1 | /* tolua: functions to map features |
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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 "tolua++.h" |
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16 | #include "tolua_event.h" |
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17 | #include "lauxlib.h" |
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18 | |
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19 | #include <string.h> |
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20 | #include <stdio.h> |
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21 | #include <stdlib.h> |
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22 | #include <math.h> |
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23 | |
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24 | |
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25 | /* Create metatable |
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26 | * Create and register new metatable |
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27 | */ |
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28 | static int tolua_newmetatable (lua_State* L, char* name) |
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29 | { |
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30 | int r = luaL_newmetatable(L,name); |
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31 | |
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32 | #ifdef LUA_VERSION_NUM /* only lua 5.1 */ |
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33 | if (r) { |
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34 | lua_pushvalue(L, -1); |
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35 | lua_pushstring(L, name); |
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36 | lua_settable(L, LUA_REGISTRYINDEX); /* reg[mt] = type_name */ |
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37 | }; |
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38 | #endif |
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39 | |
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40 | if (r) |
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41 | tolua_classevents(L); /* set meta events */ |
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42 | lua_pop(L,1); |
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43 | return r; |
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44 | } |
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45 | |
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46 | /* Map super classes |
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47 | * It sets 'name' as being also a 'base', mapping all super classes of 'base' in 'name' |
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48 | */ |
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49 | static void mapsuper (lua_State* L, const char* name, const char* base) |
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50 | { |
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51 | /* push registry.super */ |
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52 | lua_pushstring(L,"tolua_super"); |
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53 | lua_rawget(L,LUA_REGISTRYINDEX); /* stack: super */ |
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54 | luaL_getmetatable(L,name); /* stack: super mt */ |
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55 | lua_rawget(L,-2); /* stack: super table */ |
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56 | if (lua_isnil(L,-1)) |
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57 | { |
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58 | /* create table */ |
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59 | lua_pop(L,1); |
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60 | lua_newtable(L); /* stack: super table */ |
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61 | luaL_getmetatable(L,name); /* stack: super table mt */ |
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62 | lua_pushvalue(L,-2); /* stack: super table mt table */ |
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63 | lua_rawset(L,-4); /* stack: super table */ |
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64 | } |
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65 | |
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66 | /* set base as super class */ |
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67 | lua_pushstring(L,base); |
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68 | lua_pushboolean(L,1); |
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69 | lua_rawset(L,-3); /* stack: super table */ |
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70 | |
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71 | /* set all super class of base as super class of name */ |
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72 | luaL_getmetatable(L,base); /* stack: super table base_mt */ |
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73 | lua_rawget(L,-3); /* stack: super table base_table */ |
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74 | if (lua_istable(L,-1)) |
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75 | { |
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76 | /* traverse base table */ |
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77 | lua_pushnil(L); /* first key */ |
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78 | while (lua_next(L,-2) != 0) |
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79 | { |
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80 | /* stack: ... base_table key value */ |
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81 | lua_pushvalue(L,-2); /* stack: ... base_table key value key */ |
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82 | lua_insert(L,-2); /* stack: ... base_table key key value */ |
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83 | lua_rawset(L,-5); /* stack: ... base_table key */ |
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84 | } |
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85 | } |
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86 | lua_pop(L,3); /* stack: <empty> */ |
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87 | } |
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88 | |
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89 | /* creates a 'tolua_ubox' table for base clases, and |
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90 | // expects the metatable and base metatable on the stack */ |
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91 | static void set_ubox(lua_State* L) { |
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92 | |
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93 | /* mt basemt */ |
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94 | if (!lua_isnil(L, -1)) { |
