cc1 >> 6) & 0xF) + 1;
-    var w = (cc1 >> 2) & 0xF;
-    var x = cc1 & 3;
-    var y = (cc2 >> 6) & 0xF;
-    var z = cc2 & 63;
-    var octets = new $Array(4);
-    octets[0] = (u >> 2) + 240;
-    octets[1] = (((u & 3) << 4) | w) + 128;
-    octets[2] = ((x << 4) | y) + 128;
-    octets[3] = z + 128;
-    return URIEncodeOctets(octets, result, index);
-  }
-
-  function URIHexCharsToCharCode(highChar, lowChar) {
-    var highCode = HexValueOf(highChar);
-    var lowCode = HexValueOf(lowChar);
-    if (highCode == -1 || lowCode == -1) {
-      throw new $URIError("URI malformed");
-    }
-    return (highCode << 4) | lowCode;
-  }
-
-  // Callers must ensure that |result| is a sufficiently long sequential
-  // two-byte string!
-  function URIDecodeOctets(octets, result, index) {
-    var value;
-    var o0 = octets[0];
-    if (o0 < 0x80) {
-      value = o0;
-    } else if (o0 < 0xc2) {
-      throw new $URIError("URI malformed");
-    } else {
-      var o1 = octets[1];
-      if (o0 < 0xe0) {
-        var a = o0 & 0x1f;
+      var o2 = octets[2];
+      if (o0 < 0xf0) {
+        var a = o0 & 0x0f;
         if ((o1 < 0x80) || (o1 > 0xbf)) {
           throw new $URIError("URI malformed");
         }
         var b = o1 & 0x3f;
-        value = (a << 6) + b;
-        if (value < 0x80 || value > 0x7ff) {
+        if ((o2 < 0x80) || (o2 > 0xbf)) {
           throw new $URIError("URI malformed");
         }
+        var c = o2 & 0x3f;
+        value = (a << 12) + (b << 6) + c;
+        if ((value < 0x800) || (value > 0xffff)) {
+          throw new $URIError("URI malformed");
+        }
       } else {
-        var o2 = octets[2];
-        if (o0 < 0xf0) {
-          var a = o0 & 0x0f;
+        var o3 = octets[3];
+        if (o0 < 0xf8) {
+          var a = (o0 & 0x07);
           if ((o1 < 0x80) || (o1 > 0xbf)) {
             throw new $URIError("URI malformed");
           }
-          var b = o1 & 0x3f;
+          var b = (o1 & 0x3f);
           if ((o2 < 0x80) || (o2 > 0xbf)) {
             throw new $URIError("URI malformed");
           }
-          var c = o2 & 0x3f;
-          value = (a << 12) + (b << 6) + c;
-          if ((value < 0x800) || (value > 0xffff)) {
+          var c = (o2 & 0x3f);
+          if ((o3 < 0x80) || (o3 > 0xbf)) {
+            throw new $URIError("URI malformed");
+          }
+          var d = (o3 & 0x3f);
+          value = (a << 18) + (b << 12) + (c << 6) + d;
+          if ((value < 0x10000) || (value > 0x10ffff)) {
             throw new $URIError("URI malformed");
           }
         } else {
-          var o3 = octets[3];
-          if (o0 < 0xf8) {
-            var a = (o0 & 0x07);
-            if ((o1 < 0x80) || (o1 > 0xbf)) {
-              throw new $URIError("URI malformed");
-            }
-            var b = (o1 & 0x3f);
-            if ((o2 < 0x80) || (o2 > 0xbf)) {
-              throw new $URIError("URI malformed");
-            }
-            var c = (o2 & 0x3f);
-            if ((o3 < 0x80) || (o3 > 0xbf)) {
-              throw new $URIError("URI malformed");
-            }
-            var d = (o3 & 0x3f);
-            value = (a << 18) + (b << 12) + (c << 6) + d;
-            if ((value < 0x10000) || (value > 0x10ffff)) {
-              throw new $URIError("URI malformed");
-            }
