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110 lines
3 KiB
Python
110 lines
3 KiB
Python
"""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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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):
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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, pattern=None, index=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(SelectorSyntaxError, self).__init__(msg)
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def deprecated(message, stacklevel=2): # pragma: no cover
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"""
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Raise a `DeprecationWarning` when wrapped function/method is called.
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Borrowed from https://stackoverflow.com/a/48632082/866026
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"""
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def _decorator(func):
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@wraps(func)
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def _func(*args, **kwargs):
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warnings.warn(
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"'{}' is deprecated. {}".format(func.__name__, 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 _func
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return _decorator
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def warn_deprecated(message, stacklevel=2): # 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, index):
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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 = []
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line = 1
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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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