1e532a6c4c
Now that we’re making Splash support iOS as well as Mac + Linux, we need to create some nice abstractions to make sure that we can share as much code as possible between all platforms. - Define Font.Loaded and Color.Renderable as platform- specific typealiases for system fonts and colors. - Don’t compile in non-Linux compatible code when building for Linux. - Make Font and Color handle all conversion themselves, so that AttributedStringOutputFormat can be kept more clean.
68 lines
1.9 KiB
Swift
68 lines
1.9 KiB
Swift
/**
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* Splash
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* Copyright (c) John Sundell 2018
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* MIT license - see LICENSE.md
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*/
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#if !os(Linux)
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import Foundation
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/// Output format to use to generate an NSAttributedString from the
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/// highlighted code. A `Theme` is used to determine what fonts and
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/// colors to use for the various tokens.
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public struct AttributedStringOutputFormat: OutputFormat {
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public var theme: Theme
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public init(theme: Theme) {
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self.theme = theme
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}
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public func makeBuilder() -> Builder {
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return Builder(theme: theme)
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}
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}
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public extension AttributedStringOutputFormat {
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struct Builder: OutputBuilder {
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private let theme: Theme
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private lazy var font = theme.font.load()
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private var string = NSMutableAttributedString()
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fileprivate init(theme: Theme) {
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self.theme = theme
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}
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public mutating func addToken(_ token: String, ofType type: TokenType) {
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let color = theme.tokenColors[type] ?? Color(red: 1, green: 1, blue: 1)
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string.append(token, font: font, color: color)
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}
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public mutating func addPlainText(_ text: String) {
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string.append(text, font: font, color: theme.plainTextColor)
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}
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public mutating func addWhitespace(_ whitespace: String) {
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let color = Color(red: 1, green: 1, blue: 1)
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string.append(whitespace, font: font, color: color)
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}
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public func build() -> NSAttributedString {
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return NSAttributedString(attributedString: string)
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}
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}
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}
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private extension NSMutableAttributedString {
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func append(_ string: String, font: Font.Loaded, color: Color) {
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let attributedString = NSAttributedString(string: string, attributes: [
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.foregroundColor: color.renderable,
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.font: font
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])
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append(attributedString)
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}
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}
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#endif
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