117 lines
3.3 KiB
Python
117 lines
3.3 KiB
Python
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"""Utility."""
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from functools import wraps, lru_cache
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import warnings
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import re
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from typing import Callable, Any, Optional, Tuple, List
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DEBUG = 0x00001
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RE_PATTERN_LINE_SPLIT = re.compile(r'(?:\r\n|(?!\r\n)[\n\r])|$')
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UC_A = ord('A')
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UC_Z = ord('Z')
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@lru_cache(maxsize=512)
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def lower(string: str) -> str:
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"""Lower."""
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new_string = []
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for c in string:
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o = ord(c)
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new_string.append(chr(o + 32) if UC_A <= o <= UC_Z else c)
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return ''.join(new_string)
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class SelectorSyntaxError(Exception):
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"""Syntax error in a CSS selector."""
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def __init__(self, msg: str, pattern: Optional[str] = None, index: Optional[int] = None) -> None:
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"""Initialize."""
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self.line = None
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self.col = None
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self.context = None
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if pattern is not None and index is not None:
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# Format pattern to show line and column position
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self.context, self.line, self.col = get_pattern_context(pattern, index)
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msg = '{}\n line {}:\n{}'.format(msg, self.line, self.context)
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super().__init__(msg)
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def deprecated(message: str, stacklevel: int = 2) -> Callable[..., Any]: # pragma: no cover
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"""
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Raise a `DeprecationWarning` when wrapped function/method is called.
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Usage:
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@deprecated("This method will be removed in version X; use Y instead.")
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def some_method()"
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pass
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"""
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def _wrapper(func: Callable[..., Any]) -> Callable[..., Any]:
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@wraps(func)
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def _deprecated_func(*args: Any, **kwargs: Any) -> Any:
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warnings.warn(
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f"'{func.__name__}' is deprecated. {message}",
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category=DeprecationWarning,
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stacklevel=stacklevel
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)
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return func(*args, **kwargs)
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return _deprecated_func
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return _wrapper
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def warn_deprecated(message: str, stacklevel: int = 2) -> None: # pragma: no cover
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"""Warn deprecated."""
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warnings.warn(
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message,
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category=DeprecationWarning,
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stacklevel=stacklevel
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)
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def get_pattern_context(pattern: str, index: int) -> Tuple[str, int, int]:
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"""Get the pattern context."""
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last = 0
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current_line = 1
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col = 1
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text = [] # type: List[str]
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line = 1
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offset = None # type: Optional[int]
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# Split pattern by newline and handle the text before the newline
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for m in RE_PATTERN_LINE_SPLIT.finditer(pattern):
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linetext = pattern[last:m.start(0)]
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if not len(m.group(0)) and not len(text):
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indent = ''
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offset = -1
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col = index - last + 1
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elif last <= index < m.end(0):
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indent = '--> '
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offset = (-1 if index > m.start(0) else 0) + 3
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col = index - last + 1
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else:
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indent = ' '
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offset = None
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if len(text):
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# Regardless of whether we are presented with `\r\n`, `\r`, or `\n`,
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# we will render the output with just `\n`. We will still log the column
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# correctly though.
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text.append('\n')
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text.append('{}{}'.format(indent, linetext))
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if offset is not None:
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text.append('\n')
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text.append(' ' * (col + offset) + '^')
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line = current_line
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current_line += 1
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last = m.end(0)
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return ''.join(text), line, col
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