4coder/4ed_command.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 19.08.2015
*
* Command management functions for 4coder
*
*/
// TOP
typedef void (*Command_Function)(struct Command_Data *command, struct Command_Binding binding);
struct Command_Binding{
Command_Function function;
Custom_Command_Function *custom;
i64 hash;
};
struct Command_Map{
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Command_Map *parent;
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Command_Binding vanilla_keyboard_default;
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Command_Binding *commands;
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i32 count, max;
};
internal void command_null(Command_Data *command);
internal i64
map_hash(u16 event_code, u8 modifiers){
i64 result = (event_code << 4) | modifiers;
return result;
}
internal bool32
map_add(Command_Map *map, u16 event_code, u8 modifiers, Command_Function function, Custom_Command_Function *custom = 0){
Assert(map->count * 8 < map->max * 7);
Command_Binding bind;
bind.function = function;
bind.custom = custom;
bind.hash = map_hash(event_code, modifiers);
i32 max = map->max;
i32 index = bind.hash % max;
Command_Binding entry;
while ((entry = map->commands[index]).function && entry.hash != -1){
if (entry.hash == bind.hash){
return 1;
}
index = (index + 1) % max;
}
map->commands[index] = bind;
++map->count;
return 0;
}
internal bool32
map_find_entry(Command_Map *map, u16 event_code, u8 modifiers, i32 *index_out){
i64 hash = map_hash(event_code, modifiers);
i32 max = map->max;
i32 index = hash % map->max;
Command_Binding entry;
while ((entry = map->commands[index]).function){
if (entry.hash == hash){
*index_out = index;
return 1;
}
index = (index + 1) % max;
}
return 0;
}
internal bool32
map_find(Command_Map *map, u16 event_code, u8 modifiers, Command_Binding *bind_out){
bool32 result;
i32 index;
result = map_find_entry(map, event_code, modifiers, &index);
if (result){
*bind_out = map->commands[index];
}
return result;
}
internal bool32
map_drop(Command_Map *map, u16 event_code, u8 modifiers){
bool32 result;
i32 index;
result = map_find_entry(map, event_code, modifiers, &index);
if (result){
map->commands[index].function = 0;
map->commands[index].hash = -1;
}
return result;
}
internal void
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map_init(Command_Map *commands, Partition *part, i32 max, Command_Map *parent){
commands->parent = parent;
commands->commands = push_array(part, Command_Binding, max);
memset(commands->commands, 0, max*sizeof(*commands->commands));
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commands->vanilla_keyboard_default = {};
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commands->max = max;
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commands->count = 0;
}
internal void
map_get_vanilla_keyboard_default(Command_Map *map, u8 command, Command_Binding *bind_out){
if (command == MDFR_NONE){
*bind_out = map->vanilla_keyboard_default;
}
}
internal Command_Binding
map_extract(Command_Map *map, Key_Single key){
Command_Binding bind = {};
u8 command = MDFR_NONE;
bool32 ctrl = key.modifiers[CONTROL_KEY_CONTROL];
bool32 alt = key.modifiers[CONTROL_KEY_ALT];
bool32 shift = key.modifiers[CONTROL_KEY_SHIFT] && key.key.loose_keycode;
if (shift) command |= MDFR_SHIFT;
if (ctrl) command |= MDFR_CTRL;
if (alt) command |= MDFR_ALT;
u16 code = key.key.character_no_caps_lock;
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if (code == 0) code = key.key.keycode;
map_find(map, code, command, &bind);
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if (bind.function == 0 && key.key.character_no_caps_lock != 0){
map_get_vanilla_keyboard_default(map, command, &bind);
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}
return bind;
}
// BOTTOM