A Parser for CSS Files written in PHP. Allows extraction of CSS files into a data structure, manipulation of said structure and output as (optimized) CSS

Last update: Jul 28, 2022

PHP CSS Parser

Build Status

A Parser for CSS Files written in PHP. Allows extraction of CSS files into a data structure, manipulation of said structure and output as (optimized) CSS.

Usage

Installation using composer

Add php-css-parser to your composer.json

{
    "require": {
        "sabberworm/php-css-parser": "*"
    }
}

Extraction

To use the CSS Parser, create a new instance. The constructor takes the following form:

new Sabberworm\CSS\Parser($sText);

To read a file, for example, you’d do the following:

$oCssParser = new Sabberworm\CSS\Parser(file_get_contents('somefile.css'));
$oCssDocument = $oCssParser->parse();

The resulting CSS document structure can be manipulated prior to being output.

Options

Charset

The charset option is used only if no @charset declaration is found in the CSS file. UTF-8 is the default, so you won’t have to create a settings object at all if you don’t intend to change that.

$oSettings = Sabberworm\CSS\Settings::create()->withDefaultCharset('windows-1252');
new Sabberworm\CSS\Parser($sText, $oSettings);

Strict parsing

To have the parser choke on invalid rules, supply a thusly configured Sabberworm\CSS\Settings object:

$oCssParser = new Sabberworm\CSS\Parser(file_get_contents('somefile.css'), Sabberworm\CSS\Settings::create()->beStrict());

Disable multibyte functions

To achieve faster parsing, you can choose to have PHP-CSS-Parser use regular string functions instead of mb_* functions. This should work fine in most cases, even for UTF-8 files, as all the multibyte characters are in string literals. Still it’s not recommended to use this with input you have no control over as it’s not thoroughly covered by test cases.

$oSettings = Sabberworm\CSS\Settings::create()->withMultibyteSupport(false);
new Sabberworm\CSS\Parser($sText, $oSettings);

Manipulation

The resulting data structure consists mainly of five basic types: CSSList, RuleSet, Rule, Selector and Value. There are two additional types used: Import and Charset which you won’t use often.

CSSList

CSSList represents a generic CSS container, most likely containing declaration blocks (rule sets with a selector) but it may also contain at-rules, charset declarations, etc. CSSList has the following concrete subtypes:

  • Document – representing the root of a CSS file.
  • MediaQuery – represents a subsection of a CSSList that only applies to a output device matching the contained media query.

To access the items stored in a CSSList – like the document you got back when calling $oCssParser->parse() –, use getContents(), then iterate over that collection and use instanceof to check whether you’re dealing with another CSSList, a RuleSet, a Import or a Charset.

To append a new item (selector, media query, etc.) to an existing CSSList, construct it using the constructor for this class and use the append($oItem) method.

RuleSet

RuleSet is a container for individual rules. The most common form of a rule set is one constrained by a selector. The following concrete subtypes exist:

  • AtRuleSet – for generic at-rules which do not match the ones specifically mentioned like @import, @charset or @media. A common example for this is @font-face.
  • DeclarationBlock – a RuleSet constrained by a Selector; contains an array of selector objects (comma-separated in the CSS) as well as the rules to be applied to the matching elements.

Note: A CSSList can contain other CSSLists (and Imports as well as a Charset) while a RuleSet can only contain Rules.

If you want to manipulate a RuleSet, use the methods addRule(Rule $oRule), getRules() and removeRule($mRule) (which accepts either a Rule instance or a rule name; optionally suffixed by a dash to remove all related rules).

Rule

Rules just have a key (the rule) and a value. These values are all instances of a Value.

Value

Value is an abstract class that only defines the render method. The concrete subclasses for atomic value types are:

  • Size – consists of a numeric size value and a unit.
  • Color – colors can be input in the form #rrggbb, #rgb or schema(val1, val2, …) but are always stored as an array of ('s' => val1, 'c' => val2, 'h' => val3, …) and output in the second form.
  • CSSString – this is just a wrapper for quoted strings to distinguish them from keywords; always output with double quotes.
  • URL – URLs in CSS; always output in URL("") notation.

