Mercurial > hg > orthanc
annotate Core/Lua/LuaFunctionCall.cpp @ 1489:1389834e130f
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 04 Aug 2015 12:22:08 +0200 |
| parents | f967bdf8534e |
| children | 9ea3d082b064 |
| rev | line source |
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| 386 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
| 386 | 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> |
| 386 | 39 |
| 40 namespace Orthanc | |
| 41 { | |
| 42 void LuaFunctionCall::CheckAlreadyExecuted() | |
| 43 { | |
| 44 if (isExecuted_) | |
| 45 { | |
| 46 throw LuaException("Arguments cannot be pushed after the function is executed"); | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 LuaFunctionCall::LuaFunctionCall(LuaContext& context, | |
| 51 const char* functionName) : | |
| 52 context_(context), | |
| 53 isExecuted_(false) | |
| 54 { | |
| 55 // Clear the stack to fulfill the invariant | |
| 56 lua_settop(context_.lua_, 0); | |
| 57 lua_getglobal(context_.lua_, functionName); | |
| 58 } | |
| 59 | |
| 60 void LuaFunctionCall::PushString(const std::string& value) | |
| 61 { | |
| 62 CheckAlreadyExecuted(); | |
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63 lua_pushlstring(context_.lua_, value.c_str(), value.size()); |
| 386 | 64 } |
| 65 | |
| 66 void LuaFunctionCall::PushBoolean(bool value) | |
| 67 { | |
| 68 CheckAlreadyExecuted(); | |
| 69 lua_pushboolean(context_.lua_, value); | |
| 70 } | |
| 71 | |
| 72 void LuaFunctionCall::PushInteger(int value) | |
| 73 { | |
| 74 CheckAlreadyExecuted(); | |
| 75 lua_pushinteger(context_.lua_, value); | |
| 76 } | |
| 77 | |
| 78 void LuaFunctionCall::PushDouble(double value) | |
| 79 { | |
| 80 CheckAlreadyExecuted(); | |
| 81 lua_pushnumber(context_.lua_, value); | |
| 82 } | |
| 83 | |
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84 void LuaFunctionCall::PushJson(const Json::Value& value) |
| 386 | 85 { |
| 86 CheckAlreadyExecuted(); | |
| 1051 | 87 context_.PushJson(value); |
| 386 | 88 } |
| 89 | |
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90 void LuaFunctionCall::ExecuteInternal(int numOutputs) |
| 386 | 91 { |
| 92 CheckAlreadyExecuted(); | |
| 93 | |
| 94 assert(lua_gettop(context_.lua_) >= 1); | |
| 95 int nargs = lua_gettop(context_.lua_) - 1; | |
| 96 int error = lua_pcall(context_.lua_, nargs, numOutputs, 0); | |
| 97 | |
| 98 if (error) | |
| 99 { | |
| 100 assert(lua_gettop(context_.lua_) >= 1); | |
| 101 | |
| 102 std::string description(lua_tostring(context_.lua_, -1)); | |
| 103 lua_pop(context_.lua_, 1); /* pop error message from the stack */ | |
| 104 throw LuaException(description); | |
| 105 } | |
| 106 | |
| 107 if (lua_gettop(context_.lua_) < numOutputs) | |
| 108 { | |
| 109 throw LuaException("The function does not give the expected number of outputs"); | |
| 110 } | |
| 111 | |
| 112 isExecuted_ = true; | |
| 113 } | |
| 114 | |
| 115 bool LuaFunctionCall::ExecutePredicate() | |
| 116 { | |
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117 ExecuteInternal(1); |
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118 |
| 386 | 119 if (!lua_isboolean(context_.lua_, 1)) |
| 120 { | |
| 121 throw LuaException("The function is not a predicate (only true/false outputs allowed)"); | |
| 122 } | |
| 123 | |
| 124 return lua_toboolean(context_.lua_, 1) != 0; | |
| 125 } | |
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126 |
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127 |
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128 void LuaFunctionCall::ExecuteToJson(Json::Value& result) |
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129 { |
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130 ExecuteInternal(1); |
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131 context_.GetJson(result, lua_gettop(context_.lua_)); |
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132 } |
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133 |
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134 |
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135 void LuaFunctionCall::ExecuteToString(std::string& result) |
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136 { |
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137 ExecuteInternal(1); |
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138 |
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139 int top = lua_gettop(context_.lua_); |
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140 if (lua_isstring(context_.lua_, top)) |
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141 { |
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142 result = lua_tostring(context_.lua_, top); |
| 1010 | 143 } |
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144 else |
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145 { |
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146 throw LuaException("The function does not return a string"); |
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147 } |
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148 } |
| 386 | 149 } |