156 lines
7.1 KiB
Swift
156 lines
7.1 KiB
Swift
// RDEPUBJavaScriptBridge.swift
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// 原生与 WebView 之间的 JavaScript 桥接层
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// 定义所有 JS 消息类型（progression/selection/link/error 等），
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// 生成注入到 WebView 的用户脚本，以及分页渲染、搜索高亮等执行脚本。
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import Foundation
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/// JS 桥接消息类型枚举，每种消息对应 WebView 向原生发送的一种事件
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enum RDEPUBJavaScriptBridgeMessage: String, CaseIterable {
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/// 阅读进度变化事件
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case progressionChanged = "ssReaderProgressionChanged"
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/// 文本选择变化事件
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case selectionChanged = "ssReaderSelectionChanged"
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/// 内部链接点击事件（ss-reader:// 协议）
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case internalLink = "ssReaderInternalLink"
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/// 外部链接点击事件（http/https/mailto/tel）
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case externalLink = "ssReaderExternalLink"
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/// JavaScript 运行时错误事件
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case javaScriptError = "ssReaderJSError"
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/// 固定版式渲染就绪事件
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case fixedLayoutReady = "ssReaderFixedLayoutReady"
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}
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/// JavaScript 桥接工具集，负责生成注入脚本和执行脚本
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enum RDEPUBJavaScriptBridge {
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/// 所有需要注册的 JS 消息名称列表，用于 WKUserContentController 注册
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static var messageNames: [String] {
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RDEPUBJavaScriptBridgeMessage.allCases.map(\.rawValue)
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}
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/// 获取注入到 WebView 的桥接用户脚本（在 document end 注入）
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/// 将消息类型占位符替换为实际值，使 JS 端能通过 window.webkit.messageHandlers 发送消息
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static var userScript: String {
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RDEPUBAssetRepository.string(
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for: .bridgeScript,
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replacements: [
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"PROGRESSION_CHANGED_MESSAGE": RDEPUBJavaScriptBridgeMessage.progressionChanged.rawValue,
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"SELECTION_CHANGED_MESSAGE": RDEPUBJavaScriptBridgeMessage.selectionChanged.rawValue,
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"INTERNAL_LINK_MESSAGE": RDEPUBJavaScriptBridgeMessage.internalLink.rawValue,
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"EXTERNAL_LINK_MESSAGE": RDEPUBJavaScriptBridgeMessage.externalLink.rawValue,
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"JAVASCRIPT_ERROR_MESSAGE": RDEPUBJavaScriptBridgeMessage.javaScriptError.rawValue,
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"FIXED_LAYOUT_READY_MESSAGE": RDEPUBJavaScriptBridgeMessage.fixedLayoutReady.rawValue
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]
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)
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}
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/// 生成重排模式下的分页渲染脚本
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/// 注入 CSS 分页样式、设置页码参数、高亮和目标位置，最后触发进度汇报
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/// - Parameter request: 重排渲染请求，包含展示样式、高亮、目标位置等信息
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/// - Returns: 可直接通过 evaluateJavaScript 执行的脚本字符串
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static func applyPresentationScript(for request: RDEPUBReflowableRenderRequest) -> String {
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let style = escapedJavaScriptTemplateLiteral(RDEPUBStyleSheetBuilder.renderCSS(for: request.presentation))
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let pageStride = max(1, request.presentation.viewportSize.width)
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let searchScript = applySearchScript(for: request.searchPresentation)
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return """
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(function() {
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if (!window.RDReaderBridge) { return false; }
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window.RDReaderBridge.applyPagination(`\(style)`);
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window.RDReaderBridge.setPageMetrics(\(request.totalPagesInChapter), \(pageStride));
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window.RDReaderBridge.clearHighlights();
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window.RDReaderBridge.setHighlights(\(jsonString(from: highlightsPayload(request.highlights), fallback: "[]")));
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if (\(jsonString(from: targetLocationPayload(request.targetLocation), fallback: "null")) !== null) {
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window.RDReaderBridge.scrollToLocation(\(jsonString(from: targetLocationPayload(request.targetLocation), fallback: "null")), \(request.pageIndex));
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} else {
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window.RDReaderBridge.scrollToPage(\(request.pageIndex));
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}
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window.RDReaderBridge.reportProgression();
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return true;
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})();
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\(searchScript)
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"""
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}
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/// 生成搜索高亮脚本
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/// 在当前文档和所有 iframe 中查找关键词并用 span 标记高亮，
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/// 活跃匹配项使用特殊样式并自动滚动到视图中央
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/// - Parameter presentation: 搜索展示信息（关键词、各资源的匹配数量等）
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/// - Returns: 搜索高亮脚本字符串
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static func applySearchScript(for presentation: RDEPUBSearchPresentation?) -> String {
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let payload = jsonString(from: searchPayload(presentation), fallback: "null")
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return """
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(function() {
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if (!window.RDReaderBridge) { return false; }
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window.RDReaderBridge.setSearchPresentation(\(payload));
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return true;
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})();
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"""
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}
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static func resolveDecorationsScript() -> String {
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"""
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(function() {
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if (!window.RDReaderBridge) { return { highlights: [], search: [] }; }
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return window.RDReaderBridge.resolveDecorations();
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})();
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"""
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}
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/// 转义字符串中的反斜杠和反引号，避免 JS 模板字面量语法错误
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private static func escapedJavaScriptTemplateLiteral(_ string: String) -> String {
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string
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.replacingOccurrences(of: "\\", with: "\\\\")
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.replacingOccurrences(of: "`", with: "\\`")
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}
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/// 将高亮数组转换为 JS 可用的字典数组
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private static func highlightsPayload(_ highlights: [RDEPUBHighlight]) -> [[String: String]] {
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highlights.compactMap { highlight in
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guard let rangeInfo = highlight.rangeInfo, !rangeInfo.isEmpty else { return nil }
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return [
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"id": highlight.id,
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"rangeInfo": rangeInfo,
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"color": highlight.color,
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"style": highlight.style.rawValue
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]
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}
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}
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/// 将目标位置转换为 JS 可用的字典（含 progression、fragment）
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private static func targetLocationPayload(_ location: RDEPUBLocation?) -> [String: Any]? {
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guard let location else { return nil }
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return [
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"progression": location.progression,
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"lastProgression": location.lastProgression ?? location.progression,
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"fragment": location.fragment as Any
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]
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}
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/// 将搜索展示信息转换为 JS 可用的字典
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private static func searchPayload(_ presentation: RDEPUBSearchPresentation?) -> [String: Any]? {
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guard let presentation else { return nil }
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return [
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"keyword": presentation.keyword,
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"resources": presentation.resources.map { resource in
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[
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"href": resource.href,
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"matchCount": resource.matchCount,
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"activeLocalMatchIndex": resource.activeLocalMatchIndex as Any
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]
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}
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]
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}
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/// 将任意对象序列化为 JSON 字符串，失败时返回 fallback
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private static func jsonString(from object: Any?, fallback: String) -> String {
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guard let object else { return fallback }
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guard JSONSerialization.isValidJSONObject(object),
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let data = try? JSONSerialization.data(withJSONObject: object, options: []),
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let string = String(data: data, encoding: .utf8) else {
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return fallback
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}
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return string
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}
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}
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