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95 | lua_pushstring(L, "tolua_ubox"); |
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96 | lua_rawget(L,-2); |
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97 | } else { |
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98 | lua_pushnil(L); |
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99 | }; |
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100 | /* mt basemt base_ubox */ |
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101 | if (!lua_isnil(L,-1)) { |
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102 | lua_pushstring(L, "tolua_ubox"); |
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103 | lua_insert(L, -2); |
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104 | /* mt basemt key ubox */ |
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105 | lua_rawset(L,-4); |
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106 | /* (mt with ubox) basemt */ |
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107 | } else { |
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108 | /* mt basemt nil */ |
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109 | lua_pop(L, 1); |
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110 | lua_pushstring(L,"tolua_ubox"); lua_newtable(L); |
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111 | /* make weak value metatable for ubox table to allow userdata to be |
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112 | garbage-collected */ |
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113 | lua_newtable(L); lua_pushliteral(L, "__mode"); lua_pushliteral(L, "v"); lua_rawset(L, -3); /* stack: string ubox mt */ |
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114 | lua_setmetatable(L, -2); /* stack:mt basemt string ubox */ |
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115 | lua_rawset(L,-4); |
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116 | }; |
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117 | |
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118 | }; |
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119 | |
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120 | /* Map inheritance |
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121 | * It sets 'name' as derived from 'base' by setting 'base' as metatable of 'name' |
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122 | */ |
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123 | static void mapinheritance (lua_State* L, const char* name, const char* base) |
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124 | { |
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125 | /* set metatable inheritance */ |
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126 | luaL_getmetatable(L,name); |
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127 | |
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128 | if (base && *base) |
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129 | luaL_getmetatable(L,base); |
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130 | else { |
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131 | |
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132 | if (lua_getmetatable(L, -1)) { /* already has a mt, we don't overwrite it */ |
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133 | lua_pop(L, 2); |
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134 | return; |
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135 | }; |
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136 | luaL_getmetatable(L,"tolua_commonclass"); |
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137 | }; |
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138 | |
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139 | set_ubox(L); |
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140 | |
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141 | lua_setmetatable(L,-2); |
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142 | lua_pop(L,1); |
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143 | } |
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144 | |
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145 | /* Object type |
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146 | */ |
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147 | static int tolua_bnd_type (lua_State* L) |
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148 | { |
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149 | tolua_typename(L,lua_gettop(L)); |
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150 | return 1; |
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151 | } |
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152 | |
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153 | /* Take ownership |
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154 | */ |
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155 | static int tolua_bnd_takeownership (lua_State* L) |
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156 | { |
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157 | int success = 0; |
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158 | if (lua_isuserdata(L,1)) |
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159 | { |
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160 | if (lua_getmetatable(L,1)) /* if metatable? */ |
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161 | { |
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162 | lua_pop(L,1); /* clear metatable off stack */ |
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163 | /* force garbage collection to avoid C to reuse a to-be-collected address */ |
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164 | #ifdef LUA_VERSION_NUM |
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165 | lua_gc(L, LUA_GCCOLLECT, 0); |
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166 | #else |
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167 | lua_setgcthreshold(L,0); |
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168 | #endif |
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169 | |
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170 | success = tolua_register_gc(L,1); |
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171 | } |
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172 | } |
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173 | lua_pushboolean(L,success!=0); |
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174 | return 1; |
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175 | } |
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176 | |
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177 | /* Release ownership |
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178 | */ |
