File size: 5,316 Bytes
4e1096a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | import { ViewSettings } from '@/types/book';
import hljs from 'highlight.js/lib/common';
export const CODE_LANGUAGES = [
'auto-detect',
'bash',
'c',
'cpp',
'csharp',
'css',
'diff',
'go',
'graphql',
'ini',
'java',
'javascript',
'json',
'kotlin',
'less',
'lua',
'makefile',
'markdown',
'objectivec',
'perl',
'php',
'php-t',
'python',
'python-r',
'r',
'ruby',
'rust',
'scss',
'shell',
'sql',
'swift',
'typescript',
'vbnet',
'wasm',
'xml',
'yaml',
] as const;
export type CodeLanguage = (typeof CODE_LANGUAGES)[number];
/** Toggle on or off the highlightjs stylesheet from the DOM and add relevant language styles */
export const manageSyntaxHighlighting = (doc: Document, viewSettings: ViewSettings) => {
const styleId = 'highlight-js-theme-style'; // arbitrary css id
const { codeHighlighting, codeLanguage } = viewSettings;
const existingStyleElement = doc.getElementById(styleId);
if (existingStyleElement) {
existingStyleElement.remove();
}
if (!codeHighlighting) {
// If disabling, remove the stylesheet and applied classes
const styleElement = doc.getElementById(styleId);
if (styleElement) styleElement.remove();
doc.querySelectorAll('pre').forEach((block) => {
if ((block as HTMLElement).dataset['highlighted']) {
block.innerHTML = block.textContent || '';
}
});
return;
}
const style = doc.createElement('style');
style.id = styleId;
style.textContent = getHighlightJsStyles();
doc.head.appendChild(style);
// Find all <pre> elements in available content
const codeBlocks = doc.querySelectorAll('pre');
// https://github.com/highlightjs/highlight.js/wiki/security
// I believe this is valid in this use case to ignore this warning.
hljs.configure({ ignoreUnescapedHTML: true });
codeBlocks.forEach((block) => {
// remove any previously applied classes by hljs
block.innerHTML = block.textContent || '';
block.className = block.className.replace(/language-\S+/g, '');
block.classList.remove('hljs');
block.removeAttribute('data-highlighted');
if (codeLanguage && codeLanguage !== 'auto-detect') {
block.classList.add(`language-${codeLanguage}`);
}
hljs.highlightElement(block as HTMLElement);
});
};
/** Return either github light or dark theme */
const getHighlightJsStyles = () => {
// Potential improvement: add more themes following this pattern.
const githubLightTheme = `
pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}/*!
Theme: GitHub
Description: Light theme as seen on github.com
Author: github.com
Maintainer: @Hirse
Updated: 2021-05-15
Outdated base version: https://github.com/primer/github-syntax-light
Current colors taken from GitHub's CSS
*/.hljs{color:#24292e;background:#fff}.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-template-tag,.hljs-template-variable,.hljs-type,.hljs-variable.language_{color:#d73a49}.hljs-title,.hljs-title.class_,.hljs-title.class_.inherited__,.hljs-title.function_{color:#6f42c1}.hljs-attr,.hljs-attribute,.hljs-literal,.hljs-meta,.hljs-number,.hljs-operator,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-id,.hljs-variable{color:#005cc5}.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#032f62}.hljs-built_in,.hljs-symbol{color:#e36209}.hljs-code,.hljs-comment,.hljs-formula{color:#6a737d}.hljs-name,.hljs-quote,.hljs-selector-pseudo,.hljs-selector-tag{color:#22863a}.hljs-subst{color:#24292e}.hljs-section{color:#005cc5;font-weight:700}.hljs-bullet{color:#735c0f}.hljs-emphasis{color:#24292e;font-style:italic}.hljs-strong{color:#24292e;font-weight:700}.hljs-addition{color:#22863a;background-color:#f0fff4}.hljs-deletion{color:#b31d28;background-color:#ffeef0}
`;
const githubDarkTheme = `
@media (prefers-color-scheme: dark) {
pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}/*!
Theme: GitHub Dark
Description: Dark theme as seen on github.com
Author: github.com
Maintainer: @Hirse
Updated: 2021-05-15
Outdated base version: https://github.com/primer/github-syntax-dark
Current colors taken from GitHub's CSS
*/.hljs{color:#c9d1d9;background:#0d1117}.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-template-tag,.hljs-template-variable,.hljs-type,.hljs-variable.language_{color:#ff7b72}.hljs-title,.hljs-title.class_,.hljs-title.class_.inherited__,.hljs-title.function_{color:#d2a8ff}.hljs-attr,.hljs-attribute,.hljs-literal,.hljs-meta,.hljs-number,.hljs-operator,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-id,.hljs-variable{color:#79c0ff}.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#a5d6ff}.hljs-built_in,.hljs-symbol{color:#ffa657}.hljs-code,.hljs-comment,.hljs-formula{color:#8b949e}.hljs-name,.hljs-quote,.hljs-selector-pseudo,.hljs-selector-tag{color:#7ee787}.hljs-subst{color:#c9d1d9}.hljs-section{color:#1f6feb;font-weight:700}.hljs-bullet{color:#f2cc60}.hljs-emphasis{color:#c9d1d9;font-style:italic}.hljs-strong{color:#c9d1d9;font-weight:700}.hljs-addition{color:#aff5b4;background-color:#033a16}.hljs-deletion{color:#ffdcd7;background-color:#67060c}
}`;
const githubTheme = `${githubLightTheme}\n${githubDarkTheme}`;
return githubTheme;
};
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