1 files changed, 565 insertions, 0 deletions
diff --git a/tool/transcode-tblgen.rb b/tool/transcode-tblgen.rb
new file mode 100644
index 0000000000..9ef21babe0
--- /dev/null
+++ b/tool/transcode-tblgen.rb
@@ -0,0 +1,565 @@
+require 'optparse'
+require 'erb'
+
+C_ESC = {
+  "\\" => "\\\\",
+  '"' => '\"',
+  "\n" => '\n',
+}
+
+0x00.upto(0x1f) {|ch| C_ESC[[ch].pack("C")] ||= "\\%03o" % ch }
+0x7f.upto(0xff) {|ch| C_ESC[[ch].pack("C")] = "\\%03o" % ch }
+C_ESC_PAT = Regexp.union(*C_ESC.keys)
+
+def c_esc(str)
+  '"' + str.gsub(C_ESC_PAT) { C_ESC[$&] } + '"'
+end
+
+class StrSet
+  def self.parse(pattern)
+    result = []
+    pattern.scan(/\S+/) {|seq|
+      seq_result = []
+      while !seq.empty?
+        if /\A([0-9a-f][0-9a-f])/i =~ seq
+          byte = $1.to_i(16)
+          seq_result << [byte..byte]
+          seq = $'
+        elsif /\A\{([^\}]+)\}/ =~ seq
+          set = $1
+          seq = $'
+          set_result = []
+          set.scan(/[^,]+/) {|range|
+            if /\A([0-9a-f][0-9a-f])-([0-9a-f][0-9a-f])\z/ =~ range
+              b = $1.to_i(16)
+              e = $2.to_i(16)
+              set_result << (b..e)
+            elsif /\A([0-9a-f][0-9a-f])\z/ =~ range
+              byte = $1.to_i(16)
+              set_result << (byte..byte)
+            else
+              raise "invalid range: #{range.inspect}"
+            end
+          }
+          seq_result << set_result
+        else
+          raise "invalid sequence: #{seq.inspect}"
+        end
+      end
+      result << seq_result
+    }
+    self.new(result)
+  end
+
+  def initialize(pat)
+    @pat = pat
+  end
+
+  def hash
+    @pat.hash
+  end
+
+  def eql?(other)
+    self.class == other.class &&
+    @pat == other.instance_eval { @pat }
+  end
+
+  alias == eql?
+
+  def to_s
+    if @pat.empty?
+      "(empset)"
+    elsif @pat == [[]]
+      "(empstr)"
+    else
+      @pat.map {|seq|
+        seq.map {|byteset|
+          if byteset.length == 1 && byteset[0].begin == byteset[0].end
+            "%02x" % byteset[0].begin
+          else
+            "{" + 
+            byteset.map {|range|
+              if range.begin == range.end
+                "%02x" % range.begin
+              else
+                "%02x-%02x" % [range.begin, range.end]
+              end
+            }.join(',') +
+            "}"
+          end
+        }.join('')
+      }.join(' ')
+    end
+  end
+
+  def inspect
+    "\#<#{self.class}: #{self.to_s}>"
+  end
+
+  def emptyable?
+    @pat.any? {|seq|
+      seq.empty?
+    }
+  end
+
+  def first_bytes
+    result = {}
+    @pat.each {|seq|
+      next if seq.empty?
+      seq.first.each {|range|
+        range.each {|byte|
+          result[byte] = true
+        }
+      }
+    }
+    result.keys.sort
+  end
+
+  def each_firstbyte
+    h = {}
+    @pat.each {|seq|
+      next if seq.empty?
+      seq.first.each {|range|
+        range.each {|byte|
+          (h[byte] ||= []) << seq[1..-1]
+        }
+      }
+    }
+    h.keys.sort.each {|byte|
+      yield byte, StrSet.new(h[byte])
+    }
+  end
+end
+
+class ActionMap
+  def self.parse(hash)
+    h = {}
+    hash.each {|pat, action|
+      h[StrSet.parse(pat)] = action
+    }
+    self.new(h)
+  end
+
+  def initialize(h)
+    @map = h
+    @default_action = :undef
+  end
+  attr_accessor :default_action
+
+  def hash
+    hash = 0
+    @map.each {|k,v|
+      hash ^= k.hash ^ v.hash
+    }
+    hash
+  end
+
+  def eql?(other)
+    self.class == other.class &&
+    @map.eql?(other.instance_eval { @map })
+  end
+
+  alias == eql?
