third_party/liblouis/liblouis_list_tables.py

   1 #!/usr/bin/env python
   2 # Copyright 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 import os
   7 import re
   8 import sys
   9
  10 import json
  11 import optparse
  12
  13 # Matches the include statement in the braille table files.
  14 INCLUDE_RE = re.compile(r"^\s*include\s+([^#\s]+)")
  15
  16
  17 def Error(msg):
  18   print >> sys.stderr, 'liblouis_list_tables: %s' % msg
  19   sys.exit(1)
  20
  21
  22 def ToNativePath(pathname):
  23   return os.path.sep.join(pathname.split('/'))
  24
  25
  26 def LoadTablesFile(filename):
  27   with open(ToNativePath(filename), 'r') as fh:
  28     try:
  29       return json.load(fh)
  30     except ValueError, e:
  31       raise ValueError('Error parsing braille table file %s: %s' %
  32                        (filename, e.message))
  33
  34
  35 def FindFile(filename, directories):
  36   for d in directories:
  37     fullname = '/'.join([d, filename])
  38     if os.path.isfile(ToNativePath(fullname)):
  39       return fullname
  40   Error('File not found: %s' % filename)
  41
  42
  43 def GetIncludeFiles(filename):
  44   result = []
  45   with open(ToNativePath(filename), 'r') as fh:
  46     for line in fh.xreadlines():
  47       match = INCLUDE_RE.match(line)
  48       if match:
  49         result.append(match.group(1))
  50   return result
  51
  52
  53 def ProcessFile(output_set, filename, directories):
  54   fullname = FindFile(filename, directories)
  55   if fullname in output_set:
  56     return
  57   output_set.add(fullname)
  58   for include_file in GetIncludeFiles(fullname):
  59     ProcessFile(output_set, include_file, directories)
  60
  61
  62 def GetTableFiles(tables_file, directories, extra_files):
  63   tables = LoadTablesFile(tables_file)
  64   output_set = set()
  65   for table in tables:
  66     for name in table['fileNames'].split(','):
  67       ProcessFile(output_set, name, directories)
  68   for name in extra_files:
  69     ProcessFile(output_set, name, directories)
  70   return output_set
  71
  72
  73 def DoMain(argv):
  74   "Entry point for gyp's pymod_do_main command."
  75   parser = optparse.OptionParser()
  76   # Give a clearer error message when this is used as a module.
  77   parser.prog = 'liblouis_list_tables'
  78   parser.set_usage('usage: %prog [options] listfile')
  79   parser.add_option('-D', '--directory', dest='directories',
  80                      action='append', help='Where to search for table files')
  81   parser.add_option('-e', '--extra_file', dest='extra_files', action='append',
  82                     default=[], help='Extra liblouis table file to process')
  83   (options, args) = parser.parse_args(argv)
  84
  85   if len(args) != 1:
  86     parser.error('Expecting exactly one argument')
  87   if not options.directories:
  88     parser.error('At least one --directory option must be specified')
  89   files = GetTableFiles(args[0], options.directories, options.extra_files)
  90   return '\n'.join(files)
  91
  92
  93 def main(argv):
  94   print DoMain(argv[1:])
  95
  96
  97 if __name__ == '__main__':
  98   try:
  99     sys.exit(main(sys.argv))
 100   except KeyboardInterrupt:
 101     Error('interrupted')