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173 lines (146 loc) · 5.3 KB
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// <fe-search> — Client-side doc search with fuzzy matching.
//
// Queries window.FE_DOC_INDEX (set by the static doc site shell).
// Renders an input field and a dropdown of matching results.
/** Fuzzy match: checks if all chars of `query` appear in order in `candidate`.
* Returns a score (higher = tighter match) or -1 if no match. */
function _fuzzyScore(query, candidate) {
var qi = 0;
var score = 0;
var lastMatch = -1;
for (var ci = 0; ci < candidate.length && qi < query.length; ci++) {
if (candidate.charAt(ci) === query.charAt(qi)) {
// Bonus for consecutive matches
score += (lastMatch === ci - 1) ? 3 : 1;
// Bonus for matching at start or after separator
if (ci === 0 || candidate.charAt(ci - 1) === ":" || candidate.charAt(ci - 1) === "_") {
score += 2;
}
lastMatch = ci;
qi++;
}
}
return qi < query.length ? -1 : score;
}
class FeSearch extends HTMLElement {
connectedCallback() {
this._timer = null;
this.render();
}
disconnectedCallback() {
if (this._timer) clearTimeout(this._timer);
}
render() {
const container = document.createElement("div");
container.className = "fe-search-container";
const input = document.createElement("input");
input.type = "text";
input.className = "fe-search-input";
input.placeholder = "Search docs\u2026";
input.setAttribute("aria-label", "Search documentation");
const results = document.createElement("div");
results.className = "fe-search-results";
results.setAttribute("role", "listbox");
input.addEventListener("input", () => {
if (this._timer) clearTimeout(this._timer);
this._timer = setTimeout(() => this.search(input.value, results), 150);
});
container.appendChild(input);
container.appendChild(results);
this.appendChild(container);
}
search(query, resultsEl) {
resultsEl.innerHTML = "";
if (!query || query.length < 2) return;
// Try SCIP-powered search first
var scip = window.FE_SCIP;
if (scip) {
try {
var results = JSON.parse(scip.search(query));
// Drop results without a doc_url — they would render as unclickable
// links that land back on the current page. Users hate those.
var clickable = [];
for (var ck = 0; ck < results.length; ck++) {
if (results[ck].doc_url) clickable.push(results[ck]);
}
if (clickable.length > 0) {
for (var k = 0; k < clickable.length; k++) {
var r = clickable[k];
var a = document.createElement("a");
a.className = "search-result";
a.href = "#" + r.doc_url;
a.setAttribute("role", "option");
var badge = document.createElement("span");
badge.className = "kind-badge";
badge.textContent = this._scipKindName(r.kind);
var nameEl = document.createElement("span");
nameEl.textContent = r.display_name || "";
a.appendChild(badge);
a.appendChild(nameEl);
resultsEl.appendChild(a);
}
return;
}
} catch (_) {
// Fall through to DocIndex search
}
}
// Fallback: DocIndex search with fuzzy matching
var index = window.FE_DOC_INDEX;
if (!index || !index.items) return;
// kind -> URL suffix (mirrors fe-web.js ITEM_KIND_INFO)
var KIND_SUFFIX = {
module: "mod", function: "fn", struct: "struct", enum: "enum",
trait: "trait", contract: "contract", type_alias: "type",
const: "const", impl: "impl", impl_trait: "impl",
msg: "msg",
};
var q = query.toLowerCase();
var scored = [];
var items = index.items;
for (var i = 0; i < items.length; i++) {
var item = items[i];
var name = (item.name || "").toLowerCase();
var path = (item.path || "").toLowerCase();
// Try exact substring first (highest priority)
if (name.indexOf(q) !== -1) {
scored.push({ item: item, score: 1000 + (name === q ? 500 : 0) });
} else if (path.indexOf(q) !== -1) {
scored.push({ item: item, score: 500 });
} else {
// Fuzzy match on name
var fs = _fuzzyScore(q, name);
if (fs > 0) {
scored.push({ item: item, score: fs });
}
}
}
// Sort by score descending, take top 15
scored.sort(function (a, b) { return b.score - a.score; });
var matches = scored.slice(0, 15);
for (var j = 0; j < matches.length; j++) {
var m = matches[j].item;
var suffix = KIND_SUFFIX[m.kind] || m.kind;
var a = document.createElement("a");
a.className = "search-result";
a.href = "#" + m.path + "/" + suffix;
a.setAttribute("role", "option");
var badge = document.createElement("span");
badge.className = "kind-badge " + (m.kind || "").toLowerCase();
badge.textContent = m.kind || "";
var nameSpan = document.createElement("span");
nameSpan.textContent = m.name || "";
a.appendChild(badge);
a.appendChild(nameSpan);
resultsEl.appendChild(a);
}
}
_scipKindName(kind) {
var names = {
7: "class", 11: "enum", 12: "member", 15: "field",
17: "fn", 26: "method", 49: "struct", 53: "trait", 54: "type",
};
return names[kind] || "sym";
}
}
customElements.define("fe-search", FeSearch);