import { tokenize } from "./indexer.js";
function buildExcerpt(text, queryTokens, maxLength = 360) {
if (!text || typeof text !== "string") {
return "";
}
const lower = text.toLowerCase();
let hitIndex = -1;
for (const token of queryTokens) {
const idx = lower.indexOf(token);
if (idx >= 0 && (hitIndex === -1 || idx < hitIndex)) {
hitIndex = idx;
}
}
if (hitIndex === -1) {
return text.slice(0, maxLength).trim();
}
const start = Math.max(0, hitIndex - Math.floor(maxLength / 3));
const end = Math.min(text.length, start + maxLength);
return text.slice(start, end).trim();
}
function searchIndex(index, pages, query, limit = 5) {
const tokens = tokenize(query);
const scores = new Map();
for (const token of tokens) {
const postings = index.terms[token];
if (!postings) {
continue;
}
for (const [pageId, count] of Object.entries(postings)) {
const id = Number(pageId);
scores.set(id, (scores.get(id) || 0) + count);
}
}
const ranked = Array.from(scores.entries())
.map(([pageId, score]) => ({
pageId,
score,
page: pages[pageId],
}))
.sort((a, b) => b.score - a.score)
.slice(0, limit)
.map(({ pageId, page, score }) => {
const safePage = page || {};
const textForExcerpt =
typeof safePage.text === "string"
? safePage.text
: typeof safePage.excerpt === "string"
? safePage.excerpt
: "";
return {
pageId,
slug: safePage.slug,
title: safePage.title,
url: safePage.url,
score,
excerpt: buildExcerpt(textForExcerpt, tokens),
headings: safePage.headings || [],
};
});
return {
query,
tokens,
totalMatches: ranked.length,
results: ranked,
};
}
export { buildExcerpt, searchIndex };
