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import FlexSearch from "flexsearch";
export type Page = {
content: string;
slug: string;
title: string;
type: string;
};
export type Result = {
content: string[];
slug: string;
title: string;
type?: string;
};
let pages_index: FlexSearch.Index;
let pages: Page[];
export function create_pages_index(data: Page[]) {
pages_index = new FlexSearch.Index({ tokenize: "forward" });
data.forEach((page, i) => {
const item = `${page.title} ${page.content}`;
pages_index.add(i, item);
});
pages = data;
}
export function search_pages_index(search_term: string) {
const match = search_term.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
const results = pages_index.search(match);
return results
.map((index) => pages[index as number])
.map(({ slug, title, content, type }) => {
return {
slug,
title: replace_text_with_marker(title, match),
content: get_matches(content, match),
type
};
});
}
function replace_text_with_marker(text: string, match: string) {
const regex = new RegExp(match, "gi");
return text.replaceAll(
regex,
(match) => `<span class='mark'>${match}</span>`
);
}
function get_matches(text: string, search_term: string, limit = 1) {
const regex = new RegExp(search_term, "gi");
const indexes = [];
let matches = 0;
let match;
while ((match = regex.exec(text)) !== null && matches < limit) {
indexes.push(match.index);
matches++;
}
return indexes.map((index) => {
const start = index - 20;
const end = index + 80;
const excerpt = text.substring(start, end).trim();
return `...${replace_text_with_marker(excerpt, search_term)}...`;
});
}
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