import Foundation import Ink import Splash struct PageContentGenerator { private let largeImageIndicator = "*large*" private let factory: TemplateFactory private let swift = SyntaxHighlighter(format: HTMLOutputFormat()) private let siteRoot: Element private let results: GenerationResultsHandler init(factory: TemplateFactory, siteRoot: Element, results: GenerationResultsHandler) { self.factory = factory self.siteRoot = siteRoot self.results = results } func generate(page: Element, language: String, content: String) -> (content: String, includesCode: Bool) { var hasCodeContent = false var largeImageCount = 0 let imageModifier = Modifier(target: .images) { html, markdown in processMarkdownImage(markdown: markdown, html: html, page: page, language: language, largeImageCount: &largeImageCount) } let codeModifier = Modifier(target: .codeBlocks) { html, markdown in if markdown.starts(with: "```swift") { let code = markdown.between("```swift", and: "```").trimmed return "
" + swift.highlight(code) + "
" } hasCodeContent = true return html } let linkModifier = Modifier(target: .links) { html, markdown in handleLink(page: page, language: language, html: html, markdown: markdown) } let htmlModifier = Modifier(target: .html) { html, markdown in handleHTML(page: page, language: language, html: html, markdown: markdown) } let parser = MarkdownParser(modifiers: [imageModifier, codeModifier, linkModifier, htmlModifier]) return (parser.html(from: content), hasCodeContent) } private func handleLink(page: Element, language: String, html: String, markdown: Substring) -> String { let file = markdown.between("(", and: ")") if file.hasPrefix("page:") { let pageId = file.replacingOccurrences(of: "page:", with: "") guard let pagePath = results.getPagePath(for: pageId, source: page.path, language: language) else { // Remove link since the page can't be found return markdown.between("[", and: "]") } // Adjust file path to get the page url let url = page.relativePathToOtherSiteElement(file: pagePath) return html.replacingOccurrences(of: file, with: url) } if let filePath = page.nonAbsolutePathRelativeToRootForContainedInputFile(file) { // The target of the page link must be present after generation is complete results.expect(file: filePath, source: page.path) } return html } private func handleHTML(page: Element, language: String, html: String, markdown: Substring) -> String { // TODO: Check HTML code in markdown for required resources //print("[HTML] Found in page \(page.path):") //print(markdown) // Things to check: // String { // Split the markdown ![alt](file title) // There are several known shorthand commands // For images: ![*large* left_title](file right_title) // For videos: ![option1,option2,...](file) // For svg with custom area: ![x,y,width,height](file.svg) // For downloads: ![download](file1, text1; file2, text2, ...) // For a simple boxes: ![box](title;body) // A fancy page link: ![page](page_id) // External pages: ![external](url1, text1; url2, text2, ...) guard let fileAndTitle = markdown.between(first: "](", andLast: ")").removingPercentEncoding else { results.warning("Invalid percent encoding for markdown image", source: page.path) return "" } let alt = markdown.between("[", and: "]").nonEmpty?.removingPercentEncoding if let alt = alt, let command = ShorthandMarkdownKey(rawValue: alt) { return handleShortHandCommand(command, page: page, language: language, content: fileAndTitle) } let file = fileAndTitle.dropAfterFirst(" ") let title = fileAndTitle.contains(" ") ? fileAndTitle.dropBeforeFirst(" ").nonEmpty : nil let fileExtension = file.lastComponentAfter(".").lowercased() if let _ = ImageType(fileExtension: fileExtension) { return handleImage(page: page, file: file, rightTitle: title, leftTitle: alt, largeImageCount: &largeImageCount) } if let _ = VideoType(rawValue: fileExtension) { return handleVideo(page: page, file: file, optionString: alt) } switch fileExtension { case "svg": return handleSvg(page: page, file: file, area: alt) case "gif": return handleGif(page: page, file: file, altText: alt ?? "gif image") default: return handleFile(page: page, file: file, fileExtension: fileExtension) } } private func handleShortHandCommand(_ command: ShorthandMarkdownKey, page: Element, language: String, content: String) -> String { switch command { case .downloadButtons: return handleDownloadButtons(page: page, content: content) case .externalLink: return handleExternalButtons(page: page, content: content) case .includedHtml: return handleExternalHTML(page: page, file: content) case .box: return handleSimpleBox(page: page, content: content) case .pageLink: return handlePageLink(page: page, language: language, pageId: content) } } private func handleImage(page: Element, file: String, rightTitle: String?, leftTitle: String?, largeImageCount: inout Int) -> String { let imagePath = page.pathRelativeToRootForContainedInputFile(file) let left: String let createFullScreenVersion: Bool if let leftTitle { createFullScreenVersion = leftTitle.hasPrefix(largeImageIndicator) left = leftTitle.dropBeforeFirst(largeImageIndicator).trimmed } else { left = "" createFullScreenVersion = false } let size = results.requireFullSizeMultiVersionImage( source: imagePath, destination: imagePath, requiredBy: page.path) let altText = left.nonEmpty ?? rightTitle ?? "image" var content = [PageImageTemplateKey : String]() content[.altText] = altText content[.image] = file.dropAfterLast(".") content[.imageExtension] = file.lastComponentAfter(".") content[.width] = "\(Int(size.width))" content[.height] = "\(Int(size.height))" content[.leftText] = left content[.rightText] = rightTitle ?? "" guard createFullScreenVersion else { return factory.image.generate(content) } results.requireOriginalSizeImages( source: imagePath, destination: imagePath, requiredBy: page.path) largeImageCount += 1 content[.number] = "\(largeImageCount)" return factory.largeImage.generate(content) } private func handleVideo(page: Element, file: String, optionString: String?) -> String { let options: [PageVideoTemplate.VideoOption] = optionString.unwrapped { string in string.components(separatedBy: " ").compactMap { optionText -> PageVideoTemplate.VideoOption? in