prosody
f408d586de9a
core/configmanager.lua

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core/configmanager.lua @ 3839:f408d586de9a

hostmanager: Improved error handling.
author Waqas Hussain <waqas20@gmail.com>
date Thu, 09 Dec 2010 21:40:54 +0500
parent 3613:f617718d2221
child 3780:791aede977da
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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841d61be198f Remove version number from copyright headers
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1 -- Prosody IM
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b7049746bd29 Update copyright headers for 2010
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
519
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7 --
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8
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9 local _G = _G;
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10 local setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, format =
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11 setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, string.format;
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12
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13
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14 local fire_event = prosody and prosody.events.fire_event or function () end;
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15
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16 local path_sep = package.config:sub(1,1);
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17
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18 module "configmanager"
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19
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20 local parsers = {};
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21
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22 local config_mt = { __index = function (t, k) return rawget(t, "*"); end};
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23 local config = setmetatable({ ["*"] = { core = {} } }, config_mt);
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24
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25 -- When host not found, use global
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26 local host_mt = { };
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27
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28 -- When key not found in section, check key in global's section
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29 function section_mt(section_name)
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30 return { __index = function (t, k)
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31 local section = rawget(config["*"], section_name);
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32 if not section then return nil; end
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33 return section[k];
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34 end
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35 };
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36 end
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37
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38 function getconfig()
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39 return config;
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40 end
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41
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42 function get(host, section, key)
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43 local sec = config[host][section];
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44 if sec then
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45 return sec[key];
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46 end
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47 return nil;
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48 end
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49
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50 local function set(config, host, section, key, value)
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51 if host and section and key then
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52 local hostconfig = rawget(config, host);
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53 if not hostconfig then
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54 hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];
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55 end
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56 if not rawget(hostconfig, section) then
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57 hostconfig[section] = setmetatable({}, section_mt(section));
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58 end
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59 hostconfig[section][key] = value;
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60 return true;
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61 end
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62 return false;
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63 end
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64
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65 function _M.set(host, section, key, value)
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66 return set(config, host, section, key, value);
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67 end
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68
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69 -- Helper function to resolve relative paths (needed by config)
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70 do
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71 local rel_path_start = ".."..path_sep;
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72 function resolve_relative_path(parent_path, path)
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73 if path then
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74 local is_relative;
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75 if path_sep == "/" and path:sub(1,1) ~= "/" then
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76 is_relative = true;
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77 elseif path_sep == "\\" and (path:sub(1,1) ~= "/" and path:sub(2,3) ~= ":\\") then
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78 is_relative = true;
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79 end
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80 if is_relative then
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81 return parent_path..path_sep..path;
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82 end
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83 end
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84 return path;
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85 end
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86 end
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87
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88 function load(filename, format)
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89 format = format or filename:match("%w+$");
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90
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91 if parsers[format] and parsers[format].load then
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92 local f, err = io.open(filename);
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93 if f then
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94 local new_config = setmetatable({ ["*"] = { core = {} } }, config_mt);
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95 local ok, err = parsers[format].load(f:read("*a"), filename, new_config);
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96 f:close();
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97 if ok then
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98 config = new_config;
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99 fire_event("config-reloaded", {
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100 filename = filename,
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101 format = format,
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102 config = config
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103 });
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104 end
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105 return not not new_config, "parser", err;
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106 end
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107 return f, "file", err;
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108 end
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109
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110 if not format then
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111 return nil, "file", "no parser specified";
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112 else
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113 return nil, "file", "no parser for "..(format);
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114 end
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115 end
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116
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117 function save(filename, format)
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118 end
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119
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120 function addparser(format, parser)
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121 if format and parser then
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122 parsers[format] = parser;
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123 end
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124 end
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125
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126 -- _M needed to avoid name clash with local 'parsers'
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127 function _M.parsers()
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128 local p = {};
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129 for format in pairs(parsers) do
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130 table.insert(p, format);
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131 end
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132 return p;
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133 end
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134
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135 -- Built-in Lua parser
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136 do
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137 local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;
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138 local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;
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139 parsers.lua = {};
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140 function parsers.lua.load(data, filename, config)
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141 local env;
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142 -- The ' = true' are needed so as not to set off __newindex when we assign the functions below
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143 env = setmetatable({
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144 Host = true, host = true, VirtualHost = true,
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145 Component = true, component = true,
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146 Include = true, include = true, RunScript = true }, {
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147 __index = function (t, k)
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148 return rawget(_G, k) or
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149 function (settings_table)
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150 config[__currenthost or "*"][k] = settings_table;
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151 end;
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152 end,
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153 __newindex = function (t, k, v)
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154 set(config, env.__currenthost or "*", "core", k, v);
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155 end
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156 });
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157
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158 rawset(env, "__currenthost", "*") -- Default is global
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159 function env.VirtualHost(name)
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160 if rawget(config, name) and rawget(config[name].core, "component_module") then
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161 error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
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162 name, config[name].core.component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
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163 end
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164 rawset(env, "__currenthost", name);
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165 -- Needs at least one setting to logically exist :)
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166 set(config, name or "*", "core", "defined", true);
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167 return function (config_options)
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168 rawset(env, "__currenthost", "*"); -- Return to global scope
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169 for option_name, option_value in pairs(config_options) do
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170 set(config, name or "*", "core", option_name, option_value);
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171 end
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172 end;
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173 end
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174 env.Host, env.host = env.VirtualHost, env.VirtualHost;
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175
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176 function env.Component(name)
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177 if rawget(config, name) and rawget(config[name].core, "defined") and not rawget(config[name].core, "component_module") then
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178 error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
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179 name, name, name), 0);
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180 end
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181 set(config, name, "core", "component_module", "component");
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182 -- Don't load the global modules by default
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183 set(config, name, "core", "load_global_modules", false);
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184 rawset(env, "__currenthost", name);
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185 local function handle_config_options(config_options)
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186 rawset(env, "__currenthost", "*"); -- Return to global scope
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187 for option_name, option_value in pairs(config_options) do
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188 set(config, name or "*", "core", option_name, option_value);
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189 end
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190 end
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191
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192 return function (module)
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193 if type(module) == "string" then
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194 set(config, name, "core", "component_module", module);
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195 return handle_config_options;
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196 end
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197 return handle_config_options(module);
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198 end
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199 end
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200 env.component = env.Component;
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201
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202 function env.Include(file)
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203 local f, err = io.open(file);
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204 if f then
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205 local data = f:read("*a");
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206 local file = resolve_relative_path(filename:gsub("[^"..path_sep.."]+$", ""), file);
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207 local ret, err = parsers.lua.load(data, file, config);
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208 if not ret then error(err:gsub("%[string.-%]", file), 0); end
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209 end
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210 if not f then error("Error loading included "..file..": "..err, 0); end
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211 return f, err;
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212 end
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213 env.include = env.Include;
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214
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215 function env.RunScript(file)
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216 return dofile(resolve_relative_path(filename:gsub("[^"..path_sep.."]+$", ""), file));
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217 end
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218
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219 local chunk, err = loadstring(data, "@"..filename);
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220
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221 if not chunk then
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222 return nil, err;
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223 end
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224
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225 setfenv(chunk, env);
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226
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227 local ok, err = pcall(chunk);
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228
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229 if not ok then
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230 return nil, err;
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231 end
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232
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233 return true;
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234 end
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235
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236 end
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237
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238 return _M;