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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + diff --git a/Package.resolved b/Package.resolved new file mode 100644 index 0000000..e027a09 --- /dev/null +++ b/Package.resolved @@ -0,0 +1,25 @@ +{ + "object": { + "pins": [ + { + "package": "cmark-gfm", + "repositoryURL": "https://github.com/apple/swift-cmark.git", + "state": { + "branch": "gfm", + "revision": "86aeb491675de6f077a3a6df6cbcac1a25dcbee1", + "version": null + } + }, + { + "package": "swift-markdown", + "repositoryURL": "https://github.com/apple/swift-markdown.git", + "state": { + "branch": "main", + "revision": "2c88ee595f84aa81aee6eaccf6705bba4f40c947", + "version": null + } + } + ] + }, + "version": 1 +} diff --git a/Package.swift b/Package.swift new file mode 100644 index 0000000..3e1d457 --- /dev/null +++ b/Package.swift @@ -0,0 +1,18 @@ +// swift-tools-version:5.2 +import PackageDescription + +let package = Package( + name: "SwiftMarkdownHtml", + products: [ + .library(name: "MarkdownHtml", targets: ["MarkdownHtml"]) + ], + dependencies: [ + .package(url: "https://github.com/apple/swift-markdown.git", .branch("main")), + ], + targets: [ + .target(name: "MarkdownHtml", dependencies: [ + .product(name: "Markdown", package: "swift-markdown"), + ], path: "Sources"), + .testTarget(name: "MarkdownHtmlTests", dependencies: ["MarkdownHtml"]) + ] +) diff --git a/README.md b/README.md new file mode 100644 index 0000000..aa98f8c --- /dev/null +++ b/README.md @@ -0,0 +1,29 @@ + +# MarkdownHtml for Swift +This library is an attempt to allow for easy markdown to HTML conversion. + +## Concepts & Usage + +It's built as a `string` extension to allow for easy conversions: +```swift +let html = "# my markdown text".renderMarkdownToXML() +``` + +## Config +The following config options are available: +### HTML Tags +The only config we have thus far is that you can pick how to render HTML tags from the Markdown. + +You can pick between: +* `hide`: Does not render the HTML at all. (safest) +* `renderAsIs`: Renders the tag as is. +* `renderWrapped`: Renders the tag wrapped in an `htmltag`-Tag (this is to allow XML conversion) + +## License +MIT + +## Development +This package is not fully tested or developed yet. Partially because the underlying library from Apple is not fully released yet either. But this may be a great starting point for your own implementation. + +## Usage +This package is used by [caching.guru](https://caching.guru) in production. diff --git a/Sources/String+Markdown.swift b/Sources/String+Markdown.swift new file mode 100644 index 0000000..5052068 --- /dev/null +++ b/Sources/String+Markdown.swift @@ -0,0 +1,213 @@ +// +// File.swift +// +// +// Created by Ralph Küpper on 2/15/23. +// + +import Foundation +import Markdown +import SwiftSoup + +public extension String { + struct MarkdownHtmlConfig { + enum HTMLTagConfig { + case hide + case renderAsIs + case renderWrapped + } + var renderHtmlTags: HTMLTagConfig + + public static var defaultConfig = MarkdownHtmlConfig(renderHtmlTags: .renderWrapped) + } + func renderMarkdownToXML(_ config:MarkdownHtmlConfig = .defaultConfig) -> String { + let document = Document(parsing: self) + return self.renderChildXML(document, config: config) + } + private func renderChildXML(_ p: Markup, config: MarkdownHtmlConfig) -> String { + var ret = "" + if let para = p as? Paragraph { + ret = "

" + } + else if let para = p as? Markdown.Document { + // nothing to do + } + else if let text = p as? Text { + ret = ret + text.plainText + } + else if let break1 = p as? SoftBreak { + ret = ret + "
" + } + else if let ul = p as? UnorderedList { + ret = ret + "

