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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 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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15 } else if (lua_type(L, idx) == LUA_TFUNCTION) {
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16 lua_pushvalue(L, idx);
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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 lua_pushvalue(L, idx);
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27 }
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28 iter->i = 0;
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29 }
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30
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31 int seqlua_iternext(seqlua_Iterator *iter) {
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32 lua_State *L = iter->L;
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33 lua_Integer i = ++iter->i;
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34 switch (iter->itertype) {
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35 case SEQLUA_ITERTYPE_FUNC:
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36 lua_pushvalue(L, -1);
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37 lua_call(L, 0, 1);
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38 break;
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39 case SEQLUA_ITERTYPE_META:
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40 lua_pushinteger(L, i);
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41 lua_gettable(L, -2);
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42 break;
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43 case SEQLUA_ITERTYPE_RAW:
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44 lua_rawgeti(L, -1, i);
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45 }
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46 if (lua_isnil(L, -1)) {
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47 lua_pop(L, 2);
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48 return 0;
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49 }
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50 return 1;
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51 }
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52
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53 static int seqlua_iterclosureaux_raw(lua_State *L) {
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54 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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55 lua_rawgeti(L, lua_upvalueindex(1), i);
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56 if (lua_isnil(L, -1)) return 1;
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57 lua_pushinteger(L, i);
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58 lua_replace(L, lua_upvalueindex(2));
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59 return 1;
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60 }
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61
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62 static int seqlua_iterclosureaux_meta(lua_State *L) {
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63 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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64 lua_pushinteger(L, i);
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65 lua_gettable(L, lua_upvalueindex(1));
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66 if (lua_isnil(L, -1)) return 1;
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67 lua_pushinteger(L, i);
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68 lua_replace(L, lua_upvalueindex(2));
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69 return 1;
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70 }
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71
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72 void seqlua_iterclosure(lua_State *L, int idx) {
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73 if (lua_type(L, idx) == LUA_TFUNCTION) {
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74 // do nothing
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75 } else if (luaL_getmetafield(L, idx, "__call")) {
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76 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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77 lua_replace(L, idx);
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78 } else if (luaL_getmetafield(L, idx, "__index")) {
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79 lua_pop(L, 1);
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80 lua_pushvalue(L, idx);
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81 lua_pushinteger(L, 0);
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82 lua_pushcclosure(L, seqlua_iterclosureaux_raw, 2);
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83 lua_replace(L, idx);
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84 } else {
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85 luaL_checktype(L, idx, LUA_TTABLE);
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86 lua_pushvalue(L, idx);
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87 lua_pushinteger(L, 0);
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88 lua_pushcclosure(L, seqlua_iterclosureaux_meta, 2);
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89 lua_replace(L, idx);
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90 }
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91 }
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92
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