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179 | static int tolua_bnd_releaseownership (lua_State* L) |
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180 | { |
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181 | int done = 0; |
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182 | if (lua_isuserdata(L,1)) |
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183 | { |
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184 | void* u = *((void**)lua_touserdata(L,1)); |
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185 | /* force garbage collection to avoid releasing a to-be-collected address */ |
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186 | #ifdef LUA_VERSION_NUM |
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187 | lua_gc(L, LUA_GCCOLLECT, 0); |
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188 | #else |
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189 | lua_setgcthreshold(L,0); |
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190 | #endif |
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191 | lua_pushstring(L,"tolua_gc"); |
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192 | lua_rawget(L,LUA_REGISTRYINDEX); |
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193 | lua_pushlightuserdata(L,u); |
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194 | lua_rawget(L,-2); |
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195 | lua_getmetatable(L,1); |
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196 | if (lua_rawequal(L,-1,-2)) /* check that we are releasing the correct type */ |
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197 | { |
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198 | lua_pushlightuserdata(L,u); |
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199 | lua_pushnil(L); |
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200 | lua_rawset(L,-5); |
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201 | done = 1; |
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202 | } |
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203 | } |
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204 | lua_pushboolean(L,done!=0); |
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205 | return 1; |
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206 | } |
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207 | |
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208 | /* Type casting |
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209 | */ |
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210 | static int tolua_bnd_cast (lua_State* L) |
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211 | { |
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212 | |
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213 | /* // old code |
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214 | void* v = tolua_tousertype(L,1,NULL); |
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215 | const char* s = tolua_tostring(L,2,NULL); |
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216 | if (v && s) |
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217 | tolua_pushusertype(L,v,s); |
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218 | else |
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219 | lua_pushnil(L); |
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220 | return 1; |
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221 | */ |
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222 | |
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223 | void* v; |
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224 | const char* s; |
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225 | if (lua_islightuserdata(L, 1)) { |
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226 | v = tolua_touserdata(L, 1, NULL); |
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227 | } else { |
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228 | v = tolua_tousertype(L, 1, 0); |
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229 | }; |
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230 | |
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231 | s = tolua_tostring(L,2,NULL); |
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232 | if (v && s) |
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233 | tolua_pushusertype(L,v,s); |
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234 | else |
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235 | lua_pushnil(L); |
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236 | return 1; |
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237 | } |
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238 | |
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239 | /* Inheritance |
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240 | */ |
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241 | static int tolua_bnd_inherit (lua_State* L) { |
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242 | |
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243 | /* stack: lua object, c object */ |
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244 | lua_pushstring(L, ".c_instance"); |
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245 | lua_pushvalue(L, -2); |
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246 | lua_rawset(L, -4); |
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247 | /* l_obj[".c_instance"] = c_obj */ |
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248 | |
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249 | return 0; |
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250 | }; |
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251 | |
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252 | #ifdef LUA_VERSION_NUM /* lua 5.1 */ |
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253 | static int tolua_bnd_setpeer(lua_State* L) { |
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254 | |
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255 | /* stack: userdata, table */ |
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256 | if (!lua_isuserdata(L, -2)) { |
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257 | lua_pushstring(L, "Invalid argument #1 to setpeer: userdata expected."); |
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258 | lua_error(L); |
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259 | }; |
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260 | |
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261 | if (lua_isnil(L, -1)) { |
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262 | |
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263 | lua_pop(L, 1); |
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264 | lua_pushvalue(L, TOLUA_NOPEER); |
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265 | }; |