There is another abstract subclass of Value, ValueList. A ValueList represents a lists of Values, separated by some separation character (mostly ,, whitespace, or /). There are two types of ValueLists:

  • RuleValueList – The default type, used to represent all multi-valued rules like font: bold 12px/3 Helvetica, Verdana, sans-serif; (where the value would be a whitespace-separated list of the primitive value bold, a slash-separated list and a comma-separated list).
  • CSSFunction – A special kind of value that also contains a function name and where the values are the function’s arguments. Also handles equals-sign-separated argument lists like filter: alpha(opacity=90);.

Convenience methods

There are a few convenience methods on Document to ease finding, manipulating and deleting rules:

  • getAllDeclarationBlocks() – does what it says; no matter how deeply nested your selectors are. Aliased as getAllSelectors().
  • getAllRuleSets() – does what it says; no matter how deeply nested your rule sets are.
  • getAllValues() – finds all Value objects inside Rules.

To-Do

  • More convenience methods [like selectorsWithElement($sId/Class/TagName), attributesOfType($sType), removeAttributesOfType($sType)]
  • Real multibyte support. Currently only multibyte charsets whose first 255 code points take up only one byte and are identical with ASCII are supported (yes, UTF-8 fits this description).
  • Named color support (using Color instead of an anonymous string literal)

Use cases

Use Parser to prepend an id to all selectors

$sMyId = "#my_id";
$oParser = new Sabberworm\CSS\Parser($sText);
$oCss = $oParser->parse();
foreach($oCss->getAllDeclarationBlocks() as $oBlock) {
	foreach($oBlock->getSelectors() as $oSelector) {
		//Loop over all selector parts (the comma-separated strings in a selector) and prepend the id
		$oSelector->setSelector($sMyId.' '.$oSelector->getSelector());
	}
}

Shrink all absolute sizes to half

$oParser = new Sabberworm\CSS\Parser($sText);
$oCss = $oParser->parse();
foreach($oCss->getAllValues() as $mValue) {
	if($mValue instanceof CSSSize && !$mValue->isRelative()) {
		$mValue->setSize($mValue->getSize()/2);
	}
}

Remove unwanted rules

$oParser = new Sabberworm\CSS\Parser($sText);
$oCss = $oParser->parse();
foreach($oCss->getAllRuleSets() as $oRuleSet) {
	$oRuleSet->removeRule('font-'); //Note that the added dash will make this remove all rules starting with font- (like font-size, font-weight, etc.) as well as a potential font-rule
	$oRuleSet->removeRule('cursor');
}

Output

To output the entire CSS document into a variable, just use ->render():

$oCssParser = new Sabberworm\CSS\Parser(file_get_contents('somefile.css'));
$oCssDocument = $oCssParser->parse();
print $oCssDocument->render();

If you want to format the output, pass an instance of type Sabberworm\CSS\OutputFormat:

$oFormat = Sabberworm\CSS\OutputFormat::create()->indentWithSpaces(4)->setSpaceBetweenRules("\n");
print $oCssDocument->render($oFormat);

Or use one of the predefined formats:

print $oCssDocument->render(Sabberworm\CSS\OutputFormat::createPretty());
print $oCssDocument->render(Sabberworm\CSS\OutputFormat::createCompact());

To see what you can do with output formatting, look at the tests in tests/Sabberworm/CSS/OutputFormatTest.php.

Examples

Example 1 (At-Rules)

Input

@charset "utf-8";

@font-face {
  font-family: "CrassRoots";
  src: url("../media/cr.ttf")
}

html, body {
    font-size: 1.6em
}

@keyframes mymove {
	from { top: 0px; }
	to { top: 200px; }
}

Structure (var_dump())

