pyx/dvi/mapfile.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2007-2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2007-2011 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # This file is part of PyX (http://pyx.sourceforge.net/).
   8 #
   9 # PyX is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # PyX is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with PyX; if not, write to the Free Software
  21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  22
  23 import io, logging, os.path, re
  24 from pyx import font, config
  25 from pyx.font import t1file, afmfile, pfmfile
  26 from pyx.dvi import encfile
  27
  28 logger = logging.getLogger("pyx")
  29
  30 class UnsupportedFontFormat(Exception):
  31     pass
  32
  33 class UnsupportedPSFragment(Exception):
  34     pass
  35
  36 class ParseError(Exception):
  37     pass
  38
  39 _marker = object()
  40
  41 class MAPline:
  42
  43     tokenpattern = re.compile(r'"(.*?)("\s+|"$|$)|(.*?)(\s+|$)')
  44
  45     def __init__(self, s):
  46         """ construct font mapping from line s of font mapping file """
  47         self.texname = self.basepsname = self.fontfilename = None
  48
  49         # standard encoding
  50         self.encodingfilename = None
  51
  52         # supported postscript fragments occuring in psfonts.map
  53         # XXX extendfont not yet implemented
  54         self.reencodefont = self.extendfont = self.slant = None
  55
  56         # cache for openend font and encoding
  57         self._font = None
  58         self._encoding = _marker
  59
  60         tokens = []
  61         while len(s):
  62             match = self.tokenpattern.match(s)
  63             if match:
  64                 if match.groups()[0] is not None:
  65                     tokens.append('"%s"' % match.groups()[0])
  66                 else:
  67                     tokens.append(match.groups()[2])
  68                 s = s[match.end():]
  69             else:
  70                 raise ParseError("Cannot tokenize string '%s'" % s)
  71
  72         next_token_is_encfile = False
  73         for token in tokens:
  74             if next_token_is_encfile:
  75                 self.encodingfilename = token
  76                 next_token_is_encfile = False
  77             elif token.startswith("<"):
  78                 if token == "<":
  79                     next_token_is_encfile = True
  80                 elif token.startswith("<<"):
  81                     # XXX: support non-partial download here
  82                     self.fontfilename = token[2:]
  83                 elif token.startswith("<["):
  84                     self.encodingfilename = token[2:]
  85                 elif token.endswith(".pfa") or token.endswith(".pfb"):
  86                     self.fontfilename = token[1:]
  87                 elif token.endswith(".enc"):
  88                     self.encodingfilename = token[1:]
  89                 elif token.endswith(".ttf"):
  90                     raise UnsupportedFontFormat("TrueType font")
  91                 elif token.endswith(".t42"):
  92                     raise UnsupportedFontFormat("Type 42 font")
  93                 else:
  94                     raise ParseError("Unknown token '%s'" % token)
  95             elif token.startswith('"'):
  96                 pscode = token[1:-1].split()
  97                 # parse standard postscript code fragments
  98                 while pscode:
  99                     try:
 100                         arg, cmd = pscode[:2]
 101                     except:
 102                         raise UnsupportedPSFragment("Unsupported Postscript fragment '%s'" % pscode)
 103                     pscode = pscode[2:]
 104                     if cmd == "ReEncodeFont":
 105                         self.reencodefont = arg
 106                     elif cmd == "ExtendFont":
 107                         self.extendfont = arg
 108                     elif cmd == "SlantFont":
 109                         self.slant = float(arg)
 110                     else:
 111                         raise UnsupportedPSFragment("Unsupported Postscript fragment '%s %s'" % (arg, cmd))
 112             else:
 113                 if self.texname is None:
 114                     self.texname = token
 115                 else:
 116                     self.basepsname = token
 117         if self.basepsname is None:
 118             self.basepsname = self.texname
 119
 120     def getfontname(self):
 121         return self.basepsname
 122
 123     def getfont(self):
 124         if self._font is None:
 125             if self.fontfilename is not None:
 126                 with config.open(self.fontfilename, [config.format.type1]) as fontfile:
 127                     t1font = t1file.from_PF_bytes(fontfile.read())
 128                 assert self.basepsname == t1font.name, "corrupt MAP file"
 129                 try:
 130                     with config.open(os.path.splitext(self.fontfilename)[0], [config.format.afm], ascii=True) as metricfile:
 131                         self._font = font.T1font(t1font, afmfile.AFMfile(metricfile))
 132                 except EnvironmentError:
 133                     try:
 134                         # fallback by using the pfm instead of the afm font metric
 135                         # (in all major TeX distributions there is no pfm file format defined by kpsewhich, but
 136                         # we can use the type1 format and search for the file including the expected suffix)
 137                         with config.open("%s.pfm" % os.path.splitext(self.fontfilename)[0], [config.format.type1]) as metricfile:
 138                             self._font = font.T1font(t1font, pfmfile.PFMfile(metricfile, t1font))
 139                     except EnvironmentError:
 140                         # we need to continue without any metric file
 141                         self._font = font.T1font(t1font)
 142             else:
 143                 # builtin font
 144                 with config.open(self.basepsname, [config.format.afm], ascii=True) as metricfile:
 145                     self._font = font.T1builtinfont(self.basepsname, afmfile.AFMfile(metricfile))
 146         return self._font
 147
 148     def getencoding(self):
 149         if self._encoding is _marker:
 150             if self.encodingfilename is not None:
 151                 with config.open(self.encodingfilename, [config.format.tex_ps_header]) as encodingfile:
 152                     ef = encfile.ENCfile(encodingfile.read().decode("ascii", errors="surrogateescape"))
 153                 assert ef.name == "/%s" % self.reencodefont
 154                 self._encoding = ef.vector
 155
 156             else:
 157                 self._encoding = None
 158         return self._encoding
 159
 160     def __str__(self):
 161         return ("'%s' is '%s' read from '%s' encoded as '%s'" %
 162                 (self.texname, self.basepsname, self.fontfile, repr(self.encodingfile)))
 163
 164 # generate fontmap
 165
 166 def readfontmap(filenames):
 167     """ read font map from filename (without path) """
 168     fontmap = {}
 169     for filename in filenames:
 170         with config.open(filename, [config.format.fontmap, config.format.dvips_config], ascii=True) as mapfile:
 171             lineno = 0
 172             for line in mapfile.readlines():
 173                 lineno += 1
 174                 line = line.rstrip()
 175                 if not (line=="" or line[0] in (" ", "%", "*", ";" , "#")):
 176                     try:
 177                         fm = MAPline(line)
 178                     except (ParseError, UnsupportedPSFragment) as e:
 179                         logger.warning("Ignoring line %i in mapping file '%s': %s" % (lineno, filename, e))
 180                     except UnsupportedFontFormat as e:
 181                         pass
 182                     else:
 183                         fontmap[fm.texname] = fm
 184     return fontmap