[1129] | 1 | /* tolua: event functions |
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| 2 | ** Support code for Lua bindings. |
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| 3 | ** Written by Waldemar Celes |
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| 4 | ** TeCGraf/PUC-Rio |
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| 5 | ** Apr 2003 |
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| 6 | ** $Id: $ |
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| 7 | */ |
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| 8 | |
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| 9 | /* This code is free software; you can redistribute it and/or modify it. |
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| 10 | ** The software provided hereunder is on an "as is" basis, and |
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| 11 | ** the author has no obligation to provide maintenance, support, updates, |
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| 12 | ** enhancements, or modifications. |
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| 13 | */ |
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| 14 | |
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| 15 | #include <stdio.h> |
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| 16 | |
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| 17 | #include "tolua++.h" |
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| 18 | |
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| 19 | /* Store at ubox |
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| 20 | * It stores, creating the corresponding table if needed, |
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| 21 | * the pair key/value in the corresponding ubox table |
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| 22 | */ |
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| 23 | static void storeatubox (lua_State* L, int lo) |
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| 24 | { |
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| 25 | #ifdef LUA_VERSION_NUM |
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| 26 | lua_getfenv(L, lo); |
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| 27 | if (lua_rawequal(L, -1, TOLUA_NOPEER)) { |
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| 28 | lua_pop(L, 1); |
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| 29 | lua_newtable(L); |
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| 30 | lua_pushvalue(L, -1); |
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| 31 | lua_setfenv(L, lo); /* stack: k,v,table */ |
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| 32 | }; |
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| 33 | lua_insert(L, -3); |
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| 34 | lua_settable(L, -3); /* on lua 5.1, we trade the "tolua_peers" lookup for a settable call */ |
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| 35 | lua_pop(L, 1); |
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| 36 | #else |
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| 37 | /* stack: key value (to be stored) */ |
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| 38 | lua_pushstring(L,"tolua_peers"); |
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| 39 | lua_rawget(L,LUA_REGISTRYINDEX); /* stack: k v ubox */ |
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| 40 | lua_pushvalue(L,lo); |
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| 41 | lua_rawget(L,-2); /* stack: k v ubox ubox[u] */ |
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| 42 | if (!lua_istable(L,-1)) |
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| 43 | { |
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| 44 | lua_pop(L,1); /* stack: k v ubox */ |
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| 45 | lua_newtable(L); /* stack: k v ubox table */ |
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| 46 | lua_pushvalue(L,1); |
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| 47 | lua_pushvalue(L,-2); /* stack: k v ubox table u table */ |
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| 48 | lua_rawset(L,-4); /* stack: k v ubox ubox[u]=table */ |
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| 49 | } |
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| 50 | lua_insert(L,-4); /* put table before k */ |
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| 51 | lua_pop(L,1); /* pop ubox */ |
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| 52 | lua_rawset(L,-3); /* store at table */ |
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| 53 | lua_pop(L,1); /* pop ubox[u] */ |
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| 54 | #endif |
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| 55 | } |
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| 56 | |
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| 57 | /* Module index function |
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| 58 | */ |
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| 59 | static int module_index_event (lua_State* L) |
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| 60 | { |
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| 61 | lua_pushstring(L,".get"); |
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| 62 | lua_rawget(L,-3); |
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| 63 | if (lua_istable(L,-1)) |
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| 64 | { |
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| 65 | lua_pushvalue(L,2); /* key */ |
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| 66 | lua_rawget(L,-2); |
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| 67 | if (lua_iscfunction(L,-1)) |
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| 68 | { |
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| 69 | lua_call(L,0,1); |
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| 70 | return 1; |
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| 71 | } |
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| 72 | else if (lua_istable(L,-1)) |
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| 73 | return 1; |
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| 74 | } |
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| 75 | /* call old index meta event */ |
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| 76 | if (lua_getmetatable(L,1)) |
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| 77 | { |
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| 78 | lua_pushstring(L,"__index"); |
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| 79 | lua_rawget(L,-2); |
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| 80 | lua_pushvalue(L,1); |
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| 81 | lua_pushvalue(L,2); |
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| 82 | if (lua_isfunction(L,-1)) |
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| 83 | { |
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| 84 | lua_call(L,2,1); |
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| 85 | return 1; |
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| 86 | } |
