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Edit File : parserfilegenerator.rb \| Size : 11.63 KB
#-- # # # # 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". # #++ require 'racc/compat' require 'racc/sourcetext' require 'racc/parser-text' require 'rbconfig' module Racc class ParserFileGenerator class Params def self.bool_attr(name) module_eval(<<-End) def #{name}? @#{name} end def #{name}=(b) @#{name} = b end End end attr_accessor :filename attr_accessor :classname attr_accessor :superclass bool_attr :omit_action_call bool_attr :result_var attr_accessor :header attr_accessor :inner attr_accessor :footer bool_attr :debug_parser bool_attr :convert_line bool_attr :convert_line_all bool_attr :embed_runtime bool_attr :make_executable attr_accessor :interpreter def initialize # Parameters derived from parser self.filename = nil self.classname = nil self.superclass = 'Racc::Parser' self.omit_action_call = true self.result_var = true self.header = [] self.inner = [] self.footer = [] # Parameters derived from command line options self.debug_parser = false self.convert_line = true self.convert_line_all = false self.embed_runtime = false self.make_executable = false self.interpreter = nil end end def initialize(states, params) @states = states @grammar = states.grammar @params = params end def generate_parser string_io = StringIO.new init_line_conversion_system @f = string_io parser_file string_io.rewind string_io.read end def generate_parser_file(destpath) init_line_conversion_system File.open(destpath, 'w') {\|f\| @f = f parser_file } File.chmod 0755, destpath if @params.make_executable? end private def parser_file shebang @params.interpreter if @params.make_executable? notice line if @params.embed_runtime? embed_library runtime_source() else require 'racc/parser.rb' end header parser_class(@params.classname, @params.superclass) { inner state_transition_table } footer end c = ::RbConfig::CONFIG RUBY_PATH = "#{c['bindir']}/#{c['ruby_install_name']}#{c['EXEEXT']}" def shebang(path) line '#!' + (path == 'ruby' ? RUBY_PATH : path) end def notice line %q[#] line %q[# DO NOT MODIFY!!!!] line %Q[# This file is automatically generated by Racc #{Racc::Version}] line %Q[# from Racc grammar file "#{@params.filename}".] line %q[#] end def runtime_source SourceText.new(::Racc::PARSER_TEXT, 'racc/parser.rb', 1) end def embed_library(src) line %[###### #{src.filename} begin] line %[unless $".index '#{src.filename}'] line %[$".push '#{src.filename}'] put src, @params.convert_line? line %[end] line %[###### #{src.filename} end] end def require(feature) line "require '#{feature}'" end def parser_class(classname, superclass) mods = classname.split('::') classid = mods.pop mods.each do \|mod\| indent; line "module #{mod}" cref_push mod end indent; line "class #{classid} < #{superclass}" cref_push classid yield cref_pop indent; line "end \# class #{classid}" mods.reverse_each do \|mod\| cref_pop indent; line "end \# module #{mod}" end end def header @params.header.each do \|src\| line put src, @params.convert_line_all? end end def inner @params.inner.each do \|src\| line put src, @params.convert_line? end end def footer @params.footer.each do \|src\| line put src, @params.convert_line_all? end end # Low Level Routines def put(src, convert_line = false) if convert_line replace_location(src) { @f.puts src.text } else @f.puts src.text end end def line(str = '') @f.puts str end def init_line_conversion_system @cref = [] @used_separator = {} end def cref_push(name) @cref.push name end def cref_pop @cref.pop end def indent @f.print ' ' * @cref.size end def toplevel? @cref.empty? end def replace_location(src) sep = make_separator(src) @f.print 'self.class.' if toplevel? @f.puts "module_eval(<<'#{sep}', '#{src.filename}', #{src.lineno})" yield @f.puts sep end def make_separator(src) sep = unique_separator(src.filename) sep = 2 while src.text.index(sep) sep end def unique_separator(id) sep = String.new "...end #{id}/module_eval..." while @used_separator.key?