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, script_source) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(f).script();
  var serializer = debug.MakeMirrorSerializer();
  var json = serializer.serializeValue(mirror);

  // 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();
  if (name) {
    assertEquals(file_name, name.substring(name.length - file_name.length));
  } else {
    assertTrue(file_name === null);
  }
  assertEquals(0, mirror.lineOffset());
  assertEquals(0, mirror.columnOffset());
  if (file_lines > 0) {
    assertEquals(file_lines, mirror.lineCount());
  }
  assertEquals(script_type, mirror.scriptType());
  if (script_source) {
    assertEquals(script_source, mirror.source());
  }
  
  // Parse JSON representation and check.
  var fromJSON = eval('(' + json + ')');
  assertEquals('script', fromJSON.type);
  name = fromJSON.name;
  if (name) {
    assertEquals(file_name, name.substring(name.length - file_name.length));
  } else {
    assertTrue(file_name === null);
  }
  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', 92, 2);
testScriptMirror(Math.sin, 'native math.js', -1, 0);
testScriptMirror(eval('function(){}'), null, 1, 2, 'function(){}');
testScriptMirror(eval('function(){\n  }'), null, 2, 2, 'function(){\n  }');

// Test taking slices of source.
var mirror = debug.MakeMirror(eval('function(){\n  1;\n}')).script();
assertEquals('function(){\n', mirror.sourceSlice(0, 1).sourceText());
assertEquals('  1;\n', mirror.sourceSlice(1, 2).sourceText());
assertEquals('}', mirror.sourceSlice(2, 3).sourceText());
assertEquals('function(){\n  1;\n', mirror.sourceSlice(0, 2).sourceText());
assertEquals('  1;\n}', mirror.sourceSlice(1, 3).sourceText());
assertEquals('function(){\n  1;\n}', mirror.sourceSlice(0, 3).sourceText());