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//
// NSAttributedString+NSAttributedString.h
// Juick
//
// Created by Vitaly Takmazov on 23.09.2020.
// Copyright © 2020 com.juick. All rights reserved.
//
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@implementation NSAttributedString (Entities)
NSMutableParagraphStyle *quoteStyle;
UIFont *boldFont;
UIFont *italicFont;
__attribute__((constructor))
static void initialize_fonts() {
quoteStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
quoteStyle.firstLineHeadIndent = 12.0f;
quoteStyle.headIndent = 12.0f;
quoteStyle.paragraphSpacing = 6.0f;
UIFontDescriptor* fontDescriptor = [UIFontDescriptor
preferredFontDescriptorWithTextStyle:UIFontTextStyleBody];
UIFontDescriptor* boldFontDescriptor = [fontDescriptor
fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold];
boldFont = [UIFont fontWithDescriptor:boldFontDescriptor size: 0.0];
UIFontDescriptor* italicFontDescriptor = [fontDescriptor
fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitItalic];
italicFont = [UIFont fontWithDescriptor:italicFontDescriptor size: 0.0];
}
+(NSAttributedString *) attributedStringFromMessage:(Message *)msg {
if (msg.text) {
NSMutableAttributedString *txt = [[NSMutableAttributedString alloc]
initWithString:msg.text
attributes:@{NSFontAttributeName:[UIFont preferredFontForTextStyle:UIFontTextStyleBody],
NSForegroundColorAttributeName:[UIColor colorNamed:@"Text"]
}];
[txt beginEditing];
for (Entity *entity in msg.entities) {
NSUInteger start = entity.start ? [entity.start unsignedIntegerValue] : 0;
NSUInteger end = entity.end ? [entity.end unsignedIntegerValue] : 0;
NSString *text = entity.text ? entity.text : @"";
NSRange currentRange = NSMakeRange(start, end - start);
[txt addAttribute:@"displayText" value:text range:currentRange];
if ([entity.type isEqualToString:@"a"]) {
[txt addAttribute:NSLinkAttributeName value:entity.link range:currentRange];
}
if ([entity.type isEqualToString:@"q"]) {
[txt addAttribute:NSForegroundColorAttributeName value:[UIColor colorNamed:@"Muted"] range:currentRange];
[txt addAttribute:NSParagraphStyleAttributeName value:quoteStyle range:currentRange];
}
if ([entity.type isEqualToString:@"u"]) {
[txt addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:currentRange];
}
if ([entity.type isEqualToString:@"b"]) {
[txt addAttribute:NSFontAttributeName value:boldFont range:currentRange];
}
if ([entity.type isEqualToString:@"i"]) {
[txt addAttribute:NSFontAttributeName value:italicFont range:currentRange];
}
}
[txt enumerateAttribute:@"displayText" inRange:NSMakeRange(0, [txt length]) options:0 usingBlock:^(id _Nullable value, NSRange range, BOOL * _Nonnull stop) {
if (value) {
[txt replaceCharactersInRange:range withString:value];
}
}];
if ([msg.tags count] > 0) {
NSString *tagsList = [NSString stringWithFormat:@"%@\n", [msg.tags componentsJoinedByString:@", "]];
[txt insertAttributedString:[[NSAttributedString alloc]
initWithString:tagsList
attributes:@{
NSFontAttributeName:italicFont,
NSForegroundColorAttributeName:[UIColor colorNamed:@"Muted"]
}] atIndex:0];
}
[txt endEditing];
return txt;
} else {
return [[NSAttributedString alloc] initWithString:@""];
}
}
@end
NS_ASSUME_NONNULL_END
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