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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 'location.dart'; | 5 import 'location.dart'; |
6 import 'span.dart'; | 6 import 'span.dart'; |
7 import 'utils.dart'; | 7 import 'utils.dart'; |
8 | 8 |
9 /// A class that describes a segment of source text with additional context. | 9 /// A class that describes a segment of source text with additional context. |
10 class SourceSpanWithContext extends SourceSpanBase { | 10 class SourceSpanWithContext extends SourceSpanBase { |
| 11 // This is a getter so that subclasses can override it. |
11 /// Text around the span, which includes the line containing this span. | 12 /// Text around the span, which includes the line containing this span. |
12 final String context; | 13 String get context => _context; |
| 14 final String _context; |
13 | 15 |
14 /// Creates a new span from [start] to [end] (exclusive) containing [text], in | 16 /// Creates a new span from [start] to [end] (exclusive) containing [text], in |
15 /// the given [context]. | 17 /// the given [context]. |
16 /// | 18 /// |
17 /// [start] and [end] must have the same source URL and [start] must come | 19 /// [start] and [end] must have the same source URL and [start] must come |
18 /// before [end]. [text] must have a number of characters equal to the | 20 /// before [end]. [text] must have a number of characters equal to the |
19 /// distance between [start] and [end]. [context] must contain [text], and | 21 /// distance between [start] and [end]. [context] must contain [text], and |
20 /// [text] should start at `start.column` from the beginning of a line in | 22 /// [text] should start at `start.column` from the beginning of a line in |
21 /// [context]. | 23 /// [context]. |
22 SourceSpanWithContext( | 24 SourceSpanWithContext( |
23 SourceLocation start, SourceLocation end, String text, this.context) | 25 SourceLocation start, SourceLocation end, String text, this._context) |
24 : super(start, end, text) { | 26 : super(start, end, text) { |
25 if (!context.contains(text)) { | 27 if (!context.contains(text)) { |
26 throw new ArgumentError( | 28 throw new ArgumentError( |
27 'The context line "$context" must contain "$text".'); | 29 'The context line "$context" must contain "$text".'); |
28 } | 30 } |
29 | 31 |
30 if (findLineStart(context, text, start.column) == null) { | 32 if (findLineStart(context, text, start.column) == null) { |
31 throw new ArgumentError('The span text "$text" must start at ' | 33 throw new ArgumentError('The span text "$text" must start at ' |
32 'column ${start.column + 1} in a line within "$context".'); | 34 'column ${start.column + 1} in a line within "$context".'); |
33 } | 35 } |
34 } | 36 } |
35 } | 37 } |
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