/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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.google.idea.blaze.base.lang.buildfile.psi;

import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.util.PlatformIcons;
import javax.annotation.Nullable;
import javax.swing.Icon;

/** PSI element for an assignment statement [expr ASSIGN_OP expr] */
public class AssignmentStatement extends BuildElementImpl implements Statement {

  public AssignmentStatement(ASTNode astNode) {
    super(astNode);
  }

  /** Returns the LHS of the assignment */
  @Nullable
  public TargetExpression getLeftHandSideExpression() {
    return findChildByClass(TargetExpression.class);
  }

  /** Returns the RHS of the assignment */
  @Nullable
  public Expression getAssignedValue() {
    PsiElement psi = childToPsi(BuildElementTypes.EXPRESSIONS, 1);
    return psi instanceof Expression ? (Expression) psi : null;
  }

  @Override
  protected void acceptVisitor(BuildElementVisitor visitor) {
    visitor.visitAssignmentStatement(this);
  }

  @Nullable
  @Override
  public String getName() {
    TargetExpression target = getLeftHandSideExpression();
    return target != null ? target.getName() : super.getName();
  }

  @Override
  public Icon getIcon(int flags) {
    return PlatformIcons.FIELD_ICON;
  }
}