Contents

module Regexp::Expression

  class Subexpression < Regexp::Expression::Base
    attr_accessor :expressions

    def initialize(token, options = {})
      super

      @expressions = []
    end

    # Override base method to clone the expressions as well.
    def clone
      copy = super
      copy.expressions = @expressions.map {|e| e.clone }
      copy
    end

    def <<(exp)
      if exp.is_a?(WhiteSpace) and @expressions.last and
        @expressions.last.is_a?(WhiteSpace)
        @expressions.last.merge(exp)
      else
        @expressions << exp
      end
    end

    def insert(exp)
      @expressions.insert 0, exp
    end

    def each(&block)
      @expressions.each {|e| yield e}
    end

    def each_with_index(&block)
      @expressions.each_with_index {|e, i| yield e, i}
    end

    def first
      @expressions.first
    end

    def last
      @expressions.last
    end

    def [](index)
      @expressions[index]
    end

    def length
      @expressions.length
    end

    def empty?
      @expressions.empty?
    end

    def all?(&block)
      @expressions.all? {|exp| yield(exp) }
    end

    def ts
      starts_at
    end

    def te
      ts + to_s.length
    end

    def to_s(format = :full)
      s = ''

      # Note: the format does not get passed down to subexpressions.
      case format
      when :base
        s << @text.dup
        s << @expressions.map{|e| e.to_s}.join unless @expressions.empty?
      else
        s << @text.dup
        s << @expressions.map{|e| e.to_s}.join unless @expressions.empty?
        s << @quantifier if quantified?
      end

      s
    end

    def to_h
      h = super
      h[:text] = to_s(:base)
      h[:expressions] = @expressions.map(&:to_h)
      h
    end
  end

end

Version data entries

7 entries across 7 versions & 1 rubygems

Version	Path
regexp_parser-0.4.13	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.12	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.11	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.10	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.9	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.8	lib/regexp_parser/expression/subexpression.rb
regexp_parser-0.4.7	lib/regexp_parser/expression/subexpression.rb