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Versions: 45
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Contents
require 'singleton'
module BibTeX
class Filter
include Singleton
class << self
# Hook called by Ruby if Filter is subclassed
def inherited(base)
base.class_eval { include Singleton }
subclasses << base
end
# Returns a list of all current Filters
def subclasses
@subclasses ||= []
end
end
def apply(value)
value
end
alias convert apply
alias << apply
end
module Filters
LOAD_PATH = [File.expand_path('..', __FILE__), 'filters'].join('/').freeze
Dir.glob("#{LOAD_PATH}/*.rb").each do |filter|
require filter
end
def self.resolve!(filter)
resolve(filter) || raise(ArgumentError, "Failed to load filter #{filter.inspect}")
end
def self.resolve(filter)
case
when filter.respond_to?(:apply)
filter
when filter.respond_to?(:to_s)
klass = Filter.subclasses.detect do |c|
c.name == filter.to_s || c.name.split(/::/)[-1] =~ /^#{filter}$/i
end
klass && klass.instance
else
nil
end
end
end
end
Version data entries
45 entries across 45 versions & 2 rubygems