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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package com.oracle.js.parser.ir;

// @formatter:off
/**
 * Interface implemented by all nodes that have flags in
 * a lexical context. This is needed as we sometimes have to save
 * the setting of flags in the lexical context until a block
 * is completely finished and its final version (after multiple
 * copy on writes) is placed in the lexical context
 *
 * @param <T> lexical context node that can have flags set during code generation
 */
public interface Flags<T extends LexicalContextNode> {

    /**
     * Get all flags of a LexicalContextNode
     * @return flags
     */
    int getFlags();

    /**
     * Check if a flag is set in a lexical context node
     * @param flag flag to check
     * @return flags
     */
    boolean getFlag(int flag);

    /**
     * Set a flag of a LexicalContextNode
     * @param lc lexical context
     * @param flag flag to set
     * @return the new LexicalContext node if flags were changed, same otherwise
     */
    T setFlag(final LexicalContext lc, int flag);

    /**
     * Set all flags of a LexicalContextNode, overwriting previous flags
     * @param lc lexical context
     * @param flags new flags value
     * @return the new LexicalContext node if flags were changed, same otherwise
     */
    T setFlags(final LexicalContext lc, int flags);
}
