Fredrik Lundh: here's the 96.6% version of SRE
This commit is contained in:
Jeremy Hylton
parent
0292d78e91
commit
b1aa19515f
123
Lib/sre.py
123
Lib/sre.py
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@ -1,4 +1,3 @@
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# -*- Mode: Python; tab-width: 4 -*-
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#
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# Secret Labs' Regular Expression Engine
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# $Id$
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@ -7,39 +6,127 @@
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#
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# Copyright (c) 1998-2000 by Secret Labs AB. All rights reserved.
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#
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# This code can only be used for 1.6 alpha testing. All other use
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# require explicit permission from Secret Labs AB.
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#
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# Portions of this engine have been developed in cooperation with
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# CNRI. Hewlett-Packard provided funding for 1.6 integration and
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# other compatibility work.
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#
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"""
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this is a long string
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"""
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import sre_compile
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# flags
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I = IGNORECASE = sre_compile.SRE_FLAG_IGNORECASE
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L = LOCALE = sre_compile.SRE_FLAG_LOCALE
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M = MULTILINE = sre_compile.SRE_FLAG_MULTILINE
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S = DOTALL = sre_compile.SRE_FLAG_DOTALL
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X = VERBOSE = sre_compile.SRE_FLAG_VERBOSE
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# --------------------------------------------------------------------
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# public interface
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def compile(pattern, flags=0):
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return sre_compile.compile(pattern, _fixflags(flags))
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# FIXME: add docstrings
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def match(pattern, string, flags=0):
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return compile(pattern, _fixflags(flags)).match(string)
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return _compile(pattern, flags).match(string)
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def search(pattern, string, flags=0):
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return compile(pattern, _fixflags(flags)).search(string)
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return _compile(pattern, flags).search(string)
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# FIXME: etc
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def sub(pattern, repl, string, count=0):
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return _compile(pattern).sub(repl, string, count)
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def subn(pattern, repl, string, count=0):
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return _compile(pattern).subn(repl, string, count)
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def split(pattern, string, maxsplit=0):
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return _compile(pattern).split(string, maxsplit)
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def findall(pattern, string, maxsplit=0):
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return _compile(pattern).findall(string, maxsplit)
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def compile(pattern, flags=0):
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return _compile(pattern, flags)
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def escape(pattern):
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s = list(pattern)
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for i in range(len(pattern)):
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c = pattern[i]
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if not ("a" <= c <= "z" or "A" <= c <= "Z" or "0" <= c <= "9"):
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if c == "\000":
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s[i] = "\\000"
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else:
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s[i] = "\\" + c
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return pattern[:0].join(s)
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# --------------------------------------------------------------------
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# helpers
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# internals
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def _fixflags(flags):
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# convert flag bitmask to sequence
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assert not flags
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return ()
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_cache = {}
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_MAXCACHE = 100
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def _compile(pattern, flags=0):
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# internal: compile pattern
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tp = type(pattern)
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if tp not in (type(""), type(u"")):
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return pattern
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key = (tp, pattern, flags)
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try:
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return _cache[key]
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except KeyError:
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pass
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p = sre_compile.compile(pattern, flags)
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if len(_cache) >= _MAXCACHE:
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_cache.clear()
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_cache[key] = p
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return p
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def _sub(pattern, template, string, count=0):
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# internal: pattern.sub implementation hook
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return _subn(pattern, template, string, count)[0]
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def _expand(match, template):
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# internal: expand template
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return template # FIXME
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def _subn(pattern, template, string, count=0):
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# internal: pattern.subn implementation hook
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if callable(template):
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filter = callable
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else:
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# FIXME: prepare template
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def filter(match, template=template):
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return _expand(match, template)
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n = i = 0
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s = []
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append = s.append
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c = pattern.cursor(string)
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while not count or n < count:
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m = c.search()
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if not m:
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break
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j = m.start()
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if j > i:
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append(string[i:j])
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append(filter(m))
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i = m.end()
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n = n + 1
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if i < len(string):
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append(string[i:])
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return string[:0].join(s), n
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def _split(pattern, string, maxsplit=0):
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# internal: pattern.split implementation hook
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n = i = 0
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s = []
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append = s.append
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c = pattern.cursor(string)
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while not maxsplit or n < maxsplit:
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m = c.search()
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if not m:
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break
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j = m.start()
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append(string[i:j])
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i = m.end()
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n = n + 1
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if i < len(string):
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append(string[i:])
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return s
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@ -14,9 +14,6 @@
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# other compatibility work.
