def _replace(self, match: re.Match, replacement: str,
operation: Callable) -> str:
groups = match.groupdict()
if '%s' in replacement:
token = groups.get('token')
prefix = ''
suffix = ''
if token:
# Looks like prefix/suffix groups matter only if token-group
# was in a pattern
prefix = groups.get('prefix', '')
suffix = groups.get('suffix', '')
else:
token = match.group()
alias = operation(token)
replacement = replacement.replace('%s', prefix + alias + suffix)
replacement = self._fix_replacement_groups(replacement)
try:
return match.expand(replacement)
except IndexError as error:
raise TransformerError(f'Invalid replacement: {error}')
def replace(match: re.Match) -> str:
variables = match.groupdict()
variable_parts = {}
for capture, (variable, directive) in date_patterns.captures.items():
parts = variable_parts.setdefault(variable, {})
parts[directive] = variables[capture]
for variable, parts in variable_parts.items():
directives, values = zip(*parts.items())
fmt = " ".join(map("%{}".format, directives))
value = " ".join(values)
variables[variable] = datetime.datetime.strptime(value, fmt)
return match.expand(replacement.format_map(variables))
def expand_match(match: re.Match, value: Any) -> Any:
""" Return the value obtained by doing backslash substitution on the template string template
:param match: The match object.
:param value: The template value.
:return: The value replaced.
"""
if isinstance(value, dict):
return {
expand_match(match, k): expand_match(match, v)
for k, v in value.items()
}
elif isinstance(value, list):
return [expand_match(match, v) for v in value]
elif isinstance(value, str):
return match.expand(value.replace(r'\0', r'\g<0>'))
else:
return value
def expand_template(match: re.Match, template: Any) -> Any:
"""
Return the string obtained by doing backslash substitution on the template.
:param match: The match object.
:param template: The template.
:return: The template replaced with backslash substitution symbols.
"""
if template is None:
return match.group(0)
elif isinstance(template, str):
return match.expand(template.replace(r'\0', r'\g<0>'))
elif isinstance(template, list):
return [expand_template(match, t) for t in template]
elif isinstance(template, dict):
return {expand_template(match, k): expand_template(match, v) for k, v in template.items()}
else:
return template
def __call__(self, match: re.Match):
matched = match.group(0)
replaced = match.expand(self.replacement).format(
self.manager._generate_id(matched))
self.occurrences.append((matched, replaced))
return replaced
def validate_replacement(re_match: re.Match, replacement_pattern: str):
"""Test if it's valid in terms of regex rules"""
simplified = replacement_pattern.replace('\\L', '').replace('\\U', '')
simplified = re.sub(r'\\P(\d+)', '', simplified)
re_match.expand(simplified)
