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| 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 |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 part of csslib.visitor; |
| 6 |
| 7 /** |
| 8 * Visitor that produces a formatted string representation of the CSS tree. |
| 9 */ |
| 10 class CssPrinter extends Visitor { |
| 11 StringBuffer _buff = new StringBuffer(); |
| 12 bool prettyPrint = true; |
| 13 |
| 14 /** |
| 15 * Walk the [tree] Stylesheet. [pretty] if true emits line breaks, extra |
| 16 * spaces, friendly property values, etc., if false emits compacted output. |
| 17 */ |
| 18 void visitTree(StyleSheet tree, {bool pretty: false}) { |
| 19 prettyPrint = pretty; |
| 20 _buff = new StringBuffer(); |
| 21 visitStyleSheet(tree); |
| 22 } |
| 23 |
| 24 /** Appends [str] to the output buffer. */ |
| 25 void emit(String str) { |
| 26 _buff.write(str); |
| 27 } |
| 28 |
| 29 /** Returns the output buffer. */ |
| 30 String toString() => _buff.toString().trim(); |
| 31 |
| 32 String get _newLine => prettyPrint ? '\n' : ' '; |
| 33 String get _sp => prettyPrint ? ' ' : ''; |
| 34 |
| 35 // TODO(terry): When adding obfuscation we'll need isOptimized (compact w/ |
| 36 // obufuscation) and have isTesting (compact no obfuscation) and |
| 37 // isCompact would be !prettyPrint. We'll need another boolean |
| 38 // flag for obfuscation. |
| 39 bool get _isTesting => !prettyPrint; |
| 40 |
| 41 void visitCssComment(CssComment node) { |
| 42 emit('/* ${node.comment} */'); |
| 43 } |
| 44 |
| 45 void visitCommentDefinition(CommentDefinition node) { |
| 46 emit('<!-- ${node.comment} -->'); |
| 47 } |
| 48 |
| 49 void visitMediaExpression(MediaExpression node) { |
| 50 emit(node.andOperator ? ' AND ' : ' '); |
| 51 emit('(${node.mediaFeature}:'); |
| 52 visitExpressions(node.exprs); |
| 53 emit(')'); |
| 54 } |
| 55 |
| 56 void visitMediaQuery(MediaQuery query) { |
| 57 var unary = query.hasUnary ? ' ${query.unary}' : ''; |
| 58 var mediaType = query.hasMediaType ? ' ${query.mediaType}' : ''; |
| 59 emit('$unary$mediaType'); |
| 60 for (var expression in query.expressions) { |
| 61 visitMediaExpression(expression); |
| 62 } |
| 63 } |
| 64 |
| 65 void emitMediaQueries(queries) { |
| 66 var queriesLen = queries.length; |
| 67 for (var i = 0; i < queriesLen; i++) { |
| 68 var query = queries[i]; |
| 69 if (query.hasMediaType && i > 0) emit(','); |
| 70 visitMediaQuery(query); |
| 71 } |
| 72 } |
| 73 |
| 74 void visitMediaDirective(MediaDirective node) { |
| 75 emit(' @media'); |
| 76 emitMediaQueries(node.mediaQueries); |
| 77 emit(' {'); |
| 78 for (var ruleset in node.rulesets) { |
| 79 ruleset.visit(this); |
| 80 } |
| 81 emit('$_newLine\}'); |
| 82 } |
| 83 |
| 84 void visitHostDirective(HostDirective node) { |
| 85 emit('\n@host {'); |
| 86 for (var ruleset in node.rulesets) { |
| 87 ruleset.visit(this); |
| 88 } |
| 89 emit('$_newLine\}'); |
| 90 } |
| 91 |
| 92 /** |
| 93 * @page : pseudoPage { |
| 94 * decls |
| 95 * } |
| 96 */ |
| 97 void visitPageDirective(PageDirective node) { |
| 98 emit('$_newLine@page'); |
| 99 if (node.hasIdent || node.hasPseudoPage) { |
| 100 if (node.hasIdent) emit(' '); |
| 101 emit(node._ident); |
| 102 emit(node.hasPseudoPage ? ':${node._pseudoPage}' : ''); |
| 103 } |
| 104 emit(' '); |
| 105 |
| 106 var declsMargin = node._declsMargin; |
| 107 int declsMarginLength = declsMargin.length; |
| 108 for (var i = 0; i < declsMarginLength; i++) { |
| 109 if (i > 0) emit(_newLine); |
| 110 emit('{$_newLine'); |
| 111 declsMargin[i].visit(this); |
| 112 emit('}'); |
