1# Copyright 2016-2023 The Khronos Group Inc. 2# 3# SPDX-License-Identifier: Apache-2.0 4 5require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal' 6 7include ::Asciidoctor 8 9class ReplaceMathjaxWithKatex < Extensions::Postprocessor 10 11 MathJaXScript = /<script type="text\/x-mathjax-config">((?!<\/script>).)+<\/script>/m 12 MathJaXCDN = /<script src="https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjax\/[0-9].[0-9].[0-9]\/MathJax.js\?config=[-_A-Za-z]+"><\/script>/m 13 14 def process document, output 15 16 if document.attr? 'stem' 17 katexpath = document.attr 'katexpath' 18 19 katexScript = ' 20<!-- dragged in by font-awesome css included by asciidoctor, but preloaded in this extension for convenience --> 21<link rel="preload" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0" as="font" type="font/woff2" crossorigin=""> 22 23<!-- Note: Chrome needs crossorigin="" even for same-origin fonts --> 24<link rel="preload" href="../katex/fonts/KaTeX_Main-Bold.woff2" as="font" type="font/woff2" crossorigin=""> 25<link rel="preload" href="../katex/fonts/KaTeX_Main-Italic.woff2" as="font" type="font/woff2" crossorigin=""> 26<link rel="preload" href="../katex/fonts/KaTeX_Main-Regular.woff2" as="font" type="font/woff2" crossorigin=""> 27<link rel="preload" href="../katex/fonts/KaTeX_Math-Italic.woff2" as="font" type="font/woff2" crossorigin=""> 28<link rel="preload" href="../katex/fonts/KaTeX_Size1-Regular.woff2" as="font" type="font/woff2" crossorigin=""> 29<link rel="preload" href="../katex/fonts/KaTeX_Size2-Regular.woff2" as="font" type="font/woff2" crossorigin=""> 30<link rel="preload" href="../katex/fonts/KaTeX_Size3-Regular.woff2" as="font" type="font/woff2" crossorigin=""> 31<link rel="preload" href="../katex/fonts/KaTeX_Size4-Regular.woff2" as="font" type="font/woff2" crossorigin=""> 32<link rel="preload" href="../katex/fonts/KaTeX_Typewriter-Regular.woff2" as="font" type="font/woff2" crossorigin="">' 33 34 # Load KaTeX stylesheet, but we no longer run a script to convert math 35 # using KaTeX, since that is now done at spec generation time. 36 katexScript += '<link rel="stylesheet" href="' + katexpath + '/katex.min.css">' 37 38 output.sub! MathJaXScript, '' 39 output.sub! MathJaXCDN, '' 40 output.sub! /(?=<\/head>)/, katexScript 41 end 42 output 43 end 44end 45