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Shift format ECMAScript 6 AST tooling

There is a newer version: 2.2.0

/*
 * 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.parser;

import org.jetbrains.annotations.NotNull;

public class SourceRange implements CharSequence {
    public final int start;
    public final int end;
    @NotNull
    private final CharSequence source;

    public SourceRange(int start, int end, @NotNull CharSequence source) {
        this.start = start;
        this.end = end;
        this.source = source;
    }

    @Override
    public int length() {
        return this.end - this.start;
    }

    @Override
    public char charAt(int index) {
        if (index > this.end - this.start) {
            throw new IndexOutOfBoundsException();
        }
        return this.source.charAt(index + this.start);
    }

    @Override
    public CharSequence subSequence(int start, int end) {
        return new SourceRange(this.start + start, end + this.start, this.source);
    }

    @NotNull
    public CharSequence getString() {
        return this.source.subSequence(this.start, this.end);
    }

    @NotNull
    @Override
    public String toString() {
        return String.valueOf(this.getString());
    }
}