JezK
Edit File: logfilegenerator.rb
#-- # # # # Copyright (c) 1999-2006 Minero Aoki # # This program is free software. # You can distribute/modify this program under the same terms of ruby. # see the file "COPYING". # #++ module Racc class LogFileGenerator def initialize(states, debug_flags = DebugFlags.new) @states = states @grammar = states.grammar @debug_flags = debug_flags end def output(out) output_conflict out; out.puts output_useless out; out.puts output_rule out; out.puts output_token out; out.puts output_state out end # # Warnings # def output_conflict(out) @states.each do |state| if state.srconf out.printf "state %d contains %d shift/reduce conflicts\n", state.stateid, state.srconf.size end if state.rrconf out.printf "state %d contains %d reduce/reduce conflicts\n", state.stateid, state.rrconf.size end end end def output_useless(out) @grammar.each do |rl| if rl.useless? out.printf "rule %d (%s) never reduced\n", rl.ident, rl.target.to_s end end @grammar.each_nonterminal do |t| if t.useless? out.printf "useless nonterminal %s\n", t.to_s end end end # # States # def output_state(out) out << "--------- State ---------\n" showall = @debug_flags.la || @debug_flags.state @states.each do |state| out << "\nstate #{state.ident}\n\n" (showall ? state.closure : state.core).each do |ptr| pointer_out(out, ptr) if ptr.rule.ident != 0 or showall end out << "\n" action_out out, state end end def pointer_out(out, ptr) buf = sprintf("%4d) %s :", ptr.rule.ident, ptr.rule.target.to_s) ptr.rule.symbols.each_with_index do |tok, idx| buf << ' _' if idx == ptr.index buf << ' ' << tok.to_s end buf << ' _' if ptr.reduce? out.puts buf end def action_out(f, state) sr = state.srconf && state.srconf.dup rr = state.rrconf && state.rrconf.dup acts = state.action keys = acts.keys keys.sort! {|a,b| a.ident <=> b.ident } [ Shift, Reduce, Error, Accept ].each do |klass| keys.delete_if do |tok| act = acts[tok] if act.kind_of?(klass) outact f, tok, act if sr and c = sr.delete(tok) outsrconf f, c end if rr and c = rr.delete(tok) outrrconf f, c end true else false end end end sr.each {|tok, c| outsrconf f, c } if sr rr.each {|tok, c| outrrconf f, c } if rr act = state.defact if not act.kind_of?(Error) or @debug_flags.any? outact f, '$default', act end f.puts state.goto_table.each do |t, st| if t.nonterminal? f.printf " %-12s go to state %d\n", t.to_s, st.ident end end end def outact(f, t, act) case act when Shift f.printf " %-12s shift, and go to state %d\n", t.to_s, act.goto_id when Reduce f.printf " %-12s reduce using rule %d (%s)\n", t.to_s, act.ruleid, act.rule.target.to_s when Accept f.printf " %-12s accept\n", t.to_s when Error f.printf " %-12s error\n", t.to_s else raise "racc: fatal: wrong act for outact: act=#{act}(#{act.class})" end end def outsrconf(f, confs) confs.each do |c| r = c.reduce f.printf " %-12s [reduce using rule %d (%s)]\n", c.shift.to_s, r.ident, r.target.to_s end end def outrrconf(f, confs) confs.each do |c| r = c.low_prec f.printf " %-12s [reduce using rule %d (%s)]\n", c.token.to_s, r.ident, r.target.to_s end end # # Rules # def output_rule(out) out.print "-------- Grammar --------\n\n" @grammar.each do |rl| if @debug_flags.any? or rl.ident != 0 out.printf "rule %d %s: %s\n", rl.ident, rl.target.to_s, rl.symbols.join(' ') end end end # # Tokens # def output_token(out) out.print "------- Symbols -------\n\n" out.print "**Nonterminals, with rules where they appear\n\n" @grammar.each_nonterminal do |t| tmp = <<SRC %s (%d) on right: %s on left : %s SRC out.printf tmp, t.to_s, t.ident, symbol_locations(t.locate).join(' '), symbol_locations(t.heads).join(' ') end out.print "\n**Terminals, with rules where they appear\n\n" @grammar.each_terminal do |t| out.printf " %s (%d) %s\n", t.to_s, t.ident, symbol_locations(t.locate).join(' ') end end def symbol_locations(locs) locs.map {|loc| loc.rule.ident }.reject {|n| n == 0 }.uniq end end end # module Racc