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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_CALL 1
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6 #define SEQLUA_ITERTYPE_FUNC 2
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7 #define SEQLUA_ITERTYPE_META 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 luaL_checkany(L, idx); // provides better error message
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12 iter->L = L;
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13 if (luaL_getmetafield(L, idx, "__call")) {
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14 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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15 iter->idx = lua_gettop(L);
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16 iter->callargidx = idx;
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17 iter->itertype = SEQLUA_ITERTYPE_CALL;
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18 } else if (lua_type(L, idx) == LUA_TFUNCTION) {
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19 lua_pushnil(L); // dummy value
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20 iter->idx = idx;
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21 iter->itertype = SEQLUA_ITERTYPE_FUNC;
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22 } else {
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23 iter->idx = idx;
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24 if (luaL_getmetafield(L, idx, "__index")) {
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25 iter->itertype = SEQLUA_ITERTYPE_META;
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26 // leave __index as dummy value
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27 } else {
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28 lua_pushnil(L); // dummy value
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29 luaL_checktype(L, idx, LUA_TTABLE);
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30 iter->itertype = SEQLUA_ITERTYPE_RAW;
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31 }
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32 }
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33 iter->i = 0;
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34 }
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35
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36 int seqlua_iternext(seqlua_Iterator *iter) {
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37 lua_State *L = iter->L;
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38 lua_Integer i = ++iter->i;
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39 switch (iter->itertype) {
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40 case SEQLUA_ITERTYPE_CALL:
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41 lua_pushvalue(L, iter->idx);
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42 lua_pushvalue(L, iter->callargidx);
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43 lua_call(L, 1, 1);
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44 break;
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45 case SEQLUA_ITERTYPE_FUNC:
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46 lua_pushvalue(L, iter->idx);
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47 lua_call(L, 0, 1);
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48 break;
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49 case SEQLUA_ITERTYPE_META:
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50 lua_pushinteger(L, i);
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51 lua_gettable(L, iter->idx);
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52 break;
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53 case SEQLUA_ITERTYPE_RAW:
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54 lua_rawgeti(L, iter->idx, i);
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55 break;
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56 }
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57 if (lua_isnil(L, -1)) {
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58 lua_pop(L, 2); // remove nil and dummy value
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59 return 0;
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60 }
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61 return 1;
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62 }
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63
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64 static int seqlua_iterclosureaux_raw(lua_State *L) {
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65 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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66 lua_rawgeti(L, lua_upvalueindex(1), i);
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67 if (lua_isnil(L, -1)) return 1;
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68 lua_pushinteger(L, i);
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69 lua_replace(L, lua_upvalueindex(2));
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70 return 1;
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71 }
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72
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73 static int seqlua_iterclosureaux_meta(lua_State *L) {
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74 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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75 lua_pushinteger(L, i);
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76 lua_gettable(L, lua_upvalueindex(1));
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77 if (lua_isnil(L, -1)) return 1;
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78 lua_pushinteger(L, i);
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79 lua_replace(L, lua_upvalueindex(2));
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80 return 1;
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81 }
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82
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83 static int seqlua_iterclosureaux_call(lua_State *L) {
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84 lua_pushvalue(L, lua_upvalueindex(1));
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85 lua_pushvalue(L, lua_upvalueindex(2));
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86 lua_call(L, 1, 1);
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87 return 1;
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88 }
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89
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90 void seqlua_iterclosure(lua_State *L, int idx) {
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91 luaL_checkany(L, idx); // provides better error message
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92 if (lua_type(L, idx) == LUA_TFUNCTION) {
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93 // do nothing
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94 } else if (luaL_getmetafield(L, idx, "__call")) {
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95 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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96 lua_pushvalue(L, idx);
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97 lua_pushcclosure(L, seqlua_iterclosureaux_call, 2);
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98 lua_replace(L, idx);
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99 } else if (luaL_getmetafield(L, idx, "__index")) {
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100 lua_pop(L, 1);
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101 lua_pushvalue(L, idx);
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102 lua_pushinteger(L, 0);
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103 lua_pushcclosure(L, seqlua_iterclosureaux_raw, 2);
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104 lua_replace(L, idx);
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105 } else {
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106 luaL_checktype(L, idx, LUA_TTABLE);
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107 lua_pushvalue(L, idx);
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108 lua_pushinteger(L, 0);
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109 lua_pushcclosure(L, seqlua_iterclosureaux_meta, 2);
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110 lua_replace(L, idx);
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111 }
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112 }
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113
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