(sep) sep.concat sprintf('%02x', rand(255)) end @used_separator[sep] = true sep end # # State Transition Table Serialization # public def put_state_transition_table(f) @f = f state_transition_table end private def state_transition_table table = @states.state_transition_table table.use_result_var = @params.result_var? table.debug_parser = @params.debug_parser? line "##### State transition tables begin ###" line integer_list 'racc_action_table', table.action_table line integer_list 'racc_action_check', table.action_check line integer_list 'racc_action_pointer', table.action_pointer line integer_list 'racc_action_default', table.action_default line integer_list 'racc_goto_table', table.goto_table line integer_list 'racc_goto_check', table.goto_check line integer_list 'racc_goto_pointer', table.goto_pointer line integer_list 'racc_goto_default', table.goto_default line i_i_sym_list 'racc_reduce_table', table.reduce_table line line "racc_reduce_n = #{table.reduce_n}" line line "racc_shift_n = #{table.shift_n}" line sym_int_hash 'racc_token_table', table.token_table line line "racc_nt_base = #{table.nt_base}" line line "racc_use_result_var = #{table.use_result_var}" line @f.print(unindent_auto(<<-End)) Racc_arg = [ racc_action_table, racc_action_check, racc_action_default, racc_action_pointer, racc_goto_table, racc_goto_check, racc_goto_default, racc_goto_pointer, racc_nt_base, racc_reduce_table, racc_token_table, racc_shift_n, racc_reduce_n, racc_use_result_var ] End line string_list 'Racc_token_to_s_table', table.token_to_s_table line line "Racc_debug_parser = #{table.debug_parser}" line line '##### State transition tables end #####' actions end def integer_list(name, table) if table.size > 2000 serialize_integer_list_compressed name, table else serialize_integer_list_std name, table end end def serialize_integer_list_compressed(name, table) # TODO: this can be made a LOT more clean with a simple split/map sep = "\n" nsep = ",\n" buf = String.new com = '' ncom = ',' co = com @f.print 'clist = [' table.each do \|i\| buf << co << i.to_s; co = ncom if buf.size > 66 @f.print sep; sep = nsep @f.print "'", buf, "'" buf = String.new co = com end end unless buf.empty? @f.print sep @f.print "'", buf, "'" end line ' ]' @f.print(<<-End) #{name} = arr = ::Array.new(#{table.size}, nil) idx = 0 clist.each do \|str\| str.split(',', -1).each do \|i\| arr[idx] = i.to_i unless i.empty? idx += 1 end end End end def serialize_integer_list_std(name, table) sep = '' line "#{name} = [" table.each_slice(10) do \|ns\| @f.print sep; sep = ",\n" @f.print ns.map {\|n\| sprintf('%6s', n ? n.to_s : 'nil') }.join(',') end line ' ]' end def i_i_sym_list(name, table) sep = '' line "#{name} = [" table.each_slice(3) do \|len, target, mid\| @f.print sep; sep = ",\n" @f.printf ' %d, %d, %s', len, target, mid.inspect end line " ]" end def sym_int_hash(name, h) sep = "\n" @f.print "#{name} = {" h.to_a.sort_by {\|sym, i\| i }.each do \|sym, i\| @f.print sep; sep = ",\n" @f.printf " %s => %d", sym.serialize, i end line " }" end def string_list(name, list) sep = " " line "#{name} = [" list.each do \|s\| @f.print sep; sep = ",\n " @f.print s.dump end line ' ]' end def actions @grammar.each do \|rule\| unless rule.action.source? raise "racc: fatal: cannot generate parser file when any action is a Proc" end end if @params.result_var? decl = ', result' retval = "\n result" default_body = '' else decl = '' retval = '' default_body = 'val[0]' end @grammar.each do \|rule\| line if rule.action.empty? and @params.omit_action_call? line "# reduce #{rule.ident} omitted" else src0 = rule.action.source \|\| SourceText.new(default_body, __FILE__, 0) if @params.convert_line? src = remove_blank_lines(src0) delim = make_delimiter(src.text) @f.printf unindent_auto(<<-End), module_eval(<<'%s', '%s', %d) def _reduce_%d(val, _values%s) %s%s end %s End delim, src.filename, src.lineno - 1, rule.ident, decl, src.text, retval, delim else src = remove_blank_lines(src0) @f.printf unindent_auto(<<-End), def _reduce_%d(val, _values%s) %s%s end End rule.ident, decl, src.text, retval end end end line @f.printf unindent_auto(<<-'End'), decl def _reduce_none(val, _values%s) val[0] end End line end def remove_blank_lines(src) body = src.text.dup line = src.lineno while body.slice!(/\A[ \t\f](?:\n\|\r\n\|\r)/) line += 1 end SourceText.new(body, src.filename, line) end def make_delimiter(body) delim = '.,.,' while body.index(delim) delim = 2 end delim end def unindent_auto(str) lines = str.lines.to_a n = minimum_indent(lines) lines.map {\|line\| detab(line).sub(indent_re(n), '').rstrip + "\n" }.join('') end def minimum_indent(lines) lines.map {\|line\| n_indent(line) }.min end def n_indent(line) line.slice(/\A\s+/).size end RE_CACHE = {} def indent_re(n) RE_CACHE[n] \|\|= /\A {#{n}}/ end def detab(str, ts = 8) add = 0 len = nil str.gsub(/\t/) { len = ts - ($`.size + add) % ts add += len - 1 ' ' len } end end end Back

