131 lines
4.5 KiB
Swift
131 lines
4.5 KiB
Swift
import Foundation
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import Ink
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struct PageContentGenerator {
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private let files: FileProcessor
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init(files: FileProcessor) {
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self.files = files
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}
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func generate(page: Page, language: String, at url: URL) throws -> String {
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var errorToThrow: Error? = nil
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let content = try wrap(.missingPage(page: url.path, language: language)) {
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try String(contentsOf: url)
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}
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var hasCodeContent = false
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let imageModifier = Modifier(target: .images) { html, markdown in
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let result = processMarkdownImage(markdown: markdown, html: html, page: page)
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switch result {
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case .success(let content):
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return content
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case .failure(let error):
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errorToThrow = error
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return ""
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}
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}
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let codeModifier = Modifier(target: .codeBlocks) { html, markdown in
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if markdown.starts(with: "```swift") {
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#warning("Syntax highlight swift code")
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return html
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}
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hasCodeContent = true
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return html
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}
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let parser = MarkdownParser(modifiers: [imageModifier, codeModifier])
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#warning("Check links in markdown for (missing) files to copy")
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if hasCodeContent {
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#warning("Automatically add hljs hightlighting if code samples are found")
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}
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let result = parser.html(from: content)
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if let error = errorToThrow {
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throw error
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}
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return result
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}
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private func processMarkdownImage(markdown: Substring, html: String, page: Page) -> Result<String, Error> {
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let fileAndTitle = markdown
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.components(separatedBy: "(").last!
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.components(separatedBy: ")").first!
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let file = fileAndTitle.components(separatedBy: " \"").first! // Remove title
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let rightSubtitle: String?
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if fileAndTitle.contains(" \"") {
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rightSubtitle = fileAndTitle.dropBeforeFirst("\"").dropAfterLast("\"")
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} else {
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rightSubtitle = nil
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}
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let leftSubtitle = markdown
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.components(separatedBy: "]").first!
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.components(separatedBy: "[").last!.nonEmpty
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#warning("Specify page image width in configuration")
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let pageImageWidth = 748
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let size: NSSize
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let imagePath = page.pathRelativeToRootForContainedInputFile(file)
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do {
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size = try files.requireImage(
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source: imagePath,
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destination: imagePath,
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width: pageImageWidth,
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desiredHeight: nil,
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createDoubleVersion: true)
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} catch {
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return .failure(error)
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}
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let file2x = file.insert("@2x", beforeLast: ".")
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#warning("Move HTML code to single location")
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let result = articelImage(
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image: file,
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image2x: file2x,
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width: size.width,
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height: size.height,
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rightSubtitle: rightSubtitle,
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leftSubtitle: leftSubtitle)
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return .success(result)
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}
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private func articelImage(image: String, image2x: String, width: CGFloat, height: CGFloat, rightSubtitle: String?, leftSubtitle: String?) -> String {
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let subtitleCode = subtitle(left: leftSubtitle, right: rightSubtitle)
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return fullImageCode(image: image, image2x: image2x, width: width, height: height, subtitle: subtitleCode)
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}
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private func articleImageWithoutSubtitle(image: String, image2x: String, width: CGFloat, height: CGFloat) -> String {
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"""
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<span class="image">
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<img src="\(image)" srcset="\(image2x) 2x" width="\(Int(width))" height="\(Int(height))" loading="lazy"/>
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</span>
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"""
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}
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private func subtitle(left: String?, right: String?) -> String {
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guard left != nil || right != nil else {
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return ""
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}
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let leftCode = left.unwrapped { "<span class=\"left\">\($0)</span>" } ?? ""
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let rightCode = right.unwrapped { "<span class=\"right\">\($0)</span>" } ?? ""
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return """
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<div class="subtitle">
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\(leftCode)
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\(rightCode)
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</div>
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"""
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}
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private func fullImageCode(image: String, image2x: String, width: CGFloat, height: CGFloat, subtitle: String) -> String {
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"""
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<span class="image">
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<img src="\(image)" srcset="\(image2x) 2x" width="\(Int(width))" height="\(Int(height))" loading="lazy"/>
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\(subtitle)
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</span>
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"""
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}
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}
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