Mercurial > hg > orthanc
annotate Core/Lua/LuaFunctionCall.cpp @ 997:1b1d51e9f1a2 lua-scripting
return Json from Lua
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 03 Jul 2014 18:12:50 +0200 |
parents | cf52f3bcb2b3 |
children | 160dfe770618 |
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(); | |
88 | |
89 if (value.isString()) | |
90 { | |
91 lua_pushstring(context_.lua_, value.asCString()); | |
92 } | |
93 else if (value.isDouble()) | |
94 { | |
95 lua_pushnumber(context_.lua_, value.asDouble()); | |
96 } | |
97 else if (value.isInt()) | |
98 { | |
99 lua_pushinteger(context_.lua_, value.asInt()); | |
100 } | |
101 else if (value.isUInt()) | |
102 { | |
103 lua_pushinteger(context_.lua_, value.asUInt()); | |
104 } | |
105 else if (value.isBool()) | |
106 { | |
107 lua_pushboolean(context_.lua_, value.asBool()); | |
108 } | |
109 else if (value.isNull()) | |
110 { | |
111 lua_pushnil(context_.lua_); | |
112 } | |
113 else if (value.isArray()) | |
114 { | |
115 lua_newtable(context_.lua_); | |
116 | |
117 // http://lua-users.org/wiki/SimpleLuaApiExample | |
118 for (Json::Value::ArrayIndex i = 0; i < value.size(); i++) | |
119 { | |
120 // Push the table index (note the "+1" because of Lua conventions) | |
121 lua_pushnumber(context_.lua_, i + 1); | |
122 | |
123 // Push the value of the cell | |
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124 PushJson(value[i]); |
386 | 125 |
126 // Stores the pair in the table | |
127 lua_rawset(context_.lua_, -3); | |
128 } | |
129 } | |
130 else if (value.isObject()) | |
131 { | |
132 lua_newtable(context_.lua_); | |
133 | |
134 Json::Value::Members members = value.getMemberNames(); | |
135 | |
136 for (Json::Value::Members::const_iterator | |
656 | 137 it = members.begin(); it != members.end(); ++it) |
386 | 138 { |
139 // Push the index of the cell | |
140 lua_pushstring(context_.lua_, it->c_str()); | |
141 | |
142 // Push the value of the cell | |
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143 PushJson(value[*it]); |
386 | 144 |
145 // Stores the pair in the table | |
146 lua_rawset(context_.lua_, -3); | |
147 } | |
148 } | |
149 else | |
150 { | |
151 throw LuaException("Unsupported JSON conversion"); | |
152 } | |
153 } | |
154 | |
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155 void LuaFunctionCall::ExecuteInternal(int numOutputs) |
386 | 156 { |
157 CheckAlreadyExecuted(); | |
158 | |
159 assert(lua_gettop(context_.lua_) >= 1); | |
160 int nargs = lua_gettop(context_.lua_) - 1; | |
161 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0); | |
162 | |
163 if (error) | |
164 { | |
165 assert(lua_gettop(context_.lua_) >= 1); | |
166 | |
167 std::string description(lua_tostring(context_.lua_, -1)); | |
168 lua_pop(context_.lua_, 1); /* pop error message from the stack */ | |
169 throw LuaException(description); | |
170 } | |
171 | |
172 if (lua_gettop(context_.lua_) < numOutputs) | |
173 { | |
174 throw LuaException("The function does not give the expected number of outputs"); | |
175 } | |
176 | |
177 isExecuted_ = true; | |
178 } | |
179 | |
180 bool LuaFunctionCall::ExecutePredicate() | |
181 { | |
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182 ExecuteInternal(1); |
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183 |
386 | 184 if (!lua_isboolean(context_.lua_, 1)) |
185 { | |
186 throw LuaException("The function is not a predicate (only true/false outputs allowed)"); | |
187 } | |
188 | |
189 return lua_toboolean(context_.lua_, 1) != 0; | |
190 } | |
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191 |
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192 |
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193 static void PopJson(Json::Value& result, |
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194 lua_State* lua, |
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195 int top) |
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196 { |
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197 if (lua_istable(lua, top)) |
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198 { |
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199 Json::Value tmp = Json::objectValue; |
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200 bool isArray = true; |
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201 size_t size = 0; |
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202 |
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203 // http://stackoverflow.com/a/6142700/881731 |
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204 |
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205 // Push another reference to the table on top of the stack (so we know |
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206 // where it is, and this function can work for negative, positive and |
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207 // pseudo indices |
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208 lua_pushvalue(lua, top); |
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209 // stack now contains: -1 => table |
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210 lua_pushnil(lua); |
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211 // stack now contains: -1 => nil; -2 => table |
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212 while (lua_next(lua, -2)) |
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213 { |
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214 // stack now contains: -1 => value; -2 => key; -3 => table |
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215 // copy the key so that lua_tostring does not modify the original |
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216 lua_pushvalue(lua, -2); |
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217 // stack now contains: -1 => key; -2 => value; -3 => key; -4 => table |
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218 std::string key(lua_tostring(lua, -1)); |
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219 Json::Value v; |
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220 PopJson(v, lua, -2); |
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221 |
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222 tmp[key] = v; |
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223 |
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224 size += 1; |
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225 try |
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226 { |
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227 if (boost::lexical_cast<size_t>(key) != size) |
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228 { |
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229 isArray = false; |
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230 } |
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231 } |
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232 catch (boost::bad_lexical_cast&) |
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233 { |
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234 isArray = false; |
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235 } |
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236 |
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237 // pop value + copy of key, leaving original key |
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238 lua_pop(lua, 2); |
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239 // stack now contains: -1 => key; -2 => table |
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240 } |
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241 // stack now contains: -1 => table (when lua_next returns 0 it pops the key |
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242 // but does not push anything.) |
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243 // Pop table |
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244 lua_pop(lua, 1); |
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245 |
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246 // Stack is now the same as it was on entry to this function |
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247 |
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248 if (isArray) |
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249 { |
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250 result = Json::arrayValue; |
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251 for (size_t i = 0; i < size; i++) |
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252 { |
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253 result.append(tmp[boost::lexical_cast<std::string>(i + 1)]); |
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254 } |
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255 } |
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256 else |
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257 { |
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258 result = tmp; |
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259 } |
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260 } |
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261 else if (lua_isnumber(lua, top)) |
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262 { |
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263 result = static_cast<float>(lua_tonumber(lua, top)); |
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264 } |
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265 else if (lua_isstring(lua, top)) |
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266 { |
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267 result = std::string(lua_tostring(lua, top)); |
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268 } |
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269 else |
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270 { |
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271 LOG(WARNING) << "Unsupported Lua type when returning Json"; |
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272 result = Json::nullValue; |
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273 } |
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274 } |
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275 |
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276 |
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277 void LuaFunctionCall::ExecuteToJson(Json::Value& result) |
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278 { |
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279 ExecuteInternal(1); |
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280 PopJson(result, context_.lua_, lua_gettop(context_.lua_)); |
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281 } |
386 | 282 } |