| 113 } |
| 114 } |
| 115 |
| 116 /** @charset "charset encoding" */ |
| 117 void visitCharsetDirective(CharsetDirective node) { |
| 118 emit('$_newLine@charset "${node.charEncoding}";'); |
| 119 } |
| 120 |
| 121 void visitImportDirective(ImportDirective node) { |
| 122 bool isStartingQuote(String ch) => ('\'"'.indexOf(ch[0]) >= 0); |
| 123 |
| 124 if (_isTesting) { |
| 125 // Emit assuming url() was parsed; most suite tests use url function. |
| 126 emit(' @import url(${node.import})'); |
| 127 } else if (isStartingQuote(node.import)) { |
| 128 emit(' @import ${node.import}'); |
| 129 } else { |
| 130 // url(...) isn't needed only a URI can follow an @import directive; emit |
| 131 // url as a string. |
| 132 emit(' @import "${node.import}"'); |
| 133 } |
| 134 emitMediaQueries(node.mediaQueries); |
| 135 emit(';'); |
| 136 } |
| 137 |
| 138 void visitKeyFrameDirective(KeyFrameDirective node) { |
| 139 emit('$_newLine${node.keyFrameName} '); |
| 140 node._name.visit(this); |
| 141 emit('$_sp{$_newLine'); |
| 142 for (final block in node._blocks) { |
| 143 block.visit(this); |
| 144 } |
| 145 emit('}'); |
| 146 } |
| 147 |
| 148 void visitFontFaceDirective(FontFaceDirective node) { |
| 149 emit('$_newLine@font-face '); |
| 150 emit('$_sp{$_newLine'); |
| 151 node._declarations.visit(this); |
| 152 emit('}'); |
| 153 } |
| 154 |
| 155 void visitKeyFrameBlock(KeyFrameBlock node) { |
| 156 emit('$_sp$_sp'); |
| 157 node._blockSelectors.visit(this); |
| 158 emit('$_sp{$_newLine'); |
| 159 node._declarations.visit(this); |
| 160 emit('$_sp$_sp}$_newLine'); |
| 161 } |
| 162 |
| 163 void visitStyletDirective(StyletDirective node) { |
| 164 emit('/* @stylet export as ${node._dartClassName} */\n'); |
| 165 } |
| 166 |
| 167 void visitNamespaceDirective(NamespaceDirective node) { |
| 168 bool isStartingQuote(String ch) => ('\'"'.indexOf(ch) >= 0); |
| 169 |
| 170 if (isStartingQuote(node._uri)) { |
| 171 emit(' @namespace ${node.prefix}"${node._uri}"'); |
| 172 } else { |
| 173 if (_isTesting) { |
| 174 // Emit exactly was we parsed. |
| 175 emit(' @namespace ${node.prefix}url(${node._uri})'); |
| 176 } else { |
| 177 // url(...) isn't needed only a URI can follow a: |
| 178 // @namespace prefix directive. |
| 179 emit(' @namespace ${node.prefix}${node._uri}'); |
| 180 } |
| 181 } |
| 182 emit(';'); |
| 183 } |
| 184 |
| 185 void visitVarDefinitionDirective(VarDefinitionDirective node) { |
| 186 visitVarDefinition(node.def); |
| 187 emit(';$_newLine'); |
| 188 } |
| 189 |
| 190 void visitRuleSet(RuleSet node) { |
| 191 emit("$_newLine"); |
| 192 node._selectorGroup.visit(this); |
| 193 emit(" {$_newLine"); |
| 194 node._declarationGroup.visit(this); |
| 195 emit("}"); |
| 196 } |
| 197 |
| 198 void visitDeclarationGroup(DeclarationGroup node) { |
| 199 var declarations = node._declarations; |
| 200 var declarationsLength = declarations.length; |
| 201 for (var i = 0; i < declarationsLength; i++) { |
| 202 if (i > 0) emit(_newLine); |
| 203 emit("$_sp$_sp"); |
| 204 declarations[i].visit(this); |
| 205 emit(";"); |
| 206 } |
| 207 if (declarationsLength > 0) emit(_newLine); |
| 208 } |
| 209 |
| 210 void visitMarginGroup(MarginGroup node) { |
| 211 var margin_sym_name = |
| 212 TokenKind.idToValue(TokenKind.MARGIN_DIRECTIVES, node.margin_sym); |
| 213 |
| 214 emit("@$margin_sym_name {$_newLine"); |
| 215 |
| 216 visitDeclarationGroup(node); |
| 217 |
| 218 emit("}$_newLine"); |
| 219 } |
| 220 |
| 221 void visitDeclaration(Declaration node) { |
| 222 String importantAsString() => node.important ? '$_sp!important' : ''; |
