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Side by Side Diff: pkg/intl/lib/bidi_utils.dart

Issue 11266050: Rename regexp methods to getters. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Rebase and update status files with co19 issue number. Created 8 years, 1 month ago
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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 /** 5 /**
6 * Bidi stands for Bi-directional text. 6 * Bidi stands for Bi-directional text.
7 * According to http://en.wikipedia.org/wiki/Bi-directional_text: 7 * According to http://en.wikipedia.org/wiki/Bi-directional_text:
8 * Bi-directional text is text containing text in both text directionalities, 8 * Bi-directional text is text containing text in both text directionalities,
9 * both right-to-left (RTL) and left-to-right (LTR). It generally involves text 9 * both right-to-left (RTL) and left-to-right (LTR). It generally involves text
10 * containing different types of alphabets, but may also refer to boustrophedon, 10 * containing different types of alphabets, but may also refer to boustrophedon,
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236 * the whole piece. If the tag already has a direction specified, this new one 236 * the whole piece. If the tag already has a direction specified, this new one
237 * will override existing one in behavior (tested on FF and IE). 237 * will override existing one in behavior (tested on FF and IE).
238 */ 238 */
239 static String _enforceInHtmlHelper(String html, String direction) { 239 static String _enforceInHtmlHelper(String html, String direction) {
240 if (html.startsWith('<')) { 240 if (html.startsWith('<')) {
241 StringBuffer buffer = new StringBuffer(); 241 StringBuffer buffer = new StringBuffer();
242 var startIndex = 0; 242 var startIndex = 0;
243 Match match = const RegExp('<\\w+').firstMatch(html); 243 Match match = const RegExp('<\\w+').firstMatch(html);
244 if (match != null) { 244 if (match != null) {
245 buffer.add(html.substring( 245 buffer.add(html.substring(
246 startIndex, match.end())).add(' dir=$direction'); 246 startIndex, match.end)).add(' dir=$direction');
247 startIndex = match.end(); 247 startIndex = match.end;
248 } 248 }
249 return buffer.add(html.substring(startIndex)).toString(); 249 return buffer.add(html.substring(startIndex)).toString();
250 } 250 }
251 // '\n' is important for FF so that it won't incorrectly merge span groups. 251 // '\n' is important for FF so that it won't incorrectly merge span groups.
252 return '\n<span dir=$direction>$html</span>'; 252 return '\n<span dir=$direction>$html</span>';
253 } 253 }
254 254
255 /** 255 /**
256 * Apply bracket guard to [str] using html span tag. This is to address the 256 * Apply bracket guard to [str] using html span tag. This is to address the
257 * problem of messy bracket display that frequently happens in RTL layout. 257 * problem of messy bracket display that frequently happens in RTL layout.
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289 * would return 'firehydrant!'. 289 * would return 'firehydrant!'.
290 */ 290 */
291 // TODO(efortuna): Get rid of this once this is implemented in Dart. 291 // TODO(efortuna): Get rid of this once this is implemented in Dart.
292 // See Issue 2979. 292 // See Issue 2979.
293 static String _guardBracketHelper(String str, RegExp regexp, [String before, 293 static String _guardBracketHelper(String str, RegExp regexp, [String before,
294 String after]) { 294 String after]) {
295 StringBuffer buffer = new StringBuffer(); 295 StringBuffer buffer = new StringBuffer();
296 var startIndex = 0; 296 var startIndex = 0;
297 Iterable matches = regexp.allMatches(str); 297 Iterable matches = regexp.allMatches(str);
298 for (Match match in matches) { 298 for (Match match in matches) {
299 buffer.add(str.substring(startIndex, match.start())).add(before); 299 buffer.add(str.substring(startIndex, match.start)).add(before);
300 buffer.add(str.substring(match.start(), match.end())).add(after); 300 buffer.add(str.substring(match.start, match.end)).add(after);
301 startIndex = match.end(); 301 startIndex = match.end;
302 } 302 }
303 return buffer.add(str.substring(startIndex)).toString(); 303 return buffer.add(str.substring(startIndex)).toString();
304 } 304 }
305 305
306 /** 306 /**
307 * Estimates the directionality of [text] using the best known 307 * Estimates the directionality of [text] using the best known
308 * general-purpose method (using relative word counts). A 308 * general-purpose method (using relative word counts). A
309 * TextDirection.UNKNOWN return value indicates completely neutral input. 309 * TextDirection.UNKNOWN return value indicates completely neutral input.
310 * [isHtml] is true if [text] HTML or HTML-escaped. 310 * [isHtml] is true if [text] HTML or HTML-escaped.
311 * 311 *
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391 391
392 /** 392 /**
393 * Check the estimated directionality of [str], return true if the piece of 393 * Check the estimated directionality of [str], return true if the piece of
394 * text should be laid out in RTL direction. If [isHtml] is true, the string 394 * text should be laid out in RTL direction. If [isHtml] is true, the string
395 * is HTML or HTML-escaped. 395 * is HTML or HTML-escaped.
396 */ 396 */
397 static bool detectRtlDirectionality(String str, {bool isHtml: false}) { 397 static bool detectRtlDirectionality(String str, {bool isHtml: false}) {
398 return estimateDirectionOfText(str, isHtml: isHtml) == TextDirection.RTL; 398 return estimateDirectionOfText(str, isHtml: isHtml) == TextDirection.RTL;
399 } 399 }
400 } 400 }
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