mirror of
https://github.com/Novaloop-AG/element-x-ios.git
synced 2026-11-02 21:33:26 +00:00
Initial timeline HTML support.
This commit is contained in:
Stefan Ceriu
@@ -0,0 +1,85 @@
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//
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// AttributedStringBuilder.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 22/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import DTCoreText
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struct AttributedStringBuilder: AttributedStringBuilderProtocol {
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private var defaultCSS: String {
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AttributedStringBuilderUtils.cssToMarkBlockquotes() +
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"""
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pre,code {
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background-color: #F5F7FA;
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display: inline;
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font-family: monospace;
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white-space: pre;
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-coretext-fontname: Menlo-Regular;
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}
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h1,h2,h3 {
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font-size: 1.2em;
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}
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"""
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}
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// Do not use the default HTML renderer of NSAttributedString because this method
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// runs on the UI thread which we want to avoid because renderHTMLString is called
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// most of the time from a background thread.
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// Use DTCoreText HTML renderer instead.
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// Using DTCoreText, which renders static string, helps to avoid code injection attacks
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// that could happen with the default HTML renderer of NSAttributedString which is a
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// webview.
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func fromHTML(_ htmlString: String?) -> AttributedString? {
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guard let htmlString = htmlString,
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let data = htmlString.data(using: .utf8) else {
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return nil
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}
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let defaultFont = UIFont.preferredFont(forTextStyle: .body)
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let defaultColor = UIColor.black
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let parsingOptions: [String: Any] = [
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DTUseiOS6Attributes: true,
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DTDefaultFontFamily: defaultFont.familyName,
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DTDefaultFontName: defaultFont.fontName,
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DTDefaultFontSize: defaultFont.pointSize,
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DTDefaultTextColor: defaultColor,
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DTDefaultLinkDecoration: false,
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DTDefaultStyleSheet: DTCSSStylesheet(styleBlock: self.defaultCSS) as Any
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]
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guard let builder = DTHTMLAttributedStringBuilder(html: data, options: parsingOptions, documentAttributes: nil) else {
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return nil
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}
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builder.willFlushCallback = { element in
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element?.sanitize(font: defaultFont)
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}
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guard var nsAttributedString = builder.generatedAttributedString() else {
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return nil
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}
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nsAttributedString = AttributedStringBuilderUtils.removeDTCoreTextArtifacts(nsAttributedString)
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nsAttributedString = AttributedStringBuilderUtils.removeMarkedBlockquotesArtifacts(nsAttributedString)
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return try? AttributedString(nsAttributedString, including: \.elementX)
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}
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func blockquoteCoalescedComponentsFrom(_ attributedString: AttributedString?) -> [AttributedStringBuilderComponent]? {
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guard let attributedString = attributedString else {
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return nil
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}
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return attributedString.runs[\.blockquote].map { (value, range) in
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AttributedStringBuilderComponent(attributedString: AttributedString(attributedString[range]),
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isBlockquote: value != nil)
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}
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}
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}
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@@ -0,0 +1,20 @@
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//
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// AttributedStringBuilderProtocol.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 24/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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struct AttributedStringBuilderComponent: Hashable {
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let attributedString: AttributedString
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let isBlockquote: Bool
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}
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protocol AttributedStringBuilderProtocol {
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func fromHTML(_ htmlString: String?) -> AttributedString?
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func blockquoteCoalescedComponentsFrom(_ attributedString: AttributedString?) -> [AttributedStringBuilderComponent]?