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| 87 | else if (lua_istable(L,-1)) |
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| 88 | { |
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| 89 | lua_gettable(L,-3); |
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| 90 | return 1; |
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| 91 | } |
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| 92 | } |
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| 93 | lua_pushnil(L); |
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| 94 | return 1; |
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| 95 | } |
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| 96 | |
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| 97 | /* Module newindex function |
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| 98 | */ |
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| 99 | static int module_newindex_event (lua_State* L) |
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| 100 | { |
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| 101 | lua_pushstring(L,".set"); |
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| 102 | lua_rawget(L,-4); |
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| 103 | if (lua_istable(L,-1)) |
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| 104 | { |
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| 105 | lua_pushvalue(L,2); /* key */ |
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| 106 | lua_rawget(L,-2); |
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| 107 | if (lua_iscfunction(L,-1)) |
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| 108 | { |
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| 109 | lua_pushvalue(L,1); /* only to be compatible with non-static vars */ |
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| 110 | lua_pushvalue(L,3); /* value */ |
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| 111 | lua_call(L,2,0); |
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| 112 | return 0; |
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| 113 | } |
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| 114 | } |
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| 115 | /* call old newindex meta event */ |
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| 116 | if (lua_getmetatable(L,1) && lua_getmetatable(L,-1)) |
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| 117 | { |
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| 118 | lua_pushstring(L,"__newindex"); |
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| 119 | lua_rawget(L,-2); |
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| 120 | if (lua_isfunction(L,-1)) |
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| 121 | { |
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| 122 | lua_pushvalue(L,1); |
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| 123 | lua_pushvalue(L,2); |
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| 124 | lua_pushvalue(L,3); |
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| 125 | lua_call(L,3,0); |
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| 126 | } |
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| 127 | } |
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| 128 | lua_settop(L,3); |
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| 129 | lua_rawset(L,-3); |
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| 130 | return 0; |
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| 131 | } |
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| 132 | |
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| 133 | /* Class index function |
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| 134 | * If the object is a userdata (ie, an object), it searches the field in |
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| 135 | * the alternative table stored in the corresponding "ubox" table. |
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| 136 | */ |
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| 137 | static int class_index_event (lua_State* L) |
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| 138 | { |
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| 139 | int t = lua_type(L,1); |
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| 140 | if (t == LUA_TUSERDATA) |
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| 141 | { |
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| 142 | /* Access alternative table */ |
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| 143 | #ifdef LUA_VERSION_NUM /* new macro on version 5.1 */ |
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| 144 | lua_getfenv(L,1); |
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| 145 | if (!lua_rawequal(L, -1, TOLUA_NOPEER)) { |
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| 146 | lua_pushvalue(L, 2); /* key */ |
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| 147 | lua_gettable(L, -2); /* on lua 5.1, we trade the "tolua_peers" lookup for a gettable call */ |
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| 148 | if (!lua_isnil(L, -1)) |
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| 149 | return 1; |
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| 150 | }; |
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| 151 | #else |
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| 152 | lua_pushstring(L,"tolua_peers"); |
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| 153 | lua_rawget(L,LUA_REGISTRYINDEX); /* stack: obj key ubox */ |
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| 154 | lua_pushvalue(L,1); |
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| 155 | lua_rawget(L,-2); /* stack: obj key ubox ubox[u] */ |
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| 156 | if (lua_istable(L,-1)) |
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| 157 | { |
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| 158 | lua_pushvalue(L,2); /* key */ |
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| 159 | lua_rawget(L,-2); /* stack: obj key ubox ubox[u] value */ |
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| 160 | if (!lua_isnil(L,-1)) |
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| 161 | return 1; |
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| 162 | } |
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| 163 | #endif |
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| 164 | lua_settop(L,2); /* stack: obj key */ |
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| 165 | /* Try metatables */ |
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| 166 | lua_pushvalue(L,1); /* stack: obj key obj */ |
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| 167 | while (lua_getmetatable(L,-1)) |
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| 168 | { /* stack: obj key obj mt */ |
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| 169 | lua_remove(L,-2); /* stack: obj key mt */ |
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| 170 | if (lua_isnumber(L,2)) /* check if key is a numeric value */ |
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| 171 | { |
