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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "LuaFunctionCall.h"
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34
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35
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36 namespace Orthanc
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37 {
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38 void LuaFunctionCall::CheckAlreadyExecuted()
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39 {
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40 if (isExecuted_)
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41 {
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42 throw LuaException("Arguments cannot be pushed after the function is executed");
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43 }
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44 }
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45
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46 LuaFunctionCall::LuaFunctionCall(LuaContext& context,
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47 const char* functionName) :
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48 context_(context),
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49 lock_(context.mutex_),
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50 isExecuted_(false)
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51 {
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52 // Clear the stack to fulfill the invariant
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53 lua_settop(context_.lua_, 0);
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54 lua_getglobal(context_.lua_, functionName);
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55 }
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56
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57 void LuaFunctionCall::PushString(const std::string& value)
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58 {
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59 CheckAlreadyExecuted();
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60 lua_pushstring(context_.lua_, value.c_str());
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61 }
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62
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63 void LuaFunctionCall::PushBoolean(bool value)
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64 {
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65 CheckAlreadyExecuted();
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66 lua_pushboolean(context_.lua_, value);
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67 }
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68
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69 void LuaFunctionCall::PushInteger(int value)
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70 {
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71 CheckAlreadyExecuted();
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72 lua_pushinteger(context_.lua_, value);
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73 }
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74
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75 void LuaFunctionCall::PushDouble(double value)
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76 {
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77 CheckAlreadyExecuted();
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78 lua_pushnumber(context_.lua_, value);
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79 }
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80
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81 void LuaFunctionCall::PushJSON(const Json::Value& value)
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82 {
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83 CheckAlreadyExecuted();
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84
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85 if (value.isString())
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86 {
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87 lua_pushstring(context_.lua_, value.asCString());
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88 }
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89 else if (value.isDouble())
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90 {
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91 lua_pushnumber(context_.lua_, value.asDouble());
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92 }
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93 else if (value.isInt())
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94 {
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95 lua_pushinteger(context_.lua_, value.asInt());
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96 }
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97 else if (value.isUInt())
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98 {
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99 lua_pushinteger(context_.lua_, value.asUInt());
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100 }
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101 else if (value.isBool())
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102 {
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103 lua_pushboolean(context_.lua_, value.asBool());
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104 }
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105 else if (value.isNull())
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106 {
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107 lua_pushnil(context_.lua_);
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108 }
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109 else if (value.isArray())
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110 {
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111 lua_newtable(context_.lua_);
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112
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113 // http://lua-users.org/wiki/SimpleLuaApiExample
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114 for (Json::Value::ArrayIndex i = 0; i < value.size(); i++)
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115 {
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116 // Push the table index (note the "+1" because of Lua conventions)
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117 lua_pushnumber(context_.lua_, i + 1);
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118
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119 // Push the value of the cell
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120 PushJSON(value[i]);
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121
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122 // Stores the pair in the table
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123 lua_rawset(context_.lua_, -3);
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124 }
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125 }
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126 else if (value.isObject())
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127 {
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128 lua_newtable(context_.lua_);
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129
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130 Json::Value::Members members = value.getMemberNames();
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131
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132 for (Json::Value::Members::const_iterator
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133 it = members.begin(); it != members.end(); it++)
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134 {
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135 // Push the index of the cell
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136 lua_pushstring(context_.lua_, it->c_str());
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137
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138 // Push the value of the cell
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139 PushJSON(value[*it]);
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140
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141 // Stores the pair in the table
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142 lua_rawset(context_.lua_, -3);
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143 }
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144 }
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145 else
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146 {
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147 throw LuaException("Unsupported JSON conversion");
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148 }
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149 }
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150
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151 void LuaFunctionCall::Execute(int numOutputs)
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152 {
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153 CheckAlreadyExecuted();
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154
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155 assert(lua_gettop(context_.lua_) >= 1);
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156 int nargs = lua_gettop(context_.lua_) - 1;
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157 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0);
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158
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159 if (error)
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160 {
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161 assert(lua_gettop(context_.lua_) >= 1);
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162
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163 std::string description(lua_tostring(context_.lua_, -1));
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164 lua_pop(context_.lua_, 1); /* pop error message from the stack */
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165 throw LuaException(description);
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166 }
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167
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168 if (lua_gettop(context_.lua_) < numOutputs)
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169 {
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170 throw LuaException("The function does not give the expected number of outputs");
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171 }
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172
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173 isExecuted_ = true;
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174 }
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175
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176 bool LuaFunctionCall::ExecutePredicate()
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177 {
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178 Execute(1);
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179
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180 if (lua_gettop(context_.lua_) == 0)
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181 {
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182 throw LuaException("No output was provided by the function");
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183 }
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184
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185 if (!lua_isboolean(context_.lua_, 1))
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186 {
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187 throw LuaException("The function is not a predicate (only true/false outputs allowed)");
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188 }
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189
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190 return lua_toboolean(context_.lua_, 1) != 0;
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191 }
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192 }
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