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1 #include <lua.h>
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2 #include <lauxlib.h>
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3
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4 static int seqlua_ipairsaux_raw(lua_State *L) {
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5 lua_Integer i;
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6 luaL_checktype(L, 1, LUA_TTABLE);
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7 i = luaL_checkinteger(L, 2) + 1;
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8 lua_pushinteger(L, i);
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9 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
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10 return lua_isnil(L, -1) ? 1 : 2;
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11 }
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12
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13 static int seqlua_ipairsaux_meta(lua_State *L) {
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14 lua_Integer i;
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15 i = luaL_checkinteger(L, 2) + 1;
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16 lua_pushinteger(L, i);
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17 lua_pushinteger(L, i);
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18 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
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19 return lua_isnil(L, -1) ? 1 : 2;
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20 }
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21
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22 static int seqlua_ipairsaux_func(lua_State *L) {
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23 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
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24 lua_insert(L, 1);
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25 lua_settop(L, 2);
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26 lua_call(L, 0, LUA_MULTRET);
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27 if (lua_isnoneornil(L, 2)) {
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28 lua_settop(L, 0);
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29 lua_pushnil(L);
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30 return 1;
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31 } else {
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32 return lua_gettop(L);
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33 }
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34 }
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35
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36 static int seqlua_ipairs(lua_State *L) {
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37 luaL_checkany(L, 1); // provides better error message
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38 if (
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39 lua_type(L, 1) == LUA_TFUNCTION ||
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40 (luaL_getmetafield(L, 1, "__call") && (lua_pop(L, 1), 1))
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41 ) {
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42 lua_pushcfunction(L, seqlua_ipairsaux_func);
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43 } else if (luaL_getmetafield(L, 1, "__index")) {
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44 lua_pushcfunction(L, seqlua_ipairsaux_meta);
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45 } else {
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46 luaL_checktype(L, 1, LUA_TTABLE);
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47 lua_pushcfunction(L, seqlua_ipairsaux_raw);
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48 }
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49 lua_pushvalue(L, 1);
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50 lua_pushinteger(L, 0);
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51 return 3;
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52 }
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53
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54 int luaopen_seqlua(lua_State *L) {
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55 lua_pushcfunction(L, seqlua_ipairs);
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56 lua_setglobal(L, "ipairs");
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57 return 1;
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58 }
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