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path: root/support/rfil/lib/rfil/tex/vf.rb
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# vf.rb -- Class that models TeX's virtual fonts.
#--
# Last Change: Tue May 16 17:32:53 2006
#++

require 'rfil/tex/tfm'
require 'rfil/tex/kpathsea'

module RFIL
  module TeX

    # The vf (virtual font) files are described in vftovp and vptovf. They
    # are always connected with a tfm file that hold the font metric. The
    # vf contain some redundant information copied from the tfm file.
    # Since the VF class is derived from the TFM class, there is no need
    # to duplicate these pieces of information.

    class VF < TFM
      # This class is not meant to be used directly by the programmer. It
      # is used in the VF class to read a virtual font from a file.

      class VFReader
        def initialize(vfobj)
          @vfobj= vfobj || VF.new
          @stack=[[0,0,0,0]]
          push
          @index=0
          @dviindex=nil
        end

        # _vfdata_ is a string with the contents of the vf (binary) file.
        # Return a VF object filled with the information of the virtual
        # font. Does not read the tfm data. It is safe to parse tfm data
        # after parsing the virtual font. 
        def parse(vfdata)
          raise ArgumentError, "I expect a string" unless vfdata.respond_to?(:unpack)
          @index=0
          @kpse=Kpathsea.new
          @data=vfdata.unpack("C*")

          raise VFError, "This does not look like a vf to me" if 247 != get_byte
          raise VFError, "Unknown VF version" unless  202 == get_byte

          @vfobj.vtitle=get_chars(get_byte)

          tfmcksum = get_qbyte
          tfmdsize = get_fix_word

          while b=get_byte
            case b
            when 0..241
              @index -= 1
              parse_char(:short)
            when 242
              parse_char(:long)
            when 243,244,245,246
              # jippie, a (map)font
              fontnumber=get_bytes(243-b+1,false)
              # perhaps we should actually load the tfm instead of saving
              # the metadata?         
              @vfobj.fontlist[fontnumber]={}
              checksum=get_qbyte
              # @vfobj.fontlist[fontnumber][:checksum]=checksum
              scale=get_fix_word
              @vfobj.fontlist[fontnumber][:scale]=scale
              dsize = get_fix_word
              # @vfobj.fontlist[fontnumber][:designsize]=dsize
              a = get_byte   # length of area (directory?)
              l = get_byte   # length of fontname
              area=get_chars(a)
              name=get_chars(l)
              # @vfobj.fontlist[fontnumber][:name]=name
              @kpse.open_file(name,'tfm') { |file|
                @vfobj.fontlist[fontnumber][:tfm]=TFM.new.read_tfm(file)
              }
            when 248
              parse_postamble
            else
              raise VFError, "unknown instruction number #{b.inspect}"
            end
          end
          return @vfobj
        end # parse
        