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266 | lua_setfenv(L, -2); |
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267 | |
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268 | return 0; |
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269 | }; |
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270 | |
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271 | static int tolua_bnd_getpeer(lua_State* L) { |
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272 | |
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273 | /* stack: userdata */ |
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274 | lua_getfenv(L, -1); |
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275 | if (lua_rawequal(L, -1, TOLUA_NOPEER)) { |
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276 | lua_pop(L, 1); |
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277 | lua_pushnil(L); |
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278 | }; |
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279 | return 1; |
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280 | }; |
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281 | #endif |
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282 | |
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283 | /* static int class_gc_event (lua_State* L); */ |
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284 | |
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285 | TOLUA_API void tolua_open (lua_State* L) |
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286 | { |
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287 | int top = lua_gettop(L); |
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288 | lua_pushstring(L,"tolua_opened"); |
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289 | lua_rawget(L,LUA_REGISTRYINDEX); |
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290 | if (!lua_isboolean(L,-1)) |
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291 | { |
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292 | lua_pushstring(L,"tolua_opened"); lua_pushboolean(L,1); lua_rawset(L,LUA_REGISTRYINDEX); |
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293 | |
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294 | #ifndef LUA_VERSION_NUM /* only prior to lua 5.1 */ |
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295 | /* create peer object table */ |
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296 | lua_pushstring(L, "tolua_peers"); lua_newtable(L); |
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297 | /* make weak key metatable for peers indexed by userdata object */ |
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298 | lua_newtable(L); lua_pushliteral(L, "__mode"); lua_pushliteral(L, "k"); lua_rawset(L, -3); /* stack: string peers mt */ |
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299 | lua_setmetatable(L, -2); /* stack: string peers */ |
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300 | lua_rawset(L,LUA_REGISTRYINDEX); |
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301 | #endif |
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302 | |
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303 | /* create object ptr -> udata mapping table */ |
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304 | lua_pushstring(L,"tolua_ubox"); lua_newtable(L); |
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305 | /* make weak value metatable for ubox table to allow userdata to be |
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306 | garbage-collected */ |
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307 | lua_newtable(L); lua_pushliteral(L, "__mode"); lua_pushliteral(L, "v"); lua_rawset(L, -3); /* stack: string ubox mt */ |
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308 | lua_setmetatable(L, -2); /* stack: string ubox */ |
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309 | lua_rawset(L,LUA_REGISTRYINDEX); |
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310 | |
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311 | lua_pushstring(L,"tolua_super"); lua_newtable(L); lua_rawset(L,LUA_REGISTRYINDEX); |
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312 | lua_pushstring(L,"tolua_gc"); lua_newtable(L);lua_rawset(L,LUA_REGISTRYINDEX); |
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313 | |
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314 | /* create gc_event closure */ |
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315 | lua_pushstring(L, "tolua_gc_event"); |
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316 | lua_pushstring(L, "tolua_gc"); |
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317 | lua_rawget(L, LUA_REGISTRYINDEX); |
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318 | lua_pushstring(L, "tolua_super"); |
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319 | lua_rawget(L, LUA_REGISTRYINDEX); |
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320 | lua_pushcclosure(L, class_gc_event, 2); |
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321 | lua_rawset(L, LUA_REGISTRYINDEX); |
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322 | |
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323 | tolua_newmetatable(L,"tolua_commonclass"); |
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324 | |
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325 | tolua_module(L,NULL,0); |
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326 | tolua_beginmodule(L,NULL); |
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327 | tolua_module(L,"tolua",0); |
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328 | tolua_beginmodule(L,"tolua"); |
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329 | tolua_function(L,"type",tolua_bnd_type); |
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330 | tolua_function(L,"takeownership",tolua_bnd_takeownership); |
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331 | tolua_function(L,"releaseownership",tolua_bnd_releaseownership); |
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332 | tolua_function(L,"cast",tolua_bnd_cast); |
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333 | tolua_function(L,"inherit", tolua_bnd_inherit); |
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334 | #ifdef LUA_VERSION_NUM /* lua 5.1 */ |
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335 | tolua_function(L, "setpeer", tolua_bnd_setpeer); |
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336 | tolua_function(L, "getpeer", tolua_bnd_getpeer); |
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337 | #endif |
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338 | |
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339 | tolua_endmodule(L); |