guard let optionText = optionText.trimmed.nonEmpty else { return nil } guard let option = PageVideoTemplate.VideoOption(rawValue: optionText) else { results.warning("Unknown video option \(optionText)", source: page.path) return nil } return option } } ?? [] // TODO: Check page folder for alternative video versions let sources: [PageVideoTemplate.VideoSource] = [(url: file, type: .mp4)] let filePath = page.pathRelativeToRootForContainedInputFile(file) results.require(file: filePath, source: page.path) return factory.video.generate(sources: sources, options: options) } private func handleGif(page: Element, file: String, altText: String) -> String { let imagePath = page.pathRelativeToRootForContainedInputFile(file) results.require(file: imagePath, source: page.path) guard let size = results.getImageSize(atPath: imagePath, source: page.path) else { return "" } let width = Int(size.width) let height = Int(size.height) return factory.html.image(file: file, width: width, height: height, altText: altText) } private func handleSvg(page: Element, file: String, area: String?) -> String { let imagePath = page.pathRelativeToRootForContainedInputFile(file) results.require(file: imagePath, source: page.path) guard let size = results.getImageSize(atPath: imagePath, source: page.path) else { return "" // Missing image warning already produced } let width = Int(size.width) let height = Int(size.height) var altText = "image " + file.lastComponentAfter("/") guard let area = area else { return factory.html.image(file: file, width: width, height: height, altText: altText) } let parts = area.components(separatedBy: ",").map { $0.trimmed } switch parts.count { case 1: return factory.html.image(file: file, width: width, height: height, altText: parts[0]) case 4: break case 5: altText = parts[4] default: results.warning("Invalid area string for svg image", source: page.path) return factory.html.image(file: file, width: width, height: height, altText: altText) } guard let x = Int(parts[0]), let y = Int(parts[1]), let partWidth = Int(parts[2]), let partHeight = Int(parts[3]) else { results.warning("Invalid area string for svg image", source: page.path) return factory.html.image(file: file, width: width, height: height, altText: altText) } let part = SVGSelection(x, y, partWidth, partHeight) return factory.html.svgImage(file: file, part: part, altText: altText) } private func handleFile(page: Element, file: String, fileExtension: String) -> String { results.warning("Unhandled file \(file) with extension \(fileExtension)", source: page.path) return "" } private func handleDownloadButtons(page: Element, content: String) -> String { let buttons = content .components(separatedBy: ";") .compactMap { button -> (file: String, text: String, downloadName: String?)? in let parts = button.components(separatedBy: ",") guard parts.count == 2 || parts.count == 3 else { results.warning("Invalid download definition with \(parts)", source: page.path) return nil } let file = parts[0].trimmed let title = parts[1].trimmed let downloadName = parts.count == 3 ? parts[2].trimmed : nil // Ensure that file is available let filePath = page.pathRelativeToRootForContainedInputFile(file) results.require(file: filePath, source: page.path) return (file, title, downloadName) } return factory.html.downloadButtons(buttons) } private func handleExternalButtons(page: Element, content: String) -> String { let buttons = content .components(separatedBy: ";") .compactMap { button -> (url: String, text: String)? in let parts = button.components(separatedBy: ",") guard parts.count == 2 else { results.warning("Invalid external link definition", source: page.path) return nil } guard let url = parts[0].trimmed.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else { results.warning("Invalid external link \(parts[0].trimmed)", source: page.path) return nil } let title = parts[1].trimmed return (url, title) } return factory.html.externalButtons(buttons) } private func handleExternalHTML(page: Element, file: String) -> String { let path = page.pathRelativeToRootForContainedInputFile(file) return results.getContentOfRequiredFile(at: path, source: page.path) ?? "" } private func handleSimpleBox(page: Element, content: String) -> String { let parts = content.components(separatedBy: ";") guard parts.count > 1 else { results.warning("Invalid box specification", source: page.path) return "" } let title = parts[0] let text = parts.dropFirst().joined(separator: ";") return factory.makePlaceholder(title: title, text: text) } private func handlePageLink(page: Element, language: String, pageId: String) -> String { guard let linkedPage = siteRoot.find(pageId) else { // Checking the page path will add it to the missing pages _ = results.getPagePath(for: pageId, source: page.path, language: language) // Remove link since the page can't be found return "" } var content = [PageLinkTemplate.Key: String]() content[.title] = linkedPage.title(for: language) content[.altText] = "" let fullThumbnailPath = linkedPage.thumbnailFilePath(for: language).destination // Note: Here we assume that the thumbnail was already used elsewhere, so already generated let relativeImageUrl = page.relativePathToOtherSiteElement(file: fullThumbnailPath) let metadata = linkedPage.localized(for: language) if linkedPage.state.hasThumbnailLink { let fullPageUrl = linkedPage.fullPageUrl(for: language) let relativePageUrl = page.relativePathToOtherSiteElement(file: fullPageUrl) content[.url] = "href=\"\(relativePageUrl)\"" } content[.image] = relativeImageUrl.dropAfterLast(".") if let suffix = metadata.thumbnailSuffix { content[.title] = factory.html.make(title: metadata.title, suffix: suffix) } else { content[.title] = metadata.title } let path = linkedPage.makePath(language: language, from: siteRoot) content[.path] = factory.pageLink.makePath(components: path) content[.description] = metadata.relatedContentText if let parent = linkedPage.findParent(from: siteRoot), parent.thumbnailStyle == .large { content[.className] = " related-page-link-large" } // We assume that the thumbnail images are already required by overview pages. return factory.pageLink.generate(content) } }