Edit File : parserfilegenerator.rb | Size : 11.63 KB

#--
#
#
#
# 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".
#
#++

require 'racc/compat'
require 'racc/sourcetext'
require 'racc/parser-text'
require 'rbconfig'

module Racc

class ParserFileGenerator

class Params
      def self.bool_attr(name)
        module_eval(<<-End)
          def #{name}?
            @#{name}
          end

def #{name}=(b)
            @#{name} = b
          end
        End
      end

attr_accessor :filename
      attr_accessor :classname
      attr_accessor :superclass
      bool_attr :omit_action_call
      bool_attr :result_var
      attr_accessor :header
      attr_accessor :inner
      attr_accessor :footer

bool_attr :debug_parser
      bool_attr :convert_line
      bool_attr :convert_line_all
      bool_attr :embed_runtime
      bool_attr :make_executable
      attr_accessor :interpreter

def initialize
        # Parameters derived from parser
        self.filename = nil
        self.classname = nil
        self.superclass = 'Racc::Parser'
        self.omit_action_call = true
        self.result_var = true
        self.header = []
        self.inner  = []
        self.footer = []

# Parameters derived from command line options
        self.debug_parser = false
        self.convert_line = true
        self.convert_line_all = false
        self.embed_runtime = false
        self.make_executable = false
        self.interpreter = nil
      end
    end

def initialize(states, params)
      @states = states
      @grammar = states.grammar
      @params = params
    end

def generate_parser
      string_io = StringIO.new

init_line_conversion_system
      @f = string_io
      parser_file

string_io.rewind
      string_io.read
    end

def generate_parser_file(destpath)
      init_line_conversion_system
      File.open(destpath, 'w') {|f|
        @f = f
        parser_file
      }
      File.chmod 0755, destpath if @params.make_executable?
    end

private

def parser_file
      shebang @params.interpreter if @params.make_executable?
      notice
      line
      if @params.embed_runtime?
        embed_library runtime_source()
      else
        require 'racc/parser.rb'
      end
      header
      parser_class(@params.classname, @params.superclass) {
        inner
        state_transition_table
      }
      footer
    end

c = ::RbConfig::CONFIG
    RUBY_PATH = "#{c['bindir']}/#{c['ruby_install_name']}#{c['EXEEXT']}"

def shebang(path)
      line '#!' + (path == 'ruby' ? RUBY_PATH : path)
    end

def notice
      line %q[#]
      line %q[# DO NOT MODIFY!!!!]
      line %Q[# This file is automatically generated by Racc #{Racc::Version}]
      line %Q[# from Racc grammar file "#{@params.filename}".]
      line %q[#]
    end

def runtime_source
      SourceText.new(::Racc::PARSER_TEXT, 'racc/parser.rb', 1)
    end

def embed_library(src)
      line %[###### #{src.filename} begin]
      line %[unless $".index '#{src.filename}']
      line %[$".push '#{src.filename}']
      put src, @params.convert_line?
      line %[end]
      line %[###### #{src.filename} end]
    end

