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- fixed lookahead assertions (#10, #11, #12)

Browse source 
- untabified sre_constants.py
This commit is contained in:
Fredrik Lundh 2000-06-30 10:41:31 +00:00
parent a4657f736c
commit 43b3b49b5a
6 changed files with 146 additions and 90 deletions
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100
Lib/sre_compile.py
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@ -26,52 +26,12 @@ def _compile(code, pattern, flags):
# internal: compile a (sub)pattern
emit = code.append
for op, av in pattern:
if op is ANY:
if flags & SRE_FLAG_DOTALL:
emit(OPCODES[op])
else:
emit(OPCODES[CATEGORY])
emit(CHCODES[CATEGORY_NOT_LINEBREAK])
elif op in (SUCCESS, FAILURE):
emit(OPCODES[op])
elif op is AT:
emit(OPCODES[op])
if flags & SRE_FLAG_MULTILINE:
emit(ATCODES[AT_MULTILINE[av]])
else:
emit(ATCODES[av])
elif op is BRANCH:
emit(OPCODES[op])
tail = []
for av in av[1]:
skip = len(code); emit(0)
_compile(code, av, flags)
emit(OPCODES[JUMP])
tail.append(len(code)); emit(0)
code[skip] = len(code) - skip
emit(0) # end of branch
for tail in tail:
code[tail] = len(code) - tail
elif op is CALL:
emit(OPCODES[op])
skip = len(code); emit(0)
_compile(code, av, flags)
emit(OPCODES[SUCCESS])
code[skip] = len(code) - skip
elif op is CATEGORY:
emit(OPCODES[op])
if flags & SRE_FLAG_LOCALE:
emit(CHCODES[CH_LOCALE[av]])
elif flags & SRE_FLAG_UNICODE:
emit(CHCODES[CH_UNICODE[av]])
else:
emit(CHCODES[av])
elif op is GROUP:
if op in (LITERAL, NOT_LITERAL):
if flags & SRE_FLAG_IGNORECASE:
emit(OPCODES[OP_IGNORE[op]])
else:
emit(OPCODES[op])
emit(av-1)
emit(ord(av))
elif op is IN:
if flags & SRE_FLAG_IGNORECASE:
emit(OPCODES[OP_IGNORE[op]])
@ -101,15 +61,12 @@ def _compile(code, pattern, flags):
raise error, "internal: unsupported set operator"
emit(OPCODES[FAILURE])
code[skip] = len(code) - skip
elif op in (LITERAL, NOT_LITERAL):
if flags & SRE_FLAG_IGNORECASE:
emit(OPCODES[OP_IGNORE[op]])
else:
elif op is ANY:
if flags & SRE_FLAG_DOTALL:
emit(OPCODES[op])
emit(ord(av))
elif op is MARK:
emit(OPCODES[op])
emit(av)
else:
emit(OPCODES[CATEGORY])
emit(CHCODES[CATEGORY_NOT_LINEBREAK])
elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
if flags & SRE_FLAG_TEMPLATE:
emit(OPCODES[REPEAT])
@ -150,6 +107,49 @@ def _compile(code, pattern, flags):
if group:
emit(OPCODES[MARK])
emit((group-1)*2+1)
elif op in (SUCCESS, FAILURE):
emit(OPCODES[op])
elif op in (ASSERT, ASSERT_NOT, CALL):
emit(OPCODES[op])
skip = len(code); emit(0)
_compile(code, av, flags)
emit(OPCODES[SUCCESS])
code[skip] = len(code) - skip
elif op is AT:
emit(OPCODES[op])
if flags & SRE_FLAG_MULTILINE:
emit(ATCODES[AT_MULTILINE[av]])
else:
emit(ATCODES[av])
elif op is BRANCH:
emit(OPCODES[op])
tail = []
for av in av[1]:
skip = len(code); emit(0)
_compile(code, av, flags)
emit(OPCODES[JUMP])
tail.append(len(code)); emit(0)
code[skip] = len(code) - skip
emit(0) # end of branch
for tail in tail:
code[tail] = len(code) - tail
elif op is CATEGORY:
emit(OPCODES[op])
if flags & SRE_FLAG_LOCALE:
emit(CHCODES[CH_LOCALE[av]])
elif flags & SRE_FLAG_UNICODE:
emit(CHCODES[CH_UNICODE[av]])
else:
emit(CHCODES[av])
elif op is GROUP:
if flags & SRE_FLAG_IGNORECASE:
emit(OPCODES[OP_IGNORE[op]])
else:
emit(OPCODES[op])
emit(av-1)
elif op is MARK:
emit(OPCODES[op])
emit(av)
else:
raise ValueError, ("unsupported operand type", op)