org.jetbrains.jet.lang.psi.JetCallExpression Maven / Gradle / Ivy

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/*
 * Copyright 2010-2013 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 org.jetbrains.jet.lang.psi;

import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.util.SmartList;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jet.JetNodeTypes;
import org.jetbrains.jet.lexer.JetTokens;

import java.util.Collections;
import java.util.List;

public class JetCallExpression extends JetReferenceExpression implements JetCallElement {
    public JetCallExpression(@NotNull ASTNode node) {
        super(node);
    }

    @Override
    public  R accept(@NotNull JetVisitor visitor, D data) {
        return visitor.visitCallExpression(this, data);
    }

    @Override
    @Nullable
    public JetExpression getCalleeExpression() {
        return findChildByClass(JetExpression.class);
    }

    @Override
    @Nullable
    public JetValueArgumentList getValueArgumentList() {
        return (JetValueArgumentList) findChildByType(JetNodeTypes.VALUE_ARGUMENT_LIST);
    }

    @Nullable
    public JetTypeArgumentList getTypeArgumentList() {
        return (JetTypeArgumentList) findChildByType(JetNodeTypes.TYPE_ARGUMENT_LIST);
    }

    /**
     * Normally there should be only one (or zero) function literal arguments.
     * The returned value is a list for better handling of commonly made mistake of a function taking a lambda and returning another function.
     * Most of users can simply ignore lists of more than one element.
     */
    @Override
    @NotNull
    public List getFunctionLiteralArguments() {
        JetExpression calleeExpression = getCalleeExpression();
        ASTNode node;
        if (calleeExpression instanceof JetFunctionLiteralExpression) {
            node = calleeExpression.getNode().getTreeNext();
        }
        else {
            node = getNode().getFirstChildNode();
        }
        List result = new SmartList();
        while (node != null) {
            PsiElement psi = node.getPsi();
            if (psi instanceof JetFunctionLiteralExpression) {
                result.add((JetFunctionLiteralExpression) psi);
            }
            else if (psi instanceof JetLabeledExpression) {
                JetLabeledExpression labeledExpression = (JetLabeledExpression) psi;
                JetExpression baseExpression = labeledExpression.getBaseExpression();
                if (baseExpression instanceof JetFunctionLiteralExpression) {
                    result.add(labeledExpression);
                }
            }
            node = node.getTreeNext();
        }
        return result;
    }

    @Override
    @NotNull
    public List getValueArguments() {
        JetValueArgumentList list = getValueArgumentList();
        return list != null ? list.getArguments() : Collections.emptyList();
    }

    @NotNull
    public List getTypeArguments() {
        JetTypeArgumentList list = getTypeArgumentList();
        return list != null ? list.getArguments() : Collections.emptyList();
    }
}