mirror of
https://git.do.srb2.org/STJr/SRB2.git
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442 lines
9.3 KiB
C
442 lines
9.3 KiB
C
// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 2020-2023 by James R.
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// Copyright (C) 2020-2023 by Sonic Team Junior.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file lua_taglib.c
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/// \brief tag list iterator for Lua scripting
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#include "doomdef.h"
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#include "taglist.h"
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#include "r_state.h"
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#include "lua_script.h"
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#include "lua_libs.h"
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#ifdef MUTABLE_TAGS
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#include "z_zone.h"
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#endif
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static int tag_iterator(lua_State *L)
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{
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INT32 tag = lua_isnil(L, 2) ? -1 : lua_tonumber(L, 2);
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do
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{
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if (++tag >= MAXTAGS)
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return 0;
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}
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while (! in_bit_array(tags_available, tag)) ;
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lua_pushnumber(L, tag);
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return 1;
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}
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enum {
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#define UPVALUE lua_upvalueindex
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up_garray = UPVALUE(1),
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up_max_elements = UPVALUE(2),
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up_element_array = UPVALUE(3),
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up_sizeof_element = UPVALUE(4),
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up_meta = UPVALUE(5),
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#undef UPVALUE
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};
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static INT32 next_element(lua_State *L, const mtag_t tag, const size_t p)
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{
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taggroup_t ** garray = lua_touserdata(L, up_garray);
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const size_t * max_elements = lua_touserdata(L, up_max_elements);
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return Taggroup_Iterate(garray, *max_elements, tag, p);
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}
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static void push_element(lua_State *L, void *element)
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{
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if (LUA_RawPushUserdata(L, element) == LPUSHED_NEW)
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{
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lua_pushvalue(L, up_meta);
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lua_setmetatable(L, -2);
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}
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}
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static void push_next_element(lua_State *L, const INT32 element)
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{
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char * element_array = *(char **)lua_touserdata(L, up_element_array);
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const size_t sizeof_element = lua_tonumber(L, up_sizeof_element);
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push_element(L, &element_array[element * sizeof_element]);
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}
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struct element_iterator_state {
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mtag_t tag;
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size_t p;
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};
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static int element_iterator(lua_State *L)
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{
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struct element_iterator_state * state = lua_touserdata(L, 1);
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if (lua_isnoneornil(L, 3))
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state->p = 0;
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lua_pushnumber(L, ++state->p);
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lua_gettable(L, 1);
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return 1;
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}
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static int lib_iterateTags(lua_State *L)
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{
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if (lua_gettop(L) < 2)
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{
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lua_pushcfunction(L, tag_iterator);
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return 1;
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}
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else
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return tag_iterator(L);
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}
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static int lib_numTags(lua_State *L)
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{
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lua_pushnumber(L, num_tags);
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return 1;
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}
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static int lib_getTaggroup(lua_State *L)
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{
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struct element_iterator_state *state;
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mtag_t tag;
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if (lua_gettop(L) > 1)
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return luaL_error(L, "too many arguments");
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if (lua_isnoneornil(L, 1))
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{
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tag = MTAG_GLOBAL;
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}
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else
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{
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tag = lua_tonumber(L, 1);
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luaL_argcheck(L, tag >= -1, 1, "tag out of range");
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}
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state = lua_newuserdata(L, sizeof *state);
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state->tag = tag;
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state->p = 0;
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lua_pushvalue(L, lua_upvalueindex(1));
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lua_setmetatable(L, -2);
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return 1;
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}
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static int lib_getTaggroupElement(lua_State *L)
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{
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const size_t p = luaL_checknumber(L, 2) - 1;
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const mtag_t tag = *(mtag_t *)lua_touserdata(L, 1);
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const INT32 element = next_element(L, tag, p);
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if (element == -1)
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return 0;
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else
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{
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push_next_element(L, element);
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return 1;
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}
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}
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static int lib_numTaggroupElements(lua_State *L)
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{
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const mtag_t tag = *(mtag_t *)lua_touserdata(L, 1);
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if (tag == MTAG_GLOBAL)
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lua_pushnumber(L, *(size_t *)lua_touserdata(L, up_max_elements));
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else
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{
