codex
656 lines
19 KiB
Python
656 lines
19 KiB
Python
r"""
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Backrefs re.
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Add the ability to use the following backrefs with re:
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- `\l` - Lowercase character class (search)
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- `\c` - Uppercase character class (search)
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- `\L` - Inverse of lowercase character class (search)
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- `\C` - Inverse of uppercase character class (search)
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- `\Q` and `\Q...\E` - Escape/quote chars (search)
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- `\c` and `\C...\E` - Uppercase char or chars (replace)
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- `\l` and `\L...\E` - Lowercase char or chars (replace)
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- `[:ascii:]` - Posix style classes (search)
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- `[:^ascii:]` - Inverse Posix style classes (search)
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- `\pL`, `\p{Lu}`, \p{Letter}, `\p{gc=Uppercase_Letter}` - Unicode properties (search Unicode)
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- `\PL`, `\P{Lu}`, `\p{^Lu}` - Inverse Unicode properties (search Unicode)
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- `\N{Black Club Suit}` - Unicode character by name (search & replace)
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- `\u0000` and `\U00000000` - Unicode characters (replace)
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- `\m` - Starting word boundary (search)
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- `\M` - Ending word boundary (search)
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- `\R` - Generic line breaks (search)
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- `\X` - Simplified grapheme clusters (search)
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Licensed under MIT
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Copyright (c) 2011 - 2020 Isaac Muse <isaacmuse@gmail.com>
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"""
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from __future__ import annotations
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import re as _re
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import copyreg as _copyreg
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from functools import lru_cache as _lru_cache
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from . import util as _util
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from . import _bre_parse
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from ._bre_parse import ReplaceTemplate
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from typing import AnyStr, Pattern, Match, Callable, Any, Generic, Mapping, Iterator, cast
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__all__ = (
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"expand", "expandf", "search", "match", "fullmatch", "split", "findall", "finditer", "sub", "subf",
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"subn", "subfn", "purge", "escape", "fullmatch", "DEBUG", "I", "IGNORECASE", "L", "LOCALE", "M", "MULTILINE",
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"S", "DOTALL", "U", "UNICODE", "X", "VERBOSE", "compile", "compile_search", "compile_replace", "Bre",
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"ReplaceTemplate", "A", "ASCII"
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)
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# Expose some common re flags and methods to
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# save having to import re and backrefs libraries
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DEBUG = _re.DEBUG
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I = _re.I
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IGNORECASE = _re.IGNORECASE
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L = _re.L
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LOCALE = _re.LOCALE
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M = _re.M
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MULTILINE = _re.MULTILINE
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S = _re.S
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DOTALL = _re.DOTALL
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U = _re.U
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UNICODE = _re.UNICODE
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X = _re.X
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VERBOSE = _re.VERBOSE
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A = _re.A
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ASCII = _re.ASCII
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escape = _re.escape
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# Replace flags
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FORMAT = 1
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# Maximum size of the cache.
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_MAXCACHE = 500
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_RE_TYPE = type(_re.compile('', 0))
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@_lru_cache(maxsize=_MAXCACHE)
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def _cached_search_compile(
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pattern: AnyStr,
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re_verbose: bool,
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re_unicode: bool,
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pattern_type: type[AnyStr]
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) -> AnyStr:
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"""Cached search compile."""
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return _bre_parse._SearchParser(pattern, re_verbose, re_unicode).parse()
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@_lru_cache(maxsize=_MAXCACHE)
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def _cached_replace_compile(
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pattern: Pattern[AnyStr],
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repl: AnyStr,
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flags: int,
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pattern_type: type[AnyStr]
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) -> ReplaceTemplate[AnyStr]:
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"""Cached replace compile."""
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return _bre_parse._ReplaceParser(pattern, repl, bool(flags & FORMAT)).parse()
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def _get_cache_size(replace: bool = False) -> int:
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"""Get size of cache."""
