Class: Packrat::Maybe

Inherits:

GrammarElement

• Object
• GrammarElement
• Packrat::Maybe

Defined in:

lib/packrat/grammar.rb

Instance Attribute Summary

Attributes inherited from GrammarElement

#hidden

Instance Method Summary

• #initialize(sub) ⇒ Maybe constructor

  A new instance of Maybe.

• #inspect ⇒ Object
• #parse(parser) ⇒ Object

Methods inherited from GrammarElement

#to_packrat_grammar_element

Constructor Details

#initialize(sub) ⇒ Maybe

Returns a new instance of Maybe.

# File 'lib/packrat/grammar.rb', line 224

def initialize(sub)
  @sub = sub.to_packrat_grammar_element
end

Instance Method Details

#inspect ⇒ Object

# File 'lib/packrat/grammar.rb', line 231

def inspect
  "(#{@sub.inspect})?"
end

#parse(parser) ⇒ Object

# File 'lib/packrat/grammar.rb', line 227

def parse(parser)
  res = @sub.parse(parser)
  false == res ? nil : res
end