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Regex: make RegexIterator iterable and able to iter backwards

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This commit is contained in:
Maxime Coste 2017-12-02 14:02:41 +08:00
parent 413f880e9e
commit b34bb6b794
1 changed files with 26 additions and 10 deletions
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36
src/regex.hh
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@ -139,7 +139,7 @@ bool regex_search(It begin, It end, MatchResults<It>& res, const Regex& re,
String option_to_string(const Regex& re);
void option_from_string(StringView str, Regex& re);
template<typename Iterator>
template<typename Iterator, MatchDirection direction = MatchDirection::Forward>
struct RegexIterator
{
using ValueType = MatchResults<Iterator>;
@ -147,7 +147,8 @@ struct RegexIterator
RegexIterator() = default;
RegexIterator(Iterator begin, Iterator end, const Regex& re,
RegexExecFlags flags = RegexExecFlags::None)
: m_regex{&re}, m_next_begin{begin}, m_begin{begin}, m_end{end}, m_flags{flags}
: m_regex{&re}, m_next_pos{direction == MatchDirection::Forward ? begin : end},
m_begin{begin}, m_end{end}, m_flags{flags}
{
next();
}
@ -167,7 +168,7 @@ struct RegexIterator
return true;
return lhs.m_regex == rhs.m_regex and
lhs.m_next_begin == rhs.m_next_begin and
lhs.m_next_pos == rhs.m_next_pos and
lhs.m_end == rhs.m_end and
lhs.m_flags == rhs.m_flags and
lhs.m_results == rhs.m_results;
@ -178,6 +179,9 @@ struct RegexIterator
return not (lhs == rhs);
}
RegexIterator begin() { return *this; }
RegexIterator end() { return {}; }
private:
void next()
{
@ -186,19 +190,31 @@ private:
RegexExecFlags additional_flags{};
if (m_results.size() and m_results[0].first == m_results[0].second)
additional_flags |= RegexExecFlags::NotInitialNull;
if (m_begin != m_next_begin)
additional_flags |= RegexExecFlags::NotBeginOfSubject | RegexExecFlags::PrevAvailable;
if (not regex_search(m_next_begin, m_end, m_results, *m_regex,
m_flags | additional_flags))
m_regex = nullptr;
if (direction == MatchDirection::Forward)
{
if (m_begin != m_next_pos)
additional_flags |= RegexExecFlags::NotBeginOfSubject | RegexExecFlags::PrevAvailable;
if (not regex_search(m_next_pos, m_end, m_results, *m_regex,
m_flags | additional_flags))
m_regex = nullptr;
else
m_next_pos = m_results[0].second;
}
else
m_next_begin = m_results[0].second;
{
if (not regex_search<Iterator, MatchDirection::Backward>(m_begin, m_next_pos, m_results, *m_regex,
m_flags | additional_flags))
m_regex = nullptr;
else
m_next_pos = m_results[0].first;
}
}
const Regex* m_regex = nullptr;
MatchResults<Iterator> m_results;
Iterator m_next_begin{};
Iterator m_next_pos{};
const Iterator m_begin{};
const Iterator m_end{};
const RegexExecFlags m_flags = RegexExecFlags::None;