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if not replace:
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size = _cached_search_compile.cache_info().currsize
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else:
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size = _cached_replace_compile.cache_info().currsize
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return size
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def _purge_cache() -> None:
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"""Purge the cache."""
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_cached_replace_compile.cache_clear()
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_cached_search_compile.cache_clear()
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def _is_replace(obj: Any) -> bool:
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"""Check if object is a replace object."""
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return isinstance(obj, ReplaceTemplate)
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def _apply_replace_backrefs(
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m: Match[AnyStr] | None,
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repl: ReplaceTemplate[AnyStr] | AnyStr,
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flags: int = 0
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) -> AnyStr:
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"""Expand with either the `ReplaceTemplate` or compile on the fly, or return None."""
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if m is None:
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raise ValueError("Match is None!")
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if isinstance(repl, ReplaceTemplate):
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return repl.expand(m)
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return _bre_parse._ReplaceParser(m.re, repl, bool(flags & FORMAT)).parse().expand(m)
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def _apply_search_backrefs(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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flags: int = 0
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) -> AnyStr | Pattern[AnyStr]:
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"""Apply the search backrefs to the search pattern."""
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if isinstance(pattern, (str, bytes)):
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re_verbose = bool(VERBOSE & flags)
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re_unicode = None
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if bool((ASCII | LOCALE) & flags):
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re_unicode = False
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elif bool(UNICODE & flags):
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re_unicode = True
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if not (flags & DEBUG):
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p = _cached_search_compile(
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pattern, re_verbose, re_unicode, type(pattern)
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) # type: AnyStr | Pattern[AnyStr]
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else: # pragma: no cover
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p = _bre_parse._SearchParser(pattern, re_verbose, re_unicode).parse()
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elif isinstance(pattern, Bre):
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if flags:
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raise ValueError("Cannot process flags argument with a compiled pattern")
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p = pattern._pattern
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elif isinstance(pattern, _RE_TYPE):
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if flags:
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raise ValueError("Cannot process flags argument with a compiled pattern!")
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p = pattern
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else:
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raise TypeError("Not a string or compiled pattern!")
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return p
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def _assert_expandable(repl: Any, use_format: bool = False) -> None:
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"""Check if replace template is expandable."""
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if isinstance(repl, ReplaceTemplate):
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if repl.use_format != use_format:
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if use_format:
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raise ValueError("Replace not compiled as a format replace")
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else:
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raise ValueError("Replace should not be compiled as a format replace!")
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elif not isinstance(repl, (str, bytes)):
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raise TypeError("Expected string, buffer, or compiled replace!")
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###########################
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# API
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##########################
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class Bre(_util.Immutable, Generic[AnyStr]):
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"""Bre object."""
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_pattern: Pattern[AnyStr]
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auto_compile: bool
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_hash: int
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__slots__ = ("_pattern", "auto_compile", "_hash")
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def __init__(self, pattern: Pattern[AnyStr], auto_compile: bool = True) -> None:
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"""Initialization."""
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super().__init__(
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_pattern=pattern,
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auto_compile=auto_compile,
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_hash=hash((type(self), type(pattern), pattern, auto_compile))
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)
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@property
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def pattern(self) -> AnyStr:
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"""Return pattern."""
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return self._pattern.pattern
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@property
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def flags(self) -> int:
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"""Return flags."""
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return self._pattern.flags
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@property
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def groupindex(self) -> Mapping[str, int]:
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"""Return group index."""
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return self._pattern.groupindex
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@property
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def groups(self) -> tuple[AnyStr | None, ...]:
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"""Return groups."""
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return cast('tuple[AnyStr | None, ...]', self._pattern.groups)
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@property
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def scanner(self) -> Any:
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"""Return scanner."""
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return self._pattern.scanner # type: ignore[attr-defined]
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def __hash__(self) -> int:
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"""Hash."""
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return self._hash
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def __eq__(self, other: Any) -> bool:
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"""Equal."""
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return (
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isinstance(other, Bre) and
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self._pattern == other._pattern and
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self.auto_compile == other.auto_compile
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)
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def __ne__(self, other: Any) -> bool:
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"""Equal."""
