use tclint as parser / formatter

server/libs/pathspec/pattern.py

@@ -0,0 +1,206 @@
+"""
+This module provides the base definition for patterns.
+"""
+
+import dataclasses
+import re
+import warnings
+from typing import (
+	Any,
+	AnyStr,
+	Iterable,
+	Iterator,
+	Match as MatchHint,
+	Optional,
+	Pattern as PatternHint,
+	Tuple,
+	Union)
+
+
+class Pattern(object):
+	"""
+	The :class:`Pattern` class is the abstract definition of a pattern.
+	"""
+
+	# Make the class dict-less.
+	__slots__ = ('include',)
+
+	def __init__(self, include: Optional[bool]) -> None:
+		"""
+		Initializes the :class:`Pattern` instance.
+
+		*include* (:class:`bool` or :data:`None`) is whether the matched
+		files should be included (:data:`True`), excluded (:data:`False`),
+		or is a null-operation (:data:`None`).
+		"""
+
+		self.include = include
+		"""
+		*include* (:class:`bool` or :data:`None`) is whether the matched
+		files should be included (:data:`True`), excluded (:data:`False`),
+		or is a null-operation (:data:`None`).
+		"""
+
+	def match(self, files: Iterable[str]) -> Iterator[str]:
+		"""
+		DEPRECATED: This method is no longer used and has been replaced by
+		:meth:`.match_file`. Use the :meth:`.match_file` method with a loop
+		for similar results.
+
+		Matches this pattern against the specified files.
+
+		*files* (:class:`~collections.abc.Iterable` of :class:`str`)
+		contains each file relative to the root directory (e.g.,
+		:data:`"relative/path/to/file"`).
+
+		Returns an :class:`~collections.abc.Iterable` yielding each matched
+		file path (:class:`str`).
+		"""
+		warnings.warn((
+			"{0.__module__}.{0.__qualname__}.match() is deprecated. Use "
+			"{0.__module__}.{0.__qualname__}.match_file() with a loop for "
+			"similar results."
+		).format(self.__class__), DeprecationWarning, stacklevel=2)
+
+		for file in files:
+			if self.match_file(file) is not None:
+				yield file
+
+	def match_file(self, file: str) -> Optional[Any]:
+		"""
+		Matches this pattern against the specified file.
+
+		*file* (:class:`str`) is the normalized file path to match against.
+
+		Returns the match result if *file* matched; otherwise, :data:`None`.
+		"""
+		raise NotImplementedError((
+			"{0.__module__}.{0.__qualname__} must override match_file()."
+		).format(self.__class__))
+
+
+class RegexPattern(Pattern):
+	"""
+	The :class:`RegexPattern` class is an implementation of a pattern
+	using regular expressions.
+	"""
+
+	# Keep the class dict-less.
+	__slots__ = ('regex',)
+
+	def __init__(
+		self,
+		pattern: Union[AnyStr, PatternHint],
+		include: Optional[bool] = None,
+	) -> None:
+		"""
+		Initializes the :class:`RegexPattern` instance.
+
+		*pattern* (:class:`str`, :class:`bytes`, :class:`re.Pattern`, or
+		:data:`None`) is the pattern to compile into a regular expression.
+
+		*include* (:class:`bool` or :data:`None`) must be :data:`None`
+		unless *pattern* is a precompiled regular expression (:class:`re.Pattern`)
+		in which case it is whether matched files should be included
+		(:data:`True`), excluded (:data:`False`), or is a null operation
+		(:data:`None`).
+
+			.. NOTE:: Subclasses do not need to support the *include*
+			   parameter.
+		"""
+
+		if isinstance(pattern, (str, bytes)):
+			assert include is None, (
+				"include:{!r} must be null when pattern:{!r} is a string."
+			).format(include, pattern)
+			regex, include = self.pattern_to_regex(pattern)
+			# NOTE: Make sure to allow a null regular expression to be
+			# returned for a null-operation.
+			if include is not None:
+				regex = re.compile(regex)
+
+		elif pattern is not None and hasattr(pattern, 'match'):
+			# Assume pattern is a precompiled regular expression.
+			# - NOTE: Used specified *include*.
+			regex = pattern
+
+		elif pattern is None:
+			# NOTE: Make sure to allow a null pattern to be passed for a
+			# null-operation.
+			assert include is None, (
+				"include:{!r} must be null when pattern:{!r} is null."
+			).format(include, pattern)
+
+		else:
+			raise TypeError("pattern:{!r} is not a string, re.Pattern, or None.".format(pattern))
+
+		super(RegexPattern, self).__init__(include)
+
+		self.regex: PatternHint = regex
+		"""
+		*regex* (:class:`re.Pattern`) is the regular expression for the
+		pattern.
+		"""
+
+	def __eq__(self, other: 'RegexPattern') -> bool:
+		"""
+		Tests the equality of this regex pattern with *other* (:class:`RegexPattern`)
+		by comparing their :attr:`~Pattern.include` and :attr:`~RegexPattern.regex`
+		attributes.
+		"""
+		if isinstance(other, RegexPattern):
+			return self.include == other.include and self.regex == other.regex
+		else:
+			return NotImplemented
+
+	def match_file(self, file: str) -> Optional['RegexMatchResult']:
+		"""
+		Matches this pattern against the specified file.
+
+		*file* (:class:`str`)
+		contains each file relative to the root directory (e.g., "relative/path/to/file").
+
+		Returns the match result (:class:`RegexMatchResult`) if *file*
+		matched; otherwise, :data:`None`.
+		"""
+		if self.include is not None:
+			match = self.regex.match(file)
+			if match is not None:
+				return RegexMatchResult(match)
+
+		return None
+
+	@classmethod
+	def pattern_to_regex(cls, pattern: str) -> Tuple[str, bool]:
+		"""
+		Convert the pattern into an uncompiled regular expression.
+
+		*pattern* (:class:`str`) is the pattern to convert into a regular
+		expression.
+
+		Returns the uncompiled regular expression (:class:`str` or :data:`None`),
+		and whether matched files should be included (:data:`True`),
+		excluded (:data:`False`), or is a null-operation (:data:`None`).
+
+			.. NOTE:: The default implementation simply returns *pattern* and
+			   :data:`True`.
+		"""
+		return pattern, True
+
+
+@dataclasses.dataclass()
+class RegexMatchResult(object):
+	"""
+	The :class:`RegexMatchResult` data class is used to return information
+	about the matched regular expression.
+	"""
+
+	# Keep the class dict-less.
+	__slots__ = (
+		'match',
+	)
+
+	match: MatchHint
+	"""
+	*match* (:class:`re.Match`) is the regex match result.
+	"""