mods/atsocial_iphone_app/TouchJSON/CDataScanner.m

   1 //
   2 //  CDataScanner.m
   3 //  TouchJSON
   4 //
   5 //  Created by Jonathan Wight on 04/16/08.
   6 //  Copyright 2008 toxicsoftware.com. All rights reserved.
   7 //
   8
   9 #import "CDataScanner.h"
  10
  11 #import "CDataScanner_Extensions.h"
  12
  13 @interface CDataScanner ()
  14 @property (readwrite, retain) NSCharacterSet *doubleCharacters;
  15 @end
  16
  17 #pragma mark -
  18
  19 inline static unichar CharacterAtPointer(void *start, void *end)
  20 {
  21
  22         const u_int8_t theByte = *(u_int8_t *)start;
  23 if (theByte & 0x80)
  24         {
  25         // TODO -- UNICODE!!!!
  26         }
  27 const unichar theCharacter = theByte;
  28 return(theCharacter);
  29 }
  30
  31 @implementation CDataScanner
  32
  33 @dynamic data;
  34 @dynamic scanLocation;
  35 @dynamic isAtEnd;
  36 @synthesize doubleCharacters;
  37
  38 + (id)scannerWithData:(NSData *)inData
  39 {
  40 CDataScanner *theScanner = [[[self alloc] init] autorelease];
  41 theScanner.data = inData;
  42 return(theScanner);
  43 }
  44
  45 - (id)init
  46 {
  47 if ((self = [super init]) != nil)
  48         {
  49         self.doubleCharacters = [NSCharacterSet characterSetWithCharactersInString:@"0123456789eE-."];
  50         }
  51 return(self);
  52 }
  53
  54 - (void)dealloc
  55 {
  56 self.data = NULL;
  57 self.doubleCharacters = NULL;
  58 //
  59 [super dealloc];
  60 }
  61
  62 - (NSInteger)scanLocation
  63 {
  64 return current - start;
  65 }
  66
  67 - (NSData *)data
  68 {
  69 return(data);
  70 }
  71
  72 - (void)setData:(NSData *)inData
  73 {
  74 if (data != inData)
  75         {
  76         if (data)
  77                 {
  78                 [data autorelease];
  79                 data = NULL;
  80                 }
  81
  82         if (inData)
  83                 {
  84                 data = [inData retain];
  85                 //
  86                 start = (u_int8_t *)data.bytes;
  87                 end = start + data.length;
  88                 current = start;
  89                 length = data.length;
  90                 }
  91     }
  92 }
  93
  94 - (void)setScanLocation:(NSInteger)inScanLocation
  95 {
  96 current = start + inScanLocation;
  97 }
  98
  99 - (BOOL)isAtEnd
 100 {
 101 return(self.scanLocation >= length);
 102 }
 103
 104 - (unichar)currentCharacter
 105 {
 106 return(CharacterAtPointer(current, end));
 107 }
 108
 109 - (unichar)scanCharacter
 110 {
 111 const unichar theCharacter = CharacterAtPointer(current++, end);
 112 return(theCharacter);
 113 }
 114
 115 - (BOOL)scanCharacter:(unichar)inCharacter
 116 {
 117 unichar theCharacter = CharacterAtPointer(current, end);
 118 if (theCharacter == inCharacter)
 119         {
 120         ++current;
 121         return(YES);
 122         }
 123 else
 124         return(NO);
 125 }
 126
 127 - (BOOL)scanUTF8String:(const char *)inString intoString:(NSString **)outValue;
 128 {
 129 const size_t theLength = strlen(inString);
 130 if (end - current < theLength)
 131         return(NO);
 132 if (strncmp((char *)current, inString, theLength) == 0)
 133         {
 134         current += theLength;
 135         if (outValue)
 136                 *outValue = [NSString stringWithUTF8String:inString];
 137         return(YES);
 138         }
 139 return(NO);
 140 }
 141
 142 - (BOOL)scanString:(NSString *)inString intoString:(NSString **)outValue
 143 {
 144 if (end - current < inString.length)
 145         return(NO);
 146 if (strncmp((char *)current, [inString UTF8String], inString.length) == 0)
 147         {
 148         current += inString.length;
 149         if (outValue)
 150                 *outValue = inString;
 151         return(YES);
 152         }
 153 return(NO);
 154 }
 155
 156 - (BOOL)scanCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue
 157 {
 158 u_int8_t *P;
 159 for (P = current; P < end && [inSet characterIsMember:*P] == YES; ++P)
 160         ;
 161
 162 if (P == current)
 163         {
 164         return(NO);
 165         }
 166
 167 if (outValue)
 168         {
 169         *outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease];
 170         }
 171
 172 current = P;
 173
 174 return(YES);
 175 }
 176
 177 - (BOOL)scanUpToString:(NSString *)inString intoString:(NSString **)outValue
 178 {
 179 const char *theToken = [inString UTF8String];
 180 const char *theResult = strnstr((char *)current, theToken, end - current);
 181 if (theResult == NULL)
 182         {
 183         return(NO);
 184         }
 185
 186 if (outValue)
 187         {
 188         *outValue = [[[NSString alloc] initWithBytes:current length:theResult - (char *)current encoding:NSUTF8StringEncoding] autorelease];
 189         }
 190
 191 current = (u_int8_t *)theResult;
 192
 193 return(YES);
 194 }
 195
 196 - (BOOL)scanUpToCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue
 197 {
 198 u_int8_t *P;
 199 for (P = current; P < end && [inSet characterIsMember:*P] == NO; ++P)
 200         ;
 201
 202 if (P == current)
 203         {
 204         return(NO);
 205         }
 206
 207 if (outValue)
 208         {
 209         *outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease];
 210         }
 211
 212 current = P;
 213
 214 return(YES);
 215 }
 216
 217 - (BOOL)scanNumber:(NSNumber **)outValue
 218 {
 219 // Replace all of this with a strtod call
 220 NSString *theString = NULL;
 221 if ([self scanCharactersFromSet:doubleCharacters intoString:&theString])
 222         {
 223         if (outValue)
 224                 *outValue = [NSNumber numberWithDouble:[theString doubleValue]]; // TODO dont use doubleValue
 225         return(YES);
 226         }
 227 return(NO);
 228 }
 229
 230 @end