    " + } + else if let ol = p as? OrderedList { + ret = ret + "
      " + } + else if let li = p as? ListItem { + ret = ret + "
    1. " + } + else if let strong = p as? Strong { + ret = ret + "" + } + else if let strikethrough = p as? Strikethrough { + ret = ret + "" + } + else if let blockQuote = p as? BlockQuote { + ret = ret + "
      " + } + else if let thematicBreak = p as? ThematicBreak { + ret = ret + "
      " + } + else if let table = p as? Table { + ret = ret + "" + } + else if let tableHead = p as? Table.Head { + ret = ret + "" + } + else if let tableBody = p as? Table.Body { + ret = ret + "" + } + else if let tableRow = p as? Table.Row { + ret = ret + "" + } + else if let tableCell = p as? Table.Cell { + ret = ret + "
      " + } + else if let html = p as? InlineHTML { + switch config.renderHtmlTags { + case .hide: + return ret + case .renderAsIs: + ret = ret + "\(html.rawHTML)" + case .renderWrapped: + ret = ret + "\(html.rawHTML)" + } + + } + else if let ul = p as? Emphasis { + ret = ret + "" + } else if let inlineCode = p as? InlineCode { + ret = ret + "" + } else if let link = p as? Link, let d = link.destination { + ret = ret + "" + } else if let image = p as? Image, let source = image.source { + if let title = image.title { + ret = ret + "" + } else { + ret = ret + "" + } + return ret + } else if let codeBlock = p as? CodeBlock { + if codeBlock.language == "box" { + ret = ret + "
      " + } else if codeBlock.language == "info" { + ret = ret + "
      " + } else if codeBlock.language == "url" { + ret = ret + "
      " + } else if let language = codeBlock.language { + ret = ret + "
      "
+            }
+            let c = Document(parsing: codeBlock.code)
+            ret = ret + self.renderChildXML(c, config: config)
+        } else if let h = p as? Heading {
+            if h.level == 1 {
+                ret = ret + "
      "
+            } else if h.level == 2 {
+                ret = ret + "
      "
+            } else if h.level == 3 {
+                ret = ret + "
      "
+            } else if h.level == 4 {
+                ret = ret + "
      "
+            } else if h.level == 5 {
+                ret = ret + "
      "
+            } else if h.level == 6 {
+                ret = ret + "
      "
+            }
+        }
+        else {
+            // In a final product we would not need this.
+            // As the markdown library has not released any official releases yet
+            // I'll leave it in until we know thre won't be any more.
+            // PR's welcome
+            #if DEBUG
+                print("unkown element1: ", type(of: p))
+            #endif
+        }
+        
+        for c in p.children {
+            ret = ret + self.renderChildXML(c, config: config)
+        }
+
+        if let h = p as? Heading {
+            if h.level == 1 {
+                ret = ret + "
      "
+            } else if h.level == 2 {
+                ret = ret + ""
+            } else if h.level == 3 {
+                ret = ret + ""
+            } else if h.level == 4 {
+                ret = ret + ""
+            } else if h.level == 5 {
+                ret = ret + ""
+            } else if h.level == 6 {
+                ret = ret + ""
+            }
+        }
+        else if let link = p as? Link {
+            ret = ret + "      "
+        }
+        else if let codeBlock = p as? CodeBlock {
+            if ["box", "info", "url"].contains(codeBlock.language) {
+                ret = ret + "
      " + } else { + ret = ret + "" + } + } + else if let li = p as? ListItem { + ret = ret + "" + } + else if let inlindeCode = p as? InlineCode { + ret = ret + "      " + } + else if let strong = p as? Strong { + ret = ret + "" + } + else if let i = p as? Emphasis { + ret = ret + "      " + } + else if let blockQuote = p as? BlockQuote { + ret = ret + "" + } + else if let strikethrough = p as? Strikethrough { + ret = ret + "" + } + else if let ul = p as? UnorderedList { + ret = ret + "" + } + else if let ol = p as? OrderedList { + ret = ret + "" + } + else if let table = p as? Table { + ret = ret + "
      " + } + else if let tableHead = p as? Table.Head { + ret = ret + "" + } + else if let tableBody = p as? Table.Body { + ret = ret + "" + } + else if let tableRow = p as? Table.Row { + ret = ret + "" + } + else if let tableCell = p as? Table.Cell { + ret = ret + "" + } + else if let para = p as? Paragraph { + ret = ret + "

