/usr/lib/python3/dist-packages/aeidon/parser.py is in python3-aeidon 1.3.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | # -*- coding: utf-8 -*-
# Copyright (C) 2005 Osmo Salomaa
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""Text parser for markup-tag-aware text editing."""
import aeidon
__all__ = ("Parser",)
class Parser(aeidon.Finder):
"""
Text parser for markup-tag-aware text editing.
:ivar clean_func: Function to clean tags or ``None``
:ivar _margins: Start tag, end tag that every line is wrapped in
:ivar re_tag: Regular expression object to match any tag
:ivar _tags: List of lists of markup tag, position
The purpose of :class:`Parser` is to split text to the actual text and its
markup tags, allowing the text to be edited while keeping its tags separate
and intact. An example would be replacing all "i"s with "j"s without
changing italic markup::
>>> import re
>>> parser = aeidon.Parser(re.compile(r"<.+?>"))
>>> parser.set_text("<i>iii</i>")
>>> parser.pattern = "i"
>>> parser.replacement = "j"
>>> parser.replace_all()
3
>>> parser.get_text()
'<i>jjj</i>'
"""
def __init__(self, re_tag=None, clean_func=None):
"""Initialize a :class:`Parser` instance."""
aeidon.Finder.__init__(self)
self.clean_func = clean_func
self._margins = None
self.re_tag = re_tag
self._tags = None
def get_text(self):
"""Reassemble the full text and return it."""
if not self.text:
self._margins = []
self._tags = []
text = self.text[:]
for pos, tag in self._tags:
text = text[:pos] + tag + text[pos:]
if self._margins:
text = text.replace("\n", "{1}\n{0}".format(*self._margins))
text = self._margins[0] + text + self._margins[1]
if self.clean_func is not None:
text = self.clean_func(text)
return text
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 = self.match_span[0]
orig_text = self.text[:]
aeidon.Finder.replace(self, next)
shift = len(self.text) - len(orig_text)
self._shift_tags(a, shift, orig_text)
def _set_margins(self, text):
"""Find the margin markup tags in `text` if such exist."""
lines = text.split("\n")
line = lines[0]
start_tag = ""
while True:
match = self.re_tag.match(line)
if match is None: break
a, z = match.span()
start_tag += line[a:z]
line = line[z:]
if not start_tag: return
if not all(x.startswith(start_tag) for x in lines): return
end_tag = ""
while True:
iterator = self.re_tag.finditer(line)
match = aeidon.util.last(iterator)
if match is None: break
a, z = match.span()
if z != len(line): return
end_tag = line[a:z] + end_tag
line = line[:a]
if not all(x.endswith(end_tag) for x in lines): return
for line in (x[len(start_tag):-len(end_tag)] for x in lines):
# Ensure that no other tags exists on any of the lines.
if self.re_tag.search(line) is not None: return
self._margins = [start_tag, end_tag]
def _set_tags(self, text):
"""Find markup tags in `text`."""
for match in self.re_tag.finditer(text):
a, z = match.span()
self._tags.append([a, text[a:z]])
def set_text(self, text):
"""Set the target text to search in and parse it."""
aeidon.Finder.set_text(self, text)
self._margins = []
self._tags = []
if self.re_tag is None: return
if text.count("\n"):
self._set_margins(text)
if not self._margins:
self._set_tags(text)
self.text = self.re_tag.sub("", text)
def _shift_tags(self, pos, shift, orig_text):
"""Shift all markup tags after `pos`."""
if not shift: return
if not self._tags: return
# Try to determine whether a tag at position pos would be an opening
# or a closing tag, i.e. attached to the next or the previous word.
opening = True
if pos < len(orig_text):
if orig_text[pos].isspace():
opening = False
elif pos == len(orig_text):
opening = False
closing = not opening
# Get length of tags *before* position. Try to add strings (positive
# shift) inside tags and remove strings (negative shift) after tags.
pos_with_tags = pos
for tag_pos, tag in self._tags:
if shift > 0 and closing:
if tag_pos < pos_with_tags:
pos_with_tags += len(tag)
elif tag_pos <= pos_with_tags:
pos_with_tags += len(tag)
between_length = 0
for i, (tag_pos, tag) in enumerate(self._tags):
orig_end = pos_with_tags - shift + between_length
if (shift < 0) and (pos_with_tags < tag_pos < orig_end):
# If tag is in the middle of what is being removed, it must be
# shifted to the start of the removal block, but not so far
# that it would overlap with preceding tags.
self._tags[i][0] = pos_with_tags + between_length
between_length += len(tag)
elif tag_pos >= pos_with_tags:
self._tags[i][0] += shift
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