/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 1.0 (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-v10.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) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
 * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
 * 
 * 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.ast;

import java.util.List;
import org.jcodings.Encoding;

import org.jruby.Ruby;
import org.jruby.RubyRegexp;
import org.jruby.ast.types.ILiteralNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;
import org.jruby.util.RegexpOptions;

/** 
 * Represents a simple regular expression literal.
 */
public class RegexpNode extends Node implements ILiteralNode {
    private RubyRegexp pattern;
    private final ByteList value;
    private final RegexpOptions options;

    public RegexpNode(ISourcePosition position, ByteList value, RegexpOptions options) {
        super(position);

        this.value = value;
        this.options = options;
    }

    public Encoding getEncoding() {
        return value.getEncoding();
    }

    public NodeType getNodeType() {
        return NodeType.REGEXPNODE;
    }

    public Object accept(NodeVisitor iVisitor) {
        return iVisitor.visitRegexpNode(this);
    }

    /**
     * Gets the options.
     */
    public RegexpOptions getOptions() {
        return options;
    }

    /**
     * Gets the value.
     * @return Returns a ByteList
     */
    public ByteList getValue() {
        return value;
    }

    public RubyRegexp loadPattern(Ruby runtime) {
        // FIXME: 1.9 should care about internal or external encoding and not kcode.
        if (pattern == null || runtime.getKCode() != pattern.getKCode()) {
            setPattern(RubyRegexp.newRegexp(runtime, value, options));
        }

        return pattern;
    }

    public void setPattern(RubyRegexp p) {
        this.pattern = p;
        this.pattern.setLiteral();
    }

    public RubyRegexp getPattern() {
        return pattern;
    }
    
    public List<Node> childNodes() {
        return EMPTY_LIST;
    }

    @Override
    public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
        return loadPattern(runtime);
    }
}
