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Contents
require 'strscan'
module Whois
module Scanners
# The Scannable module tries to emulate a super-simple Abstract Syntax Tree structure
# including method for accessing ast nodes.
#
# == Usage
#
# Include the Scannable module and set the `self.scanner` value.
#
# class ParserFoo
# include Scannable
#
# self.scanner = ScannerFoo
# end
#
# Now you can access the AST using the <tt>node</tt> method.
#
# node "created_on"
# # => "2009-12-12"
#
# node? "created_on"
# # => true
#
# node? "created_at"
# # => false
#
module Scannable
def self.included(base)
base.class_attribute :scanner
end
def node(key)
if block_given?
value = ast[key]
value = yield(value) unless value.nil?
value
else
ast[key]
end
end
def node?(key)
!ast[key].nil?
end
def parse
scanner = self.scanner.is_a?(Array) ? self.scanner.first : self.scanner
settings = self.scanner.is_a?(Array) ? self.scanner.last : {}
scanner.new(settings).parse(content_for_scanner)
end
private
def ast
@ast ||= parse
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems