Class: Yaparc::Alt

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

Overview

of Seq

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(*parsers) ⇒ Alt

Returns a new instance of Alt.



181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
 
# File 'lib/yaparc.rb', line 181

def initialize(*parsers)
  @parser = lambda do |input|
    final_result = Result::Fail.new(:input => input)
    parsers.each do |parser|
      case result = parser.parse(input)
      when Result::Fail
        next
#           when Result::Error
#             raise
#             return Result::Error.new(:value => result.value, :input => result.input)
      when Result::OK
        break final_result = result
      else
        raise
      end
    end
    final_result
  end
end