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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 iter->idx = idx;
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13 if (lua_type(L, idx) == LUA_TFUNCTION) {
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14 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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15 } else if (luaL_getmetafield(L, idx, "__call")) {
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16 lua_pop(L, 1);
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17 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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18 } else if (luaL_getmetafield(L, idx, "__index")) {
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19 lua_pop(L, 1);
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20 iter->itertype = SEQLUA_ITERTYPE_META;
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21 } else {
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22 luaL_checktype(L, idx, LUA_TTABLE);
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23 iter->itertype = SEQLUA_ITERTYPE_RAW;
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24 }
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25 iter->i = 0;
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26 }
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27
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28 int seqlua_iternext(seqlua_Iterator *iter) {
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29 lua_State *L = iter->L;
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30 lua_Integer i = ++iter->i;
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31 switch (iter->itertype) {
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32 case SEQLUA_ITERTYPE_FUNC:
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33 lua_pushvalue(L, iter->idx);
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34 lua_call(L, 0, 1);
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35 break;
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36 case SEQLUA_ITERTYPE_META:
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37 lua_pushinteger(L, i);
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38 lua_gettable(L, iter->idx);
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39 break;
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40 case SEQLUA_ITERTYPE_RAW:
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41 lua_rawgeti(L, iter->idx, i);
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42 break;
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43 }
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44 if (lua_isnil(L, -1)) {
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45 lua_pop(L, 1);
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46 return 0;
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47 }
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48 return 1;
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49 }
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50
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51 static int seqlua_iterclosureaux_raw(lua_State *L) {
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52 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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53 lua_rawgeti(L, lua_upvalueindex(1), i);
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54 if (lua_isnil(L, -1)) return 1;
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55 lua_pushinteger(L, i);
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56 lua_replace(L, lua_upvalueindex(2));
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57 return 1;
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58 }
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59
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60 static int seqlua_iterclosureaux_meta(lua_State *L) {
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61 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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62 lua_pushinteger(L, i);
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63 lua_gettable(L, lua_upvalueindex(1));
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64 if (lua_isnil(L, -1)) return 1;
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65 lua_pushinteger(L, i);
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66 lua_replace(L, lua_upvalueindex(2));
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67 return 1;
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68 }
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69
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70 void seqlua_iterclosure(lua_State *L, int idx) {
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71 luaL_checkany(L, idx); // provides better error message
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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 lua_pop(L, 1);
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76 } else if (luaL_getmetafield(L, idx, "__index")) {
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77 lua_pop(L, 1);
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78 lua_pushvalue(L, idx);
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79 lua_pushinteger(L, 0);
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80 lua_pushcclosure(L, seqlua_iterclosureaux_meta, 2);
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81 lua_replace(L, idx);
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82 } else {
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83 luaL_checktype(L, idx, LUA_TTABLE);
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84 lua_pushvalue(L, idx);
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85 lua_pushinteger(L, 0);
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86 lua_pushcclosure(L, seqlua_iterclosureaux_raw, 2);
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87 lua_replace(L, idx);
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88 }
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89 }
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90
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