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return (
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not isinstance(other, Bre) or
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self._pattern != other._pattern or
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self.auto_compile != other.auto_compile
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)
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def __repr__(self) -> str: # pragma: no cover
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"""Representation."""
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return '{}.{}({!r}, auto_compile={!r})'.format(
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self.__module__, self.__class__.__name__, self._pattern, self.auto_compile
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)
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def _auto_compile(
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self,
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template: AnyStr | Callable[..., AnyStr],
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use_format: bool = False
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) -> AnyStr | Callable[..., AnyStr]:
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"""Compile replacements."""
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if isinstance(template, ReplaceTemplate):
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if use_format != template.use_format:
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raise ValueError("Compiled replace cannot be a format object!")
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elif isinstance(template, ReplaceTemplate) or (isinstance(template, (str, bytes)) and self.auto_compile):
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return self.compile(template, (FORMAT if use_format and not isinstance(template, ReplaceTemplate) else 0))
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elif isinstance(template, (str, bytes)) and use_format:
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# Reject an attempt to run format replace when auto-compiling
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# of template strings has been disabled and we are using a
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# template string.
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raise AttributeError('Format replaces cannot be called without compiling replace template!')
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return template
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def compile( # noqa A001
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self,
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repl: AnyStr | Callable[..., AnyStr],
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flags: int = 0
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) -> Callable[..., AnyStr]:
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"""Compile replace."""
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return compile_replace(self._pattern, repl, flags)
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def search(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `search`."""
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return self._pattern.search(string, *args, **kwargs)
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def match(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `match`."""
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return self._pattern.match(string, *args, **kwargs)
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def fullmatch(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `fullmatch`."""
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return self._pattern.fullmatch(string, *args, **kwargs)
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def split(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> list[AnyStr]:
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"""Apply `split`."""
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return self._pattern.split(string, *args, **kwargs)
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def findall(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> list[AnyStr] | list[tuple[AnyStr, ...]]:
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"""Apply `findall`."""
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return self._pattern.findall(string, *args, **kwargs)
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def finditer(
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self,
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> Iterator[Match[AnyStr]]:
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"""Apply `finditer`."""
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return self._pattern.finditer(string, *args, **kwargs)
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def sub(
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self,
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repl: AnyStr | Callable[..., AnyStr],
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> AnyStr:
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"""Apply `sub`."""
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return self._pattern.sub(self._auto_compile(repl), string, *args, **kwargs)
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def subf( # noqa A002
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self,
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repl: AnyStr | Callable[..., AnyStr],
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> AnyStr:
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"""Apply `sub` with format style replace."""
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return self._pattern.sub(self._auto_compile(repl, True), string, *args, **kwargs)
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def subn(
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self,
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repl: AnyStr | Callable[..., AnyStr],
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> tuple[AnyStr, int]:
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"""Apply `subn` with format style replace."""
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return self._pattern.subn(self._auto_compile(repl), string, *args, **kwargs)
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def subfn( # noqa A002
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self,
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repl: AnyStr | Callable[..., AnyStr],
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string: AnyStr,
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*args: Any,
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**kwargs: Any
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) -> tuple[AnyStr, int]:
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"""Apply `subn` after applying backrefs."""
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return self._pattern.subn(self._auto_compile(repl, True), string, *args, **kwargs)
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def compile( # noqa A001
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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flags: int = 0,
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auto_compile: bool | None = None
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) -> Bre[AnyStr]:
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"""Compile both the search or search and replace into one object."""
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if isinstance(pattern, Bre):
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if auto_compile is not None:
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raise ValueError("Cannot compile Bre with a different auto_compile!")
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elif flags != 0:
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raise ValueError("Cannot process flags argument with a compiled pattern")
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return pattern
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else:
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if auto_compile is None:
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auto_compile = True
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return Bre(compile_search(pattern, flags), auto_compile)
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def compile_search(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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flags: int = 0
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) -> Pattern[AnyStr]:
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"""Compile with extended search references."""
