Epub阅读器0.0.1

2026-05-21 19:40:51 +08:00
commit daa36d8fe7
559 changed files with 106266 additions and 0 deletions
@@ -0,0 +1,80 @@
+import UIKit
+
+#if canImport(DTCoreText)
+import DTCoreText
+#endif
+
+public struct RDEPUBDTCoreTextRenderer: RDEPUBTextRenderer {
+    public init() {}
+
+    public static var isAvailable: Bool {
+#if canImport(DTCoreText)
+        return true
+#else
+        return false
+#endif
+    }
+
+    public func renderChapter(
+        html: String,
+        baseURL: URL?,
+        style: RDEPUBTextRenderStyle
+    ) throws -> RDEPUBRenderedChapterContent {
+#if canImport(DTCoreText)
+        let markedHTML = RDEPUBTextRendererSupport.injectFragmentMarkers(into: html)
+        guard let data = markedHTML.data(using: .utf8) else {
+            throw RDEPUBTextRenderingError.htmlEncodingFailed
+        }
+
+        guard let rendered = makeAttributedString(from: data, baseURL: baseURL, style: style) else {
+            return fallbackRenderedContent(for: markedHTML, style: style)
+        }
+
+        let attributedString = NSMutableAttributedString(attributedString: rendered)
+        let fragmentOffsets = RDEPUBTextRendererSupport.extractFragmentOffsets(from: attributedString)
+        RDEPUBTextRendererSupport.normalizeReadingAttributes(in: attributedString, style: style)
+        return RDEPUBRenderedChapterContent(attributedString: attributedString, fragmentOffsets: fragmentOffsets)
+#else
+        let markedHTML = RDEPUBTextRendererSupport.injectFragmentMarkers(into: html)
+        return fallbackRenderedContent(for: markedHTML, style: style)
+#endif
+    }
+
+    private func fallbackRenderedContent(for html: String, style: RDEPUBTextRenderStyle) -> RDEPUBRenderedChapterContent {
+        let attributedString = RDEPUBTextRendererSupport.fallbackAttributedString(for: html, style: style)
+        let fragmentOffsets = RDEPUBTextRendererSupport.extractFragmentOffsets(from: attributedString)
+        RDEPUBTextRendererSupport.normalizeReadingAttributes(in: attributedString, style: style)
+        return RDEPUBRenderedChapterContent(attributedString: attributedString, fragmentOffsets: fragmentOffsets)
+    }
+
+#if canImport(DTCoreText)
+    private func makeAttributedString(from data: Data, baseURL: URL?, style: RDEPUBTextRenderStyle) -> NSAttributedString? {
+        let builder = DTHTMLAttributedStringBuilder(
+            html: data,
+            options: dtOptions(baseURL: baseURL, style: style),
+            documentAttributes: nil
+        )
+        return builder?.generatedAttributedString()
+    }
+
+    private func dtOptions(baseURL: URL?, style: RDEPUBTextRenderStyle) -> [AnyHashable: Any] {
+        var options: [AnyHashable: Any] = [
+            NSTextSizeMultiplierDocumentOption: 1.0,
+            DTDefaultFontFamily: style.font.familyName,
+            DTDefaultFontName: style.font.fontName,
+            DTDefaultFontSize: style.font.pointSize,
+            DTDefaultLineHeightMultiplier: max((style.font.lineHeight + style.lineSpacing) / max(style.font.lineHeight, 1), 1),
+            DTUseiOS6Attributes: true
+        ]
+
+        if let baseURL {
+            options[NSBaseURLDocumentOption] = baseURL
+        }
+        if let textColor = style.textColor {
+            options[DTDefaultTextColor] = textColor
+        }
+
+        return options
+    }
+#endif
+}