mirror-array.js

Google浏览器V8内核代码

// Copyright 2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Flags: --expose-debug-as debug
// Test the mirror object for objects

function testArrayMirror(a, names) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(a);
  var json = mirror.toJSONProtocol(true);

  // Check the mirror hierachy.
  assertTrue(mirror instanceof debug.Mirror);
  assertTrue(mirror instanceof debug.ValueMirror);
  assertTrue(mirror instanceof debug.ObjectMirror);
  assertTrue(mirror instanceof debug.ArrayMirror);

  // Check the mirror properties.
  assertTrue(mirror.isArray());
  assertEquals('object', mirror.type());
  assertFalse(mirror.isPrimitive());
  assertEquals('Array', mirror.className());
  assertTrue(mirror.constructorFunction() instanceof debug.ObjectMirror);
  assertTrue(mirror.protoObject() instanceof debug.Mirror);
  assertTrue(mirror.prototypeObject() instanceof debug.Mirror);
  assertEquals(mirror.length(), a.length);
  
  var indexedValueMirrors = mirror.indexedPropertiesFromRange();
  assertEquals(indexedValueMirrors.length, a.length);
  for (var i = 0; i < indexedValueMirrors.length; i++) {
    assertTrue(indexedValueMirrors[i] instanceof debug.Mirror);
    if (a[i]) {
      assertTrue(indexedValueMirrors[i] instanceof debug.PropertyMirror);
    }
  }

  // Parse JSON representation and check.
  var fromJSON = eval('(' + json + ')');
  assertEquals('object', fromJSON.type);
  assertEquals('Array', fromJSON.className);
  assertEquals('function', fromJSON.constructorFunction.type);
  assertEquals('Array', fromJSON.constructorFunction.name);
  assertEquals(a.length, fromJSON.length);

  // Check that the serialization contains all indexed properties.
  for (var i = 0; i < fromJSON.indexedProperties.length; i++) {
    var index = fromJSON.indexedProperties[i].name;
    assertEquals(indexedValueMirrors[index].name(), index);
    assertEquals(indexedValueMirrors[index].value().type(), fromJSON.indexedProperties[i].value.type, index);
  }

  // Check that the serialization contains all names properties.
  if (names) {
    for (var i = 0; i < names.length; i++) {
      var found = false;
      for (var j = 0; j < fromJSON.properties.length; j++) {
        if (names[i] == fromJSON.properties[j].name) {
          found = true; 
        }
      }
      assertTrue(found, names[i])
    }
  } else {
    assertEquals(1, fromJSON.properties.length)
  }
}


// Test a number of different arrays.
testArrayMirror([]);
testArrayMirror([1]);
testArrayMirror([1,2]);
testArrayMirror(["a", function(){}, [1,2], 2, /[ab]/]);

a=[1];
a[100]=7;
testArrayMirror(a);

a=[1,2,3];
a.x=2.2;
a.y=function(){return null;}
testArrayMirror(a, ['x','y']);

var a = []; a.push(a);
testArrayMirror(a);