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return _re.compile(_apply_search_backrefs(pattern, flags), flags)
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def compile_replace(
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pattern: Pattern[AnyStr],
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repl: AnyStr | Callable[..., AnyStr],
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flags: int = 0
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) -> Callable[..., AnyStr]:
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"""Construct a method that can be used as a replace method for `sub`, `subn`, etc."""
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if pattern is not None and isinstance(pattern, _RE_TYPE):
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if isinstance(repl, (str, bytes)):
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if not (pattern.flags & DEBUG):
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call = _cached_replace_compile(pattern, repl, flags, type(repl))
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else: # pragma: no cover
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call = _bre_parse._ReplaceParser(pattern, repl, bool(flags & FORMAT)).parse()
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elif isinstance(repl, ReplaceTemplate):
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if flags:
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raise ValueError("Cannot process flags argument with a ReplaceTemplate!")
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if repl.pattern_hash != hash(pattern):
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raise ValueError("Pattern hash doesn't match hash in compiled replace!")
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call = repl
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else:
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raise TypeError("Not a valid type!")
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else:
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raise TypeError("Pattern must be a compiled regular expression!")
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return call
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def purge() -> None:
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"""Purge caches."""
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_purge_cache()
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_re.purge()
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def expand(m: Match[AnyStr] | None, repl: ReplaceTemplate[AnyStr] | AnyStr) -> AnyStr:
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"""Expand the string using the replace pattern or function."""
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_assert_expandable(repl)
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return _apply_replace_backrefs(m, repl)
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def expandf(m: Match[AnyStr] | None, repl: ReplaceTemplate[AnyStr] | AnyStr) -> AnyStr:
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"""Expand the string using the format replace pattern or function."""
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_assert_expandable(repl, True)
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return _apply_replace_backrefs(m, repl, flags=FORMAT)
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def search(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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flags: int | _re.RegexFlag = 0,
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*args: Any,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `search` after applying backrefs."""
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return _re.search(_apply_search_backrefs(pattern, flags), string, flags, *args, **kwargs)
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|
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def prefixmatch(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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flags: int | _re.RegexFlag = 0,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `match` after applying backrefs."""
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return _re.match(_apply_search_backrefs(pattern, flags), string, flags=flags, **kwargs)
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match = prefixmatch
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|
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def fullmatch(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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flags: int | _re.RegexFlag = 0,
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**kwargs: Any
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) -> Match[AnyStr] | None:
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"""Apply `fullmatch` after applying backrefs."""
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return _re.fullmatch(_apply_search_backrefs(pattern, flags), string, flags=flags, **kwargs)
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|
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def split(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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maxsplit: int = 0,
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flags: int | _re.RegexFlag = 0,
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**kwargs: Any
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) -> list[AnyStr]:
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"""Apply `split` after applying backrefs."""
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return _re.split(
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_apply_search_backrefs(pattern, flags),
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string,
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maxsplit=maxsplit,
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flags=flags,
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**kwargs
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)
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def findall(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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flags: int | _re.RegexFlag = 0,
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**kwargs: Any
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) -> list[AnyStr] | list[tuple[AnyStr, ...]]:
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"""Apply `findall` after applying backrefs."""
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return _re.findall(_apply_search_backrefs(pattern, flags), string, flags=flags, **kwargs)
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|
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def finditer(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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string: AnyStr,
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flags: int | _re.RegexFlag = 0,
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**kwargs: Any
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) -> Iterator[Match[AnyStr]]:
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"""Apply `finditer` after applying backrefs."""