class Sabberworm\CSS\CSSList\Document#4 (2) {
  protected $aContents =>
  array(4) {
    [0] =>
    class Sabberworm\CSS\Property\Charset#6 (2) {
      private $sCharset =>
      class Sabberworm\CSS\Value\CSSString#5 (2) {
        private $sString =>
        string(5) "utf-8"
        protected $iLineNo =>
        int(1)
      }
      protected $iLineNo =>
      int(1)
    }
    [1] =>
    class Sabberworm\CSS\RuleSet\AtRuleSet#7 (4) {
      private $sType =>
      string(9) "font-face"
      private $sArgs =>
      string(0) ""
      private $aRules =>
      array(2) {
        'font-family' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#8 (4) {
            private $sRule =>
            string(11) "font-family"
            private $mValue =>
            class Sabberworm\CSS\Value\CSSString#9 (2) {
              private $sString =>
              string(10) "CrassRoots"
              protected $iLineNo =>
              int(4)
            }
            private $bIsImportant =>
            bool(false)
            protected $iLineNo =>
            int(4)
          }
        }
        'src' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#10 (4) {
            private $sRule =>
            string(3) "src"
            private $mValue =>
            class Sabberworm\CSS\Value\URL#11 (2) {
              private $oURL =>
              class Sabberworm\CSS\Value\CSSString#12 (2) {
                private $sString =>
                string(15) "../media/cr.ttf"
                protected $iLineNo =>
                int(5)
              }
              protected $iLineNo =>
              int(5)
            }
            private $bIsImportant =>
            bool(false)
            protected $iLineNo =>
            int(5)
          }
        }
      }
      protected $iLineNo =>
      int(3)
    }
    [2] =>
    class Sabberworm\CSS\RuleSet\DeclarationBlock#13 (3) {
      private $aSelectors =>
      array(2) {
        [0] =>
        class Sabberworm\CSS\Property\Selector#14 (2) {
          private $sSelector =>
          string(4) "html"
          private $iSpecificity =>
          NULL
        }
        [1] =>
        class Sabberworm\CSS\Property\Selector#15 (2) {
          private $sSelector =>
          string(4) "body"
          private $iSpecificity =>
          NULL
        }
      }
      private $aRules =>
      array(1) {
        'font-size' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#16 (4) {
            private $sRule =>
            string(9) "font-size"
            private $mValue =>
            class Sabberworm\CSS\Value\Size#17 (4) {
              private $fSize =>
              double(1.6)
              private $sUnit =>
              string(2) "em"
              private $bIsColorComponent =>
              bool(false)
              protected $iLineNo =>
              int(9)
            }
            private $bIsImportant =>
            bool(false)
            protected $iLineNo =>
            int(9)
          }
        }
      }
      protected $iLineNo =>
      int(8)
    }
    [3] =>
    class Sabberworm\CSS\CSSList\KeyFrame#18 (4) {
      private $vendorKeyFrame =>
      string(9) "keyframes"
      private $animationName =>
      string(6) "mymove"
      protected $aContents =>
      array(2) {
        [0] =>
        class Sabberworm\CSS\RuleSet\DeclarationBlock#19 (3) {
          private $aSelectors =>
          array(1) {
            [0] =>
            class Sabberworm\CSS\Property\Selector#20 (2) {
              private $sSelector =>
              string(4) "from"
              private $iSpecificity =>
              NULL
            }
          }
          private $aRules =>
          array(1) {
            'top' =>
            array(1) {
              [0] =>
              class Sabberworm\CSS\Rule\Rule#21 (4) {
                private $sRule =>
                string(3) "top"
                private $mValue =>
                class Sabberworm\CSS\Value\Size#22 (4) {
                  private $fSize =>
                  double(0)
                  private $sUnit =>
                  string(2) "px"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(13)
                }
                private $bIsImportant =>
                bool(false)
                protected $iLineNo =>
                int(13)
              }
            }
          }
          protected $iLineNo =>
          int(13)
        }
        [1] =>
        class Sabberworm\CSS\RuleSet\DeclarationBlock#23 (3) {
          private $aSelectors =>
          array(1) {
            [0] =>
            class Sabberworm\CSS\Property\Selector#24 (2) {
              private $sSelector =>
              string(2) "to"
              private $iSpecificity =>
              NULL
            }
          }
          private $aRules =>
          array(1) {
            'top' =>
            array(1) {
              [0] =>
              class Sabberworm\CSS\Rule\Rule#25 (4) {
                private $sRule =>
                string(3) "top"
                private $mValue =>
                class Sabberworm\CSS\Value\Size#26 (4) {
                  private $fSize =>
                  double(200)
                  private $sUnit =>
                  string(2) "px"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(14)
                }
                private $bIsImportant =>
                bool(false)
                protected $iLineNo =>
                int(14)
              }
            }
          }
          protected $iLineNo =>
          int(14)
        }
      }
      protected $iLineNo =>
      int(12)
    }
  }
  protected $iLineNo =>
  int(1)
}

