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) 2006 Ola Bini 
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 /***** 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) 2006 Ola Bini <ola@ologix.com>
 *
 * 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.runtime;

import org.jruby.RubyModule;
import org.jruby.parser.StaticScope;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ArraySupport;

A Block implemented using a Java-based BlockCallback implementation. For
lightweight block logic within Java code.
/**
 * A Block implemented using a Java-based BlockCallback implementation. For
 * lightweight block logic within Java code.
 */
public class CallBlock extends BlockBody {
    private final BlockCallback callback;
    private final StaticScope dummyScope;

    public static Block newCallClosure(IRubyObject self, RubyModule imClass, Signature signature, BlockCallback callback, ThreadContext context) {
        return newCallClosure(context, self, signature, callback);
    }

    public static Block newCallClosure(ThreadContext context, IRubyObject self, Signature signature, BlockCallback callback) {
        Binding binding = context.currentBinding(self, Visibility.PUBLIC);
        BlockBody body = new CallBlock(context, signature, callback);

        return new Block(body, binding);
    }

    @Deprecated
    public static Block newCallClosure(IRubyObject self, RubyModule imClass, Arity arity, BlockCallback callback, ThreadContext context) {
        return newCallClosure(self, imClass, Signature.from(arity), callback, context);
    }

    private CallBlock(ThreadContext context, Signature signature, BlockCallback callback) {
        super(signature);
        this.callback = callback;
        this.dummyScope = context.runtime.getStaticScopeFactory().getDummyScope();
    }

    static IRubyObject[] adjustArgs(Block block, IRubyObject[] args) {
        Signature signature = block.getSignature();
        int required = signature.required();
        if (required > 0 && required < args.length && signature.isFixed()) args = ArraySupport.newCopy(args, required);

        return args;
    }

    @Override
    public IRubyObject call(ThreadContext context, Block block, IRubyObject[] args) {
        return callback.call(context, adjustArgs(block, args), Block.NULL_BLOCK);
    }

    @Override
    public IRubyObject call(ThreadContext context, Block block, IRubyObject[] args, Block blockArg) {
        return callback.call(context, adjustArgs(block, args), blockArg);
    }

    @Override
    public IRubyObject yieldSpecific(ThreadContext context, Block block) {
        return callback.call(context, IRubyObject.NULL_ARRAY, Block.NULL_BLOCK);
    }

    @Override
    public IRubyObject yieldSpecific(ThreadContext context, Block block, IRubyObject arg0) {
        return callback.call(context, arg0, Block.NULL_BLOCK);
    }

    @Override
    protected IRubyObject doYield(ThreadContext context, Block block, IRubyObject value) {
        return callback.call(context, value, Block.NULL_BLOCK);
    }

    @Override
    protected IRubyObject doYield(ThreadContext context, Block block, IRubyObject[] args, IRubyObject self) {
        return callback.call(context, adjustArgs(block, args), Block.NULL_BLOCK);
    }

    public StaticScope getStaticScope() {
        return dummyScope;
    }

    public void setStaticScope(StaticScope newScope) {
        // ignore
    }

    public String getFile() {
        return "(internal)";
    }

    public int getLine() {
        return -1;
    }
}