v8/test/mjsunit/mirror-script.js

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// Flags: --expose-debug-as debug
// Test the mirror object for scripts.

function testScriptMirror(f, file_name, file_lines, script_type) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(f).script();
  var json = mirror.toJSONProtocol(true);
  print(json);

  // Check the mirror hierachy.
  assertTrue(mirror instanceof debug.Mirror);
  assertFalse(mirror instanceof debug.ValueMirror);
  assertTrue(mirror instanceof debug.ScriptMirror);

  // Check the mirror properties.
  assertTrue(mirror.isScript());
  assertEquals('script', mirror.type());
  var name = mirror.name();
  assertEquals(file_name, name.substring(name.length - file_name.length));
  assertEquals(0, mirror.lineOffset());
  assertEquals(0, mirror.columnOffset());
  if (file_lines > 0) {
    assertEquals(file_lines, mirror.lineCount());
  }
  assertEquals(script_type, mirror.scriptType());
  
  // Parse JSON representation and check.
  var fromJSON = eval('(' + json + ')');
  assertEquals('script', fromJSON.type);
  name = fromJSON.name;
  assertEquals(file_name, name.substring(name.length - file_name.length));
  assertEquals(0, fromJSON.lineOffset);
  assertEquals(0, fromJSON.columnOffset);
  if (file_lines > 0) {
    assertEquals(file_lines, fromJSON.lineCount);
  }
  assertEquals(script_type, fromJSON.scriptType);  
}


// Test the script mirror for different functions.
testScriptMirror(function(){}, 'mirror-script.js', 70, 2);
testScriptMirror(Math.sin, 'native math.js', -1, 0);