// HTMLString.m // // Public domain. https://github.com/nolanw/HTMLReader #import "HTMLString.h" void AppendLongCharacter(NSMutableString *self, UTF32Char character) { unichar surrogates[2]; Boolean two = CFStringGetSurrogatePairForLongCharacter(character, surrogates); CFStringAppendCharacters((__bridge CFMutableStringRef)self, surrogates, two ? 2 : 1); } void EnumerateLongCharacters(NSString *self, void (^block)(UTF32Char character)) { CFStringInlineBuffer buffer; CFIndex length = self.length; if (length == 0) return; CFStringInitInlineBuffer((__bridge CFStringRef)self, &buffer, CFRangeMake(0, length)); unichar highSurrogate = 0; for (CFIndex i = 0; i < length; i++) { unichar character = CFStringGetCharacterFromInlineBuffer(&buffer, i); if (highSurrogate) { if (CFStringIsSurrogateLowCharacter(character)) { block(CFStringGetLongCharacterForSurrogatePair(highSurrogate, character)); } else { block(highSurrogate); block(character); } highSurrogate = 0; } else if (CFStringIsSurrogateHighCharacter(character) && i < length - 1) { highSurrogate = character; } else { block(character); } } } NSString * StringWithLongCharacter(UTF32Char character) { unichar surrogates[2]; if (CFStringGetSurrogatePairForLongCharacter(character, surrogates)) { return [NSString stringWithFormat:@"%C%C", surrogates[0], surrogates[1]]; } else { return [NSString stringWithFormat:@"%C", surrogates[0]]; } } BOOL is_whitespace(UTF32Char c) { return c == '\t' || c == '\n' || c == '\f' || c == ' '; } BOOL is_undefined_or_disallowed(UTF32Char c) { return ((c >= 0x0001 && c <= 0x0008) || (c >= 0x000E && c <= 0x001F) || (c >= 0x007F && c <= 0x009F) || (c >= 0xFDD0 && c <= 0xFDEF) || c == 0x000B || c == 0xFFFE || c == 0xFFFF || c == 0x1FFFE || c == 0x1FFFF || c == 0x2FFFE || c == 0x2FFFF || c == 0x3FFFE || c == 0x3FFFF || c == 0x4FFFE || c == 0x4FFFF || c == 0x5FFFE || c == 0x5FFFF || c == 0x6FFFE || c == 0x6FFFF || c == 0x7FFFE || c == 0x7FFFF || c == 0x8FFFE || c == 0x8FFFF || c == 0x9FFFE || c == 0x9FFFF || c == 0xAFFFE || c == 0xAFFFF || c == 0xBFFFE || c == 0xBFFFF || c == 0xCFFFE || c == 0xCFFFF || c == 0xDFFFE || c == 0xDFFFF || c == 0xEFFFE || c == 0xEFFFF || c == 0xFFFFE || c == 0xFFFFF || c == 0x10FFFE || c == 0x10FFFF); }