From d854a633d1fe573692baa8d6a2f460e1fb167f1c Mon Sep 17 00:00:00 2001
From: Johan Paulsson <gonz@users.sourceforge.net>
Date: Sun, 27 Jan 2013 17:12:47 +0000
Subject: NSFormatter subclass for validating user input of tikz code

---
 tikzit/src/osx/TikzFormatter.h | 29 +++++++++++++
 tikzit/src/osx/TikzFormatter.m | 92 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 tikzit/src/osx/TikzFormatter.h
 create mode 100644 tikzit/src/osx/TikzFormatter.m

diff --git a/tikzit/src/osx/TikzFormatter.h b/tikzit/src/osx/TikzFormatter.h
new file mode 100644
index 0000000..4d9ec04
--- /dev/null
+++ b/tikzit/src/osx/TikzFormatter.h
@@ -0,0 +1,29 @@
+//
+//  NSTikzFormatter.h
+//  TikZiT
+//
+//  Created by Karl Johan Paulsson on 27/01/2013.
+//  Copyright (c) 2013 Aleks Kissinger. All rights reserved.
+//
+//
+//  This file is part of TikZiT.
+//
+//  TikZiT is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  TikZiT 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 General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with TikZiT.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface TikzFormatter : NSFormatter
+
+@end
diff --git a/tikzit/src/osx/TikzFormatter.m b/tikzit/src/osx/TikzFormatter.m
new file mode 100644
index 0000000..ecbb0bc
--- /dev/null
+++ b/tikzit/src/osx/TikzFormatter.m
@@ -0,0 +1,92 @@
+//
+//  NSTikzFormatter.m
+//  TikZiT
+//
+//  Created by Karl Johan Paulsson on 27/01/2013.
+//  Copyright (c) 2013 Aleks Kissinger. All rights reserved.
+//
+//
+//  This file is part of TikZiT.
+//
+//  TikZiT is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  TikZiT 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 General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with TikZiT.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#import "TikzFormatter.h"
+#import "TikzGraphAssembler.h"
+
+@implementation TikzFormatter
+
+- (NSString *)stringForObjectValue:(id)obj{    
+    if (![obj isKindOfClass:[NSString class]]) {
+        return @"";
+    }
+    
+    return [NSString stringWithString:obj];
+}
+
+- (BOOL)getObjectValue:(out id *)obj forString:(NSString *)string errorDescription:(out NSString **)error{    
+    *obj = [NSString stringWithString:string];
+    
+    TikzGraphAssembler *ass = [[TikzGraphAssembler alloc] init];
+	BOOL r = [ass testTikz:string];
+    
+    if (!r && error)
+        *error = NSLocalizedString(@"Invalid input, couldn't parse value.", @"tikz user input error");
+    
+    return r;
+}
+
+- (BOOL)isPartialStringValid:(NSString **)partialStringPtr proposedSelectedRange:(NSRangePointer)proposedSelRangePtr originalString:(NSString *)origString originalSelectedRange:(NSRange)origSelRange errorDescription:(NSString **)error{
+    NSRange addedRange;
+    NSString *addedString;
+    
+    addedRange = NSMakeRange(origSelRange.location, proposedSelRangePtr->location - origSelRange.location);
+    addedString = [*partialStringPtr substringWithRange: addedRange];
+    
+    if([addedString isEqualToString:@"{"]){
+        NSString *s = [[NSString stringWithString:*partialStringPtr] stringByAppendingString:@"}"];
+        *partialStringPtr = s;
+        
+        return NO;
+    }
+    
+    if([addedString isEqualToString:@"}"]){
+        NSScanner *scanner = [NSScanner scannerWithString:*partialStringPtr];
+        
+        NSCharacterSet *cs = [NSCharacterSet characterSetWithCharactersInString:@"{}"];
+        NSMutableString *strippedString = [NSMutableString stringWithCapacity:[*partialStringPtr length]];
+        
+        while ([scanner isAtEnd] == NO) {
+            NSString *buffer;
+            if ([scanner scanCharactersFromSet:cs intoString:&buffer]) {
+                [strippedString appendString:buffer];
+                
+            } else {
+                [scanner setScanLocation:([scanner scanLocation] + 1)];
+            }
+        }
+        
+        [cs autorelease];
+        [scanner autorelease];
+        [strippedString autorelease];
+        
+        if([strippedString length] % 2 == 1){
+            return NO;
+        }
+    }
+    
+    return YES;
+}
+
+@end
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