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285 lines
8.5 KiB
285 lines
8.5 KiB
# util.py
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import inspect
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import warnings
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import types
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import collections
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import itertools
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from functools import lru_cache, wraps
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from typing import Callable, List, Union, Iterable, TypeVar, cast
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_bslash = chr(92)
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C = TypeVar("C", bound=Callable)
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class __config_flags:
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"""Internal class for defining compatibility and debugging flags"""
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_all_names: List[str] = []
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_fixed_names: List[str] = []
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_type_desc = "configuration"
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@classmethod
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def _set(cls, dname, value):
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if dname in cls._fixed_names:
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warnings.warn(
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f"{cls.__name__}.{dname} {cls._type_desc} is {str(getattr(cls, dname)).upper()}"
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f" and cannot be overridden",
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stacklevel=3,
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)
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return
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if dname in cls._all_names:
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setattr(cls, dname, value)
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else:
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raise ValueError(f"no such {cls._type_desc} {dname!r}")
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enable = classmethod(lambda cls, name: cls._set(name, True))
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disable = classmethod(lambda cls, name: cls._set(name, False))
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@lru_cache(maxsize=128)
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def col(loc: int, strg: str) -> int:
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"""
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Returns current column within a string, counting newlines as line separators.
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The first column is number 1.
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Note: the default parsing behavior is to expand tabs in the input string
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before starting the parsing process. See
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:class:`ParserElement.parse_string` for more
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information on parsing strings containing ``<TAB>`` s, and suggested
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methods to maintain a consistent view of the parsed string, the parse
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location, and line and column positions within the parsed string.
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"""
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s = strg
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return 1 if 0 < loc < len(s) and s[loc - 1] == "\n" else loc - s.rfind("\n", 0, loc)
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@lru_cache(maxsize=128)
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def lineno(loc: int, strg: str) -> int:
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"""Returns current line number within a string, counting newlines as line separators.
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The first line is number 1.
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Note - the default parsing behavior is to expand tabs in the input string
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before starting the parsing process. See :class:`ParserElement.parse_string`
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for more information on parsing strings containing ``<TAB>`` s, and
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suggested methods to maintain a consistent view of the parsed string, the
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parse location, and line and column positions within the parsed string.
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"""
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return strg.count("\n", 0, loc) + 1
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@lru_cache(maxsize=128)
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def line(loc: int, strg: str) -> str:
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"""
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Returns the line of text containing loc within a string, counting newlines as line separators.
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"""
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last_cr = strg.rfind("\n", 0, loc)
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next_cr = strg.find("\n", loc)
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return strg[last_cr + 1 : next_cr] if next_cr >= 0 else strg[last_cr + 1 :]
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class _UnboundedCache:
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def __init__(self):
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cache = {}
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cache_get = cache.get
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self.not_in_cache = not_in_cache = object()
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def get(_, key):
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return cache_get(key, not_in_cache)
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def set_(_, key, value):
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cache[key] = value
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def clear(_):
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cache.clear()
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self.size = None
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self.get = types.MethodType(get, self)
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self.set = types.MethodType(set_, self)
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self.clear = types.MethodType(clear, self)
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class _FifoCache:
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def __init__(self, size):
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self.not_in_cache = not_in_cache = object()
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cache = {}
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keyring = [object()] * size
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cache_get = cache.get
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cache_pop = cache.pop
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keyiter = itertools.cycle(range(size))
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def get(_, key):
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return cache_get(key, not_in_cache)
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def set_(_, key, value):
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cache[key] = value
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i = next(keyiter)
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cache_pop(keyring[i], None)
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keyring[i] = key
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def clear(_):
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cache.clear()
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keyring[:] = [object()] * size
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self.size = size
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self.get = types.MethodType(get, self)
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self.set = types.MethodType(set_, self)
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self.clear = types.MethodType(clear, self)
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class LRUMemo:
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"""
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A memoizing mapping that retains `capacity` deleted items
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The memo tracks retained items by their access order; once `capacity` items
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are retained, the least recently used item is discarded.
