def get_character_code_sequence(sh):
assert sh.__class__.__name__ == "StringIO" \
or sh.__class__.__name__ == "file"
# Only \" is a special character '"', any other backslashed character
# remains as the sequence 'backslash' + character
sequence = []
while 1 + 1 == 2:
char_code = utf8.__read_one_utf8_code_from_stream(sh)
if char_code is None:
raise RegularExpressionException(
"End of file reached while parsing quoted string.")
elif char_code == ord("\\"):
char_code = snap_backslashed_character.do(sh)
if char_code is None:
raise RegularExpressionException(
"Unidentified backslash-sequence in quoted string.")
elif char_code == ord('"'):
break
sequence.append(char_code)
return sequence
def snap_non_control_character(stream, PatternDict):
__debug_entry("non-control characters", stream)
# (*) read first character
char_code = utf8.__read_one_utf8_code_from_stream(stream)
if char_code is None:
error_msg("Character could not be interpreted as UTF8 code or End of File reached prematurely.",
stream)
result = StateMachine()
result.add_transition(result.init_state_index, char_code, AcceptanceF=True)
return __debug_exit(result, stream)
def snap_non_control_character(stream, PatternDict):
__debug_entry("non-control characters", stream)
# (*) read first character
char_code = utf8.__read_one_utf8_code_from_stream(stream)
if char_code is None:
error_msg("Character could not be interpreted as UTF8 code or End of File reached prematurely.",
stream)
result = StateMachine()
result.add_transition(result.init_state_index, char_code, AcceptanceF=True)
return __debug_exit(result, stream)
def read_character_code(fh):
# NOTE: This function is tested with the regeression test for feature request 2251359.
# See directory $QUEX_PATH/TEST/2251359.
pos = fh.tell()
start = fh.read(1)
if start == "":
fh.seek(pos); return -1
elif start == "'":
# read an utf-8 char an get the token-id
# Example: '+'
if check(fh, "\\"):
# snap_backslashed_character throws an exception if 'backslashed char' is nonsense.
character_code = snap_backslashed_character.do(fh, ReducedSetOfBackslashedCharactersF=True)
else:
character_code = __read_one_utf8_code_from_stream(fh)
if character_code is None:
error_msg("Missing utf8-character for definition of character code by character.", fh)
elif fh.read(1) != '\'':
error_msg("Missing closing ' for definition of character code by character.", fh)
return character_code
if start == "U":
if fh.read(1) != "C": fh.seek(pos); return -1
# read Unicode Name
# Example: UC MATHEMATICAL_MONOSPACE_DIGIT_FIVE
skip_whitespace(fh)
ucs_name = __read_token_identifier(fh)
if ucs_name == "": fh.seek(pos); return -1
# Get the character set related to the given name. Note, the size of the set
# is supposed to be one.
character_code = ucs_property_db.get_character_set("Name", ucs_name)
if type(character_code) in [str, unicode]:
verify_word_in_list(ucs_name, ucs_property_db["Name"].code_point_db,
"The string %s\ndoes not identify a known unicode character." % ucs_name,
fh)
elif type(character_code) not in [int, long]:
error_msg("%s relates to more than one character in unicode database." % ucs_name, fh)
return character_code
fh.seek(pos)
character_code = read_integer(fh)
if character_code is not None: return character_code
# Try to interpret it as something else ...
fh.seek(pos)
return -1
def get_character_code_sequence(sh):
assert sh.__class__.__name__ == "StringIO" \
or sh.__class__.__name__ == "file"
# Only \" is a special character '"', any other backslashed character
# remains as the sequence 'backslash' + character
sequence = []
while 1 + 1 == 2:
char_code = utf8.__read_one_utf8_code_from_stream(sh)
if char_code is None:
raise RegularExpressionException("End of file reached while parsing quoted string.")
elif char_code == ord("\\"):
char_code = snap_backslashed_character.do(sh)
if char_code is None:
raise RegularExpressionException("Unidentified backslash-sequence in quoted string.")
elif char_code == ord('"'):
break
sequence.append(char_code)
return sequence
def read_character_code(fh):
# NOTE: This function is tested with the regeression test for feature request 2251359.
# See directory $QUEX_PATH/TEST/2251359.
pos = fh.tell()
start = fh.read(1)
if start == "":
fh.seek(pos)
return -1
elif start == "'":
# read an utf-8 char an get the token-id
# Example: '+'
if check(fh, "\\"):
# snap_backslashed_character throws an exception if 'backslashed char' is nonsense.
character_code = snap_backslashed_character.do(
fh, ReducedSetOfBackslashedCharactersF=True)
else:
character_code = __read_one_utf8_code_from_stream(fh)
if character_code is None:
error_msg(
"Missing utf8-character for definition of character code by character.",
fh)
elif fh.read(1) != '\'':
error_msg(
"Missing closing ' for definition of character code by character.",
fh)
return character_code
if start == "U":
if fh.read(1) != "C":
fh.seek(pos)
return -1
# read Unicode Name
# Example: UC MATHEMATICAL_MONOSPACE_DIGIT_FIVE
skip_whitespace(fh)
ucs_name = __read_token_identifier(fh)
if ucs_name == "":
fh.seek(pos)
return -1
# Get the character set related to the given name. Note, the size of the set
# is supposed to be one.
character_code = ucs_property_db.get_character_set("Name", ucs_name)
if type(character_code) in [str, unicode]:
verify_word_in_list(
ucs_name, ucs_property_db["Name"].code_point_db,
"The string %s\ndoes not identify a known unicode character." %
ucs_name, fh)
elif type(character_code) not in [int, long]:
error_msg(
"%s relates to more than one character in unicode database." %
ucs_name, fh)
return character_code
fh.seek(pos)
character_code = read_integer(fh)
if character_code is not None: return character_code
# Try to interpret it as something else ...
fh.seek(pos)
return -1
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
