home/src/keys.cc
2019-09-08 22:54:41 +10:00

236 lines
7.7 KiB
C++

#include "keys.hh"
#include "exception.hh"
#include "ranges.hh"
#include "string.hh"
#include "unit_tests.hh"
#include "utf8_iterator.hh"
#include "utils.hh"
#include "string_utils.hh"
namespace Kakoune
{
struct key_parse_error : runtime_error
{
using runtime_error::runtime_error;
};
static Key canonicalize_ifn(Key key)
{
if (key.key > 0 and key.key < 27)
{
kak_assert(key.modifiers == Key::Modifiers::None);
key.modifiers = Key::Modifiers::Control;
key.key = key.key - 1 + 'a';
}
if (key.modifiers & Key::Modifiers::Shift)
{
if (is_basic_alpha(key.key))
{
// Shift + ASCII letters is just the uppercase letter.
key.modifiers &= ~Key::Modifiers::Shift;
key.key = to_upper(key.key);
}
else if (key.key < 0xD800 || key.key > 0xDFFF)
{
// Shift + any other printable character is not allowed.
throw key_parse_error(format("Shift modifier only works on special keys and lowercase ASCII, not '{}'", key.key));
}
}
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 },
{ "lt", '<' },
{ "gt", '>' },
{ "backspace", Key::Backspace},
{ "esc", Key::Escape },
{ "up", Key::Up },
{ "down", Key::Down},
{ "left", Key::Left },
{ "right", Key::Right },
{ "pageup", Key::PageUp },
{ "pagedown", Key::PageDown },
{ "home", Key::Home },
{ "end", Key::End },
{ "ins", Key::Insert },
{ "del", Key::Delete },
{ "plus", '+' },
{ "minus", '-' },
};
KeyList parse_keys(StringView str)
{
KeyList result;
using Utf8It = utf8::iterator<const char*>;
for (Utf8It it{str.begin(), str}, str_end{str.end(), str}; it < str_end; ++it)
{
if (*it != '<')
{
result.emplace_back(Key::Modifiers::None, *it);
continue;
}
Utf8It end_it = std::find(it, str_end, '>');
if (end_it == str_end)
{
result.emplace_back(Key::Modifiers::None, *it);
continue;
}
Key::Modifiers modifier = Key::Modifiers::None;
StringView full_desc{it.base(), end_it.base()+1};
StringView desc{it.base()+1, end_it.base()};
for (auto dash = find(desc, '-'); dash != desc.end(); dash = find(desc, '-'))
{
if (dash != desc.begin() + 1)
throw key_parse_error(format("unable to parse modifier in '{}'",
full_desc));
switch(to_lower(desc[0_byte]))
{
case 'c': modifier |= Key::Modifiers::Control; break;
case 'a': modifier |= Key::Modifiers::Alt; break;
case 's': modifier |= Key::Modifiers::Shift; break;
default:
throw key_parse_error(format("unable to parse modifier in '{}'",
full_desc));
}
desc = StringView{dash+1, desc.end()};
}
auto name_it = find_if(keynamemap, [&desc](const KeyAndName& item)
{ return item.name == desc; });
if (name_it != std::end(keynamemap))
result.push_back(canonicalize_ifn({ modifier, name_it->key }));
else if (desc.char_length() == 1)
result.push_back(canonicalize_ifn({ modifier, desc[0_char] }));
else if (desc[0_byte] == 'F' and desc.length() <= 3)
{
int val = str_to_int(desc.substr(1_byte));
if (val >= 1 and val <= 12)
result.emplace_back(modifier, Key::F1 + (val - 1));
else
throw key_parse_error(format("only F1 through F12 are supported, not '{}'", desc));
}
else
throw key_parse_error("unable to parse " +
StringView{it.base(), end_it.base()+1});
it = end_it;
}
return result;
}
String key_to_str(Key key)
{
const auto coord = key.coord() + DisplayCoord{1,1};
switch (key.modifiers)
{
case Key::Modifiers::MousePos:
return format("<mouse:move:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MousePressLeft:
return format("<mouse:press_left:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MousePressRight:
return format("<mouse:press_right:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MouseReleaseLeft:
return format("<mouse:release_left:{}.{}>", coord.line, coord.column);
case Key::Modifiers::MouseReleaseRight:
return format("<mouse:release_right:{}.{}>", coord.line, coord.column);
case Key::Modifiers::Scroll:
return format("<scroll:{}>", static_cast<int>(key.key));
case Key::Modifiers::Resize:
return format("<resize:{}.{}>", coord.line, coord.column);
default: break;
}
bool named = false;
String res;
auto it = find_if(keynamemap, [&key](const KeyAndName& item)
{ return item.key == key.key; });
if (it != std::end(keynamemap))
{
named = true;
res = it->name;
}
else if (key.key >= Key::F1 and key.key <= Key::F12)
{
named = true;
res = "F" + to_string((int)(key.key - Key::F1 + 1));
}
else
res = String{key.key};
if (key.modifiers & Key::Modifiers::Shift) { res = "s-" + res; named = true; }
if (key.modifiers & Key::Modifiers::Alt) { res = "a-" + res; named = true; }
if (key.modifiers & Key::Modifiers::Control) { res = "c-" + res; named = true; }
if (named)
res = StringView{'<'} + res + StringView{'>'};
return res;
}
UnitTest test_keys{[]()
{
KeyList keys{
{ ' ' },
{ 'c' },
{ Key::Up },
alt('j'),
ctrl('r'),
shift(Key::Up),
};
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);
kak_assert(ConstArrayView<Key>{parse_keys("a<c-a-b>c")} ==
ConstArrayView<Key>{'a', ctrl(alt({'b'})), 'c'});
kak_assert(parse_keys("x") == KeyList{ {'x'} });
kak_assert(parse_keys("<x>") == KeyList{ {'x'} });
kak_assert(parse_keys("<s-x>") == KeyList{ {'X'} });
kak_assert(parse_keys("<s-X>") == KeyList{ {'X'} });
kak_assert(parse_keys("<X>") == KeyList{ {'X'} });
kak_assert(parse_keys("X") == KeyList{ {'X'} });
kak_assert(parse_keys("<s-up>") == KeyList{ shift({Key::Up}) });
kak_assert(parse_keys("<s-tab>") == KeyList{ shift({Key::Tab}) });
kak_assert(key_to_str(shift({Key::Tab})) == "<s-tab>");
kak_expect_throw(key_parse_error, parse_keys("<-x>"));
kak_expect_throw(key_parse_error, parse_keys("<xy-z>"));
kak_expect_throw(key_parse_error, parse_keys("<x-y>"));
kak_expect_throw(key_parse_error, parse_keys("<s-/>"));
kak_expect_throw(key_parse_error, parse_keys("<s-ë>"));
kak_expect_throw(key_parse_error, parse_keys("<s-lt>"));
kak_expect_throw(key_parse_error, parse_keys("<f99>"));
kak_expect_throw(key_parse_error, parse_keys("<backtab>"));
kak_expect_throw(key_parse_error, parse_keys("<invalidkey>"));
}};
}