Add minimal version of predicate editor copied over from mySTEP.

Source/NSPredicateEditorRowTemplate.m

@@ -0,0 +1,121 @@
+/** <title>NSPredicateEditorRowTemplate</title>
+
+   <abstract>The template rows for the predicate editor</abstract>
+
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+   Author: Fred Kiefer <fredkiefer@gmx.de>
+   Date:   January 2020
+
+   This file is part of the GNUstep GUI Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; see the file COPYING.LIB.
+   If not, see <http://www.gnu.org/licenses/> or write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#import "AppKit/NSPredicateEditorRowTemplate.h"
+
+@implementation NSPredicateEditorRowTemplate
+
++ (NSArray *) templatesWithAttributeKeyPaths: (NSArray *)paths
+                         inEntityDescription: (NSEntityDescription *)entityDesc
+{
+  return nil;
+}
+
+- (NSArray *) compoundTypes
+{
+  return nil;
+}
+
+- (NSArray *) displayableSubpredicatesOfPredicate: (NSPredicate *)pred
+{
+  return nil;
+}
+
+- (id) initWithCompoundTypes: (NSArray *)types
+{
+  return self;
+}
+
+- (id) initWithLeftExpressions: (NSArray *)leftExprs
+  rightExpressionAttributeType: (NSAttributeType)attrType
+                      modifier: (NSComparisonPredicateModifier)modif
+                     operators: (NSArray *)ops
+                       options: (NSUInteger)opts;
+{
+  return self;
+}
+
+- (id) initWithLeftExpressions: (NSArray *)leftExprs
+              rightExpressions: (NSArray *)rightExprs
+                      modifier: (NSComparisonPredicateModifier)modif
+                     operators: (NSArray *)ops
+                       options: (NSUInteger)opts;
+{
+  return self;
+}
+
+- (NSArray *) leftExpressions
+{
+  return nil;
+}
+
+- (double) matchForPredicate: (NSPredicate *)pred
+{
+  return 0.0;
+}
+
+- (NSComparisonPredicateModifier) modifier
+{
+  return NSDirectPredicateModifier;
+}
+
+- (NSArray *) operators
+{
+  return nil;
+}
+
+- (NSUInteger) options
+{
+  return 0;
+}
+
+- (NSPredicate *) predicateWithSubpredicates: (NSArray *)subpred
+{
+  return nil;
+}
+
+- (NSAttributeType) rightExpressionAttributeType
+{
+  return 0;
+}
+
+- (NSArray *) rightExpressions
+{
+  return nil;
+}
+
+- (void) setPredicate: (NSPredicate *)pred
+{
+}
+
+- (NSArray *) templateViews
+{
+  return nil;
+}
+
+@end