def consider_interval(self, Begin, End): if Begin > End: raise RegularExpressionException("Character range: '-' requires character with 'lower code' to preceed\n" + \ "found range '%s-%s' which corresponds to %i-%i as unicode code points." % \ (utf8.map_unicode_to_utf8(Begin), utf8.map_unicode_to_utf8(End), Begin, End)) self.match_set.add_interval(Interval(Begin, End))
def __print_set_single_characters(CharSet, Display, ScreenWidth): assert Display in ["hex", "utf8"] if Display == "hex": CharactersPerLine = 8 ColumnWidth = 6 else: CharactersPerLine = 32 ColumnWidth = 2 # just to make sure ... character_list = CharacterList(CharSet) if character_list.is_empty(): sys.stdout.write("<Result = Empty Character Set>\n") return # Avoid memory overflow for very large sets: get character by character last_start_character_of_line = -1 last_horizontal_offset = 0 while 1 + 1 == 2: character_code = character_list.next() if character_code is None: break start_character_of_line = character_code - character_code % CharactersPerLine horizontal_offset = character_code - start_character_of_line if start_character_of_line > last_start_character_of_line + CharactersPerLine: sys.stdout.write("\n...") if start_character_of_line != last_start_character_of_line: sys.stdout.write("\n%05X: " % start_character_of_line) last_horizontal_offset = 0 sys.stdout.write(" " * ColumnWidth * (horizontal_offset - last_horizontal_offset - 1)) if Display == "hex": sys.stdout.write("%05X " % character_code) else: if character_code >= 0x20: sys.stdout.write("%s " % map_unicode_to_utf8(character_code)) else: sys.stdout.write("? ") last_start_character_of_line = start_character_of_line last_horizontal_offset = horizontal_offset
def do(sh): """Transforms an expression of the form [a-z0-9A-Z] into a NumberSet of code points that corresponds to the characters and character ranges mentioned. """ assert sh.__class__.__name__ == "StringIO" \ or sh.__class__.__name__ == "file" def __check_letter(stream, letter): position = stream.tell() if stream.read(1) == letter: return True else: stream.seek(position) return False # check, if the set is thought to be inverse (preceeded by '^') tracker = Tracker() if __check_letter(sh, "^"): tracker.negation_f = True char_code = None quote_checker = DoubleQuoteChecker( ) # Checks for " appearing twice. Some users did use # # constructs such as "-" and ended up in confusing behavior. while 1 + 1 == 2: char_code = utf8.__read_one_utf8_code_from_stream(sh) quote_checker.do(char_code) if char_code == ord("-"): raise RegularExpressionException( "Character range operator '-' requires a preceding character as in 'a-z'." ) elif char_code is None: raise RegularExpressionException( "Missing closing ']' in character range expression.") elif char_code == ord("]"): break elif char_code == ord("\\"): char_code = snap_backslashed_character.do(sh) if not __check_letter(sh, "-"): # (*) Normal character tracker.consider_letter(char_code) else: # (*) Character range: 'character0' '-' 'character1' char_code_2 = utf8.__read_one_utf8_code_from_stream(sh) quote_checker.do(char_code_2) if char_code_2 in [None, ord(']')]: raise RegularExpressionException( "Character range: '-' requires a character following '-'.") elif char_code == ord("-"): raise RegularExpressionException( "Character range operator '-' followed by '-'.") elif char_code_2 == ord("\\"): char_code_2 = snap_backslashed_character.do(sh) # value denotes 'end', i.e first character outside the interval => add 1 if char_code == char_code_2: utf8_string = utf8.map_unicode_to_utf8(char_code) raise RegularExpressionException("Character range '%s-%s' has only one element.\n" \ % (utf8_string, utf8_string) + \ "In this case avoid range expression for clarity.") tracker.consider_interval(char_code, char_code_2 + 1) if char_code is None: break if tracker.negation_f: return tracker.match_set.get_complement(Setup.buffer_codec.source_set) else: return tracker.match_set
def do(sh): """Transforms an expression of the form [a-z0-9A-Z] into a NumberSet of code points that corresponds to the characters and character ranges mentioned. """ assert sh.__class__.__name__ == "StringIO" \ or sh.__class__.__name__ == "file" def __check_letter(stream, letter): position = stream.tell() if stream.read(1) == letter: return True else: stream.seek(position); return False # check, if the set is thought to be inverse (preceeded by '^') tracker = Tracker() if __check_letter(sh, "^"): tracker.negation_f = True char_code = None quote_checker = DoubleQuoteChecker() # Checks for " appearing twice. Some users did use # # constructs such as "-" and ended up in confusing behavior. while 1 + 1 == 2: char_code = utf8.__read_one_utf8_code_from_stream(sh) quote_checker.do(char_code) if char_code == ord("-"): raise RegularExpressionException("Character range operator '-' requires a preceding character as in 'a-z'.") elif char_code is None: raise RegularExpressionException("Missing closing ']' in character range expression.") elif char_code == ord("]"): break elif char_code == ord("\\"): char_code = snap_backslashed_character.do(sh) if not __check_letter(sh, "-"): # (*) Normal character tracker.consider_letter(char_code) else: # (*) Character range: 'character0' '-' 'character1' char_code_2 = utf8.__read_one_utf8_code_from_stream(sh) quote_checker.do(char_code_2) if char_code_2 in [None, ord(']')]: raise RegularExpressionException("Character range: '-' requires a character following '-'.") elif char_code == ord("-"): raise RegularExpressionException("Character range operator '-' followed by '-'.") elif char_code_2 == ord("\\"): char_code_2 = snap_backslashed_character.do(sh) # value denotes 'end', i.e first character outside the interval => add 1 if char_code == char_code_2: utf8_string = utf8.map_unicode_to_utf8(char_code) raise RegularExpressionException("Character range '%s-%s' has only one element.\n" \ % (utf8_string, utf8_string) + \ "In this case avoid range expression for clarity.") tracker.consider_interval(char_code, char_code_2 + 1) if char_code is None: break if tracker.negation_f: return tracker.match_set.get_complement(Setup.buffer_codec.source_set) else: return tracker.match_set