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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.

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/*
 * Copyright 2000-2014 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.intellij.lang.ASTNode;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.psi.PyElementVisitor;
import com.jetbrains.python.psi.PyExpression;
import com.jetbrains.python.psi.PyYieldExpression;
import com.jetbrains.python.psi.types.PyType;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.NotNull;

/**
 * @author yole
 */
public class PyYieldExpressionImpl extends PyElementImpl implements PyYieldExpression {
  public PyYieldExpressionImpl(ASTNode astNode) {
    super(astNode);
  }

  protected void acceptPyVisitor(PyElementVisitor pyVisitor) {
    pyVisitor.visitPyYieldExpression(this);
  }

  @Override
  public PyExpression getExpression() {
    final PyExpression[] expressions = PsiTreeUtil.getChildrenOfType(this, PyExpression.class);
    return (expressions != null && expressions.length > 0) ? expressions[0] : null;
  }

  @Override
  public boolean isDelegating() {
    return getNode().findChildByType(PyTokenTypes.FROM_KEYWORD) != null;
  }

  @Override
  public PyType getType(@NotNull TypeEvalContext context, @NotNull TypeEvalContext.Key key) {
    final PyExpression e = getExpression();
    return e != null ? context.getType(e) : null;
  }
}