-          } else {
-            throw new $URIError("URI malformed");
-          }
+          throw new $URIError("URI malformed");
         }
       }
     }
-    if (0xD800 <= value && value <= 0xDFFF) {
-      throw new $URIError("URI malformed");
+  }
+  if (0xD800 <= value && value <= 0xDFFF) {
+    throw new $URIError("URI malformed");
+  }
+  if (value < 0x10000) {
+    %_TwoByteSeqStringSetChar(index++, value, result);
+  } else {
+    %_TwoByteSeqStringSetChar(index++, (value >> 10) + 0xd7c0, result);
+    %_TwoByteSeqStringSetChar(index++, (value & 0x3ff) + 0xdc00, result);
+  }
+  return index;
+}
+
+// ECMA-262, section 15.1.3
+function Encode(uri, unescape) {
+  var uriLength = uri.length;
+  var array = new InternalArray(uriLength);
+  var index = 0;
+  for (var k = 0; k < uriLength; k++) {
+    var cc1 = uri.charCodeAt(k);
+    if (unescape(cc1)) {
+      array[index++] = cc1;
+    } else {
+      if (cc1 >= 0xDC00 && cc1 <= 0xDFFF) throw new $URIError("URI malformed");
+      if (cc1 < 0xD800 || cc1 > 0xDBFF) {
+        index = URIEncodeSingle(cc1, array, index);
+      } else {
+        k++;
+        if (k == uriLength) throw new $URIError("URI malformed");
+        var cc2 = uri.charCodeAt(k);
+        if (cc2 < 0xDC00 || cc2 > 0xDFFF) throw new $URIError("URI malformed");
+        index = URIEncodePair(cc1, cc2, array, index);
+      }
     }
-    if (value < 0x10000) {
-      %_TwoByteSeqStringSetChar(index++, value, result);
+  }
+
+  var result = %NewString(array.length, NEW_ONE_BYTE_STRING);
+  for (var i = 0; i < array.length; i++) {
+    %_OneByteSeqStringSetChar(i, array[i], result);
+  }
+  return result;
+}
+
+// ECMA-262, section 15.1.3
+function Decode(uri, reserved) {
+  var uriLength = uri.length;
+  var one_byte = %NewString(uriLength, NEW_ONE_BYTE_STRING);
+  var index = 0;
+  var k = 0;
+
+  // Optimistically assume one-byte string.
+  for ( ; k < uriLength; k++) {
+    var code = uri.charCodeAt(k);
+    if (code == 37) {  // '%'
+      if (k + 2 >= uriLength) throw new $URIError("URI malformed");
+      var cc = URIHexCharsToCharCode(uri.charCodeAt(k+1), uri.charCodeAt(k+2));
+      if (cc >> 7) break;  // Assumption wrong, two-byte string.
+      if (reserved(cc)) {
+        %_OneByteSeqStringSetChar(index++, 37, one_byte);  // '%'.
+        %_OneByteSeqStringSetChar(index++, uri.charCodeAt(k+1), one_byte);
+        %_OneByteSeqStringSetChar(index++, uri.charCodeAt(k+2), one_byte);
+      } else {
+        %_OneByteSeqStringSetChar(index++, cc, one_byte);
+      }
+      k += 2;
     } else {
-      %_TwoByteSeqStringSetChar(index++, (value >> 10) + 0xd7c0, result);
-      %_TwoByteSeqStringSetChar(index++, (value & 0x3ff) + 0xdc00, result);
+      if (code > 0x7f) break;  // Assumption wrong, two-byte string.
+      %_OneByteSeqStringSetChar(index++, code, one_byte);
     }
-    return index;
-  }
-
-  // ECMA-262, section 15.1.3
-  function Encode(uri, unescape) {
-    var uriLength = uri.length;
-    var array = new InternalArray(uriLength);
-    var index = 0;
-    for (var k = 0; k < uriLength; k++) {
-      var cc1 = uri.charCodeAt(k);
-      if (unescape(cc1)) {
-        array[index++] = cc1;
+  }
+
+  one_byte = %TruncateString(one_byte, index);
+  if (k == uriLength) return one_byte;
+
+  // Write into two byte string.
