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Edit File : grammarfileparser.rb \| Size : 14.91 KB
# # $Id: 63bd084db2dce8a2c9760318faae6104717cead7 $ # # Copyright (c) 1999-2006 Minero Aoki # # This program is free software. # You can distribute/modify this program under the terms of # the GNU LGPL, Lesser General Public License version 2.1. # For details of the GNU LGPL, see the file "COPYING". # require 'racc' require 'racc/compat' require 'racc/grammar' require 'racc/parserfilegenerator' require 'racc/sourcetext' require 'stringio' module Racc grammar = Grammar.define { g = self g.class = seq(:CLASS, :cname, many(:param), :RULE, :rules, option(:END)) g.cname = seq(:rubyconst) {\|name\| @result.params.classname = name }\ \| seq(:rubyconst, "<", :rubyconst) {\|c, _, s\| @result.params.classname = c @result.params.superclass = s } g.rubyconst = separated_by1(:colon2, :SYMBOL) {\|syms\| syms.map {\|s\| s.to_s }.join('::') } g.colon2 = seq(':', ':') g.param = seq(:CONV, many1(:convdef), :END) {\|\| #@grammar.end_convert_block # FIXME }\ \| seq(:PRECHIGH, many1(:precdef), :PRECLOW) {\|\| @grammar.end_precedence_declaration true }\ \| seq(:PRECLOW, many1(:precdef), :PRECHIGH) {\|\| @grammar.end_precedence_declaration false }\ \| seq(:START, :symbol) {\|_, sym\| @grammar.start_symbol = sym }\ \| seq(:TOKEN, :symbols) {\|_, syms\| syms.each do \|s\| s.should_terminal end }\ \| seq(:OPTION, :options) {\|_, syms\| syms.each do \|opt\| case opt when 'result_var' @result.params.result_var = true when 'no_result_var' @result.params.result_var = false when 'omit_action_call' @result.params.omit_action_call = true when 'no_omit_action_call' @result.params.omit_action_call = false else raise CompileError, "unknown option: #{opt}" end end }\ \| seq(:EXPECT, :DIGIT) {\|_, num\| if @grammar.n_expected_srconflicts raise CompileError, "`expect' seen twice" end @grammar.n_expected_srconflicts = num } g.convdef = seq(:symbol, :STRING) {\|sym, code\| sym.serialized = code } g.precdef = seq(:LEFT, :symbols) {\|_, syms\| @grammar.declare_precedence :Left, syms }\ \| seq(:RIGHT, :symbols) {\|_, syms\| @grammar.declare_precedence :Right, syms }\ \| seq(:NONASSOC, :symbols) {\|_, syms\| @grammar.declare_precedence :Nonassoc, syms } g.symbols = seq(:symbol) {\|sym\| [sym] }\ \| seq(:symbols, :symbol) {\|list, sym\| list.push sym list }\ \| seq(:symbols, "\|") g.symbol = seq(:SYMBOL) {\|sym\| @grammar.intern(sym) }\ \| seq(:STRING) {\|str\| @grammar.intern(str) } g.options = many(:SYMBOL) {\|syms\| syms.map {\|s\| s.to_s } } g.rules = option(:rules_core) {\|list\| add_rule_block list unless list.empty? nil } g.rules_core = seq(:symbol) {\|sym\| [sym] }\ \| seq(:rules_core, :rule_item) {\|list, i\| list.push i list }\ \| seq(:rules_core, ';') {\|list, \| add_rule_block list unless list.empty? list.clear list }\ \| seq(:rules_core, ':') {\|list, \| next_target = list.pop add_rule_block list unless list.empty? [next_target] } g.rule_item = seq(:symbol)\ \| seq("\|") {\|\| OrMark.new(@scanner.lineno) }\ \| seq("=", :symbol) {\|_, sym\| Prec.new(sym, @scanner.lineno) }\ \| seq(:ACTION) {\|src\| UserAction.source_text(src) } } GrammarFileParser = grammar.parser_class if grammar.states.srconflict_exist? raise 'Racc boot script fatal: S/R conflict in build' end if grammar.states.rrconflict_exist? raise 'Racc boot script fatal: R/R conflict in build' end class GrammarFileParser # reopen class Result def initialize(grammar) @grammar = grammar @params = ParserFileGenerator::Params.new