+
+  def inspect
+    "\#<#{self.class}:" + 
+    @map.map {|k, v| " [" + k.to_s + "]=>" + v.inspect }.join('') +
+    ">"
+  end
+
+  def empty_action
+    @map.each {|ss, action|
+      return action if ss.emptyable?
+    }
+    nil
+  end
+
+  def each_firstbyte
+    h = {}
+    @map.each {|ss, action|
+      if ss.emptyable?
+        raise "emptyable pattern"
+      else
+        ss.each_firstbyte {|byte, rest|
+          h[byte] ||= {}
+          if h[byte][rest]
+            raise "ambiguous"
+          else
+            h[byte][rest] = action
+          end
+        }
+      end
+    }
+    h.keys.sort.each {|byte|
+      am = ActionMap.new(h[byte])
+      am.default_action = @default_action
+      yield byte, am
+    }
+  end
+
+  OffsetsMemo = {}
+  InfosMemo = {}
+
+  def format_offsets(offsets)
+    code = "{\n"
+    0.step(offsets.length-1,16) {|i|
+      code << "    "
+      code << offsets[i,8].map {|off| "%3d," % off.to_s }.join('')
+      code << "  "
+      code << offsets[i+8,8].map {|off| "%3d," % off.to_s }.join('')
+      code << "\n"
+    }
+    code << '}'
+    code
+  end
+
+  def generate_info(info)
+    case info
+    when :nomap
+      "NOMAP"
+    when :undef
+      "UNDEF"
+    when :invalid
+      "INVALID"
+    when :func_so
+      "FUNso"
+    when /\A([0-9a-f][0-9a-f])\z/i
+      "o1(0x#$1)"
+    when /\A([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])\z/i
+      "o2(0x#$1,0x#$2)"
+    when /\A([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])\z/i
+      "o3(0x#$1,0x#$2,0x#$3)"
+    when /\A([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])\z/i
+      "o4(0x#$1,0x#$2,0x#$3,0x#$4)"
+    else
+      info.to_s
+    end
+  end
+
+  def format_infos(infos)
+    infos = infos.map {|info| generate_info(info) }
+    maxlen = infos.map {|info| info.length }.max
+    columns = maxlen <= 16 ? 4 : 2
+    code = "{\n"
+    0.step(infos.length-1, columns) {|i|
+      code << "    "
+      is = infos[i,columns]
+      is.each {|info|
+        code << sprintf(" %#{maxlen}s,", info)
+      }
+      code << "\n"
+    }
+    code << "}"
+    code
+  end
+
+  def generate_lookup_node(name, table)
+    offsets = []
+    infos = []
+    infomap = {}
+    noaction_bytes = []
+    table.each_with_index {|action, byte|
+      if !action
+        noaction_bytes << byte
+        next
+      end
+      unless o = infomap[action]
+        infomap[action] = o = infos.length
+        infos[o] = action
+      end
+      offsets[byte] = o
+    }
+    if !noaction_bytes.empty?
+      noaction_bytes.each {|byte|
+        offsets[byte] = infos.length
+      }
+      infos << @default_action
+    end
+
+    if n = OffsetsMemo[offsets]
+      offsets_name = n
+      offsets_code = ''
+    else
+      offsets_name = "#{name}_offsets"
+      offsets_code = <<"End"
+static const unsigned char
+#{offsets_name}[#{offsets.length}] = #{format_offsets(offsets)};
+End
+      OffsetsMemo[offsets] = offsets_name
+    end
+
+    if n = InfosMemo[infos]
+      infos_name = n
+      infos_code = ''
+    else
+      infos_name = "#{name}_infos"
+      infos_code = <<"End"
+static const struct byte_lookup* const
+#{infos_name}[#{infos.length}] = #{format_infos(infos)};
+End
+      InfosMemo[infos] = infos_name
+    end
+
+    r = offsets_code + infos_code + <<"End"
+static const BYTE_LOOKUP
+#{name} = {
+    #{offsets_name},
+    #{infos_name}
+};
+
+End
+    r
+  end
+
+  PreMemo = {}
+  PostMemo = {}
+  NextName = "a"
+
+  def generate_node(code, name_hint=nil, ranges=[])
+    ranges = [0x00..0xff] if ranges.empty?
