Class: Aurum::Grammar

Inherits:
Object
  • Object
show all
Defined in:
lib/aurum/grammar.rb,
lib/aurum/grammar/automata.rb,
lib/aurum/grammar/syntax_rules.rb,
lib/aurum/grammar/lexical_rules.rb,
lib/aurum/grammar/dsl/lexical_definition.rb

Direct Known Subclasses

MetaLanguage::Grammar

Defined Under Namespace

Modules: DSL Classes: LexicalRules, SyntaxRules

Class Method Summary collapse

Class Method Details

.enum(literal) ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 220

def Grammar.enum literal
  Aurum::Grammar::LexicalRules::CharacterSet.enum(literal.to_s)
end

.include_grammar(grammar, mapping) ⇒ Object 



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# File 'lib/aurum/grammar.rb', line 13

def Grammar.include_grammar(grammar, mapping)
end

.inherited(grammar) ⇒ Object 



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# File 'lib/aurum/grammar.rb', line 16

def Grammar.inherited(grammar)
  grammar.instance_eval do
    @lexical_rules, @syntax_rules, @semantic_actions = LexicalRules.new, SyntaxRules.new, {}
    @character_classes_builder = DSL::CharacterClassesBuilder.new
    @lexical_rules_builder = DSL::LexicalRulesBuilder.new(@lexical_rules, @character_classes_builder)
    @precedeces_builder = DSL::PrecedencesBuilder.new(@syntax_rules)
    @productions_builder = DSL::ProductionsBuilder.new(@syntax_rules, @semantic_actions)
    @reserve_word_states = ['all']
    
    def character_classes &definition
      @character_classes_builder.instance_eval(&definition) if block_given?
    end
    
    def tokens &definition
      @lexical_rules_builder.instance_eval(&definition) if block_given?
    end
    
    def reserve_words_in *states
      @reserve_word_states = states
    end
    
    def precedences &definition
      @precedeces_builder.instance_eval(&definition) if block_given?
    end
    
    def syntax_rules &definition
      @productions_builder.instance_eval(&definition) if block_given?
    end        
    alias productions syntax_rules
    
    
    def start_from start_symbol
      start_symbol = Grammar.nonterminal(start_symbol.to_s)
      @syntax_rules.assign_operator_precedence_to_symbols
      [Builder.build_parsing_table(@syntax_rules, start_symbol), @semantic_actions]
    end
    
    def lexical_table
      Builder.build_lexical_table(@lexical_rules, @reserve_word_states, @syntax_rules.literals)
    end
  end
end

.nonterminal(name) ⇒ Object 



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# File 'lib/aurum/grammar/syntax_rules.rb', line 82

def Grammar.nonterminal name
  SyntaxRules::Symbol.new(name, false)
end

.precedence(associative, level) ⇒ Object 



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# File 'lib/aurum/grammar/syntax_rules.rb', line 86

def Grammar.precedence associative, level
  SyntaxRules::Precedence.new(associative, level)
end

.production(nonterminal, symbols) ⇒ Object 



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# File 'lib/aurum/grammar/syntax_rules.rb', line 90

def Grammar.production nonterminal, symbols
  SyntaxRules::Production.new(nonterminal, symbols)
end

.range(first, last = first) ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 214

def Grammar.range first, last = first
  first = first[0] if first.kind_of? String
  last = last[0] if last.kind_of? String
  Aurum::Grammar::LexicalRules::CharacterSet.range(first, last)
end

.terminal(name) ⇒ Object 



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# File 'lib/aurum/grammar/syntax_rules.rb', line 78

def Grammar.terminal name
  SyntaxRules::Symbol.new(name, true)
end