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// From: https://github.com/shikijs/shiki/blob/main/packages/transformers/src/transformers/meta-highlight-word.ts
// MIT License
import type { ShikiTransformer } from "shiki"
function parseMetaHighlightWords(meta: string): string[] {
if (!meta) return []
// Remove any title="..." or title='...' content first
const metaWithoutTitle = meta.replace(/title=(["'])(.*?)\1/g, "")
// https://regex101.com/r/BHS5fd/1
const match = Array.from(metaWithoutTitle.matchAll(/\/((?:\\.|[^/])+)\//g))
return (
match
// Escape backslashes
.map((v) => v[1].replace(/\\(.)/g, "$1"))
)
}
export interface TransformerMetaWordHighlightOptions {
/**
* Class for highlighted words
*
* @default 'highlighted-word'
*/
className?: string
}
/**
* Allow using `/word/` in the code snippet meta to mark highlighted words.
*/
export function transformerMetaWordHighlight(
options: TransformerMetaWordHighlightOptions = {},
): ShikiTransformer {
const { className = "highlighted-word" } = options
return {
name: "@shikijs/transformers:meta-word-highlight",
preprocess(code, options) {
if (!this.options.meta?.__raw) return
const words = parseMetaHighlightWords(this.options.meta.__raw)
options.decorations ||= []
for (const word of words) {
const indexes = findAllSubstringIndexes(code, word)
for (const index of indexes) {
options.decorations.push({
start: index,
end: index + word.length,
properties: {
class: className,
},
})
}
}
},
}
}
function findAllSubstringIndexes(str: string, substr: string): number[] {
const indexes = []
let i = -1
while ((i = str.indexOf(substr, i + 1)) !== -1) indexes.push(i)
return indexes
}
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