Basic implementation of NSPredicate and related classes

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@22880 72102866-910b-0410-8b05-ffd578937521

Headers/Foundation/NSExpression.h

@@ -0,0 +1,63 @@
+/* Interface for NSExpression for GNUStep
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+   Written by:  Dr. H. Nikolaus Schaller
+   Created: 2005
+   
+   This file is part of the GNUstep Base Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02111 USA.
+   */ 
+
+#ifndef __NSExpression_h_GNUSTEP_BASE_INCLUDE
+#define __NSExpression_h_GNUSTEP_BASE_INCLUDE
+
+#include <Foundation/NSPredicate.h>
+
+@class NSMutableDictionary;
+
+typedef enum _NSExpressionType
+{
+  NSConstantValueExpressionType=0,
+  NSEvaluatedObjectExpressionType,
+  NSVariableExpressionType,
+  NSKeyPathExpressionType,
+  NSFunctionExpressionType
+} NSExpressionType;
+
+@interface NSExpression : NSObject <NSCoding, NSCopying>
+
++ (NSExpression *) expressionForConstantValue: (id)obj;
++ (NSExpression *) expressionForEvaluatedObject;
++ (NSExpression *) expressionForFunction: (NSString *)name
+			       arguments: (NSArray *)args;
++ (NSExpression *) expressionForKeyPath: (NSString *)path;
++ (NSExpression *) expressionForVariable: (NSString *)string;
+
+- (NSArray *) arguments;
+- (id) constantValue;
+- (NSExpressionType) expressionType;
+- (id) expressionValueWithObject: (id)object
+			 context: (NSMutableDictionary *)context;
+- (NSString *) function;
+- (id) initWithExpressionType: (NSExpressionType) type;
+- (NSString *) keyPath;
+- (NSExpression *) operand;
+- (NSString *) variable;
+
+@end
+#endif /* __NSExpression_h_GNUSTEP_BASE_INCLUDE */
+