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executable file 268 lines (225 sloc) 5.688 kB
//
// CDataScanner.m
// TouchCode
//
// Created by Jonathan Wight on 04/16/08.
// Copyright 2008 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.h"
#import "CDataScanner_Extensions.h"
@interface CDataScanner ()
@property (readwrite, nonatomic, retain) NSCharacterSet *doubleCharacters;
@end
#pragma mark -
inline static unichar CharacterAtPointer(void *start, void *end)
{
#pragma unused(end)
const u_int8_t theByte = *(u_int8_t *)start;
if (theByte & 0x80)
{
// TODO -- UNICODE!!!! (well in theory nothing todo here)
}
const unichar theCharacter = theByte;
return(theCharacter);
}
@implementation CDataScanner
@synthesize doubleCharacters;
+ (id)scannerWithData:(NSData *)inData
{
CDataScanner *theScanner = [[[self alloc] init] autorelease];
theScanner.data = inData;
return(theScanner);
}
- (id)init
{
if ((self = [super init]) != nil)
{
self.doubleCharacters = [NSCharacterSet characterSetWithCharactersInString:@"0123456789eE-."];
}
return(self);
}
- (void)dealloc
{
self.data = NULL;
self.doubleCharacters = NULL;
//
[super dealloc];
}
- (NSUInteger)scanLocation
{
return(current - start);
}
- (NSData *)data
{
return(data);
}
- (void)setData:(NSData *)inData
{
if (data != inData)
{
if (data)
{
[data release];
data = NULL;
}
if (inData)
{
data = [inData retain];
//
start = (u_int8_t *)data.bytes;
end = start + data.length;
current = start;
length = data.length;
}
}
}
- (void)setScanLocation:(NSUInteger)inScanLocation
{
current = start + inScanLocation;
}
- (BOOL)isAtEnd
{
return(self.scanLocation >= length);
}
- (unichar)currentCharacter
{
return(CharacterAtPointer(current, end));
}
#pragma mark -
- (unichar)scanCharacter
{
const unichar theCharacter = CharacterAtPointer(current++, end);
return(theCharacter);
}
- (BOOL)scanCharacter:(unichar)inCharacter
{
unichar theCharacter = CharacterAtPointer(current, end);
if (theCharacter == inCharacter)
{
++current;
return(YES);
}
else
return(NO);
}
- (BOOL)scanUTF8String:(const char *)inString intoString:(NSString **)outValue;
{
const size_t theLength = strlen(inString);
if ((size_t)(end - current) < theLength)
return(NO);
if (strncmp((char *)current, inString, theLength) == 0)
{
current += theLength;
if (outValue)
*outValue = [NSString stringWithUTF8String:inString];
return(YES);
}
return(NO);
}
- (BOOL)scanString:(NSString *)inString intoString:(NSString **)outValue
{
if ((size_t)(end - current) < inString.length)
return(NO);
if (strncmp((char *)current, [inString UTF8String], inString.length) == 0)
{
current += inString.length;
if (outValue)
*outValue = inString;
return(YES);
}
return(NO);
}
- (BOOL)scanCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue
{
u_int8_t *P;
for (P = current; P < end && [inSet characterIsMember:*P] == YES; ++P)
;
if (P == current)
{
return(NO);
}
if (outValue)
{
*outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease];
}
current = P;
return(YES);
}
- (BOOL)scanUpToString:(NSString *)inString intoString:(NSString **)outValue
{
const char *theToken = [inString UTF8String];
const char *theResult = strnstr((char *)current, theToken, end - current);
if (theResult == NULL)
{
return(NO);
}
if (outValue)
{
*outValue = [[[NSString alloc] initWithBytes:current length:theResult - (char *)current encoding:NSUTF8StringEncoding] autorelease];
}
current = (u_int8_t *)theResult;
return(YES);
}
- (BOOL)scanUpToCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue
{
u_int8_t *P;
for (P = current; P < end && [inSet characterIsMember:*P] == NO; ++P)
;
if (P == current)
{
return(NO);
}
if (outValue)
{
*outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease];
}
current = P;
return(YES);
}
- (BOOL)scanNumber:(NSNumber **)outValue
{
// Replace all of this with a strtod call
NSString *theString = NULL;
if ([self scanCharactersFromSet:doubleCharacters intoString:&theString])
{
if (outValue)
*outValue = [NSNumber numberWithDouble:[theString doubleValue]]; // TODO dont use doubleValue
return(YES);
}
return(NO);
}
- (void)skipWhitespace
{
u_int8_t *P;
for (P = current; P < end && (isspace(*P)); ++P)
;
current = P;
}
- (NSString *)remainingString
{
NSData *theRemainingData = [NSData dataWithBytes:current length:end - current];
NSString *theString = [[[NSString alloc] initWithData:theRemainingData encoding:NSUTF8StringEncoding] autorelease];
return(theString);
}
@end
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