pyx/prolog.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2003-2004 Jörg Lehmann <joergl@users.sourceforge.net>
   6 # Copyright (C) 2003-2004 André Wobst <wobsta@users.sourceforge.net>
   7 #
   8 # This file is part of PyX (http://pyx.sourceforge.net/).
   9 #
  10 # PyX is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # PyX is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with PyX; if not, write to the Free Software
  22 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23
  24 """prolog module:
  25
  26 Snippets included in the prolog of a PostScript file, which can be
  27 used as return values of canvasitem instances.
  28
  29 """
  30
  31 import pykpathsea, t1strip
  32
  33 #
  34 # Abstract base class
  35 #
  36
  37 class prologitem:
  38
  39     """Part of the PostScript prolog"""
  40
  41     def merge(self, other):
  42         """ try to merge self with other prologitem
  43
  44         If the merge succeeds, return None. Otherwise return other.
  45         Raise ValueError, if conflicts arise!"""
  46
  47         pass
  48
  49     def outputPS(self, file):
  50         """ write self in file """
  51         pass
  52
  53 #
  54 # Different variants of prolog items
  55 #
  56
  57 class definition(prologitem):
  58
  59     """ PostScript function definition included in the prolog """
  60
  61     def __init__(self, id, body):
  62         self.id = id
  63         self.body = body
  64
  65     def merge(self, other):
  66         if not isinstance(other, definition):
  67             return other
  68         if self.id==other.id:
  69             if self.body==other.body:
  70                 return None
  71             raise ValueError("Conflicting function definitions!")
  72         else:
  73            return other
  74
  75     def outputPS(self, file):
  76         file.write("%%%%BeginRessource: %s\n" % self.id)
  77         file.write("%(body)s /%(id)s exch def\n" % self.__dict__)
  78         file.write("%%EndRessource\n")
  79
  80
  81 class fontdefinition(prologitem):
  82
  83     """ PostScript font definition included in the prolog """
  84
  85     def __init__(self, font, fontname, filename, encfilename, usedchars):
  86         """ include type 1 font defined by the following parameters
  87
  88         - fontname:    PostScript FontName of font
  89         - filename:    name (without path) of file containing the font definition
  90         - encfilename: name (without path) of file containing used encoding of font
  91                        or None (if no encoding file used)
  92         - usechars:    list with 256 elements containing used charcodes of font
  93
  94         """
  95
  96         # Note that here we only need the encoding for selecting the used glyphs!
  97
  98         # XXX rewrite
  99
 100         self.font = font
 101         self.fontname = fontname
 102         self.filename = filename
 103         self.encfilename = encfilename
 104         self.usedchars = usedchars
 105
 106     def merge(self, other):
 107         if not isinstance(other, fontdefinition):
 108             return other
 109         if self.fontname==other.fontname and self.encfilename==other.encfilename:
 110             for i in range(len(self.usedchars)):
 111                 self.usedchars[i] = self.usedchars[i] or other.usedchars[i]
 112             return None
 113         else:
 114             return other
 115
 116     def outputPS(self, file):
 117         if self.filename:
 118             file.write("%%%%BeginFont: %s\n" % self.fontname)
 119             file.write("%Included char codes:")
 120             for i in range(len(self.usedchars)):
 121                 if self.usedchars[i]:
 122                     file.write(" %d" % i)
 123             file.write("\n")
 124             pfbpath = pykpathsea.find_file(self.filename, pykpathsea.kpse_type1_format)
 125             if not pfbpath:
 126                 raise RuntimeError("cannot find type 1 font %s" % self.filename)
 127             if self.encfilename is not None:
 128                 encpath = pykpathsea.find_file(self.encfilename, pykpathsea.kpse_tex_ps_header_format)
 129                 if not encpath:
 130                     raise RuntimeError("cannot find font encoding file %s" % self.encfilename)
 131                 t1strip.t1strip(file, pfbpath, self.usedchars, encpath)
 132             else:
 133                 t1strip.t1strip(file, pfbpath, self.usedchars)
 134             file.write("%%EndFont\n")
 135
 136
 137 class fontencoding(prologitem):
 138
 139     """ PostScript font encoding vector included in the prolog """
 140
 141     def __init__(self, name, filename):
 142         """ include font encoding vector specified by
 143
 144         - name:        name of the encoding
 145         - filename:    name (without path) of file containing the font encoding
 146
 147         """
 148
 149         self.name = name
 150         self.filename = filename
 151
 152     def merge(self, other):
 153         if not isinstance(other, fontencoding):
 154             return other
 155         if self.name==other.name:
 156             if self.filename==other.filename:
 157                 return None
 158             raise ValueError("Conflicting encodings!")
 159         else:
 160            return other
 161
 162     def outputPS(self, file):
 163         file.write("%%%%BeginProcSet: %s\n" % self.name)
 164         path = pykpathsea.find_file(self.filename, pykpathsea.kpse_tex_ps_header_format)
 165         encfile = open(path, "r")
 166         file.write(encfile.read())
 167         encfile.close()
 168         file.write("%%EndProcSet\n")
 169
 170
 171 class fontreencoding(prologitem):
 172
 173     """ PostScript font re-encoding directive included in the prolog """
 174
 175     def __init__(self, fontname, basefontname, encname):
 176         """ include font re-encoding directive specified by
 177
 178         - fontname:     PostScript FontName of the new reencoded font
 179         - basefontname: PostScript FontName of the original font
 180         - encname:      name of the encoding
 181         - font:         a reference to the font instance (temporarily added for pdf support)
 182
 183         Before being able to reencode a font, you have to include the
 184         encoding via a fontencoding prolog item with name=encname
 185
 186         """
 187
 188         self.fontname = fontname
 189         self.basefontname = basefontname
 190         self.encname = encname
 191
 192     def merge(self, other):
 193         if not isinstance(other, fontreencoding):
 194             return other
 195         if self.fontname==other.fontname:
 196             if self.basefontname==other.basefontname and self.encname==other.encname:
 197                 return None
 198             raise ValueError("Conflicting font reencodings!")
 199         else:
 200             return other
 201
 202     def outputPS(self, file):
 203         file.write("%%%%BeginProcSet: %s\n" % self.fontname)
 204         file.write("/%s /%s %s ReEncodeFont\n" % (self.basefontname, self.fontname, self.encname))
 205         file.write("%%EndProcSet\n")