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//===--- AnsiColor.swift - ANSI formatting control codes ------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Provides ANSI support via Swift string interpolation.
//
//===----------------------------------------------------------------------===//
enum AnsiColor {
case normal
case black
case red
case green
case yellow
case blue
case magenta
case cyan
case white
case gray
case brightRed
case brightGreen
case brightYellow
case brightBlue
case brightMagenta
case brightCyan
case brightWhite
case rgb(r: Int, g: Int, b: Int)
case grayscale(Int)
var foregroundCode: String {
switch self {
case .normal: return "39"
case .black: return "30"
case .red: return "31"
case .green: return "32"
case .yellow: return "33"
case .blue: return "34"
case .cyan: return "35"
case .magenta: return "36"
case .white: return "37"
case .gray: return "90"
case .brightRed: return "91"
case .brightGreen: return "92"
case .brightYellow: return "93"
case .brightBlue: return "94"
case .brightCyan: return "95"
case .brightMagenta: return "96"
case .brightWhite: return "97"
case let .rgb(r, g, b):
let ndx = 16 + 36 * r + 6 * g + b
return "38;5;\(ndx)"
case let .grayscale(g):
let ndx = 232 + g
return "38;5;\(ndx)"
}
}
var backgroundCode: String {
switch self {
case .normal: return "49"
case .black: return "40"
case .red: return "41"
case .green: return "42"
case .yellow: return "43"
case .blue: return "44"
case .cyan: return "45"
case .magenta: return "46"
case .white: return "47"
case .gray: return "100"
case .brightRed: return "101"
case .brightGreen: return "102"
case .brightYellow: return "103"
case .brightBlue: return "104"
case .brightCyan: return "105"
case .brightMagenta: return "106"
case .brightWhite: return "107"
case let .rgb(r, g, b):
let ndx = 16 + 36 * r + 6 * g + b
return "48;5;\(ndx)"
case let .grayscale(g):
let ndx = 232 + g
return "48;5;\(ndx)"
}
}
}
enum AnsiWeight {
case normal
case bold
case faint
var code: String {
switch self {
case .normal: return "22"
case .bold: return "1"
case .faint: return "2"
}
}
}
enum AnsiAttribute {
case fg(AnsiColor)
case bg(AnsiColor)
case weight(AnsiWeight)
case inverse(Bool)
}
extension DefaultStringInterpolation {
mutating func appendInterpolation(ansi attrs: AnsiAttribute...) {
var code = "\u{1b}["
var first = true
for attr in attrs {
if first {
first = false
} else {
code += ";"
}
switch attr {
case let .fg(color):
code += color.foregroundCode
case let .bg(color):
code += color.backgroundCode
case let .weight(weight):
code += weight.code
case let .inverse(enabled):
if enabled {
code += "7"
} else {
code += "27"
}
}
}
code += "m"
appendInterpolation(code)
}
mutating func appendInterpolation(fg: AnsiColor) {
return appendInterpolation(ansi: .fg(fg))
}
mutating func appendInterpolation(bg: AnsiColor) {
return appendInterpolation(ansi: .bg(bg))
}
mutating func appendInterpolation(weight: AnsiWeight) {
return appendInterpolation(ansi: .weight(weight))
}
mutating func appendInterpolation(inverse: Bool) {
return appendInterpolation(ansi: .inverse(inverse))
}
}
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