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const taggroup_t ** garray = lua_touserdata(L, up_garray);
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lua_pushnumber(L, Taggroup_Count(garray[tag]));
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}
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return 1;
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}
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#ifdef MUTABLE_TAGS
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static int meta_ref[2];
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#endif
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static int has_valid_field(lua_State *L)
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{
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int equal;
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lua_rawgeti(L, LUA_ENVIRONINDEX, 1);
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equal = lua_rawequal(L, 2, -1);
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lua_pop(L, 1);
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return equal;
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}
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static taglist_t * valid_taglist(lua_State *L, int idx, boolean getting)
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{
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taglist_t *list = *(taglist_t **)lua_touserdata(L, idx);
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if (list == NULL)
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{
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if (getting && has_valid_field(L))
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lua_pushboolean(L, 0);
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else
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LUA_ErrInvalid(L, "taglist");/* doesn't actually return */
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return NULL;
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}
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else
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return list;
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}
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static taglist_t * check_taglist(lua_State *L, int idx)
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{
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if (lua_isuserdata(L, idx) && lua_getmetatable(L, idx))
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{
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lua_getref(L, meta_ref[0]);
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lua_getref(L, meta_ref[1]);
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if (lua_rawequal(L, -3, -2) || lua_rawequal(L, -3, -1))
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{
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lua_pop(L, 3);
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return valid_taglist(L, idx, false);
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}
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}
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return luaL_argerror(L, idx, "must be a tag list"), NULL;
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}
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static int taglist_get(lua_State *L)
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{
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const taglist_t *list = valid_taglist(L, 1, true);
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if (list == NULL)/* valid check */
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return 1;
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if (lua_isnumber(L, 2))
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{
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const size_t i = lua_tonumber(L, 2);
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if (list && i <= list->count)
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{
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lua_pushnumber(L, list->tags[i - 1]);
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return 1;
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}
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else
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return 0;
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}
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else if (has_valid_field(L))
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{
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lua_pushboolean(L, 1);
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return 1;
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}
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else
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{
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lua_getmetatable(L, 1);
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lua_replace(L, 1);
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lua_rawget(L, 1);
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return 1;
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}
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}
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static int taglist_len(lua_State *L)
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{
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const taglist_t *list = valid_taglist(L, 1, false);
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lua_pushnumber(L, list->count);
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return 1;
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}
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static int taglist_equal(lua_State *L)
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{
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const taglist_t *lhs = check_taglist(L, 1);
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const taglist_t *rhs = check_taglist(L, 2);
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lua_pushboolean(L, Tag_Compare(lhs, rhs));
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return 1;
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}
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static int taglist_iterator(lua_State *L)
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{
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const taglist_t *list = valid_taglist(L, 1, false);
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const size_t i = 1 + lua_tonumber(L, lua_upvalueindex(1));
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if (i <= list->count)
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{
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lua_pushnumber(L, list->tags[i - 1]);
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/* watch me exploit an upvalue as a control because
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I want to use the control as the value */
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lua_pushnumber(L, i);
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lua_replace(L, lua_upvalueindex(1));
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return 1;
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}
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else
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return 0;
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}
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static int taglist_iterate(lua_State *L)
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{
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check_taglist(L, 1);
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lua_pushnumber(L, 0);
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lua_pushcclosure(L, taglist_iterator, 1);
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lua_pushvalue(L, 1);
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return 2;
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}
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static int taglist_find(lua_State *L)
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{
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const taglist_t *list = check_taglist(L, 1);
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const mtag_t tag = luaL_checknumber(L, 2);
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lua_pushboolean(L, Tag_Find(list, tag));
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return 1;
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}
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static int taglist_shares(lua_State *L)
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{
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const taglist_t *lhs = check_taglist(L, 1);
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const taglist_t *rhs = check_taglist(L, 2);
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lua_pushboolean(L, Tag_Share(lhs, rhs));
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return 1;
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}
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/* only sector tags are mutable... */
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#ifdef MUTABLE_TAGS
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static size_t sector_of_taglist(taglist_t *list)
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{
