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1 #include <lua.h>
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2 #include <lauxlib.h>
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3
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4 static int seqlua_ipairsaux_raw(lua_State *L) {
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5 lua_Integer i;
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6 luaL_checktype(L, 1, LUA_TTABLE);
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7 i = luaL_checkinteger(L, 2) + 1;
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8 lua_pushinteger(L, i);
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9 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
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10 return lua_isnil(L, -1) ? 1 : 2;
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11 }
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12
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13 static int seqlua_ipairsaux_meta(lua_State *L) {
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14 lua_Integer i;
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15 i = luaL_checkinteger(L, 2) + 1;
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16 lua_pushinteger(L, i);
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17 lua_pushinteger(L, i);
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18 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
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19 return lua_isnil(L, -1) ? 1 : 2;
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20 }
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21
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22 static int seqlua_ipairsaux_func(lua_State *L) {
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23 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
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24 lua_insert(L, 1);
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25 lua_settop(L, 2);
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26 lua_call(L, 0, LUA_MULTRET);
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27 if (lua_isnoneornil(L, 2)) {
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28 lua_settop(L, 0);
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29 lua_pushnil(L);
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30 return 1;
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31 } else {
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32 return lua_gettop(L);
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33 }
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34 }
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35
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36 static int seqlua_ipairsaux_triplet(lua_State *L) {
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37 lua_Integer i = lua_tointeger(L, lua_upvalueindex(4)) + 1;
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38 lua_settop(L, 0);
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39 lua_pushinteger(L, i);
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40 lua_replace(L, lua_upvalueindex(4));
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41 lua_pushinteger(L, i);
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42 lua_pushvalue(L, lua_upvalueindex(1));
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43 lua_pushvalue(L, lua_upvalueindex(2));
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44 lua_pushvalue(L, lua_upvalueindex(3));
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45 lua_call(L, 2, LUA_MULTRET);
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46 if (lua_isnoneornil(L, 2)) {
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47 lua_settop(L, 0);
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48 lua_pushnil(L);
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49 return 1;
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50 } else {
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51 lua_pushvalue(L, 2);
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52 lua_replace(L, lua_upvalueindex(3));
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53 return lua_gettop(L);
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54 }
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55 }
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56
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57 static int seqlua_ipairs(lua_State *L) {
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58 luaL_checkany(L, 1); // provides better error message
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59 if (lua_type(L, 1) == LUA_TFUNCTION) {
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60 seqlua_ipairs_function:
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61 if (!lua_isnoneornil(L, 2) || !lua_isnoneornil(L, 3)) {
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62 lua_settop(L, 3);
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63 lua_pushinteger(L, 0);
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64 lua_pushcclosure(L, seqlua_ipairsaux_triplet, 4);
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65 return 1;
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66 }
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67 lua_pushcfunction(L, seqlua_ipairsaux_func);
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68 } else if (luaL_getmetafield(L, 1, "__call")) {
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69 lua_pop(L, 1);
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70 goto seqlua_ipairs_function;
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71 } else if (luaL_getmetafield(L, 1, "__index")) {
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72 lua_pushcfunction(L, seqlua_ipairsaux_meta);
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73 } else {
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74 luaL_checktype(L, 1, LUA_TTABLE);
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75 lua_pushcfunction(L, seqlua_ipairsaux_raw);
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76 }
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77 lua_pushvalue(L, 1);
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78 lua_pushinteger(L, 0);
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79 return 3;
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80 }
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81
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82 static int seqlua_iteratoraux_raw(lua_State *L) {
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83 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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84 lua_rawgeti(L, lua_upvalueindex(1), i);
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85 if (lua_isnil(L, -1)) return 1;
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86 lua_pushinteger(L, i);
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87 lua_replace(L, lua_upvalueindex(2));
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88 return 1;
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89 }
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90
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91 static int seqlua_iteratoraux_meta(lua_State *L) {
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92 lua_Integer i = lua_tointeger(L, lua_upvalueindex(2)) + 1;
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93 lua_pushinteger(L, i);
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94 lua_gettable(L, lua_upvalueindex(1));
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95 if (lua_isnil(L, -1)) return 1;
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96 lua_pushinteger(L, i);
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97 lua_replace(L, lua_upvalueindex(2));
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98 return 1;
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99 }
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100
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101 static int seqlua_iteratoraux_triplet(lua_State *L) {
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102 lua_settop(L, 0);
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103 lua_pushvalue(L, lua_upvalueindex(1));
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104 lua_pushvalue(L, lua_upvalueindex(2));
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105 lua_pushvalue(L, lua_upvalueindex(3));
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106 lua_call(L, 2, LUA_MULTRET);
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107 if (lua_isnoneornil(L, 1)) {
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108 lua_settop(L, 1);
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109 return 1;
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110 }
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111 lua_pushvalue(L, 1);
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112 lua_replace(L, lua_upvalueindex(3));
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113 return lua_gettop(L);
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114 }
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115
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116 int seqlua_iterator(lua_State *L) {
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117 luaL_checkany(L, 1); // provides better error message
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118 lua_settop(L, 3);
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119 if (lua_type(L, 1) == LUA_TFUNCTION) {
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120 seqlua_iterator_function:
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121 if (lua_isnil(L, 2) && lua_isnil(L, 3)) {
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122 lua_settop(L, 1);
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123 } else {
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124 lua_pushcclosure(L, seqlua_iteratoraux_triplet, 3);
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125 }
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126 } else if (luaL_getmetafield(L, 1, "__call")) {
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127 lua_pop(L, 1);
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128 goto seqlua_iterator_function;
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129 } else if (luaL_getmetafield(L, 1, "__index")) {
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130 lua_pushvalue(L, 1);
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131 lua_pushinteger(L, 0);
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132 lua_pushcclosure(L, seqlua_iteratoraux_meta, 2);
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133 } else {
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134 luaL_checktype(L, 1, LUA_TTABLE);
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135 lua_pushvalue(L, 1);
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136 lua_pushinteger(L, 0);
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137 lua_pushcclosure(L, seqlua_iteratoraux_raw, 2);
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138 }
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139 return 1;
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140 }
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141
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142 int luaopen_seqlua(lua_State *L) {
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143 lua_pushcfunction(L, seqlua_ipairs);
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144 lua_setglobal(L, "ipairs");
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145 lua_pushcfunction(L, seqlua_iterator);
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146 lua_setglobal(L, "iterator");
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147 return 1;
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148 }
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