1 files changed, 90 insertions, 0 deletions
diff --git a/Juick/Helpers/NSAttributedString_Entities.m b/Juick/Helpers/NSAttributedString_Entities.m
new file mode 100644
index 0000000..3f7159b
--- /dev/null
+++ b/Juick/Helpers/NSAttributedString_Entities.m
@@ -0,0 +1,90 @@
+//
+//  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