refactor: split reader architecture and chrome handling

Sources/RDReaderView/EPUBTextRendering/RDEPUBDTCoreTextRenderer.swift

@@ -25,13 +25,6 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
     }
 
     /// 渲染单个章节：HTML → NSAttributedString，同时提取 fragment 和语义标记。
-    ///
-    /// 渲染流程：
-    /// 1. 将 HTML 字符串编码为 Data
-    /// 2. 通过 DTCoreText 解析为富文本（失败则回退到纯文本）
-    /// 3. 注入分页语义标记（${rd-sem-start/end} → 属性字典）
-    /// 4. 提取 fragment 偏移量映射表
-    /// 5. 规范化阅读属性（字体、行距、颜色统一）
     public func renderChapter(
         request: RDEPUBTextChapterRenderRequest
     ) throws -> RDEPUBRenderedChapterContent {
@@ -46,8 +39,8 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
         }
 
         let attributedString = NSMutableAttributedString(attributedString: rendered)
-        RDEPUBTextRendererSupport.applyPaginationSemantics(in: attributedString)
-        let fragmentOffsets = RDEPUBTextRendererSupport.extractFragmentOffsets(from: attributedString)
+        RDEPUBSemanticMarkerInjector.applyPaginationSemantics(in: attributedString)
+        let fragmentOffsets = RDEPUBFragmentMarkerInjector.extractFragmentOffsets(from: attributedString)
         RDEPUBTextRendererSupport.normalizeReadingAttributes(in: attributedString, style: request.style)
         return RDEPUBRenderedChapterContent(
             attributedString: attributedString,
@@ -65,22 +58,24 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
         baseURL: URL?,
         style: RDEPUBTextRenderStyle
     ) throws -> RDEPUBRenderedChapterContent {
-        let request = RDEPUBTextRendererSupport.makeChapterRenderRequest(
-            href: "",
-            title: "",
-            rawHTML: html,
-            baseURL: baseURL,
-            style: style,
-            resourceResolver: nil
-        )
+        let request = RDEPUBTextTypesetterPipeline().makeRequest(
+            from: RDEPUBTypesettingInput(
+                href: "",
+                title: "",
+                rawHTML: html,
+                baseURL: baseURL,
+                style: style,
+                resourceResolver: nil
+            )
+        ).request
         return try renderChapter(request: request)
     }
 
     /// 回退渲染：当 DTCoreText 不可用时，将 HTML 源码当作纯文本处理
     private func fallbackRenderedContent(request: RDEPUBTextChapterRenderRequest) -> RDEPUBRenderedChapterContent {
         let attributedString = RDEPUBTextRendererSupport.fallbackAttributedString(for: request.context.html, style: request.style)
-        RDEPUBTextRendererSupport.applyPaginationSemantics(in: attributedString)
-        let fragmentOffsets = RDEPUBTextRendererSupport.extractFragmentOffsets(from: attributedString)
+        RDEPUBSemanticMarkerInjector.applyPaginationSemantics(in: attributedString)
+        let fragmentOffsets = RDEPUBFragmentMarkerInjector.extractFragmentOffsets(from: attributedString)
         RDEPUBTextRendererSupport.normalizeReadingAttributes(in: attributedString, style: request.style)
         return RDEPUBRenderedChapterContent(
             attributedString: attributedString,
@@ -91,9 +86,6 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
 
 #if canImport(DTCoreText)
     /// 使用 DTCoreText 将 HTML Data 解析为富文本。
-    ///
-    /// 通过 `willFlushCallback` 回调，在每个 DOM 元素最终写入富文本前，
-    /// 对图片附件做尺寸规范化、判断是否为脚注/封面等特殊元素。
     private func makeAttributedString(from data: Data, request: RDEPUBTextChapterRenderRequest) -> NSAttributedString? {
         let builder = DTHTMLAttributedStringBuilder(
             html: data,
@@ -102,7 +94,7 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
         )
         builder?.willFlushCallback = { element in
             guard let element else { return }
-            RDEPUBTextRendererSupport.prepareHTMLElementForReaderRendering(
+            RDEPUBAttachmentNormalizer.prepareHTMLElementForReaderRendering(
                 element,
                 style: request.style,
                 maxImageSize: resolvedMaxImageSize(for: request)
@@ -112,9 +104,6 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
     }
 
     /// 构建 DTCoreText 的解析选项字典，包括字体、行高、图片尺寸限制等。
-    ///
-    /// - 注意：行高倍率计算公式为 `(字体行高 + 行间距) / 字体行高`，
-    ///   确保最终行距与用户设置的 style.lineSpacing 一致。
     private func dtOptions(request: RDEPUBTextChapterRenderRequest) -> [AnyHashable: Any] {
         let style = request.style
         let maxImageSize = resolvedMaxImageSize(for: request)
@@ -139,16 +128,12 @@ public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
     }
 
     private func resolvedMaxImageSize(for request: RDEPUBTextChapterRenderRequest) -> CGSize {
-        if let pageSize = request.pageSize {
-            let layoutConfig = request.layoutConfig ?? .default
-            let contentRect = layoutConfig.contentRect(fallback: pageSize)
-            let maxWidth = max(round(contentRect.width), 1)
-            let maxHeight = max(round(contentRect.height * layoutConfig.imageMaxHeightRatio), 1)
-            return CGSize(width: maxWidth, height: maxHeight)
-        }
-
-        let screenBounds = UIScreen.main.bounds.insetBy(dx: 20, dy: 28)
-        return CGSize(width: max(round(screenBounds.width), 1), height: max(round(screenBounds.height * 0.85), 1))
+        let layoutConfig = request.layoutConfig ?? .default
+        let fallbackPageSize = request.pageSize ?? layoutConfig.fallbackViewportSize
+        let contentRect = layoutConfig.contentRect(fallback: fallbackPageSize)
+        let maxWidth = max(round(contentRect.width), 1)
+        let maxHeight = max(round(contentRect.height * layoutConfig.imageMaxHeightRatio), 1)
+        return CGSize(width: maxWidth, height: maxHeight)
     }
 #endif
 }