end attr_reader :grammar attr_reader :params end def GrammarFileParser.parse_file(filename) parse(File.read(filename), filename, 1) end def GrammarFileParser.parse(src, filename = '-', lineno = 1) new().parse(src, filename, lineno) end def initialize(debug_flags = DebugFlags.new) @yydebug = debug_flags.parse end def parse(src, filename = '-', lineno = 1) @filename = filename @lineno = lineno @scanner = GrammarFileScanner.new(src, @filename) @scanner.debug = @yydebug @grammar = Grammar.new @result = Result.new(@grammar) @embedded_action_seq = 0 yyparse @scanner, :yylex parse_user_code @result.grammar.init @result end private def next_token @scanner.scan end def on_error(tok, val, _values) if val.respond_to?(:id2name) v = val.id2name elsif val.kind_of?(String) v = val else v = val.inspect end raise CompileError, "#{location()}: unexpected token '#{v}'" end def location "#{@filename}:#{@lineno - 1 + @scanner.lineno}" end def add_rule_block(list) sprec = nil target = list.shift case target when OrMark, UserAction, Prec raise CompileError, "#{target.lineno}: unexpected symbol #{target.name}" end curr = [] list.each do \|i\| case i when OrMark add_rule target, curr, sprec curr = [] sprec = nil when Prec raise CompileError, "'=<prec>' used twice in one rule" if sprec sprec = i.symbol else curr.push i end end add_rule target, curr, sprec end def add_rule(target, list, sprec) if list.last.kind_of?(UserAction) act = list.pop else act = UserAction.empty end list.map! {\|s\| s.kind_of?(UserAction) ? embedded_action(s) : s } rule = Rule.new(target, list, act) rule.specified_prec = sprec @grammar.add rule end def embedded_action(act) sym = @grammar.intern("@#{@embedded_action_seq += 1}".intern, true) @grammar.add Rule.new(sym, [], act) sym end # # User Code Block # def parse_user_code line = @scanner.lineno _, blocks = @scanner.epilogue.split(/^----/) blocks.each do \|block\| header, body = block.lines.to_a label0, pathes = header.sub(/\A-+/, '').split('=', 2) label = canonical_label(label0) (pathes ? pathes.strip.split(' ') : []).each do \|path\| add_user_code label, SourceText.new(File.read(path), path, 1) end add_user_code label, SourceText.new(body.join(''), @filename, line + 1) line += (1 + body.size) end end USER_CODE_LABELS = { 'header' => :header, 'prepare' => :header, # obsolete 'inner' => :inner, 'footer' => :footer, 'driver' => :footer # obsolete } def canonical_label(src) label = src.to_s.strip.downcase.slice(/\w+/) unless USER_CODE_LABELS.key?(label) raise CompileError, "unknown user code type: #{label.inspect}" end label end def add_user_code(label, src) @result.params.send(USER_CODE_LABELS[label]).push src end end class GrammarFileScanner def initialize(str, filename = '-') @lines = str.b.split(/\n\|\r\n\|\r/) @filename = filename @lineno = -1 @line_head = true @in_rule_blk = false @in_conv_blk = false @in_block = nil @epilogue = '' @debug = false next_line end attr_reader :epilogue def lineno @lineno + 1 end attr_accessor :debug def yylex(&block) unless @debug yylex0(&block) else yylex0 do \|sym, tok\| $stderr.printf "%7d %-10s %s\n", lineno(), sym.inspect, tok.inspect yield [sym, tok] end end end private def yylex0 begin until @line.empty? @line.sub!