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}
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@@ -0,0 +1,27 @@
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//
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// AttributedStringBuilderUtils.h
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// ElementX
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//
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// Created by Stefan Ceriu on 23/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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FOUNDATION_EXPORT NSString *const kMXKToolsBlockquoteMarkAttribute;
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@interface AttributedStringBuilderUtils : NSObject
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+ (NSAttributedString *)removeDTCoreTextArtifacts:(NSAttributedString *)attributedString;
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+ (NSAttributedString*)removeMarkedBlockquotesArtifacts:(NSAttributedString*)attributedString;
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+ (NSString*)cssToMarkBlockquotes;
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+ (void)enumerateMarkedBlockquotesInAttributedString:(NSAttributedString*)attributedString usingBlock:(void (^)(NSRange range, BOOL *stop))block;
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@end
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NS_ASSUME_NONNULL_END
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@@ -0,0 +1,200 @@
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//
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// AttributedStringBuilderUtils.m
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// ElementX
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//
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// Created by Stefan Ceriu on 23/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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#import "AttributedStringBuilderUtils.h"
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@import DTCoreText;
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// Temporary background color used to identify blockquote blocks with DTCoreText.
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#define kMXKToolsBlockquoteMarkColor [UIColor magentaColor]
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// Attribute in an NSAttributeString that marks a blockquote block that was in the original HTML string.
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NSString *const kMXKToolsBlockquoteMarkAttribute = @"kMXKToolsBlockquoteMarkAttribute";
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@implementation AttributedStringBuilderUtils
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+ (NSAttributedString *)removeDTCoreTextArtifacts:(NSAttributedString *)attributedString
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{
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NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
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// DTCoreText adds a newline at the end of plain text ( https://github.com/Cocoanetics/DTCoreText/issues/779 )
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// or after a blockquote section.
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// Trim trailing whitespace and newlines in the string content
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while ([mutableAttributedString.string hasSuffixCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]])
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{
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[mutableAttributedString deleteCharactersInRange:NSMakeRange(mutableAttributedString.length - 1, 1)];
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}
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// New lines may have also been introduced by the paragraph style
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// Make sure the last paragraph style has no spacing
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[mutableAttributedString enumerateAttributesInRange:NSMakeRange(0, mutableAttributedString.length) options:(NSAttributedStringEnumerationReverse) usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
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if (attrs[NSParagraphStyleAttributeName])
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{
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NSString *subString = [mutableAttributedString.string substringWithRange:range];
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NSArray *components = [subString componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
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NSMutableDictionary *updatedAttrs = [NSMutableDictionary dictionaryWithDictionary:attrs];
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NSMutableParagraphStyle *paragraphStyle = [updatedAttrs[NSParagraphStyleAttributeName] mutableCopy];
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paragraphStyle.paragraphSpacing = 0;
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updatedAttrs[NSParagraphStyleAttributeName] = paragraphStyle;
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if (components.count > 1)
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{
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NSString *lastComponent = components.lastObject;
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NSRange range2 = NSMakeRange(range.location, range.length - lastComponent.length);
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[mutableAttributedString setAttributes:attrs range:range2];
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range2 = NSMakeRange(range2.location + range2.length, lastComponent.length);
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[mutableAttributedString setAttributes:updatedAttrs range:range2];
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}
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else
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{
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[mutableAttributedString setAttributes:updatedAttrs range:range];
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}
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}
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// Check only the last paragraph
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*stop = YES;
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}];
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// Image rendering failed on an exception until we replace the DTImageTextAttachments with a simple NSTextAttachment subclass
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// (thanks to https://github.com/Cocoanetics/DTCoreText/issues/863).
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[mutableAttributedString enumerateAttribute:NSAttachmentAttributeName
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inRange:NSMakeRange(0, mutableAttributedString.length)
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options:0
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usingBlock:^(id value, NSRange range, BOOL *stop) {
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if ([value isKindOfClass:DTImageTextAttachment.class])
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{
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DTImageTextAttachment *attachment = (DTImageTextAttachment*)value;
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NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
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if (attachment.image)
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{
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textAttachment.image = attachment.image;
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CGRect frame = textAttachment.bounds;
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frame.size = attachment.displaySize;
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textAttachment.bounds = frame;
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}
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// Note we remove here attachment without image.
