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final 0.9.8 updates:

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-- added REPEAT_ONE operator
-- added ANY_ALL operator (used to represent "(?s).")
This commit is contained in:
Fredrik Lundh 2000-08-01 22:47:49 +00:00
parent fb06539e99
commit e186983842
6 changed files with 105 additions and 68 deletions
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51
Lib/sre_compile.py
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@ -73,6 +73,13 @@ def _charset(charset, fixup=None):
return out
return charset
def _simple(av):
# check if av is a "simple" operator
lo, hi = av[2].getwidth()
if lo == 0:
raise error, "nothing to repeat"
return lo == hi == 1 and av[2][0][0] != SUBPATTERN
def _compile(code, pattern, flags):
# internal: compile a (sub)pattern
emit = code.append
@ -116,10 +123,9 @@ def _compile(code, pattern, flags):
code[skip] = len(code) - skip
elif op is ANY:
if flags & SRE_FLAG_DOTALL:
emit(OPCODES[op])
emit(OPCODES[ANY_ALL])
else:
emit(OPCODES[CATEGORY])
emit(CHCODES[CATEGORY_NOT_LINEBREAK])
emit(OPCODES[ANY])
elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
if flags & SRE_FLAG_TEMPLATE:
raise error, "internal: unsupported template operator"
@ -130,30 +136,25 @@ def _compile(code, pattern, flags):
_compile(code, av[2], flags)
emit(OPCODES[SUCCESS])
code[skip] = len(code) - skip
elif _simple(av) and op == MAX_REPEAT:
emit(OPCODES[REPEAT_ONE])
skip = len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
emit(OPCODES[SUCCESS])
code[skip] = len(code) - skip
else:
lo, hi = av[2].getwidth()
if lo == 0:
raise error, "nothing to repeat"
if 0 and lo == hi == 1 and op is MAX_REPEAT:
# FIXME: <fl> fast and wrong (but we'll fix that)
emit(OPCODES[REPEAT_ONE])
skip = len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
emit(OPCODES[SUCCESS])
code[skip] = len(code) - skip
emit(OPCODES[REPEAT])
skip = len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
code[skip] = len(code) - skip
if op == MAX_REPEAT:
emit(OPCODES[MAX_UNTIL])
else:
emit(OPCODES[REPEAT])
skip = len(code); emit(0)
emit(av[0])
emit(av[1])
_compile(code, av[2], flags)
code[skip] = len(code) - skip
if op == MAX_REPEAT:
emit(OPCODES[MAX_UNTIL])
else:
emit(OPCODES[MIN_UNTIL])
emit(OPCODES[MIN_UNTIL])
elif op is SUBPATTERN:
if av[0]:
emit(OPCODES[MARK])