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184 lines (168 loc) · 4.96 KB
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// HTMLPreprocessedInputStream.m
//
// Public domain. https://github.com/nolanw/HTMLReader
#import"HTMLPreprocessedInputStream.h"
#import"HTMLString.h"
@implementationHTMLPreprocessedInputStream
{
NSUInteger _scanLocation;
CFStringInlineBuffer _buffer;
BOOL _reconsume;
UTF32Char _currentInputCharacter;
}
- (instancetype)initWithString:(NSString *)string
{
if ((self = [superinit])) {
_string = [string copy];
CFStringInitInlineBuffer((__bridge CFStringRef)_string, &_buffer, CFRangeMake(0, _string.length));
}
return self;
}
- (instancetype)init
{
return [selfinitWithString:@""];
}
- (BOOL)consumeString:(NSString *)stringmatchingCase:(BOOL)caseSensitive
{
NSScanner *scanner = [selfunprocessedScanner];
scanner.caseSensitive = caseSensitive;
BOOL ok = [scanner scanString:string intoString:nil];
if (ok) {
_scanLocation = scanner.scanLocation;
}
return ok;
}
- (NSString *)consumeCharactersUpToFirstPassingTest:(BOOL(^)(UTF32Char character))test
{
NSMutableString *consumed = [NSMutableStringnew];
for (;;) {
UTF32Char c = [selfconsumeNextInputCharacter];
if (c == (UTF32Char)EOF) break;
if (test(c)) {
[selfreconsumeCurrentInputCharacter];
break;
}
AppendLongCharacter(consumed, c);
}
if (consumed.length > 0) {
return consumed;
} else {
returnnil;
}
}
- (BOOL)consumeHexInt:(outunsignedint *)number
{
// NSScanner's -scanHexInt: allows for a leading "0x" or "0X", while the HTML spec does not.
NSCharacterSet *hexSet = [NSCharacterSetcharacterSetWithCharactersInString:@"0123456789ABCDEFabcdef"];
BOOL justHexDigits = [[selfunprocessedScanner] scanCharactersFromSet:hexSet intoString:nil];
if (!justHexDigits) returnNO;
NSScanner *scanner = [selfunprocessedScanner];
BOOL ok = [scanner scanHexInt:number];
if (ok) {
_scanLocation = scanner.scanLocation;
}
return ok;
}
- (BOOL)consumeUnsignedInt:(outunsignedint *)outNumber
{
NSScanner *scanner = [selfunprocessedScanner];
longlong number;
BOOL ok = [scanner scanLongLong:&number];
if (!ok || number < 0) returnNO;
_scanLocation = scanner.scanLocation;
if (outNumber) {
if (number > (longlong)UINT_MAX) {
*outNumber = UINT_MAX;
} else {
*outNumber = (unsignedint)number;
}
}
return ok;
}
- (NSScanner *)unprocessedScanner
{
NSScanner *scanner = [NSScannerscannerWithString:_string];
scanner.charactersToBeSkipped = nil;
scanner.scanLocation = _scanLocation;
return scanner;
}
- (UTF32Char)nextInputCharacter
{
return [selfnextInputCharacterAndConsume:NO];
}
- (UTF32Char)consumeNextInputCharacter
{
return [selfnextInputCharacterAndConsume:YES];
}
- (UTF32Char)nextInputCharacterAndConsume:(BOOL)consume
{
if (_reconsume) {
if (consume) {
_reconsume = NO;
}
return _currentInputCharacter;
}
NSUInteger advance = 0;
UTF32Char c = CFStringGetCharacterFromInlineBuffer(&_buffer, _scanLocation + advance);
if (c == 0 && _scanLocation + advance >= _string.length) {
c = EOF;
} else {
advance++;
}
if (CFStringIsSurrogateHighCharacter(c)) {
unichar low = CFStringGetCharacterFromInlineBuffer(&_buffer, _scanLocation + advance);
if (CFStringIsSurrogateLowCharacter(low)) {
advance++;
unichar high = c;
c = CFStringGetLongCharacterForSurrogatePair(high, low);
} else {
if (self.errorBlock) {
self.errorBlock(@"Isolated lead surrogate");
}
}
} elseif (CFStringIsSurrogateLowCharacter(c)) {
if (self.errorBlock) {
self.errorBlock(@"Isloated trail surrogate");
}
} elseif (c == '\r') {
c = '\n';
if (CFStringGetCharacterFromInlineBuffer(&_buffer, _scanLocation + advance) == '\n') {
advance++;
}
}
if (is_undefined_or_disallowed(c)) {
if (self.errorBlock) {
self.errorBlock(@"Noncharacter or disallowed control character");
}
}
if (consume) {
_scanLocation += advance;
_currentInputCharacter = c;
}
return c;
}
- (NSString *)nextUnprocessedCharactersWithMaximumLength:(NSUInteger)length
{
NSRange range = NSMakeRange(_scanLocation, length);
if (NSMaxRange(range) > _string.length) {
range.length = _string.length - range.location;
}
if (range.length > 0) {
return [_string substringWithRange:range];
} else {
returnnil;
}
}
- (void)reconsumeCurrentInputCharacter
{
_reconsume = YES;
}
- (void)unconsumeInputCharacters:(NSUInteger)numberOfCharactersToUnconsume
{
// TODO skip over ignored carriage returns
// TODO skip over surrogate second halves
// TODO bounds checking
// TODO consider reconsume
_scanLocation -= numberOfCharactersToUnconsume;
}
@end