Mercurial > hg > orthanc

annotate Core/Lua/LuaFunctionCall.cpp @ 1205:bb1ad2fbf914

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 03 Nov 2014 13:40:14 +0100
parents 92f4bf2c5d73
children 6e7e5ed91c2d
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 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 "../PrecompiledHeaders.h"
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34 #include "LuaFunctionCall.h"
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35
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36 #include <cassert>
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37 #include <stdio.h>
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38 #include <boost/lexical_cast.hpp>
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39 #include <glog/logging.h>
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40
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41 namespace Orthanc
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42 {
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43 void LuaFunctionCall::CheckAlreadyExecuted()
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44 {
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45 if (isExecuted_)
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46 {
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47 throw LuaException("Arguments cannot be pushed after the function is executed");
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48 }
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49 }
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50
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51 LuaFunctionCall::LuaFunctionCall(LuaContext& context,
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52 const char* functionName) :
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53 context_(context),
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54 isExecuted_(false)
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55 {
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56 // Clear the stack to fulfill the invariant
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57 lua_settop(context_.lua_, 0);
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58 lua_getglobal(context_.lua_, functionName);
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59 }
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60
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61 void LuaFunctionCall::PushString(const std::string& value)
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62 {
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63 CheckAlreadyExecuted();
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64 lua_pushstring(context_.lua_, value.c_str());
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65 }
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66
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67 void LuaFunctionCall::PushBoolean(bool value)
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68 {
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69 CheckAlreadyExecuted();
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70 lua_pushboolean(context_.lua_, value);
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71 }
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72
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73 void LuaFunctionCall::PushInteger(int value)
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74 {
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75 CheckAlreadyExecuted();
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76 lua_pushinteger(context_.lua_, value);
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77 }
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78
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79 void LuaFunctionCall::PushDouble(double value)
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80 {
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81 CheckAlreadyExecuted();
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82 lua_pushnumber(context_.lua_, value);
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83 }
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84
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85 void LuaFunctionCall::PushJson(const Json::Value& value)
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86 {
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87 CheckAlreadyExecuted();
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88 context_.PushJson(value);
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89 }
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90
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91 void LuaFunctionCall::ExecuteInternal(int numOutputs)
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92 {
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93 CheckAlreadyExecuted();
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94
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95 assert(lua_gettop(context_.lua_) >= 1);
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96 int nargs = lua_gettop(context_.lua_) - 1;
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97 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0);
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98
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99 if (error)
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100 {
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101 assert(lua_gettop(context_.lua_) >= 1);
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102
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103 std::string description(lua_tostring(context_.lua_, -1));
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104 lua_pop(context_.lua_, 1); /* pop error message from the stack */
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105 throw LuaException(description);
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106 }
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107
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108 if (lua_gettop(context_.lua_) < numOutputs)
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109 {
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110 throw LuaException("The function does not give the expected number of outputs");
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111 }
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112
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113 isExecuted_ = true;
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114 }
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115
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116 bool LuaFunctionCall::ExecutePredicate()
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117 {
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118 ExecuteInternal(1);
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119
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120 if (!lua_isboolean(context_.lua_, 1))
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121 {
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122 throw LuaException("The function is not a predicate (only true/false outputs allowed)");
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123 }
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124
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125 return lua_toboolean(context_.lua_, 1) != 0;
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126 }
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127
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128
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129 static void PopJson(Json::Value& result,
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130 lua_State* lua,
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131 int top)
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132 {
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133 if (lua_istable(lua, top))
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134 {
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135 Json::Value tmp = Json::objectValue;
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136 bool isArray = true;
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137 size_t size = 0;
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138
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139 // http://stackoverflow.com/a/6142700/881731
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140
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141 // Push another reference to the table on top of the stack (so we know
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142 // where it is, and this function can work for negative, positive and
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143 // pseudo indices
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144 lua_pushvalue(lua, top);
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145 // stack now contains: -1 => table
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146 lua_pushnil(lua);
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147 // stack now contains: -1 => nil; -2 => table
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148 while (lua_next(lua, -2))
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149 {
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150 // stack now contains: -1 => value; -2 => key; -3 => table
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151 // copy the key so that lua_tostring does not modify the original
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152 lua_pushvalue(lua, -2);
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153 // stack now contains: -1 => key; -2 => value; -3 => key; -4 => table
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154 std::string key(lua_tostring(lua, -1));
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155 Json::Value v;
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156 PopJson(v, lua, -2);
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157
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158 tmp[key] = v;
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159
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160 size += 1;
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161 try
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162 {
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163 if (boost::lexical_cast<size_t>(key) != size)
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164 {
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165 isArray = false;
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166 }
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167 }
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168 catch (boost::bad_lexical_cast&)
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169 {
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170 isArray = false;
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171 }
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172
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173 // pop value + copy of key, leaving original key
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174 lua_pop(lua, 2);
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175 // stack now contains: -1 => key; -2 => table
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176 }
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177 // stack now contains: -1 => table (when lua_next returns 0 it pops the key
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Sebastien Jodogne <s.jodogne@gmail.com>
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178 // but does not push anything.)
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Sebastien Jodogne <s.jodogne@gmail.com>
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179 // Pop table
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180 lua_pop(lua, 1);
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Sebastien Jodogne <s.jodogne@gmail.com>
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181
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182 // Stack is now the same as it was on entry to this function
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183
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184 if (isArray)
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Sebastien Jodogne <s.jodogne@gmail.com>
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185 {
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186 result = Json::arrayValue;
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Sebastien Jodogne <s.jodogne@gmail.com>
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187 for (size_t i = 0; i < size; i++)
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Sebastien Jodogne <s.jodogne@gmail.com>
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188 {
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189 result.append(tmp[boost::lexical_cast<std::string>(i + 1)]);
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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190 }
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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191 }
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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192 else
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193 {
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194 result = tmp;
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Sebastien Jodogne <s.jodogne@gmail.com>
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195 }
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Sebastien Jodogne <s.jodogne@gmail.com>
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196 }
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
197 else if (lua_isnumber(lua, top))
1b1d51e9f1a2 return Json from Lua
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198 {
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diff changeset
199 result = static_cast<float>(lua_tonumber(lua, top));
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200 }
1b1d51e9f1a2 return Json from Lua
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diff changeset
201 else if (lua_isstring(lua, top))
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
202 {
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diff changeset
203 result = std::string(lua_tostring(lua, top));
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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204 }
1010
160dfe770618 refactoring
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205 else if (lua_isboolean(lua, top))
160dfe770618 refactoring
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diff changeset
206 {
160dfe770618 refactoring
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parents: 997
diff changeset
207 result = static_cast<bool>(lua_toboolean(lua, top));
160dfe770618 refactoring
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diff changeset
208 }
997
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
209 else
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
210 {
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
211 LOG(WARNING) << "Unsupported Lua type when returning Json";
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
212 result = Json::nullValue;
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
213 }
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
214 }
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
215
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
216
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
217 void LuaFunctionCall::ExecuteToJson(Json::Value& result)
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
218 {
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
219 ExecuteInternal(1);
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
220 PopJson(result, context_.lua_, lua_gettop(context_.lua_));
1b1d51e9f1a2 return Json from Lua
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 996
diff changeset
221 }
386
7dec4f3c922c lua wrapper
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
222 }