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General: Improve display of images (#100)
* Add helper functions for replacing markdown images * Fix upside down images and large height * Replace markdown images with preview
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // | ||
| // String+MarkdownImage.swift | ||
| // ArtemisCore | ||
| // | ||
| // Created by Anian Schleyer on 13.11.24. | ||
| // | ||
|
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| import Foundation | ||
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| public extension String { | ||
| /** | ||
| Surrounds markdown images with newlines to convert inline images into block images. | ||
| */ | ||
| public func surroundingMarkdownImagesWithNewlines() -> String { | ||
| modifyingMarkdownImagesOutsideStyledBlocks() | ||
| } | ||
|
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| /** | ||
| Replaces markdown images with a placeholder: [image 🏞️] | ||
| Used for notification previews. | ||
| */ | ||
| public func replacingMarkdownImages() -> String { | ||
| modifyingMarkdownImagesOutsideStyledBlocks(replaceWith: "[image 🏞️]") | ||
| } | ||
|
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| /** | ||
| Either replaces images in Markdown text with a given placeholder or surrounds them with newlines if no placeholder is given | ||
| */ | ||
| private func modifyingMarkdownImagesOutsideStyledBlocks(replaceWith: String? = nil) -> String { | ||
| // Regex for code blocks, references and images outside styled blocks | ||
| let codeBlockPattern = #"(```[\s\S]*?```|(?: {4}|\t)[^\n]*\n?)"# | ||
| let referencePattern = #"(^>.*(?:\n|$))+"# | ||
| let imagePattern = #"(?<!\*\*|\*|<ins>|`)(\!\[[^\]]*\]\([^)]*\))(?!\*\*|\*|</ins>|`)"# | ||
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| guard let codeBlockRegex = try? NSRegularExpression(pattern: codeBlockPattern, options: []), | ||
| let referenceRegex = try? NSRegularExpression(pattern: referencePattern, options: []), | ||
| let imageRegex = try? NSRegularExpression(pattern: imagePattern, options: []) else { | ||
| print("Failed to create regex for image replacements") | ||
| return self | ||
| } | ||
|
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| // Extract and replace code blocks with a placeholder | ||
| let codePlaceholder = UUID().uuidString | ||
| let referencePlaceholder = UUID().uuidString | ||
| var codeBlocks: [String] = [] | ||
| var references: [String] = [] | ||
| var withoutCodeBlocks = self | ||
|
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| var range = NSRange(withoutCodeBlocks.startIndex..<withoutCodeBlocks.endIndex, in: withoutCodeBlocks) | ||
| codeBlockRegex.enumerateMatches(in: withoutCodeBlocks, options: [], range: range) { match, _, _ in | ||
| if let matchRange = match?.range, let range = Range(matchRange, in: withoutCodeBlocks) { | ||
| let codeBlock = String(withoutCodeBlocks[range]) | ||
| codeBlocks.append(codeBlock) | ||
| withoutCodeBlocks.replaceSubrange(range, with: codePlaceholder) | ||
| } | ||
| } | ||
| range = NSRange(withoutCodeBlocks.startIndex..<withoutCodeBlocks.endIndex, in: withoutCodeBlocks) | ||
| referenceRegex.enumerateMatches(in: withoutCodeBlocks, options: [], range: range) { match, _, _ in | ||
| if let matchRange = match?.range, let range = Range(matchRange, in: withoutCodeBlocks) { | ||
| let reference = String(withoutCodeBlocks[range]) | ||
| references.append(reference) | ||
| withoutCodeBlocks.replaceSubrange(range, with: referencePlaceholder) | ||
| } | ||
| } | ||
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| // Surround images with newlines or replace them | ||
| range = NSRange(withoutCodeBlocks.startIndex..<withoutCodeBlocks.endIndex, in: withoutCodeBlocks) | ||
| let replacementPattern = replaceWith ?? "\n\n$1\n\n" | ||
| withoutCodeBlocks = imageRegex.stringByReplacingMatches(in: withoutCodeBlocks, options: [], range: range, withTemplate: replacementPattern) | ||
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| // Restore the code blocks in the processed text | ||
| var result = withoutCodeBlocks | ||
| for codeBlock in codeBlocks { | ||
| if let range = result.range(of: codePlaceholder) { | ||
| result.replaceSubrange(range, with: codeBlock) | ||
| } | ||
| } | ||
| for reference in references { | ||
| if let range = result.range(of: referencePlaceholder) { | ||
| result.replaceSubrange(range, with: reference) | ||
| } | ||
| } | ||
|
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| return result | ||
| } | ||
| } |
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