Class: SexpGrammar::Rule

Inherits:
Object
  • Object
show all
Includes:
Element
Defined in:
lib/sexp_grammar/rule.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Element

#===

Constructor Details

#initialize(name, defn) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/sexp_grammar/rule.rb', line 8

def initialize(name, defn)
  @name = name
  @defn = defn
end

Instance Attribute Details

#defn ⇒ Object (readonly)

Returns the value of attribute defn.



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# File 'lib/sexp_grammar/rule.rb', line 6

def defn
  @defn
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/sexp_grammar/rule.rb', line 5

def name
  @name
end

Instance Method Details

#eat(sexp) ⇒ Object 



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# File 'lib/sexp_grammar/rule.rb', line 19

def eat(sexp)
  return nil unless match?(sexp.first)
  sexp[1..-1]
end

#inspect ⇒ Object 



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# File 'lib/sexp_grammar/rule.rb', line 24

def inspect
  "(rule #{name}, #{defn.inspect})"
end

#match?(sexp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sexp_grammar/rule.rb', line 13

def match?(sexp)
  return nil unless sexp.is_a?(Array)
  return false unless sexp.first && (sexp.first == name)
  defn.match?(sexp[1..-1])
end