+  var two_byte = %NewString(uriLength - k, NEW_TWO_BYTE_STRING);
+  index = 0;
+
+  for ( ; k < uriLength; k++) {
+    var code = uri.charCodeAt(k);
+    if (code == 37) {  // '%'
+      if (k + 2 >= uriLength) throw new $URIError("URI malformed");
+      var cc = URIHexCharsToCharCode(uri.charCodeAt(++k), uri.charCodeAt(++k));
+      if (cc >> 7) {
+        var n = 0;
+        while (((cc << ++n) & 0x80) != 0) { }
+        if (n == 1 || n > 4) throw new $URIError("URI malformed");
+        var octets = new GlobalArray(n);
+        octets[0] = cc;
+        if (k + 3 * (n - 1) >= uriLength) throw new $URIError("URI malformed");
+        for (var i = 1; i < n; i++) {
+          if (uri.charAt(++k) != '%') throw new $URIError("URI malformed");
+          octets[i] = URIHexCharsToCharCode(uri.charCodeAt(++k),
+                                            uri.charCodeAt(++k));
+        }
+        index = URIDecodeOctets(octets, two_byte, index);
+      } else  if (reserved(cc)) {
+        %_TwoByteSeqStringSetChar(index++, 37, two_byte);  // '%'.
+        %_TwoByteSeqStringSetChar(index++, uri.charCodeAt(k - 1), two_byte);
+        %_TwoByteSeqStringSetChar(index++, uri.charCodeAt(k), two_byte);
       } else {
-        if (cc1 >= 0xDC00 && cc1 <= 0xDFFF) throw new $URIError("URI malformed");
-        if (cc1 < 0xD800 || cc1 > 0xDBFF) {
-          index = URIEncodeSingle(cc1, array, index);
-        } else {
-          k++;
-          if (k == uriLength) throw new $URIError("URI malformed");
-          var cc2 = uri.charCodeAt(k);
-          if (cc2 < 0xDC00 || cc2 > 0xDFFF) throw new $URIError("URI malformed");
-          index = URIEncodePair(cc1, cc2, array, index);
-        }
-      }
+        %_TwoByteSeqStringSetChar(index++, cc, two_byte);
+      }
+    } else {
+      %_TwoByteSeqStringSetChar(index++, code, two_byte);
     }
-
-    var result = %NewString(array.length, NEW_ONE_BYTE_STRING);
-    for (var i = 0; i < array.length; i++) {
-      %_OneByteSeqStringSetChar(i, array[i], result);
-    }
-    return result;
-  }
-
-  // ECMA-262, section 15.1.3
-  function Decode(uri, reserved) {
-    var uriLength = uri.length;
-    var one_byte = %NewString(uriLength, NEW_ONE_BYTE_STRING);
-    var index = 0;
-    var k = 0;
-
-    // Optimistically assume one-byte string.
-    for ( ; k < uriLength; k++) {
-      var code = uri.charCodeAt(k);
-      if (code == 37) {  // '%'
-        if (k + 2 >= uriLength) throw new $URIError("URI malformed");
-        var cc = URIHexCharsToCharCode(uri.charCodeAt(k+1), uri.charCodeAt(k+2));
-        if (cc >> 7) break;  // Assumption wrong, two-byte string.
-        if (reserved(cc)) {
-          %_OneByteSeqStringSetChar(index++, 37, one_byte);  // '%'.
-          %_OneByteSeqStringSetChar(index++, uri.charCodeAt(k+1), one_byte);
-          %_OneByteSeqStringSetChar(index++, uri.charCodeAt(k+2), one_byte);
-        } else {
-          %_OneByteSeqStringSetChar(index++, cc, one_byte);
-        }
-        k += 2;
-      } else {
-        if (code > 0x7f) break;  // Assumption wrong, two-byte string.
-        %_OneByteSeqStringSetChar(index++, code, one_byte);
-      }
-    }
-
-    one_byte = %TruncateString(one_byte, index);
-    if (k == uriLength) return one_byte;
-
-    // Write into two byte string.
