Refactor InstantPageUI and related modules

submodules/InstantPageUI/Sources/InstantPageLayoutSpacings.swift

@@ -0,0 +1,65 @@
+import Foundation
+import UIKit
+import TelegramCore
+
+func spacingBetweenBlocks(upper: InstantPageBlock?, lower: InstantPageBlock?) -> CGFloat {
+    if let upper = upper, let lower = lower {
+        switch (upper, lower) {
+            case (_, .cover), (_, .channelBanner), (.details, .details), (.relatedArticles, nil), (_, .anchor):
+                return 0.0
+            case (.divider, _), (_, .divider):
+                return 25.0
+            case (_, .blockQuote), (.blockQuote, _), (_, .pullQuote), (.pullQuote, _):
+                return 27.0
+            case (.kicker, .title), (.cover, .title):
+                return 16.0
+            case (_, .title):
+                return 20.0
+            case (.title, .authorDate), (.subtitle, .authorDate):
+                return 18.0
+            case (_, .authorDate):
+                return 20.0
+            case (.title, .paragraph), (.authorDate, .paragraph):
+                return 34.0
+            case (.header, .paragraph), (.subheader, .paragraph):
+                return 25.0
+            case (.list, .paragraph):
+                return 31.0
+            case (.preformatted, .paragraph):
+                return 19.0
+            case (.paragraph, .paragraph):
+                return 25.0
+            case (_, .paragraph):
+                return 20.0
+            case (.title, .list), (.authorDate, .list):
+                return 34.0
+            case (.header, .list), (.subheader, .list):
+                return 31.0
+            case (.preformatted, .list):
+                return 19.0
+            case (_, .list):
+                return 25.0
+            case (.paragraph, .preformatted):
+                return 19.0
+            case (_, .preformatted):
+                return 20.0
+            case (_, .header), (_, .subheader):
+                return 32.0
+            default:
+                return 20.0
+        }
+    } else if let lower = lower {
+        switch lower {
+            case .cover, .channelBanner, .details, .anchor:
+                return 0.0
+            default:
+                return 25.0
+        }
+    } else {
+        if let upper = upper, case .relatedArticles = upper {
+            return 0.0
+        } else {
+            return 25.0
+        }
+    }
+}