      " + } + return ret + } + +} + diff --git a/Tests/MarkdownHtmlTests/MarkdownTest.swift b/Tests/MarkdownHtmlTests/MarkdownTest.swift new file mode 100644 index 0000000..597a08c --- /dev/null +++ b/Tests/MarkdownHtmlTests/MarkdownTest.swift @@ -0,0 +1,281 @@ +// +// MarkdownTest.swift +// MarkdownHtml +// +// Created by Ralph Kuepper on 02/15/23. +// Copyright © 2023 Ralph Kuepper. All rights reserved. +// + +import XCTest +@testable import MarkdownHtml + + + +class MarkdownTest: XCTestCase { + + + func testHeadlines() { + XCTAssertEqual("

      h1 headline

      ", "# h1 headline".renderMarkdownToXML()) + XCTAssertEqual("

      h2 headline

      ", "## h2 headline".renderMarkdownToXML()) + XCTAssertEqual("

      h3 headline

      ", "### h3 headline".renderMarkdownToXML()) + XCTAssertEqual("

      h4 headline

      ", "#### h4 headline".renderMarkdownToXML()) + XCTAssertEqual("
      h5 headline
      ", "##### h5 headline".renderMarkdownToXML()) + XCTAssertEqual("
      h6 headline
      ", "###### h6 headline".renderMarkdownToXML()) + XCTAssertEqual("

      Alt-H1

      ", """ + Alt-H1 + ====== + """.renderMarkdownToXML()) + XCTAssertEqual("

      Alt-H2

      ", """ + Alt-H2 + ------ + """.renderMarkdownToXML()) + XCTAssertEqual("
      h6 headline
      ", "###### h6 headline".renderMarkdownToXML()) + + + + } + + func testTexts() { + XCTAssertEqual("

      Emphasis, aka italics, with asterisks or underscores.

      ", "Emphasis, aka italics, with *asterisks* or _underscores_.".renderMarkdownToXML()) + XCTAssertEqual("

      Strong emphasis, aka bold, with asterisks or underscores.

      ", "Strong emphasis, aka bold, with **asterisks** or __underscores__.".renderMarkdownToXML()) + XCTAssertEqual("

      Combined emphasis with asterisks and underscores.

      ", "Combined emphasis with **asterisks and _underscores_**.".renderMarkdownToXML()) + XCTAssertEqual("

      Scratch this.

      ", "~~Scratch this.~~".renderMarkdownToXML()) + XCTAssertEqual("

      This is bold text

      ", "**This is bold text**".renderMarkdownToXML()) + XCTAssertEqual("

      This is bold text

      ", "__This is bold text__".renderMarkdownToXML()) + + XCTAssertEqual("

      This is italic text

      ", "*This is italic text*".renderMarkdownToXML()) + XCTAssertEqual("

      This is italic text

      ", "_This is italic text_".renderMarkdownToXML()) + XCTAssertEqual("

      Strikethrough

      ", "~~Strikethrough~~".renderMarkdownToXML()) + XCTAssertEqual("

      1. First ordered list item

      2. Another item

      ", """ +1. First ordered list item +2. Another item +""".renderMarkdownToXML()) + XCTAssertEqual("

      • Unordered sub-list.

      • And another item.

      ", """ + * Unordered sub-list. + * And another item. + """.renderMarkdownToXML()) + + XCTAssertEqual("