+    range = ranges.first
+    if n = PreMemo[self]
+      return n
+    end
+
+    table = Array.new(range.end - range.begin + 1)
+    each_firstbyte {|byte, rest|
+      unless range === byte
+        raise "byte not in range"
+      end
+      if a = rest.empty_action
+        table[byte-range.begin] = a
+      else
+        name_hint2 = nil
+        name_hint2 = "#{name_hint}_#{'%02X' % byte}" if name_hint
+        table[byte-range.begin] = "&" + rest.generate_node(code, name_hint2, ranges[1..-1])
+      end
+    }
+
+    if n = PostMemo[table]
+      return n
+    end
+
+    if !name_hint
+      name_hint = "fun_" + NextName.dup
+      NextName.succ!
+    end
+
+    PreMemo[self] = PostMemo[table] = name_hint
+
+    code << generate_lookup_node(name_hint, table)
+    name_hint
+  end
+end
+
+def encode_utf8(map)
+  r = []
+  map.each {|k, v|
+    # integer means UTF-8 encoded sequence.
+    k = [k].pack("U").unpack("H*")[0].upcase if Integer === k
+    v = [v].pack("U").unpack("H*")[0].upcase if Integer === v
+    r << [k,v]
+  }
+  r
+end
+
+def transcode_compile_tree(name, from, map)
+  map = encode_utf8(map)
+  h = {}
+  map.each {|k, v|
+    h[k] = v
+  }
+  am = ActionMap.parse(h)
+
+  ranges = from == "UTF-8" ? [0x00..0xff, 0x80..0xbf, 0x80..0xbf, 0x80..0xbf] : []
+  code = ''
+  defined_name = am.generate_node(code, name, ranges)
+  return defined_name, code
+end
+
+TRANSCODERS = []
+
+def transcode_tblgen(from, to, map)
+  id_from = from.tr('^0-9A-Za-z', '_')
+  id_to = to.tr('^0-9A-Za-z', '_')
+  if from == "UTF-8"
+    tree_name = "to_#{id_to}"
+  elsif to == "UTF-8"
+    tree_name = "from_#{id_from}"
+  else
+    tree_name = "from_#{id_from}_to_#{id_to}"
+  end
+  map = encode_utf8(map)
+  real_tree_name, tree_code = transcode_compile_tree(tree_name, from, map)
+  transcoder_name = "rb_#{tree_name}"
+  TRANSCODERS << transcoder_name
+  from_utf8 = from == 'UTF-8' ? 1 : 0
+  max_output = map.map {|k,v| String === v ? v.length/2 : 1 }.max
+  transcoder_code = <<"End"
+static const rb_transcoder
+#{transcoder_name} = {
+    #{c_esc from}, #{c_esc to}, &#{real_tree_name}, #{max_output}, #{from_utf8},
+    NULL, NULL,
+};
+End
+  tree_code + "\n" + transcoder_code
+end
+
+def transcode_register_code
+  code = ''
+  TRANSCODERS.each {|transcoder_name|
+    code << "    rb_register_transcoder(&#{transcoder_name});\n"
+  }
+  code
+end
+
+Universe = {
+  "singlebyte" => "{00-ff}",
+  "doublebyte" => "{00-ff}{00-ff}",
+  "quadruplebyte" => "{00-ff}{00-ff}{00-ff}{00-ff}",
+  "US-ASCII" => "{00-7f}",
+  "EUC-JP" => <<-End,
+    {00-7f}
+    {a1-fe}{a1-fe}
+    8e{a1-fe}
+    8f{a1-fe}{a1-fe}
+  End
+  "EUC-KR" => <<-End,
+    {00-7f}
+    {a1-fe}{a1-fe}
+  End
+  "EUC-TW" => <<-End,
+    {00-7f}
+    {a1-fe}{a1-fe}
+    8e{a1-b0}{a1-fe}{a1-fe}
+  End
+  "Shift_JIS" => <<-End,
+    {00-7f}
+    {81-9f,e0-fc}{40-7e,80-fc}
+    {a1-df}
+  End
+  "Big5" => <<-End,
+    {00-7f}
+    {a1-fe}{40-7e,a1-fe}
+  End
+  "GBK" => <<-End,
+    {00-80}
+    {81-fe}{40-7e,80-fe}
+  End
+  "CP949" => <<-End,