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#
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# FIXME: <fl> formalize (objectify?) and document the compiler code
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# format, so that other frontends can use this compiler
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import array, string, sys
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import _sre
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@ -45,64 +42,70 @@ class Code:
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self.data.append(code)
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def todata(self):
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# print self.data
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try:
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return array.array(WORDSIZE, self.data).tostring()
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except OverflowError:
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print self.data
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raise
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def _lower(literal):
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# return _sre._lower(literal) # FIXME
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return string.lower(literal)
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def _compile(code, pattern, flags):
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def _compile(code, pattern, flags, level=0):
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append = code.append
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for op, av in pattern:
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if op is ANY:
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if "s" in flags:
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append(CODES[op]) # any character at all!
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if flags & SRE_FLAG_DOTALL:
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append(OPCODES[op]) # any character at all!
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else:
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append(CODES[NOT_LITERAL])
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append(10)
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append(OPCODES[CATEGORY])
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append(CHCODES[CATEGORY_NOT_LINEBREAK])
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elif op in (SUCCESS, FAILURE):
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append(CODES[op])
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append(OPCODES[op])
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elif op is AT:
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append(CODES[op])
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append(POSITIONS[av])
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append(OPCODES[op])
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if flags & SRE_FLAG_MULTILINE:
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append(ATCODES[AT_MULTILINE[av]])
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else:
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append(ATCODES[av])
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elif op is BRANCH:
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append(CODES[op])
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append(OPCODES[op])
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tail = []
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for av in av[1]:
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skip = len(code); append(0)
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_compile(code, av, flags)
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append(CODES[JUMP])
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_compile(code, av, flags, level)
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append(OPCODES[JUMP])
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tail.append(len(code)); append(0)
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code[skip] = len(code) - skip
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append(0) # end of branch
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for tail in tail:
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code[tail] = len(code) - tail
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elif op is CALL:
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append(CODES[op])
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append(OPCODES[op])
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skip = len(code); append(0)
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_compile(code, av, flags)
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append(CODES[SUCCESS])
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_compile(code, av, flags, level+1)
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append(OPCODES[SUCCESS])
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code[skip] = len(code) - skip
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elif op is CATEGORY: # not used by current parser
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append(CODES[op])
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append(CATEGORIES[av])
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append(OPCODES[op])
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if flags & SRE_FLAG_LOCALE:
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append(CH_LOCALE[CHCODES[av]])
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else:
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append(CHCODES[av])
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elif op is GROUP:
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if "i" in flags:
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append(CODES[MAP_IGNORE[op]])
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if flags & SRE_FLAG_IGNORECASE:
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append(OPCODES[OP_IGNORE[op]])
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else:
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append(CODES[op])
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append(av)
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append(OPCODES[op])
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append(av-1)
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elif op is IN:
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if "i" in flags:
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append(CODES[MAP_IGNORE[op]])
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if flags & SRE_FLAG_IGNORECASE:
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append(OPCODES[OP_IGNORE[op]])
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def fixup(literal):
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return ord(_lower(literal))
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return ord(literal.lower())
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else:
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append(CODES[op])
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append(OPCODES[op])
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fixup = ord
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skip = len(code); append(0)
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for op, av in av:
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append(CODES[op])
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append(OPCODES[op])
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if op is NEGATE:
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pass
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elif op is LITERAL:
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@ -111,58 +114,60 @@ def _compile(code, pattern, flags):
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append(fixup(av[0]))
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append(fixup(av[1]))
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elif op is CATEGORY:
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append(CATEGORIES[av])
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if flags & SRE_FLAG_LOCALE:
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append(CH_LOCALE[CHCODES[av]])
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else:
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append(CHCODES[av])
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else:
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raise ValueError, "unsupported set operator"
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append(CODES[FAILURE])
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append(OPCODES[FAILURE])
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code[skip] = len(code) - skip
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elif op in (LITERAL, NOT_LITERAL):
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if "i" in flags:
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append(CODES[MAP_IGNORE[op]])
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append(ord(_lower(av)))
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if flags & SRE_FLAG_IGNORECASE:
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append(OPCODES[OP_IGNORE[op]])
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append(ord(av.lower()))
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else:
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append(CODES[op])
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append(OPCODES[op])
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append(ord(av))
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elif op is MARK:
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append(CODES[op])
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append(OPCODES[op])
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append(av)
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elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
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lo, hi = av[2].getwidth()
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if lo == 0:
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raise SyntaxError, "cannot repeat zero-width items"
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if lo == hi == 1 and op is MAX_REPEAT:
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append(CODES[MAX_REPEAT_ONE])
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append(OPCODES[MAX_REPEAT_ONE])
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skip = len(code); append(0)
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append(av[0])
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append(av[1])
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_compile(code, av[2], flags)
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append(CODES[SUCCESS])
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_compile(code, av[2], flags, level+1)
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append(OPCODES[SUCCESS])
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code[skip] = len(code) - skip
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else:
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append(CODES[op])
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append(OPCODES[op])
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skip = len(code); append(0)
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append(av[0])
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append(av[1])
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_compile(code, av[2], flags)
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_compile(code, av[2], flags, level+1)
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if op is MIN_REPEAT:
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append(CODES[MIN_UNTIL])
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append(OPCODES[MIN_UNTIL])
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else:
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# FIXME: MAX_REPEAT PROBABLY DOESN'T WORK (?)