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| 172 | /* try operator[] */ |
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| 173 | lua_pushstring(L,".geti"); |
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| 174 | lua_rawget(L,-2); /* stack: obj key mt func */ |
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| 175 | if (lua_isfunction(L,-1)) |
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| 176 | { |
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| 177 | lua_pushvalue(L,1); |
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| 178 | lua_pushvalue(L,2); |
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| 179 | lua_call(L,2,1); |
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| 180 | return 1; |
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| 181 | } |
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| 182 | } |
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| 183 | else |
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| 184 | { |
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| 185 | lua_pushvalue(L,2); /* stack: obj key mt key */ |
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| 186 | lua_rawget(L,-2); /* stack: obj key mt value */ |
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| 187 | if (!lua_isnil(L,-1)) |
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| 188 | return 1; |
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| 189 | else |
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| 190 | lua_pop(L,1); |
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| 191 | /* try C/C++ variable */ |
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| 192 | lua_pushstring(L,".get"); |
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| 193 | lua_rawget(L,-2); /* stack: obj key mt tget */ |
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| 194 | if (lua_istable(L,-1)) |
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| 195 | { |
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| 196 | lua_pushvalue(L,2); |
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| 197 | lua_rawget(L,-2); /* stack: obj key mt value */ |
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| 198 | if (lua_iscfunction(L,-1)) |
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| 199 | { |
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| 200 | lua_pushvalue(L,1); |
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| 201 | lua_pushvalue(L,2); |
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| 202 | lua_call(L,2,1); |
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| 203 | return 1; |
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| 204 | } |
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| 205 | else if (lua_istable(L,-1)) |
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| 206 | { |
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| 207 | /* deal with array: create table to be returned and cache it in ubox */ |
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| 208 | void* u = *((void**)lua_touserdata(L,1)); |
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| 209 | lua_newtable(L); /* stack: obj key mt value table */ |
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| 210 | lua_pushstring(L,".self"); |
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| 211 | lua_pushlightuserdata(L,u); |
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| 212 | lua_rawset(L,-3); /* store usertype in ".self" */ |
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| 213 | lua_insert(L,-2); /* stack: obj key mt table value */ |
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| 214 | lua_setmetatable(L,-2); /* set stored value as metatable */ |
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| 215 | lua_pushvalue(L,-1); /* stack: obj key met table table */ |
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| 216 | lua_pushvalue(L,2); /* stack: obj key mt table table key */ |
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| 217 | lua_insert(L,-2); /* stack: obj key mt table key table */ |
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| 218 | storeatubox(L,1); /* stack: obj key mt table */ |
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| 219 | return 1; |
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| 220 | } |
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| 221 | } |
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| 222 | } |
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| 223 | lua_settop(L,3); |
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| 224 | } |
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| 225 | lua_pushnil(L); |
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| 226 | return 1; |
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| 227 | } |
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| 228 | else if (t== LUA_TTABLE) |
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| 229 | { |
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| 230 | module_index_event(L); |
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| 231 | return 1; |
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| 232 | } |
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| 233 | lua_pushnil(L); |
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| 234 | return 1; |
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| 235 | } |
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| 236 | |
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| 237 | /* Newindex function |
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| 238 | * It first searches for a C/C++ varaible to be set. |
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| 239 | * Then, it either stores it in the alternative ubox table (in the case it is |
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| 240 | * an object) or in the own table (that represents the class or module). |
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| 241 | */ |
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| 242 | static int class_newindex_event (lua_State* L) |
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| 243 | { |
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| 244 | int t = lua_type(L,1); |
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| 245 | if (t == LUA_TUSERDATA) |
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| 246 | { |
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| 247 | /* Try accessing a C/C++ variable to be set */ |
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| 248 | lua_getmetatable(L,1); |
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| 249 | while (lua_istable(L,-1)) /* stack: t k v mt */ |
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| 250 | { |
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| 251 | if (lua_isnumber(L,2)) /* check if key is a numeric value */ |
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| 252 | { |
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| 253 | /* try operator[] */ |
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| 254 | lua_pushstring(L,".seti"); |
