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TelegramUI/AddFormatToStringWithRanges.swift

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+import Foundation
+
+func addAttributesToStringWithRanges(_ stringWithRanges: (String, [(Int, NSRange)]), body: MarkdownAttributeSet, argumentAttributes: [Int: MarkdownAttributeSet], textAlignment: NSTextAlignment = .natural) -> NSAttributedString {
+    let result = NSMutableAttributedString()
+    
+    var bodyAttributes: [String: Any] = [NSFontAttributeName: body.font, NSForegroundColorAttributeName: body.textColor, NSParagraphStyleAttributeName: paragraphStyleWithAlignment(textAlignment)]
+    if !body.additionalAttributes.isEmpty {
+        for (key, value) in body.additionalAttributes {
+            bodyAttributes[key] = value
+        }
+    }
+    
+    result.append(NSAttributedString(string: stringWithRanges.0, attributes: bodyAttributes))
+    
+    for (index, range) in stringWithRanges.1 {
+        if let attributes = argumentAttributes[index] {
+            var argumentAttributes: [String: Any] = [NSFontAttributeName: attributes.font, NSForegroundColorAttributeName: attributes.textColor, NSParagraphStyleAttributeName: paragraphStyleWithAlignment(textAlignment)]
+            if !attributes.additionalAttributes.isEmpty {
+                for (key, value) in attributes.additionalAttributes {
+                    argumentAttributes[key] = value
+                }
+            }
+            result.addAttributes(argumentAttributes, range: range)
+        }
+    }
+    
+    return result
+}