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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| // | ||
| // MathJax+Extensions.swift | ||
| // LaTeXSwiftUI | ||
| // | ||
| // Copyright (c) 2023 Colin Campbell | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to | ||
| // deal in the Software without restriction, including without limitation the | ||
| // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| // sell copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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. | ||
| // | ||
|
|
||
| import Foundation | ||
| import MathJaxSwift | ||
|
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| internal extension MathJax { | ||
|
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| static var svgRenderer: MathJax? = { | ||
| do { | ||
| return try MathJax(preferredOutputFormat: .svg) | ||
| } | ||
| catch { | ||
| NSLog("Error creating MathJax instance: \(error)") | ||
| return nil | ||
| } | ||
| }() | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| // | ||
| // Cache.swift | ||
| // LaTeXSwiftUI | ||
| // | ||
| // Copyright (c) 2023 Colin Campbell | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to | ||
| // deal in the Software without restriction, including without limitation the | ||
| // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| // sell copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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. | ||
| // | ||
|
|
||
| import CryptoKit | ||
| import Foundation | ||
| import MathJaxSwift | ||
|
|
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| fileprivate protocol CacheKey: Codable { | ||
|
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| /// The key type used to identify the cache key in storage. | ||
| static var keyType: String { get } | ||
|
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| /// A key to use if encoding fails. | ||
| var fallbackKey: String { get } | ||
|
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| } | ||
|
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| extension CacheKey { | ||
|
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| /// The key to use in the cache. | ||
| func key() -> String { | ||
| do { | ||
| let data = try JSONEncoder().encode(self) | ||
| let hashedData = SHA256.hash(data: data) | ||
| return hashedData.compactMap { String(format: "%02x", $0) }.joined() + "-" + Self.keyType | ||
| } | ||
| catch { | ||
| return fallbackKey + "-" + Self.keyType | ||
| } | ||
| } | ||
|
|
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| } | ||
|
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| internal class Cache { | ||
|
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| // MARK: Types | ||
|
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| /// An SVG cache key. | ||
| struct SVGCacheKey: CacheKey { | ||
| static let keyType: String = "svg" | ||
| let componentText: String | ||
| let conversionOptions: ConversionOptions | ||
| let texOptions: TeXInputProcessorOptions | ||
| internal var fallbackKey: String { componentText } | ||
| } | ||
|
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| /// An image cache key. | ||
| struct ImageCacheKey: CacheKey { | ||
| static let keyType: String = "image" | ||
| let svg: SVG | ||
| let xHeight: CGFloat | ||
| internal var fallbackKey: String { String(data: svg.data, encoding: .utf8) ?? "" } | ||
| } | ||
|
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| // MARK: Static properties | ||
|
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| /// The shared cache. | ||
| static let shared = Cache() | ||
|
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| // MARK: Public properties | ||
|
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| /// The renderer's data cache. | ||
| let dataCache: NSCache<NSString, NSData> = NSCache() | ||
|
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| /// The renderer's image cache. | ||
| let imageCache: NSCache<NSString, _Image> = NSCache() | ||
|
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| // MARK: Private properties | ||
|
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| /// Semaphore for thread-safe access to `dataCache`. | ||
| let dataCacheSemaphore = DispatchSemaphore(value: 1) | ||
|
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| /// Semaphore for thread-safe access to `imageCache`. | ||
| let imageCacheSemaphore = DispatchSemaphore(value: 1) | ||
|
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| } | ||
|
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| // MARK: Public methods | ||
|
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| extension Cache { | ||
|
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| /// Safely access the cache value for the given key. | ||
| /// | ||
| /// - Parameter key: The key of the value to get. | ||
| /// - Returns: A value. | ||
| func dataCacheValue(for key: SVGCacheKey) -> Data? { | ||
| dataCacheSemaphore.wait() | ||
| defer { dataCacheSemaphore.signal() } | ||
| return dataCache.object(forKey: key.key() as NSString) as Data? | ||
| } | ||
|
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| /// Safely sets the cache value. | ||
| /// | ||
| /// - Parameters: | ||
| /// - value: The value to set. | ||
| /// - key: The value's key. | ||
| func setDataCacheValue(_ value: Data, for key: SVGCacheKey) { | ||
| dataCacheSemaphore.wait() | ||
| dataCache.setObject(value as NSData, forKey: key.key() as NSString) | ||
| dataCacheSemaphore.signal() | ||
| } | ||
|
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| /// Safely access the cache value for the given key. | ||
| /// | ||
| /// - Parameter key: The key of the value to get. | ||
| /// - Returns: A value. | ||
| func imageCacheValue(for key: ImageCacheKey) -> _Image? { | ||
| imageCacheSemaphore.wait() | ||
| defer { imageCacheSemaphore.signal() } | ||
| return imageCache.object(forKey: key.key() as NSString) | ||
| } | ||
|
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| /// Safely sets the cache value. | ||
| /// | ||
| /// - Parameters: | ||
| /// - value: The value to set. | ||
| /// - key: The value's key. | ||
| func setImageCacheValue(_ value: _Image, for key: ImageCacheKey) { | ||
| imageCacheSemaphore.wait() | ||
| imageCache.setObject(value, forKey: key.key() as NSString) | ||
| imageCacheSemaphore.signal() | ||
| } | ||
|
|
||
| } |
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