/usr/lib/python3/dist-packages/aeidon/finder.py is in python3-aeidon 0.24.3-1.
This file is owned by root:root, with mode 0o644.
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# Copyright (C) 2005-2007,2009,2012 Osmo Salomaa
#
# This file is part of Gaupol.
#
# Gaupol is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# Gaupol is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Gaupol. If not, see <http://www.gnu.org/licenses/>.
"""String and regular expression finder and replacer."""
import aeidon
import re
__all__ = ("Finder",)
class Finder(object, metaclass=aeidon.Contractual):
"""
String and regular expression finder and replacer.
:ivar ignore_case: ``True`` to ignore case when finding matches
:ivar match: Regular expression object for the latest match of pattern
:ivar match_span: Tuple of start and end position for match
:ivar pattern: String or regular expression object to find
:ivar pos: Current offset from the beginning of the text
:ivar replacement: Plain- or regular expression replacement string
:ivar text: Target text to find matches of pattern in
"""
def __init__(self):
"""Initialize a Finder object."""
self.ignore_case = False
self.match = None
self.match_span = None
self.pattern = None
self.pos = None
self.replacement = None
self.text = None
def _invariant(self):
if self.pos is not None:
assert (0 <= self.pos <= len(self.text))
def next_require(self):
assert self.pattern is not None
def next_ensure(self, value):
for pos in value:
assert (0 <= pos <= len(self.text))
def next(self):
"""
Find the next match of pattern.
Raise :exc:`StopIteration` if no next match found.
Return tuple of match start, end position.
"""
if self.pos is None:
# Start new search from beginning.
self.pos = 0
if isinstance(self.pattern, str):
text = self.text
pattern = self.pattern
if self.ignore_case:
text = text.lower()
pattern = pattern.lower()
try:
index = text.index(pattern, self.pos)
except ValueError:
raise StopIteration
self.match_span = (index, index + len(pattern))
else: # Regular expression
match = self.pattern.search(self.text, self.pos)
if match is None:
raise StopIteration
# Avoid getting stuck with zero-length regular expressions.
if match.span() == self.match_span == (self.pos, self.pos):
if self.pos == len(self.text):
raise StopIteration
self.pos += 1
return self.next()
self.match = match
self.match_span = match.span()
self.pos = self.match_span[1]
return self.match_span
def previous_require(self):
assert self.pattern is not None
def previous_ensure(self, value):
for pos in value:
assert (0 <= pos <= len(self.text))
def previous(self):
"""
Find the previous match of pattern.
Raise :exc:`StopIteration` if no previous match found.
Return tuple of match start, end position.
"""
if self.pos is None:
# Start new search from end.
self.pos = len(self.text)
if isinstance(self.pattern, str):
text = self.text
pattern = self.pattern
if self.ignore_case:
text = text.lower()
pattern = pattern.lower()
try:
index = text.rindex(pattern, 0, self.pos)
except ValueError:
raise StopIteration
self.match_span = (index, index + len(pattern))
else: # Regular expression
iterator = self.pattern.finditer(self.text)
match = None
while True:
try:
candidate = next(iterator)
if candidate.end() > self.pos:
raise StopIteration
except StopIteration:
break
match = candidate
if match is None:
raise StopIteration
# Avoid getting stuck with zero-length regular expressions.
if match.span() == self.match_span == (self.pos, self.pos):
if self.pos == 0:
raise StopIteration
self.pos -= 1
return self.previous()
self.match = match
self.match_span = match.span()
self.pos = self.match_span[0]
return self.match_span
def replace_require(self, next=True):
assert self.match_span is not None
assert self.pattern is not None
assert self.replacement is not None
def replace(self, next=True):
"""
Replace the current match of pattern.
`next` should be ``True`` to finish at end of match, ``False`` for
beginning. Raise :exc:`re.error` if bad replacement.
"""
a, z = self.match_span
orig_length = len(self.text)
replacement = self.replacement
if not isinstance(self.pattern, str):
replacement = self.match.expand(self.replacement)
self.text = self.text[:a] + replacement + self.text[z:]
shift = len(self.text) - orig_length
self.pos = ((z + shift) if next else a)
# Adapt match span to new text length to avoid
# getting stuck with zero-length regular expressions.
if next and (self.match_span[0] == self.match_span[1]):
self.match_span = (self.pos, self.pos)
def replace_all_require(self):
assert self.pattern is not None
assert self.replacement is not None
def replace_all(self):
"""
Replace all occurences of pattern.
Raise :exc:`re.error` if bad replacement.
Return the amount of substitutions made.
"""
self.pos = 0
self.match = None
self.match_span = None
count = 0
while True:
try:
self.next()
except StopIteration:
self.pos = len(self.text)
self.match_span = None
break
self.replace()
count += 1
return count
def set_regex(self, pattern, flags=re.DOTALL|re.MULTILINE):
"""
Set and use regular expression as pattern.
The default value for `flags` is ``DOTALL`` and ``MULTILINE``.
``IGNORECASE`` is automatically added to flags if :attr:`ignore_case`
is ``True``.
Raise :exc:`re.error` if bad pattern.
"""
if self.ignore_case:
flags = flags | re.IGNORECASE
self.pattern = re.compile(pattern, flags)
def set_text(self, text):
"""Set the target text to search in and reset position."""
self.text = text
self.match = None
self.match_span = None
self.pos = None
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