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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 static int seqlua_ipairsaux_raw(lua_State *L) {
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6 lua_Integer i;
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7 luaL_checktype(L, 1, LUA_TTABLE);
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8 i = luaL_checkinteger(L, 2) + 1;
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9 lua_pushinteger(L, i);
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10 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
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11 return lua_isnil(L, -1) ? 1 : 2;
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12 }
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13
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14 static int seqlua_ipairsaux_meta(lua_State *L) {
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15 lua_Integer i;
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16 i = luaL_checkinteger(L, 2) + 1;
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17 lua_pushinteger(L, i);
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18 lua_pushinteger(L, i);
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19 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
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20 return lua_isnil(L, -1) ? 1 : 2;
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21 }
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22
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23 static int seqlua_ipairsaux_func(lua_State *L) {
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24 luaL_checktype(L, 1, LUA_TFUNCTION);
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25 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
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26 lua_insert(L, 1);
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27 lua_settop(L, 2);
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28 lua_call(L, 0, LUA_MULTRET);
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29 if (lua_isnoneornil(L, 2)) {
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30 lua_settop(L, 0);
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31 lua_pushnil(L);
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32 return 1;
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33 } else {
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34 return lua_gettop(L);
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35 }
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36 }
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37
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38 static int seqlua_ipairsaux_funcclosure(lua_State *L) {
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39 lua_Integer i = lua_tointeger(L, lua_upvalueindex(4)) + 1;
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40 lua_settop(L, 0);
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41 lua_pushinteger(L, i);
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42 lua_replace(L, lua_upvalueindex(4));
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43 lua_pushinteger(L, i);
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44 lua_pushvalue(L, lua_upvalueindex(1));
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45 lua_pushvalue(L, lua_upvalueindex(2));
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46 lua_pushvalue(L, lua_upvalueindex(3));
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47 lua_call(L, 2, LUA_MULTRET);
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48 if (lua_isnoneornil(L, 2)) {
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49 lua_settop(L, 0);
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50 lua_pushnil(L);
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51 return 1;
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52 } else {
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53 lua_pushvalue(L, 2);
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54 lua_replace(L, lua_upvalueindex(3));
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55 return lua_gettop(L);
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56 }
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57 }
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58
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59 static int seqlua_ipairs(lua_State *L) {
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60 if (luaL_getmetafield(L, 1, "__call")) {
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61 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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62 lua_replace(L, 1);
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63 }
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64 if (lua_type(L, 1) == LUA_TFUNCTION) {
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65 if (!lua_isnoneornil(L, 2) || !lua_isnoneornil(L, 3)) {
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66 lua_settop(L, 3);
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67 lua_pushinteger(L, 0);
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68 lua_pushcclosure(L, seqlua_ipairsaux_funcclosure, 4);
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69 return 1;
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70 }
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71 lua_pushcfunction(L, seqlua_ipairsaux_func);
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72 } else if (luaL_getmetafield(L, 1, "__index")) {
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73 lua_pushcfunction(L, seqlua_ipairsaux_meta);
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74 } else {
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75 luaL_checktype(L, 1, LUA_TTABLE);
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76 lua_pushcfunction(L, seqlua_ipairsaux_raw);
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77 }
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78 lua_pushvalue(L, 1);
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79 lua_pushinteger(L, 0);
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80 return 3;
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81 }
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82
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83 static int seqlua_iteratoraux(lua_State *L) {
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84 lua_settop(L, 0);
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85 lua_pushvalue(L, lua_upvalueindex(1));
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86 lua_pushvalue(L, lua_upvalueindex(2));
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87 lua_pushvalue(L, lua_upvalueindex(3));
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88 lua_call(L, 2, LUA_MULTRET);
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89 if (lua_isnoneornil(L, 1)) {
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90 lua_settop(L, 1);
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91 return 1;
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92 }
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93 lua_pushvalue(L, 1);
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94 lua_replace(L, lua_upvalueindex(3));
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95 return lua_gettop(L);
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96 }
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97
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98 static int seqlua_iterator(lua_State *L) {
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99 if (luaL_getmetafield(L, 1, "__call")) {
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100 if (lua_type(L, -1) != LUA_TFUNCTION) luaL_error(L, "__call is not a function");
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101 lua_replace(L, 1);
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102 }
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103 if (lua_type(L, 1) == LUA_TFUNCTION) {
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104 if (lua_isnoneornil(L, 2) && lua_isnoneornil(L, 3)) {
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105 lua_settop(L, 1);
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106 } else {
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107 lua_settop(L, 3);
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108 lua_pushcclosure(L, seqlua_iteratoraux, 3);
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109 }
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110 } else {
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111 seqlua_iterclosure(L, 1);
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112 lua_settop(L, 1);
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113 }
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114 return 1;
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115 }
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116
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117 int luaopen_seqlua(lua_State *L) {
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118 lua_pushcfunction(L, seqlua_ipairs);
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119 lua_setglobal(L, "ipairs");
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120 lua_pushcfunction(L, seqlua_iterator);
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121 lua_setglobal(L, "iterator");
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122 return 1;
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123 }
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