tests/compiler/dart2js/line_column_provider_test.dart

// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// Unittest for the [LineColumnCollector].

import 'package:expect/expect.dart';
import 'package:compiler/src/io/code_output.dart';
import 'package:compiler/src/io/line_column_provider.dart';

import 'output_collector.dart';

test(List events, Map<int, List<int>> expectedPositions) {
  BufferedEventSink sink = new BufferedEventSink();
  LineColumnProvider lineColumnProvider = new LineColumnCollector();
  CodeOutput output = new StreamCodeOutput(sink, [lineColumnProvider]);
  for (var event in events) {
    if (event is String) {
      output.add(event);
    } else if (event is CodeBuffer) {
      output.addBuffer(event);
    }
  }
  output.close();

  expectedPositions.forEach((int offset, List<int> expectedPosition) {
    if (expectedPosition == null) {
      Expect.throws(() => lineColumnProvider.getLine(offset),
                    (e) => true,
                    'Expected out-of-bounds offset: $offset\n'
                    'text:"""${sink.text}"""\n'
                    'lineColumnProvider:$lineColumnProvider');
    } else {
      int line = lineColumnProvider.getLine(offset);
      int column = lineColumnProvider.getColumn(line, offset);
      Expect.equals(expectedPosition[0], line,
          'Unexpected result: $offset -> $expectedPosition = [$line,$column]\n'
          'text:"""${sink.text}"""\n'
          'lineColumnProvider:$lineColumnProvider');
      Expect.equals(expectedPosition[1], column,
          'Unexpected result: $offset -> $expectedPosition = [$line,$column]\n'
          'text:"""${sink.text}"""\n'
          'lineColumnProvider:$lineColumnProvider');
    }
  });
}

main() {
  test([""], {0: [0, 0], 1: null});

  test([" "], {0: [0, 0], 1: [0, 1], 2: null});

  test(["\n "], {0: [0, 0], 1: [1, 0], 2: [1, 1], 3: null});

  Map positions = {0: [0, 0],
                   1: [0, 1],
                   2: [1, 0],
                   3: [1, 1],
                   4: [2, 0],
                   5: [2, 1],
                   6: null};

  test(["a\nb\nc"], positions);

  test(["a", "\nb\nc"], positions);

  test(["a", "\n", "b\nc"], positions);

  CodeBuffer buffer1 = new CodeBuffer();
  buffer1.add("a\nb\nc");
  test([buffer1], positions);

  CodeBuffer buffer2 = new CodeBuffer();
  buffer2.add("\nb\nc");
  test(["a", buffer2], positions);

  CodeBuffer buffer3 = new CodeBuffer();
  buffer3.add("a");
  test([buffer3, buffer2], positions);

  CodeBuffer buffer4 = new CodeBuffer();
  buffer4.addBuffer(buffer3);
  test([buffer4, buffer2], positions);
}