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/*
* ld-lua.c
*
* This file is a part of logdiag.
* Copyright Přemysl Janouch 2010. All rights reserved.
*
* See the file LICENSE for licensing information.
*
*/
#include <gtk/gtk.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "config.h"
#include "ld-symbol-library.h"
#include "ld-lua.h"
/* TODO */
/* A virtual superclass can be made for this. */
/* Lua state belongs to the library.
* One Lua file should be able to register multiple symbols.
*/
/* How does the application call the function for rendering?
* logdiag.symbols -- readonly table (from lua) -- this can be probably
* accomplished using a custom metatable that errors out on newindex,
* items will be added to this table only in C.
* logdiag.symbols[ident].render(cr) -- here "ident" is the full path
* to this symbol
* logdiag.symbols[ident].names[lang, area, terminals] -- these
* subarrays need not be in this array
*
*/
static void *
ld_lua_alloc (void *ud, void *ptr, size_t osize, size_t nsize);
static int
ld_lua_logdiag_register (lua_State *L);
static luaL_Reg ld_lua_logdiag_lib[] =
{
{"register", ld_lua_logdiag_register},
{NULL, NULL}
};
static int
ld_lua_cairo_move_to (lua_State *L);
static int
ld_lua_cairo_line_to (lua_State *L);
static int
ld_lua_cairo_stroke (lua_State *L);
static int
ld_lua_cairo_stroke_preserve (lua_State *L);
static int
ld_lua_cairo_fill (lua_State *L);
static int
ld_lua_cairo_fill_preserve (lua_State *L);
static luaL_Reg ld_lua_cairo_table[] =
{
{"move_to", ld_lua_cairo_move_to},
{"line_to", ld_lua_cairo_line_to},
{"stroke", ld_lua_cairo_stroke},
{"stroke_preserve", ld_lua_cairo_stroke_preserve},
{"fill", ld_lua_cairo_fill},
{"fill_preserve", ld_lua_cairo_fill_preserve},
{NULL, NULL}
};
/* ===== Generic =========================================================== */
lua_State *
ld_lua_init (void)
{
lua_State *L;
L = lua_newstate (ld_lua_alloc, NULL);
g_return_val_if_fail (L != NULL, NULL);
/* TODO: lua_atpanic () */
/* Load some safe libraries. */
lua_pushcfunction (L, luaopen_string);
lua_call (L, 0, 0);
lua_pushcfunction (L, luaopen_table);
lua_call (L, 0, 0);
lua_pushcfunction (L, luaopen_math);
lua_call (L, 0, 0);
/* Load the application library. */
luaL_register (L, "logdiag", ld_lua_logdiag_lib);
}
void
ld_lua_destroy (lua_State *L)
{
lua_close (L);
}
static void *
ld_lua_alloc (void *ud, void *ptr, size_t osize, size_t nsize)
{
if (!nsize)
{
g_free (ptr);
return NULL;
}
else
return g_try_realloc (ptr, nsize);
}
/* ===== Application library =============================================== */
static int
ld_lua_logdiag_register (lua_State *L)
{
/* TODO: Create a symbol. */
/* XXX: Shouldn't this function be a closure with LdLibrary userdata?
* It is also possible to have the userdata in the "logdiag" table.
*/
#if 0
lua_newtable (L);
/* TODO: Push a function. */
lua_call (L, 1, 0);
#endif /* 0 */
}
/* ===== Cairo ============================================================= */
static void
push_cairo_object (lua_State *L, cairo_t *cr)
{
luaL_Reg *fn;
/* Create a table. */
lua_newtable (L);
/* Add methods. */
for (fn = ld_lua_cairo_table; fn->name; fn++)
{
lua_pushlightuserdata (L, cr);
lua_pushcclosure (L, fn->func, 1);
lua_setfield (L, -2, fn->name);
}
}
static int
ld_lua_cairo_move_to (lua_State *L)
{
return 0;
}
static int
ld_lua_cairo_line_to (lua_State *L)
{
return 0;
}
static int
ld_lua_cairo_stroke (lua_State *L)
{
return 0;
}
static int
ld_lua_cairo_stroke_preserve (lua_State *L)
{
return 0;
}
static int
ld_lua_cairo_fill (lua_State *L)
{
return 0;
}
static int
ld_lua_cairo_fill_preserve (lua_State *L)
{
return 0;
}
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