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-rw-r--r--Lib/dos-8x3/sre_comp.py329
1 files changed, 192 insertions, 137 deletions
diff --git a/Lib/dos-8x3/sre_comp.py b/Lib/dos-8x3/sre_comp.py
index c042375..e48a7eb 100644
--- a/Lib/dos-8x3/sre_comp.py
+++ b/Lib/dos-8x3/sre_comp.py
@@ -18,157 +18,212 @@ from sre_constants import *
# find an array type code that matches the engine's code size
for WORDSIZE in "BHil":
if len(array.array(WORDSIZE, [0]).tostring()) == _sre.getcodesize():
- break
+ break
else:
raise RuntimeError, "cannot find a useable array type"
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(CH_LOCALE[CHCODES[av]])
- elif flags & SRE_FLAG_UNICODE:
- emit(CH_UNICODE[CHCODES[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 IN:
- if flags & SRE_FLAG_IGNORECASE:
- emit(OPCODES[OP_IGNORE[op]])
- def fixup(literal, flags=flags):
- return _sre.getlower(ord(literal), flags)
- else:
- emit(OPCODES[op])
- fixup = ord
- skip = len(code); emit(0)
- for op, av in av:
- emit(OPCODES[op])
- if op is NEGATE:
- pass
- elif op is LITERAL:
- emit(fixup(av))
- elif op is RANGE:
- emit(fixup(av[0]))
- emit(fixup(av[1]))
- elif op is CATEGORY:
- if flags & SRE_FLAG_LOCALE:
- emit(CH_LOCALE[CHCODES[av]])
- elif flags & SRE_FLAG_UNICODE:
- emit(CH_UNICODE[CHCODES[av]])
- else:
- emit(CHCODES[av])
- else:
- 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:
- emit(OPCODES[op])
- emit(ord(av))
- elif op is MARK:
- emit(OPCODES[op])
- emit(av)
- elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
- if flags & SRE_FLAG_TEMPLATE:
- emit(OPCODES[REPEAT])
- 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> need a better way to figure out when
- # it's safe to use this one (in the parser, probably)
- emit(OPCODES[MAX_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:
- emit(OPCODES[op])
- skip = len(code); emit(0)
- emit(av[0])
- emit(av[1])
- _compile(code, av[2], flags)
- emit(OPCODES[SUCCESS])
- code[skip] = len(code) - skip
- elif op is SUBPATTERN:
- group = av[0]
- if group:
- emit(OPCODES[MARK])
- emit((group-1)*2)
- _compile(code, av[1], flags)
- if group:
- emit(OPCODES[MARK])
- emit((group-1)*2+1)
- else:
- raise ValueError, ("unsupported operand type", op)
+ if op in (LITERAL, NOT_LITERAL):
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ else:
+ emit(OPCODES[op])
+ emit(av)
+ elif op is IN:
+ if flags & SRE_FLAG_IGNORECASE:
+ emit(OPCODES[OP_IGNORE[op]])
+ def fixup(literal, flags=flags):
+ return _sre.getlower(literal, flags)
+ else:
+ emit(OPCODES[op])
+ fixup = lambda x: x
+ skip = len(code); emit(0)
+ for op, av in av:
+ emit(OPCODES[op])
+ if op is NEGATE:
+ pass
+ elif op is LITERAL:
+ emit(fixup(av))
+ elif op is RANGE:
+ emit(fixup(av[0]))
+ emit(fixup(av[1]))
+ elif op is CATEGORY:
+ if flags & SRE_FLAG_LOCALE:
+ emit(CHCODES[CH_LOCALE[av]])
+ elif flags & SRE_FLAG_UNICODE:
+ emit(CHCODES[CH_UNICODE[av]])
+ else:
+ emit(CHCODES[av])
+ else:
+ raise error, "internal: unsupported set operator"
+ emit(OPCODES[FAILURE])
+ code[skip] = len(code) - skip
+ elif op is ANY:
+ if flags & SRE_FLAG_DOTALL:
+ emit(OPCODES[op])
+ 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])
+ 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> need a better way to figure out when
+ # it's safe to use this one (in the parser, probably)
+ emit(OPCODES[MAX_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:
+ emit(OPCODES[op])
+ skip = len(code); emit(0)
+ emit(av[0])
+ emit(av[1])
+ _compile(code, av[2], flags)
+ emit(OPCODES[SUCCESS])
+ code[skip] = len(code) - skip
+ elif op is SUBPATTERN:
+ group = av[0]
+ if group:
+ emit(OPCODES[MARK])
+ emit((group-1)*2)
+ _compile(code, av[1], 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)
+
+def _compile_info(code, pattern, flags):
+ # internal: compile an info block. in the current version,
+ # this contains min/max pattern width and a literal prefix,
+ # if any
+ lo, hi = pattern.getwidth()
+ if lo == 0:
+ return # not worth it
+ # look for a literal prefix
+ prefix = []
+ if not (flags & SRE_FLAG_IGNORECASE):
+ for op, av in pattern.data:
+ if op is LITERAL:
+ prefix.append(av)
+ else:
+ break
+ # add an info block
+ emit = code.append
+ emit(OPCODES[INFO])
+ skip = len(code); emit(0)
+ # literal flag
+ mask = 0
+ if len(prefix) == len(pattern.data):
+ mask = 1
+ emit(mask)
+ # pattern length
+ emit(lo)
+ if hi < 32768:
+ emit(hi)
+ else:
+ emit(0)
+ # add literal prefix
+ emit(len(prefix))
+ if prefix:
+ code.extend(prefix)
+ # generate overlap table
+ table = [-1] + ([0]*len(prefix))
+ for i in range(len(prefix)):
+ table[i+1] = table[i]+1
+ while table[i+1] > 0 and prefix[i] != prefix[table[i+1]-1]:
+ table[i+1] = table[table[i+1]-1]+1
+ code.extend(table[1:]) # don't store first entry
+ code[skip] = len(code) - skip
def compile(p, flags=0):
# internal: convert pattern list to internal format
+
+ # compile, as necessary
if type(p) in (type(""), type(u"")):
- import sre_parse
- pattern = p
- p = sre_parse.parse(p)
+ import sre_parse
+ pattern = p
+ p = sre_parse.parse(p)
else:
- pattern = None
+ pattern = None
+
flags = p.pattern.flags | flags
code = []
+
+ # compile info block
+ _compile_info(code, p, flags)
+
+ # compile the pattern
_compile(code, p.data, flags)
+
code.append(OPCODES[SUCCESS])
- # FIXME: <fl> get rid of this limitation
+
+ # FIXME: <fl> get rid of this limitation!
assert p.pattern.groups <= 100,\
- "sorry, but this version only supports 100 named groups"
+ "sorry, but this version only supports 100 named groups"
+
return _sre.compile(
- pattern, flags,
- array.array(WORDSIZE, code).tostring(),
- p.pattern.groups-1, p.pattern.groupdict
- )
+ pattern, flags,
+ array.array(WORDSIZE, code).tostring(),
+ p.pattern.groups-1, p.pattern.groupdict
+ )
generated by cgit v0.12 at 2025-01-27 02:42:02 (GMT)