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require 'mustermann/pattern'
require 'forwardable'
module Mustermann
# Superclass for patterns that internally compile to a regular expression.
# @see Mustermann::Pattern
# @abstract
class RegexpBased < Pattern
# @return [Regexp] regular expression equivalent to the pattern.
attr_reader :regexp
alias_method :to_regexp, :regexp
# @param (see Mustermann::Pattern#initialize)
# @return (see Mustermann::Pattern#initialize)
# @see (see Mustermann::Pattern#initialize)
def initialize(string, options = {})
super
regexp = compile(options)
@peek_regexp = /\A(#{regexp})/
@regexp = /\A#{regexp}\Z/
end
# @param (see Mustermann::Pattern#peek_size)
# @return (see Mustermann::Pattern#peek_size)
# @see (see Mustermann::Pattern#peek_size)
def peek_size(string)
return unless match = peek_match(string)
match.to_s.size
end
# @param (see Mustermann::Pattern#peek_match)
# @return (see Mustermann::Pattern#peek_match)
# @see (see Mustermann::Pattern#peek_match)
def peek_match(string)
@peek_regexp.match(string)
end
extend Forwardable
def_delegators :regexp, :===, :=~, :match, :names, :named_captures
def compile(options = {})
raise NotImplementedError, 'subclass responsibility'
end
private :compile
end
end
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