node/deps/v8/test/mjsunit/mirror-string.js

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// Flags: --expose-debug-as debug
// Test the mirror object for string values

const kMaxProtocolStringLength = 80; // Constant from mirror-delay.js

function testStringMirror(s) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(s);
  var serializer = debug.MakeMirrorSerializer();
  var json = JSON.stringify(serializer.serializeValue(mirror));

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

  // Check the mirror properties.
  assertTrue(mirror.isString());
  assertEquals('string', mirror.type());
  assertTrue(mirror.isPrimitive());

  // Test text representation
  if (s.length <= kMaxProtocolStringLength) {
    assertEquals(s, mirror.toText());
  } else {
    assertEquals(s.substring(0, kMaxProtocolStringLength),
                 mirror.toText().substring(0, kMaxProtocolStringLength));
  }

  // Parse JSON representation and check.
  var fromJSON = eval('(' + json + ')');
  assertEquals('string', fromJSON.type);
  if (s.length <= kMaxProtocolStringLength) {
    assertEquals(s, fromJSON.value);
  } else {
    assertEquals(s.substring(0, kMaxProtocolStringLength),
                 fromJSON.value.substring(0, kMaxProtocolStringLength));
    assertEquals(fromJSON.fromIndex, 0);
    assertEquals(fromJSON.toIndex, kMaxProtocolStringLength);
  }
}

// Test a number of different strings.
testStringMirror('');
testStringMirror('abcdABCD');
testStringMirror('1234');
testStringMirror('"');
testStringMirror('"""');
testStringMirror("'");
testStringMirror("'''");
testStringMirror("'\"'");
testStringMirror('\\');
testStringMirror('\b\t\n\f\r');
testStringMirror('\u0001\u0002\u001E\u001F');
testStringMirror('"a":1,"b":2');

var s = "1234567890"
s = s + s + s + s + s + s + s + s;
assertEquals(kMaxProtocolStringLength, s.length);
testStringMirror(s);
s = s + 'X';
testStringMirror(s);