PHP CSS Parser

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

composer 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($css);

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

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

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

Options

Charset

The charset option will only be used if the CSS file does not contain an @charset declaration. 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.

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

Strict parsing

To have the parser throw an exception when encountering invalid/unknown constructs (as opposed to trying to ignore them and carry on parsing), supply a thusly configured \Sabberworm\CSS\Settings object:

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

Note that this will also disable a workaround for parsing the unquoted variant of the legacy IE-specific filter rule.

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 using this with input you have no control over as it’s not thoroughly covered by test cases.

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

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.

To access the items stored in a CSSList – like the document you got back when calling $parser->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 for generic at-rules which are not covered by specific classes, i.e., not @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 $rule), getRules() and removeRule($rule) (which accepts either a Rule or a rule name; optionally suffixed by a dash to remove all related rules).

Rule

Rules just have a string key (the rule) and 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 multivalued 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 the selectors are. Aliased as getAllSelectors().
getAllRuleSets() – does what it says; no matter how deeply nested the rule sets are.
getAllValues() – finds all Value objects inside Rules.

To-Do

More convenience methods (like selectorsWithElement($sId/Class/TagName), attributesOfType($type), removeAttributesOfType($type))
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)

Preloading

In environments where file caching / preloading is being used, you may encounter a "double declaration" exception, similar to:

NOTICE: PHP message: Exception [/var/www/html/vendor/thecodingmachine/safe/generated/Exceptions/ClassobjException.php: 9]: Cannot redeclare class Sabberworm\CSS\Rule\Rule (previously declared in /var/www/html/vendor/sabberworm/php-css-parser/src/Property/Declaration.php:27)

Traceback: 
#0 /var/www/html/vendor/thecodingmachine/safe/generated/8.1/classobj.php(19): Safe\Exceptions\ClassobjException::createFromPhpError()
#1 /var/www/html/vendor/sabberworm/php-css-parser/src/Rule/Rule.php(14): Safe\class_alias('Sabberworm\\CSS\\...', 'Sabberworm\\CSS\\...')
#2 /var/www/html/vendor/composer/autoload_real.php(41): require('/var/www/html/v...')
#3 /var/www/html/vendor/composer/autoload_real.php(45): {closure:ComposerAutoloaderInita513f45a21088ff88ff9a0ececb2b3ac::getLoader():37}('0174385c3be07e8...', '/var/www/html/v...')
#4 /var/www/html/vendor/autoload.php(22): ComposerAutoloaderInita513f45a21088ff88ff9a0ececb2b3ac::getLoader()

This relates to this issues:

1546 - MyIntervals#1546

11102 - composer/composer#11102

This is most likely to occur in environments where OPCache or other file caching featuers are being used. For example, when running behind a web server.

Unfortunately this behavior appears to be rooted in the PHP Composer autoload code itself. While you can try to avoid the problem, you may ultimately have to patch your autoload files to fully resolve the issue. There are a couple of class files that get added directly to the Composer autoload files, and becuase of he way Composer itself loads files...you can hit the "double declaration" even if you aren't directly including any files from the PHP CSS Parser. It happens by way of the autoload system itself transitively loading everything it thinks it needs.

To avoid the excpetion:

Don't use file caching if you don't have to.
If you ae doing preloading, do not include PHP CSS Parser files/folders in your preload script (opcache.preload)
Don't require composer's autoload file inside your preload script if you don't have to (vendor/autoload.php)
Add PHP CSS Parser files/folder to the preloading blacklist (opcache.blacklist_filename)
Double check that within your preload script you are only using require_once() and neve rusing require()

If you still see the exception, then you can patch the Composer autoload files to not directly load the classes involved in the exception. The reason those classes end up being added directly is to make them visible for code analysis toolts (like PHPStan), but for runtime deployment...that isn't required, so you can just remove the references.

Typically your local development environment will be copied into a Docker container, and then your Docker container is what actually runs or gets deployed. So you can safely patch the autoload files as part of your Docker image build. That way, you resolve the problem for your web server environment (typically a Docker based microservice), without haivng to change anything in your local environemnt. You can then continue using analysis tools as you were before.

An example patching script to call from Docker boot script:

#!/bin/bash

# the two files that need to be "unpatched":

autoOne=/var/www/html/vendor/composer/autoload_files.php
autoTwo=/var/www/html/vendor/composer/autoload_static.php

echo -e "\e[0m[\e[32mautoload-fixup\e[0m] patching..."

