Class: Yaparc::ManyOne

Inherits:
Object
  • Object
show all
Includes:
Parsable
Defined in:
lib/yaparc.rb

Overview

requires at least one successfull application of parser.

Constant Summary

Constants included from Parsable

Parsable::IS_ALPHANUM, Parsable::IS_CR, Parsable::IS_DIGIT, Parsable::IS_LOWER, Parsable::IS_SPACE, Parsable::IS_WHITESPACE

Instance Attribute Summary

Attributes included from Parsable

#tree

Instance Method Summary collapse

Methods included from Parsable

#parse

Constructor Details

#initialize(parser, identity = []) ⇒ ManyOne

Returns a new instance of ManyOne.



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# File 'lib/yaparc.rb', line 316

def initialize(parser, identity = [])
  @parser = lambda do |input|
    Seq.new(parser, Many.new(parser, identity)) do |head, tail|
      case head
      when ::String
        if tail.instance_of?(::String)
          head + tail
        else
          raise "Incompatible type: head => #{head.inspect}, tail => #{tail.inspect}"
        end
      when ::Array
        if tail.instance_of?(Array)
          head + tail
        else
          raise "Incompatible type: head => #{head.inspect}, tail => #{tail.inspect}"
        end
      when ::Hash
        if tail.instance_of?(Hash)
          head.merge(tail)
        else
          raise "Incompatible type: head => #{head.inspect}, tail => #{tail.inspect}"
        end
      when ::Integer
        if tail.kind_of?(Integer)
          head + tail
        else
          raise "Incompatible type: head => #{head.inspect}, tail => #{tail.inspect}"
        end
      else
        if tail.nil?
          head
        else
          [head] + tail
        end
      end
    end
  end
end