| 223 |
| 224 emit("${node.property}: "); |
| 225 node._expression.visit(this); |
| 226 |
| 227 emit("${importantAsString()}"); |
| 228 } |
| 229 |
| 230 void visitVarDefinition(VarDefinition node) { |
| 231 emit("var-${node.definedName}: "); |
| 232 node._expression.visit(this); |
| 233 } |
| 234 |
| 235 void visitSelectorGroup(SelectorGroup node) { |
| 236 var selectors = node._selectors; |
| 237 var selectorsLength = selectors.length; |
| 238 for (var i = 0; i < selectorsLength; i++) { |
| 239 if (i > 0) emit(',$_sp'); |
| 240 selectors[i].visit(this); |
| 241 } |
| 242 } |
| 243 |
| 244 void visitSimpleSelectorSequence(SimpleSelectorSequence node) { |
| 245 emit('${node._combinatorToString}'); |
| 246 node._selector.visit(this); |
| 247 } |
| 248 |
| 249 void visitSimpleSelector(SimpleSelector node) { |
| 250 emit(node.name); |
| 251 } |
| 252 |
| 253 void visitNamespaceSelector(NamespaceSelector node) { |
| 254 emit("${node.namespace}|${node.nameAsSimpleSelector.name}"); |
| 255 } |
| 256 |
| 257 void visitElementSelector(ElementSelector node) { |
| 258 emit("${node.name}"); |
| 259 } |
| 260 |
| 261 void visitAttributeSelector(AttributeSelector node) { |
| 262 emit("[${node.name}${node.matchOperator()}${node.valueToString()}]"); |
| 263 } |
| 264 |
| 265 void visitIdSelector(IdSelector node) { |
| 266 emit("#${node.name}"); |
| 267 } |
| 268 |
| 269 void visitClassSelector(ClassSelector node) { |
| 270 emit(".${node.name}"); |
| 271 } |
| 272 |
| 273 void visitPseudoClassSelector(PseudoClassSelector node) { |
| 274 emit(":${node.name}"); |
| 275 } |
| 276 |
| 277 void visitPseudoElementSelector(PseudoElementSelector node) { |
| 278 emit("::${node.name}"); |
| 279 } |
| 280 |
| 281 void visitPseudoClassFunctionSelector(PseudoClassFunctionSelector node) { |
| 282 emit(":${node.name}("); |
| 283 node.expression.visit(this); |
| 284 emit(')'); |
| 285 } |
| 286 |
| 287 void visitPseudoElementFunctionSelector(PseudoElementFunctionSelector node) { |
| 288 emit("::${node.name}("); |
| 289 node.expression.visit(this); |
| 290 emit(')'); |
| 291 } |
| 292 |
| 293 void visitNegationSelector(NegationSelector node) { |
| 294 emit(':not('); |
| 295 node.negationArg.visit(this); |
| 296 emit(')'); |
| 297 } |
| 298 |
| 299 void visitSelectorExpression(SelectorExpression node) { |
| 300 var expressions = node._expressions; |
| 301 var expressionsLength = expressions.length; |
| 302 for (var i = 0; i < expressionsLength; i++) { |
| 303 // Add space seperator between terms without an operator. |
| 304 var expression = expressions[i]; |
| 305 expression.visit(this); |
| 306 } |
| 307 } |
| 308 |
| 309 void visitUnicodeRangeTerm(UnicodeRangeTerm node) { |
| 310 if (node.hasSecond) { |
| 311 emit("U+${node.first}-${node.second}"); |
| 312 } else { |
| 313 emit("U+${node.first}"); |
| 314 } |
| 315 } |
| 316 |
| 317 void visitLiteralTerm(LiteralTerm node) { |
| 318 emit(node.text); |
| 319 } |
| 320 |
| 321 void visitHexColorTerm(HexColorTerm node) { |
| 322 var mappedName; |
| 323 if (_isTesting && (node.value is! BAD_HEX_VALUE)) { |
| 324 mappedName = TokenKind.hexToColorName(node.value); |
| 325 } |
| 326 if (mappedName == null) { |
| 327 mappedName = '#${node.text}'; |
| 328 } |
| 329 |
| 330 emit(mappedName); |
| 331 } |
| 332 |
| 333 void visitNumberTerm(NumberTerm node) { |
| 334 visitLiteralTerm(node); |
| 335 } |
| 336 |
| 337 void visitUnitTerm(UnitTerm node) { |
| 338 emit(node.toString()); |
| 339 } |
| 340 |
| 341 void visitLengthTerm(LengthTerm node) { |
| 342 emit(node.toString()); |