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append(CODES[MAX_UNTIL])
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append(OPCODES[MAX_UNTIL])
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code[skip] = len(code) - skip
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elif op is SUBPATTERN:
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## group = av[0]
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## if group:
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## append(CODES[MARK])
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## append((group-1)*2)
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_compile(code, av[1], flags)
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## if group:
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## append(CODES[MARK])
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## append((group-1)*2+1)
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group = av[0]
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if group:
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append(OPCODES[MARK])
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append((group-1)*2)
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_compile(code, av[1], flags, level+1)
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if group:
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append(OPCODES[MARK])
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append((group-1)*2+1)
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else:
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raise ValueError, ("unsupported operand type", op)
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def compile(p, flags=()):
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def compile(p, flags=0):
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# convert pattern list to internal format
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if type(p) in (type(""), type(u"")):
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import sre_parse
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@ -170,12 +175,10 @@ def compile(p, flags=()):
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p = sre_parse.parse(p)
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else:
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pattern = None
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# print p.getwidth()
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# print p
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flags = p.pattern.flags | flags
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code = Code()
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_compile(code, p.data, p.pattern.flags)
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code.append(CODES[SUCCESS])
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# print list(code.data)
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_compile(code, p.data, flags)
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code.append(OPCODES[SUCCESS])
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data = code.todata()
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if 0: # debugging
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print
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@ -183,5 +186,8 @@ def compile(p, flags=()):
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import sre_disasm
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sre_disasm.disasm(data)
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print "-" * 68
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# print len(data), p.pattern.groups, len(p.pattern.groupdict)
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return _sre.compile(pattern, data, p.pattern.groups-1, p.pattern.groupdict)
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return _sre.compile(
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pattern, flags,
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data,
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p.pattern.groups-1, p.pattern.groupdict
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)
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@ -48,20 +48,31 @@ SUBPATTERN = "subpattern"
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# positions
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AT_BEGINNING = "at_beginning"
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AT_BEGINNING_LINE = "at_beginning_line"
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AT_BOUNDARY = "at_boundary"
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AT_NON_BOUNDARY = "at_non_boundary"
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AT_END = "at_end"
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AT_END_LINE = "at_end_line"
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# categories
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CATEGORY_DIGIT = "category_digit"
