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GLSL Preprocessing with the C Preprocessor in Java - based on JCPP

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/*
 * Anarres C Preprocessor
 * Copyright (c) 2007-2015, Shevek
 *
 * 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.
 *
 * Modified by the contributors of glsl-preprocessor.
 */
package io.github.douira.glsl_preprocessor;

import java.util.*;

class FixedTokenSource extends Source {

	private static final Token EOF = new Token(Token.EOF, "");

	private final List tokens;
	private int idx;

	FixedTokenSource(Token... tokens) {
		this.tokens = Arrays.asList(tokens);
		this.idx = 0;
	}

	FixedTokenSource(List tokens) {
		this.tokens = tokens;
		this.idx = 0;
	}

	@Override
	public Token token() {
		if (idx >= tokens.size())
			return EOF;
		return tokens.get(idx++);
	}

	@Override
	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("constant token stream ").append(tokens);
		Source parent = getParent();
		if (parent != null)
			buf.append(" in ").append(String.valueOf(parent));
		return buf.toString();
	}
}