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
017package org.jetbrains.jet.lang.psi;
018
019import com.intellij.psi.PsiElement;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.annotations.Nullable;
022
023public 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}