        
        #######
        private
        #######
        
        def parse_postamble
          while get_byte
          end
        end
        # type: :long, :short
        def parse_char(type)
          instructions=[]
          case type
          when :long
            pl=get_qbyte
            cc=get_qbyte
            tfm=out_as_fix(get_bytes(4,true,@index))
            @index+=4
          when :short
            pl=get_byte
            cc=get_byte
            tfm=out_as_fix(get_bytes(3,true,@index))
            @index+=3
          else 
            raise ArgumentError,"unknown type: #{type}"
          end
          dvi=@data[(@index..@index+pl-1)]
          @dviindex=@index
          @index += pl
          while i = get_byte(@dviindex) and @dviindex < @index
            case i
            when 0
              # setchar 0
              raise "not implementd"
            when 1..127
              instructions << [:setchar, i]
            when 128..131
              c=4-(131-i)
              instructions << [:setchar, get_bytes(c,false,@dviindex+1)]
              @dviindex += c
            when 132,137
              x=out_as_fix(get_bytes(4,true,@dviindex+1))
              y=out_as_fix(get_bytes(4,true,@dviindex+5))
              instructions << [:setrule,x,y]
              @dviindex += 8
            when 133..136
              # are these ever used?
              c=4-(136-i)
              instructions << [:setchar, get_bytes(c,false,@dviindex+1)]
              @dviindex += c
            when 138
              # nop
            when 139,140
              raise VFError, "illegal instruction in VF: #{i}"
            when 141
              instructions << [:push]
              push
            when 142 
              instructions << [:pop]
              pop
            when 143..146
              c=4-(146-i)
              b=out_as_fix(get_bytes(c,true,@dviindex+1))
              instructions << [:moveright, b]
              @dviindex += c
            when 147
              instructions << [:moveright, _w]
            when 148..151
              c=4-(151-i)
              self._w=out_as_fix(get_bytes(c,true,@dviindex+1))
              instructions << [:moveright,_w]
              @dviindex += c
            when 152
              instructions << [:moveright, _x]
            when 153..156
              c=4-(156-i)
              x=out_as_fix(get_bytes(c,true,@dviindex+1))
              self._x=x
              instructions << [:moveright,x]
              @dviindex += c
            when 157..160
              # are these really used?
              c=i-157+1
              v=out_as_fix(get_bytes(c,true,@dviindex+1))
              instructions << [:movedown,v]
              @dviindex += c
            when 161
              instructions << [:movedown, _y]
            when 162..165
              c=i-162+1
              self._y = out_as_fix(get_bytes(c,true,@dviindex+1))
              instructions << [:movedown,_y]
              @dviindex += c
              # puts "#{i} movedown y #{_y}"
            when 166
              instructions << [:movedown, _z]
            when 167..170
              c=i-167+1
              self._z = out_as_fix(get_bytes(c,true,@dviindex+1))
              instructions << [:movedown,_z]
              @dviindex += c
              # puts "#{i} movedown z #{_z}"
            when 171..234
              instructions << [:selectfont, 63-234+i]
            when 235..238
              c=i-235+1
              instructions << [:selectfont, get_bytes(c,true,@dviindex+1)]
              @dviindex += c
            when 239..242
              c=i-239+1
              k=get_bytes(c,true,@dviindex+1)
              if k < 0
                raise VFError, "length of special is negative"
              end
              instructions << [:special, get_chars(k,@dviindex+2)]
              @dviindex += 1+k
            when 243..255
              raise VFError, "illegal instruction in VF: #{i}"
            else
              raise "not implemented: #{i}"
            end
            @dviindex += 1
          end
          # puts "charcode=#{cc} (octal #{sprintf("%o",cc)})"
          tmp=if @vfobj.chars[cc]
                @vfobj.chars[cc]
              else
                Hash.new
              end
          @vfobj.chars[cc]=tmp
          tmp[:dvi]=instructions
        end
        def push
          top=@stack[-1]
          @stack.push top.dup
        end
        def pop
          if @stack.size < 2
            raise VFError, "more pop then push on stack"
          end
          return @stack.pop
        end
        def _w=(value)
          @stack[-1][0]=value
        end
        def _w
          @stack[-1][0]
        end
        def _x=(value)
          @stack[-1][1]=value
        end
        def _x
          @stack[-1][1]
        end

        def _y=(value)
          @stack[-1][2]=value
        end
        def _y
          @stack[-1][2]
        end

        def _z=(value)
          @stack[-1][3]=value
        end
        def _z
          @stack[-1][3]
        end
        
        def get_byte(i=nil)
          global = i==nil
          i = @index if global
          r=@data[i]
          @index += 1  if global
          r
        end
        # 16 bit integer
        def get_dbyte(i=nil)
          global = i == nil
          i = @index if global
          r = (@data[i] << 8) + @data[i + 1]
          @index += 2 if global
          r
        end
        # 24 bit int
        def get_tbyte(i=nil)
          global = i == nil
          i = @index if global
          r = (@data[i] << 16) + (@data[i] << 8) + @data[i + 1]
          @index += 3 if global
          r
        end
        # signed 24 bit int
        def get_stbyte(i=nil)
          global = i == nil
          i = @index if global
          r = if @data[i] < 128
                (@data[i] << 16) + (@data[i] << 8) + @data[i + 1]
              else
                ((256 - @data[i]) << 16) + (@data[i] << 8) + @data[i + 1]
              end
          @index += 3 if global
          r
        end

        # 32 bit integer
        def get_qbyte
          r = (@data[@index] << 24) + (@data[@index+1] << 16) + (@data[@index+2] << 8) + @data[@index+3]
          @index += 4
          r
        end
        # Read a string with at most count bytes. Does not add \0 to the string.
        def get_chars(count,i=nil)
          ret=""
          global = i==nil
          i = @index if global
          
          count.times { |coumt|
            c=@data[i + coumt]
            ret << c.chr if c > 0
          }
          @index += count if global
          return ret.size==0  ? nil : ret 
        end
        def get_bytes(count,signed,i=nil)
          global = i==nil 
          i=@index if global
          a=@data[i]
          if (count==4) or signed
            if a >= 128
              a -= 256
            end
          end
          i +=1
          while count > 1
            a = a * 256 + @data[i]
            i +=1
            count -=1
          end
          @index += count if global
          return a
        end
        def out_as_fix(x)
          raise VFError if x.abs >= 0100000000
          # let's misuse @data -> change
          if x>=0 then @data[0]=0
          else
            @data[0]=255
            x += 0100000000
          end
          3.downto(1) { |k|
            @data[k]=x % 256
            x = x.div(256)
          }
          get_fix_word(0)      
        end
        def get_fix_word(i=nil)
          global = i==nil
          i = @index if global
          b=@data[(i..i+3)]
          @index += 4 if global
          a= (b[0] * 16) + (b[1].div 16)
          f= ((b[1] % 16) * 0400 + b[2] ) * 0400 + b[3]