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340 | tolua_endmodule(L); |
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341 | } |
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342 | lua_settop(L,top); |
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343 | } |
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344 | |
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345 | /* Copy a C object |
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346 | */ |
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347 | TOLUA_API void* tolua_copy (lua_State* L, void* value, unsigned int size) |
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348 | { |
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349 | void* clone = (void*)malloc(size); |
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350 | if (clone) |
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351 | memcpy(clone,value,size); |
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352 | else |
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353 | tolua_error(L,"insuficient memory",NULL); |
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354 | return clone; |
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355 | } |
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356 | |
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357 | /* Default collect function |
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358 | */ |
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359 | TOLUA_API int tolua_default_collect (lua_State* tolua_S) |
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360 | { |
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361 | void* self = tolua_tousertype(tolua_S,1,0); |
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362 | free(self); |
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363 | return 0; |
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364 | } |
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365 | |
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366 | /* Do clone |
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367 | */ |
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368 | TOLUA_API int tolua_register_gc (lua_State* L, int lo) |
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369 | { |
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370 | int success = 1; |
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371 | void *value = *(void **)lua_touserdata(L,lo); |
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372 | lua_pushstring(L,"tolua_gc"); |
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373 | lua_rawget(L,LUA_REGISTRYINDEX); |
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374 | lua_pushlightuserdata(L,value); |
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375 | lua_rawget(L,-2); |
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376 | if (!lua_isnil(L,-1)) /* make sure that object is not already owned */ |
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377 | success = 0; |
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378 | else |
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379 | { |
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380 | lua_pushlightuserdata(L,value); |
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381 | lua_getmetatable(L,lo); |
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382 | lua_rawset(L,-4); |
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383 | } |
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384 | lua_pop(L,2); |
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385 | return success; |
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386 | } |
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387 | |
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388 | /* Register a usertype |
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389 | * It creates the correspoding metatable in the registry, for both 'type' and 'const type'. |
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390 | * It maps 'const type' as being also a 'type' |
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391 | */ |
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392 | TOLUA_API void tolua_usertype (lua_State* L, const char* type) |
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393 | { |
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394 | char ctype[128] = "const "; |
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395 | strncat(ctype,type,120); |
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396 | |
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397 | /* create both metatables */ |
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398 | if (tolua_newmetatable(L,ctype) && tolua_newmetatable(L,type)) |
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399 | mapsuper(L,type,ctype); /* 'type' is also a 'const type' */ |
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400 | } |
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401 | |
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402 | |
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403 | /* Begin module |
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404 | * It pushes the module (or class) table on the stack |
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405 | */ |
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406 | TOLUA_API void tolua_beginmodule (lua_State* L, const char* name) |
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407 | { |
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408 | if (name) |
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409 | { |
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410 | lua_pushstring(L,name); |
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411 | lua_rawget(L,-2); |
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412 | } |
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413 | else |
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414 | lua_pushvalue(L,LUA_GLOBALSINDEX); |
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415 | } |
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416 | |
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417 | /* End module |
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418 | * It pops the module (or class) from the stack |
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419 | */ |
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420 | TOLUA_API void tolua_endmodule (lua_State* L) |
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421 | { |
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422 | lua_pop(L,1); |
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423 | } |
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424 | |
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425 | /* Map module |
