1 files changed, 135 insertions, 0 deletions

@@ -0,0 +1,135 @@
+//
+//  CDataScanner_Extensions.m
+//  TouchCode
+//
+//  Created by Jonathan Wight on 12/08/2005.
+//  Copyright 2005 toxicsoftware.com. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#import "CDataScanner_Extensions.h"
+
+#define LF 0x000a // Line Feed
+#define FF 0x000c // Form Feed
+#define CR 0x000d // Carriage Return
+#define NEL 0x0085 // Next Line
+#define LS 0x2028 // Line Separator
+#define PS 0x2029 // Paragraph Separator
+
+@implementation CDataScanner (CDataScanner_Extensions)
+
+- (BOOL)scanCStyleComment:(NSString **)outComment
+{
+if ([self scanString:@"/*" intoString:NULL] == YES)
+        {
+        NSString *theComment = NULL;
+        if ([self scanUpToString:@"*/" intoString:&theComment] == NO)
+                [NSException raise:NSGenericException format:@"Started to scan a C style comment but it wasn't terminated."];
+                
+        if ([theComment rangeOfString:@"/*"].location != NSNotFound)
+                [NSException raise:NSGenericException format:@"C style comments should not be nested."];
+        
+        if ([self scanString:@"*/" intoString:NULL] == NO)
+                [NSException raise:NSGenericException format:@"C style comment did not end correctly."];
+                
+        if (outComment != NULL)
+                *outComment = theComment;
+
+        return(YES);
+        }
+else
+        {
+        return(NO);
+        }
+}
+
+- (BOOL)scanCPlusPlusStyleComment:(NSString **)outComment
+    {
+    if ([self scanString:@"//" intoString:NULL] == YES)
+        {
+        unichar theCharacters[] = { LF, FF, CR, NEL, LS, PS, };
+        NSCharacterSet *theLineBreaksCharacterSet = [NSCharacterSet characterSetWithCharactersInString:[NSString stringWithCharacters:theCharacters length:sizeof(theCharacters) / sizeof(*theCharacters)]];
+
+        NSString *theComment = NULL;
+        [self scanUpToCharactersFromSet:theLineBreaksCharacterSet intoString:&theComment];
+        [self scanCharactersFromSet:theLineBreaksCharacterSet intoString:NULL];
+
+        if (outComment != NULL)
+            *outComment = theComment;
+
+        return(YES);
+        }
+    else
+        {
+        return(NO);
+        }
+    }
+
+- (NSUInteger)lineOfScanLocation
+    {
+    NSUInteger theLine = 0;
+    for (const u_int8_t *C = start; C < current; ++C)
+        {
+        // TODO: JIW What about MS-DOS line endings you bastard! (Also other unicode line endings)
+        if (*C == '\n' || *C == '\r')
+            {
+            ++theLine;
+            }
+        }
+    return(theLine);
+    }
+
+- (NSDictionary *)userInfoForScanLocation
+    {
+    NSUInteger theLine = 0;
+    const u_int8_t *theLineStart = start;
+    for (const u_int8_t *C = start; C < current; ++C)
+        {
+        if (*C == '\n' || *C == '\r')
+            {
+            theLineStart = C - 1;
+            ++theLine;
+            }
+        }
+
+    NSUInteger theCharacter = current - theLineStart;
+
+    NSRange theStartRange = NSIntersectionRange((NSRange){ .location = MAX((NSInteger)self.scanLocation - 20, 0), .length = 20 + (NSInteger)self.scanLocation - 20 }, (NSRange){ .location = 0, .length = self.data.length });
+    NSRange theEndRange = NSIntersectionRange((NSRange){ .location = self.scanLocation, .length = 20 }, (NSRange){ .location = 0, .length = self.data.length });
+
+
+    NSString *theSnippet = [NSString stringWithFormat:@"%@!HERE>!%@",
+        [[[NSString alloc] initWithData:[self.data subdataWithRange:theStartRange] encoding:NSUTF8StringEncoding] autorelease],
+        [[[NSString alloc] initWithData:[self.data subdataWithRange:theEndRange] encoding:NSUTF8StringEncoding] autorelease]
+        ];
+
+    NSDictionary *theUserInfo = [NSDictionary dictionaryWithObjectsAndKeys:
+        [NSNumber numberWithUnsignedInteger:theLine], @"line",
+        [NSNumber numberWithUnsignedInteger:theCharacter], @"character",
+        [NSNumber numberWithUnsignedInteger:self.scanLocation], @"location",
+        theSnippet, @"snippet",
+        NULL];
+    return(theUserInfo);    
+    }
+
+@end