+    {00-80}
+    {81-fe}{41-5a,61-7a,81-fe}
+  End
+  "UTF-8" => <<-End,
+    {00-7f}
+    {c2-df}{80-bf}
+         e0{a0-bf}{80-bf}
+    {e1-ec}{80-bf}{80-bf}
+         ed{80-9f}{80-bf}
+    {ee-ef}{80-bf}{80-bf}
+         f0{90-bf}{80-bf}{80-bf}
+    {f1-f3}{80-bf}{80-bf}{80-bf}
+         f4{80-8f}{80-bf}{80-bf}
+  End
+  "GB18030" => <<-End,
+    {00-7f}
+    {81-fe}{40-7e,80-fe}
+    {81-fe}{30-93}{81-fe}{30-93}
+  End
+  "UTF-16BE" => <<-End,
+    {00-d7,e0-ff}{00-ff}
+    {d8-db}{00-ff}{dc-df}{00-ff}
+  End
+  "UTF-16LE" => <<-End,
+    {00-ff}{00-d7,e0-ff}
+    {00-ff}{d8-db}{00-ff}{dc-df}
+  End
+  "UTF-32BE" => <<-End,
+    0000{00-d7,e0-ff}{00-ff}
+    00{01-10}{00-ff}{00-ff}
+  End
+  "UTF-32LE" => <<-End,
+    {00-ff}{00-d7,e0-ff}0000
+    {00-ff}{00-ff}{01-10}00
+  End
+}
+
+def make_signature(filename, src)
+  "src=#{filename.dump}, len=#{src.length}, checksum=#{src.sum}"
+end
+
+output_filename = nil
+verbose_mode = false
+force_mode = false
+
+op = OptionParser.new
+op.def_option("--help", "show help message") { puts op; exit 0 }
+op.def_option("--verbose", "verbose mode") { verbose_mode = true }
+op.def_option("--force", "force table generation") { force_mode = true }
+op.def_option("--output=FILE", "specify output file") {|arg| output_filename = arg }
+op.parse!
+
+arg = ARGV.shift
+dir = File.dirname(arg)
+$:.unshift dir unless $:.include? dir
+src = File.read(arg)
+src.force_encoding("ascii-8bit") if src.respond_to? :force_encoding
+base_signature = "/* autogenerated. */\n"
+base_signature << "/* #{make_signature(File.basename(arg), src)} */\n"
+
+if !force_mode && output_filename && File.readable?(output_filename)
+  old_signature = File.open(output_filename) {|f| f.gets("").chomp }
+  chk_signature = base_signature.dup
+  old_signature.each_line {|line|
+    if %r{/\* src="([0-9a-z_.-]+)",} =~ line
+      name = $1
+      next if name == File.basename(arg)
+      path = File.join(dir, name)
+      if File.readable? path
+        chk_signature << "/* #{make_signature(name, File.read(path))} */\n"
+      end
+    end
+  }
+  if old_signature == chk_signature
+    now = Time.now
+    File.utime(now, now, output_filename)
+    STDERR.puts "#{output_filename} is already up-to-date." if verbose_mode
+    exit
+  end
+end
+
+if verbose_mode
+  if output_filename
+    STDERR.print "generate #{output_filename} ..."
+  end
+end
+
+libs1 = $".dup
+erb_result = ERB.new(src, nil, '%').result(binding)
+libs2 = $".dup
+
+libs = libs2 - libs1
+lib_sigs = ''
+libs.each {|lib|
+  lib = File.basename(lib)
+  path = File.join(dir, lib)
+  if File.readable? path
+    lib_sigs << "/* #{make_signature(lib, File.read(path))} */\n"
+  end
+}
+
+result = ''
+result << base_signature
+result << lib_sigs
+result << "\n"
+result << erb_result
+result << "\n"
+
+if output_filename
+  new_filename = output_filename + ".new"
+  File.open(new_filename, "w") {|f| f << result }
+  File.rename(new_filename, output_filename)
+  STDERR.puts " done." if verbose_mode
+else
+  print result
+end