/[pcre]/code/trunk/pcre_compile.c
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revision 749 by ph10, Fri Nov 18 10:36:45 2011 UTC revision 750 by ph10, Fri Nov 18 11:07:14 2011 UTC
# Line 4994  for (;; ptr++) Line 4994  for (;; ptr++)
4994        KETRPOS. (It turns out to be convenient at runtime to detect this kind of        KETRPOS. (It turns out to be convenient at runtime to detect this kind of
4995        subpattern at both the start and at the end.) The use of special opcodes        subpattern at both the start and at the end.) The use of special opcodes
4996        makes it possible to reduce greatly the stack usage in pcre_exec(). If        makes it possible to reduce greatly the stack usage in pcre_exec(). If
4997        the group is preceded by OP_BRAZERO, convert this to OP_BRAPOSZERO. Then        the group is preceded by OP_BRAZERO, convert this to OP_BRAPOSZERO.
4998        cancel the possessive flag so that the default action below, of wrapping  
4999        everything inside atomic brackets, does not happen. */        Then, if the minimum number of matches is 1 or 0, cancel the possessive
5000          flag so that the default action below, of wrapping everything inside
5001          atomic brackets, does not happen. When the minimum is greater than 1,
5002          there will be earlier copies of the group, and so we still have to wrap
5003          the whole thing. */
5004    
5005        else        else
5006          {          {
# Line 5068  for (;; ptr++) Line 5072  for (;; ptr++)
5072                }                }
5073    
5074              /* If the minimum is zero, mark it as possessive, then unset the              /* If the minimum is zero, mark it as possessive, then unset the
5075              possessive flag. */              possessive flag when the minimum is 0 or 1. */
5076    
5077              if (brazeroptr != NULL) *brazeroptr = OP_BRAPOSZERO;              if (brazeroptr != NULL) *brazeroptr = OP_BRAPOSZERO;
5078              possessive_quantifier = FALSE;              if (repeat_min < 2) possessive_quantifier = FALSE;
5079              }              }
5080    
5081            /* Non-possessive quantifier */            /* Non-possessive quantifier */
# Line 5103  for (;; ptr++) Line 5107  for (;; ptr++)
5107      notation is just syntactic sugar, taken from Sun's Java package, but the      notation is just syntactic sugar, taken from Sun's Java package, but the
5108      special opcodes can optimize it.      special opcodes can optimize it.
5109    
5110      Possessively repeated subpatterns have already been handled in the code      Some (but not all) possessively repeated subpatterns have already been
5111      just above, so possessive_quantifier is always FALSE for them at this      completely handled in the code just above. For them, possessive_quantifier
5112      stage.      is always FALSE at this stage.
5113    
5114      Note that the repeated item starts at tempcode, not at previous, which      Note that the repeated item starts at tempcode, not at previous, which
5115      might be the first part of a string whose (former) last char we repeated.      might be the first part of a string whose (former) last char we repeated.
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