          str = ""
          if a > 03777
            str << "-"
            a = 010000 - a
            if f > 0
              f = 04000000 - f
              a -= 1
            end
          end
          # Knuth, TFtoPL §42

          delta = 10
          f=10*f+5
          
          str << a.to_s + "."
          begin 
            if delta > 04000000
              f = f + 02000000 - ( delta / 2 )
            end
            str << (f / 04000000).to_s
            f = 10 * ( f % 04000000)
            delta *= 10
          end until f <= delta 
          str.to_f
        end

      end

      
      class VFWriter
        attr_accessor :verbose
        def initialize(vfobject)
          @vf=vfobject
        end

        def to_data
          # preamble
          @data=[247,202]
          @data += out_string(@vf.vtitle)
          @data += out_qbyte(@vf.checksum)
          @data += out_fix_word(@vf.designsize)

          # fonts
          @vf.fontlist.each_with_index { |f,i|
            count,*bytes=out_n_bytes(i)
            @data += [242+count]
            @data += bytes

            @data+=out_qbyte(f[:tfm].checksum)
            @data+=out_fix_word(f[:scale])
            @data+=out_fix_word(f[:tfm].designsize)
            @data+=[0]
            @data += out_string(f[:tfm].tfmfilename.chomp('.tfm'))
          }
          
          # now for the chars
          @vf.chars.each_with_index { |c,i|
            next unless c
            dvi=out_instructions(c[:dvi])
            pl=dvi.length
            tfm=c[:charwd]
            if  pl < 242 and tfm < 16.0 and tfm > 0 and i < 256
              @data << pl
              @data << i
              @data += out_fix_word(tfm,3)
            else
              @data << 242
              @data += out_qbyte(pl)
              @data += out_qbyte(i)
              @data += out_fix_word(tfm)
            end
            @data += dvi
          }
          @data << 248
          while @data.size % 4 != 0
            @data << 248
          end
          return @data.pack("C*")
        end

        #######
        private
        #######

        def out_instructions(instructionlist)
          ret=[]
          instructionlist.each { |i|
            case i[0]
            when :setchar
              charnum=i[1]
              if charnum < 128
                ret << charnum
              elsif charnum > 255
                raise VFError, "TeX does not know about chars > 8bit"
              else
                ret << 128
                ret << charnum
              end
            when :setrule
              ret << 132
              ret += out_fix_word(i[1])
              ret += out_fix_word(i[2])
            when :noop
              ret << 138
            when :push
              ret << 141
            when :pop
              ret << 142
            when :moveright
              # should we choose another moveright? --pg
              ret << 156
              ret += out_fix_word(i[1])
            when :movedown
              ret << 165
              ret += out_fix_word(i[1])
            when :special
              len,*data=out_string(i[1])
              blen,bytes = out_n_bytes(len)
              ret << blen+238
              ret << bytes
              ret += data
            else
              raise VFError, "not implemented"
            end
          }
          ret
        end

        def out_n_bytes(int)
          case 
          when (int < 0), (int >= 0100000000)
            [4] + out_sqbyte(int)
          when int >= 0200000
            [3] + out_tbyte(int)
          when int >= 0400
            [2] + out_dbyte(int)
          else
            [1,int]
          end
        end
        def out_dbyte(int)
          a1=int % 256
          a0=int / 256
          return [a0,a1]
        end
        def out_tbyte(int)
          a2 = int % 256
          int = int / 256
          a1=int % 256
          a0=int / 256
          return [a0,a1,a2]
        end
        def out_qbyte(int)
          a3=int % 256
          int = int / 256
          a2 = int % 256
          int = int / 256
          a1=int % 256
          a0=int / 256
          return [a0,a1,a2,a3]
        end
        # signed four bytes
        def out_sqbyte(int)
          a3=int % 256
          int = int / 256
          a2 = int % 256
          int = int / 256
          a1=int % 256
          a0=int / 256
          if int < 0
            a0 = 256 + a0
          end
          return [a0,a1,a2,a3]
        end
        def out_fix_word(b,bytes=4)
          # a=int part, f=after dec point
          a=b.truncate
          f=b-a
          if b <  0
            f = 1 - f.abs
            a = a -1
          end
          x=(2**20.0*f).round
          a3=x.modulo(256)
          # x >>= 8
          x=x/256
          a2=x % 256
          # x >>= 8
          x = x >> 8
          a1=x % 16
          a1 += (a % 16) << 4
          a0=b < 0 ? 256 + a / 16 : a / 16
          if bytes == 3
            [a1, a2, a3]
          else
            [a0,a1, a2, a3]
          end
        end

        def out_string(string)
          unless string
            return [0]
          end
          ret=[string.length]
          string.each_byte { |s|
            ret << s
          }
          return ret
        end
      end