| 343 } |
| 344 |
| 345 void visitPercentageTerm(PercentageTerm node) { |
| 346 emit('${node.text}%'); |
| 347 } |
| 348 |
| 349 void visitEmTerm(EmTerm node) { |
| 350 emit('${node.text}em'); |
| 351 } |
| 352 |
| 353 void visitExTerm(ExTerm node) { |
| 354 emit('${node.text}ex'); |
| 355 } |
| 356 |
| 357 void visitAngleTerm(AngleTerm node) { |
| 358 emit(node.toString()); |
| 359 } |
| 360 |
| 361 void visitTimeTerm(TimeTerm node) { |
| 362 emit(node.toString()); |
| 363 } |
| 364 |
| 365 void visitFreqTerm(FreqTerm node) { |
| 366 emit(node.toString()); |
| 367 } |
| 368 |
| 369 void visitFractionTerm(FractionTerm node) { |
| 370 emit('${node.text}fr'); |
| 371 } |
| 372 |
| 373 void visitUriTerm(UriTerm node) { |
| 374 emit('url("${node.text}")'); |
| 375 } |
| 376 |
| 377 void visitResolutionTerm(ResolutionTerm node) { |
| 378 emit(node.toString()); |
| 379 } |
| 380 |
| 381 void visitViewportTerm(ViewportTerm node) { |
| 382 emit(node.toString()); |
| 383 } |
| 384 |
| 385 void visitFunctionTerm(FunctionTerm node) { |
| 386 // TODO(terry): Optimize rgb to a hexcolor. |
| 387 emit('${node.text}('); |
| 388 node._params.visit(this); |
| 389 emit(')'); |
| 390 } |
| 391 |
| 392 void visitGroupTerm(GroupTerm node) { |
| 393 emit('('); |
| 394 var terms = node._terms; |
| 395 var termsLength = terms.length; |
| 396 for (var i = 0; i < termsLength; i++) { |
| 397 if (i > 0) emit('$_sp'); |
| 398 terms[i].visit(this); |
| 399 } |
| 400 emit(')'); |
| 401 } |
| 402 |
| 403 void visitItemTerm(ItemTerm node) { |
| 404 emit('[${node.text}]'); |
| 405 } |
| 406 |
| 407 void visitIE8Term(IE8Term node) { |
| 408 visitLiteralTerm(node); |
| 409 } |
| 410 |
| 411 void visitOperatorSlash(OperatorSlash node) { |
| 412 emit('/'); |
| 413 } |
| 414 |
| 415 void visitOperatorComma(OperatorComma node) { |
| 416 emit(','); |
| 417 } |
| 418 |
| 419 void visitOperatorPlus(OperatorPlus node) { |
| 420 emit('+'); |
| 421 } |
| 422 |
| 423 void visitOperatorMinus(OperatorMinus node) { |
| 424 emit('-'); |
| 425 } |
| 426 |
| 427 void visitVarUsage(VarUsage node) { |
| 428 emit('var(${node.name}'); |
| 429 if (!node.defaultValues.isEmpty) { |
| 430 emit(','); |
| 431 for (var defaultValue in node.defaultValues) { |
| 432 emit(' '); |
| 433 defaultValue.visit(this); |
| 434 } |
| 435 } |
| 436 emit(')'); |
| 437 } |
| 438 |
| 439 void visitExpressions(Expressions node) { |
| 440 var expressions = node.expressions; |
| 441 var expressionsLength = expressions.length; |
| 442 for (var i = 0; i < expressionsLength; i++) { |
| 443 // Add space seperator between terms without an operator. |
| 444 // TODO(terry): Should have a BinaryExpression to solve this problem. |
| 445 var expression = expressions[i]; |
| 446 if (i > 0 && |
| 447 !(expression is OperatorComma || expression is OperatorSlash)) { |
| 448 emit(' '); |
| 449 } |
| 450 expression.visit(this); |
| 451 } |
| 452 } |
| 453 |
| 454 void visitBinaryExpression(BinaryExpression node) { |
| 455 // TODO(terry): TBD |
| 456 throw UnimplementedError; |
| 457 } |
| 458 |
| 459 void visitUnaryExpression(UnaryExpression node) { |
| 460 // TODO(terry): TBD |
| 461 throw UnimplementedError; |
| 462 } |
| 463 |
| 464 void visitIdentifier(Identifier node) { |
| 465 emit(node.name); |
| 466 } |
| 467 |
| 468 void visitWildcard(Wildcard node) { |
| 469 emit('*'); |
| 470 } |
| 471 |
| 472 void visitDartStyleExpression(DartStyleExpression node) { |
| 473 // TODO(terry): TBD |
| 474 throw UnimplementedError; |
| 475 } |
| 476 } |
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