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1 #include <lua.h>
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2 #include <lauxlib.h>
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3 #include "seqlualib.h"
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4
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5 #define SEQLUA_ITERTYPE_IPAIRS 1
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6 #define SEQLUA_ITERTYPE_CALL 2
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7 #define SEQLUA_ITERTYPE_INDEX 3
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8 #define SEQLUA_ITERTYPE_RAW 4
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9
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10 void seqlua_iterinit(lua_State *L, seqlua_Iterator *iter, int idx) {
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11 if (luaL_getmetafield(L, idx, "__ipairs")) {
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12 lua_pushvalue(L, idx);
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13 lua_call(L, 1, 3);
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14 iter->itertype = SEQLUA_ITERTYPE_IPAIRS;
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15 } else {
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16 if (lua_type(L, idx) == LUA_TFUNCTION) {
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17 iter->itertype = SEQLUA_ITERTYPE_CALL;
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18 } else if (
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19 luaL_getmetafield(L, idx, "__index") ||
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20 luaL_getmetafield(L, idx, "__len")
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21 ) {
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22 lua_pop(L, 1);
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23 iter->len = luaL_len(L, idx);
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24 iter->itertype = SEQLUA_ITERTYPE_INDEX;
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25 } else {
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26 luaL_checktype(L, idx, LUA_TTABLE);
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27 iter->itertype = SEQLUA_ITERTYPE_RAW;
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28 }
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29 // always occupy 3 stack indicies
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30 lua_pushnil(L);
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31 lua_pushnil(L);
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32 lua_pushnil(L);
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33 iter->idx = idx;
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34 }
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35 iter->L = L;
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36 iter->i = 0;
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37 }
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38
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39 int seqlua_iternext(seqlua_Iterator *iter) {
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40 lua_State *L = iter->L;
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41 lua_Integer i = ++iter->i;
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42 switch (iter->itertype) {
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43 case SEQLUA_ITERTYPE_IPAIRS:
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44 lua_pushvalue(L, -3);
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45 lua_pushvalue(L, -3);
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46 lua_pushvalue(L, -3);
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47 lua_call(L, 2, 2);
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48 if (lua_isnil(L, -2)) {
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49 lua_pop(L, 5);
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50 return 0;
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51 }
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52 lua_remove(L, -3);
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53 return 1;
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54 case SEQLUA_ITERTYPE_CALL:
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55 lua_pushvalue(L, iter->idx);
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56 lua_call(L, 0, 1);
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57 break;
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58 case SEQLUA_ITERTYPE_INDEX:
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59 if (i > iter->len) {
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60 lua_pop(L, 3);
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61 return 0;
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62 }
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63 lua_pushinteger(L, i);
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64 lua_gettable(L, iter->idx);
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65 return 1;
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66 case SEQLUA_ITERTYPE_RAW:
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67 lua_rawgeti(L, iter->idx, i);
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68 break;
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69 }
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70 if (lua_isnil(L, -1)) {
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71 lua_pop(L, 4);
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72 return 0;
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73 }
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74 return 1;
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75 }
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76
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