/vendor/TouchJSON/Extensions/CDataScanner_Extensions.m

  1//
  2//  CDataScanner_Extensions.m
  3//  TouchCode
  4//
  5//  Created by Jonathan Wight on 12/08/2005.
  6//  Copyright 2005 toxicsoftware.com. All rights reserved.
  7//
  8//  Permission is hereby granted, free of charge, to any person
  9//  obtaining a copy of this software and associated documentation
 10//  files (the "Software"), to deal in the Software without
 11//  restriction, including without limitation the rights to use,
 12//  copy, modify, merge, publish, distribute, sublicense, and/or sell
 13//  copies of the Software, and to permit persons to whom the
 14//  Software is furnished to do so, subject to the following
 15//  conditions:
 16//
 17//  The above copyright notice and this permission notice shall be
 18//  included in all copies or substantial portions of the Software.
 19//
 20//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 21//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 22//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 23//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 24//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 25//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 26//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 27//  OTHER DEALINGS IN THE SOFTWARE.
 28//
 29
 30#import "CDataScanner_Extensions.h"
 31
 32#define LF 0x000a // Line Feed
 33#define FF 0x000c // Form Feed
 34#define CR 0x000d // Carriage Return
 35#define NEL 0x0085 // Next Line
 36#define LS 0x2028 // Line Separator
 37#define PS 0x2029 // Paragraph Separator
 38
 39@implementation CDataScanner (CDataScanner_Extensions)
 40
 41- (BOOL)scanCStyleComment:(NSString **)outComment
 42{
 43if ([self scanString:@"/*" intoString:NULL] == YES)
 44	{
 45	NSString *theComment = NULL;
 46	if ([self scanUpToString:@"*/" intoString:&theComment] == NO)
 47		[NSException raise:NSGenericException format:@"Started to scan a C style comment but it wasn't terminated."];
 48		
 49	if ([theComment rangeOfString:@"/*"].location != NSNotFound)
 50		[NSException raise:NSGenericException format:@"C style comments should not be nested."];
 51	
 52	if ([self scanString:@"*/" intoString:NULL] == NO)
 53		[NSException raise:NSGenericException format:@"C style comment did not end correctly."];
 54		
 55	if (outComment != NULL)
 56		*outComment = theComment;
 57
 58	return(YES);
 59	}
 60else
 61	{
 62	return(NO);
 63	}
 64}
 65
 66- (BOOL)scanCPlusPlusStyleComment:(NSString **)outComment
 67    {
 68    if ([self scanString:@"//" intoString:NULL] == YES)
 69        {
 70        unichar theCharacters[] = { LF, FF, CR, NEL, LS, PS, };
 71        NSCharacterSet *theLineBreaksCharacterSet = [NSCharacterSet characterSetWithCharactersInString:[NSString stringWithCharacters:theCharacters length:sizeof(theCharacters) / sizeof(*theCharacters)]];
 72
 73        NSString *theComment = NULL;
 74        [self scanUpToCharactersFromSet:theLineBreaksCharacterSet intoString:&theComment];
 75        [self scanCharactersFromSet:theLineBreaksCharacterSet intoString:NULL];
 76
 77        if (outComment != NULL)
 78            *outComment = theComment;
 79
 80        return(YES);
 81        }
 82    else
 83        {
 84        return(NO);
 85        }
 86    }
 87
 88- (NSUInteger)lineOfScanLocation
 89    {
 90    NSUInteger theLine = 0;
 91    for (const u_int8_t *C = start; C < current; ++C)
 92        {
 93        // TODO: JIW What about MS-DOS line endings you bastard! (Also other unicode line endings)
 94        if (*C == '\n' || *C == '\r')
 95            {
 96            ++theLine;
 97            }
 98        }
 99    return(theLine);
100    }
101
102- (NSDictionary *)userInfoForScanLocation
103    {
104    NSUInteger theLine = 0;
105    const u_int8_t *theLineStart = start;
106    for (const u_int8_t *C = start; C < current; ++C)
107        {
108        if (*C == '\n' || *C == '\r')
109            {
110            theLineStart = C - 1;
111            ++theLine;
112            }
113        }
114
115    NSUInteger theCharacter = current - theLineStart;
116
117    NSRange theStartRange = NSIntersectionRange((NSRange){ .location = MAX((NSInteger)self.scanLocation - 20, 0), .length = 20 + (NSInteger)self.scanLocation - 20 }, (NSRange){ .location = 0, .length = self.data.length });
118    NSRange theEndRange = NSIntersectionRange((NSRange){ .location = self.scanLocation, .length = 20 }, (NSRange){ .location = 0, .length = self.data.length });
119
120
121    NSString *theSnippet = [NSString stringWithFormat:@"%@!HERE>!%@",
122        [[[NSString alloc] initWithData:[self.data subdataWithRange:theStartRange] encoding:NSUTF8StringEncoding] autorelease],
123        [[[NSString alloc] initWithData:[self.data subdataWithRange:theEndRange] encoding:NSUTF8StringEncoding] autorelease]
124        ];
125
126    NSDictionary *theUserInfo = [NSDictionary dictionaryWithObjectsAndKeys:
127        [NSNumber numberWithUnsignedInteger:theLine], @"line",
128        [NSNumber numberWithUnsignedInteger:theCharacter], @"character",
129        [NSNumber numberWithUnsignedInteger:self.scanLocation], @"location",
130        theSnippet, @"snippet",
131        NULL];
132    return(theUserInfo);    
133    }
134
135@end