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Preload fonts in use as per CSS definitions #765

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Merged
merged 4 commits into from
Mar 18, 2025
Merged

Preload fonts in use as per CSS definitions #765

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75dd9c8
Preload fonts in use as per CSS definitions
cotti Mar 18, 2025
e315a22
Adjust FontUriCache typing and stricten Regex
cotti Mar 18, 2025
109190e
Readjust link header ordering.
cotti Mar 18, 2025
ffd6740
Fix accessor to private.
cotti Mar 18, 2025
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39 changes: 39 additions & 0 deletions src/Elastic.Markdown/Helpers/Preloader.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,39 @@
// Licensed to Elasticsearch B.V under one or more agreements.
// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information

using System.Collections.Immutable;
using System.Diagnostics;
using System.Reflection;
using System.Text.RegularExpressions;

namespace Elastic.Markdown.Helpers;

public static partial class FontPreloader
{
private static IReadOnlyCollection<string>? FontUriCache = null!;

public static async Task<IReadOnlyCollection<string>> GetFontUrisAsync() => FontUriCache ??= await LoadFontUrisAsync();
private static async Task<IReadOnlyCollection<string>> LoadFontUrisAsync()
{
var cachedFontUris = new List<string>();
var assembly = Assembly.GetExecutingAssembly();
var stylesResourceName = assembly.GetManifestResourceNames().First(n => n.EndsWith("styles.css"));

using var cssFileStream = new StreamReader(assembly.GetManifestResourceStream(stylesResourceName)!);

var cssFile = await cssFileStream.ReadToEndAsync();
var matches = FontUriRegex().Matches(cssFile);

foreach (Match match in matches)
{
if (match.Success)
cachedFontUris.Add($"/_static/{match.Groups[1].Value}");
}
FontUriCache = cachedFontUris;
return FontUriCache;
}

[GeneratedRegex(@"url\([""']?([^""'\)]+?\.(woff2|ttf|otf))[""']?\)", RegexOptions.Multiline | RegexOptions.Compiled)]
private static partial Regex FontUriRegex();
}
7 changes: 6 additions & 1 deletion src/Elastic.Markdown/Slices/Layout/_Head.cshtml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,12 @@
@inherits RazorSlice<LayoutViewModel>
@using Elastic.Markdown.Helpers
<head>
<title>@Model.Title</title>
<link rel="stylesheet" type="text/css" href="@Model.Static("styles.css")"/>
@foreach (var fontFile in await FontPreloader.GetFontUrisAsync())
{
<link rel="preload" href="@fontFile" as="font" type="font/woff2" crossorigin>
}
<link rel="stylesheet preload" as="style" type="text/css" href="@Model.Static("styles.css")" crossorigin/>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
@await RenderPartialAsync(_Favicon.Create())
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