Rewrite decodeURL as builtin function, remove now unused runtime functions.

src/js/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.
 
 // This file contains support for URI manipulations written in
 // JavaScript.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
-//- ------------------------------------------------------------------
-// Imports
-
-var GlobalObject = global.Object;
-var InternalArray = utils.InternalArray;
-var MakeURIError;
-
-utils.Import(function(from) {
-  MakeURIError = from.MakeURIError;
-});
-
-
-// -------------------------------------------------------------------
-// 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;
-}
-
-function URIHexCharsToCharCode(highChar, lowChar) {
-  var highCode = HexValueOf(highChar);
-  var lowCode = HexValueOf(lowChar);
-  if (highCode == -1 || lowCode == -1) throw MakeURIError();
-  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 MakeURIError();
-  } else {
-    var o1 = octets[1];
-    if (o0 < 0xe0) {
-      var a = o0 & 0x1f;
-      if ((o1 < 0x80) || (o1 > 0xbf)) throw MakeURIError();
-      var b = o1 & 0x3f;
-      value = (a << 6) + b;
-      if (value < 0x80 || value > 0x7ff) throw MakeURIError();
-    } else {
-      var o2 = octets[2];
-      if (o0 < 0xf0) {
-        var a = o0 & 0x0f;
-        if ((o1 < 0x80) || (o1 > 0xbf)) throw MakeURIError();
-        var b = o1 & 0x3f;
-        if ((o2 < 0x80) || (o2 > 0xbf)) throw MakeURIError();
-        var c = o2 & 0x3f;
-        value = (a << 12) + (b << 6) + c;
-        if ((value < 0x800) || (value > 0xffff)) throw MakeURIError();
-      } else {
-        var o3 = octets[3];
-        if (o0 < 0xf8) {
-          var a = (o0 & 0x07);
-          if ((o1 < 0x80) || (o1 > 0xbf)) throw MakeURIError();
-          var b = (o1 & 0x3f);
-          if ((o2 < 0x80) || (o2 > 0xbf)) {
-            throw MakeURIError();
-          }
-          var c = (o2 & 0x3f);
-          if ((o3 < 0x80) || (o3 > 0xbf)) throw MakeURIError();
-          var d = (o3 & 0x3f);
-          value = (a << 18) + (b << 12) + (c << 6) + d;
-          if ((value < 0x10000) || (value > 0x10ffff)) throw MakeURIError();
-        } else {
-          throw MakeURIError();
-        }
-      }
-    }
-  }
-  if (0xD800 <= value && value <= 0xDFFF) throw MakeURIError();
-  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 Decode(uri, reserved) {
-  uri = TO_STRING(uri);
-  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 = %_StringCharCodeAt(uri, k);
-    if (code == 37) {  // '%'
-      if (k + 2 >= uriLength) throw MakeURIError();
-      var cc = URIHexCharsToCharCode(%_StringCharCodeAt(uri, k+1),
-                                     %_StringCharCodeAt(uri, k+2));
-      if (cc >> 7) break;  // Assumption wrong, two-byte string.
-      if (reserved(cc)) {
-        %_OneByteSeqStringSetChar(index++, 37, one_byte);  // '%'.
-        %_OneByteSeqStringSetChar(index++, %_StringCharCodeAt(uri, k+1),
-                                  one_byte);
-        %_OneByteSeqStringSetChar(index++, %_StringCharCodeAt(uri, 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 = %_StringCharCodeAt(uri, k);
-    if (code == 37) {  // '%'
-      if (k + 2 >= uriLength) throw MakeURIError();
-      var cc = URIHexCharsToCharCode(%_StringCharCodeAt(uri, ++k),
-                                     %_StringCharCodeAt(uri, ++k));
-      if (cc >> 7) {
-        var n = 0;
-        while (((cc << ++n) & 0x80) != 0) { }
-        if (n == 1 || n > 4) throw MakeURIError();
-        var octets = new InternalArray(n);
-        octets[0] = cc;
-        if (k + 3 * (n - 1) >= uriLength) throw MakeURIError();
-        for (var i = 1; i < n; i++) {
-          if (uri[++k] != '%') throw MakeURIError();
-          octets[i] = URIHexCharsToCharCode(%_StringCharCodeAt(uri, ++k),
-                                            %_StringCharCodeAt(uri, ++k));
-        }
-        index = URIDecodeOctets(octets, two_byte, index);
-      } else  if (reserved(cc)) {
-        %_TwoByteSeqStringSetChar(index++, 37, two_byte);  // '%'.
-        %_TwoByteSeqStringSetChar(index++, %_StringCharCodeAt(uri, k - 1),
-                                  two_byte);
-        %_TwoByteSeqStringSetChar(index++, %_StringCharCodeAt(uri, 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(s) {
   return %URIEscape(s);
 }
 
 // ECMA-262 - B.2.2.
 function URIUnescapeJS(s) {
   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;
-  };
-  return Decode(uri, reservedPredicate);
-}
-
-// ECMA-262 - 15.1.3.2.
-function URIDecodeComponent(component) {
-  var reservedPredicate = function(cc) { return false; };
-  return Decode(component, reservedPredicate);
-}
-
 // -------------------------------------------------------------------
 // Install exported functions.
 
 // Set up non-enumerable URI functions on the global object and set
 // their names.
 utils.InstallFunctions(global, DONT_ENUM, [
   "escape", URIEscapeJS,
-  "unescape", URIUnescapeJS,
-  "decodeURI", URIDecode,
-  "decodeURIComponent", URIDecodeComponent
+  "unescape", URIUnescapeJS
 ]);
 
 })