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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) 2001 Alan Moore <alan_moore@gmx.net> Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de> Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se> Copyright (C) 2004 Thomas E Enebo <enebo@acm.org> Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de> 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.util;
 
 import org.jruby.Ruby;

Author(s):
jpetersen
 
 public final class ArgsUtil {
     public static IRubyObject[] convertToJavaArray(IRubyObject value) {
         if (value == null) {
         	return .;
         }
         
         if (value instanceof RubyArray) {
             return ((RubyArray)value).toJavaArrayMaybeUnsafe();
         }
         
         return new IRubyObject[] { value };
     }

    
This name may be a bit misleading, since this also attempts to coerce array behavior using to_ary.

Parameters:
runtime The JRuby runtime
value The value to convert
coerce Whether to coerce using to_ary or just wrap with an array
 
     public static RubyArray convertToRubyArray(Ruby runtimeIRubyObject valueboolean coerce) {
         if (value == null) {
             return RubyArray.newEmptyArray(runtime);
         }
         
         if (coercereturn convertToRubyArrayWithCoerce(runtimevalue);
 
         // don't attempt to coerce to array, just wrap and return
         return RubyArray.newArrayLight(runtimevalue);
     }
     
     public static RubyArray convertToRubyArrayWithCoerce(Ruby runtimeIRubyObject value) {
         if (value instanceof RubyArrayreturn ((RubyArray)value);
         
         IRubyObject newValue = TypeConverter.convertToType(valueruntime.getArray(), "to_ary"false);
 
         if (newValue.isNil()) {
             return RubyArray.newArrayLight(runtimevalue);
         }
         
         // must be array by now, or error
         if (!(newValue instanceof RubyArray)) {
             throw runtime.newTypeError(newValue.getMetaClass() + "#" + "to_ary" + " should return Array");
         }
         
         return (RubyArray)newValue;
     }
     
     public static RubyArray convertToRubyArray19(Ruby runtimeIRubyObject valueboolean coerce) {
         if (value == null) {
             return RubyArray.newEmptyArray(runtime);
         }
         
         if (coercereturn convertToRubyArrayWithCoerce19(runtimevalue);
 
         // don't attempt to coerce to array, just wrap and return
        return RubyArray.newArrayLight(runtimevalue);
    }
    
    public static RubyArray convertToRubyArrayWithCoerce19(Ruby runtimeIRubyObject value) {
        if (value instanceof RubyArrayreturn ((RubyArray)value);
        
        IRubyObject newValue = TypeConverter.convertToType19(valueruntime.getArray(), "to_ary"false);
        if (newValue.isNil()) {
            return RubyArray.newArrayLight(runtimevalue);
        }
        
        // must be array by now, or error
        if (!(newValue instanceof RubyArray)) {
            throw runtime.newTypeError(newValue.getMetaClass() + "#" + "to_ary" + " should return Array");
        }
        
        return (RubyArray)newValue;
    }    
    
    
Remove first element from array

Parameters:
array to have first element "popped" off
Returns:
all but first element of the supplied array
    public static IRubyObject[] popArray(IRubyObject[] array) {
    	if (array == null || array.length == 0) {
    		return .;
    	}
    	
    	IRubyObject[] newArray = new IRubyObject[array.length - 1];
    	System.arraycopy(array, 1, newArray, 0, array.length - 1);
    	
    	return newArray;
    }
    
    public static int arrayLength(IRubyObject node) {
        return node instanceof RubyArray ? ((RubyArray)node).getLength() : 0;
    }
    
    public static IRubyObject getOptionsArg(Ruby runtimeIRubyObject... args) {
        if (args.length >= 1) {
            return TypeConverter.checkHashType(runtimeargs[args.length - 1]);
            
        }
        return runtime.getNil();
    }
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