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executable file 127 lines (103 sloc) 3.442 kB
//
// NSScanner+MiscMerge.m
// Written by Don Yacktman and Carl Lindberg
// Copyright 2002-2004 by Don Yacktman and Carl Lindberg.
// All rights reserved.
// This notice may not be removed from this source code.
//
// This header is included in the MiscKit by permission from the author
// and its use is governed by the MiscKit license, found in the file
// "License.rtf" in the MiscKit distribution. Please refer to that file
// for a list of all applicable permissions and restrictions.
//
#import "NSScanner+MiscMerge.h"
#import <Foundation/NSCharacterSet.h>
#import "NSString+MiscAdditions.h"
#import <stdlib.h> // NULL on OSX
@implementation NSScanner (MiscMerge)
- (BOOL)scanLetterIntoString:(NSString **)aString
{
NSRange letterRange;
if ([self isAtEnd]) return NO;
// [self skipPastSkipCharacters];
letterRange = [[self string] rangeOfComposedCharacterSequenceAtIndex:[self scanLocation]];
if (letterRange.length == 0)
{
return NO;
}
else
{
[self setScanLocation:NSMaxRange(letterRange)];
if (aString) *aString = [[self string] substringWithRange:letterRange];
return YES;
}
}
- (BOOL)scanString:(NSString *)aString
{
return [self scanString:aString intoString:NULL];
}
/*"
* Returns the range of the string being scanned from the current
* scanLocation to the end. This method does not skip past the skip
* characters first.
"*/
- (NSRange)remainingRange
{
NSUInteger location = [self scanLocation];
return NSMakeRange(location, [[self string] length] - location);
}
/*"
* This method does the same thing as NeXT's private -skipCharacters method
* does -- skip past any charactersToBeSkipped at the current scan location
* and update the scanLocation accordingly. This is not a general use
* method; it is meant to be used by other NSScanner methods to skip past
* skip characters before doing other work the way other NSScanner methods
* do.
"*/
- (void)skipPastSkipCharacters
{
NSCharacterSet *nonskipSet = [[self charactersToBeSkipped] invertedSet];
NSRange skipRange;
if (nonskipSet == nil) return;
skipRange = [[self string] rangeOfCharacterFromSet:nonskipSet options:0
range:[self remainingRange]];
if (skipRange.length > 0)
{
[self setScanLocation:skipRange.location];
}
else
{
[self setScanLocation:[[self string] length]];
}
}
- (BOOL)scanCharacter:(unichar)targetCharacter
{
NSUInteger scanLocation = [self scanLocation];
NSString *myString = [self string];
[self skipPastSkipCharacters];
scanLocation = [self scanLocation];
myString = [self string];
if ([myString length] == scanLocation) return NO;
if ([myString characterAtIndex:scanLocation] == targetCharacter)
{
[self setScanLocation:scanLocation+1];
return YES;
}
return NO;
}
- (unichar)peekNextCharacter
{
NSUInteger scanLocation;
NSString *myString;
[self skipPastSkipCharacters];
scanLocation = [self scanLocation];
myString = [self string];
if ([myString length] == scanLocation) return 0;
return [myString characterAtIndex:scanLocation];
}
// NeXT has a method called this, at least in 3.3...
- (NSString *)remainingString
{
return [[self string] substringFromIndex:[self scanLocation]];
}
@end
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