gems.sass-3.2.9.lib.sass.callbacks.rb Maven / Gradle / Ivy
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Sass makes CSS fun again. Sass is an extension of CSS3, adding nested rules, variables, mixins, selector
inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a
web-framework plugin.
This is a repackaged GEM in a JAR format of the sass-lang.gem package. The sass-gems package version
follows the sass-lang.gem versions located http://rubyforge.org/frs/?group_id=9702. Simply change
the version of this package to download and repackage the same GEM version.
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module Sass
# A lightweight infrastructure for defining and running callbacks.
# Callbacks are defined using \{#define\_callback\} at the class level,
# and called using `run_#{name}` at the instance level.
#
# Clients can add callbacks by calling the generated `on_#{name}` method,
# and passing in a block that's run when the callback is activated.
#
# @example Define a callback
# class Munger
# extend Sass::Callbacks
# define_callback :string_munged
#
# def munge(str)
# res = str.gsub(/[a-z]/, '\1\1')
# run_string_munged str, res
# res
# end
# end
#
# @example Use a callback
# m = Munger.new
# m.on_string_munged {|str, res| puts "#{str} was munged into #{res}!"}
# m.munge "bar" #=> bar was munged into bbaarr!
module Callbacks
# Automatically includes {InstanceMethods}
# when something extends this module.
#
# @param base [Module]
def self.extended(base)
base.send(:include, InstanceMethods)
end
protected
module InstanceMethods
# Removes all callbacks registered against this object.
def clear_callbacks!
@_sass_callbacks = {}
end
end
# Define a callback with the given name.
# This will define an `on_#{name}` method
# that registers a block,
# and a `run_#{name}` method that runs that block
# (optionall with some arguments).
#
# @param name [Symbol] The name of the callback
# @return [void]
def define_callback(name)
class_eval <