Class: Fabulator::Grammar::Expr::Token

Inherits:
Object
  • Object
show all
Defined in:
lib/fabulator/grammar/expr/token.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Token

Returns a new instance of Token.



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# File 'lib/fabulator/grammar/expr/token.rb', line 5

def initialize
  @alternatives = [ ]
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/fabulator/grammar/expr/token.rb', line 3

def name
  @name
end

Instance Method Details

#add_alternative(a) ⇒ Object 



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# File 'lib/fabulator/grammar/expr/token.rb', line 9

def add_alternative(a)
  @alternatives << a
end

#parse(cursor) ⇒ Object 



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# File 'lib/fabulator/grammar/expr/token.rb', line 17

def parse(cursor)
  cursor.match_token(self.to_regex)
end

#to_regex ⇒ Object 



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# File 'lib/fabulator/grammar/expr/token.rb', line 13

def to_regex
  Regexp.union(@alternatives.collect{|a| a.to_regex })
end