# fix the first one

if [ -w "$autoOne" ] ; then

echo -e "\e[0m[\e[32mautoload-fixup\e[0m] fixing: $autoOne"

sed -i.bak '/sabberworm.*\.php/d' $autoOne

fi

# fix the second one

if [ -w "$autoTwo" ] ; then

echo -e "\e[0m[\e[32mautoload-fixup\e[0m] fixing: $autoTwo"

sed -i.bak '/sabberworm.*\.php/d' $autoTwo
fi

echo -e "\e[0m[\e[32mautoload-fixup\e[0m] patching completed."

The intent here is just to remove direct class file references to the PHP CSS Parser folder. At the time of writing, its composer package name was sabberworm/php-css-parser.

Use cases

Use `Parser` to prepend an ID to all selectors

$myId = "#my_id";
$parser = new \Sabberworm\CSS\Parser($css);
$cssDocument = $parser->parse();
foreach ($cssDocument->getAllDeclarationBlocks() as $block) {
    foreach ($block->getSelectors() as $selector) {
        // Loop over all selector parts (the comma-separated strings in a
        // selector) and prepend the ID.
        $selector->setSelector($myId.' '.$selector->getSelector());
    }
}

Shrink all absolute sizes to half

$parser = new \Sabberworm\CSS\Parser($css);
$cssDocument = $parser->parse();
foreach ($cssDocument->getAllValues() as $value) {
    if ($value instanceof CSSSize && !$value->isRelative()) {
        $value->setSize($value->getSize() / 2);
    }
}

Remove unwanted rules

$parser = new \Sabberworm\CSS\Parser($css);
$cssDocument = $parser->parse();
foreach($cssDocument->getAllRuleSets() as $oRuleSet) {
    // 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('font-');
    $oRuleSet->removeRule('cursor');
}

Output

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

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

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

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

Or use one of the predefined formats:

