1 // Copyright (C) 2014-2017 CEA/DEN, EDF R&D
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Lesser General Public
5 // License as published by the Free Software Foundation; either
6 // version 2.1 of the License, or (at your option) any later version.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Lesser General Public License for more details.
13 // You should have received a copy of the GNU Lesser General Public
14 // License along with this library; if not, write to the Free Software
15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 // See http://www.salome-platform.org/ or
18 // email : webmaster.salome@opencascade.com<mailto:webmaster.salome@opencascade.com>
21 #include <InitializationPlugin_PyInterp.h>
27 InitializationPlugin_PyInterp::InitializationPlugin_PyInterp()
32 InitializationPlugin_PyInterp::~InitializationPlugin_PyInterp()
36 const char* aSearchCode =
38 "class FindName(ast.NodeVisitor):\n"
39 " def __init__(self, name):\n"
41 " def visit_Name(self, node):\n"
42 " if node.id == self.name:\n"
43 " positions.append((node.lineno, node.col_offset))\n"
44 "FindName(name).visit(ast.parse(expression))";
46 // make the expression be correct for the python interpreter even for the
47 // beta=alfa*2 expressions
48 static std::string adjustExpression(const std::string& theExpression) {
49 std::string anExpression = theExpression;
50 if (!anExpression.empty() && anExpression.back() == '=') {
51 anExpression = anExpression.substr(0, anExpression.length() - 1);
56 std::list<std::pair<int, int> >
57 InitializationPlugin_PyInterp::positions(const std::string& theExpression,
58 const std::string& theName)
60 PyLockWrapper lck; // Acquire GIL until the end of the method
62 std::list<std::pair<int, int> > aResult;
65 PyObject* aContext = PyDict_New();
66 PyDict_SetItemString(aContext, "__builtins__", PyEval_GetBuiltins());
68 std::string anExpression = adjustExpression(theExpression);
69 // extend aContext with variables
70 PyDict_SetItemString(aContext, "expression", PyUnicode_FromString(anExpression.c_str()));
71 PyDict_SetItemString(aContext, "name", PyUnicode_FromString(theName.c_str()));
72 PyDict_SetItemString(aContext, "positions", Py_BuildValue("[]"));
74 // run the search code
75 PyObject* aExecResult = PyRun_String(aSearchCode, Py_file_input, aContext, aContext);
76 Py_XDECREF(aExecResult);
78 // receive results from context
79 PyObject* aPositions = PyDict_GetItemString(aContext, "positions");
80 for (int anIndex = 0; anIndex < PyList_Size(aPositions); ++anIndex) {
81 PyObject* aPosition = PyList_GetItem(aPositions, anIndex);
82 PyObject* aLineNo = PyTuple_GetItem(aPosition, 0);
83 PyObject* aColOffset = PyTuple_GetItem(aPosition, 1);
86 std::pair<int, int>((int)PyLong_AsLong(aLineNo),
87 (int)PyLong_AsLong(aColOffset)));
90 // TODO(spo): after this refCount of the variable is not 0. Is there memory leak?
97 std::list<std::string> InitializationPlugin_PyInterp::compile(const std::string& theExpression)
99 PyLockWrapper lck; // Acquire GIL until the end of the method
100 std::list<std::string> aResult;
101 PyObject *aCodeopModule = PyImport_AddModule("codeop");
102 if(!aCodeopModule) { // Fatal error. No way to go on.
