kakoune/src/keys.cc

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#include "keys.hh"
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#include "containers.hh"
#include "exception.hh"
#include "string.hh"
#include "unit_tests.hh"
#include "utf8_iterator.hh"
#include "utils.hh"
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namespace Kakoune
{
static Key canonicalize_ifn(Key key)
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{
if (key.key > 0 and key.key < 27)
{
kak_assert(key.modifiers == Key::Modifiers::None);
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key.modifiers = Key::Modifiers::Control;
key.key = key.key - 1 + 'a';
}
return key;
}
Optional<Codepoint> Key::codepoint() const
{
if (*this == Key::Return)
return '\n';
if (*this == Key::Tab)
return '\t';
if (*this == Key::Escape)
return 0x1B;
if (modifiers == Modifiers::None and key > 27 and
(key < 0xD800 or key > 0xDFFF)) // avoid surrogates
return key;
return {};
}
struct KeyAndName { const char* name; Codepoint key; };
static constexpr KeyAndName keynamemap[] = {
{ "ret", Key::Return },
{ "space", ' ' },
{ "tab", Key::Tab },
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{ "lt", '<' },
{ "gt", '>' },
{ "backspace", Key::Backspace},
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{ "esc", Key::Escape },
{ "up", Key::Up },
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{ "down", Key::Down},
{ "left", Key::Left },
{ "right", Key::Right },
{ "pageup", Key::PageUp },
{ "pagedown", Key::PageDown },
{ "home", Key::Home },
{ "end", Key::End },
{ "backtab", Key::BackTab },
{ "del", Key::Delete },
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};
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KeyList parse_keys(StringView str)
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{
KeyList result;
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using Utf8It = utf8::iterator<const char*>;
for (Utf8It it{str.begin(), str}, str_end{str.end(), str}; it < str_end; ++it)
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{
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if (*it != '<')
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{
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result.push_back({Key::Modifiers::None, *it});
continue;
}
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Utf8It end_it = std::find(it, str_end, '>');
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if (end_it == str_end)
{
result.push_back({Key::Modifiers::None, *it});
continue;
}
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Key::Modifiers modifier = Key::Modifiers::None;
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StringView desc{it.base()+1, end_it.base()};
if (desc.length() > 2 and desc[1_byte] == '-')
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{
switch(to_lower(desc[0_byte]))
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{
case 'c': modifier = Key::Modifiers::Control; break;
case 'a': modifier = Key::Modifiers::Alt; break;
default:
throw runtime_error("unable to parse modifier in " +
StringView{it.base(), end_it.base()+1});
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}
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desc = desc.substr(2_byte);
}
auto name_it = find_if(keynamemap, [&desc](const KeyAndName& item)
{ return item.name == desc; });
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if (name_it != end(keynamemap))
result.push_back(canonicalize_ifn({ modifier, name_it->key }));
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else if (desc.char_length() == 1)
result.push_back(Key{ modifier, desc[0_char] });
else if (to_lower(desc[0_byte]) == 'f' and desc.length() <= 3)
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{
int val = str_to_int(desc.substr(1_byte));
if (val >= 1 and val <= 12)
result.push_back(Key{ modifier, Key::F1 + (val - 1) });
else
throw runtime_error("Only F1 through F12 are supported");
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}
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else
throw runtime_error("Failed to parse " +
StringView{it.base(), end_it.base()+1});
it = end_it;
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}
return result;
}
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String key_to_str(Key key)
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{
if (auto mouse_event = (key.modifiers & Key::Modifiers::MouseEvent))
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{
const auto coord = key.coord() + DisplayCoord{1,1};
switch ((Key::Modifiers)mouse_event)
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{
case Key::Modifiers::MousePos:
return format("<mouse:move:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MousePress:
return format("<mouse:press:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MouseRelease:
return format("<mouse:release:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MouseWheelDown:
return "<mouse:wheel_down>";
case Key::Modifiers::MouseWheelUp:
return "<mouse:wheel_up>";
default: kak_assert(false);
}
}
else if (key.modifiers == Key::Modifiers::Resize)
{
auto size = key.coord() + DisplayCoord{1,1};
return format("<resize:{}.{}>", size.line, size.column);
}
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bool named = false;
String res;
auto it = find_if(keynamemap, [&key](const KeyAndName& item)
{ return item.key == key.key; });
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if (it != end(keynamemap))
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{
named = true;
res = it->name;
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}
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else if (key.key >= Key::F1 and key.key < Key::F12)
{
named = true;
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res = "F" + to_string((int)(key.key - Key::F1 + 1));
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}
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else
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res = String{key.key};
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switch (key.modifiers)
{
case Key::Modifiers::Control: res = "c-" + res; named = true; break;
case Key::Modifiers::Alt: res = "a-" + res; named = true; break;
default: break;
}
if (named)
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res = StringView{'<'} + res + StringView{'>'};
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return res;
}
UnitTest test_keys{[]()
{
KeyList keys{
{ ' ' },
{ 'c' },
{ Key::Modifiers::Alt, 'j' },
{ Key::Modifiers::Control, 'r' }
};
String keys_as_str;
for (auto& key : keys)
keys_as_str += key_to_str(key);
auto parsed_keys = parse_keys(keys_as_str);
kak_assert(keys == parsed_keys);
}};
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}