      
      # Parse a vpl (virtual property list) file. See also TFM::PLParser.
      class VPLParser < PLParser
        # _vfobj_ is an initialized object of the VF class. Call
        # parse(fileobj) to fill the VF object.
        def initialize(vfobj)
          @vf=vfobj
          super
          @syntax["VTITLE"] =:get_vtitle
          @syntax["MAPFONT"]=:get_mapfont
        end

        #######
        private
        #######

        def get_vtitle
          @vf.vtitle=get_string
        end
        def get_mapfont
          @vf.fontlist=[]
          t = @vf.fontlist[get_num] = {}
          t[:tfm]=TFM.new
          thislevel=@level
          while @level >= thislevel
            case k=keyword
            when "FONTNAME"
              t[:tfm].tfmpathname=get_string
            when "FONTCHECKSUM"
              t[:tfm].checksum=get_num
            when "FONTAT"
              t[:scale]=get_num
            when "FONTDSIZE"
              t[:tfm].designsize=get_num
            else
              raise "Unknown property in MAPFONT section: #{k}"
            end
          end
        end # get_mapfont

        # we copy this from tfm.rb, because now MAP is also allowed
        def get_character
          thischar = @tfm.chars[get_num] ||= {}
          thislevel=@level
          while @level >= thislevel
            case k=keyword
            when "COMMENT"
              get_balanced
              eat_closing_paren
            when "CHARWD","CHARHT","CHARDP","CHARIC"
              thischar[k.downcase.to_sym]=get_num
            when "MAP"
              instr=thischar[:dvi]=[]
              maplevel=@level
              while @level >= maplevel
                case ik=keyword
                when "SELECTFONT"
                  instr << [:selectfont, get_num]
                when "SETCHAR"
                  instr << [:setchar, get_num]
                when "SETRULE"
                  instr << [:setrule, get_num, get_num]
                when "MOVEDOWN"
                  instr << [:movedown, get_num]
                when "MOVERIGHT"
                  instr << [:moveright, get_num]
                when "PUSH"
                  instr << [:push]
                  eat_closing_paren
                when "POP"
                  instr << [:pop]
                  eat_closing_paren
                when "SPECIAL"
                  instr << [:special, get_balanced]
                  # puts "special, #{get_balanced}"
                  eat_closing_paren
                else
                  raise "Unknown instruction in character/map section: #{ik}"
                end
              end
            else
              raise "Unknown property in pl file/character section: #{k}"
            end
          end
        end # get_character
      end
      
      

      # VF class
      
      # Raise this exception if an error related to the virtual font is
      # encountered. Don't expect this library to be too clever at the beginning.
      class VFError < Exception
      end

      def self.documented_as_accessor(*args) #:nodoc:
      end
      def self.documented_as_reader(*args) #:nodoc:
      end

      # Filename sans path of the vf file. To change this attribute, set
      # vfpathname. 
      documented_as_reader :vffilename

      # Path to the vf file.
      attr_accessor :vfpathname


      # fontlist is an array of Hashes with the following keys:
      # [<tt>:scale</tt>] Relative size of the font
      # [<tt>:tfm</tt>] TFM object.
      attr_accessor :fontlist

      # This is the same Array as in TFM. Besides the keys <tt>:charwd</tt>,
      # <tt>:charht</tt>, <tt>:chardp</tt> and <tt>:charic</tt>, we now have a key
      # <tt>:dvi</tt> that holds all vf instructions.
      documented_as_accessor :chars

      # Comment at the beginning of the vf file. Must be < 256 chars.
      attr_accessor :vtitle

      # Return an empty VF object
      def initialize
        super
        @vtitle=""
        @fontlist=[]
      end

      def vffilename # :nodoc:
        File.basename(@vfpathname)
      end

      # _vplfile_ is a filename (String). (Future: File and String (pathname))
      def read_vpl(vplfilename)
        File.open(vplfilename) { |f|
          parse_vpl(f.read)
        }
        return self
      end
      def parse_vpl(vplstring)
        v=VPLParser.new(self)
        v.parse(vplstring)
        return self
      end