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NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
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[mutableAttributedString replaceCharactersInRange:range withAttributedString:attrStringWithImage];
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}
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}];
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return mutableAttributedString;
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}
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+ (NSString*)cssToMarkBlockquotes
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{
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return [NSString stringWithFormat:@"blockquote {background: #%lX; display: block;}", (unsigned long)[[self class] rgbValueWithColor:kMXKToolsBlockquoteMarkColor]];
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}
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+ (NSAttributedString*)removeMarkedBlockquotesArtifacts:(NSAttributedString*)attributedString
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{
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NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
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// Enumerate all sections marked thanks to `cssToMarkBlockquotes`
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// and apply our own attribute instead.
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// According to blockquotes in the string, DTCoreText can apply 2 policies:
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// - define a `DTTextBlocksAttribute` attribute on a <blockquote> block
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// - or, just define a `NSBackgroundColorAttributeName` attribute
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// `DTTextBlocksAttribute` case
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[attributedString enumerateAttribute:DTTextBlocksAttribute
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inRange:NSMakeRange(0, attributedString.length)
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options:0
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usingBlock:^(id _Nullable value, NSRange range, BOOL * _Nonnull stop)
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{
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if ([value isKindOfClass:NSArray.class])
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{
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NSArray *array = (NSArray*)value;
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if (array.count > 0 && [array[0] isKindOfClass:DTTextBlock.class])
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{
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DTTextBlock *dtTextBlock = (DTTextBlock *)array[0];
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if ([dtTextBlock.backgroundColor isEqual:kMXKToolsBlockquoteMarkColor])
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{
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// Apply our own attribute
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[mutableAttributedString addAttribute:kMXKToolsBlockquoteMarkAttribute value:@(YES) range:range];
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// Fix a boring behaviour where DTCoreText add a " " string before a string corresponding
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// to an HTML blockquote. This " " string has ParagraphStyle.headIndent = 0 which breaks
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// the blockquote block indentation
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if (range.location > 0)
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{
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NSRange prevRange = NSMakeRange(range.location - 1, 1);
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NSRange effectiveRange;
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NSParagraphStyle *paragraphStyle = [attributedString attribute:NSParagraphStyleAttributeName
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atIndex:prevRange.location
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effectiveRange:&effectiveRange];
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// Check if this is the " " string
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if (paragraphStyle && effectiveRange.length == 1 && paragraphStyle.firstLineHeadIndent != 25)
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{
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// Fix its paragraph style
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NSMutableParagraphStyle *newParagraphStyle = [paragraphStyle mutableCopy];
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newParagraphStyle.firstLineHeadIndent = 25.0;
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newParagraphStyle.headIndent = 25.0;
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[mutableAttributedString addAttribute:NSParagraphStyleAttributeName value:newParagraphStyle range:prevRange];
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}
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}
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}
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}
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}
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}];
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// `NSBackgroundColorAttributeName` case
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[mutableAttributedString enumerateAttribute:NSBackgroundColorAttributeName
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inRange:NSMakeRange(0, mutableAttributedString.length)
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options:0
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usingBlock:^(id value, NSRange range, BOOL *stop)
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{
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if ([value isKindOfClass:UIColor.class] && [(UIColor*)value isEqual:kMXKToolsBlockquoteMarkColor])
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{
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// Remove the marked background
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[mutableAttributedString removeAttribute:NSBackgroundColorAttributeName range:range];
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// And apply our own attribute
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[mutableAttributedString addAttribute:kMXKToolsBlockquoteMarkAttribute value:@(YES) range:range];
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}
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}];
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return mutableAttributedString;
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}
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+ (NSUInteger)rgbValueWithColor:(UIColor*)color
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{
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CGFloat red, green, blue, alpha;
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[color getRed:&red green:&green blue:&blue alpha:&alpha];
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NSUInteger rgbValue = ((int)(red * 255) << 16) + ((int)(green * 255) << 8) + (blue * 255);
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return rgbValue;
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}
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+ (void)enumerateMarkedBlockquotesInAttributedString:(NSAttributedString*)attributedString usingBlock:(void (^)(NSRange range, BOOL *stop))block
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{
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[attributedString enumerateAttribute:kMXKToolsBlockquoteMarkAttribute
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inRange:NSMakeRange(0, attributedString.length)
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options:0
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usingBlock:^(id _Nullable value, NSRange range, BOOL * _Nonnull stop)
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{
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if ([value isKindOfClass:NSNumber.class] && ((NSNumber*)value).boolValue)
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{
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block(range, stop);
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}
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}];
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}
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@end
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@@ -0,0 +1,71 @@
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//
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// DTHTMLElement+AttributedStringBuilder.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 24/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import DTCoreText
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public extension DTHTMLElement {
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/// Sanitize the element using the given parameters.
