SRE 0.9.8: passes the entire test suite

-- reverted REPEAT operator to use "repeat context" strategy
   (from 0.8.X), but done right this time.
-- got rid of backtracking stack; use nested SRE_MATCH calls
   instead (should probably put it back again in 0.9.9 ;-)
-- properly reset state in scanner mode
-- don't use aggressive inlining by default

Author: Fredrik Lundh

Lib/sre.py

@@ -5,8 +5,12 @@
 #
 # Copyright (c) 1998-2000 by Secret Labs AB.  All rights reserved.
 #
+# This version of the SRE library can be redistributed under CNRI's
+# Python 1.6 license.  For any other use, please contact Secret Labs
+# AB ([email protected]).
+#
 # Portions of this engine have been developed in cooperation with
-# CNRI.  Hewlett-Packard provided funding for 2.0 integration and
+# CNRI.  Hewlett-Packard provided funding for 1.6 integration and
 # other compatibility work.
 #
 
@@ -24,7 +28,7 @@
 S = DOTALL = sre_compile.SRE_FLAG_DOTALL
 X = VERBOSE = sre_compile.SRE_FLAG_VERBOSE
 
-# sre extensions (may or may not be in 2.0 final)
+# sre extensions (may or may not be in 1.6/2.0 final)
 T = TEMPLATE = sre_compile.SRE_FLAG_TEMPLATE
 U = UNICODE = sre_compile.SRE_FLAG_UNICODE
 
@@ -168,15 +172,14 @@ def _pickle(p):
 
 class Scanner:
     def __init__(self, lexicon):
-        from sre_constants import BRANCH, SUBPATTERN, INDEX
+        from sre_constants import BRANCH, SUBPATTERN
         self.lexicon = lexicon
         # combine phrases into a compound pattern
         p = []
         s = sre_parse.Pattern()
         for phrase, action in lexicon:
             p.append(sre_parse.SubPattern(s, [
-                (SUBPATTERN, (None, sre_parse.parse(phrase))),
-                (INDEX, len(p))
+                (SUBPATTERN, (len(p), sre_parse.parse(phrase))),
                 ]))
         p = sre_parse.SubPattern(s, [(BRANCH, (None, p))])
         s.groups = len(p)

Lib/sre_compile.py

@@ -5,9 +5,7 @@
 #
 # Copyright (c) 1997-2000 by Secret Labs AB.  All rights reserved.
 #
-# Portions of this engine have been developed in cooperation with
-# CNRI.  Hewlett-Packard provided funding for 2.0 integration and
-# other compatibility work.
+# See the sre.py file for information on usage and redistribution.
 #
 
 import _sre
@@ -124,6 +122,7 @@ def fixup(literal, flags=flags):
                 emit(CHCODES[CATEGORY_NOT_LINEBREAK])
         elif op in (REPEAT, MIN_REPEAT, MAX_REPEAT):
             if flags & SRE_FLAG_TEMPLATE:
+                raise error, "internal: unsupported template operator"
                 emit(OPCODES[REPEAT])
                 skip = len(code); emit(0)
                 emit(av[0])
@@ -136,39 +135,33 @@ def fixup(literal, flags=flags):
                 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])
+                    # 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
                 else:
-                    emit(OPCODES[op])
+                    emit(OPCODES[REPEAT])
                     skip = len(code); emit(0)
                     emit(av[0])
                     emit(av[1])
-                    mark = MAXCODE
-                    if av[2][0][0] == SUBPATTERN:
-                        # repeated subpattern
-                        gid, foo = av[2][0][1]
-                        if gid:
-                            mark = (gid-1)*2
-                    emit(mark)
                     _compile(code, av[2], flags)
-                    emit(OPCODES[SUCCESS])
                     code[skip] = len(code) - skip
+                    if op == MAX_REPEAT:
+                        emit(OPCODES[MAX_UNTIL])
+                    else:
+                        emit(OPCODES[MIN_UNTIL])
         elif op is SUBPATTERN:
-            gid = av[0]
-            if gid:
+            if av[0]:
                 emit(OPCODES[MARK])
-                emit((gid-1)*2)
+                emit((av[0]-1)*2)
             _compile(code, av[1], flags)
-            if gid:
+            if av[0]:
                 emit(OPCODES[MARK])
-                emit((gid-1)*2+1)
+                emit((av[0]-1)*2+1)
         elif op in (SUCCESS, FAILURE):
             emit(OPCODES[op])
         elif op in (ASSERT, ASSERT_NOT):
@@ -197,11 +190,10 @@ def fixup(literal, flags=flags):
             else:
                 emit(ATCODES[av])
         elif op is BRANCH:
+            emit(OPCODES[op])
             tail = []
             for av in av[1]:
-                emit(OPCODES[op])
                 skip = len(code); emit(0)
-                emit(MAXCODE) # save mark
                 _compile(code, av, flags)
                 emit(OPCODES[JUMP])
                 tail.append(len(code)); emit(0)
@@ -223,9 +215,6 @@ def fixup(literal, flags=flags):
             else:
                 emit(OPCODES[op])
             emit(av-1)
-        elif op in (MARK, INDEX):
-            emit(OPCODES[op])
-            emit(av)
         else:
             raise ValueError, ("unsupported operand type", op)
 
