/[pcre]/code/trunk/pcre_study.c
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revision 461 by ph10, Mon Oct 5 10:59:35 2009 UTC revision 467 by ph10, Mon Oct 19 11:43:18 2009 UTC
# Line 314  for (;;) Line 314  for (;;)
314      logic is that a recursion can only make sense if there is another      logic is that a recursion can only make sense if there is another
315      alternation that stops the recursing. That will provide the minimum length      alternation that stops the recursing. That will provide the minimum length
316      (when no recursion happens). A backreference within the group that it is      (when no recursion happens). A backreference within the group that it is
317      referencing behaves in the same way. */      referencing behaves in the same way.
318    
319        If PCRE_JAVASCRIPT_COMPAT is set, a backreference to an unset bracket
320        matches an empty string (by default it causes a matching failure), so in
321        that case we must set the minimum length to zero. */
322    
323      case OP_REF:      case OP_REF:
324      ce = cs = (uschar *)_pcre_find_bracket(startcode, utf8, GET2(cc, 1));      if ((options & PCRE_JAVASCRIPT_COMPAT) == 0)
325      if (cs == NULL) return -2;        {
326      do ce += GET(ce, 1); while (*ce == OP_ALT);        ce = cs = (uschar *)_pcre_find_bracket(startcode, utf8, GET2(cc, 1));
327      if (cc > cs && cc < ce)        if (cs == NULL) return -2;
328        {        do ce += GET(ce, 1); while (*ce == OP_ALT);
329        d = 0;        if (cc > cs && cc < ce)
330        had_recurse = TRUE;          {
331            d = 0;
332            had_recurse = TRUE;
333            }
334          else d = find_minlength(cs, startcode, options);
335        }        }
336      else d = find_minlength(cs, startcode, options);      else d = 0;
337      cc += 3;      cc += 3;
338    
339      /* Handle repeated back references */      /* Handle repeated back references */
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