(/\A\s+/, '') if /\A\#/ =~ @line break elsif /\A\/\/ =~ @line skip_comment elsif s = reads(/\A[a-zA-Z_]\w/) yield [atom_symbol(s), s.intern] elsif s = reads(/\A\d+/) yield [:DIGIT, s.to_i] elsif ch = reads(/\A./) case ch when '"', "'" yield [:STRING, eval(scan_quoted(ch))] when '{' lineno = lineno() yield [:ACTION, SourceText.new(scan_action(), @filename, lineno)] else if ch == '\|' @line_head = false end yield [ch, ch] end else end end end while next_line() yield nil end def next_line @lineno += 1 @line = @lines[@lineno] if not @line or /\A----/ =~ @line @epilogue = @lines.join("\n") @lines.clear @line = nil if @in_block @lineno -= 1 scan_error! sprintf('unterminated %s', @in_block) end false else @line.sub!(/(?:\n\|\r\n\|\r)\z/, '') @line_head = true true end end ReservedWord = { 'right' => :RIGHT, 'left' => :LEFT, 'nonassoc' => :NONASSOC, 'preclow' => :PRECLOW, 'prechigh' => :PRECHIGH, 'token' => :TOKEN, 'convert' => :CONV, 'options' => :OPTION, 'start' => :START, 'expect' => :EXPECT, 'class' => :CLASS, 'rule' => :RULE, 'end' => :END } def atom_symbol(token) if token == 'end' symbol = :END @in_conv_blk = false @in_rule_blk = false else if @line_head and not @in_conv_blk and not @in_rule_blk symbol = ReservedWord[token] \|\| :SYMBOL else symbol = :SYMBOL end case symbol when :RULE then @in_rule_blk = true when :CONV then @in_conv_blk = true end end @line_head = false symbol end def skip_comment @in_block = 'comment' until m = /\\//.match(@line) next_line end @line = m.post_match @in_block = nil end $raccs_print_type = false def scan_action buf = '' nest = 1 pre = nil @in_block = 'action' begin pre = nil if s = reads(/\A\s+/) # does not set 'pre' buf << s end until @line.empty? if s = reads(/\A[^'"`{}%#\/\$]+/) buf << (pre = s) next end case ch = read(1) when '{' nest += 1 buf << (pre = ch) when '}' nest -= 1 if nest == 0 @in_block = nil buf.sub!(/[ \t\f]+\z/, '') return buf end buf << (pre = ch) when '#' # comment buf << ch << @line break when "'", '"', '`' buf << (pre = scan_quoted(ch)) when '%' if literal_head? pre, @line # % string, regexp, array buf << ch case ch = read(1) when /[qQx]/n buf << ch << (pre = scan_quoted(read(1), '%string')) when /wW/n buf << ch << (pre = scan_quoted(read(1), '%array')) when /s/n buf << ch << (pre = scan_quoted(read(1), '%symbol')) when /r/n buf << ch << (pre = scan_quoted(read(1), '%regexp')) when /[a-zA-Z0-9= ]/n # does not include "_" scan_error! "unknown type of % literal '%#{ch}'" else buf << (pre = scan_quoted(ch, '%string')) end else # operator buf << '\|\|op->' if $raccs_print_type buf << (pre = ch) end when '/' if literal_head? pre, @line # regexp buf << (pre = scan_quoted(ch, 'regexp')) else # operator buf << '\|\|op->' if $raccs_print_type buf << (pre = ch) end when '$' # gvar buf << ch << (pre = read(1)) else raise 'racc: fatal: must not happen' end end buf << "\n" end while next_line() raise 'racc: fatal: scan finished before parser finished' end def literal_head?(pre, post) (!pre \|\| /[a-zA-Z_0-9]/n !~ pre[-1,1]) && !post.empty? && /\A[\s\=]/n !~ post end def read(len) s = @line[0, len] @line = @line[len .. -1] s end def reads(re) m = re.match(@line) or return nil @line = m.post_match m[0] end def scan_quoted(left, tag = 'string') buf = left.dup buf = "\|\|#{tag}->" + buf if $raccs_print_type re = get_quoted_re(left) sv, @in_block = @in_block, tag begin if s = reads(re) buf << s break else buf << @line end end while next_line() @in_block = sv buf << "<-#{tag}\|\|" if $raccs_print_type buf end LEFT_TO_RIGHT = { '(' => ')', '{' => '}', '[' => ']', '<' => '>' } CACHE = {} def get_quoted_re(left) term = Regexp.quote(LEFT_TO_RIGHT[left] \|\| left) CACHE[left] \|\|= /\A[^#{term}\\](?:\\.[^\\#{term}])#{term}/ end def scan_error!(msg) raise CompileError, "#{lineno()}: #{msg}" end end end # module Racc Back