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return (sector_t *)((char *)list - offsetof (sector_t, tags)) - sectors;
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}
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static int this_taglist(lua_State *L)
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{
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lua_settop(L, 1);
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return 1;
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}
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static int taglist_add(lua_State *L)
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{
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taglist_t *list = *(taglist_t **)luaL_checkudata(L, 1, META_SECTORTAGLIST);
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const mtag_t tag = luaL_checknumber(L, 2);
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if (! Tag_Find(list, tag))
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{
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Taggroup_Add(tags_sectors, tag, sector_of_taglist(list));
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Tag_Add(list, tag);
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}
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return this_taglist(L);
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}
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static int taglist_remove(lua_State *L)
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{
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taglist_t *list = *(taglist_t **)luaL_checkudata(L, 1, META_SECTORTAGLIST);
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const mtag_t tag = luaL_checknumber(L, 2);
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size_t i;
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for (i = 0; i < list->count; ++i)
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{
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if (list->tags[i] == tag)
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{
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if (list->count > 1)
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{
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memmove(&list->tags[i], &list->tags[i + 1],
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(list->count - 1 - i) * sizeof (mtag_t));
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list->tags = Z_Realloc(list->tags,
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(--list->count) * sizeof (mtag_t), PU_LEVEL, NULL);
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Taggroup_Remove(tags_sectors, tag, sector_of_taglist(list));
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}
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else/* reset to default tag */
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Tag_SectorFSet(sector_of_taglist(list), 0);
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break;
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}
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}
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return this_taglist(L);
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}
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#endif/*MUTABLE_TAGS*/
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void LUA_InsertTaggroupIterator
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( lua_State *L,
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taggroup_t *garray[],
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size_t * max_elements,
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void * element_array,
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size_t sizeof_element,
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const char * meta)
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{
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lua_createtable(L, 0, 3);
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lua_pushlightuserdata(L, garray);
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lua_pushlightuserdata(L, max_elements);
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lua_pushvalue(L, -2);
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lua_pushvalue(L, -2);
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lua_pushlightuserdata(L, element_array);
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lua_pushnumber(L, sizeof_element);
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luaL_getmetatable(L, meta);
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lua_pushcclosure(L, lib_getTaggroupElement, 5);
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lua_setfield(L, -4, "__index");
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lua_pushcclosure(L, lib_numTaggroupElements, 2);
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lua_setfield(L, -2, "__len");
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LUA_SetCFunctionField(L, "__call", element_iterator);
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lua_pushcclosure(L, lib_getTaggroup, 1);
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lua_setfield(L, -2, "tagged");
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}
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static luaL_Reg taglist_lib[] = {
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{"iterate", taglist_iterate},
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{"find", taglist_find},
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{"shares", taglist_shares},
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#ifdef MUTABLE_TAGS
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{"add", taglist_add},
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{"remove", taglist_remove},
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#endif
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{0}
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};
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static void open_taglist(lua_State *L)
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{
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luaL_register(L, "taglist", taglist_lib);
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lua_getfield(L, -1, "find");
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lua_setfield(L, -2, "has");
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}
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#define new_literal(L, s) \
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(lua_pushliteral(L, s), luaL_ref(L, -2))
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#ifdef MUTABLE_TAGS
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static int
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#else
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static void
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#endif
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set_taglist_metatable(lua_State *L, const char *meta)
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{
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luaL_newmetatable(L, meta);
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lua_pushcfunction(L, taglist_get);
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lua_createtable(L, 0, 1);
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new_literal(L, "valid");
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lua_setfenv(L, -2);
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lua_setfield(L, -2, "__index");
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LUA_SetCFunctionField(L, "__len", taglist_len);
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LUA_SetCFunctionField(L, "__eq", taglist_equal);
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#ifdef MUTABLE_TAGS
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return luaL_ref(L, LUA_REGISTRYINDEX);
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#endif
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}
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int LUA_TagLib(lua_State *L)
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{
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LUA_CreateAndSetUserdataField(L, LUA_GLOBALSINDEX, "tags", NULL, NULL, lib_numTags, true);
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lua_createtable(L, 0, 1);
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LUA_SetCFunctionField(L, "iterate", lib_iterateTags);
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lua_setfield(L, -2, "__index");
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lua_pop(L, 2);
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open_taglist(L);
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#ifdef MUTABLE_TAGS
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meta_ref[0] = set_taglist_metatable(L, META_TAGLIST);
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meta_ref[1] = set_taglist_metatable(L, META_SECTORTAGLIST);
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#else
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set_taglist_metatable(L, META_TAGLIST);
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#endif
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return 0;
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}
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