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

To see what you can do with output formatting, look at the tests in tests/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 $contents =>
  array(4) {
    [0] =>
    class Sabberworm\CSS\Property\Charset#6 (2) {
      private $charset =>
      class Sabberworm\CSS\Value\CSSString#5 (2) {
        private $string =>
        string(5) "utf-8"
        protected $lineNumber =>
        int(1)
      }
      protected $lineNumber =>
      int(1)
    }
    [1] =>
    class Sabberworm\CSS\RuleSet\AtRuleSet#7 (4) {
      private $type =>
      string(9) "font-face"
      private $arguments =>
      string(0) ""
      private $rules =>
      array(2) {
        'font-family' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#8 (4) {
            private $rule =>
            string(11) "font-family"
            private $value =>
            class Sabberworm\CSS\Value\CSSString#9 (2) {
              private $string =>
              string(10) "CrassRoots"
              protected $lineNumber =>
              int(4)
            }
            private $isImportant =>
            bool(false)
            protected $lineNumber =>
            int(4)
          }
        }
        'src' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#10 (4) {
            private $rule =>
            string(3) "src"
            private $value =>
            class Sabberworm\CSS\Value\URL#11 (2) {
              private $url =>
              class Sabberworm\CSS\Value\CSSString#12 (2) {
                private $string =>
                string(15) "../media/cr.ttf"
                protected $lineNumber =>
                int(5)
              }
              protected $lineNumber =>
              int(5)
            }
            private $isImportant =>
            bool(false)
            protected $lineNumber =>
            int(5)
          }
        }
      }
      protected $lineNumber =>
      int(3)
    }
    [2] =>
    class Sabberworm\CSS\RuleSet\DeclarationBlock#13 (3) {
      private $selectors =>
      array(2) {
        [0] =>
        class Sabberworm\CSS\Property\Selector#14 (2) {
          private $selector =>
          string(4) "html"
          private $specificity =>
          NULL
        }
        [1] =>
        class Sabberworm\CSS\Property\Selector#15 (2) {
          private $selector =>
          string(4) "body"
          private $specificity =>
          NULL
        }
      }
      private $rules =>
      array(1) {
        'font-size' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#16 (4) {
            private $rule =>
            string(9) "font-size"
            private $value =>
            class Sabberworm\CSS\Value\Size#17 (4) {
              private $size =>
              double(1.6)
              private $unit =>
              string(2) "em"
              private $isColorComponent =>
              bool(false)
              protected $lineNumber =>
              int(9)
            }
            private $isImportant =>
            bool(false)
            protected $lineNumber =>
            int(9)
          }
        }
      }
      protected $lineNumber =>
      int(8)
    }
    [3] =>
    class Sabberworm\CSS\CSSList\KeyFrame#18 (4) {
      private $vendorKeyFrame =>
      string(9) "keyframes"
      private $animationName =>
      string(6) "mymove"
      protected $contents =>
      array(2) {
        [0] =>
        class Sabberworm\CSS\RuleSet\DeclarationBlock#19 (3) {
          private $selectors =>
          array(1) {
            [0] =>
            class Sabberworm\CSS\Property\Selector#20 (2) {
              private $selector =>
              string(4) "from"
              private $specificity =>
              NULL
            }
          }
          private $rules =>
          array(1) {
            'top' =>
            array(1) {
              [0] =>
              class Sabberworm\CSS\Rule\Rule#21 (4) {
                private $rule =>
                string(3) "top"
                private $value =>
                class Sabberworm\CSS\Value\Size#22 (4) {
                  private $size =>
                  double(0)
                  private $unit =>
                  string(2) "px"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(13)
                }
                private $isImportant =>
                bool(false)
                protected $lineNumber =>
                int(13)
              }
            }
          }
          protected $lineNumber =>
          int(13)
        }
        [1] =>
        class Sabberworm\CSS\RuleSet\DeclarationBlock#23 (3) {
          private $selectors =>
          array(1) {
            [0] =>
            class Sabberworm\CSS\Property\Selector#24 (2) {
              private $selector =>
              string(2) "to"
              private $specificity =>
              NULL
            }
          }
          private $rules =>
          array(1) {
            'top' =>
            array(1) {
              [0] =>
              class Sabberworm\CSS\Rule\Rule#25 (4) {
                private $rule =>
                string(3) "top"
                private $value =>
                class Sabberworm\CSS\Value\Size#26 (4) {
                  private $size =>
                  double(200)
                  private $unit =>
                  string(2) "px"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(14)
                }
                private $isImportant =>
                bool(false)
                protected $lineNumber =>
                int(14)
              }
            }
          }
          protected $lineNumber =>
          int(14)
        }
      }
      protected $lineNumber =>
      int(12)
    }
  }
  protected $lineNumber =>
  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 $contents =>
  array(1) {
    [0] =>
    class Sabberworm\CSS\RuleSet\DeclarationBlock#5 (3) {
      private $selectors =>
      array(1) {
        [0] =>
        class Sabberworm\CSS\Property\Selector#6 (2) {
          private $selector =>
          string(7) "#header"
          private $specificity =>
          NULL
        }
      }
      private $rules =>
      array(3) {
        'margin' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#7 (4) {
            private $rule =>
            string(6) "margin"
            private $value =>
            class Sabberworm\CSS\Value\RuleValueList#12 (3) {
              protected $components =>
              array(4) {
                [0] =>
                class Sabberworm\CSS\Value\Size#8 (4) {
                  private $size =>
                  double(10)
                  private $unit =>
                  string(2) "px"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(2)
                }
                [1] =>
                class Sabberworm\CSS\Value\Size#9 (4) {
                  private $size =>
                  double(2)
                  private $unit =>
                  string(2) "em"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(2)
                }
                [2] =>
                class Sabberworm\CSS\Value\Size#10 (4) {
                  private $size =>
                  double(1)
                  private $unit =>
                  string(2) "cm"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(2)
                }
                [3] =>
                class Sabberworm\CSS\Value\Size#11 (4) {
                  private $size =>
                  double(2)
                  private $unit =>
                  string(1) "%"
                  private $isColorComponent =>
                  bool(false)
                  protected $lineNumber =>
                  int(2)
                }
              }
              protected $separator =>
              string(1) " "
              protected $lineNumber =>
              int(2)
            }
            private $isImportant =>
            bool(false)
            protected $lineNumber =>
            int(2)
          }
        }
        'font-family' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#13 (4) {
            private $rule =>
            string(11) "font-family"
            private $value =>
            class Sabberworm\CSS\Value\RuleValueList#15 (3) {
              protected $components =>
              array(4) {
                [0] =>
                string(7) "Verdana"
                [1] =>
                string(9) "Helvetica"
                [2] =>
                class Sabberworm\CSS\Value\CSSString#14 (2) {
                  private $string =>
                  string(9) "Gill Sans"
                  protected $lineNumber =>
                  int(3)
                }
                [3] =>
                string(10) "sans-serif"
              }
              protected $sSeparator =>
              string(1) ","
              protected $lineNumber =>
              int(3)
            }
            private $isImportant =>
            bool(false)
            protected $lineNumber =>
            int(3)
          }
        }
        'color' =>
        array(1) {
          [0] =>
          class Sabberworm\CSS\Rule\Rule#16 (4) {
            private $rule =>
            string(5) "color"
            private $value =>
            string(3) "red"
            private $isImportant =>
            bool(true)
            protected $lineNumber =>
            int(4)
          }
        }
      }
      protected $lineNumber =>
      int(1)
    }
  }
  protected $lineNumber =>
  int(1)
}

