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/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2004-2006 Thomas E Enebo 
 * Copyright (C) 2004 Jan Arne Petersen 
 * Copyright (C) 2004 Stefan Matthias Aust 
 * Copyright (C) 2005 Zach Dennis 
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.lexer;

import org.jcodings.Encoding;
import org.jruby.RubyArray;
import org.jruby.RubyString;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;

import java.nio.channels.Channel;

/**
 * Simple source capable of providing the next line in Ruby source file being lex'd.
 */
public abstract class LexerSource {
    // The name of this source (e.g. a filename: foo.rb)
    private final String name; // mri: parser_ruby_sourcefile

    // Offset specified where to add to actual offset
    private int lineOffset;

    protected RubyArray scriptLines;

    public LexerSource(String sourceName, int lineOffset, RubyArray scriptLines) {
        this.name = sourceName;
        this.lineOffset = lineOffset;
        this.scriptLines = scriptLines;
    }

    /**
     * What file are we lexing?
     * @return the files name
     */
    public String getFilename() {
        return name;
    }

    public int getLineOffset() {
        return lineOffset;
    }

    public void encodeExistingScriptLines(Encoding encoding) {
        if (scriptLines == null) return;

        int length = scriptLines.getLength();
        for (int i = 0; i < length; i++) {
            RubyString line = (RubyString) scriptLines.eltOk(0);

            line.setEncoding(encoding);
        }
    }

    public abstract Encoding getEncoding();

    public abstract void setEncoding(Encoding encoding);

    public abstract ByteList gets();

    public abstract int getOffset();

    public abstract Channel getRemainingAsChannel();

    public abstract IRubyObject getRemainingAsIO();
}