Output (render())

@charset "utf-8";
@font-face {font-family: "CrassRoots";src: url("../media/cr.ttf");}
html, body {font-size: 1.6em;}
@keyframes mymove {from {top: 0px;}
	to {top: 200px;}}

Example 2 (Values)

Input

#header {
	margin: 10px 2em 1cm 2%;
	font-family: Verdana, Helvetica, "Gill Sans", sans-serif;
	color: red !important;
}

Structure (var_dump())

class Sabberworm\CSS\CSSList\Document#4 (2) {
  protected $aContents =>
  array(1) {
    [0] =>
    class Sabberworm\CSS\RuleSet\DeclarationBlock#5 (3) {
      private $aSelectors =>
      array(1) {
        [0] =>
        class Sabberworm\CSS\Property\Selector#6 (2) {
          private $sSelector =>
          string(7) "#header"
          private $iSpecificity =>
          NULL
        }
      }
      private $aRules =>
      array(3) {
        'margin' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#7 (4) {
            private $sRule =>
            string(6) "margin"
            private $mValue =>
            class Sabberworm\CSS\Value\RuleValueList#12 (3) {
              protected $aComponents =>
              array(4) {
                [0] =>
                class Sabberworm\CSS\Value\Size#8 (4) {
                  private $fSize =>
                  double(10)
                  private $sUnit =>
                  string(2) "px"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(2)
                }
                [1] =>
                class Sabberworm\CSS\Value\Size#9 (4) {
                  private $fSize =>
                  double(2)
                  private $sUnit =>
                  string(2) "em"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(2)
                }
                [2] =>
                class Sabberworm\CSS\Value\Size#10 (4) {
                  private $fSize =>
                  double(1)
                  private $sUnit =>
                  string(2) "cm"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(2)
                }
                [3] =>
                class Sabberworm\CSS\Value\Size#11 (4) {
                  private $fSize =>
                  double(2)
                  private $sUnit =>
                  string(1) "%"
                  private $bIsColorComponent =>
                  bool(false)
                  protected $iLineNo =>
                  int(2)
                }
              }
              protected $sSeparator =>
              string(1) " "
              protected $iLineNo =>
              int(2)
            }
            private $bIsImportant =>
            bool(false)
            protected $iLineNo =>
            int(2)
          }
        }
        'font-family' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#13 (4) {
            private $sRule =>
            string(11) "font-family"
            private $mValue =>
            class Sabberworm\CSS\Value\RuleValueList#15 (3) {
              protected $aComponents =>
              array(4) {
                [0] =>
                string(7) "Verdana"
                [1] =>
                string(9) "Helvetica"
                [2] =>
                class Sabberworm\CSS\Value\CSSString#14 (2) {
                  private $sString =>
                  string(9) "Gill Sans"
                  protected $iLineNo =>
                  int(3)
                }
                [3] =>
                string(10) "sans-serif"
              }
              protected $sSeparator =>
              string(1) ","
              protected $iLineNo =>
              int(3)
            }
            private $bIsImportant =>
            bool(false)
            protected $iLineNo =>
            int(3)
          }
        }
        'color' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#16 (4) {
            private $sRule =>
            string(5) "color"
            private $mValue =>
            string(3) "red"
            private $bIsImportant =>
            bool(true)
            protected $iLineNo =>
            int(4)
          }
        }
      }
      protected $iLineNo =>
      int(1)
    }
  }
  protected $iLineNo =>
  int(1)
}

Output (render())

#header {margin: 10px 2em 1cm 2%;font-family: Verdana,Helvetica,"Gill Sans",sans-serif;color: red !important;}

Contributors/Thanks to

Misc

  • Legacy Support: The latest pre-PSR-0 version of this project can be checked with the 0.9.0 tag.
  • Running Tests: To run all unit tests for this project, run composer install to install phpunit and use ./vendor/phpunit/phpunit/phpunit.

