java_cup.runtime.ScannerBuffer Maven / Gradle / Ivy

Go to download
package java_cup.runtime;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

public class ScannerBuffer implements Scanner {
    private Scanner inner;
    private List buffer = new LinkedList();

    /**
     * Wraps around a custom scanner and stores all so far produced tokens in a buffer
     *
     * @param inner the scanner to buffer
     */
    public ScannerBuffer(Scanner inner) {
        this.inner = inner;
    }

    /**
     * Read-Only access to the buffered Symbols
     *
     * @return an unmodifiable Version of the buffer
     */
    public List getBuffered() {
        return Collections.unmodifiableList(buffer);
    }

    @Override
    public Symbol next_token() throws Exception {
        Symbol buffered = inner.next_token();
        buffer.add(buffered);
        return buffered;
    }

}