def require(feature)
      line "require '#{feature}'"
    end

def parser_class(classname, superclass)
      mods = classname.split('::')
      classid = mods.pop
      mods.each do |mod|
        indent; line "module #{mod}"
        cref_push mod
      end
      indent; line "class #{classid} < #{superclass}"
      cref_push classid
      yield
      cref_pop
      indent; line "end   \# class #{classid}"
      mods.reverse_each do |mod|
        cref_pop
        indent; line "end   \# module #{mod}"
      end
    end

def header
      @params.header.each do |src|
        line
        put src, @params.convert_line_all?
      end
    end

def inner
      @params.inner.each do |src|
        line
        put src, @params.convert_line?
      end
    end

def footer
      @params.footer.each do |src|
        line
        put src, @params.convert_line_all?
      end
    end

# Low Level Routines

def put(src, convert_line = false)
      if convert_line
        replace_location(src) {
          @f.puts src.text
        }
      else
        @f.puts src.text
      end
    end

def line(str = '')
      @f.puts str
    end

def init_line_conversion_system
      @cref = []
      @used_separator = {}
    end

def cref_push(name)
      @cref.push name
    end

def cref_pop
      @cref.pop
    end

def indent
      @f.print '  ' * @cref.size
    end

def toplevel?
      @cref.empty?
    end

def replace_location(src)
      sep = make_separator(src)
      @f.print 'self.class.' if toplevel?
      @f.puts "module_eval(<<'#{sep}', '#{src.filename}', #{src.lineno})"
      yield
      @f.puts sep
    end

def make_separator(src)
      sep = unique_separator(src.filename)
      sep *= 2 while src.text.index(sep)
      sep
    end

def unique_separator(id)
      sep = String.new "...end #{id}/module_eval..."
      while @used_separator.key?(sep)
        sep.concat sprintf('%02x', rand(255))
      end
      @used_separator[sep] = true
      sep
    end

#
    # State Transition Table Serialization
    #

public

def put_state_transition_table(f)
      @f = f
      state_transition_table
    end

private

def state_transition_table
      table = @states.state_transition_table
      table.use_result_var = @params.result_var?
      table.debug_parser = @params.debug_parser?

line "##### State transition tables begin ###"
      line
      integer_list 'racc_action_table', table.action_table
      line
      integer_list 'racc_action_check', table.action_check
      line
      integer_list 'racc_action_pointer', table.action_pointer
      line
      integer_list 'racc_action_default', table.action_default
      line
      integer_list 'racc_goto_table', table.goto_table
      line
      integer_list 'racc_goto_check', table.goto_check
      line
      integer_list 'racc_goto_pointer', table.goto_pointer
      line
      integer_list 'racc_goto_default', table.goto_default
      line
      i_i_sym_list 'racc_reduce_table', table.reduce_table
      line
      line "racc_reduce_n = #{table.reduce_n}"
      line
      line "racc_shift_n = #{table.shift_n}"
      line
      sym_int_hash 'racc_token_table', table.token_table
      line
      line "racc_nt_base = #{table.nt_base}"
      line
      line "racc_use_result_var = #{table.use_result_var}"
      line
      @f.print(unindent_auto(<<-End))
        Racc_arg = [
          racc_action_table,
          racc_action_check,
          racc_action_default,
          racc_action_pointer,
          racc_goto_table,
          racc_goto_check,
          racc_goto_default,
          racc_goto_pointer,
          racc_nt_base,
          racc_reduce_table,
          racc_token_table,
          racc_shift_n,
          racc_reduce_n,
          racc_use_result_var ]
      End
      line
      string_list 'Racc_token_to_s_table', table.token_to_s_table
      line
      line "Racc_debug_parser = #{table.debug_parser}"
      line
      line '##### State transition tables end #####'
      actions
    end

def integer_list(name, table)
      if table.size > 2000
        serialize_integer_list_compressed name, table
      else
        serialize_integer_list_std name, table
      end
    end

def serialize_integer_list_compressed(name, table)
      # TODO: this can be made a LOT more clean with a simple split/map
      sep  = "\n"
      nsep = ",\n"
      buf  = String.new
      com  = ''
      ncom = ','
      co   = com
      @f.print 'clist = ['
      table.each do |i|
        buf << co << i.to_s; co = ncom
        if buf.size > 66
          @f.print sep; sep = nsep
          @f.print "'", buf, "'"
          buf = String.new
          co = com
        end
      end
      unless buf.empty?
        @f.print sep
        @f.print "'", buf, "'"
      end
      line ' ]'

