/*
 * Anarres C Preprocessor
 * Copyright (c) 2007-2008, 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.
 */

package org.anarres.cpp;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.io.StringReader;

import java.util.Arrays;
import java.util.List;
import java.util.Iterator;

/* pp */ class FixedTokenSource extends Source {
	private static final Token	EOF =
			new Token(Token.EOF, "<ts-eof>");

	private List<Token>	tokens;
	private int			idx;

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

	/* pp */ FixedTokenSource(List<Token> tokens) {
		this.tokens = tokens;
		this.idx = 0;
	}

	public Token token()
						throws IOException,
								LexerException {
		if (idx >= tokens.size())
			return EOF;
		return tokens.get(idx++);
	}

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