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#ifndef completion_hh_INCLUDED
#define completion_hh_INCLUDED
#include <functional>
#include "units.hh"
#include "string.hh"
#include "vector.hh"
namespace Kakoune
{
class Context;
using CandidateList = Vector<String>;
struct Completions
{
CandidateList candidates;
ByteCount start;
ByteCount end;
Completions()
: start(0), end(0) {}
Completions(ByteCount start, ByteCount end)
: start(start), end(end) {}
Completions(ByteCount start, ByteCount end, CandidateList candidates)
: start(start), end(end), candidates(std::move(candidates)) {}
};
enum class CompletionFlags
{
None,
Fast
};
using Completer = std::function<Completions (const Context&, CompletionFlags,
StringView, ByteCount)>;
inline Completions complete_nothing(const Context& context, CompletionFlags,
StringView, ByteCount cursor_pos)
{
return Completions(cursor_pos, cursor_pos);
}
Completions shell_complete(const Context& context, CompletionFlags,
StringView, ByteCount cursor_pos);
inline Completions offset_pos(Completions completion, ByteCount offset)
{
return { completion.start + offset, completion.end + offset,
std::move(completion.candidates) };
}
namespace detail
{
template<typename Str, typename Func>
void do_matches(Str&& str, StringView prefix,
CandidateList* res, Func match_func)
{
if (match_func(str, prefix))
res->push_back(str);
}
template<typename Str, typename Func, typename... Rest>
void do_matches(Str&& str, StringView prefix,
CandidateList* res, Func match_func, Rest... rest)
{
do_matches(str, prefix, res, match_func);
do_matches(str, prefix, res+1, rest...);
}
}
template<typename Container, typename... MatchFunc>
CandidateList complete(StringView prefix, ByteCount cursor_pos,
const Container& container, MatchFunc... match_func)
{
CandidateList res[sizeof...(match_func)];
auto real_prefix = prefix.substr(0, cursor_pos);
for (const auto& elem : container)
detail::do_matches(elem, real_prefix, res, match_func...);
auto it = find_if(res, [](CandidateList& c) { return not c.empty(); });
return it == end(res) ? CandidateList{} : std::move(*it);
}
template<typename Container>
CandidateList complete(StringView prefix, ByteCount cursor_pos,
const Container& container)
{
return complete(prefix, cursor_pos, container, prefix_match);
}
}
#endif // completion_hh_INCLUDED
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