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module Liquid
# Holds variables. Variables are only loaded "just in time"
# and are not evaluated as part of the render stage
#
# {{ monkey }}
# {{ user.name }}
#
# Variables can be combined with filters:
#
# {{ user | link }}
#
class Variable
FilterParser = /(?:#{FilterSeparator}|(?:\s*(?:#{QuotedFragment}|#{ArgumentSeparator})\s*)+)/o
attr_accessor :filters, :name
def initialize(markup)
@markup = markup
@name = nil
@filters = []
if match = markup.match(/\s*(#{QuotedFragment})(.*)/o)
@name = match[1]
if match[2].match(/#{FilterSeparator}\s*(.*)/o)
filters = Regexp.last_match(1).scan(FilterParser)
filters.each do |f|
if matches = f.match(/\s*(\w+)/)
filtername = matches[1]
filterargs = f.scan(/(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o).flatten
@filters << [filtername, filterargs]
end
end
end
end
end
def render(context)
return '' if @name.nil?
@filters.inject(context[@name]) do |output, filter|
filterargs = []
keyword_args = {}
filter[1].to_a.each do |a|
if matches = a.match(/\A#{TagAttributes}\z/o)
keyword_args[matches[1]] = context[matches[2]]
else
filterargs << context[a]
end
end
filterargs << keyword_args unless keyword_args.empty?
begin
output = context.invoke(filter[0], output, *filterargs)
rescue FilterNotFound
raise FilterNotFound, "Error - filter '#{filter[0]}' in '#{@markup.strip}' could not be found."
end
end
end
end
end
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