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