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/*
 * Copyright (c) 2010, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * SOFTWARE.
 */

package com.oracle.js.parser.ir;

import com.oracle.js.parser.ir.visitor.NodeVisitor;
import com.oracle.js.parser.ir.visitor.TranslatorNodeVisitor;

/**
 * IR representation for throw statements.
 */
public final class ThrowNode extends Statement {
    /** Exception expression. */
    private final Expression expression;

    private final boolean isSyntheticRethrow;

    /**
     * Constructor
     *
     * @param lineNumber line number
     * @param token token
     * @param finish finish
     * @param expression expression to throw
     * @param isSyntheticRethrow true if this throw node is part of a synthetic rethrow.
     */
    public ThrowNode(final int lineNumber, final long token, final int finish, final Expression expression, final boolean isSyntheticRethrow) {
        super(lineNumber, token, finish);
        this.expression = expression;
        this.isSyntheticRethrow = isSyntheticRethrow;
    }

    private ThrowNode(final ThrowNode node, final Expression expression, final boolean isSyntheticRethrow) {
        super(node);
        this.expression = expression;
        this.isSyntheticRethrow = isSyntheticRethrow;
    }

    @Override
    public boolean isTerminal() {
        return true;
    }

    /**
     * Assist in IR navigation.
     *
     * @param visitor IR navigating visitor.
     */
    @Override
    public Node accept(final NodeVisitor visitor) {
        if (visitor.enterThrowNode(this)) {
            return visitor.leaveThrowNode(setExpression((Expression) expression.accept(visitor)));
        }

        return this;
    }

    @Override
    public  R accept(TranslatorNodeVisitor visitor) {
        return visitor.enterThrowNode(this);
    }

    @Override
    public void toString(final StringBuilder sb, final boolean printType) {
        sb.append("throw ");

        if (expression != null) {
            expression.toString(sb, printType);
        }
    }

    /**
     * Get the expression that is being thrown by this node
     *
     * @return expression
     */
    public Expression getExpression() {
        return expression;
    }

    /**
     * Reset the expression being thrown by this node
     *
     * @param expression new expression
     * @return new or same thrownode
     */
    public ThrowNode setExpression(final Expression expression) {
        if (this.expression == expression) {
            return this;
        }
        return new ThrowNode(this, expression, isSyntheticRethrow);
    }

    /**
     * Is this a throw a synthetic rethrow in a synthetic catch-all block created when inlining
     * finally statements? In that case we never wrap whatever is thrown into an ECMAException, just
     * rethrow it.
     *
     * @return true if synthetic throw node
     */
    public boolean isSyntheticRethrow() {
        return isSyntheticRethrow;
    }

    @Override
    public boolean isCompletionValueNeverEmpty() {
        return true;
    }
}