Edit File : grammarfileparser.rb | Size : 14.91 KB

#
# $Id: 63bd084db2dce8a2c9760318faae6104717cead7 $
#
# Copyright (c) 1999-2006 Minero Aoki
#
# This program is free software.
# You can distribute/modify this program under the terms of
# the GNU LGPL, Lesser General Public License version 2.1.
# For details of the GNU LGPL, see the file "COPYING".
#

require 'racc'
require 'racc/compat'
require 'racc/grammar'
require 'racc/parserfilegenerator'
require 'racc/sourcetext'
require 'stringio'

module Racc

grammar = Grammar.define {
    g = self

g.class = seq(:CLASS, :cname, many(:param), :RULE, :rules, option(:END))

g.cname       = seq(:rubyconst) {|name|
                      @result.params.classname = name
                    }\
                  | seq(:rubyconst, "<", :rubyconst) {|c, _, s|
                      @result.params.classname = c
                      @result.params.superclass = s
                    }

g.rubyconst   = separated_by1(:colon2, :SYMBOL) {|syms|
                      syms.map {|s| s.to_s }.join('::')
                    }

g.colon2 = seq(':', ':')

g.param       = seq(:CONV, many1(:convdef), :END) {|*|
                      #@grammar.end_convert_block   # FIXME
                    }\
                  | seq(:PRECHIGH, many1(:precdef), :PRECLOW) {|*|
                      @grammar.end_precedence_declaration true
                    }\
                  | seq(:PRECLOW, many1(:precdef), :PRECHIGH) {|*|
                      @grammar.end_precedence_declaration false
                    }\
                  | seq(:START, :symbol) {|_, sym|
                      @grammar.start_symbol = sym
                    }\
                  | seq(:TOKEN, :symbols) {|_, syms|
                      syms.each do |s|
                        s.should_terminal
                      end
                    }\
                  | seq(:OPTION, :options) {|_, syms|
                      syms.each do |opt|
                        case opt
                        when 'result_var'
                          @result.params.result_var = true
                        when 'no_result_var'
                          @result.params.result_var = false
                        when 'omit_action_call'
                          @result.params.omit_action_call = true
                        when 'no_omit_action_call'
                          @result.params.omit_action_call = false
                        else
                          raise CompileError, "unknown option: #{opt}"
                        end
                      end
                    }\
                  | seq(:EXPECT, :DIGIT) {|_, num|
                      if @grammar.n_expected_srconflicts
                        raise CompileError, "`expect' seen twice"
                      end
                      @grammar.n_expected_srconflicts = num
                    }

g.convdef     = seq(:symbol, :STRING) {|sym, code|
                      sym.serialized = code
                    }

g.precdef     = seq(:LEFT, :symbols) {|_, syms|
                      @grammar.declare_precedence :Left, syms
                    }\
                  | seq(:RIGHT, :symbols) {|_, syms|
                      @grammar.declare_precedence :Right, syms
                    }\
                  | seq(:NONASSOC, :symbols) {|_, syms|
                      @grammar.declare_precedence :Nonassoc, syms
                    }