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CATEGORY_NOT_DIGIT = "category_not_digit"
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CATEGORY_SPACE = "category_space"
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CATEGORY_NOT_SPACE = "category_not_space"
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CATEGORY_WORD = "category_word"
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CATEGORY_NOT_WORD = "category_not_word"
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CATEGORY_LINEBREAK = "category_linebreak"
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CATEGORY_NOT_LINEBREAK = "category_not_linebreak"
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CATEGORY_LOC_DIGIT = "category_loc_digit"
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CATEGORY_LOC_NOT_DIGIT = "category_loc_not_digit"
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CATEGORY_LOC_SPACE = "category_loc_space"
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CATEGORY_LOC_NOT_SPACE = "category_loc_not_space"
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CATEGORY_LOC_WORD = "category_loc_word"
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CATEGORY_LOC_NOT_WORD = "category_loc_not_word"
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CATEGORY_LOC_LINEBREAK = "category_loc_linebreak"
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CATEGORY_LOC_NOT_LINEBREAK = "category_loc_not_linebreak"
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CODES = [
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OPCODES = [
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# failure=0 success=1 (just because it looks better that way :-)
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FAILURE, SUCCESS,
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@ -87,45 +98,75 @@ CODES = [
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]
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# convert to dictionary
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c = {}
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i = 0
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for code in CODES:
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c[code] = i
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ATCODES = [
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AT_BEGINNING, AT_BEGINNING_LINE, AT_BOUNDARY,
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AT_NON_BOUNDARY, AT_END, AT_END_LINE
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]
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CHCODES = [
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CATEGORY_DIGIT, CATEGORY_NOT_DIGIT, CATEGORY_SPACE,
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CATEGORY_NOT_SPACE, CATEGORY_WORD, CATEGORY_NOT_WORD,
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CATEGORY_LINEBREAK, CATEGORY_NOT_LINEBREAK, CATEGORY_LOC_DIGIT,
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CATEGORY_LOC_NOT_DIGIT, CATEGORY_LOC_SPACE,
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CATEGORY_LOC_NOT_SPACE, CATEGORY_LOC_WORD, CATEGORY_LOC_NOT_WORD,
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CATEGORY_LOC_LINEBREAK, CATEGORY_LOC_NOT_LINEBREAK
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]
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def makedict(list):
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d = {}
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i = 0
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for item in list:
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d[item] = i
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i = i + 1
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CODES = c
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return d
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OPCODES = makedict(OPCODES)
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ATCODES = makedict(ATCODES)
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CHCODES = makedict(CHCODES)
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# replacement operations for "ignore case" mode
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MAP_IGNORE = {
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OP_IGNORE = {
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GROUP: GROUP_IGNORE,
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IN: IN_IGNORE,
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LITERAL: LITERAL_IGNORE,
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NOT_LITERAL: NOT_LITERAL_IGNORE
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}
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POSITIONS = {
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AT_BEGINNING: ord("a"),
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AT_BOUNDARY: ord("b"),
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AT_NON_BOUNDARY: ord("B"),
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AT_END: ord("z"),
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AT_MULTILINE = {
