+def revert_unicode_line(document, i, insets, spec_chars, replacement_character = '???'):
+ # Define strings to start and end ERT and math insets
+ ert_intro='\n\n\\begin_inset ERT\nstatus collapsed\n\\begin_layout %s\n\\backslash\n' % document.default_layout
+ ert_outro='\n\\end_layout\n\n\\end_inset\n'
+ math_intro='\n\\begin_inset Formula $'
+ math_outro='$\n\\end_inset'
+
+ mod_line = u''
+ if i and not is_inset_line(document, i-1):
+ last_char = document.body[i - 1][-1:]
+ else:
+ last_char = ''
+
+ line = document.body[i]
+ for character in line:
+ try:
+ # Try to write the character
+ dummy = character.encode(document.encoding)
+ mod_line += character
+ last_char = character
+ except:
+ # Try to replace with ERT/math inset
+ if spec_chars.has_key(character):
+ command = spec_chars[character][0] # the command to replace unicode
+ flag1 = spec_chars[character][1]
+ flag2 = spec_chars[character][2]
+ if flag1.find('combining') > -1 or flag2.find('combining') > -1:
+ # We have a character that should be combined with the previous
+ command += '{' + last_char + '}'
+ # Remove the last character. Ignore if it is whitespace
+ if len(last_char.rstrip()):
+ # last_char was found and is not whitespace
+ if mod_line:
+ mod_line = mod_line[:-1]
+ else: # last_char belongs to the last line
+ document.body[i-1] = document.body[i-1][:-1]
+ else:
+ # The last character was replaced by a command. For now it is
+ # ignored. This could be handled better.
+ pass
+ if command[0:2] == '\\\\':
+ if command[2:12]=='ensuremath':
+ if insets and insets[-1] == "ERT":
+ # math in ERT
+ command = command.replace('\\\\ensuremath{\\\\', '$\n\\backslash\n')
+ command = command.replace('}', '$\n')
+ elif not insets or insets[-1] != "Formula":
+ # add a math inset with the replacement character
+ command = command.replace('\\\\ensuremath{\\', math_intro)
+ command = command.replace('}', math_outro)
+ else:
+ # we are already in a math inset
+ command = command.replace('\\\\ensuremath{\\', '')
+ command = command.replace('}', '')
+ else:
+ if insets and insets[-1] == "Formula":
+ # avoid putting an ERT in a math; instead put command as text
+ command = command.replace('\\\\', '\mathrm{')
+ command = command + '}'
+ elif not insets or insets[-1] != "ERT":
+ # add an ERT inset with the replacement character
+ command = command.replace('\\\\', ert_intro)
+ command = command + ert_outro
+ else:
+ command = command.replace('\\\\', '\n\\backslash\n')
+ last_char = '' # indicate that the character should not be removed
+ mod_line += command
+ else:
+ # Replace with replacement string
+ mod_line += replacement_character
+ return mod_line
+
+