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/*
* peas-lua-internal.c
* This file is part of libpeas
*
* Copyright (C) 2015 - Garrett Regier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "peas-lua-internal.h"
#include <gio/gio.h>
#include <lauxlib.h>
#include <lualib.h>
#include "peas-lua-utils.h"
static gpointer hooks_key = NULL;
static gpointer failed_err_key = NULL;
static int
failed_fn (lua_State *L)
{
gchar *msg;
/* The first parameter is the Hooks table instance */
luaL_checktype (L, 1, LUA_TTABLE);
/* The tracebacks have a trailing newline */
msg = g_strchomp (g_strdup (luaL_checkstring (L, 2)));
g_warning ("%s", msg);
/* peas_lua_internal_call() knows to check for this value */
lua_pushlightuserdata (L, &failed_err_key);
g_free (msg);
return lua_error (L);
}
gboolean
peas_lua_internal_setup (lua_State *L)
{
GBytes *internal_lua;
const gchar *code;
gsize code_len;
/* We don't use the byte-compiled Lua source
* because glib-compile-resources cannot output
* depends for generated files.
*
* There are also concerns that the bytecode is
* not stable enough between different Lua versions.
*
* https://bugzilla.gnome.org/show_bug.cgi?id=673101
*/
internal_lua = g_resources_lookup_data ("/org/gnome/libpeas/loaders/"
"lua5.1/internal.lua",
G_RESOURCE_LOOKUP_FLAGS_NONE,
NULL);
g_return_val_if_fail (internal_lua != NULL, FALSE);
code = g_bytes_get_data (internal_lua, &code_len);
/* Filenames are prefixed with '@' */
if (luaL_loadbuffer (L, code, code_len, "@peas-lua-internal.lua") != 0)
{
g_warning ("Failed to load internal Lua code: %s",
lua_tostring (L, -1));
/* Pop error */
lua_pop (L, 1);
g_bytes_unref (internal_lua);
return FALSE;
}
g_bytes_unref (internal_lua);
if (!peas_lua_utils_call (L, 0, 1))
{
g_warning ("Failed to run internal Lua code: %s",
lua_tostring (L, -1));
/* Pop error */
lua_pop (L, 1);
return FALSE;
}
if (!lua_istable (L, -1))
{
g_warning ("Invalid result from internal Lua code: %s",
lua_tostring (L, -1));
/* Pop result */
lua_pop (L, 1);
return FALSE;
}
/* Set Hooks.failed to failed_fn */
lua_pushcfunction (L, failed_fn);
lua_setfield (L, -2, "failed");
/* Set registry[&hooks_key] = hooks */
lua_pushlightuserdata (L, &hooks_key);
lua_pushvalue (L, -2);
lua_rawset (L, LUA_REGISTRYINDEX);
/* Pop hooks */
lua_pop (L, -1);
return TRUE;
}
void
peas_lua_internal_shutdown (lua_State *L)
{
lua_pushlightuserdata (L, &hooks_key);
lua_pushnil (L);
lua_rawset (L, LUA_REGISTRYINDEX);
}
gboolean
peas_lua_internal_call (lua_State *L,
const gchar *name,
guint n_args,
gint return_type)
{
/* Get the Hooks table */
lua_pushlightuserdata (L, &hooks_key);
lua_rawget (L, LUA_REGISTRYINDEX);
/* Get the method */
lua_getfield (L, -1, name);
/* Swap the method and the table */
lua_insert (L, -2);
if (n_args > 0)
{
/* Before: [args..., method, table]
* After: [method, table, args...]
*/
lua_insert (L, -n_args - 2);
lua_insert (L, -n_args - 2);
}
if (!peas_lua_utils_call (L, 1 + n_args, 1))
{
/* Raised by failed_fn() to prevent printing the error */
if (!lua_isuserdata (L, -1) ||
lua_touserdata (L, -1) != &failed_err_key)
{
g_warning ("Failed to run internal Lua hook '%s':\n%s",
name, lua_tostring (L, -1));
}
/* Pop the error */
lua_pop (L, 1);
return FALSE;
}
if (lua_type (L, -1) != return_type)
{
/* Don't warn for a nil result */
if (lua_type (L, -1) != LUA_TNIL)
{
g_warning ("Invalid return value for internal Lua hook '%s': "
"expected %s, got: %s (%s)", name,
lua_typename (L, return_type),
lua_typename (L, lua_type (L, -1)),
lua_tostring (L, -1));
}
/* Pop result */
lua_pop (L, 1);
return FALSE;
}
/* Pop the result if nil */
if (return_type == LUA_TNIL)
lua_pop (L, 1);
return TRUE;
}
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