escape.js

Google浏览器V8内核代码

// Copyright 2008 the V8 project authors. All rights reserved.
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/**
 * @fileoverview Check that the global escape and unescape functions work
 * right.
 */

// Section B.2.1 of ECMAScript 3
var unescaped = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@*_+-./";

// Check the unescape chars are not escaped
assertEquals(unescaped, escape(unescaped));
// Check spaces are escaped
assertEquals("%20/%20", escape(" / "));
// Check that null chars are escaped and do not terminate the string
assertEquals("%000", escape("\0" + "0"));
// Check a unicode escape
assertEquals("A%20B%u1234%00%20C", escape(String.fromCharCode(0x41, 0x20, 0x42, 0x1234, 0, 0x20, 0x43)));
// Check unicode escapes have a leading zero to pad to 4 digits
assertEquals("%u0123", escape(String.fromCharCode(0x123)));
// Check escapes are upper case
assertEquals("%uABCD", escape(String.fromCharCode(0xabcd)));
assertEquals("%AB", escape(String.fromCharCode(0xab)));
assertEquals("%0A", escape("\n"));

// Check first 1000 chars individually for escaped/not escaped
for (var i = 0; i < 1000; i++) {
  var s = String.fromCharCode(i);
  if (unescaped.indexOf(s, 0) == -1) {
    assertFalse(s == escape(s));
  } else {
    assertTrue(s == escape(s));
  }
}

// Check all chars up to 1000 in groups of 10 using unescape as a check
for (var i = 0; i < 1000; i += 10) {
  var s = String.fromCharCode(i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9);
  assertEquals(s, unescape(escape(s)));
}

// Benchmark
var example = "Now is the time for all good men to come to the aid of the party.";
example = example + String.fromCharCode(267, 0x1234, 0x6667, 0xabcd);
example = example + " The quick brown fox jumps over the lazy dog."
example = example + String.fromCharCode(171, 172, 173, 174, 175, 176, 178, 179);

for (var i = 0; i < 3000; i++) {
  assertEquals(example, unescape(escape(example)));
}

// Check unescape can cope with upper and lower case
assertEquals(unescape("%41%4A%4a"), "AJJ");

// Check upper case U
assertEquals("%U1234", unescape("%U1234"));

// Check malformed unescapes
assertEquals("%", unescape("%"));
assertEquals("%4", unescape("%4"));
assertEquals("%u", unescape("%u"));
assertEquals("%u4", unescape("%u4"));
assertEquals("%u44", unescape("%u44"));
assertEquals("%u444", unescape("%u444"));
assertEquals("%4z", unescape("%4z"));
assertEquals("%uzzzz", unescape("%uzzzz"));
assertEquals("%u4zzz", unescape("%u4zzz"));
assertEquals("%u44zz", unescape("%u44zz"));
assertEquals("%u444z", unescape("%u444z"));
assertEquals("%4<", unescape("%4<"));
assertEquals("%u<<<<", unescape("%u<<<<"));
assertEquals("%u4<<<", unescape("%u4<<<"));
assertEquals("%u44<<", unescape("%u44<<"));
assertEquals("%u444<", unescape("%u444<"));
assertEquals("foo%4<", unescape("foo%4<"));
assertEquals("foo%u<<<<", unescape("foo%u<<<<"));
assertEquals("foo%u4<<<", unescape("foo%u4<<<"));
assertEquals("foo%u44<<", unescape("foo%u44<<"));
assertEquals("foo%u444<", unescape("foo%u444<"));
assertEquals("foo%4<bar", unescape("foo%4<bar"));
assertEquals("foo%u<<<<bar", unescape("foo%u<<<<bar"));
assertEquals("foo%u4<<<bar", unescape("foo%u4<<<bar"));
assertEquals("foo%u44<<bar", unescape("foo%u44<<bar"));
assertEquals("foo%u444<bar", unescape("foo%u444<bar"));
assertEquals("% ", unescape("%%20"));
assertEquals("%% ", unescape("%%%20"));

// Unescape stress
var eexample = escape(example);

for (var i = 1; i < 3000; i++) {
  assertEquals(example, unescape(eexample));
}