Merge pull request #63 from ZhgChgLi/fix/harry/list-indent

[Fix] list item indent with fancy way

Author: zhgchgli0718

Sources/ZMarkupParser/Core/Processor/MarkupNSAttributedStringVisitor.swift

@@ -68,31 +68,14 @@ struct MarkupNSAttributedStringVisitor: MarkupVisitor {
         // We don't set NSTextList to NSParagraphStyle directly, because NSTextList have abnormal extra spaces.
         // ref: https://stackoverflow.com/questions/66714650/nstextlist-formatting
 
-        var level = 0
-        var parentMarkup: Markup? = markup.parentMarkup as? ListMarkup
-        while (parentMarkup != nil) {
-            if parentMarkup is ListMarkup {
-                level += 1
-            }
-            parentMarkup = parentMarkup?.parentMarkup
-        }
-        let indent = String(repeating: "\t", count: level - 1)
-        
         if let parentMarkup = markup.parentMarkup as? ListMarkup {
             let thisAttributedString: NSMutableAttributedString
             if parentMarkup.styleList.type.isOrder() {
                 let siblingListItems = markup.parentMarkup?.childMarkups.filter({ $0 is ListItemMarkup }) ?? []
                 let position = (siblingListItems.firstIndex(where: { $0 === markup }) ?? 0) + parentMarkup.styleList.startingItemNumber
-                thisAttributedString = NSMutableAttributedString(attributedString: makeString(in: markup, string:indent+parentMarkup.styleList.marker(forItemNumber: position)))
+                thisAttributedString = NSMutableAttributedString(attributedString: makeString(in: markup, string:parentMarkup.styleList.marker(forItemNumber: position)))
             } else {
-                thisAttributedString = NSMutableAttributedString(attributedString: makeString(in: markup, string:indent+parentMarkup.styleList.marker(forItemNumber: parentMarkup.styleList.startingItemNumber)))
-            }
-            
-            // Since we use \t as an indentation character, the list text cannot contain \t, otherwise it will cause formatting issues, so we replace \t with spaces directly.
-            var tabRange = attributedString.mutableString.range(of: "\t", options: .caseInsensitive)
-            while tabRange.location != NSNotFound {
-                attributedString.replaceCharacters(in: tabRange, with: "        ") // the default width of a \t character is typically equivalent to 8 spaces
-                tabRange = attributedString.mutableString.range(of: "\t", options: .caseInsensitive)
+                thisAttributedString = NSMutableAttributedString(attributedString: makeString(in: markup, string:parentMarkup.styleList.marker(forItemNumber: parentMarkup.styleList.startingItemNumber)))
             }
 
             attributedString.insert(thisAttributedString, at: 0)

Sources/ZMarkupParser/HTML/Processor/HTMLElementMarkupComponentMarkupStyleVisitor.swift

@@ -76,35 +76,27 @@ struct HTMLElementMarkupComponentMarkupStyleVisitor: MarkupVisitor {
 
     func visit(_ markup: ListMarkup) -> Result {
         var style = defaultVisit(components.value(markup: markup)) ?? MarkupStyle()
-       
-        var level = 1
-        var parentMarkup: Markup? = markup.parentMarkup as? ListMarkup
-        while (parentMarkup != nil) {
-            if parentMarkup is ListMarkup {
-                level += 1
-            }
-            parentMarkup = parentMarkup?.parentMarkup
-        }
+        
 
         let headIndent = (style.font.size ?? 16) * markup.styleList.headIndentMultiply
         let indent = (style.font.size ?? 16) * markup.styleList.indentMultiply
-
-        style.paragraphStyle.headIndent = CGFloat(level) * (style.paragraphStyle.headIndent ?? indent) + headIndent + (indent * CGFloat(level))
+        let dotIndent: CGFloat = (markup.styleList.type.isOrder()) ? (indent) : (0) // for 1. -> "."
 
-        if style.paragraphStyle.tabStops == nil {
-            var tabStops: [NSTextTab] = [.init(textAlignment: .left, location: headIndent)]
-            for i in 1...level {
-                let dotWidth: CGFloat
-                if markup.styleList.type.isOrder() {
-                    dotWidth = indent * CGFloat(i)
-                } else {
-                    dotWidth = 0
-                }
-                tabStops.append(.init(textAlignment: .left, location: CGFloat(i) * indent + headIndent + dotWidth))
+        var parentIndent: CGFloat = 0
+        var parentMarkup: Markup? = markup.parentMarkup
+        while (parentMarkup != nil) {
+            if let thisParentMarkup = parentMarkup as? ListMarkup {
+                parentIndent += visit(markup: thisParentMarkup)?.paragraphStyle.headIndent ?? 0
             }
-            style.paragraphStyle.tabStops = tabStops
+            parentMarkup = parentMarkup?.parentMarkup
         }
+
+        var tabStops: [NSTextTab] = [.init(textAlignment: .left, location: headIndent + parentIndent)]
+        tabStops.append(.init(textAlignment: .left, location: headIndent + parentIndent + dotIndent + indent))
+        
 
+        style.paragraphStyle.tabStops = style.paragraphStyle.tabStops ?? tabStops
+        style.paragraphStyle.headIndent = style.paragraphStyle.headIndent ?? style.paragraphStyle.tabStops?.last?.location
         return style
     }