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Shift format ECMAScript 2018 AST tooling

There is a newer version: 2.0.4

/*
 * Copyright 2014 Shape Security, Inc.
 *
 * 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.shapesecurity.shift.es2018.parser;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public abstract class Token {
    @Nonnull
    public final TokenType type;
    @Nonnull
    public final SourceRange slice;
    @Nullable
    public SourceRange leadingWhitespace;

    protected Token(@Nonnull TokenType type,
                    @Nonnull SourceRange slice) {
        this.type = type;
        this.slice = slice;
    }

    @Nonnull
    public abstract CharSequence getValueString();

    @Override
    @Nonnull
    public String toString() {
        return this.slice.getString().toString();
    }
}