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/*
* [The "BSD license"]
* Copyright (c) 2013 Terence Parr
* Copyright (c) 2013 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.runtime.atn;
import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.misc.MurmurHash;
/**
* Implements the {@code mode} lexer action by calling {@link Lexer#mode} with
* the assigned mode.
*
* @author Sam Harwell
* @since 4.2
*/
public final class LexerModeAction implements LexerAction {
private final int mode;
/**
* Constructs a new {@code mode} action with the specified mode value.
* @param mode The mode value to pass to {@link Lexer#mode}.
*/
public LexerModeAction(int mode) {
this.mode = mode;
}
/**
* Get the lexer mode this action should transition the lexer to.
*
* @return The lexer mode for this {@code mode} command.
*/
public int getMode() {
return mode;
}
/**
* {@inheritDoc}
* @return This method returns {@link LexerActionType#MODE}.
*/
@Override
public LexerActionType getActionType() {
return LexerActionType.MODE;
}
/**
* {@inheritDoc}
* @return This method returns {@code false}.
*/
@Override
public boolean isPositionDependent() {
return false;
}
/**
* {@inheritDoc}
*
* <p>This action is implemented by calling {@link Lexer#mode} with the
* value provided by {@link #getMode}.</p>
*/
@Override
public void execute(Lexer lexer) {
lexer.mode(mode);
}
@Override
public int hashCode() {
int hash = MurmurHash.initialize();
hash = MurmurHash.update(hash, getActionType().ordinal());
hash = MurmurHash.update(hash, mode);
return MurmurHash.finish(hash, 2);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
else if (!(obj instanceof LexerModeAction)) {
return false;
}
return mode == ((LexerModeAction)obj).mode;
}
@Override
public String toString() {
return String.format("mode(%d)", mode);
}
}
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