| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.jetbrains.python.psi.impl; |
| |
| import com.jetbrains.python.psi.PyBoolLiteralExpression; |
| import com.jetbrains.python.psi.PyExpression; |
| import com.jetbrains.python.psi.PyNumericLiteralExpression; |
| import com.jetbrains.python.psi.PyReferenceExpression; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.math.BigInteger; |
| |
| /** |
| * TODO: Merge PythonDataflowUtil, {@link com.jetbrains.python.psi.impl.PyConstantExpressionEvaluator} and {@link com.jetbrains.python.psi.impl.PyEvaluator} and all its inheritors and improve Abstract Interpretation |
| * @author yole |
| */ |
| public class PyConstantExpressionEvaluator { |
| private PyConstantExpressionEvaluator() { |
| } |
| |
| @Nullable |
| public static Object evaluate(final PyExpression expr) { |
| if (expr instanceof PyNumericLiteralExpression) { |
| final PyNumericLiteralExpression numericLiteral = (PyNumericLiteralExpression)expr; |
| if (numericLiteral.isIntegerLiteral()) { |
| final BigInteger value = numericLiteral.getBigIntegerValue(); |
| if ((long)value.intValue() == value.longValue()) { |
| return value.intValue(); |
| } |
| } |
| } |
| if (expr instanceof PyBoolLiteralExpression) { |
| return ((PyBoolLiteralExpression)expr).getValue(); |
| } |
| if (expr instanceof PyReferenceExpression) { |
| final String text = expr.getText(); |
| if ("true".equals(text) || "True".equals(text)) { |
| return true; |
| } |
| if ("false".equals(text) || "False".equals(text)) { |
| return false; |
| } |
| } |
| return null; |
| } |
| |
| public static boolean evaluateBoolean(final PyExpression expr, boolean defaultValue) { |
| Object result = evaluate(expr); |
| if (result instanceof Boolean) { |
| return (Boolean)result; |
| } |
| else { |
| return defaultValue; |
| } |
| } |
| |
| public static boolean evaluateBoolean(final PyExpression expr) { |
| return evaluateBoolean(expr, true); |
| } |
| } |