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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 library csslib.parser; | 5 library csslib.parser; |
6 | 6 |
7 import 'dart:math' as math; | 7 import 'dart:math' as math; |
8 | 8 |
9 import 'package:source_span/source_span.dart'; | 9 import 'package:source_span/source_span.dart'; |
10 | 10 |
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2181 _error('Expecting a positive number', _makeSpan(start)); | 2181 _error('Expecting a positive number', _makeSpan(start)); |
2182 } | 2182 } |
2183 | 2183 |
2184 _eat(TokenKind.RBRACK); | 2184 _eat(TokenKind.RBRACK); |
2185 | 2185 |
2186 return new ItemTerm(term.value, term.text, _makeSpan(start)); | 2186 return new ItemTerm(term.value, term.text, _makeSpan(start)); |
2187 case TokenKind.IDENTIFIER: | 2187 case TokenKind.IDENTIFIER: |
2188 var nameValue = identifier(); // Snarf up the ident we'll remap, maybe. | 2188 var nameValue = identifier(); // Snarf up the ident we'll remap, maybe. |
2189 | 2189 |
2190 if (!ieFilter && _maybeEat(TokenKind.LPAREN)) { | 2190 if (!ieFilter && _maybeEat(TokenKind.LPAREN)) { |
| 2191 var calc = processCalc(nameValue); |
| 2192 if (calc != null) return calc; |
2191 // FUNCTION | 2193 // FUNCTION |
2192 return processFunction(nameValue); | 2194 return processFunction(nameValue); |
2193 } | 2195 } |
2194 if (ieFilter) { | 2196 if (ieFilter) { |
2195 if (_maybeEat(TokenKind.COLON) && | 2197 if (_maybeEat(TokenKind.COLON) && |
2196 nameValue.name.toLowerCase() == 'progid') { | 2198 nameValue.name.toLowerCase() == 'progid') { |
2197 // IE filter:progid: | 2199 // IE filter:progid: |
2198 return processIEFilter(start); | 2200 return processIEFilter(start); |
2199 } else { | 2201 } else { |
2200 // Handle filter:<name> where name is any filter e.g., alpha, chroma
, | 2202 // Handle filter:<name> where name is any filter e.g., alpha, chroma
, |
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2435 startAfterProgidColon.start.offset, _peekToken.start); | 2437 startAfterProgidColon.start.offset, _peekToken.start); |
2436 return new LiteralTerm(tok.text, tok.text, tok.span); | 2438 return new LiteralTerm(tok.text, tok.text, tok.span); |
2437 } | 2439 } |
2438 break; | 2440 break; |
2439 default: | 2441 default: |
2440 _eat(_peek()); | 2442 _eat(_peek()); |
2441 } | 2443 } |
2442 } | 2444 } |
2443 } | 2445 } |
2444 | 2446 |
| 2447 // TODO(terry): Hack to gobble up the calc expression as a string looking |
| 2448 // for the matching RPAREN the expression is not parsed into the |
| 2449 // AST. |
| 2450 // |
| 2451 // grammar should be: |
| 2452 // |
| 2453 // <calc()> = calc( <calc-sum> ) |
| 2454 // <calc-sum> = <calc-product> [ [ '+' | '-' ] <calc-product> ]* |
| 2455 // <calc-product> = <calc-value> [ '*' <calc-value> | '/' <number> ]* |
| 2456 // <calc-value> = <number> | <dimension> | <percentage> | ( <calc-sum> ) |
| 2457 // |
| 2458 String processCalcExpression() { |
| 2459 var inString = tokenizer._inString; |
| 2460 tokenizer._inString = false; |
| 2461 |
| 2462 // Gobble up everything until we hit our stop token. |
| 2463 var stringValue = new StringBuffer(); |
| 2464 var left = 1; |
| 2465 var matchingParens = false; |
| 2466 while (_peek() != TokenKind.END_OF_FILE && !matchingParens) { |
| 2467 var token = _peek(); |
| 2468 if (token == TokenKind.LPAREN) |
| 2469 left++; |
| 2470 else if (token == TokenKind.RPAREN) |
| 2471 left--; |
| 2472 |
| 2473 matchingParens = left == 0; |
| 2474 if (!matchingParens) stringValue.write(_next().text); |
| 2475 } |
| 2476 |
| 2477 if (!matchingParens) { |
| 2478 _error("problem parsing function expected ), ", _peekToken.span); |
| 2479 } |
| 2480 |
| 2481 tokenizer._inString = inString; |
| 2482 |
| 2483 return stringValue.toString(); |
| 2484 } |
| 2485 |
| 2486 CalcTerm processCalc(Identifier func) { |