-    var two_byte = %NewString(uriLength - k, NEW_TWO_BYTE_STRING);
-    index = 0;
-
-    for ( ; k < uriLength; k++) {
-      var code = uri.charCodeAt(k);
-      if (code == 37) {  // '%'
-        if (k + 2 >= uriLength) throw new $URIError("URI malformed");
-        var cc = URIHexCharsToCharCode(uri.charCodeAt(++k), uri.charCodeAt(++k));
-        if (cc >> 7) {
-          var n = 0;
-          while (((cc << ++n) & 0x80) != 0) { }
-          if (n == 1 || n > 4) throw new $URIError("URI malformed");
-          var octets = new $Array(n);
-          octets[0] = cc;
-          if (k + 3 * (n - 1) >= uriLength) throw new $URIError("URI malformed");
-          for (var i = 1; i < n; i++) {
-            if (uri.charAt(++k) != '%') throw new $URIError("URI malformed");
-            octets[i] = URIHexCharsToCharCode(uri.charCodeAt(++k),
-                                              uri.charCodeAt(++k));
-          }
-          index = URIDecodeOctets(octets, two_byte, index);
-        } else  if (reserved(cc)) {
-          %_TwoByteSeqStringSetChar(index++, 37, two_byte);  // '%'.
-          %_TwoByteSeqStringSetChar(index++, uri.charCodeAt(k - 1), two_byte);
-          %_TwoByteSeqStringSetChar(index++, uri.charCodeAt(k), two_byte);
-        } else {
-          %_TwoByteSeqStringSetChar(index++, cc, two_byte);
-        }
-      } else {
-        %_TwoByteSeqStringSetChar(index++, code, two_byte);
-      }
-    }
-
-    two_byte = %TruncateString(two_byte, index);
-    return one_byte + two_byte;
-  }
-
-  // -------------------------------------------------------------------
-  // Define exported functions.
-
-  // ECMA-262 - B.2.1.
-  function URIEscapeJS(str) {
-    var s = ToString(str);
-    return %URIEscape(s);
-  }
-
-  // ECMA-262 - B.2.2.
-  function URIUnescapeJS(str) {
-    var s = ToString(str);
-    return %URIUnescape(s);
-  }
-
-  // ECMA-262 - 15.1.3.1.
-  function URIDecode(uri) {
-    var reservedPredicate = function(cc) {
-      // #$
-      if (35 <= cc && cc <= 36) return true;
-      // &
-      if (cc == 38) return true;
-      // +,
-      if (43 <= cc && cc <= 44) return true;
-      // /
-      if (cc == 47) return true;
-      // :;
-      if (58 <= cc && cc <= 59) return true;
-      // =
-      if (cc == 61) return true;
-      // ?@
-      if (63 <= cc && cc <= 64) return true;
-
-      return false;
-    };
-    var string = ToString(uri);
-    return Decode(string, reservedPredicate);
-  }
-
-  // ECMA-262 - 15.1.3.2.
-  function URIDecodeComponent(component) {
-    var reservedPredicate = function(cc) { return false; };
-    var string = ToString(component);
-    return Decode(string, reservedPredicate);
-  }
-
-  // ECMA-262 - 15.1.3.3.
-  function URIEncode(uri) {
-    var unescapePredicate = function(cc) {
-      if (isAlphaNumeric(cc)) return true;
-      // !
-      if (cc == 33) return true;
-      // #$
-      if (35 <= cc && cc <= 36) return true;
-      // &'()*+,-./
-      if (38 <= cc && cc <= 47) return true;
-      // :;
-      if (58 <= cc && cc <= 59) return true;
-      // =
-      if (cc == 61) return true;
-      // ?@
-      if (63 <= cc && cc <= 64) return true;
-      // _
-      if (cc == 95) return true;
-      // ~
-      if (cc == 126) return true;
-
-      return false;
-    };
-    var string = ToString(uri);
-    return Encode(string, unescapePredicate);
-  }
-
-  // ECMA-262 - 15.1.3.4
-  function URIEncodeComponent(component) {
-    var unescapePredicate = function(cc) {
-      if (isAlphaNumeric(cc)) return true;
-      // !
-      if (cc == 33) return true;
-      // '()*
-      if (39 <= cc && cc <= 42) return true;
-      // -.