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AT_BEGINNING: AT_BEGINNING_LINE,
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AT_END: AT_END_LINE
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}
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CATEGORIES = {
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CATEGORY_DIGIT: ord("d"),
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CATEGORY_NOT_DIGIT: ord("D"),
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CATEGORY_SPACE: ord("s"),
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CATEGORY_NOT_SPACE: ord("S"),
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CATEGORY_WORD: ord("w"),
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||||
CATEGORY_NOT_WORD: ord("W"),
|
||||
CH_LOCALE = {
|
||||
CATEGORY_DIGIT: CATEGORY_LOC_DIGIT,
|
||||
CATEGORY_NOT_DIGIT: CATEGORY_LOC_NOT_DIGIT,
|
||||
CATEGORY_SPACE: CATEGORY_LOC_SPACE,
|
||||
CATEGORY_NOT_SPACE: CATEGORY_LOC_NOT_SPACE,
|
||||
CATEGORY_WORD: CATEGORY_LOC_WORD,
|
||||
CATEGORY_NOT_WORD: CATEGORY_LOC_NOT_WORD,
|
||||
CATEGORY_LINEBREAK: CATEGORY_LOC_LINEBREAK,
|
||||
CATEGORY_NOT_LINEBREAK: CATEGORY_LOC_NOT_LINEBREAK
|
||||
}
|
||||
|
||||
# flags
|
||||
SRE_FLAG_TEMPLATE = 1 # NYI
|
||||
SRE_FLAG_IGNORECASE = 2
|
||||
SRE_FLAG_LOCALE = 4
|
||||
SRE_FLAG_MULTILINE = 8
|
||||
SRE_FLAG_DOTALL = 16
|
||||
SRE_FLAG_VERBOSE = 32
|
||||
|
||||
if __name__ == "__main__":
|
||||
import string
|
||||
items = CODES.items()
|
||||
def dump(f, d, prefix):
|
||||
items = d.items()
|
||||
items.sort(lambda a, b: cmp(a[1], b[1]))
|
||||
f = open("sre_constants.h", "w")
|
||||
f.write("/* generated by sre_constants.py */\n")
|
||||
for k, v in items:
|
||||
f.write("#define SRE_OP_" + string.upper(k) + " " + str(v) + "\n")
|
||||
f.write("#define %s_%s %s\n" % (prefix, string.upper(k), v))
|
||||
f = open("sre_constants.h", "w")
|
||||
f.write("/* generated from sre_constants.py */\n")
|
||||
dump(f, OPCODES, "SRE_OP")
|
||||
dump(f, ATCODES, "SRE")
|
||||
dump(f, CHCODES, "SRE")
|
||||
f.close()
|
||||
print "done"
|
||||
|
|
|
|||
630
Modules/_sre.c
630
Modules/_sre.c
File diff suppressed because it is too large
Load Diff
|
|
@ -14,17 +14,18 @@
|
|||
|
||||
#include "sre_constants.h"
|
||||
|
||||
/* Python objects */
|
||||
|
||||
typedef struct {
|
||||
PyObject_HEAD
|
||||
PyObject* code; /* link to the code string object */
|
||||
PyObject* pattern; /* link to the pattern source (or None) */
|
||||
int groups;
|
||||
PyObject* groupindex;
|
||||
/* compatibility */
|
||||
PyObject* pattern; /* pattern source (or None) */
|
||||
int flags; /* flags used when compiling pattern source */
|
||||
} PatternObject;
|
||||
|
||||
#define PatternObject_GetCode(o) ((void*) PyString_AS_STRING((o)->code))
|
||||
#define PatternObject_GetCode(o)\
|
||||
((void*) PyString_AS_STRING(((PatternObject*)(o))->code))
|
||||
|
||||
typedef struct {
|
||||
PyObject_HEAD
|
||||
|
|
@ -34,5 +35,28 @@ typedef struct {
|
|||
int mark[2];
|
||||
} MatchObject;
|
||||
|
||||
#endif
|
||||
typedef struct {
|
||||
/* string pointers */
|
||||
void* ptr; /* current position (also end of current slice) */
|
||||
void* beginning; /* start of original string */
|
||||
void* start; /* start of current slice */
|
||||
void* end; /* end of original string */
|
||||
/* character size */
|
||||
int charsize;
|
||||
/* registers */
|
||||
int marks;
|
||||
void* mark[64]; /* FIXME: <fl> should be dynamically allocated! */
|
||||
/* backtracking stack */
|
||||
void** stack;
|
||||
int stacksize;
|
||||
int stackbase;
|
||||
} SRE_STATE;
|
||||
|
||||
typedef struct {
|
||||
PyObject_HEAD
|
||||
PyObject* pattern;
|
||||
PyObject* string;
|
||||
SRE_STATE state;
|
||||
} CursorObject;
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
/* generated by sre_constants.py */
|
||||
/* generated from sre_constants.py */
|
||||
#define SRE_OP_FAILURE 0
|
||||
#define SRE_OP_SUCCESS 1
|
||||
#define SRE_OP_ANY 2
|
||||
|
|
@ -25,3 +25,25 @@
|
|||
#define SRE_OP_NEGATE 23
|
||||
#define SRE_OP_RANGE 24
|
||||
#define SRE_OP_REPEAT 25
|
||||
#define SRE_AT_BEGINNING 0
|
||||
#define SRE_AT_BEGINNING_LINE 1
|
||||
#define SRE_AT_BOUNDARY 2
|
||||
#define SRE_AT_NON_BOUNDARY 3
|
||||
#define SRE_AT_END 4
|
||||
#define SRE_AT_END_LINE 5
|
||||
#define SRE_CATEGORY_DIGIT 0
|
||||
#define SRE_CATEGORY_NOT_DIGIT 1
|
||||
#define SRE_CATEGORY_SPACE 2
|
||||
#define SRE_CATEGORY_NOT_SPACE 3
|
||||
#define SRE_CATEGORY_WORD 4
|
||||
#define SRE_CATEGORY_NOT_WORD 5
|
||||
#define SRE_CATEGORY_LINEBREAK 6
|
||||
#define SRE_CATEGORY_NOT_LINEBREAK 7
|
||||
#define SRE_CATEGORY_LOC_DIGIT 8
|
||||
#define SRE_CATEGORY_LOC_NOT_DIGIT 9
|
||||
#define SRE_CATEGORY_LOC_SPACE 10
|
||||
#define SRE_CATEGORY_LOC_NOT_SPACE 11
|
||||
#define SRE_CATEGORY_LOC_WORD 12
|
||||
#define SRE_CATEGORY_LOC_NOT_WORD 13
|
||||
#define SRE_CATEGORY_LOC_LINEBREAK 14
|
||||
#define SRE_CATEGORY_LOC_NOT_LINEBREAK 15
|
||||
|
|
|
|||
Loading…
Reference in New Issue