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#ifndef highlighter_hh_INCLUDED
#define highlighter_hh_INCLUDED
#include "function_registry.hh"
#include "memoryview.hh"
#include "string.hh"
#include "utils.hh"
#include <functional>
namespace Kakoune
{
class DisplayBuffer;
class Context;
enum class HighlightFlags
{
Highlight,
MoveOnly
};
// An Highlighter is a function which mutates a DisplayBuffer in order to
// change the visual representation of a file. It could be changing text
// color, adding information text (line numbering for example) or replacing
// buffer content (folding for example)
struct Highlighter;
using HighlighterAndId = std::pair<String, std::unique_ptr<Highlighter>>;
struct Highlighter
{
virtual ~Highlighter() {}
virtual void highlight(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer) = 0;
virtual bool has_children() const { return false; }
virtual Highlighter& get_child(StringView path) { throw runtime_error("this highlighter do not hold children"); }
virtual void add_child(HighlighterAndId&& hl) { throw runtime_error("this highlighter do not hold children"); }
virtual void remove_child(StringView id) { throw runtime_error("this highlighter do not hold children"); }
virtual Completions complete_child(StringView path, ByteCount cursor_pos, bool group) const { throw runtime_error("this highlighter do not hold children"); }
};
template<typename Func>
struct SimpleHighlighter : public Highlighter
{
SimpleHighlighter(Func func) : m_func(std::move(func)) {}
virtual void highlight(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer) override
{
m_func(context, flags, display_buffer);
}
private:
Func m_func;
};
template<typename T>
std::unique_ptr<SimpleHighlighter<T>> make_simple_highlighter(T func)
{
return make_unique<SimpleHighlighter<T>>(std::move(func));
}
using HighlighterParameters = memoryview<String>;
using HighlighterFactory = std::function<HighlighterAndId (HighlighterParameters params)>;
struct HighlighterRegistry : FunctionRegistry<HighlighterFactory>,
Singleton<HighlighterRegistry>
{};
}
#endif // highlighter_hh_INCLUDED
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