NAME

CSS::Simple - Interface through which to read/write/manipulate CSS files while respecting the cascade order

SYNOPSIS

 use CSS::Simple;
 my $css = new CSS::Simple();
 $css->read_file({ filename => 'input.css' });
 #perform manipulations...
 $css->write_file({ filename => 'output.css' });

DESCRIPTION

Class for reading, manipulating and writing CSS. Unlike other CSS classes on CPAN this particular module focuses on respecting the order of selectors while providing a common sense API through which to manipulate the rules.

Please note that while ordering is respected, the exact order of selectors may change. I.e. the rules implied by the styles and their ordering will not change, but the actual ordering of the styles may shift around. See the read method for more information.

CONSTRUCTOR

new ([ OPTIONS ])

Instantiates the CSS::Simple object. Sets up class variables that are used during file parsing/processing.

warns_as_errors (optional). Boolean value to indicate whether fatal errors should occur during parse failures.

browser_specific_properties (optional). Boolean value to indicate whether browser specific properties should be processed.

METHODS

read_file( params )

Opens and reads a CSS file, then subsequently performs the parsing of the CSS file necessary for later manipulation.

This method requires you to pass in a params hash that contains a filename argument. For example:

$self->read_file({filename => 'myfile.css'});

read( params )

Reads css data and parses it. The intermediate data is stored in class variables.

Compound selectors (i.e. "a, span") are split apart during parsing and stored separately, so the output of any given stylesheet may not match the output 100%, but the rules themselves should apply as expected.

Ordering of selectors may shift if the same selector is seen twice within the stylesheet. The precendence for any given selector is the last time it was seen by the parser.

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->read({css => $css});

write_file()

Write the parsed and manipulated CSS out to a file parameter

This method requires you to pass in a params hash that contains a filename argument. For example:

$self->write_file({filename => 'myfile.css'});

write()

Write the parsed and manipulated CSS out to a scalar and return it

content_warnings()

Return back any warnings thrown while parsing a given block of css

Note: content warnings are initialized at read time. In order to receive back content feedback you must perform read() first.

get_selectors( params )

Get an array of selectors that represents an inclusive list of all selectors stored.

get_properties( params )

Get a hash that represents the various properties for this particular selector

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->get_properties({selector => '.foo'});

check_selector( params )

Determine if a selector exists within the stored rulesets

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->check_selector({selector => '.foo'});

modify_selector( params )

Modify an existing selector

Modifying a selector maintains the existing selectivity of the rule with relation to the original stylesheet. If you want to ignore that selectivity, delete the element and re-add it to CSS::Simple

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->modify_selector({selector => '.foo', new_selector => '.bar' });

add_selector( params )

Add a selector and associated properties to the stored rulesets

In the event that this particular ruleset already exists, invoking this method will simply replace the item. This is important - if you are modifying an existing rule using this method than the previously existing selectivity will continue to persist. Delete the selector first if you want to ignore the previous selectivity.

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->add_selector({selector => '.foo', properties => {color => 'red' }});

add_properties( params )

Add properties to an existing selector, preserving the selectivity of the original declaration.

In the event that this method is invoked with a selector that doesn't exist then the call is just translated to an add_selector call, thus creating the rule at the end of the ruleset.

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->add_properties({selector => '.foo', properties => {color => 'red' }});

delete_selector( params )

Delete a selector from the ruleset

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->delete_selector({selector => '.foo' });

delete_property( params )

Delete a property from a specific selectors rules

This method requires you to pass in a params hash that contains scalar css data. For example:

$self->delete_property({selector => '.foo', property => 'color' });

Sponsor

This code has been developed under sponsorship of MailerMailer LLC, http://www.mailermailer.com/

AUTHOR

Kevin Kamel <"kamelkev@mailermailer.com">

ATTRIBUTION

This module is directly based off of Adam Kennedy's <adamk@cpan.org> CSS::Tiny module.

This particular version differs in terms of interface and the ultimate ordering of the CSS.

LICENSE

This module is a derived version of Adam Kennedy's CSS::Tiny Module.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.