# Copyright 2016-2023 The Khronos Group Inc. # # SPDX-License-Identifier: Apache-2.0 require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal' include ::Asciidoctor class ReplaceMathjaxWithKatex < Extensions::Postprocessor MathJaXScript = /<script type="text\/x-mathjax-config">((?!<\/script>).)+<\/script>/m MathJaXCDN = /<script src="https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjax\/[0-9].[0-9].[0-9]\/MathJax.js\?config=[-_A-Za-z]+"><\/script>/m def process document, output if document.attr? 'stem' katexpath = document.attr 'katexpath' katexScript = ' <!-- dragged in by font-awesome css included by asciidoctor, but preloaded in this extension for convenience --> <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=""> <!-- Note: Chrome needs crossorigin="" even for same-origin fonts --> <link rel="preload" href="../katex/fonts/KaTeX_Main-Bold.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Main-Italic.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Main-Regular.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Math-Italic.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Size1-Regular.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Size2-Regular.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Size3-Regular.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Size4-Regular.woff2" as="font" type="font/woff2" crossorigin=""> <link rel="preload" href="../katex/fonts/KaTeX_Typewriter-Regular.woff2" as="font" type="font/woff2" crossorigin="">' # Load KaTeX stylesheet, but we no longer run a script to convert math # using KaTeX, since that is now done at spec generation time. katexScript += '<link rel="stylesheet" href="' + katexpath + '/katex.min.css">' output.sub! MathJaXScript, '' output.sub! MathJaXCDN, '' output.sub! /(?=<\/head>)/, katexScript end output end end