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#import "ReadStream.h"
@implementation ReadStream
-(ReadStream *) initWithString: (NSString *) s {
[self init];
str = s;
pos = 0;
return self;
}
-(unichar) safeCharAtIndex: (int) i {
return [self isAtEnd] ? 0 : [str characterAtIndex: i];
}
-(unichar) peekBack {
return [self safeCharAtIndex: pos - 1];
}
-(unichar) peek {
return [self safeCharAtIndex: pos];
}
-(unichar) peekTwo {
return [self safeCharAtIndex: pos + 1];
}
-(unichar) read {
unichar c = [self safeCharAtIndex: pos];
pos++;
return c;
}
-(BOOL) isAtEnd {
return pos == [str length];
}
-(unichar) expect: (unichar) c {
unichar r;
if((r = [self read]) != c) NSLog(@"WARNING: expected %c at position %d, found %c", c, pos - 1, r);
return r;
}
-(NSString *) readUpto: (unichar) c {
int found = pos;
while(found != [str length] && [self safeCharAtIndex: found++] != c);
//if(found == [str length]) return NULL; // not found
found--;
NSString *s = [str substringWithRange: NSMakeRange(pos, found - pos)];
pos = found;
return s;
}
/*-(NSString *) readUptoString: (NSString *) s {
NSRange range = [str rangeOfString: s options: 0 range: NSMakeRange(pos, [str length] - pos)];
NSString *text;
if(range.location != NSNotFound) {
text = [str substringToIndex: range.location];
pos = range.location;
} else {
text = [str substringFromIndex: pos];
}
return text;
}*/
@end
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