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annotate src/auxiliar.c @ 0:4b915342e2a8

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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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0
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
Eric Wing <ewing . public |-at-| gmail . com>
parents:
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1 /*=========================================================================*\
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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2 * Auxiliar routines for class hierarchy manipulation
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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3 * LuaSocket toolkit
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4 *
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5 * RCS ID: $Id: auxiliar.c,v 1.14 2005/10/07 04:40:59 diego Exp $
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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6 \*=========================================================================*/
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7 #include <string.h>
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8 #include <stdio.h>
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9
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10 #include "auxiliar.h"
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11
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12 /*=========================================================================*\
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13 * Exported functions
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14 \*=========================================================================*/
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15 /*-------------------------------------------------------------------------*\
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16 * Initializes the module
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17 \*-------------------------------------------------------------------------*/
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18 int auxiliar_open(lua_State *L) {
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19 (void) L;
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20 return 0;
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21 }
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22
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23 /*-------------------------------------------------------------------------*\
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24 * Creates a new class with given methods
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25 * Methods whose names start with __ are passed directly to the metatable.
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26 \*-------------------------------------------------------------------------*/
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27 void auxiliar_newclass(lua_State *L, const char *classname, luaL_reg *func) {
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28 luaL_newmetatable(L, classname); /* mt */
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29 /* create __index table to place methods */
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30 lua_pushstring(L, "__index"); /* mt,"__index" */
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31 lua_newtable(L); /* mt,"__index",it */
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32 /* put class name into class metatable */
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33 lua_pushstring(L, "class"); /* mt,"__index",it,"class" */
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34 lua_pushstring(L, classname); /* mt,"__index",it,"class",classname */
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35 lua_rawset(L, -3); /* mt,"__index",it */
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36 /* pass all methods that start with _ to the metatable, and all others
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37 * to the index table */
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38 for (; func->name; func++) { /* mt,"__index",it */
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39 lua_pushstring(L, func->name);
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40 lua_pushcfunction(L, func->func);
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41 lua_rawset(L, func->name[0] == '_' ? -5: -3);
4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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42 }
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43 lua_rawset(L, -3); /* mt */
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44 lua_pop(L, 1);
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45 }
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46
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47 /*-------------------------------------------------------------------------*\
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48 * Prints the value of a class in a nice way
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49 \*-------------------------------------------------------------------------*/
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50 int auxiliar_tostring(lua_State *L) {
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51 char buf[32];
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52 if (!lua_getmetatable(L, 1)) goto error;
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53 lua_pushstring(L, "__index");
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54 lua_gettable(L, -2);
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55 if (!lua_istable(L, -1)) goto error;
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56 lua_pushstring(L, "class");
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57 lua_gettable(L, -2);
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58 if (!lua_isstring(L, -1)) goto error;
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59 sprintf(buf, "%p", lua_touserdata(L, 1));
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60 lua_pushfstring(L, "%s: %s", lua_tostring(L, -1), buf);
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61 return 1;
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62 error:
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63 lua_pushstring(L, "invalid object passed to 'auxiliar.c:__tostring'");
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64 lua_error(L);
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65 return 1;
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66 }
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67
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68 /*-------------------------------------------------------------------------*\
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69 * Insert class into group
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70 \*-------------------------------------------------------------------------*/
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71 void auxiliar_add2group(lua_State *L, const char *classname, const char *groupname) {
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72 luaL_getmetatable(L, classname);
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73 lua_pushstring(L, groupname);
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74 lua_pushboolean(L, 1);
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75 lua_rawset(L, -3);
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76 lua_pop(L, 1);
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77 }
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78
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79 /*-------------------------------------------------------------------------*\
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80 * Make sure argument is a boolean
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81 \*-------------------------------------------------------------------------*/
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82 int auxiliar_checkboolean(lua_State *L, int objidx) {
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83 if (!lua_isboolean(L, objidx))
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84 luaL_typerror(L, objidx, lua_typename(L, LUA_TBOOLEAN));
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85 return lua_toboolean(L, objidx);
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86 }
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87
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88 /*-------------------------------------------------------------------------*\
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89 * Return userdata pointer if object belongs to a given class, abort with
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90 * error otherwise
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91 \*-------------------------------------------------------------------------*/
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92 void *auxiliar_checkclass(lua_State *L, const char *classname, int objidx) {
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93 void *data = auxiliar_getclassudata(L, classname, objidx);
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94 if (!data) {
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95 char msg[45];
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96 sprintf(msg, "%.35s expected", classname);
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97 luaL_argerror(L, objidx, msg);
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98 }
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99 return data;
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100 }
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101
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102 /*-------------------------------------------------------------------------*\
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103 * Return userdata pointer if object belongs to a given group, abort with
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104 * error otherwise
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105 \*-------------------------------------------------------------------------*/
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106 void *auxiliar_checkgroup(lua_State *L, const char *groupname, int objidx) {
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107 void *data = auxiliar_getgroupudata(L, groupname, objidx);
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108 if (!data) {
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109 char msg[45];
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110 sprintf(msg, "%.35s expected", groupname);
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111 luaL_argerror(L, objidx, msg);
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112 }
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113 return data;
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114 }
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115
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116 /*-------------------------------------------------------------------------*\
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117 * Set object class
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118 \*-------------------------------------------------------------------------*/
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119 void auxiliar_setclass(lua_State *L, const char *classname, int objidx) {
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120 luaL_getmetatable(L, classname);
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121 if (objidx < 0) objidx--;
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122 lua_setmetatable(L, objidx);
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123 }
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124
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125 /*-------------------------------------------------------------------------*\
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126 * Get a userdata pointer if object belongs to a given group. Return NULL
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127 * otherwise
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128 \*-------------------------------------------------------------------------*/
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129 void *auxiliar_getgroupudata(lua_State *L, const char *groupname, int objidx) {
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130 if (!lua_getmetatable(L, objidx))
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131 return NULL;
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132 lua_pushstring(L, groupname);
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133 lua_rawget(L, -2);
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134 if (lua_isnil(L, -1)) {
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135 lua_pop(L, 2);
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136 return NULL;
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137 } else {
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138 lua_pop(L, 2);
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139 return lua_touserdata(L, objidx);
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140 }
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141 }
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142
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143 /*-------------------------------------------------------------------------*\
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144 * Get a userdata pointer if object belongs to a given class. Return NULL
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145 * otherwise
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146 \*-------------------------------------------------------------------------*/
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147 void *auxiliar_getclassudata(lua_State *L, const char *classname, int objidx) {
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148 return luaL_checkudata(L, objidx, classname);
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149 }