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Regex: Fix handling of match_prev_avail for boost regex

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We were passing around iterators that were not allowed to
go before the begin iterator.
This commit is contained in:
Maxime Coste 2017-10-08 11:16:03 +08:00
parent 9ec376135b
commit 08ea68dc1f
1 changed files with 4 additions and 2 deletions
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6
src/regex.hh
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@ -180,7 +180,8 @@ bool regex_search(It begin, It end, const Regex& re,
{
try
{
bool matched = boost::regex_search<RegexUtf8It<It>>({begin, begin, end}, {end, begin, end}, re, flags);
auto first = (flags & RegexConstant::match_prev_avail) ? begin-1 : begin;
bool matched = boost::regex_search<RegexUtf8It<It>>({begin, first, end}, {end, first, end}, re, flags);
if (re.impl() and matched != regex_search(begin, end, *re.impl(), convert_flags(flags)))
regex_mismatch(re);
return matched;
@ -197,7 +198,8 @@ bool regex_search(It begin, It end, MatchResults<It>& res, const Regex& re,
{
try
{
bool matched = boost::regex_search<RegexUtf8It<It>>({begin, begin, end}, {end, begin, end}, res, re, flags);
auto first = (flags & RegexConstant::match_prev_avail) ? begin-1 : begin;
bool matched = boost::regex_search<RegexUtf8It<It>>({begin, first, end}, {end, first, end}, res, re, flags);
Vector<It> captures;
if (re.impl() and matched != regex_search(begin, end, captures, *re.impl(), convert_flags(flags)))
regex_mismatch(re);