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/// - Parameters:
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/// - allowedHTMLTags: An array of tags that are allowed. All other tags will be removed.
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/// - font: The default font to use when resetting the content of any unsupported tags.
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/// - imageHandler: An optional image handler to be run on `img` tags (if allowed) to update the `src` attribute.
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@objc func sanitize(font: UIFont) {
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if let name = name, !Self.allowedHTMLTags.contains(name) {
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// This is an unsupported tag.
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// Remove any attachments to fix rendering.
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textAttachment = nil
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// If the element has plain text content show that,
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// otherwise prevent the tag from displaying.
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if let stringContent = attributedString()?.string,
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!stringContent.isEmpty,
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let element = DTTextHTMLElement(name: nil, attributes: nil) {
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element.setText(stringContent)
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removeAllChildNodes()
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addChildNode(element)
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if let parent = parent() {
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element.inheritAttributes(from: parent)
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} else {
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fontDescriptor = DTCoreTextFontDescriptor()
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fontDescriptor.fontFamily = font.familyName
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fontDescriptor.fontName = font.fontName
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fontDescriptor.pointSize = font.pointSize
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paragraphStyle = DTCoreTextParagraphStyle.default()
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element.inheritAttributes(from: self)
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}
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element.interpretAttributes()
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} else if let parent = parent() {
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parent.removeChildNode(self)
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} else {
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didOutput = true
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}
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} else {
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// This element is a supported tag, but it may contain children that aren't,
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// so santize all child nodes to ensure correct tags.
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if let childNodes = childNodes as? [DTHTMLElement] {
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childNodes.forEach { $0.sanitize(font: font) }
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}
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}
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}
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private static var allowedHTMLTags = {
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["font", // custom to matrix for IRC-style font coloring
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"del", // for markdown
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"body", // added internally by DTCoreText
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"mx-reply",
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"h1", "h2", "h3", "h4", "h5", "h6", "blockquote", "p", "a", "ul", "ol",
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"nl", "li", "b", "i", "u", "strong", "em", "strike", "code", "hr", "br", "div",
|
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"table", "thead", "caption", "tbody", "tr", "th", "td", "pre"]
