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Informations about the package php-css-parser

PHP CSS Parser

build status HHVM 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

Extraction

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

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

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.

Strict parsing

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

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.

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:

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:

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:

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:

Convenience methods

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

To-Do

Use cases

Use Parser to prepend an id to all selectors

Shrink all absolute sizes to half

Remove unwanted rules

Output

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

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

Or use one of the predefined formats:

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

Structure (var_dump())

Output (render())

Example 2 (Values)

Input

Structure (var_dump())

Output (render())

Contributors/Thanks to

Misc

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.

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