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string.py10.3 KB · 281 lines
"""A collection of string constants. Public module variables: whitespace -- a string containing all ASCII whitespaceascii_lowercase -- a string containing all ASCII lowercase lettersascii_uppercase -- a string containing all ASCII uppercase lettersascii_letters -- a string containing all ASCII lettersdigits -- a string containing all ASCII decimal digitshexdigits -- a string containing all ASCII hexadecimal digitsoctdigits -- a string containing all ASCII octal digitspunctuation -- a string containing all ASCII punctuation charactersprintable -- a string containing all ASCII characters considered printable """ __all__ = ["ascii_letters", "ascii_lowercase", "ascii_uppercase", "capwords",           "digits", "hexdigits", "octdigits", "printable", "punctuation",           "whitespace", "Formatter", "Template"] import _string # Some strings for ctype-style character classificationwhitespace = ' \t\n\r\v\f'ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz'ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'ascii_letters = ascii_lowercase + ascii_uppercasedigits = '0123456789'hexdigits = digits + 'abcdef' + 'ABCDEF'octdigits = '01234567'punctuation = r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""printable = digits + ascii_letters + punctuation + whitespace # Functions which aren't available as string methods. # Capitalize the words in a string, e.g. " aBc  dEf " -> "Abc Def".def capwords(s, sep=None):    """capwords(s [,sep]) -> string     Split the argument into words using split, capitalize each    word using capitalize, and join the capitalized words using    join.  If the optional second argument sep is absent or None,    runs of whitespace characters are replaced by a single space    and leading and trailing whitespace are removed, otherwise    sep is used to split and join the words.     """    return (sep or ' ').join(x.capitalize() for x in s.split(sep))  ####################################################################import re as _refrom collections import ChainMap as _ChainMap _sentinel_dict = {} class Template:    """A string class for supporting $-substitutions."""     delimiter = '$'    # r'[a-z]' matches to non-ASCII letters when used with IGNORECASE, but    # without the ASCII flag.  We can't add re.ASCII to flags because of    # backward compatibility.  So we use the ?a local flag and [a-z] pattern.    # See https://bugs.python.org/issue31672    idpattern = r'(?a:[_a-z][_a-z0-9]*)'    braceidpattern = None    flags = _re.IGNORECASE     def __init_subclass__(cls):        super().__init_subclass__()        if 'pattern' in cls.__dict__:            pattern = cls.pattern        else:            delim = _re.escape(cls.delimiter)            id = cls.idpattern            bid = cls.braceidpattern or cls.idpattern            pattern = fr"""            {delim}(?:              (?P<escaped>{delim})  |   # Escape sequence of two delimiters              (?P<named>{id})       |   # delimiter and a Python identifier              {{(?P<braced>{bid})}} |   # delimiter and a braced identifier              (?P<invalid>)             # Other ill-formed delimiter exprs            )            """        cls.pattern = _re.compile(pattern, cls.flags | _re.VERBOSE)     def __init__(self, template):        self.template = template     # Search for $$, $identifier, ${identifier}, and any bare $'s     def _invalid(self, mo):        i = mo.start('invalid')        lines = self.template[:i].splitlines(keepends=True)        if not lines:            colno = 1            lineno = 1        else:            colno = i - len(''.join(lines[:-1]))            lineno = len(lines)        raise ValueError('Invalid placeholder in string: line %d, col %d' %                         (lineno, colno))     def substitute(self, mapping=_sentinel_dict, /, **kws):        if mapping is _sentinel_dict:            mapping = kws        elif kws:            mapping = _ChainMap(kws, mapping)        # Helper function for .sub()        def convert(mo):            # Check the most common path first.            named = mo.group('named') or mo.group('braced')            if named is not None:                return str(mapping[named])            if mo.group('escaped') is not None:                return self.delimiter            if mo.group('invalid') is not None:                self._invalid(mo)            raise ValueError('Unrecognized named group in pattern',                             self.pattern)        return self.pattern.sub(convert, self.template)     def safe_substitute(self, mapping=_sentinel_dict, /, **kws):        if mapping is _sentinel_dict:            mapping = kws        elif kws:            mapping = _ChainMap(kws, mapping)        # Helper function for .sub()        def convert(mo):            named = mo.group('named') or mo.group('braced')            if named is not None:                try:                    return str(mapping[named])                except KeyError:                    return mo.group()            if mo.group('escaped') is not None:                return self.delimiter            if mo.group('invalid') is not None:                return mo.group()            raise ValueError('Unrecognized named group in pattern',                             self.pattern)        return self.pattern.sub(convert, self.template) # Initialize Template.pattern.  __init_subclass__() is automatically called# only for subclasses, not for the Template class itself.Template.__init_subclass__()  ######################################################################### the Formatter class# see PEP 3101 for details and purpose of this class # The hard parts are reused from the C implementation.  They're exposed as "_"# prefixed methods of str. # The overall parser is implemented in _string.formatter_parser.# The field name parser is implemented in _string.formatter_field_name_split class Formatter:    def format(self, format_string, /, *args, **kwargs):        return self.vformat(format_string, args, kwargs)     def vformat(self, format_string, args, kwargs):        used_args = set()        result, _ = self._vformat(format_string, args, kwargs, used_args, 2)        self.check_unused_args(used_args, args, kwargs)        return result     def _vformat(self, format_string, args, kwargs, used_args, recursion_depth,                 auto_arg_index=0):        if recursion_depth < 0:            raise ValueError('Max string recursion exceeded')        result = []        for literal_text, field_name, format_spec, conversion in \                self.parse(format_string):             # output the literal text            if literal_text:                result.append(literal_text)             # if there's a field, output it            if field_name is not None:                # this is some markup, find the object and do                #  the formatting                 # handle arg indexing when empty field_names are given.                if field_name == '':                    if auto_arg_index is False:                        raise ValueError('cannot switch from manual field '                                         'specification to automatic field '                                         'numbering')                    field_name = str(auto_arg_index)                    auto_arg_index += 1                elif field_name.isdigit():                    if auto_arg_index:                        raise ValueError('cannot switch from manual field '                                         'specification to automatic field '                                         'numbering')                    # disable auto arg incrementing, if it gets                    # used later on, then an exception will be raised                    auto_arg_index = False                 # given the field_name, find the object it references                #  and the argument it came from                obj, arg_used = self.get_field(field_name, args, kwargs)                used_args.add(arg_used)                 # do any conversion on the resulting object                obj = self.convert_field(obj, conversion)                 # expand the format spec, if needed                format_spec, auto_arg_index = self._vformat(                    format_spec, args, kwargs,                    used_args, recursion_depth-1,                    auto_arg_index=auto_arg_index)                 # format the object and append to the result                result.append(self.format_field(obj, format_spec))         return ''.join(result), auto_arg_index      def get_value(self, key, args, kwargs):        if isinstance(key, int):            return args[key]        else:            return kwargs[key]      def check_unused_args(self, used_args, args, kwargs):        pass      def format_field(self, value, format_spec):        return format(value, format_spec)      def convert_field(self, value, conversion):        # do any conversion on the resulting object        if conversion is None:            return value        elif conversion == 's':            return str(value)        elif conversion == 'r':            return repr(value)        elif conversion == 'a':            return ascii(value)        raise ValueError("Unknown conversion specifier {0!s}".format(conversion))      # returns an iterable that contains tuples of the form:    # (literal_text, field_name, format_spec, conversion)    # literal_text can be zero length    # field_name can be None, in which case there's no    #  object to format and output    # if field_name is not None, it is looked up, formatted    #  with format_spec and conversion and then used    def parse(self, format_string):        return _string.formatter_parser(format_string)      # given a field_name, find the object it references.    #  field_name:   the field being looked up, e.g. "0.name"    #                 or "lookup[3]"    #  used_args:    a set of which args have been used    #  args, kwargs: as passed in to vformat    def get_field(self, field_name, args, kwargs):        first, rest = _string.formatter_field_name_split(field_name)         obj = self.get_value(first, args, kwargs)         # loop through the rest of the field_name, doing        #  getattr or getitem as needed        for is_attr, i in rest:            if is_attr:                obj = getattr(obj, i)            else:                obj = obj[i]         return obj, first