iska
129 lines
3.2 KiB
Objective-C
129 lines
3.2 KiB
Objective-C
//
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// CSSInputStream.m
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// HTMLKit
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//
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// Created by Iska on 07/06/15.
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// Copyright (c) 2015 BrainCookie. All rights reserved.
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//
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#import "CSSInputStream.h"
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#import "CSSCodePoints.h"
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@interface HTMLInputStreamReader ()
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- (void)emitParseError:(NSString *)reason;
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@end
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@implementation CSSInputStream
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- (void)consumeWhitespace
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{
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while (isWhitespace(self.nextInputCharacter)) {
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[self consumeNextInputCharacter];
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}
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}
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- (NSString *)consumeIdentifier
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{
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CFMutableStringRef value = CFStringCreateMutable(kCFAllocatorDefault, 0);
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if (!isValidIdentifierStart([self inputCharacterPointAtOffset:0],
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[self inputCharacterPointAtOffset:1],
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[self inputCharacterPointAtOffset:2])) {
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return nil;
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}
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while (YES) {
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UTF32Char codePoint = [self consumeNextInputCharacter];
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if (codePoint == EOF) {
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break;
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} else if (isName(codePoint)) {
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AppendCodePoint(value, codePoint);
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} else if (isValidEscape(codePoint, [self inputCharacterPointAtOffset:1])) {
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UTF32Char escapedCodePoint = [self consumeEscapedCodePoint];
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AppendCodePoint(value, escapedCodePoint);
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} else {
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[self reconsumeCurrentInputCharacter];
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break;
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}
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}
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return (__bridge NSString *)(CFStringGetLength(value) > 0 ? value : nil);
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}
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- (NSString *)consumeStringWithEndingCodePoint:(UTF32Char)endingCodePoint
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{
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CFMutableStringRef value = CFStringCreateMutable(kCFAllocatorDefault, 0);
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while (YES) {
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UTF32Char codePoint = [self consumeNextInputCharacter];
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if (codePoint == endingCodePoint) {
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break;
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}
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switch (codePoint) {
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case EOF:
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break;
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case LINE_FEED:
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[self emitParseError:@"New-line character (0x000A) in CSS attribute value"];
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[self reconsumeCurrentInputCharacter];
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break;
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case REVERSE_SOLIDUS:
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{
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UTF32Char next = self.nextInputCharacter;
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if (next == EOF) {
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continue;
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} else if (next == LINE_FEED) {
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[self consumeNextInputCharacter];
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} else {
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UTF32Char escapedCodePoint = [self consumeNextInputCharacter];
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AppendCodePoint(value, escapedCodePoint);
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}
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}
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default:
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AppendCodePoint(value, codePoint);
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break;
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}
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}
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return (__bridge NSString *)(CFStringGetLength(value) > 0 ? value : nil);
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}
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- (UTF32Char)consumeEscapedCodePoint
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{
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UTF32Char codePoint = [self consumeNextInputCharacter];
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if (isHexDigit(codePoint)) {
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CFMutableStringRef hexString = CFStringCreateMutable(kCFAllocatorDefault, 6);
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AppendCodePoint(hexString, codePoint);
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while (isHexDigit(self.nextInputCharacter) && CFStringGetLength(hexString) <= 6) {
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UniChar codePoint = [self consumeNextInputCharacter];
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CFStringAppendCharacters(hexString, &codePoint, 1);
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}
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if (isWhitespace(self.nextInputCharacter)) {
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[self consumeNextInputCharacter];
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}
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NSScanner *scanner = [NSScanner scannerWithString:(__bridge NSString *)(hexString)];
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UTF32Char number;
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[scanner scanHexInt:&number];
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return isValidEscapedCodePoint(number) ? number : REPLACEMENT_CHARACTER;
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} else if (codePoint == EOF) {
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return REPLACEMENT_CHARACTER;
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}
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return codePoint;
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}
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- (NSString *)consumeCombinator
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{
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NSString *combinator = [self consumeCharactersInString:@" >+~"];
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combinator = [combinator stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
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return combinator;
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}
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@end
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