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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:path/path.dart' as p; | 5 import 'package:path/path.dart' as p; |
6 import 'package:string_scanner/string_scanner.dart'; | 6 import 'package:string_scanner/string_scanner.dart'; |
7 | 7 |
8 import 'ast.dart'; | 8 import 'ast.dart'; |
9 import 'utils.dart'; | 9 import 'utils.dart'; |
10 | 10 |
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26 : _scanner = new StringScanner(component), | 26 : _scanner = new StringScanner(component), |
27 _caseSensitive = caseSensitive; | 27 _caseSensitive = caseSensitive; |
28 | 28 |
29 /// Parses an entire glob. | 29 /// Parses an entire glob. |
30 SequenceNode parse() => _parseSequence(); | 30 SequenceNode parse() => _parseSequence(); |
31 | 31 |
32 /// Parses a [SequenceNode]. | 32 /// Parses a [SequenceNode]. |
33 /// | 33 /// |
34 /// If [inOptions] is true, this is parsing within an [OptionsNode]. | 34 /// If [inOptions] is true, this is parsing within an [OptionsNode]. |
35 SequenceNode _parseSequence({bool inOptions: false}) { | 35 SequenceNode _parseSequence({bool inOptions: false}) { |
36 var nodes = []; | 36 var nodes = <AstNode>[]; |
37 | 37 |
38 if (_scanner.isDone) { | 38 if (_scanner.isDone) { |
39 _scanner.error('expected a glob.', position: 0, length: 0); | 39 _scanner.error('expected a glob.', position: 0, length: 0); |
40 } | 40 } |
41 | 41 |
42 while (!_scanner.isDone) { | 42 while (!_scanner.isDone) { |
43 if (inOptions && (_scanner.matches(',') || _scanner.matches('}'))) break; | 43 if (inOptions && (_scanner.matches(',') || _scanner.matches('}'))) break; |
44 nodes.add(_parseNode(inOptions: inOptions)); | 44 nodes.add(_parseNode(inOptions: inOptions)); |
45 } | 45 } |
46 | 46 |
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92 if (_scanner.matches(']')) _scanner.error('unexpected "]".'); | 92 if (_scanner.matches(']')) _scanner.error('unexpected "]".'); |
93 var negated = _scanner.scan('!') || _scanner.scan('^'); | 93 var negated = _scanner.scan('!') || _scanner.scan('^'); |
94 | 94 |
95 readRangeChar() { | 95 readRangeChar() { |
96 var char = _scanner.readChar(); | 96 var char = _scanner.readChar(); |
97 if (negated || char != _SLASH) return char; | 97 if (negated || char != _SLASH) return char; |
98 _scanner.error('"/" may not be used in a range.', | 98 _scanner.error('"/" may not be used in a range.', |
99 position: _scanner.position - 1); | 99 position: _scanner.position - 1); |
100 } | 100 } |
101 | 101 |
102 var ranges = []; | 102 var ranges = <Range>[]; |
103 while (!_scanner.scan(']')) { | 103 while (!_scanner.scan(']')) { |
104 var start = _scanner.position; | 104 var start = _scanner.position; |
105 // Allow a backslash to escape a character. | 105 // Allow a backslash to escape a character. |
106 _scanner.scan('\\'); | 106 _scanner.scan('\\'); |
107 var char = readRangeChar(); | 107 var char = readRangeChar(); |
108 | 108 |
109 if (_scanner.scan('-')) { | 109 if (_scanner.scan('-')) { |
110 if (_scanner.matches(']')) { | 110 if (_scanner.matches(']')) { |
111 ranges.add(new Range.singleton(char)); | 111 ranges.add(new Range.singleton(char)); |
112 ranges.add(new Range.singleton(_HYPHEN)); | 112 ranges.add(new Range.singleton(_HYPHEN)); |
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133 negated: negated, caseSensitive: _caseSensitive); | 133 negated: negated, caseSensitive: _caseSensitive); |
134 } | 134 } |
135 | 135 |
136 /// Tries to parse an [OptionsNode]. | 136 /// Tries to parse an [OptionsNode]. |
137 /// | 137 /// |
138 /// Returns `null` if there's not one to parse. | 138 /// Returns `null` if there's not one to parse. |
139 AstNode _parseOptions() { | 139 AstNode _parseOptions() { |
140 if (!_scanner.scan('{')) return null; | 140 if (!_scanner.scan('{')) return null; |
141 if (_scanner.matches('}')) _scanner.error('unexpected "}".'); | 141 if (_scanner.matches('}')) _scanner.error('unexpected "}".'); |
142 | 142 |
143 var options = []; | 143 var options = <SequenceNode>[]; |
144 do { | 144 do { |
145 options.add(_parseSequence(inOptions: true)); | 145 options.add(_parseSequence(inOptions: true)); |
146 } while (_scanner.scan(',')); | 146 } while (_scanner.scan(',')); |
147 | 147 |
148 // Don't allow single-option blocks. | 148 // Don't allow single-option blocks. |
149 if (options.length == 1) _scanner.expect(','); | 149 if (options.length == 1) _scanner.expect(','); |
150 _scanner.expect('}'); | 150 _scanner.expect('}'); |
151 | 151 |
152 return new OptionsNode(options, caseSensitive: _caseSensitive); | 152 return new OptionsNode(options, caseSensitive: _caseSensitive); |
153 } | 153 } |
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170 | 170 |
171 for (var char in const [']', '(', ')']) { | 171 for (var char in const [']', '(', ')']) { |
172 if (_scanner.matches(char)) _scanner.error('unexpected "$char"'); | 172 if (_scanner.matches(char)) _scanner.error('unexpected "$char"'); |
173 } | 173 } |
174 if (!inOptions && _scanner.matches('}')) _scanner.error('unexpected "}"'); | 174 if (!inOptions && _scanner.matches('}')) _scanner.error('unexpected "}"'); |
175 | 175 |
176 return new LiteralNode(buffer.toString(), | 176 return new LiteralNode(buffer.toString(), |
177 context: _context, caseSensitive: _caseSensitive); | 177 context: _context, caseSensitive: _caseSensitive); |
178 } | 178 } |
179 } | 179 } |
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