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/* lkeybinder.c
* Copyright (C) 2010 Ulrik Sverdrup <ulrik.sverdrup@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdbool.h>
#include <keybinder.h>
#define LUA_LIB
#include <lua.h>
#include <lauxlib.h>
/* @lkeybinder_reg_key is a "ref" into the registry where we store
* a mapping from keystring to callback function in a table.
*/
static int lkeybinder_reg_key;
static void lkeybinder_check_init () {
static int did_init;
if (!did_init) {
keybinder_init();
did_init = true;
}
}
/* Callback closure with upvalues:
* 1 Lua callback function
* 2 Keystring
* 3 User data
*/
static int lkeybinder_closure (lua_State *L)
{
/* Call callback f(keystring, user_data) */
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, lua_upvalueindex(2));
lua_pushvalue(L, lua_upvalueindex(3));
lua_call(L, 2, 0);
return 0;
}
static void lkeybinder_handler (const char *keystring, void *user_data) {
lua_State *L = user_data;
/* get table */
lua_rawgeti(L, LUA_REGISTRYINDEX, lkeybinder_reg_key);
lua_pushstring(L, keystring);
lua_rawget(L, -2);
/* call callback closure */
if (lua_pcall(L, 0, 0, 0)) {
fprintf(stderr, "Error in callback:\n\t%s\n", lua_tostring(L, -1));
lua_pop(L, 1);
}
lua_pop(L, 1);
}
/* lkeybinder library function 'bind' */
static int lkeybinder_bind (lua_State *L)
{
int success;
int table_index;
const char *keystr = luaL_checkstring(L, 1);
luaL_checktype(L, 2, LUA_TFUNCTION);
/* argument 3 is nil/none or user data */
lua_settop(L, 3);
lkeybinder_check_init();
/* get RefTable */
lua_rawgeti(L, LUA_REGISTRYINDEX, lkeybinder_reg_key);
table_index = lua_gettop(L);
lua_pushstring(L, keystr);
lua_rawget(L, table_index);
if (!lua_isnil(L, -1)) {
success = false;
} else {
success = keybinder_bind(keystr, lkeybinder_handler, L);
if (success) {
lua_pushstring(L, keystr);
/* Create a closure with three upvalues
* RefTable[keystr] = <closure>
*/
lua_pushvalue(L, 2);
lua_pushstring(L, keystr);
lua_pushvalue(L, 3);
lua_pushcclosure(L, lkeybinder_closure, 3);
lua_rawset(L, table_index);
}
}
lua_pushboolean(L, success);
return 1;
}
/* lkeybinder library function 'unbind' */
static int lkeybinder_unbind (lua_State *L)
{
const char *keystr = luaL_checkstring(L, 1);
keybinder_unbind(keystr, lkeybinder_handler);
/* RefTable[keystring] = nil */
lua_rawgeti(L, LUA_REGISTRYINDEX, lkeybinder_reg_key);
lua_pushstring(L, keystr);
lua_pushnil(L);
lua_rawset(L, -3);
return 0;
}
/* lkeybinder library function 'get_current_event_time' */
static int lkeybinder_current_event_time (lua_State *L)
{
lua_pushnumber(L, keybinder_get_current_event_time());
return 1;
}
static const luaL_reg keybinderlib[] = {
{"bind", lkeybinder_bind},
{"unbind", lkeybinder_unbind},
{"get_current_event_time", lkeybinder_current_event_time},
{NULL, NULL}
};
LUALIB_API int luaopen_keybinder (lua_State *L)
{
luaL_register(L, "keybinder", keybinderlib);
lua_newtable(L);
lkeybinder_reg_key = luaL_ref(L, LUA_REGISTRYINDEX);
return 1;
}
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