      regular text

      ", "regular text".renderMarkdownToXML()) + + } + + func testLargeMarkdown() { + let markdownTest = """ + # h1 Heading 8-) + ## h2 Heading + ### h3 Heading + #### h4 Heading + ##### h5 Heading + ###### h6 Heading + + Alternatively, for H1 and H2, an underline-ish style: + + Alt-H1 + ====== + + Alt-H2 + ------ + + Emphasis, aka italics, with *asterisks* or _underscores_. + + Strong emphasis, aka bold, with **asterisks** or __underscores__. + + Combined emphasis with **asterisks and _underscores_**. + + Strikethrough uses two tildes. ~~Scratch this.~~ + + **This is bold text** + + __This is bold text__ + + *This is italic text* + + _This is italic text_ + + ~~Strikethrough~~ + + 1. First ordered list item + 2. Another item + * Unordered sub-list. + * And another item. + + ⋅⋅⋅You can have properly indented paragraphs within list items. Notice the blank line above, and the leading spaces (at least one, but we'll use three here to also align the raw Markdown). + + ⋅⋅⋅To have a line break without a paragraph, you will need to use two trailing spaces.⋅⋅ + ⋅⋅⋅Note that this line is separate, but within the same paragraph.⋅⋅ + ⋅⋅⋅(This is contrary to the typical GFM line break behaviour, where trailing spaces are not required.) + + * Unordered list can use asterisks + - Or minuses + + Or pluses + + 1. Make my changes + 1. Fix bug + 2. Improve formatting + - Make the headings bigger + 2. Push my commits to GitHub + 3. Open a pull request + * Describe my changes + * Mention all the members of my team + * Ask for feedback + + + Create a list by starting a line with `+`, `-`, or `*` + + Sub-lists are made by indenting 2 spaces: + - Marker character change forces new list start: + * Ac tristique libero volutpat at + + Facilisis in pretium nisl aliquet + - Nulla volutpat aliquam velit + + Very easy! + + - [x] Finish my changes + - [ ] Push my commits to GitHub + - [ ] Open a pull request + - [x] @mentions, #refs, [links](), **formatting**, and tags supported + - [x] list syntax required (any unordered or ordered list supported) + - [x] this is a complete item + - [ ] this is an incomplete item + + [I'm an inline-style link](https://www.google.com) + + [I'm an inline-style link with title](https://www.google.com "Google's Homepage") + + [I'm a reference-style link][Arbitrary case-insensitive reference text] + + [I'm a relative reference to a repository file](../blob/master/LICENSE) + + [You can use numbers for reference-style link definitions][1] + + Or leave it empty and use the [link text itself]. + + URLs and URLs in angle brackets will automatically get turned into links. + http://www.example.com or and sometimes + example.com (but not on Github, for example). + + Some text to show that the reference links can follow later. + + [arbitrary case-insensitive reference text]: https://www.mozilla.org + [1]: http://slashdot.org + [link text itself]: http://www.reddit.com + + Here's our logo (hover to see the title text): + + Inline-style: + ![alt text](https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "Logo Title Text 1") + + Reference-style: + ![alt text][logo] + + [logo]: https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "Logo Title Text 2" + + ![Minion](https://octodex.github.com/images/minion.png) + ![Stormtroopocat](https://octodex.github.com/images/stormtroopocat.jpg "The Stormtroopocat") + + Like links, Images also have a footnote style syntax + + ![Alt text][id] + + With a reference later in the document defining the URL location: + + [id]: https://octodex.github.com/images/dojocat.jpg "The Dojocat" + + Footnote 1 link[^first]. + + Footnote 2 link[^second]. + + Inline footnote^[Text of inline footnote] definition. + + Duplicated footnote reference[^second]. + + [^first]: Footnote **can have markup** + + and multiple paragraphs. + + [^second]: Footnote text. + + Colons can be used to align columns. + + | Tables | Are | Cool | + | ------------- |:-------------:| -----:| + | col 3 is | right-aligned | $1600 | + | col 2 is | centered | $12 | + | zebra stripes | are neat | $1 | + + There must be at least 3 dashes separating each header cell. + The outer pipes (|) are optional, and you don't need to make the + raw Markdown line up prettily. You can also use inline Markdown. + + Markdown | Less | Pretty + --- | --- | --- + *Still* | `renders` | **nicely** + 1 | 2 | 3 + + | First Header | Second Header | + | ------------- | ------------- | + | Content Cell | Content Cell | + | Content Cell | Content Cell | + + | Command | Description | + | --- | --- | + | git status | List all new or modified files | + | git diff | Show file differences that haven't been staged | + + | Command | Description | + | --- | --- | + | `git status` | List all *new or modified* files | + | `git diff` | Show file differences that **haven't been** staged | + + | Left-aligned | Center-aligned | Right-aligned | + | :--- | :---: | ---: | + | git status | git status | git status | + | git diff | git diff | git diff | + + | Name | Character | + | --- | --- | + | Backtick | ` | + + + > Blockquotes are very handy in email to emulate reply text. + > This line is part of the same quote. + + Quote break. + + > This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote. + + > Blockquotes can also be nested... + >> ...by using additional greater-than signs right next to each other... + > > > ...or with spaces between arrows. + + + ```javascript + + console.log("this is now english but should also stay english"); + ``` + + `this inline code should stay the same too` + + Three or more... + + --- + + Hyphens + + *** + + Asterisks + + ___ + + Underscores + + [![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/YOUTUBE_VIDEO_ID_HERE/0.jpg)](http://www.youtube.com/watch?v=YOUTUBE_VIDEO_ID_HERE) + + Finish + + """ + let res = markdownTest.renderMarkdownToXML() + XCTAssert(res.count>100) + } + + +} +