content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.codegen.expression.impl;
  
  import io.activej.codegen.Context;
  import io.activej.codegen.expression.Expression;
  import io.activej.common.annotation.ExposedInternals;
  import org.objectweb.asm.Type;
  import org.objectweb.asm.commons.GeneratorAdapter;
  
  import java.util.List;
  
  import static io.activej.codegen.util.TypeChecks.checkType;
  import static io.activej.codegen.util.TypeChecks.isNotThrow;
  import static org.objectweb.asm.Type.VOID_TYPE;
  
  /**
   * Defines methods which allow to use several methods one after the other
   */
  @ExposedInternals
  public final class Sequence implements Expression {
  	public final List<Expression> expressions;
  
  	public Sequence(List<Expression> expressions) {
  		this.expressions = expressions;
  	}
  
  	@Override
  	public Type load(Context ctx) {
  		GeneratorAdapter g = ctx.getGeneratorAdapter();
  
  		Type type = VOID_TYPE;
  		for (int i = 0; i < expressions.size(); i++) {
  			Expression expression = expressions.get(i);
  			type = expression.load(ctx);
  			if (i != expressions.size() - 1) {
  				checkType(type, isNotThrow(), "There are additional expressions in a sequence after a 'throw' exception");
  
  				if (type.getSize() == 1)
  					g.pop();
  				if (type.getSize() == 2)
  					g.pop2();
  			}
  		}
  
  		return type;
  	}
  }
  