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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 _interceptors; | 5 part of _interceptors; |
6 | 6 |
7 /** | 7 /** |
8 * The interceptor class for [String]. The compiler recognizes this | 8 * The interceptor class for [String]. The compiler recognizes this |
9 * class as an interceptor, and changes references to [:this:] to | 9 * class as an interceptor, and changes references to [:this:] to |
10 * actually use the receiver of the method, which is generated as an extra | 10 * actually use the receiver of the method, which is generated as an extra |
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173 default: | 173 default: |
174 return false; | 174 return false; |
175 } | 175 } |
176 } | 176 } |
177 | 177 |
178 // Dart2js can't use JavaScript trim, because JavaScript does not trim | 178 // Dart2js can't use JavaScript trim, because JavaScript does not trim |
179 // the NEXT LINE character (0x85) and BOMs (0xFEFF). | 179 // the NEXT LINE character (0x85) and BOMs (0xFEFF). |
180 String trim() { | 180 String trim() { |
181 const int CARRIAGE_RETURN = 0x0D; | 181 const int CARRIAGE_RETURN = 0x0D; |
182 const int SPACE = 0x20; | 182 const int SPACE = 0x20; |
183 const int NEL = 0x85; | |
184 const int BOM = 0xFEFF; | |
183 | 185 |
186 // Start by doing JS trim. Then check if it leaves a | |
floitsch
2014/02/19 10:20:36
Unfinished sentence.
Søren Gjesse
2014/02/19 10:44:10
Leaves a...?
Lasse Reichstein Nielsen
2014/02/19 11:43:16
Done.
| |
187 Strint result = JS("String", "#.trim()", this); | |
Søren Gjesse
2014/02/19 10:44:10
What type is Strint?
Lasse Reichstein Nielsen
2014/02/19 11:43:16
Done.
| |
188 | |
189 if (result.length == 0) return result; | |
190 int firstCode = result.codeUnitAt(0); | |
184 int startIndex = 0; | 191 int startIndex = 0; |
185 while (startIndex < this.length) { | 192 if (firstCode == NEL || firstCode == BOM) { |
186 int codeUnit = this.codeUnitAt(startIndex); | 193 startIndex++; |
187 if (codeUnit == SPACE || | 194 while (startIndex < result.length) { |
188 codeUnit == CARRIAGE_RETURN || | 195 int codeUnit = result.codeUnitAt(startIndex); |
189 _isWhitespace(codeUnit)) { | 196 if (codeUnit == SPACE || |
190 startIndex++; | 197 codeUnit == CARRIAGE_RETURN || |
191 } else { | 198 _isWhitespace(codeUnit)) { |
192 break; | 199 startIndex++; |
200 } else { | |
201 break; | |
202 } | |
203 } | |
204 if (startIndex == result.length) return ""; | |
205 } | |
206 | |
207 int endIndex = result.length; | |
208 // We know that there is at least one character that is non-whitespace. | |
209 // Therefore we don't need to verify that endIndex > startIndex. | |
210 int lastCode = result.codeUnitAt(endIndex - 1); | |
211 if (lastCode == NEL || lastCode == BOM) { | |
212 endIndex--; | |
213 while (true) { | |
214 int codeUnit = result.codeUnitAt(endIndex - 1); | |
215 if (codeUnit == SPACE || | |
216 codeUnit == CARRIAGE_RETURN || | |
217 _isWhitespace(codeUnit)) { | |
218 endIndex--; | |
219 } else { | |
220 break; | |
221 } | |
193 } | 222 } |
194 } | 223 } |
195 if (startIndex == this.length) return ""; | 224 if (startIndex == 0 && endIndex == result.length) return result; |
225 return JS('String', r'#.substring(#, #)', result, startIndex, endIndex); | |
226 } | |
196 | 227 |
197 int endIndex = this.length; | 228 String repeat(int times, [String separator = ""]) { |
198 // We know that there is at least one character that is non-whitespace. | 229 if (times < 0) throw new RangeError.value(times); |
199 // Therefore we don't need to verify that endIndex > startIndex. | 230 if (times == 0) return ""; |
200 while (true) { | 231 if (separator.isEmpty) { |
201 int codeUnit = this.codeUnitAt(endIndex - 1); | 232 return JS('String', "new Array(# + 1).join(#)", times, this); |
202 if (codeUnit == SPACE || | 233 } else { |
203 codeUnit == CARRIAGE_RETURN || | 234 var list = new JSArray.growable(times); |
204 _isWhitespace(codeUnit)) { | 235 for (int i = 0; i < times; i++) list[i] = this; |
205 endIndex--; | 236 return JS('String', "#.join(#)", list, separator); |
206 } else { | |
207 break; | |
208 } | |
209 } | 237 } |
210 if (startIndex == 0 && endIndex == this.length) return this; | 238 } |
211 return JS('String', r'#.substring(#, #)', this, startIndex, endIndex); | 239 |
240 String padLeft(int newSize, String padding, { int size }) { | |
241 if (size == null) { | |
242 size = this.length; | |
243 } else if (size < 0) { | |
244 throw new RangeError.value(size); | |
245 } | |
246 int delta = newSize - size; | |
247 if (delta <= 0) return this; | |
248 var list = new JSArray.growable(delta + 1); | |
249 list[delta] = this; | |
250 return JS("String", "#.join(#)", list, padding); | |
251 } | |
252 | |
253 String padRight(int newSize, String padding, { int size }) { | |
254 if (size == null) { | |
255 size = this.length; | |
256 } else if (size < 0) { | |
257 throw new RangeError.value(size); | |
258 } | |
259 int delta = newSize - size; | |
260 if (delta <= 0) return this; | |
261 var list = new JSArray.growable(delta + 1); | |
262 list[0] = this; | |
263 return JS("String", "#.join(#)", list, padding); | |
212 } | 264 } |
213 | 265 |
214 List<int> get codeUnits => new _CodeUnits(this); | 266 List<int> get codeUnits => new _CodeUnits(this); |
215 | 267 |
216 Runes get runes => new Runes(this); | 268 Runes get runes => new Runes(this); |
217 | 269 |
218 int indexOf(Pattern pattern, [int start = 0]) { | 270 int indexOf(Pattern pattern, [int start = 0]) { |
219 checkNull(pattern); | 271 checkNull(pattern); |
220 if (start is! int) throw new ArgumentError(start); | 272 if (start is! int) throw new ArgumentError(start); |
221 if (start < 0 || start > this.length) { | 273 if (start < 0 || start > this.length) { |
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314 */ | 366 */ |
315 class _CodeUnits extends UnmodifiableListBase<int> { | 367 class _CodeUnits extends UnmodifiableListBase<int> { |
316 /** The string that this is the code units of. */ | 368 /** The string that this is the code units of. */ |
317 String _string; | 369 String _string; |
318 | 370 |
319 _CodeUnits(this._string); | 371 _CodeUnits(this._string); |
320 | 372 |
321 int get length => _string.length; | 373 int get length => _string.length; |
322 int operator[](int i) => _string.codeUnitAt(i); | 374 int operator[](int i) => _string.codeUnitAt(i); |
323 } | 375 } |
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