Class: MultElement

Inherits:
OperatorElement show all
Defined in:
lib/rpdf2txt-rockit/grammar.rb

Instance Attribute Summary

Attributes inherited from OperatorElement

#sub_elements

Attributes inherited from Element

#sub_elements, #tree_specification

Instance Method Summary collapse

Methods inherited from OperatorElement

#==, #initialize, #name, #to_src

Methods inherited from Element

#initialize

Methods included from SourceCodeDumpable

as_code, as_method_named, as_module_method_named, #create_new, indent_lines, name_hash, #new_of_my_type, #parameter_named, #to_compact_src, #to_src_in_module, #type_to_src

Constructor Details

This class inherits a constructor from OperatorElement

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/rpdf2txt-rockit/grammar.rb', line 155

def inspect
  "#{inspect_sub_elements}*"
end

#normalize(productions) ⇒ Object

NT -> a b (se1 … sen)* c d

is normalized to

NT -> a b NT-Mult-X c d

|  a b c d

NT-Mult-X -> NT-Mult-X se1 … sen

|  se1 ... sen



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# File 'lib/rpdf2txt-rockit/grammar.rb', line 167

def normalize(productions)
  temp_nonterm = temp_nonterminal("Mult", productions.first)
  num_sub_elements = @sub_elements.length
  temp_production1 = 
    Production.new(temp_nonterm, [temp_nonterm].concat(@sub_elements),
     ArrayNodeBuilder.new((1..num_sub_elements).to_a, 0))
  temp_production2 = 
    Production.new(temp_nonterm, @sub_elements,
     ArrayNodeBuilder.new((0...num_sub_elements).to_a))
  ps2 = clone_and_substitute_productions(productions, []) do |prod, i|
    # Will insert empty ArrayNode
    prod.tree_builder = 
	ArrayNodeBuilder.new([], nil, prod.tree_builder, i)
    prod.tree_builder.shifting_insert = true
    prod
  end
  [clone_and_substitute_productions(productions, [temp_nonterm]) + ps2,
   temp_production1.normalize + temp_production2.normalize]
end