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"""
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def __init__(self, capacity):
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self._capacity = capacity
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self._active = {}
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self._memory = collections.OrderedDict()
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def __getitem__(self, key):
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try:
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return self._active[key]
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except KeyError:
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self._memory.move_to_end(key)
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return self._memory[key]
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def __setitem__(self, key, value):
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self._memory.pop(key, None)
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self._active[key] = value
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def __delitem__(self, key):
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try:
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value = self._active.pop(key)
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except KeyError:
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pass
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else:
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while len(self._memory) >= self._capacity:
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self._memory.popitem(last=False)
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self._memory[key] = value
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def clear(self):
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self._active.clear()
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self._memory.clear()
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class UnboundedMemo(dict):
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"""
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A memoizing mapping that retains all deleted items
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"""
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def __delitem__(self, key):
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pass
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def _escape_regex_range_chars(s: str) -> str:
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# escape these chars: ^-[]
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for c in r"\^-[]":
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s = s.replace(c, _bslash + c)
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s = s.replace("\n", r"\n")
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s = s.replace("\t", r"\t")
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return str(s)
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def _collapse_string_to_ranges(
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s: Union[str, Iterable[str]], re_escape: bool = True
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) -> str:
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def is_consecutive(c):
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c_int = ord(c)
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is_consecutive.prev, prev = c_int, is_consecutive.prev
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if c_int - prev > 1:
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is_consecutive.value = next(is_consecutive.counter)
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return is_consecutive.value
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is_consecutive.prev = 0 # type: ignore [attr-defined]
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is_consecutive.counter = itertools.count() # type: ignore [attr-defined]
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is_consecutive.value = -1 # type: ignore [attr-defined]
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def escape_re_range_char(c):
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return "\\" + c if c in r"\^-][" else c
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def no_escape_re_range_char(c):
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return c
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if not re_escape:
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escape_re_range_char = no_escape_re_range_char
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ret = []
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s = "".join(sorted(set(s)))
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if len(s) > 3:
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for _, chars in itertools.groupby(s, key=is_consecutive):
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first = last = next(chars)
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last = collections.deque(
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itertools.chain(iter([last]), chars), maxlen=1
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).pop()
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if first == last:
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ret.append(escape_re_range_char(first))
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else:
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sep = "" if ord(last) == ord(first) + 1 else "-"
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ret.append(
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f"{escape_re_range_char(first)}{sep}{escape_re_range_char(last)}"
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)
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else:
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ret = [escape_re_range_char(c) for c in s]
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return "".join(ret)
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def _flatten(ll: list) -> list:
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ret = []
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for i in ll:
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if isinstance(i, list):
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ret.extend(_flatten(i))
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else:
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ret.append(i)
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return ret
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def _make_synonym_function(compat_name: str, fn: C) -> C:
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# In a future version, uncomment the code in the internal _inner() functions
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# to begin emitting DeprecationWarnings.
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# Unwrap staticmethod/classmethod
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fn = getattr(fn, "__func__", fn)
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# (Presence of 'self' arg in signature is used by explain_exception() methods, so we take
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# some extra steps to add it if present in decorated function.)
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if "self" == list(inspect.signature(fn).parameters)[0]:
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@wraps(fn)
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def _inner(self, *args, **kwargs):
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# warnings.warn(
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# f"Deprecated - use {fn.__name__}", DeprecationWarning, stacklevel=3
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# )
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return fn(self, *args, **kwargs)
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else:
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@wraps(fn)
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def _inner(*args, **kwargs):
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# warnings.warn(
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# f"Deprecated - use {fn.__name__}", DeprecationWarning, stacklevel=3
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# )
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return fn(*args, **kwargs)
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_inner.__doc__ = f"""Deprecated - use :class:`{fn.__name__}`"""
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_inner.__name__ = compat_name
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_inner.__annotations__ = fn.__annotations__
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if isinstance(fn, types.FunctionType):
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_inner.__kwdefaults__ = fn.__kwdefaults__
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elif isinstance(fn, type) and hasattr(fn, "__init__"):
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_inner.__kwdefaults__ = fn.__init__.__kwdefaults__
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else:
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_inner.__kwdefaults__ = None
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_inner.__qualname__ = fn.__qualname__
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return cast(C, _inner)
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def replaced_by_pep8(fn: C) -> Callable[[Callable], C]:
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"""
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Decorator for pre-PEP8 compatibility synonyms, to link them to the new function.
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"""
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return lambda other: _make_synonym_function(other.__name__, fn)
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