class Racc::SymbolTable
Attributes
Public Class Methods
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# File lib/racc/grammar.rb, line 950 def initialize @symbols = [] # :: [Racc::Sym] @cache = {} # :: {(String|Symbol) => Racc::Sym} @dummy = intern(:$start, true) @anchor = intern(false, true) # Symbol ID = 0 @error = intern(:error, false) # Symbol ID = 1 end
Public Instance Methods
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# File lib/racc/grammar.rb, line 978 def delete(sym) @symbols.delete sym @cache.delete sym.value end
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# File lib/racc/grammar.rb, line 989 def each(&block) @symbols.each(&block) end
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# File lib/racc/grammar.rb, line 1005 def each_nonterminal(&block) @nterms.each(&block) end
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# File lib/racc/grammar.rb, line 997 def each_terminal(&block) @terms.each(&block) end
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# File lib/racc/grammar.rb, line 1009 def fix terms, nterms = @symbols.partition {|s| s.terminal? } @symbols = terms + nterms @terms = terms @nterms = nterms @nt_base = terms.size fix_ident check_terminals end
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# File lib/racc/grammar.rb, line 966 def intern(val, dummy = false) @cache[val] ||= begin sym = Sym.new(val, dummy) @symbols.push sym sym end end
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# File lib/racc/grammar.rb, line 1001 def nonterminals @symbols[@nt_base, @symbols.size - @nt_base] end
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# File lib/racc/grammar.rb, line 993 def terminals(&block) @symbols[0, @nt_base] end
Private Instance Methods
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# File lib/racc/grammar.rb, line 1027 def check_terminals return unless @symbols.any? {|s| s.should_terminal? } @anchor.should_terminal @error.should_terminal each_terminal do |t| t.should_terminal if t.string_symbol? end each do |s| s.should_terminal if s.assoc end terminals().reject {|t| t.should_terminal? }.each do |t| raise CompileError, "terminal #{t} not declared as terminal" end nonterminals().select {|n| n.should_terminal? }.each do |n| raise CompileError, "symbol #{n} declared as terminal but is not terminal" end end
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# File lib/racc/grammar.rb, line 1021 def fix_ident @symbols.each_with_index do |t, i| t.ident = i end end