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return _re.finditer(_apply_search_backrefs(pattern, flags), string, flags=flags, **kwargs)
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|
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def sub(
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pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
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repl: AnyStr | Callable[..., AnyStr],
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string: AnyStr,
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count: int = 0,
|
|
flags: int | _re.RegexFlag = 0,
|
|
**kwargs: Any
|
|
) -> AnyStr:
|
|
"""Apply `sub` after applying backrefs."""
|
|
|
|
is_replace = _is_replace(repl)
|
|
is_string = isinstance(repl, (str, bytes))
|
|
if is_replace and cast(ReplaceTemplate[AnyStr], repl).use_format:
|
|
raise ValueError("Compiled replace cannot be a format object!")
|
|
|
|
pattern = compile_search(pattern, flags)
|
|
return _re.sub(
|
|
pattern,
|
|
(compile_replace(pattern, repl) if is_replace or is_string else repl),
|
|
string,
|
|
count=count,
|
|
flags=0,
|
|
**kwargs
|
|
)
|
|
|
|
|
|
def subf(
|
|
pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
|
|
repl: AnyStr | Callable[..., AnyStr],
|
|
string: AnyStr,
|
|
count: int = 0,
|
|
flags: int | _re.RegexFlag = 0,
|
|
**kwargs: Any
|
|
) -> AnyStr:
|
|
"""Apply `sub` with format style replace."""
|
|
|
|
is_replace = _is_replace(repl)
|
|
is_string = isinstance(repl, (str, bytes))
|
|
if is_replace and not cast(ReplaceTemplate[AnyStr], repl).use_format:
|
|
raise ValueError("Compiled replace is not a format object!")
|
|
|
|
pattern = compile_search(pattern, flags)
|
|
rflags = FORMAT if is_string else 0
|
|
return _re.sub(
|
|
pattern,
|
|
(compile_replace(pattern, repl, flags=rflags) if is_replace or is_string else repl),
|
|
string,
|
|
count=count,
|
|
flags=0,
|
|
**kwargs
|
|
)
|
|
|
|
|
|
def subn(
|
|
pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
|
|
repl: AnyStr | Callable[..., AnyStr],
|
|
string: AnyStr,
|
|
count: int = 0,
|
|
flags: int | _re.RegexFlag = 0,
|
|
**kwargs: Any
|
|
) -> tuple[AnyStr, int]:
|
|
"""Apply `subn` with format style replace."""
|
|
|
|
is_replace = _is_replace(repl)
|
|
is_string = isinstance(repl, (str, bytes))
|
|
if is_replace and cast(ReplaceTemplate[AnyStr], repl).use_format:
|
|
raise ValueError("Compiled replace cannot be a format object!")
|
|
|
|
pattern = compile_search(pattern, flags)
|
|
return _re.subn(
|
|
pattern,
|
|
(compile_replace(pattern, repl) if is_replace or is_string else repl),
|
|
string,
|
|
count=count,
|
|
flags=0,
|
|
**kwargs
|
|
)
|
|
|
|
|
|
def subfn(
|
|
pattern: AnyStr | Pattern[AnyStr] | Bre[AnyStr],
|
|
repl: AnyStr | Callable[..., AnyStr],
|
|
string: AnyStr,
|
|
count: int = 0,
|
|
flags: int | _re.RegexFlag = 0,
|
|
**kwargs: Any
|
|
) -> tuple[AnyStr, int]:
|
|
"""Apply `subn` after applying backrefs."""
|
|
|
|
is_replace = _is_replace(repl)
|
|
is_string = isinstance(repl, (str, bytes))
|
|
if is_replace and not cast(ReplaceTemplate[AnyStr], repl).use_format:
|
|
raise ValueError("Compiled replace is not a format object!")
|
|
|
|
pattern = compile_search(pattern, flags)
|
|
rflags = FORMAT if is_string else 0
|
|
return _re.subn(
|
|
pattern,
|
|
(compile_replace(pattern, repl, flags=rflags) if is_replace or is_string else repl),
|
|
string,
|
|
count=count,
|
|
flags=0,
|
|
**kwargs
|
|
)
|
|
|
|
|
|
def _pickle(p): # type: ignore[no-untyped-def]
|
|
return Bre, (p._pattern, p.auto_compile)
|
|
|
|
|
|
_copyreg.pickle(Bre, _pickle)
|