License

PHP-CSS-Parser is freely distributable under the terms of an MIT-style license.

Copyright (c) 2011 Raphael Schweikert, http://sabberworm.com/

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

GitHub

https://github.com/sabberworm/PHP-CSS-Parser
Comments
  • 1. Add line number support in the sabberworm CSS parser

    AMP HTML is a restricted subset of HTML (See https://www.ampproject.org/ for more details) and the AMP PHP Library provide validation and HTML to AMP HTML conversion utilities. We're using the masterminds/html5-php library to parse HTML5 and we're using sabberworm/php-css-parser to parse the CSS in the AMP PHP Library

    After parsing the CSS parse we report any problems in the CSS (for e.g. !important is disallowed in the AMP dialect of HTML, we use the sabberworm parser to find all the uses of !important for instance)

    Now the CSS supplied by the user could be hundreds / thousands of lines long. So its not useful to simply say that !important was used and is not allowed. We should be able to say which line the problem occurred.

    This pull request adds support for line numbers. Here is how we're using this https://github.com/Lullabot/amp-library/pull/80#issuecomment-222695630 Notice the line numbers reported in the validation errors which coming from code submitted in this PR.

    Would greatly appreciate if you had a look and merge it if you believe this feature would be useful. Hopefully the code changes have not missed anything out.

    Thanks for this useful library BTW.

    Reviewed by sidkshatriya at 2016-06-29 15:24
  • 2. Support CSS3 calc()

    Following document throws Sabberworm\CSS\Parsing\UnexpectedTokenException with message Identifier expected. Got “+ 20p”. This is expected to be valid CSS document:

    body
    {
        border-top: solid green 0em;
        border-top-width: calc(1em + 20px);
    }
    

    The parser is initialized like this:

    $settings = Sabberworm\CSS\Settings::create();
    $settings->beStrict();
    $parser = new Sabberworm\CSS\Parser($css, $settings);
    

    I think Parser::parseValue() would need to be modified but I have no idea how to fix this.

    Reviewed by mikkorantalainen at 2014-07-03 09:46
  • 3. added support for merging imported stylesheets

    This commit allows to resolve @import rules, merging their declarations into the main stylesheet. Required a few changes to the API, see the comments.

    Reviewed by ju1ius at 2011-09-10 01:18
  • 4. CSSRule->__toString doesn't work with sized values

    If I have a CSS rule as follows (this is in your example css): div.rating-cancel,div.star-rating{width:17px;height:15px;}

    The CSSRule->__toString either throws an error, or it looks like this: width: Object;

    The problem is on line 707 when it tries to implode a comma into the values. When a value is a CSSSize, it produces the above result.

    For you to test this, in your CSSParserTests.php file, change line 19 to: $oDoc = $oParser->parse(); and add this line after the catch clause echo $oDoc->__toString();

    Reviewed by lieutdan13 at 2010-12-22 17:28
  • 5. retain CSSList and Rule comments when rendering CSS

    Hi, was banging my head against the wall as my css comments would vanish when using a autoprefixer repo that utilizes this repo. Found out that the issue was that comments are only partly implemented in this repo: they are recognized, but when rendering the parsed css code they are not added back.

    So I rolled up my sleeves and did this PR.

    This PR does two things:

    1. fix the comments implementation as only the first comments where taken and not the subsequent comments in a CSSList
    2. adds the comments back into the rendered CSS (as also requested in #38 )

    So this is my first PR in this repo, would love to have some feedback / discussion / tests :)

    Thanks in advance, regards, Ruud

    Reviewed by Ruud68 at 2021-12-23 15:45
  • 6. How to remove @import

    Hi,

    Just like

    foreach($oCssDocument->getAllRuleSets() as $oRuleSet) {
    	$oRuleSet->removeRule('-moz-binding');
    	$oRuleSet->removeRule('behavior');
    	$oRuleSet->removeRule('background-image');
    	$oRuleSet->removeRule('xss');
    }
    

    Can we remove @import url("chrome://communicator/skin/"); line via removeRule ?