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426 | * It creates a new module |
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427 | */ |
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428 | #if 1 |
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429 | TOLUA_API void tolua_module (lua_State* L, const char* name, int hasvar) |
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430 | { |
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431 | if (name) |
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432 | { |
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433 | /* tolua module */ |
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434 | lua_pushstring(L,name); |
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435 | lua_rawget(L,-2); |
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436 | if (!lua_istable(L,-1)) /* check if module already exists */ |
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437 | { |
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438 | lua_pop(L,1); |
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439 | lua_newtable(L); |
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440 | lua_pushstring(L,name); |
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441 | lua_pushvalue(L,-2); |
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442 | lua_rawset(L,-4); /* assing module into module */ |
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443 | } |
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444 | } |
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445 | else |
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446 | { |
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447 | /* global table */ |
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448 | lua_pushvalue(L,LUA_GLOBALSINDEX); |
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449 | } |
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450 | if (hasvar) |
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451 | { |
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452 | if (!tolua_ismodulemetatable(L)) /* check if it already has a module metatable */ |
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453 | { |
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454 | /* create metatable to get/set C/C++ variable */ |
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455 | lua_newtable(L); |
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456 | tolua_moduleevents(L); |
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457 | if (lua_getmetatable(L,-2)) |
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458 | lua_setmetatable(L,-2); /* set old metatable as metatable of metatable */ |
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459 | lua_setmetatable(L,-2); |
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460 | } |
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461 | } |
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462 | lua_pop(L,1); /* pop module */ |
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463 | } |
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464 | #else |
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465 | TOLUA_API void tolua_module (lua_State* L, const char* name, int hasvar) |
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466 | { |
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467 | if (name) |
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468 | { |
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469 | /* tolua module */ |
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470 | lua_pushstring(L,name); |
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471 | lua_newtable(L); |
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472 | } |
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473 | else |
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474 | { |
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475 | /* global table */ |
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476 | lua_pushvalue(L,LUA_GLOBALSINDEX); |
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477 | } |
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478 | if (hasvar) |
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479 | { |
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480 | /* create metatable to get/set C/C++ variable */ |
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481 | lua_newtable(L); |
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482 | tolua_moduleevents(L); |
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483 | if (lua_getmetatable(L,-2)) |
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484 | lua_setmetatable(L,-2); /* set old metatable as metatable of metatable */ |
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485 | lua_setmetatable(L,-2); |
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486 | } |
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487 | if (name) |
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488 | lua_rawset(L,-3); /* assing module into module */ |
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489 | else |
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490 | lua_pop(L,1); /* pop global table */ |
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491 | } |
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492 | #endif |
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493 | |
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494 | static void push_collector(lua_State* L, const char* type, lua_CFunction col) { |
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495 | |
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496 | /* push collector function, but only if it's not NULL, or if there's no |
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497 | collector already */ |
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498 | if (!col) return; |
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499 | luaL_getmetatable(L,type); |
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500 | lua_pushstring(L,".collector"); |
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501 | /* |
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502 | if (!col) { |
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503 | lua_pushvalue(L, -1); |
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504 | lua_rawget(L, -3); |
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505 | if (!lua_isnil(L, -1)) { |
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506 | lua_pop(L, 3); |
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507 | return; |
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508 | }; |
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509 | lua_pop(L, 1); |