g.symbols     = seq(:symbol) {|sym|
                      [sym]
                    }\
                  | seq(:symbols, :symbol) {|list, sym|
                      list.push sym
                      list
                    }\
                  | seq(:symbols, "|")

g.symbol      = seq(:SYMBOL) {|sym| @grammar.intern(sym) }\
                  | seq(:STRING) {|str| @grammar.intern(str) }

g.options     = many(:SYMBOL) {|syms| syms.map {|s| s.to_s } }

g.rules       = option(:rules_core) {|list|
                      add_rule_block list  unless list.empty?
                      nil
                    }

g.rules_core  = seq(:symbol) {|sym|
                      [sym]
                    }\
                  | seq(:rules_core, :rule_item) {|list, i|
                      list.push i
                      list
                    }\
                  | seq(:rules_core, ';') {|list, *|
                      add_rule_block list  unless list.empty?
                      list.clear
                      list
                    }\
                  | seq(:rules_core, ':') {|list, *|
                      next_target = list.pop
                      add_rule_block list  unless list.empty?
                      [next_target]
                    }

g.rule_item   = seq(:symbol)\
                  | seq("|") {|*|
                      OrMark.new(@scanner.lineno)
                    }\
                  | seq("=", :symbol) {|_, sym|
                      Prec.new(sym, @scanner.lineno)
                    }\
                  | seq(:ACTION) {|src|
                      UserAction.source_text(src)
                    }
  }

GrammarFileParser = grammar.parser_class

if grammar.states.srconflict_exist?
    raise 'Racc boot script fatal: S/R conflict in build'
  end
  if grammar.states.rrconflict_exist?
    raise 'Racc boot script fatal: R/R conflict in build'
  end

class GrammarFileParser   # reopen

class Result
      def initialize(grammar)
        @grammar = grammar
        @params = ParserFileGenerator::Params.new
      end

attr_reader :grammar
      attr_reader :params
    end

def GrammarFileParser.parse_file(filename)
      parse(File.read(filename), filename, 1)
    end

def GrammarFileParser.parse(src, filename = '-', lineno = 1)
      new().parse(src, filename, lineno)
    end

def initialize(debug_flags = DebugFlags.new)
      @yydebug = debug_flags.parse
    end

def parse(src, filename = '-', lineno = 1)
      @filename = filename
      @lineno = lineno
      @scanner = GrammarFileScanner.new(src, @filename)
      @scanner.debug = @yydebug
      @grammar = Grammar.new
      @result = Result.new(@grammar)
      @embedded_action_seq = 0
      yyparse @scanner, :yylex
      parse_user_code
      @result.grammar.init
      @result
    end

private

def next_token
      @scanner.scan
    end

def on_error(tok, val, _values)
      if val.respond_to?(:id2name)
        v = val.id2name
      elsif val.kind_of?(String)
        v = val
      else
        v = val.inspect
      end
      raise CompileError, "#{location()}: unexpected token '#{v}'"
    end

def location
      "#{@filename}:#{@lineno - 1 + @scanner.lineno}"
    end

def add_rule_block(list)
      sprec = nil
      target = list.shift
      case target
      when OrMark, UserAction, Prec
        raise CompileError, "#{target.lineno}: unexpected symbol #{target.name}"
      end
      curr = []
      list.each do |i|
        case i
        when OrMark
          add_rule target, curr, sprec
          curr = []
          sprec = nil
        when Prec
          raise CompileError, "'=<prec>' used twice in one rule" if sprec
          sprec = i.symbol
        else
          curr.push i
        end
      end
      add_rule target, curr, sprec
    end

def add_rule(target, list, sprec)
      if list.last.kind_of?(UserAction)
        act = list.pop
      else
        act = UserAction.empty
      end
      list.map! {|s| s.kind_of?(UserAction) ? embedded_action(s) : s }
      rule = Rule.new(target, list, act)
      rule.specified_prec = sprec
      @grammar.add rule
    end

def embedded_action(act)
      sym = @grammar.intern("@#{@embedded_action_seq += 1}".intern, true)
      @grammar.add Rule.new(sym, [], act)
      sym
    end

