Excession

A library for modifying CSS files.

Currently only supports global hue rotation.

Look at Excession::CssRegexHueMod:

str = <<-CSS
body {
  background-color: #ff0000;
}
CSS

Excession::CssRegexHueMod.new.rotate_hue(120, str)
  # => "body {
  #  background-color: #00ff00;
  #}

This will recolour declarations of the form:

• #XXXXXX
• #YYY
• rgb(XXX, XXX, XXX)
• rgb(XXX%, XXX%, XXX%)

It does not recolour named colours, because without doing a full parse I can't tell with just a regular expression what is a colour and what is part of a selector.

There is a CSS parser in Excession::Parser::CssParser. This interface is incomplete because it is very slow (8 minutes to parse a 3500-line CSS file). There's a big TODO over this.

Alex Young alex@blackkettle.org