test/span_scanner_test.dart

// Copyright (c) 2014, 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.

library string_scanner.span_scanner_test;

import 'package:string_scanner/string_scanner.dart';
import 'package:unittest/unittest.dart';

void main() {
  var scanner;
  setUp(() {
    scanner = new SpanScanner('foo\nbar\nbaz', 'source');
  });

  test("tracks the span for the last match", () {
    scanner.scan('fo');
    scanner.scan('o\nba');

    var span = scanner.lastSpan;
    expect(span.start.offset, equals(2));
    expect(span.start.line, equals(0));
    expect(span.start.column, equals(2));
    expect(span.start.sourceUrl, equals('source'));

    expect(span.end.offset, equals(6));
    expect(span.end.line, equals(1));
    expect(span.end.column, equals(2));
    expect(span.start.sourceUrl, equals('source'));

    expect(span.text, equals('o\nba'));
  });

  test(".spanFrom() returns a span from a previous state", () {
    scanner.scan('fo');
    var state = scanner.state;
    scanner.scan('o\nba');
    scanner.scan('r\nba');

    var span = scanner.spanFrom(state);
    expect(span.text, equals('o\nbar\nba'));
  });

  test(".emptySpan returns an empty span at the current location", () {
    scanner.scan('foo\nba');

    var span = scanner.emptySpan;
    expect(span.start.offset, equals(6));
    expect(span.start.line, equals(1));
    expect(span.start.column, equals(2));
    expect(span.start.sourceUrl, equals('source'));

    expect(span.end.offset, equals(6));
    expect(span.end.line, equals(1));
    expect(span.end.column, equals(2));
    expect(span.start.sourceUrl, equals('source'));

    expect(span.text, equals(''));
  });
}