| 2487 var start = _peekToken.span; |
| 2488 |
| 2489 var name = func.name; |
| 2490 if (name == 'calc') { |
| 2491 // TODO(terry): Implement expression parsing properly. |
| 2492 String expression = processCalcExpression(); |
| 2493 var calcExpr = new LiteralTerm(expression, expression, _makeSpan(start)); |
| 2494 |
| 2495 if (!_maybeEat(TokenKind.RPAREN)) { |
| 2496 _error("problem parsing function expected ), ", _peekToken.span); |
| 2497 } |
| 2498 |
| 2499 return new CalcTerm(name, name, calcExpr, _makeSpan(start)); |
| 2500 } |
| 2501 |
| 2502 return null; |
| 2503 } |
| 2504 |
2445 // Function grammar: | 2505 // Function grammar: |
2446 // | 2506 // |
2447 // function: IDENT '(' expr ')' | 2507 // function: IDENT '(' expr ')' |
2448 // | 2508 // |
2449 processFunction(Identifier func) { | 2509 processFunction(Identifier func) { |
2450 var start = _peekToken.span; | 2510 var start = _peekToken.span; |
2451 | 2511 |
2452 var name = func.name; | 2512 var name = func.name; |
2453 | 2513 |
2454 switch (name) { | 2514 switch (name) { |
2455 case 'url': | 2515 case 'url': |
2456 // URI term sucks up everything inside of quotes(' or ") or between pare
ns | 2516 // URI term sucks up everything inside of quotes(' or ") or between pare
ns |
2457 var urlParam = processQuotedString(true); | 2517 var urlParam = processQuotedString(true); |
2458 | 2518 |
2459 // TODO(terry): Better error messge and checking for mismatched quotes. | 2519 // TODO(terry): Better error messge and checking for mismatched quotes. |
2460 if (_peek() == TokenKind.END_OF_FILE) { | 2520 if (_peek() == TokenKind.END_OF_FILE) { |
2461 _error("problem parsing URI", _peekToken.span); | 2521 _error("problem parsing URI", _peekToken.span); |
2462 } | 2522 } |
2463 | 2523 |
2464 if (_peek() == TokenKind.RPAREN) { | 2524 if (_peek() == TokenKind.RPAREN) { |
2465 _next(); | 2525 _next(); |
2466 } | 2526 } |
2467 | 2527 |
2468 return new UriTerm(urlParam, _makeSpan(start)); | 2528 return new UriTerm(urlParam, _makeSpan(start)); |
2469 case 'calc': | |
2470 // TODO(terry): Implement expression handling... | |
2471 break; | |
2472 case 'var': | 2529 case 'var': |
2473 // TODO(terry): Consider handling var in IE specific filter/progid. Thi
s | 2530 // TODO(terry): Consider handling var in IE specific filter/progid. Thi
s |
2474 // will require parsing entire IE specific syntax e.g., | 2531 // will require parsing entire IE specific syntax e.g., |
2475 // param = value or progid:com_id, etc. for example: | 2532 // param = value or progid:com_id, etc. for example: |
2476 // | 2533 // |
2477 // var-blur: Blur(Add = 0, Direction = 225, Strength = 10); | 2534 // var-blur: Blur(Add = 0, Direction = 225, Strength = 10); |
2478 // var-gradient: progid:DXImageTransform.Microsoft.gradient" | 2535 // var-gradient: progid:DXImageTransform.Microsoft.gradient" |
2479 // (GradientType=0,StartColorStr='#9d8b83', EndColorStr='#847670'); | 2536 // (GradientType=0,StartColorStr='#9d8b83', EndColorStr='#847670'); |
2480 var expr = processExpr(); | 2537 var expr = processExpr(); |
2481 if (!_maybeEat(TokenKind.RPAREN)) { | 2538 if (!_maybeEat(TokenKind.RPAREN)) { |
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2689 | 2746 |
2690 if (replace != null && result == null) { | 2747 if (replace != null && result == null) { |
2691 result = new StringBuffer(text.substring(0, i)); | 2748 result = new StringBuffer(text.substring(0, i)); |
2692 } | 2749 } |
2693 | 2750 |
2694 if (result != null) result.write(replace != null ? replace : text[i]); | 2751 if (result != null) result.write(replace != null ? replace : text[i]); |
2695 } | 2752 } |
2696 | 2753 |
2697 return result == null ? text : result.toString(); | 2754 return result == null ? text : result.toString(); |
2698 } | 2755 } |
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