    Reviewed by teckkid at 2018-10-10 04:46
  • 7. Lacks PHP v8.1 compatibility

    PHP v8.1 (currently a release candidate) deprecates several parameter types and throws warnings such as Deprecated: preg_split(): Passing null to parameter #3 ($limit) of type int is deprecated in PHP-CSS-Parser\lib\Sabberworm\CSS\Parsing\ParserState.php on line 285

    Reviewed by dleffler at 2021-09-08 16:27
  • 8. Drop support for older PHP versions

    I propose this library drops support for older PHP versions so it can use newer PHP features.

    According to https://www.php.net/supported-versions.php, PHP 7.2 recently reached its end of life. So I propose to drop support for all PHP versions < 7.2.

    (We then can use Rector to upgrade the code accordingly.)

    What do you think?

    Reviewed by oliverklee at 2021-04-18 10:58
  • 9. Selector validation

    The way we currently detect extra closing block brackets } is not perfect and still causes issues, because we just ignore them. This however does not match the browsers' behavior. Depending on the case the extra closing brackets might end up as part of the selector. Take a look at the following:

    @keyframes mymove {
      from { top: 0px; }
    }
    
    #test {
      color: white;
      background: green;
    }
    
    body
      background: black;
      }
    
    #test {
      display: block;
      background: red;
      color: white;
    }
    #test {
      display: block;
      background: white;
      color: black;
    }
    

    The body selector is missing an opening { so the selector string will be everything up to the next { found at the first #test { declaration. This makes the selector invalid, so the first definition of #test must be skipped, but parsing must continue. The final tree must include the @keyframes, first #test definition and the last #test definition. The rules in between must be skipped.

    This is why I think we should have a selector validation and skip the rule sets for invalid selectors (which matches the browsers' behavior).

    The modifications in this PR will change the output of the library, so this change might be considered BC breaking, but I believe it is a move in the right direction. I tried to build the selector validation according to the definition found in this document. More specifically this line In CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, plus the hyphen (-) and the underscore (_);. It is not perfect yet, because it doesn't check for escaped characters, or a valid start of the selector. I might try to add these if we agree that this is a viable approach to the problem.

    Let me know what you think.

    Reviewed by raxbg at 2019-02-25 11:03
  • 10. unicode-range is not parsed

    I try to parse this below mentioned font-face, unicode-range is missing in output.. INPUT: @font-face { font-family: 'specialCharacters'; src: url('/fonts/some.otf') format('truetype'); unicode-range: U+26; font-weight: normal; font-style: normal; }

    OUTPUT: @font-face {font-family: "specialCharacters";src: url("/fonts/some.otf") format("truetype");font-weight: normal;font-style: normal;}

    Is there any solution for this ?

    Reviewed by aruntvr at 2019-02-07 13:27
  • 11. Nested calc() values are not parsed

    Nested calc values are used in Bootstrap 4 on things like tooltips, for example:

    .testclass1 {
        bottom: calc(( 0.5rem - 1px ) * -1);
    }
    

    The php css parser seems to ignore these.

    #79 has fixed calc values for subtraction, would supporting nesting be possible too?

    Reviewed by bmbrands at 2018-08-20 15:39
  • 12. GitHub releases page not up to date with tags (missing 8.4.0)

    Please see https://github.com/sabberworm/PHP-CSS-Parser/releases/

    8.4.0 was tagged December 2021, but not yet on GitHub releases page - not obvious there's an 8.4.0 when visiting repo's homepage.

    Suggest to create release for 8.4.0

    Reviewed by leonstafford at 2022-05-26 02:38
  • 13. Selectors inside :not() not correctly parsed

    .test:not(.a, .b) { display: none; }

    will be parsed as:

    Sabberworm\CSS\RuleSet\DeclarationBlock -> getSelectors():
      Sabberworm\CSS\Property\Selector '.test:not(.a',
      Sabberworm\CSS\Property\Selector '.b)'
    
    Reviewed by MichaelRoosz at 2022-04-01 14:49
  • 14. Trying to reproduce a bug on php 8+ related to lenient parsing of invalid colors (at least)

    We are getting warnings with some CSS code even on lenient mode on php 8.1 (but the same also happens on php 8.0)

    Warning: Uninitialized string offset 5 in /app/src/Value/Color.php on line 56

    Reviewed by mathroc at 2022-03-22 17:18
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