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| 255 | lua_rawget(L,-2); /* stack: obj key mt func */ |
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| 256 | if (lua_isfunction(L,-1)) |
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| 257 | { |
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| 258 | lua_pushvalue(L,1); |
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| 259 | lua_pushvalue(L,2); |
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| 260 | lua_pushvalue(L,3); |
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| 261 | lua_call(L,3,0); |
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| 262 | return 0; |
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| 263 | } |
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| 264 | } |
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| 265 | else |
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| 266 | { |
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| 267 | lua_pushstring(L,".set"); |
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| 268 | lua_rawget(L,-2); /* stack: t k v mt tset */ |
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| 269 | if (lua_istable(L,-1)) |
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| 270 | { |
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| 271 | lua_pushvalue(L,2); |
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| 272 | lua_rawget(L,-2); /* stack: t k v mt tset func */ |
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| 273 | if (lua_iscfunction(L,-1)) |
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| 274 | { |
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| 275 | lua_pushvalue(L,1); |
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| 276 | lua_pushvalue(L,3); |
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| 277 | lua_call(L,2,0); |
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| 278 | return 0; |
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| 279 | } |
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| 280 | lua_pop(L,1); /* stack: t k v mt tset */ |
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| 281 | } |
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| 282 | lua_pop(L,1); /* stack: t k v mt */ |
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| 283 | if (!lua_getmetatable(L,-1)) /* stack: t k v mt mt */ |
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| 284 | lua_pushnil(L); |
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| 285 | lua_remove(L,-2); /* stack: t k v mt */ |
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| 286 | } |
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| 287 | } |
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| 288 | lua_settop(L,3); /* stack: t k v */ |
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| 289 | |
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| 290 | /* then, store as a new field */ |
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| 291 | storeatubox(L,1); |
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| 292 | } |
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| 293 | else if (t== LUA_TTABLE) |
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| 294 | { |
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| 295 | module_newindex_event(L); |
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| 296 | } |
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| 297 | return 0; |
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| 298 | } |
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| 299 | |
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| 300 | static int class_call_event(lua_State* L) { |
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| 301 | |
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| 302 | if (lua_istable(L, 1)) { |
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| 303 | lua_pushstring(L, ".call"); |
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| 304 | lua_rawget(L, 1); |
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| 305 | if (lua_isfunction(L, -1)) { |
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| 306 | |
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| 307 | lua_insert(L, 1); |
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| 308 | lua_call(L, lua_gettop(L)-1, 1); |
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| 309 | |
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| 310 | return 1; |
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| 311 | }; |
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| 312 | }; |
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| 313 | tolua_error(L,"Attempt to call a non-callable object.",NULL); |
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| 314 | return 0; |
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| 315 | }; |
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| 316 | |
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| 317 | static int do_operator (lua_State* L, const char* op) |
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| 318 | { |
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| 319 | if (lua_isuserdata(L,1)) |
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| 320 | { |
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| 321 | /* Try metatables */ |
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| 322 | lua_pushvalue(L,1); /* stack: op1 op2 */ |
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| 323 | while (lua_getmetatable(L,-1)) |
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| 324 | { /* stack: op1 op2 op1 mt */ |
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| 325 | lua_remove(L,-2); /* stack: op1 op2 mt */ |
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| 326 | lua_pushstring(L,op); /* stack: op1 op2 mt key */ |
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| 327 | lua_rawget(L,-2); /* stack: obj key mt func */ |
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| 328 | if (lua_isfunction(L,-1)) |
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| 329 | { |
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| 330 | lua_pushvalue(L,1); |
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| 331 | lua_pushvalue(L,2); |
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| 332 | lua_call(L,2,1); |
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| 333 | return 1; |
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| 334 | } |
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| 335 | lua_settop(L,3); |
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| 336 | } |
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| 337 | } |
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| 338 | tolua_error(L,"Attempt to perform operation on an invalid operand",NULL); |
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| 339 | return 0; |
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| 340 | } |
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| 341 | |
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| 342 | static int class_add_event (lua_State* L) |
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| 343 | { |