      # _file_ is either a string (pathname) of a File object (must
      # respond to read)
      def read_vf(file)
        p=VFReader.new(self)
        if file.respond_to? :read
          if file.respond_to? :path
            @vfpathname=file.path
          end
          p.parse(file.read)
        else
          # we assume it is a string
          @vfpathname=file
          case file
          when /\.vf$/
            File.open(file) { |f|
              p.parse(f.read)
            }
          else
            raise ArgumentError, "unknown Filetype: #{file}"
          end
        end
        t=TFMReader.new(self)
        @tfmpathname=@vfpathname.chomp(".vf")+".tfm"
        File.open(@tfmpathname){ |f|
          t.parse(f.read)
        }
        return self
      end #read_vf

      # If _overwrite_ is true, we will replace existing files without
      # raising Errno::EEXIST.
      def save(overwrite=false)
        # tfmpathname=@vfpathname.chomp(".vf")+".tfm"
        raise "tfmpathname not set" unless @tfmpathname
        raise Errno::EEXIST if File.exists?(@vfpathname) and not overwrite
        raise Errno::EEXIST if File.exists?(@tfmpathname) and not overwrite
        puts "saving #{@vfpathname}..." if @verbose
        File.open(@vfpathname,"wb") { |f|
          write_vf_file(f)
        }
        puts "saving #{@vfpathname}...done" if @verbose
        puts "saving #{@tfmpathname}..." if @verbose
        File.open(@tfmpathname,"wb") { |f|
          write_tfm_file(f)
        }
        puts "saving #{@tfmpathname}...done" if @verbose

      end

      
      # _file_ is a File object (or something similar, it must
      # respond to <<). Will be moved.
      def write_vf_file(file)
        vfwriter=VFWriter.new(self)
        vfwriter.verbose=@verbose
        file << vfwriter.to_data
      end

      # _file_ is a File object (or something similar, it must
      # respond to <<). Will be moved.
      def write_tfm_file(file)
        tfmwriter=TFMWriter.new(self)
        tfmwriter.verbose=@verbose
        file << tfmwriter.to_data
      end
      # Return vptovf compatible output
      def to_s
        indent="   "
        str=""
        str << out_head(indent)
        str << "(VTITLE #{vtitle})\n"
        str << out_parameters(indent)
        str << out_mapfont(indent)
        str << out_ligtable(indent)
        str << out_chars(indent)
        str
      end

      #######
      private
      #######

      def out_chars(indent)
        str = ""
        chars.each_with_index { |c,i|
          next unless c
          # str << "(CHARACTER O #{sprintf("%o",i)}\n"
          str << "(CHARACTER D %d\n" % i
          [:charwd,:charht,:chardp,:charic].each { |dim|
            str << indent + "(#{dim.to_s.upcase} R #{c[dim]})\n" if c[dim]!=0.0
          }
          if c[:dvi]
            str << indent + "(MAP\n"
            c[:dvi].each { |instr,*rest|
              
              case instr
              when :setchar
                str << indent*2 + "(SETCHAR D %d)\n" % rest[0].to_i
              when :setrule
                str << indent*2 + "(SETRULE R #{rest[0]} R #{rest[1]})\n"
              when :noop
                # ignore
              when :push
                str << indent*2 + "(PUSH)\n"
              when :pop
                str << indent*2 + "(POP)\n"
              when :moveright
                str << indent*2 + "(MOVERIGHT R #{rest[0]})\n"
              when :movedown
                str << indent*2 + "(MOVEDOWN R #{rest[0]})\n"
              when :selectfont
                str << indent*2 + "(SELECTFONT D #{rest[0]})\n"
              when :special
                str << indent*2 + "(SPECIAL #{rest[0]})\n"
              else
                raise "unknown dvi instruction #{instr}"
              end
            }
            str << indent*2 + ")\n"
          end
          str << indent + ")\n"
        }
        str
      end

      def out_mapfont(indent)
        return "" if fontlist.size == 0
        str=""
        
        fontlist.each_with_index { |f,i|
          str << "(MAPFONT D %d\n" % i
          str << indent + "(FONTNAME %s)\n" % f[:tfm].tfmfilename
          str << indent + "(FONTCHECKSUM O %o)\n" % f[:tfm].checksum
          str << indent + "(FONTAT R %f)\n" % (f[:scale] ? f[:scale].to_f : 1.0)
          str << indent + "(FONTDSIZE R %f)\n" % f[:tfm].designsize
          str << indent + ")\n"
        }
        str
      end
    end #class VF

  end #module TeX
end