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import { bundledLanguages, getHighlighter } from 'shikiji';
import { visit } from 'unist-util-visit';
import type { ShikiConfig } from './types.js';
export interface ShikiHighlighter {
highlight(code: string, lang?: string, options?: { inline?: boolean }): string;
}
const ASTRO_COLOR_REPLACEMENTS: Record<string, string> = {
'#000001': 'var(--astro-code-color-text)',
'#000002': 'var(--astro-code-color-background)',
'#000004': 'var(--astro-code-token-constant)',
'#000005': 'var(--astro-code-token-string)',
'#000006': 'var(--astro-code-token-comment)',
'#000007': 'var(--astro-code-token-keyword)',
'#000008': 'var(--astro-code-token-parameter)',
'#000009': 'var(--astro-code-token-function)',
'#000010': 'var(--astro-code-token-string-expression)',
'#000011': 'var(--astro-code-token-punctuation)',
'#000012': 'var(--astro-code-token-link)',
};
const COLOR_REPLACEMENT_REGEX = new RegExp(
`(${Object.keys(ASTRO_COLOR_REPLACEMENTS).join('|')})`,
'g'
);
export async function createShikiHighlighter({
langs = [],
theme = 'github-dark',
experimentalThemes = {},
wrap = false,
}: ShikiConfig = {}): Promise<ShikiHighlighter> {
const themes = experimentalThemes;
const highlighter = await getHighlighter({
langs: langs.length ? langs : Object.keys(bundledLanguages),
themes: Object.values(themes).length ? Object.values(themes) : [theme],
});
const loadedLanguages = highlighter.getLoadedLanguages();
return {
highlight(code, lang = 'plaintext', options) {
if (lang !== 'plaintext' && !loadedLanguages.includes(lang)) {
// eslint-disable-next-line no-console
console.warn(`[Shiki] The language "${lang}" doesn't exist, falling back to "plaintext".`);
lang = 'plaintext';
}
const themeOptions = Object.values(themes).length ? { themes } : { theme };
const inline = options?.inline ?? false;
return highlighter.codeToHtml(code, {
...themeOptions,
lang,
transforms: {
pre(node) {
// Swap to `code` tag if inline
if (inline) {
node.tagName = 'code';
}
// Cast to string as shikiji will always pass them as strings instead of any other types
const classValue = (node.properties.class as string) ?? '';
const styleValue = (node.properties.style as string) ?? '';
// Replace "shiki" class naming with "astro-code"
node.properties.class = classValue.replace(/shiki/g, 'astro-code');
// Handle code wrapping
// if wrap=null, do nothing.
if (wrap === false) {
node.properties.style = styleValue + '; overflow-x: auto;';
} else if (wrap === true) {
node.properties.style =
styleValue + '; overflow-x: auto; white-space: pre-wrap; word-wrap: break-word;';
}
},
line(node) {
// Add "user-select: none;" for "+"/"-" diff symbols.
// Transform `<span class="line"><span style="...">+ something</span></span>
// into `<span class="line"><span style="..."><span style="user-select: none;">+</span> something</span></span>`
if (lang === 'diff') {
const innerSpanNode = node.children[0];
const innerSpanTextNode =
innerSpanNode?.type === 'element' && innerSpanNode.children?.[0];
if (innerSpanTextNode && innerSpanTextNode.type === 'text') {
const start = innerSpanTextNode.value[0];
if (start === '+' || start === '-') {
innerSpanTextNode.value = innerSpanTextNode.value.slice(1);
innerSpanNode.children.unshift({
type: 'element',
tagName: 'span',
properties: { style: 'user-select: none;' },
children: [{ type: 'text', value: start }],
});
}
}
}
},
code(node) {
if (inline) {
return node.children[0] as typeof node;
}
},
root(node) {
if (Object.values(experimentalThemes).length) {
return;
}
// theme.id for shiki -> shikiji compat
const themeName = typeof theme === 'string' ? theme : theme.name;
if (themeName === 'css-variables') {
// Replace special color tokens to CSS variables
visit(node as any, 'element', (child) => {
if (child.properties?.style) {
child.properties.style = replaceCssVariables(child.properties.style);
}
});
}
},
},
});
},
};
}
/**
* shiki -> shikiji compat as we need to manually replace it
* @internal Exported for error overlay use only
*/
export function replaceCssVariables(str: string) {
return str.replace(COLOR_REPLACEMENT_REGEX, (match) => ASTRO_COLOR_REPLACEMENTS[match] || match);
}
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