@f.print(<<-End)
        #{name} = arr = ::Array.new(#{table.size}, nil)
        idx = 0
        clist.each do |str|
          str.split(',', -1).each do |i|
            arr[idx] = i.to_i unless i.empty?
            idx += 1
          end
        end
      End
    end

def serialize_integer_list_std(name, table)
      sep = ''
      line "#{name} = ["
      table.each_slice(10) do |ns|
        @f.print sep; sep = ",\n"
        @f.print ns.map {|n| sprintf('%6s', n ? n.to_s : 'nil') }.join(',')
      end
      line ' ]'
    end

def i_i_sym_list(name, table)
      sep = ''
      line "#{name} = ["
      table.each_slice(3) do |len, target, mid|
        @f.print sep; sep = ",\n"
        @f.printf '  %d, %d, %s', len, target, mid.inspect
      end
      line " ]"
    end

def sym_int_hash(name, h)
      sep = "\n"
      @f.print "#{name} = {"
      h.to_a.sort_by {|sym, i| i }.each do |sym, i|
        @f.print sep; sep = ",\n"
        @f.printf "  %s => %d", sym.serialize, i
      end
      line " }"
    end

def string_list(name, list)
      sep = "  "
      line "#{name} = ["
      list.each do |s|
        @f.print sep; sep = ",\n  "
        @f.print s.dump
      end
      line ' ]'
    end

def actions
      @grammar.each do |rule|
        unless rule.action.source?
          raise "racc: fatal: cannot generate parser file when any action is a Proc"
        end
      end

if @params.result_var?
        decl = ', result'
        retval = "\n    result"
        default_body = ''
      else
        decl = ''
        retval = ''
        default_body = 'val[0]'
      end
      @grammar.each do |rule|
        line
        if rule.action.empty? and @params.omit_action_call?
          line "# reduce #{rule.ident} omitted"
        else
          src0 = rule.action.source || SourceText.new(default_body, __FILE__, 0)
          if @params.convert_line?
            src = remove_blank_lines(src0)
            delim = make_delimiter(src.text)
            @f.printf unindent_auto(<<-End),
              module_eval(<<'%s', '%s', %d)
                def _reduce_%d(val, _values%s)
                  %s%s
                end
              %s
            End
                      delim, src.filename, src.lineno - 1,
                        rule.ident, decl,
                        src.text, retval,
                      delim
          else
            src = remove_blank_lines(src0)
            @f.printf unindent_auto(<<-End),
              def _reduce_%d(val, _values%s)
              %s%s
              end
            End
                      rule.ident, decl,
                      src.text, retval
          end
        end
      end
      line
      @f.printf unindent_auto(<<-'End'), decl
        def _reduce_none(val, _values%s)
          val[0]
        end
      End
      line
    end

def remove_blank_lines(src)
      body = src.text.dup
      line = src.lineno
      while body.slice!(/\A[ \t\f]*(?:\n|\r\n|\r)/)
        line += 1
      end
      SourceText.new(body, src.filename, line)
    end

def make_delimiter(body)
      delim = '.,.,'
      while body.index(delim)
        delim *= 2
      end
      delim
    end

def unindent_auto(str)
      lines = str.lines.to_a
      n = minimum_indent(lines)
      lines.map {|line| detab(line).sub(indent_re(n), '').rstrip + "\n" }.join('')
    end

def minimum_indent(lines)
      lines.map {|line| n_indent(line) }.min
    end

def n_indent(line)
      line.slice(/\A\s+/).size
    end

RE_CACHE = {}

def indent_re(n)
      RE_CACHE[n] ||= /\A {#{n}}/
    end

def detab(str, ts = 8)
      add = 0
      len = nil
      str.gsub(/\t/) {
        len = ts - ($`.size + add) % ts
        add += len - 1
        ' ' * len
      }
    end

end

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