@@ -294,16 +283,7 @@ def _compile_info(code, pattern, flags):
 except NameError:
     pass
 
-def compile(p, flags=0):
-    # internal: convert pattern list to internal format
-
-    # compile, as necessary
-    if type(p) in STRING_TYPES:
-        import sre_parse
-        pattern = p
-        p = sre_parse.parse(p, flags)
-    else:
-        pattern = None
+def _compile1(p, flags):
 
     flags = p.pattern.flags | flags
     code = []
@@ -316,6 +296,20 @@ def compile(p, flags=0):
 
     code.append(OPCODES[SUCCESS])
 
+    return code
+
+def compile(p, flags=0):
+    # internal: convert pattern list to internal format
+
+    if type(p) in STRING_TYPES:
+        import sre_parse
+        pattern = p
+        p = sre_parse.parse(p, flags)
+    else:
+        pattern = None
+
+    code = _compile1(p, flags)
+
     # print code
 
     # FIXME: <fl> get rid of this limitation!

Lib/sre_constants.py

@@ -6,9 +6,7 @@
 #
 # Copyright (c) 1998-2000 by Secret Labs AB.  All rights reserved.
 #
-# Portions of this engine have been developed in cooperation with
-# CNRI.  Hewlett-Packard provided funding for 2.0 integration and
-# other compatibility work.
+# See the sre.py file for information on usage and redistribution.
 #
 
 # should this really be here?
@@ -33,15 +31,15 @@ class error(Exception):
 GROUPREF_IGNORE = "groupref_ignore"
 IN = "in"
 IN_IGNORE = "in_ignore"
-INDEX = "index"
 INFO = "info"
 JUMP = "jump"
 LITERAL = "literal"
 LITERAL_IGNORE = "literal_ignore"
 MARK = "mark"
 MAX_REPEAT = "max_repeat"
-MAX_REPEAT_ONE = "max_repeat_one"
+MAX_UNTIL = "max_until"
 MIN_REPEAT = "min_repeat"
+MIN_UNTIL = "min_until"
 NEGATE = "negate"
 NOT_LITERAL = "not_literal"
 NOT_LITERAL_IGNORE = "not_literal_ignore"
@@ -91,19 +89,19 @@ class error(Exception):
     CATEGORY,
     CHARSET,
     GROUPREF, GROUPREF_IGNORE,
-    INDEX,
     IN, IN_IGNORE,
     INFO,
     JUMP,
     LITERAL, LITERAL_IGNORE,
     MARK,
-    MAX_REPEAT,
-    MAX_REPEAT_ONE,
-    MIN_REPEAT,
+    MAX_UNTIL,
+    MIN_UNTIL,
     NOT_LITERAL, NOT_LITERAL_IGNORE,
     NEGATE,
     RANGE,
-    REPEAT
+    REPEAT,
+    REPEAT_ONE,
+    SUBPATTERN
 
 ]
 

Lib/sre_parse.py

@@ -5,9 +5,7 @@
 #
 # Copyright (c) 1998-2000 by Secret Labs AB.  All rights reserved.
 #
-# Portions of this engine have been developed in cooperation with
-# CNRI.  Hewlett-Packard provided funding for 2.0 integration and
-# other compatibility work.
+# See the sre.py file for information on usage and redistribution.
 #
 
 import string, sys
@@ -536,8 +534,6 @@ def _parse(source, state):
                     group = state.getgroup(name)
                 p = _parse_sub(source, state)
                 subpattern.append((SUBPATTERN, (group, p)))
-                if group is not None:
-                    p.append((INDEX, group))
             else:
                 while 1:
                     char = source.get()