v8/test/mjsunit/mirror-script.js

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

function testScriptMirror(f, file_name, file_lines, type, compilation_type,
                          source, eval_from_line) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(f).script();
  var serializer = debug.MakeMirrorSerializer();
  var json = JSON.stringify(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(type, mirror.scriptType());
  assertEquals(compilation_type, mirror.compilationType(), "compilation type");
  if (source) {
    assertEquals(source, mirror.source());
  }
  if (eval_from_line) {
    assertEquals(eval_from_line,  mirror.evalFromLocation().line);
  }

  // Parse JSON representation and check.
  var fromJSON = JSON.parse(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(type, fromJSON.scriptType);
  assertEquals(compilation_type, fromJSON.compilationType);
}


// Test the script mirror for different functions.
testScriptMirror(function(){}, 'mirror-script.js', 98, 2, 0);
testScriptMirror(Math.round, 'native math.js', -1, 0, 0);
testScriptMirror(eval('(function(){})'), null, 1, 2, 1, '(function(){})', 87);
testScriptMirror(eval('(function(){\n  })'), null, 2, 2, 1, '(function(){\n  })', 88);

// 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());