-      if (45 <= cc && cc <= 46) return true;
-      // _
-      if (cc == 95) return true;
-      // ~
-      if (cc == 126) return true;
-
-      return false;
-    };
-    var string = ToString(component);
-    return Encode(string, unescapePredicate);
-  }
-
-  // -------------------------------------------------------------------
-  // Install exported functions.
-
-  %CheckIsBootstrapping();
-
-  // Set up non-enumerable URI functions on the global object and set
-  // their names.
-  InstallFunctions(global, DONT_ENUM, $Array(
-      "escape", URIEscapeJS,
-      "unescape", URIUnescapeJS,
-      "decodeURI", URIDecode,
-      "decodeURIComponent", URIDecodeComponent,
-      "encodeURI", URIEncode,
-      "encodeURIComponent", URIEncodeComponent
-  ));
+  }
+
+  two_byte = %TruncateString(two_byte, index);
+  return one_byte + two_byte;
+}
+
+// -------------------------------------------------------------------
+// Define exported functions.
+
+// ECMA-262 - B.2.1.
+function URIEscapeJS(str) {
+  var s = ToString(str);
+  return %URIEscape(s);
+}
+
+// ECMA-262 - B.2.2.
+function URIUnescapeJS(str) {
+  var s = ToString(str);
+  return %URIUnescape(s);
+}
+
+// ECMA-262 - 15.1.3.1.
+function URIDecode(uri) {
+  var reservedPredicate = function(cc) {
+    // #$
+    if (35 <= cc && cc <= 36) return true;
+    // &
+    if (cc == 38) return true;
+    // +,
+    if (43 <= cc && cc <= 44) return true;
+    // /
+    if (cc == 47) return true;
+    // :;
+    if (58 <= cc && cc <= 59) return true;
+    // =
+    if (cc == 61) return true;
+    // ?@
+    if (63 <= cc && cc <= 64) return true;
+
+    return false;
+  };
+  var string = ToString(uri);
+  return Decode(string, reservedPredicate);
+}
+
+// ECMA-262 - 15.1.3.2.
+function URIDecodeComponent(component) {
+  var reservedPredicate = function(cc) { return false; };
+  var string = ToString(component);
+  return Decode(string, reservedPredicate);
+}
+
+// ECMA-262 - 15.1.3.3.
+function URIEncode(uri) {
+  var unescapePredicate = function(cc) {
+    if (isAlphaNumeric(cc)) return true;
+    // !
+    if (cc == 33) return true;
+    // #$
+    if (35 <= cc && cc <= 36) return true;
+    // &'()*+,-./
+    if (38 <= cc && cc <= 47) return true;
+    // :;
+    if (58 <= cc && cc <= 59) return true;
+    // =
+    if (cc == 61) return true;
+    // ?@
+    if (63 <= cc && cc <= 64) return true;
+    // _
+    if (cc == 95) return true;
+    // ~
+    if (cc == 126) return true;
+
+    return false;
+  };
+  var string = ToString(uri);
+  return Encode(string, unescapePredicate);
+}
+
+// ECMA-262 - 15.1.3.4
+function URIEncodeComponent(component) {
+  var unescapePredicate = function(cc) {
+    if (isAlphaNumeric(cc)) return true;
+    // !
+    if (cc == 33) return true;
+    // '()*
+    if (39 <= cc && cc <= 42) return true;
+    // -.
+    if (45 <= cc && cc <= 46) return true;
+    // _
+    if (cc == 95) return true;
+    // ~
+    if (cc == 126) return true;
+
+    return false;
+  };
+  var string = ToString(component);
+  return Encode(string, unescapePredicate);
+}
+
+// -------------------------------------------------------------------
+// Install exported functions.
+
+// Set up non-enumerable URI functions on the global object and set
+// their names.
+InstallFunctions(global, DONT_ENUM, GlobalArray(
+    "escape", URIEscapeJS,
+    "unescape", URIUnescapeJS,
+    "decodeURI", URIDecode,
+    "decodeURIComponent", URIDecodeComponent,
+    "encodeURI", URIEncode,
+    "encodeURIComponent", URIEncodeComponent
+));
 
 })();