001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.jet.lang.psi;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    
023    public class JetPsiUnparsingUtils {
024        private JetPsiUnparsingUtils() {
025        }
026    
027        @NotNull
028        public static String toIf(@Nullable JetExpression condition, @Nullable JetExpression thenExpression, @Nullable JetExpression elseExpression) {
029            return toIf(
030                    JetPsiUtil.getText(condition),
031                    JetPsiUtil.getText(thenExpression),
032                    elseExpression != null ? elseExpression.getText() : null
033            );
034        }
035    
036        @NotNull
037        public static String toIf(@NotNull String condition, @NotNull String thenExpression, @Nullable String elseExpression) {
038            return "if " + parenthesizeTextIfNeeded(condition) + " " + thenExpression + (elseExpression != null ? " else " + elseExpression : "");
039        }
040    
041        @NotNull
042        public static String toBinaryExpression(@Nullable JetExpression left, @NotNull String op, @Nullable JetElement right) {
043            return toBinaryExpression(JetPsiUtil.getText(left), op, JetPsiUtil.getText(right));
044        }
045    
046        @NotNull
047        public static String toBinaryExpression(@NotNull String left, @NotNull String op, @NotNull String right) {
048            return left + " " + op + " " + right;
049        }
050    
051        @NotNull
052        public static String parenthesizeIfNeeded(@Nullable JetExpression expression) {
053            String text = JetPsiUtil.getText(expression);
054    
055            return (expression instanceof JetParenthesizedExpression ||
056                    expression instanceof JetConstantExpression ||
057                    expression instanceof JetSimpleNameExpression)
058                   ? text : "(" + text + ")";
059        }
060    
061        @NotNull
062        public static String parenthesizeTextIfNeeded(@NotNull String expressionText) {
063            return (expressionText.startsWith("(") && expressionText.endsWith(")")) ? expressionText : "(" + expressionText + ")";
064        }
065    }