Javascript
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393行
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11.66 KB
// 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;
} 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;
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 {
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;
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 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");
}
}
}
}
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);
}
}
}
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
));
})();