Output (`render()`)

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

Class diagram

classDiagram
    direction LR

    class Anchor {
    }
    class AtRule {
        <<interface>>
    }
    class AtRuleBlockList {
    }
    class AtRuleSet {
    }
    class CSSBlockList {
        <<abstract>>
    }
    class CSSElement {
        <<interface>>
    }
    class CSSFunction {
    }
    class CSSList {
        <<abstract>>
    }
    class CSSListItem {
        <<interface>>
    }
    class CSSNamespace {
    }
    class CSSString {
    }
    class CalcFunction {
    }
    class CalcRuleValueList {
    }
    class Charset {
    }
    class Color {
    }
    class Comment {
    }
    class Commentable {
        <<interface>>
    }
    class DeclarationBlock {
    }
    class Document {
    }
    class Import {
    }
    class KeyFrame {
    }
    class KeyframeSelector {
    }
    class LineName {
    }
    class OutputException {
    }
    class OutputFormat {
    }
    class OutputFormatter {
    }
    class Parser {
    }
    class ParserState {
    }
    class Positionable {
        <<interface>>
    }
    class PrimitiveValue {
        <<abstract>>
    }
    class Renderable {
        <<interface>>
    }
    class Rule {
    }
    class RuleContainer {
        <<interface>>
    }
    class RuleSet {
    }
    class RuleValueList {
    }
    class Selector {
    }
    class Settings {
    }
    class Size {
    }
    class SourceException {
    }
    class SpecificityCalculator {
    }
    class URL {
    }
    class UnexpectedEOFException {
    }
    class UnexpectedTokenException {
    }
    class Value {
        <<abstract>>
    }
    class ValueList {
        <<abstract>>
    }

    Anchor ..> ParserState: dependency
    CSSListItem <|-- AtRule: inheritance
    AtRule <|.. AtRuleBlockList: realization
    CSSBlockList <|-- AtRuleBlockList: inheritance
    AtRule <|.. AtRuleSet: realization
    RuleSet <|-- AtRuleSet: inheritance
    CSSList <|-- CSSBlockList: inheritance
    Renderable <|-- CSSElement: inheritance
    ValueList <|-- CSSFunction: inheritance
    CSSElement <|.. CSSList: realization
    CSSListItem <|.. CSSList: realization
    CSSList ..> Charset: dependency
    CSSList ..> Import: dependency
    Positionable <|.. CSSList: realization
    Commentable <|-- CSSListItem: inheritance
    Renderable <|-- CSSListItem: inheritance
    AtRule <|.. CSSNamespace: realization
    Positionable <|.. CSSNamespace: realization
    PrimitiveValue <|-- CSSString: inheritance
    CSSFunction <|-- CalcFunction: inheritance
    RuleValueList <|-- CalcRuleValueList: inheritance
    AtRule <|.. Charset: realization
    Charset ..> CSSString: dependency
    Positionable <|.. Charset: realization
    CSSFunction <|-- Color: inheritance
    Positionable <|.. Comment: realization
    Renderable <|.. Comment: realization
    CSSElement <|.. DeclarationBlock: realization
    CSSListItem <|.. DeclarationBlock: realization
    Positionable <|.. DeclarationBlock: realization
    RuleContainer <|.. DeclarationBlock: realization
    DeclarationBlock ..> RuleSet : dependency
    DeclarationBlock ..> Selector: dependency
    CSSBlockList <|-- Document: inheritance
    AtRule <|.. Import: realization
    Positionable <|.. Import: realization
    AtRule <|.. KeyFrame: realization
    CSSList <|-- KeyFrame: inheritance
    Selector <|-- KeyframeSelector: inheritance
    ValueList <|-- LineName: inheritance
    SourceException <|-- OutputException: inheritance
    OutputFormat ..> OutputFormatter: dependency
    OutputFormatter ..> OutputFormat: dependency
    Parser ..> ParserState: dependency
    ParserState ..> Settings: dependency
    Value <|-- PrimitiveValue: inheritance
    CSSElement <|.. Rule: realization
    Commentable <|.. Rule: realization
    Positionable <|.. Rule: realization
    Rule ..> RuleValueList: dependency
    CSSElement <|.. RuleSet: realization
    CSSListItem <|.. RuleSet: realization
    Positionable <|.. RuleSet: realization
    RuleSet ..> Rule: dependency
    RuleContainer <|.. RuleSet: realization
    ValueList <|-- RuleValueList: inheritance
    Renderable <|.. Selector: realization
    PrimitiveValue <|-- Size: inheritance
    Exception <|-- SourceException: inheritance
    Positionable <|.. SourceException: realization
    URL ..> CSSString: dependency
    PrimitiveValue <|-- URL: inheritance
    UnexpectedTokenException <|-- UnexpectedEOFException: inheritance
    SourceException <|-- UnexpectedTokenException: inheritance
    CSSElement <|.. Value: realization
    Positionable <|.. Value: realization
    Value <|-- ValueList: inheritance

