mirror of https://github.com/lukechilds/damus.git
William Casarin
2 years ago
6 changed files with 102 additions and 16 deletions
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// |
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// Markdown.swift |
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// damus |
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// |
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// Created by Lionello Lunesu on 2022-12-28. |
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// |
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import Foundation |
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public struct Markdown { |
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private let detector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) |
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/// Ensure the specified URL has a scheme by prepending "https://" if it's absent. |
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static func withScheme(_ url: any StringProtocol) -> any StringProtocol { |
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return url.contains("://") ? url : "https://" + url |
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} |
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public static func parse(content: String) -> AttributedString { |
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// Similar to the parsing in NoteContentView |
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let md_opts: AttributedString.MarkdownParsingOptions = |
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.init(interpretedSyntax: .inlineOnlyPreservingWhitespace) |
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if let txt = try? AttributedString(markdown: content, options: md_opts) { |
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return txt |
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} else { |
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return AttributedString(stringLiteral: content) |
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} |
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} |
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/// Process the input text and add markdown for any embedded URLs. |
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public func process(_ input: String) -> AttributedString { |
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let matches = detector.matches(in: input, options: [], range: NSRange(location: 0, length: input.utf16.count)) |
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var output = input |
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// Start with the last match, because replacing the first would invalidate all subsequent indices |
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for match in matches.reversed() { |
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guard let range = Range(match.range, in: input) else { continue } |
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let url = input[range] |
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output.replaceSubrange(range, with: "[\(url)](\(Markdown.withScheme(url)))") |
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} |
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// TODO: escape unintentional markdown |
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return Markdown.parse(content: output) |
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} |
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} |
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// |
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// MarkdownTests.swift |
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// damusTests |
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// |
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// Created by Lionello Lunesu on 2022-12-28. |
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// |
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import XCTest |
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@testable import damus |
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class MarkdownTests: XCTestCase { |
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let md_opts: AttributedString.MarkdownParsingOptions = |
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.init(interpretedSyntax: .inlineOnlyPreservingWhitespace) |
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override func setUpWithError() throws { |
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// Put setup code here. This method is called before the invocation of each test method in the class. |
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} |
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override func tearDownWithError() throws { |
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// Put teardown code here. This method is called after the invocation of each test method in the class. |
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} |
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func test_convert_link() throws { |
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let helper = Markdown() |
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let md = helper.process("prologue https://nostr.build epilogue") |
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let expected = try AttributedString(markdown: "prologue [https://nostr.build](https://nostr.build) epilogue", options: md_opts) |
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XCTAssertEqual(md, expected) |
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} |
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func test_convert_link_no_scheme() throws { |
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let helper = Markdown() |
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let md = helper.process("prologue damus.io epilogue") |
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let expected = try AttributedString(markdown: "prologue [damus.io](https://damus.io) epilogue", options: md_opts) |
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XCTAssertEqual(md, expected) |
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} |
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func test_convert_links() throws { |
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let helper = Markdown() |
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let md = helper.process("prologue damus.io https://nostr.build epilogue") |
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let expected = try AttributedString(markdown: "prologue [damus.io](https://damus.io) [https://nostr.build](https://nostr.build) epilogue", options: md_opts) |
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XCTAssertEqual(md, expected) |
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} |
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} |
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