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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 import 'package:charcode/ascii.dart'; | 5 import 'package:charcode/ascii.dart'; |
6 | 6 |
7 import 'string_scanner.dart'; | 7 import 'string_scanner.dart'; |
8 | 8 |
9 // Note that much of this code is duplicated in eager_span_scanner.dart. | 9 // Note that much of this code is duplicated in eager_span_scanner.dart. |
10 | 10 |
11 /// A regular expression matching newlines across platforms. | 11 /// A regular expression matching newlines across platforms. |
12 final _newlineRegExp = new RegExp(r"\r\n?|\n"); | 12 final _newlineRegExp = new RegExp(r"\r\n?|\n"); |
13 | 13 |
14 /// A subclass of [StringScanner] that tracks line and column information. | 14 /// A subclass of [StringScanner] that tracks line and column information. |
15 class LineScanner extends StringScanner { | 15 class LineScanner extends StringScanner { |
16 /// The scanner's current (zero-based) line number. | 16 /// The scanner's current (zero-based) line number. |
17 int get line => _line; | 17 int get line => _line; |
18 int _line = 0; | 18 int _line = 0; |
19 | 19 |
20 /// The scanner's current (zero-based) column number. | 20 /// The scanner's current (zero-based) column number. |
21 int get column => _column; | 21 int get column => _column; |
22 int _column = 0; | 22 int _column = 0; |
23 | 23 |
24 /// The scanner's state, including line and column information. | 24 /// The scanner's state, including line and column information. |
25 /// | 25 /// |
26 /// This can be used to efficiently save and restore the state of the scanner | 26 /// This can be used to efficiently save and restore the state of the scanner |
27 /// when backtracking. A given [LineScannerState] is only valid for the | 27 /// when backtracking. A given [LineScannerState] is only valid for the |
28 /// [LineScanner] that created it. | 28 /// [LineScanner] that created it. |
| 29 /// |
| 30 /// This does not include the scanner's match information. |
29 LineScannerState get state => | 31 LineScannerState get state => |
30 new LineScannerState._(this, position, line, column); | 32 new LineScannerState._(this, position, line, column); |
31 | 33 |
32 /// Whether the current position is between a CR character and an LF | 34 /// Whether the current position is between a CR character and an LF |
33 /// charactet. | 35 /// charactet. |
34 bool get _betweenCRLF => peekChar(-1) == $cr && peekChar() == $lf; | 36 bool get _betweenCRLF => peekChar(-1) == $cr && peekChar() == $lf; |
35 | 37 |
36 set state(LineScannerState state) { | 38 set state(LineScannerState state) { |
37 if (!identical(state._scanner, this)) { | 39 if (!identical(state._scanner, this)) { |
38 throw new ArgumentError("The given LineScannerState was not returned by " | 40 throw new ArgumentError("The given LineScannerState was not returned by " |
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127 final int position; | 129 final int position; |
128 | 130 |
129 /// The zero-based line number of the scanner in this state. | 131 /// The zero-based line number of the scanner in this state. |
130 final int line; | 132 final int line; |
131 | 133 |
132 /// The zero-based column number of the scanner in this state. | 134 /// The zero-based column number of the scanner in this state. |
133 final int column; | 135 final int column; |
134 | 136 |
135 LineScannerState._(this._scanner, this.position, this.line, this.column); | 137 LineScannerState._(this._scanner, this.position, this.line, this.column); |
136 } | 138 } |
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