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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, 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 part of dart._internal; | 5 part of dart._internal; |
6 | 6 |
7 /** | 7 /** |
8 * Implementation of [core.Symbol]. This class uses the same name as | 8 * Implementation of [core.Symbol]. This class uses the same name as |
9 * a core class so a user can't tell the difference. | 9 * a core class so a user can't tell the difference. |
10 * | 10 * |
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88 // which matches any identifier. | 88 // which matches any identifier. |
89 | 89 |
90 /** | 90 /** |
91 * RegExp that validates a non-empty symbol. | 91 * RegExp that validates a non-empty symbol. |
92 * | 92 * |
93 * Private symbols are accepted. | 93 * Private symbols are accepted. |
94 * | 94 * |
95 * The empty symbol is handled before this regexp is used, and is not | 95 * The empty symbol is handled before this regexp is used, and is not |
96 * accepted. | 96 * accepted. |
97 */ | 97 */ |
98 static final RegExp symbolPattern = new RegExp( | 98 static final RegExp symbolPattern = |
99 '^(?:$operatorRE\$|$identifierRE(?:=?\$|[.](?!\$)))+?\$'); | 99 new RegExp('^(?:$operatorRE\$|$identifierRE(?:=?\$|[.](?!\$)))+?\$'); |
100 | 100 |
101 external const Symbol(String name); | 101 external const Symbol(String name); |
102 | 102 |
103 /** | 103 /** |
104 * Platform-private method used by the mirror system to create | 104 * Platform-private method used by the mirror system to create |
105 * otherwise invalid names. | 105 * otherwise invalid names. |
106 */ | 106 */ |
107 const Symbol.unvalidated(this._name); | 107 const Symbol.unvalidated(this._name); |
108 | 108 |
109 // This is called by dart2js. | 109 // This is called by dart2js. |
110 Symbol.validated(String name) | 110 Symbol.validated(String name) : this._name = validatePublicSymbol(name); |
111 : this._name = validatePublicSymbol(name); | |
112 | 111 |
113 bool operator ==(other) => other is Symbol && _name == other._name; | 112 bool operator ==(other) => other is Symbol && _name == other._name; |
114 | 113 |
115 external int get hashCode; | 114 external int get hashCode; |
116 | 115 |
117 external toString(); | 116 external toString(); |
118 | 117 |
119 /// Platform-private accessor which cannot be called from user libraries. | 118 /// Platform-private accessor which cannot be called from user libraries. |
120 static String getName(Symbol symbol) => symbol._name; | 119 static String getName(Symbol symbol) => symbol._name; |
121 | 120 |
122 static String validatePublicSymbol(String name) { | 121 static String validatePublicSymbol(String name) { |
123 if (name.isEmpty || publicSymbolPattern.hasMatch(name)) return name; | 122 if (name.isEmpty || publicSymbolPattern.hasMatch(name)) return name; |
124 if (name.startsWith('_')) { | 123 if (name.startsWith('_')) { |
125 // There may be other private parts in a qualified name than the first | 124 // There may be other private parts in a qualified name than the first |
126 // one, but this is a common case that deserves a specific error | 125 // one, but this is a common case that deserves a specific error |
127 // message. | 126 // message. |
128 throw new ArgumentError('"$name" is a private identifier'); | 127 throw new ArgumentError('"$name" is a private identifier'); |
129 } | 128 } |
130 throw new ArgumentError( | 129 throw new ArgumentError('"$name" is not a valid (qualified) symbol name'); |
131 '"$name" is not a valid (qualified) symbol name'); | |
132 } | 130 } |
133 | 131 |
134 /** | 132 /** |
135 * Checks whether name is a valid symbol name. | 133 * Checks whether name is a valid symbol name. |
136 * | 134 * |
137 * This test allows both private and non-private symbols. | 135 * This test allows both private and non-private symbols. |
138 */ | 136 */ |
139 static bool isValidSymbol(String name) { | 137 static bool isValidSymbol(String name) { |
140 return (name.isEmpty || symbolPattern.hasMatch(name)); | 138 return (name.isEmpty || symbolPattern.hasMatch(name)); |
141 } | 139 } |
142 } | 140 } |
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