    CSSList ..> CSSList: dependency
    CSSList ..> Comment: dependency
    CSSList ..> RuleSet: dependency
    CSSNamespace ..> Comment: dependency
    Charset ..> Comment: dependency
    Import ..> Comment: dependency
    OutputFormat ..> OutputFormat: dependency
    Rule ..> Comment: dependency
    RuleSet ..> Comment: dependency
    ValueList ..> Value: dependency

API and deprecation policy

Please have a look at our API and deprecation policy.

Contributing

Contributions in the form of bug reports, feature requests, or pull requests are more than welcome. 🙏 Please have a look at our contribution guidelines to learn more about how to contribute to PHP-CSS-Parser.

Contributors/Thanks to

oliverklee for lots of refactorings, code modernizations and CI integrations
raxbg for contributions to parse calc, grid lines, and various bugfixes.
westonruter for bugfixes and improvements.
FMCorz for many patches and suggestions, for being able to parse comments and IE hacks (in lenient mode).
Lullabot for a patch that allows to know the line number for each parsed token.
ju1ius for the specificity parsing code and the ability to expand/compact shorthand properties.
ossinkine for a 150 time performance boost.
GaryJones for lots of input and https://css-specificity.info/.
docteurklein for output formatting and CSSList->remove() inspiration.
nicolopignatelli for PSR-0 compatibility.
diegoembarcadero for keyframe at-rule parsing.
goetas for @namespace at-rule support.
ziegenberg for general housekeeping and cleanup.
View full list

Misc

Legacy Support

The latest pre-PSR-0 version of this project can be checked with the 0.9.0 tag.

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PHP CSS Parser

Usage

Installation using Composer

Extraction

Options

Charset

Strict parsing

Disable multibyte functions

Manipulation

CSSList

RuleSet

Rule

Value

Convenience methods

To-Do

Preloading

Use cases

Use `Parser` to prepend an ID to all selectors

Shrink all absolute sizes to half

Remove unwanted rules

Output

Examples

Example 1 (At-Rules)

Input

Output (`render()`)

Example 2 (Values)

Input

Output (`render()`)

Class diagram

API and deprecation policy

Contributing

Contributors/Thanks to

Misc

Legacy Support

FilesExpand file tree

README.md

Latest commit

History

README.md

File metadata and controls

PHP CSS Parser

Usage

Installation using Composer

Extraction

Options

Charset

Strict parsing

Disable multibyte functions

Manipulation

CSSList

RuleSet

Rule

Value

Convenience methods

To-Do

Preloading

Use cases

Use Parser to prepend an ID to all selectors

Shrink all absolute sizes to half

Remove unwanted rules

Output

Examples

Example 1 (At-Rules)

Input

Output (render())

Example 2 (Values)

Input

Output (render())

Class diagram

API and deprecation policy

Contributing

Contributors/Thanks to

Misc

Legacy Support

Use `Parser` to prepend an ID to all selectors

Output (`render()`)

Output (`render()`)