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510 | }; |
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511 | // */ |
---|
512 | lua_pushcfunction(L,col); |
---|
513 | |
---|
514 | lua_rawset(L,-3); |
---|
515 | lua_pop(L, 1); |
---|
516 | }; |
---|
517 | |
---|
518 | /* Map C class |
---|
519 | * It maps a C class, setting the appropriate inheritance and super classes. |
---|
520 | */ |
---|
521 | TOLUA_API void tolua_cclass (lua_State* L, const char* lname, const char* name, const char* base, lua_CFunction col) |
---|
522 | { |
---|
523 | char cname[128] = "const "; |
---|
524 | char cbase[128] = "const "; |
---|
525 | strncat(cname,name,120); |
---|
526 | strncat(cbase,base,120); |
---|
527 | |
---|
528 | mapinheritance(L,name,base); |
---|
529 | mapinheritance(L,cname,name); |
---|
530 | |
---|
531 | mapsuper(L,cname,cbase); |
---|
532 | mapsuper(L,name,base); |
---|
533 | |
---|
534 | lua_pushstring(L,lname); |
---|
535 | |
---|
536 | push_collector(L, name, col); |
---|
537 | /* |
---|
538 | luaL_getmetatable(L,name); |
---|
539 | lua_pushstring(L,".collector"); |
---|
540 | lua_pushcfunction(L,col); |
---|
541 | |
---|
542 | lua_rawset(L,-3); |
---|
543 | */ |
---|
544 | |
---|
545 | luaL_getmetatable(L,name); |
---|
546 | lua_rawset(L,-3); /* assign class metatable to module */ |
---|
547 | |
---|
548 | /* now we also need to store the collector table for the const |
---|
549 | instances of the class */ |
---|
550 | push_collector(L, cname, col); |
---|
551 | /* |
---|
552 | luaL_getmetatable(L,cname); |
---|
553 | lua_pushstring(L,".collector"); |
---|
554 | lua_pushcfunction(L,col); |
---|
555 | lua_rawset(L,-3); |
---|
556 | lua_pop(L,1); |
---|
557 | */ |
---|
558 | |
---|
559 | |
---|
560 | } |
---|
561 | |
---|
562 | /* Add base |
---|
563 | * It adds additional base classes to a class (for multiple inheritance) |
---|
564 | * (not for now) |
---|
565 | TOLUA_API void tolua_addbase(lua_State* L, char* name, char* base) { |
---|
566 | |
---|
567 | char cname[128] = "const "; |
---|
568 | char cbase[128] = "const "; |
---|
569 | strncat(cname,name,120); |
---|
570 | strncat(cbase,base,120); |
---|
571 | |
---|
572 | mapsuper(L,cname,cbase); |
---|
573 | mapsuper(L,name,base); |
---|
574 | }; |
---|
575 | */ |
---|
576 | |
---|
577 | /* Map function |
---|
578 | * It assigns a function into the current module (or class) |
---|
579 | */ |
---|
580 | TOLUA_API void tolua_function (lua_State* L, const char* name, lua_CFunction func) |
---|
581 | { |
---|
582 | lua_pushstring(L,name); |
---|
583 | lua_pushcfunction(L,func); |
---|
584 | lua_rawset(L,-3); |
---|
585 | } |
---|
586 | |
---|
587 | /* sets the __call event for the class (expects the class' main table on top) */ |
---|
588 | /* never really worked :( |
---|
589 | TOLUA_API void tolua_set_call_event(lua_State* L, lua_CFunction func, char* type) { |
---|
590 | |
---|
591 | lua_getmetatable(L, -1); |
---|
592 | //luaL_getmetatable(L, type); |
---|
593 | lua_pushstring(L,"__call"); |
---|
594 | lua_pushcfunction(L,func); |
---|
595 | lua_rawset(L,-3); |
---|
596 | lua_pop(L, 1); |
---|
597 | }; |
---|
598 | */ |
---|
599 | |
---|
600 | /* Map constant number |
---|
601 | * It assigns a constant number into the current module (or class) |
---|
602 | */ |
---|
603 | TOLUA_API void tolua_constant (lua_State* L, const char* name, lua_Number value) |
---|
604 | { |
---|
605 | lua_pushstring(L,name); |
---|
606 | tolua_pushnumber(L,value); |
---|
607 | lua_rawset(L,-3); |
---|
608 | } |
---|
609 | |
---|
610 | |
---|
611 | /* Map variable |
---|
612 | * It assigns a variable into the current module (or class) |
---|
613 | */ |
---|
614 | TOLUA_API void tolua_variable (lua_State* L, const char* name, lua_CFunction get, lua_CFunction set) |
---|
615 | { |
---|
616 | /* get func */ |
---|
617 | lua_pushstring(L,".get"); |
---|
618 | lua_rawget(L,-2); |
---|
619 | if (!lua_istable(L,-1)) |
---|
620 | { |
---|
621 | /* create .get table, leaving it at the top */ |
---|
622 | lua_pop(L,1); |
---|
623 | lua_newtable(L); |
---|
624 | lua_pushstring(L,".get"); |
---|
625 | lua_pushvalue(L,-2); |
---|
626 | lua_rawset(L,-4); |
---|
627 | } |
---|
628 | lua_pushstring(L,name); |
---|
629 | lua_pushcfunction(L,get); |
---|
630 | lua_rawset(L,-3); /* store variable */ |
---|
631 | lua_pop(L,1); /* pop .get table */ |
---|
632 | |
---|
633 | /* set func */ |
---|
634 | if (set) |
---|
635 | { |
---|
636 | lua_pushstring(L,".set"); |
---|
637 | lua_rawget(L,-2); |
---|
638 | if (!lua_istable(L,-1)) |
---|
639 | { |
---|
640 | /* create .set table, leaving it at the top */ |
---|
641 | lua_pop(L,1); |
---|
642 | lua_newtable(L); |
---|
643 | lua_pushstring(L,".set"); |
---|
644 | lua_pushvalue(L,-2); |
---|
645 | lua_rawset(L,-4); |
---|
646 | } |
---|
647 | lua_pushstring(L,name); |
---|
648 | lua_pushcfunction(L,set); |
---|
649 | lua_rawset(L,-3); /* store variable */ |
---|
650 | lua_pop(L,1); /* pop .set table */ |
---|
651 | } |
---|
652 | } |
---|
653 | |
---|
654 | /* Access const array |
---|
655 | * It reports an error when trying to write into a const array |
---|
656 | */ |
---|
657 | static int const_array (lua_State* L) |
---|
658 | { |
---|
659 | luaL_error(L,"value of const array cannot be changed"); |
---|
660 | return 0; |
---|
661 | } |
---|
662 | |
---|
663 | /* Map an array |
---|
664 | * It assigns an array into the current module (or class) |
---|
665 | */ |
---|
666 | TOLUA_API void tolua_array (lua_State* L, const char* name, lua_CFunction get, lua_CFunction set) |
---|
667 | { |
---|
668 | lua_pushstring(L,".get"); |
---|
669 | lua_rawget(L,-2); |
---|
670 | if (!lua_istable(L,-1)) |
---|
671 | { |
---|
672 | /* create .get table, leaving it at the top */ |
---|
673 | lua_pop(L,1); |
---|
674 | lua_newtable(L); |
---|
675 | lua_pushstring(L,".get"); |
---|
676 | lua_pushvalue(L,-2); |
---|
677 | lua_rawset(L,-4); |
---|
678 | } |
---|
679 | lua_pushstring(L,name); |
---|
680 | |
---|
681 | lua_newtable(L); /* create array metatable */ |
---|
682 | lua_pushvalue(L,-1); |
---|
683 | lua_setmetatable(L,-2); /* set the own table as metatable (for modules) */ |
---|
684 | lua_pushstring(L,"__index"); |
---|
685 | lua_pushcfunction(L,get); |
---|
686 | lua_rawset(L,-3); |
---|
687 | lua_pushstring(L,"__newindex"); |
---|
688 | lua_pushcfunction(L,set?set:const_array); |
---|
689 | lua_rawset(L,-3); |
---|
690 | |
---|
691 | lua_rawset(L,-3); /* store variable */ |
---|
692 | lua_pop(L,1); /* pop .get table */ |
---|
693 | } |
---|
694 | |
---|
695 | |
---|
696 | TOLUA_API void tolua_dobuffer(lua_State* L, char* B, unsigned int size, const char* name) { |
---|
697 | |
---|
698 | #ifdef LUA_VERSION_NUM /* lua 5.1 */ |
---|
699 | luaL_loadbuffer(L, B, size, name) || lua_pcall(L, 0, 0, 0); |
---|
700 | #else |
---|
701 | lua_dobuffer(L, B, size, name); |
---|
702 | #endif |
---|
703 | }; |
---|
704 | |
---|