|
||||
}()
|
||||
}
|
||||
@@ -0,0 +1,31 @@
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//
|
||||
// ElementXAttributeScope.swift
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 23/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
import Foundation
|
||||
|
||||
enum BlockquoteAttribute: AttributedStringKey {
|
||||
typealias Value = Bool
|
||||
public static var name = kMXKToolsBlockquoteMarkAttribute
|
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}
|
||||
|
||||
extension AttributeScopes {
|
||||
struct ElementXAttributes: AttributeScope {
|
||||
let blockquote: BlockquoteAttribute
|
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|
||||
let swiftUI: SwiftUIAttributes
|
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let uiKit: UIKitAttributes
|
||||
}
|
||||
|
||||
var elementX: ElementXAttributes.Type { ElementXAttributes.self }
|
||||
}
|
||||
|
||||
extension AttributeDynamicLookup {
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||||
subscript<T: AttributedStringKey>(dynamicMember keyPath: KeyPath<AttributeScopes.ElementXAttributes, T>) -> T {
|
||||
return self[T.self]
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,19 @@
|
||||
//
|
||||
// UIFont+AttributedStringBuilder.h
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 23/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
@import UIKit;
|
||||
|
||||
NS_ASSUME_NONNULL_BEGIN
|
||||
|
||||
@interface UIFont(DTCoreTextFix)
|
||||
|
||||
// Fix DTCoreText iOS 13 issue (https://github.com/Cocoanetics/DTCoreText/issues/1168)
|
||||
|
||||
@end
|
||||
|
||||
NS_ASSUME_NONNULL_END
|
||||
@@ -0,0 +1,73 @@
|
||||
//
|
||||
// UIFont+AttributedStringBuilder.h
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 23/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
#import "UIFont+AttributedStringBuilder.h"
|
||||
|
||||
@import UIKit;
|
||||
@import CoreText;
|
||||
@import ObjectiveC;
|
||||
|
||||
#pragma mark - UIFont DTCoreText fix
|
||||
|
||||
@interface UIFont (vc_DTCoreTextFix)
|
||||
|
||||
+ (UIFont *)vc_fixedFontWithCTFont:(CTFontRef)ctFont;
|
||||
|
||||
@end
|
||||
|
||||
@implementation UIFont (vc_DTCoreTextFix)
|
||||
|
||||
+ (UIFont *)vc_fixedFontWithCTFont:(CTFontRef)ctFont {
|
||||
NSString *fontName = (__bridge_transfer NSString *)CTFontCopyName(ctFont, kCTFontPostScriptNameKey);
|
||||
|
||||
CGFloat fontSize = CTFontGetSize(ctFont);
|
||||
UIFont *font = [UIFont fontWithName:fontName size:fontSize];
|
||||
|
||||
// On iOS 13+ "TimesNewRomanPSMT" will be used instead of "SFUI"
|
||||
// In case of "Times New Roman" fallback, use system font and reuse UIFontDescriptorSymbolicTraits.
|
||||
if ([font.familyName.lowercaseString containsString:@"times"])
|
||||
{
|
||||
UIFontDescriptorSymbolicTraits symbolicTraits = (UIFontDescriptorSymbolicTraits)CTFontGetSymbolicTraits(ctFont);
|
||||
|
||||
UIFontDescriptor *systemFontDescriptor = [UIFont systemFontOfSize:fontSize].fontDescriptor;
|
||||
|
||||
UIFontDescriptor *finalFontDescriptor = [systemFontDescriptor fontDescriptorWithSymbolicTraits:symbolicTraits];
|
||||
font = [UIFont fontWithDescriptor:finalFontDescriptor size:fontSize];
|
||||
}
|
||||
|
||||
return font;
|
||||
}
|
||||
|
||||
@end
|
||||
|
||||
#pragma mark - Implementation
|
||||
|
||||
@implementation UIFont(DTCoreTextFix)
|
||||
|
||||
// DTCoreText iOS 13 fix. See issue and comment here: https://github.com/Cocoanetics/DTCoreText/issues/1168#issuecomment-583541514
|
||||
// Also see https://github.com/Cocoanetics/DTCoreText/pull/1245 for a possible future solution
|
||||
+ (void)load
|
||||
{
|
||||
static dispatch_once_t onceToken;
|
||||
|
||||
dispatch_once(&onceToken, ^{
|
||||
Class originalClass = object_getClass([UIFont class]);
|
||||
#pragma clang diagnostic push
|
||||
#pragma clang diagnostic ignored "-Wundeclared-selector"
|
||||
SEL originalSelector = @selector(fontWithCTFont:); // DTCoreText method we're overriding
|
||||
SEL ourSelector = @selector(vc_fixedFontWithCTFont:); // Use custom implementation
|
||||
#pragma clang diagnostic pop
|
||||
|
||||
Method originalMethod = class_getClassMethod(originalClass, originalSelector);
|
||||
Method swizzledMethod = class_getClassMethod(originalClass, ourSelector);
|
||||
|
||||
method_exchangeImplementations(originalMethod, swizzledMethod);
|
||||
});
|
||||
}
|
||||
|
||||
@end
|
||||
Reference in New Issue
Block a user