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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_FUNC 1
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6 #define SEQLUA_ITERTYPE_META 2
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7 #define SEQLUA_ITERTYPE_RAW 3
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8
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9 void seqlua_iterinit(lua_State *L, seqlua_Iterator *iter, int idx) {
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10 luaL_checkany(L, idx); // provides better error message
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11 iter->L = L;
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12 if (luaL_getmetafield(L, idx, "__call")) {
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13 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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14 lua_replace(L, idx);
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15 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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16 } else if (lua_type(L, idx) == LUA_TFUNCTION) {
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17 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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18 } else {
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19 if (luaL_getmetafield(L, idx, "__index")) {
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20 lua_pop(L, 1);
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21 iter->itertype = SEQLUA_ITERTYPE_META;
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22 } else {
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23 luaL_checktype(L, idx, LUA_TTABLE);
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24 iter->itertype = SEQLUA_ITERTYPE_RAW;
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25 }
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26 }
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27 iter->i = 0;
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28 }
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29
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30 int seqlua_iternext(seqlua_Iterator *iter) {
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31 lua_State *L = iter->L;
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32 lua_Integer i = ++iter->i;
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33 switch (iter->itertype) {
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34 case SEQLUA_ITERTYPE_FUNC:
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35 lua_pushvalue(L, -1);
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36 lua_call(L, 0, 1);
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37 break;
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38 case SEQLUA_ITERTYPE_META:
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39 lua_pushinteger(L, i);
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40 lua_gettable(L, -2);
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41 break;
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42 case SEQLUA_ITERTYPE_RAW:
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43 lua_rawgeti(L, -1, i);
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44 }
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45 if (lua_isnil(L, -1)) {
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46 lua_pop(L, 1);
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47 return 0;
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48 }
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49 return 1;
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50 }
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51
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52 static int seqlua_iterclosureaux_raw(lua_State *L) {
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53 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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54 lua_rawgeti(L, lua_upvalueindex(1), i);
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55 if (lua_isnil(L, -1)) return 1;
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56 lua_pushinteger(L, i);
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57 lua_replace(L, lua_upvalueindex(2));
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58 return 1;
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59 }
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60
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61 static int seqlua_iterclosureaux_meta(lua_State *L) {
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62 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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63 lua_pushinteger(L, i);
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64 lua_gettable(L, lua_upvalueindex(1));
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65 if (lua_isnil(L, -1)) return 1;
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66 lua_pushinteger(L, i);
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67 lua_replace(L, lua_upvalueindex(2));
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68 return 1;
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69 }
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70
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71 void seqlua_iterclosure(lua_State *L, int idx) {
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72 if (lua_type(L, idx) == LUA_TFUNCTION) {
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73 // do nothing
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74 } else if (luaL_getmetafield(L, idx, "__call")) {
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75 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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76 lua_replace(L, idx);
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77 } else if (luaL_getmetafield(L, idx, "__index")) {
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78 lua_pop(L, 1);
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79 lua_pushvalue(L, idx);
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80 lua_pushinteger(L, 0);
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81 lua_pushcclosure(L, seqlua_iterclosureaux_raw, 2);
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82 lua_replace(L, idx);
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83 } else {
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84 luaL_checktype(L, idx, LUA_TTABLE);
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85 lua_pushvalue(L, idx);
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86 lua_pushinteger(L, 0);
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87 lua_pushcclosure(L, seqlua_iterclosureaux_meta, 2);
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88 lua_replace(L, idx);
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89 }
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90 }
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91
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