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Fix notif kws that start/end with non-word chars

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Only prepend / append word bounary characters if the search
expression starts or ends with a word character, otherwise they
don't work because there's no word bounary between whitespace and
a non-word char.
This commit is contained in:
David Baker 2017-10-05 11:33:30 +01:00
parent 93b0cf7a99
commit 6748f0a579
1 changed files with 21 additions and 2 deletions
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23
synapse/push/push_rule_evaluator.py
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@ -26,6 +26,8 @@ logger = logging.getLogger(__name__)
GLOB_REGEX = re.compile(r'\\\[(\\\!|)(.*)\\\]')
IS_GLOB = re.compile(r'[\?\*\[\]]')
INEQUALITY_EXPR = re.compile("^([=<>]*)([0-9]*)$")
STARTS_WITH_WORD_CHAR_REGEX = re.compile(r"^\w")
ENDS_WITH_WORD_CHAR_REGEX = re.compile(r"\w$")
def _room_member_count(ev, condition, room_member_count):
@ -183,7 +185,7 @@ def _glob_to_re(glob, word_boundary):
r,
)
if word_boundary:
r = r"\b%s\b" % (r,)
r = _re_word_boundary(r)
return re.compile(r, flags=re.IGNORECASE)
else:
@ -192,13 +194,30 @@ def _glob_to_re(glob, word_boundary):
return re.compile(r, flags=re.IGNORECASE)
elif word_boundary:
r = re.escape(glob)
r = r"\b%s\b" % (r,)
r = _re_word_boundary(r)
return re.compile(r, flags=re.IGNORECASE)
else:
r = "^" + re.escape(glob) + "$"
return re.compile(r, flags=re.IGNORECASE)
def _re_word_boundary(r):
"""
Adds word boundary characters to the start and end of an
expression to require that the match occur as a whole word,
but do so respecting the fact that strings starting or ending
with non-word characters will change word boundaries.
"""
# Matching a regex string aginst a regex, since by definition
# \b is the boundary between a \w and a \W, so match \w at the
# start or end of the expression (although this will miss, eg.
# "[dl]og")
if STARTS_WITH_WORD_CHAR_REGEX.search(r):
r = r"\b%s" % (r,)
if ENDS_WITH_WORD_CHAR_REGEX.search(r):
r = r"%s\b" % (r,)
return r
def _flatten_dict(d, prefix=[], result=None):
if result is None: