mirror of
https://github.com/Novaloop-AG/element-x-ios.git
synced 2026-11-02 21:33:26 +00:00
Added link detection in plain text (not available ootb in SwiftUI) and support for user, room, event and group identifiers + room aliases.
This commit is contained in:
Stefan Ceriu
@@ -15,8 +15,57 @@
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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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static NSRegularExpression *userIdRegex;
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static NSRegularExpression *roomIdRegex;
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static NSRegularExpression *roomAliasRegex;
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static NSRegularExpression *eventIdRegex;
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static NSRegularExpression *groupIdRegex;
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static NSRegularExpression *httpLinksRegex;
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static NSRegularExpression *htmlTagsRegex;
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#define MATRIX_HOMESERVER_DOMAIN_REGEX @"[A-Z0-9]+((\\.|\\-)[A-Z0-9]+){0,}(:[0-9]{2,5})?"
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NSString *const kMXToolsRegexStringForMatrixUserIdentifier = @"@[\\x21-\\x39\\x3B-\\x7F]+:" MATRIX_HOMESERVER_DOMAIN_REGEX;
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NSString *const kMXToolsRegexStringForMatrixRoomAlias = @"#[A-Z0-9._%#@=+-]+:" MATRIX_HOMESERVER_DOMAIN_REGEX;
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NSString *const kMXToolsRegexStringForMatrixRoomIdentifier = @"![A-Z0-9]+:" MATRIX_HOMESERVER_DOMAIN_REGEX;
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NSString *const kMXToolsRegexStringForMatrixEventIdentifier = @"\\$[A-Z0-9]+:" MATRIX_HOMESERVER_DOMAIN_REGEX;
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NSString *const kMXToolsRegexStringForMatrixEventIdentifierV3 = @"\\$[A-Z0-9\\/+]+";
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NSString *const kMXToolsRegexStringForMatrixGroupIdentifier = @"\\+[A-Z0-9=_\\-./]+:" MATRIX_HOMESERVER_DOMAIN_REGEX;
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@implementation AttributedStringBuilderUtils
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+ (void)initialize
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{
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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userIdRegex = [NSRegularExpression regularExpressionWithPattern:kMXToolsRegexStringForMatrixUserIdentifier options:NSRegularExpressionCaseInsensitive error:nil];
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roomIdRegex = [NSRegularExpression regularExpressionWithPattern:kMXToolsRegexStringForMatrixRoomIdentifier options:NSRegularExpressionCaseInsensitive error:nil];
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roomAliasRegex = [NSRegularExpression regularExpressionWithPattern:kMXToolsRegexStringForMatrixRoomAlias options:NSRegularExpressionCaseInsensitive error:nil];
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eventIdRegex = [NSRegularExpression regularExpressionWithPattern:kMXToolsRegexStringForMatrixEventIdentifier options:NSRegularExpressionCaseInsensitive error:nil];
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groupIdRegex = [NSRegularExpression regularExpressionWithPattern:kMXToolsRegexStringForMatrixGroupIdentifier options:NSRegularExpressionCaseInsensitive error:nil];
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httpLinksRegex = [NSRegularExpression regularExpressionWithPattern:@"(?i)\\b(https?://.*)\\b" options:NSRegularExpressionCaseInsensitive error:nil];
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htmlTagsRegex = [NSRegularExpression regularExpressionWithPattern:@"<(\\w+)[^>]*>" options:NSRegularExpressionCaseInsensitive error:nil];
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});
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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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+ (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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+ (NSAttributedString *)removeDTCoreTextArtifacts:(NSAttributedString *)attributedString
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{
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NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
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@@ -91,11 +140,6 @@ NSString *const kMXKToolsBlockquoteMarkAttribute = @"kMXKToolsBlockquoteMarkAttr
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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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@@ -172,29 +216,125 @@ NSString *const kMXKToolsBlockquoteMarkAttribute = @"kMXKToolsBlockquoteMarkAttr
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return mutableAttributedString;
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}
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+ (NSUInteger)rgbValueWithColor:(UIColor*)color
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+ (NSAttributedString*)createLinks:(NSAttributedString*)attributedString
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{
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CGFloat red, green, blue, alpha;
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if (!attributedString)
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{
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return nil;
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}
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[color getRed:&red green:&green blue:&blue alpha:&alpha];
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NSMutableAttributedString *postRenderAttributedString;
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NSUInteger rgbValue = ((int)(red * 255) << 16) + ((int)(green * 255) << 8) + (blue * 255);
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[[self class] createHTTPLinksInAttributedString:attributedString withWorkingAttributedString:&postRenderAttributedString];
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[[self class] createLinksInAttributedString:attributedString matchingRegex:userIdRegex withWorkingAttributedString:&postRenderAttributedString];
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[[self class] createLinksInAttributedString:attributedString matchingRegex:roomIdRegex withWorkingAttributedString:&postRenderAttributedString];
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[[self class] createLinksInAttributedString:attributedString matchingRegex:roomAliasRegex withWorkingAttributedString:&postRenderAttributedString];
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[[self class] createLinksInAttributedString:attributedString matchingRegex:eventIdRegex withWorkingAttributedString:&postRenderAttributedString];
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[[self class] createLinksInAttributedString:attributedString matchingRegex:groupIdRegex withWorkingAttributedString:&postRenderAttributedString];
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return rgbValue;
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return postRenderAttributedString ? postRenderAttributedString : attributedString;
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}
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+ (void)enumerateMarkedBlockquotesInAttributedString:(NSAttributedString*)attributedString usingBlock:(void (^)(NSRange range, BOOL *stop))block
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+ (void)createHTTPLinksInAttributedString:(NSAttributedString*)attributedString
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withWorkingAttributedString:(NSMutableAttributedString* __autoreleasing *)mutableAttributedString
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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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// Enumerate each string matching the regex
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[httpLinksRegex enumerateMatchesInString:attributedString.string options:0 range:NSMakeRange(0, attributedString.length) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop) {
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// Do not create a link if there is already one on the found match
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__block BOOL hasAlreadyLink = NO;
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[attributedString enumerateAttributesInRange:match.range options:0 usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {
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if (attrs[NSLinkAttributeName])
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{
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hasAlreadyLink = YES;
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*stop = YES;
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}
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}];
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if (!hasAlreadyLink)
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{
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// Create the output string only if it is necessary because attributed strings cost CPU
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if (!*mutableAttributedString)
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{
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*mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
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}
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// Make the link clickable
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// Caution: We need here to escape the non-ASCII characters (like '#' in room alias)
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// to convert the link into a legal URL string.
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NSString *link = [attributedString.string substringWithRange:match.range];
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link = [link stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
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[*mutableAttributedString addAttribute:NSLinkAttributeName value:link range:match.range];
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[*mutableAttributedString addAttribute:NSForegroundColorAttributeName value:UIColor.blueColor range:match.range];
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}
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}];
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}
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+ (void)createLinksInAttributedString:(NSAttributedString*)attributedString
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matchingRegex:(NSRegularExpression*)regex
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withWorkingAttributedString:(NSMutableAttributedString* __autoreleasing *)mutableAttributedString
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{
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__block NSArray *linkMatches;
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// Enumerate each string matching the regex
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[regex enumerateMatchesInString:attributedString.string options:0 range:NSMakeRange(0, attributedString.length) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop) {
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// Do not create a link if there is already one on the found match
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__block BOOL hasAlreadyLink = NO;
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[attributedString enumerateAttributesInRange:match.range options:0 usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {
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if (attrs[NSLinkAttributeName])
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{
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hasAlreadyLink = YES;
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*stop = YES;
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}
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}];
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// Do not create a link if the match is part of an http link.
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// The http link will be automatically generated by the UI afterwards.
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// So, do not break it now by adding a link on a subset of this http link.
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if (!hasAlreadyLink)
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{
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if (!linkMatches)
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{
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// Search for the links in the string only once
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// Do not use NSDataDetector with NSTextCheckingTypeLink because is not able to
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// manage URLs with 2 hashes like "https://matrix.to/#/#matrix:matrix.org"
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// Such URL is not valid but web browsers can open them and users C+P them...
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// NSDataDetector does not support it but UITextView and UIDataDetectorTypeLink
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// detect them when they are displayed. So let the UI create the link at display.
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linkMatches = [httpLinksRegex matchesInString:attributedString.string options:0 range:NSMakeRange(0, attributedString.length)];
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}
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for (NSTextCheckingResult *linkMatch in linkMatches)
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{
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// If the match is fully in the link, skip it
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if (NSIntersectionRange(match.range, linkMatch.range).length == match.range.length)
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{
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hasAlreadyLink = YES;
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break;
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}
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}
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}
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if (!hasAlreadyLink)
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{
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// Create the output string only if it is necessary because attributed strings cost CPU
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if (!*mutableAttributedString)
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{
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*mutableAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
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}
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// Make the link clickable
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// Caution: We need here to escape the non-ASCII characters (like '#' in room alias)
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// to convert the link into a legal URL string.
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NSString *link = [attributedString.string substringWithRange:match.range];
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link = [link stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
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[*mutableAttributedString addAttribute:NSLinkAttributeName value:link range:match.range];
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[*mutableAttributedString addAttribute:NSForegroundColorAttributeName value:UIColor.blueColor range:match.range];
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}
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}];
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}
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@end
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