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Added support for forward lookahead asserts.

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[SVN r12455]
This commit is contained in:
John Maddock
2002-01-23 12:42:31 +00:00
parent e993619390
commit c07c4e0a11
7 changed files with 124 additions and 23 deletions
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33
include/boost/regex/detail/regex_compile.hpp
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@ -444,6 +444,12 @@ bool BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::probe_start(
switch(node->type)
{
case re_detail::syntax_element_startmark:
if(static_cast<const re_detail::re_brace*>(node)->index == -1)
{
return probe_start(node->next.p->next.p, cc, terminal)
&& probe_start(static_cast<const re_detail::re_jump*>(node->next.p)->alt.p, cc, terminal);
}
// fall through:
case re_detail::syntax_element_endmark:
case re_detail::syntax_element_start_line:
case re_detail::syntax_element_word_boundary:
@ -1207,7 +1213,8 @@ void BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::fixup_apply(re_d
}
goto rebase;
case re_detail::syntax_element_endmark:
pb[((re_detail::re_brace*)ptr)->index] = true;
if(((re_detail::re_brace*)ptr)->index > 0)
pb[((re_detail::re_brace*)ptr)->index] = true;
goto rebase;
default:
rebase:
@ -1261,7 +1268,7 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::set_expr
const charT* ptr = p;
marks = 0;
re_detail::jstack<unsigned int, Allocator> mark(64, data.allocator());
re_detail::jstack<unsigned int, Allocator> markid(64, data.allocator());
re_detail::jstack<int, Allocator> markid(64, data.allocator());
unsigned int last_mark_popped = 0;
register traits_size_type c;
register re_detail::re_syntax_base* dat;
@ -1325,6 +1332,28 @@ unsigned int BOOST_REGEX_CALL reg_expression<charT, traits, Allocator>::set_expr
markid.push(0);
++ptr;
continue;
case traits_type::syntax_equal:
((re_detail::re_brace*)dat)->index = -1;
markid.pop();
markid.push(-1);
common_forward_assert:
--marks;
++ptr;
// extend:
dat = add_simple(dat, re_detail::syntax_element_jump, re_detail::re_jump_size);
data.align();
//
// we don't know what value to put here yet,
// use an arbitrarily large value for now
// and check it later:
((re_detail::re_jump*)dat)->alt.i = INT_MAX/2;
mark.push(data.size() - re_detail::re_jump_size);
continue;
case traits_type::syntax_not:
((re_detail::re_brace*)dat)->index = -2;
markid.pop();
markid.push(-2);
goto common_forward_assert;
case traits_type::syntax_hash:
// comment just skip it:
((re_detail::re_brace*)dat)->index = 0;