| /***** BEGIN LICENSE BLOCK ***** |
| * Version: CPL 1.0/GPL 2.0/LGPL 2.1 |
| * |
| * The contents of this file are subject to the Common 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/cpl-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) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.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 |
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| ***** END LICENSE BLOCK *****/ |
| package org.jruby.util; |
| |
| public final class IdUtil { |
| public static final int CONSTANT = 0; |
| public static final int INSTANCE_VAR = 1; |
| public static final int CLASS_VAR = 2; |
| public static final int GLOBAL_VAR = 4; |
| public static final int LOCAL_VAR = 8; |
| |
| /** |
| * Get type of variable based on Ruby naming conventions. This is useful when you know |
| * you are going to want to know what type it is. It should in theory be cheaper than |
| * calling all the isFoo methods seperately. It also should be faster than isLocal. |
| * |
| * @param id the name to determine its type from |
| * @return value representing the type. |
| */ |
| public static int getVarType(String id) { |
| char c = id.charAt(0); |
| |
| switch (c) { |
| case '@': |
| return id.charAt(1) == '@' ? CLASS_VAR : INSTANCE_VAR; |
| case '$': |
| return GLOBAL_VAR; |
| } |
| |
| return Character.isUpperCase(c) ? CONSTANT : LOCAL_VAR; |
| } |
| |
| /** |
| * rb_is_const_id and is_const_id |
| */ |
| public static boolean isConstant(String id) { |
| return Character.isUpperCase(id.charAt(0)); |
| } |
| |
| /** |
| * rb_is_class_id and is_class_id |
| */ |
| public static boolean isClassVariable(String id) { |
| return id.length()>1 && id.charAt(0) == '@' && id.charAt(1) == '@'; |
| } |
| |
| /** |
| * rb_is_instance_id and is_instance_id |
| */ |
| public static boolean isInstanceVariable(String id) { |
| return id.length()>0 && id.charAt(0) == '@' && (id.length() < 2 || id.charAt(1) != '@'); |
| } |
| |
| /** |
| * rb_is_global_id and is_global_id |
| */ |
| public static boolean isGlobal(String id) { |
| return id.length()>0 && id.charAt(0) == '$'; |
| } |
| |
| /** |
| * rb_is_local_id and is_local_id |
| */ |
| public static boolean isLocal(String id) { |
| return !isGlobal(id) && !isClassVariable(id) && !isInstanceVariable(id) && !isConstant(id); |
| } |
| |
| public static boolean isAttrSet(String id) { |
| return id.endsWith("="); |
| } |
| } |