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Code Issues Projects Releases Packages Wiki Activity Actions 8

- added lookbehind support (?<=pattern), (?<!pattern).

Browse source 
the pattern must have a fixed width.

- got rid of array-module dependencies; the match pro-
  gram is now stored inside the pattern object, rather
  than in an extra string buffer.

- cleaned up a various of potential leaks, api abuses,
  and other minors in the engine module.

- use mal's new isalnum macro, rather than my own work-
  around.

- untabified test_sre.py.  seems like I removed a couple
  of trailing spaces in the process...
This commit is contained in:
Fredrik Lundh 2000-07-03 18:44:21 +00:00
parent 40c48685a2
commit 6f01398236
5 changed files with 138 additions and 104 deletions
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12
Lib/sre_parse.py
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@ -482,9 +482,15 @@ def _parse(source, state):
if source.next is None or source.next == ")":
break
source.get()
elif source.next in ("=", "!"):
elif source.next in ("=", "!", "<"):
# lookahead assertions
char = source.get()
dir = 1
if char == "<":
if source.next not in ("=", "!"):
raise error, "syntax error"
dir = -1 # lookbehind
char = source.get()
b = []
while 1:
p = _parse(source, state)
@ -493,9 +499,9 @@ def _parse(source, state):
b.append(p)
p = _branch(state, b)
if char == "=":
subpattern.append((ASSERT, p))
subpattern.append((ASSERT, (dir, p)))
else:
subpattern.append((ASSERT_NOT, p))
subpattern.append((ASSERT_NOT, (dir, p)))
break
elif source.match("|"):
b.append(p)