source: trunk/ICeCoffEE/ICeCoffEE/ICeCoffEEScanner.m @ 88

//
//  ICeCoffEEScanner.m
//  ICeCoffEE
//
//  Created by Nicholas Riley on Fri Feb 08 2002.
//  Copyright (c) 2002 Nicholas Riley. All rights reserved.
//

#import "ICeCoffEEScanner.h"


@implementation ICeCoffEEScanner

- (id)initWithSource:(NSString *)aSource destination:(NSMutableString *)aDest;
{
    if ( (self = [super init]) != nil) {
        source = [aSource retain];
        length = [source length];
        dest = [aDest retain];
    }
    return self;
}

- (void)dealloc;
{
    [source release];
    [dest release];
    [super dealloc];
}

- (NSRange)_nextMatchRangeForString:(NSString *)string;
{
    return [source rangeOfString: string options: NSLiteralSearch range: NSMakeRange(loc, length - loc)];
}

- (void)_breakWithString:(NSString *)breakString atWidth:(unsigned)width forChars:(unsigned)charsToCopy;
{
    while (charsToCopy > width) {
        [dest appendString: [source substringWithRange: NSMakeRange(loc, width)]];
        charsToCopy -= width;
        loc += width;
        [dest appendString: breakString];
    }
}

- (void)breakWithString:(NSString *)breakString atWidth:(unsigned)width;
{
    NSRange matchRange = {1, 1};

    while ( (matchRange = [self _nextMatchRangeForString: breakString]).location != NSNotFound) {
        [self _breakWithString: breakString atWidth: width forChars: matchRange.location - loc];
        [dest appendString: [source substringWithRange: NSMakeRange(loc, matchRange.location + matchRange.length - loc)]];
        loc = matchRange.location + matchRange.length;
    }

    if (![self isAtEnd]) {
        [self _breakWithString: breakString atWidth: width forChars: [self remainingLength]];
        [self appendUpToEnd];
        [dest appendString: breakString];
    }

}

- (BOOL)appendUpToString:(NSString *)string;
{
    NSRange matchRange = [self _nextMatchRangeForString: string];

    if (matchRange.location == NSNotFound) return NO;

    [dest appendString: [source substringWithRange: NSMakeRange(loc, matchRange.location - loc)]];

    loc = matchRange.location + matchRange.length;

    return YES;
}

- (void)appendUpToEnd;
{
    [dest appendString: [source substringFromIndex: loc]];
    loc = length;
}

- (BOOL)isAtEnd;
{
    return (loc >= length);
}

- (unsigned)scanLocation;
{
    return loc;
}

- (unsigned)remainingLength;
{
    return (length - loc);
}

@end