| 1 | import { FONT_FAMILIES, MONO_FONT_FAMILIES, type FontFamily, type MonoFontFamily } from "./fontFamily"; |
| 2 | |
| 3 | export type TypographyPlatform = "windows" | "darwin" | "linux"; |
| 4 | type FontProbe = (fontNames: readonly string[]) => boolean; |
| 5 | |
| 6 | const UI_FONT_CANDIDATES: Record<Exclude<FontFamily, "system" | "custom">, { platforms: TypographyPlatform[]; fonts: string[] }> = { |
| 7 | yahei: { |
| 8 | platforms: ["windows"], |
| 9 | fonts: ["Microsoft YaHei UI", "Microsoft YaHei", "微软雅黑"], |
| 10 | }, |
| 11 | pingfang: { |
| 12 | platforms: ["darwin"], |
| 13 | fonts: ["PingFang SC", "PingFang TC", "苹方-简"], |
| 14 | }, |
| 15 | noto: { |
| 16 | platforms: ["linux"], |
| 17 | fonts: ["Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", "思源黑体"], |
| 18 | }, |
| 19 | }; |
| 20 | |
| 21 | const MONO_FONT_CANDIDATES: Record<Exclude<MonoFontFamily, "system" | "custom">, { platforms: TypographyPlatform[]; fonts: string[] }> = { |
| 22 | cascadia: { |
| 23 | platforms: ["windows"], |
| 24 | fonts: ["Cascadia Code", "Cascadia Mono"], |
| 25 | }, |
| 26 | jetbrains: { |
| 27 | platforms: [], |
| 28 | fonts: ["JetBrains Mono"], |
| 29 | }, |
| 30 | sfmono: { |
| 31 | platforms: ["darwin"], |
| 32 | fonts: ["SF Mono", "SFMono-Regular"], |
| 33 | }, |
| 34 | }; |
| 35 | |
| 36 | export function getTypographyPlatform(): TypographyPlatform { |
| 37 | if (typeof document !== "undefined") { |
| 38 | const attr = document.documentElement.getAttribute("data-platform"); |
| 39 | if (attr === "windows" || attr === "darwin" || attr === "linux") return attr; |
| 40 | } |
| 41 | if (typeof navigator === "undefined") return "linux"; |
| 42 | const marker = `${navigator.platform} ${navigator.userAgent}`; |
| 43 | if (/Win/i.test(marker)) return "windows"; |
| 44 | if (/Mac/i.test(marker)) return "darwin"; |
| 45 | return "linux"; |
| 46 | } |
| 47 | |
| 48 | export function getAvailableFontFamilies( |
| 49 | selected: FontFamily, |
| 50 | platform: TypographyPlatform = getTypographyPlatform(), |
| 51 | probe: FontProbe = isAnyLocalFontAvailable, |
| 52 | ): FontFamily[] { |
| 53 | return FONT_FAMILIES.filter((font) => { |
| 54 | if (font === "system" || font === "custom" || font === selected) return true; |
| 55 | const meta = UI_FONT_CANDIDATES[font]; |
| 56 | return meta.platforms.includes(platform) || probe(meta.fonts); |
| 57 | }); |
| 58 | } |
| 59 | |
| 60 | export function getAvailableMonoFontFamilies( |
| 61 | selected: MonoFontFamily, |
| 62 | platform: TypographyPlatform = getTypographyPlatform(), |
| 63 | probe: FontProbe = isAnyLocalFontAvailable, |
| 64 | ): MonoFontFamily[] { |
| 65 | return MONO_FONT_FAMILIES.filter((font) => { |
| 66 | if (font === "system" || font === "custom" || font === selected) return true; |
| 67 | const meta = MONO_FONT_CANDIDATES[font]; |
| 68 | return meta.platforms.includes(platform) || probe(meta.fonts); |
| 69 | }); |
| 70 | } |
| 71 | |
| 72 | function isAnyLocalFontAvailable(fontNames: readonly string[]): boolean { |
| 73 | if (typeof document === "undefined") return false; |
| 74 | return fontNames.some((font) => isLocalFontAvailable(font)); |
| 75 | } |
| 76 | |
| 77 | function isLocalFontAvailable(fontName: string): boolean { |
| 78 | const canvas = document.createElement("canvas"); |
| 79 | const ctx = canvas.getContext("2d"); |
| 80 | if (!ctx) return false; |
| 81 | |
| 82 | const sample = "Reasonix 字体检测 0123456789"; |
| 83 | const size = "72px"; |
| 84 | const fallbacks = ["monospace", "serif", "sans-serif"] as const; |
| 85 | return fallbacks.some((fallback) => { |
| 86 | ctx.font = `${size} ${fallback}`; |
| 87 | const fallbackWidth = ctx.measureText(sample).width; |
| 88 | ctx.font = `${size} ${quoteFontName(fontName)}, ${fallback}`; |
| 89 | return Math.abs(ctx.measureText(sample).width - fallbackWidth) > 0.5; |
| 90 | }); |
| 91 | } |
| 92 | |
| 93 | function quoteFontName(name: string): string { |
| 94 | return `"${name.replace(/\\/g, "\\\\").replace(/"/g, '\\"')}"`; |
| 95 | } |
| 96 |