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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 #include <string.h>
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5
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6 #define SEQLUA_ITERTYPE_IPAIRS 1
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7 #define SEQLUA_ITERTYPE_CALL 2
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8 #define SEQLUA_ITERTYPE_INDEX 3
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9 #define SEQLUA_ITERTYPE_RAW 4
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10
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11 void seqlua_iterinit(lua_State *L, seqlua_Iterator *iter, int idx) {
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12 if (luaL_getmetafield(L, idx, "__ipairs")) {
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13 lua_pushvalue(L, idx);
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14 lua_call(L, 1, 3);
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15 if (lua_type(L, -3) == LUA_TSTRING) {
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16 const char *method = lua_tostring(L, -3);
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17 if (!strcmp(method, "raw")) {
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18 iter->itertype = SEQLUA_ITERTYPE_RAW;
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19 } else if (!strcmp(method, "index")) {
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20 iter->itertype = SEQLUA_ITERTYPE_INDEX;
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21 } else if (!strcmp(method, "call")) {
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22 iter->itertype = SEQLUA_ITERTYPE_CALL;
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23 } else {
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24 luaL_error(L, "Unexpected string returned by __ipairs metamethod");
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25 }
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26 iter->idx = lua_gettop(L) - 1;
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27 } else {
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28 iter->itertype = SEQLUA_ITERTYPE_IPAIRS;
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29 }
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30 } else {
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31 if (lua_type(L, idx) == LUA_TFUNCTION) {
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32 iter->itertype = SEQLUA_ITERTYPE_CALL;
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33 } else if (luaL_getmetafield(L, idx, "__index")) {
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34 lua_pop(L, 1);
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35 iter->itertype = SEQLUA_ITERTYPE_INDEX;
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36 } else {
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37 luaL_checktype(L, idx, LUA_TTABLE);
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38 iter->itertype = SEQLUA_ITERTYPE_RAW;
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39 }
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40 // always occupy 3 stack indicies
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41 lua_pushnil(L);
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42 lua_pushnil(L);
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43 lua_pushnil(L);
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44 iter->idx = idx;
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45 }
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46 iter->L = L;
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47 iter->i = 0;
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48 }
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49
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50 int seqlua_iternext(seqlua_Iterator *iter) {
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51 lua_State *L = iter->L;
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52 lua_Integer i = ++iter->i;
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53 switch (iter->itertype) {
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54 case SEQLUA_ITERTYPE_IPAIRS:
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55 lua_pushvalue(L, -3);
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56 lua_pushvalue(L, -3);
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57 lua_pushvalue(L, -3);
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58 lua_call(L, 2, 2);
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59 if (lua_isnil(L, -2)) {
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60 lua_pop(L, 5);
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61 return 0;
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62 }
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63 lua_remove(L, -3);
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64 return 1;
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65 case SEQLUA_ITERTYPE_CALL:
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66 lua_pushvalue(L, iter->idx);
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67 lua_call(L, 0, 1);
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68 break;
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69 case SEQLUA_ITERTYPE_INDEX:
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70 lua_pushinteger(L, i);
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71 lua_gettable(L, iter->idx);
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72 break;
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73 case SEQLUA_ITERTYPE_RAW:
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74 lua_rawgeti(L, iter->idx, i);
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75 break;
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76 }
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77 if (lua_isnil(L, -1)) {
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78 lua_pop(L, 4);
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79 return 0;
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80 }
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81 return 1;
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82 }
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83
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