#
    # User Code Block
    #

def parse_user_code
      line = @scanner.lineno
      _, *blocks = *@scanner.epilogue.split(/^----/)
      blocks.each do |block|
        header, *body = block.lines.to_a
        label0, pathes = *header.sub(/\A-+/, '').split('=', 2)
        label = canonical_label(label0)
        (pathes ? pathes.strip.split(' ') : []).each do |path|
          add_user_code label, SourceText.new(File.read(path), path, 1)
        end
        add_user_code label, SourceText.new(body.join(''), @filename, line + 1)
        line += (1 + body.size)
      end
    end

USER_CODE_LABELS = {
      'header'  => :header,
      'prepare' => :header,   # obsolete
      'inner'   => :inner,
      'footer'  => :footer,
      'driver'  => :footer    # obsolete
    }

def canonical_label(src)
      label = src.to_s.strip.downcase.slice(/\w+/)
      unless USER_CODE_LABELS.key?(label)
        raise CompileError, "unknown user code type: #{label.inspect}"
      end
      label
    end

def add_user_code(label, src)
      @result.params.send(USER_CODE_LABELS[label]).push src
    end

end

class GrammarFileScanner

def initialize(str, filename = '-')
      @lines  = str.b.split(/\n|\r\n|\r/)
      @filename = filename
      @lineno = -1
      @line_head   = true
      @in_rule_blk = false
      @in_conv_blk = false
      @in_block = nil
      @epilogue = ''
      @debug = false
      next_line
    end

attr_reader :epilogue

def lineno
      @lineno + 1
    end

attr_accessor :debug

def yylex(&block)
      unless @debug
        yylex0(&block)
      else
        yylex0 do |sym, tok|
          $stderr.printf "%7d %-10s %s\n", lineno(), sym.inspect, tok.inspect
          yield [sym, tok]
        end
      end
    end

private

def yylex0
      begin
        until @line.empty?
          @line.sub!(/\A\s+/, '')
          if /\A\#/ =~ @line
            break
          elsif /\A\/\*/ =~ @line
            skip_comment
          elsif s = reads(/\A[a-zA-Z_]\w*/)
            yield [atom_symbol(s), s.intern]
          elsif s = reads(/\A\d+/)
            yield [:DIGIT, s.to_i]
          elsif ch = reads(/\A./)
            case ch
            when '"', "'"
              yield [:STRING, eval(scan_quoted(ch))]
            when '{'
              lineno = lineno()
              yield [:ACTION, SourceText.new(scan_action(), @filename, lineno)]
            else
              if ch == '|'
                @line_head = false
              end
              yield [ch, ch]
            end
          else
          end
        end
      end while next_line()
      yield nil
    end

def next_line
      @lineno += 1
      @line = @lines[@lineno]
      if not @line or /\A----/ =~ @line
        @epilogue = @lines.join("\n")
        @lines.clear
        @line = nil
        if @in_block
          @lineno -= 1
          scan_error! sprintf('unterminated %s', @in_block)
        end
        false
      else
        @line.sub!(/(?:\n|\r\n|\r)\z/, '')
        @line_head = true
        true
      end
    end

ReservedWord = {
      'right'    => :RIGHT,
      'left'     => :LEFT,
      'nonassoc' => :NONASSOC,
      'preclow'  => :PRECLOW,
      'prechigh' => :PRECHIGH,
      'token'    => :TOKEN,
      'convert'  => :CONV,
      'options'  => :OPTION,
      'start'    => :START,
      'expect'   => :EXPECT,
      'class'    => :CLASS,
      'rule'     => :RULE,
      'end'      => :END
    }

def atom_symbol(token)
      if token == 'end'
        symbol = :END
        @in_conv_blk = false
        @in_rule_blk = false
      else
        if @line_head and not @in_conv_blk and not @in_rule_blk
          symbol = ReservedWord[token] || :SYMBOL
        else
          symbol = :SYMBOL
        end
        case symbol
        when :RULE then @in_rule_blk = true
        when :CONV then @in_conv_blk = true
        end
      end
      @line_head = false
      symbol
    end

def skip_comment
      @in_block = 'comment'
      until m = /\*\//.match(@line)
        next_line
      end
      @line = m.post_match
      @in_block = nil
    end