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| 344 | return do_operator(L,".add"); |
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| 345 | } |
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| 346 | |
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| 347 | static int class_sub_event (lua_State* L) |
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| 348 | { |
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| 349 | return do_operator(L,".sub"); |
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| 350 | } |
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| 351 | |
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| 352 | static int class_mul_event (lua_State* L) |
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| 353 | { |
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| 354 | return do_operator(L,".mul"); |
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| 355 | } |
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| 356 | |
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| 357 | static int class_div_event (lua_State* L) |
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| 358 | { |
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| 359 | return do_operator(L,".div"); |
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| 360 | } |
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| 361 | |
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| 362 | static int class_lt_event (lua_State* L) |
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| 363 | { |
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| 364 | return do_operator(L,".lt"); |
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| 365 | } |
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| 366 | |
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| 367 | static int class_le_event (lua_State* L) |
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| 368 | { |
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| 369 | return do_operator(L,".le"); |
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| 370 | } |
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| 371 | |
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| 372 | static int class_eq_event (lua_State* L) |
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| 373 | { |
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| 374 | return do_operator(L,".eq"); |
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| 375 | } |
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| 376 | |
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| 377 | /* |
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| 378 | static int class_gc_event (lua_State* L) |
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| 379 | { |
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| 380 | void* u = *((void**)lua_touserdata(L,1)); |
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| 381 | fprintf(stderr, "collecting: looking at %p\n", u); |
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| 382 | lua_pushstring(L,"tolua_gc"); |
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| 383 | lua_rawget(L,LUA_REGISTRYINDEX); |
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| 384 | lua_pushlightuserdata(L,u); |
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| 385 | lua_rawget(L,-2); |
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| 386 | if (lua_isfunction(L,-1)) |
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| 387 | { |
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| 388 | lua_pushvalue(L,1); |
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| 389 | lua_call(L,1,0); |
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| 390 | lua_pushlightuserdata(L,u); |
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| 391 | lua_pushnil(L); |
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| 392 | lua_rawset(L,-3); |
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| 393 | } |
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| 394 | lua_pop(L,2); |
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| 395 | return 0; |
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| 396 | } |
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| 397 | */ |
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| 398 | TOLUA_API int class_gc_event (lua_State* L) |
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| 399 | { |
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| 400 | void* u = *((void**)lua_touserdata(L,1)); |
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| 401 | int top; |
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| 402 | /*fprintf(stderr, "collecting: looking at %p\n", u);*/ |
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| 403 | /* |
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| 404 | lua_pushstring(L,"tolua_gc"); |
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| 405 | lua_rawget(L,LUA_REGISTRYINDEX); |
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| 406 | */ |
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| 407 | lua_pushvalue(L, lua_upvalueindex(1)); |
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| 408 | lua_pushlightuserdata(L,u); |
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| 409 | lua_rawget(L,-2); /* stack: gc umt */ |
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| 410 | lua_getmetatable(L,1); /* stack: gc umt mt */ |
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| 411 | /*fprintf(stderr, "checking type\n");*/ |
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| 412 | top = lua_gettop(L); |
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| 413 | if (tolua_fast_isa(L,top,top-1, lua_upvalueindex(2))) /* make sure we collect correct type */ |
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| 414 | { |
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| 415 | /*fprintf(stderr, "Found type!\n");*/ |
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| 416 | /* get gc function */ |
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| 417 | lua_pushliteral(L,".collector"); |
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| 418 | lua_rawget(L,-2); /* stack: gc umt mt collector */ |
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| 419 | if (lua_isfunction(L,-1)) { |
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| 420 | /*fprintf(stderr, "Found .collector!\n");*/ |
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| 421 | } |
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| 422 | else { |
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| 423 | lua_pop(L,1); |
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| 424 | /*fprintf(stderr, "Using default cleanup\n");*/ |
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| 425 | lua_pushcfunction(L,tolua_default_collect); |
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| 426 | } |
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| 427 | |
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| 428 | lua_pushvalue(L,1); /* stack: gc umt mt collector u */ |
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| 429 | lua_call(L,1,0); |