106 // support "variable_name=" expression as "variable_name"
107 std::string anExpression = adjustExpression(theExpression);
109 PyObject *aCodePyObj =
110 PyObject_CallMethod(aCodeopModule, (char*)"compile_command", (char*)"(s)",
111 anExpression.c_str());
113 if(!aCodePyObj || aCodePyObj == Py_None || !PyCode_Check(aCodePyObj)) {
114 Py_XDECREF(aCodePyObj);
118 PyCodeObject* aCodeObj = (PyCodeObject*) aCodePyObj;
119 std::string aCodeName(PyBytes_AsString(aCodeObj->co_code));
120 // co_names should be tuple, but can be changed in modern versions of python (>2.7.3)
121 if(!PyTuple_Check(aCodeObj->co_names)) {
125 size_t params_size = PyTuple_Size(aCodeObj->co_names);
126 if (params_size > 0) {
127 for (size_t i = 0; i < params_size; i++) {
128 PyObject* aParamObj = PyTuple_GetItem(aCodeObj->co_names, i);
129 PyObject* aParamObjStr = PyObject_Str(aParamObj);
130 std::string aParamName(PyUnicode_AsUTF8(aParamObjStr));
131 aResult.push_back(aParamName);
132 Py_XDECREF(aParamObjStr);
135 Py_XDECREF(aCodeObj);
139 void InitializationPlugin_PyInterp::extendLocalContext(const std::list<std::string>& theParameters)
141 PyLockWrapper lck; // Acquire GIL until the end of the method
142 if (theParameters.empty())
144 std::list<std::string>::const_iterator it = theParameters.begin();
145 for ( ; it != theParameters.cend(); it++) {
146 std::string aParamValue = *it;
147 simpleRun(aParamValue.c_str(), false);
151 void InitializationPlugin_PyInterp::clearLocalContext()
154 PyDict_Clear(_local_context);
157 double InitializationPlugin_PyInterp::evaluate(const std::string& theExpression,
158 std::string& theError)
160 // support "variable_name=" expression as "variable_name"
161 std::string anExpression = adjustExpression(theExpression);
163 PyLockWrapper lck; // Acquire GIL until the end of the method
164 PyCompilerFlags aFlags = {CO_FUTURE_DIVISION};
165 aFlags.cf_flags = CO_FUTURE_DIVISION;
166 PyCodeObject* anExprCode = (PyCodeObject *) Py_CompileStringFlags(anExpression.c_str(),
167 "<string>", Py_eval_input, &aFlags);
169 theError = errorMessage();
170 Py_XDECREF(anExprCode);
174 PyObject* anEvalResult = PyEval_EvalCode((PyObject *)anExprCode, _global_context, _local_context);
176 theError = errorMessage();
177 Py_XDECREF(anExprCode);
178 Py_XDECREF(anEvalResult);
182 PyObject* anEvalStrObj = PyObject_Str(anEvalResult);
183 std::string anEvalStr(PyUnicode_AsUTF8(anEvalStrObj));
184 Py_XDECREF(anExprCode);
185 Py_XDECREF(anEvalResult);
186 Py_XDECREF(anEvalStrObj);
189 // set locale due to the #2485
190 std::string aCurLocale = std::setlocale(LC_NUMERIC, 0);
191 std::setlocale(LC_NUMERIC, "C");
192 result = std::stod(anEvalStr);
193 std::setlocale(LC_NUMERIC, aCurLocale.c_str());
195 catch (const std::invalid_argument&) {
196 theError = "Unable to eval " + anEvalStr;
202 std::string InitializationPlugin_PyInterp::errorMessage()
204 std::string aPyError;
205 if (PyErr_Occurred()) {
206 PyObject *pstr, *ptype, *pvalue, *ptraceback;
207 PyErr_Fetch(&ptype, &pvalue, &ptraceback);
208 PyErr_NormalizeException(&ptype, &pvalue, &ptraceback);
209 pstr = PyObject_Str(pvalue);
210 aPyError = std::string(PyUnicode_AsUTF8(pstr));
214 Py_XDECREF(ptraceback);
219 bool InitializationPlugin_PyInterp::initContext()
221 PyObject *m = PyImport_AddModule("__main__"); // interpreter main module (module context)
226 _global_context = PyModule_GetDict(m); // get interpreter global variable context
227 Py_INCREF(_global_context);
228 _local_context = PyDict_New();
229 Py_INCREF(_local_context);
231 return PyRun_SimpleString("from math import *") == 0;
234 void InitializationPlugin_PyInterp::closeContext()
236 Py_XDECREF(_local_context);
237 PyInterp_Interp::closeContext();