$raccs_print_type = false

def scan_action
      buf = ''
      nest = 1
      pre = nil
      @in_block = 'action'
      begin
        pre = nil
        if s = reads(/\A\s+/)
          # does not set 'pre'
          buf << s
        end
        until @line.empty?
          if s = reads(/\A[^'"`{}%#\/\$]+/)
            buf << (pre = s)
            next
          end
          case ch = read(1)
          when '{'
            nest += 1
            buf << (pre = ch)
          when '}'
            nest -= 1
            if nest == 0
              @in_block = nil
              buf.sub!(/[ \t\f]+\z/, '')
              return buf
            end
            buf << (pre = ch)
          when '#'   # comment
            buf << ch << @line
            break
          when "'", '"', '`'
            buf << (pre = scan_quoted(ch))
          when '%'
            if literal_head? pre, @line
              # % string, regexp, array
              buf << ch
              case ch = read(1)
              when /[qQx]/n
                buf << ch << (pre = scan_quoted(read(1), '%string'))
              when /wW/n
                buf << ch << (pre = scan_quoted(read(1), '%array'))
              when /s/n
                buf << ch << (pre = scan_quoted(read(1), '%symbol'))
              when /r/n
                buf << ch << (pre = scan_quoted(read(1), '%regexp'))
              when /[a-zA-Z0-9= ]/n   # does not include "_"
                scan_error! "unknown type of % literal '%#{ch}'"
              else
                buf << (pre = scan_quoted(ch, '%string'))
              end
            else
              # operator
              buf << '||op->' if $raccs_print_type
              buf << (pre = ch)
            end
          when '/'
            if literal_head? pre, @line
              # regexp
              buf << (pre = scan_quoted(ch, 'regexp'))
            else
              # operator
              buf << '||op->' if $raccs_print_type
              buf << (pre = ch)
            end
          when '$'   # gvar
            buf << ch << (pre = read(1))
          else
            raise 'racc: fatal: must not happen'
          end
        end
        buf << "\n"
      end while next_line()
      raise 'racc: fatal: scan finished before parser finished'
    end

def literal_head?(pre, post)
      (!pre || /[a-zA-Z_0-9]/n !~ pre[-1,1]) &&
          !post.empty? && /\A[\s\=]/n !~ post
    end

def read(len)
      s = @line[0, len]
      @line = @line[len .. -1]
      s
    end

def reads(re)
      m = re.match(@line) or return nil
      @line = m.post_match
      m[0]
    end

def scan_quoted(left, tag = 'string')
      buf = left.dup
      buf = "||#{tag}->" + buf if $raccs_print_type
      re = get_quoted_re(left)
      sv, @in_block = @in_block, tag
      begin
        if s = reads(re)
          buf << s
          break
        else
          buf << @line
        end
      end while next_line()
      @in_block = sv
      buf << "<-#{tag}||" if $raccs_print_type
      buf
    end

LEFT_TO_RIGHT = {
      '(' => ')',
      '{' => '}',
      '[' => ']',
      '<' => '>'
    }

CACHE = {}

def get_quoted_re(left)
      term = Regexp.quote(LEFT_TO_RIGHT[left] || left)
      CACHE[left] ||= /\A[^#{term}\\]*(?:\\.[^\\#{term}]*)*#{term}/
    end

def scan_error!(msg)
      raise CompileError, "#{lineno()}: #{msg}"
    end

end

end   # module Racc

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