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| 430 | |
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| 431 | lua_pushlightuserdata(L,u); /* stack: gc umt mt u */ |
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| 432 | lua_pushnil(L); /* stack: gc umt mt u nil */ |
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| 433 | lua_rawset(L,-5); /* stack: gc umt mt */ |
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| 434 | } |
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| 435 | lua_pop(L,3); |
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| 436 | return 0; |
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| 437 | } |
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| 438 | |
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| 439 | |
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| 440 | /* Register module events |
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| 441 | * It expects the metatable on the top of the stack |
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| 442 | */ |
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| 443 | TOLUA_API void tolua_moduleevents (lua_State* L) |
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| 444 | { |
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| 445 | lua_pushstring(L,"__index"); |
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| 446 | lua_pushcfunction(L,module_index_event); |
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| 447 | lua_rawset(L,-3); |
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| 448 | lua_pushstring(L,"__newindex"); |
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| 449 | lua_pushcfunction(L,module_newindex_event); |
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| 450 | lua_rawset(L,-3); |
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| 451 | } |
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| 452 | |
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| 453 | /* Check if the object on the top has a module metatable |
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| 454 | */ |
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| 455 | TOLUA_API int tolua_ismodulemetatable (lua_State* L) |
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| 456 | { |
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| 457 | int r = 0; |
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| 458 | if (lua_getmetatable(L,-1)) |
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| 459 | { |
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| 460 | lua_pushstring(L,"__index"); |
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| 461 | lua_rawget(L,-2); |
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| 462 | r = (lua_tocfunction(L,-1) == module_index_event); |
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| 463 | lua_pop(L,2); |
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| 464 | } |
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| 465 | return r; |
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| 466 | } |
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| 467 | |
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| 468 | /* Register class events |
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| 469 | * It expects the metatable on the top of the stack |
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| 470 | */ |
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| 471 | TOLUA_API void tolua_classevents (lua_State* L) |
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| 472 | { |
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| 473 | lua_pushstring(L,"__index"); |
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| 474 | lua_pushcfunction(L,class_index_event); |
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| 475 | lua_rawset(L,-3); |
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| 476 | lua_pushstring(L,"__newindex"); |
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| 477 | lua_pushcfunction(L,class_newindex_event); |
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| 478 | lua_rawset(L,-3); |
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| 479 | |
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| 480 | lua_pushstring(L,"__add"); |
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| 481 | lua_pushcfunction(L,class_add_event); |
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| 482 | lua_rawset(L,-3); |
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| 483 | lua_pushstring(L,"__sub"); |
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| 484 | lua_pushcfunction(L,class_sub_event); |
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| 485 | lua_rawset(L,-3); |
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| 486 | lua_pushstring(L,"__mul"); |
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| 487 | lua_pushcfunction(L,class_mul_event); |
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| 488 | lua_rawset(L,-3); |
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| 489 | lua_pushstring(L,"__div"); |
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| 490 | lua_pushcfunction(L,class_div_event); |
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| 491 | lua_rawset(L,-3); |
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| 492 | |
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| 493 | lua_pushstring(L,"__lt"); |
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| 494 | lua_pushcfunction(L,class_lt_event); |
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| 495 | lua_rawset(L,-3); |
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| 496 | lua_pushstring(L,"__le"); |
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| 497 | lua_pushcfunction(L,class_le_event); |
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| 498 | lua_rawset(L,-3); |
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| 499 | lua_pushstring(L,"__eq"); |
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| 500 | lua_pushcfunction(L,class_eq_event); |
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| 501 | lua_rawset(L,-3); |
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| 502 | |
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| 503 | lua_pushstring(L,"__call"); |
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| 504 | lua_pushcfunction(L,class_call_event); |
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| 505 | lua_rawset(L,-3); |
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| 506 | |
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| 507 | lua_pushstring(L,"__gc"); |
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| 508 | lua_pushstring(L, "tolua_gc_event"); |
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| 509 | lua_rawget(L, LUA_REGISTRYINDEX); |
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| 510 | /*lua_pushcfunction(L,class_gc_event);*/ |
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| 511 | lua_rawset(L,-3); |
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| 512 | } |
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| 513 | |
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