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Don't optimise leading repeats when there are backreferences involved.

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[SVN r22705]
This commit is contained in:
John Maddock
2004-04-25 10:32:09 +00:00
parent a262f28327
commit 76176b302b
1 changed files with 3 additions and 1 deletions
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4
include/boost/regex/v4/regex_compile.hpp
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@ -1350,6 +1350,7 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::set_expr
data.clear();
_flags = f;
fail(REG_NOERROR); // clear any error
_leading_len = 0; // set this to non-zero if there are any backrefs, we'll refer to it later...
if(arg_first >= arg_last)
{
@ -1600,6 +1601,7 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::set_expr
dat = add_simple(dat, re_detail::syntax_element_backref, sizeof(re_detail::re_brace));
static_cast<re_detail::re_brace*>(dat)->index = i;
++ptr;
_leading_len = 1;
continue;
}
break;
@ -2141,7 +2143,7 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::fixup_le
case re_detail::syntax_element_char_rep:
case re_detail::syntax_element_short_set_rep:
case re_detail::syntax_element_long_set_rep:
if((len == 0) && (1 == fixup_leading_rep(dat->next.p, static_cast<re_detail::re_repeat*>(dat)->alt.p) ))
if((len == 0) && (_leading_len == 0) && (1 == fixup_leading_rep(dat->next.p, static_cast<re_detail::re_repeat*>(dat)->alt.p) ))
{
static_cast<re_detail::re_repeat*>(dat)->leading = leading_lit;
return len;