Mercurial > hg > orthanc
annotate Core/Lua/LuaFunctionCall.cpp @ 1064:cd20e2568fc2
fix tests
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 25 Jul 2014 16:13:36 +0200 |
parents | 92f4bf2c5d73 |
children | 6e7e5ed91c2d |
rev | line source |
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386 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
689 | 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
386 | 4 * Belgium |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
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33 #include "../PrecompiledHeaders.h" |
386 | 34 #include "LuaFunctionCall.h" |
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> |
386 | 40 |
41 namespace Orthanc | |
42 { | |
43 void LuaFunctionCall::CheckAlreadyExecuted() | |
44 { | |
45 if (isExecuted_) | |
46 { | |
47 throw LuaException("Arguments cannot be pushed after the function is executed"); | |
48 } | |
49 } | |
50 | |
51 LuaFunctionCall::LuaFunctionCall(LuaContext& context, | |
52 const char* functionName) : | |
53 context_(context), | |
54 isExecuted_(false) | |
55 { | |
56 // Clear the stack to fulfill the invariant | |
57 lua_settop(context_.lua_, 0); | |
58 lua_getglobal(context_.lua_, functionName); | |
59 } | |
60 | |
61 void LuaFunctionCall::PushString(const std::string& value) | |
62 { | |
63 CheckAlreadyExecuted(); | |
64 lua_pushstring(context_.lua_, value.c_str()); | |
65 } | |
66 | |
67 void LuaFunctionCall::PushBoolean(bool value) | |
68 { | |
69 CheckAlreadyExecuted(); | |
70 lua_pushboolean(context_.lua_, value); | |
71 } | |
72 | |
73 void LuaFunctionCall::PushInteger(int value) | |
74 { | |
75 CheckAlreadyExecuted(); | |
76 lua_pushinteger(context_.lua_, value); | |
77 } | |
78 | |
79 void LuaFunctionCall::PushDouble(double value) | |
80 { | |
81 CheckAlreadyExecuted(); | |
82 lua_pushnumber(context_.lua_, value); | |
83 } | |
84 | |
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85 void LuaFunctionCall::PushJson(const Json::Value& value) |
386 | 86 { |
87 CheckAlreadyExecuted(); | |
1051 | 88 context_.PushJson(value); |
386 | 89 } |
90 | |
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91 void LuaFunctionCall::ExecuteInternal(int numOutputs) |
386 | 92 { |
93 CheckAlreadyExecuted(); | |
94 | |
95 assert(lua_gettop(context_.lua_) >= 1); | |
96 int nargs = lua_gettop(context_.lua_) - 1; | |
97 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0); | |
98 | |
99 if (error) | |
100 { | |
101 assert(lua_gettop(context_.lua_) >= 1); | |
102 | |
103 std::string description(lua_tostring(context_.lua_, -1)); | |
104 lua_pop(context_.lua_, 1); /* pop error message from the stack */ | |
105 throw LuaException(description); | |
106 } | |
107 | |
108 if (lua_gettop(context_.lua_) < numOutputs) | |
109 { | |
110 throw LuaException("The function does not give the expected number of outputs"); | |
111 } | |
112 | |
113 isExecuted_ = true; | |
114 } | |
115 | |
116 bool LuaFunctionCall::ExecutePredicate() | |
117 { | |
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118 ExecuteInternal(1); |
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119 |
386 | 120 if (!lua_isboolean(context_.lua_, 1)) |
121 { | |
122 throw LuaException("The function is not a predicate (only true/false outputs allowed)"); | |
123 } | |
124 | |
125 return lua_toboolean(context_.lua_, 1) != 0; | |
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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178 // but does not push anything.) |
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179 // Pop table |
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180 lua_pop(lua, 1); |
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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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185 { |
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186 result = Json::arrayValue; |
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187 for (size_t i = 0; i < size; i++) |
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188 { |
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189 result.append(tmp[boost::lexical_cast<std::string>(i + 1)]); |
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190 } |
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191 } |
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192 else |
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193 { |
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194 result = tmp; |
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195 } |
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196 } |
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197 else if (lua_isnumber(lua, top)) |
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198 { |
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199 result = static_cast<float>(lua_tonumber(lua, top)); |
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200 } |
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201 else if (lua_isstring(lua, top)) |
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202 { |
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203 result = std::string(lua_tostring(lua, top)); |
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204 } |
1010 | 205 else if (lua_isboolean(lua, top)) |
206 { | |
207 result = static_cast<bool>(lua_toboolean(lua, top)); | |
208 } | |
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209 else |
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210 { |
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211 LOG(WARNING) << "Unsupported Lua type when returning Json"; |
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212 result = Json::nullValue; |
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213 } |
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214 } |
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215 |
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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216 |
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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217 void LuaFunctionCall::ExecuteToJson(Json::Value& result) |
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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218 { |
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Sebastien Jodogne <s.jodogne@gmail.com>
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219 ExecuteInternal(1); |
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Sebastien Jodogne <s.jodogne@gmail.com>
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220 PopJson(result, context_.lua_, lua_gettop(context_.lua_)); |
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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221 } |
386 | 222 } |