TripSense 行知 · 周边出行顾问：首版
零依赖 Node 服务，三步流程（选出发地 → 分析候选 → 生成方案 + 路线图 + 住宿参考）。 - 候选发现：高德 place/text 类型词跨城检索 + 内置景区/城市/小众库 + Photon 兜底 - 区县级「排除同城」判定（adname），过滤发生在轮转取样之前 - 路线图画的是 AI 方案里实际安排的每个地点，按正文顺序编号 + 虚线动线 + 真实高德底图 - 住宿：RollingGo 只读 CLI 取实时报价，无价格源时如实标注不编造 - 服务端内存缓存（指纹 + TTL + LRU），数据源层与 HTTP 层分别缓存 - 上下文瘦身：逐日天气只给 rank1，紧凑 JSON，实测约 1335 token
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'use strict';
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// ------------------------------------------------------------------ 通用工具
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const clamp = (v, lo, hi) => Math.min(hi, Math.max(lo, v));
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const round = (v, n = 0) => {
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const p = 10 ** n;
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return Math.round((Number(v) || 0) * p) / p;
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};
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/** 带超时的 fetch，返回原始 Response */
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async function fetchWithTimeout(url, opts = {}, timeoutMs = 15000) {
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const ctrl = new AbortController();
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const timer = setTimeout(() => ctrl.abort(), timeoutMs);
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try {
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return await fetch(url, { ...opts, signal: ctrl.signal });
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} finally {
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clearTimeout(timer);
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}
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}
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async function fetchJSON(url, opts = {}, timeoutMs = 15000, retries = 2) {
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let lastErr;
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for (let attempt = 0; attempt <= retries; attempt += 1) {
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try {
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const res = await fetchWithTimeout(url, opts, timeoutMs);
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if (!res.ok) {
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const text = await res.text().catch(() => '');
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// 4xx 是确定性错误，不必重试
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if (res.status >= 400 && res.status < 500) {
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throw new Error(`HTTP ${res.status} ${res.statusText} ${text.slice(0, 160)}`);
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}
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throw new Error(`HTTP ${res.status} ${res.statusText} ${text.slice(0, 160)}`);
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}
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return await res.json();
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} catch (err) {
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lastErr = err;
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if (attempt < retries) await new Promise((r) => setTimeout(r, 300 * (attempt + 1)));
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}
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}
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throw lastErr;
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}
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/** 并发限制的 map，失败不中断整体 */
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async function mapLimit(items, limit, fn) {
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const out = new Array(items.length);
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let cursor = 0;
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const workers = Array.from({ length: Math.min(limit, items.length) }, async () => {
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while (true) {
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const i = cursor++;
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if (i >= items.length) return;
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try {
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out[i] = await fn(items[i], i);
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} catch (err) {
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out[i] = null;
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console.warn(`[mapLimit] ${i} failed: ${err.message}`);
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}
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}
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});
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await Promise.all(workers);
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return out;
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}
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/** 安全地尝试，失败返回 fallback */
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async function attempt(label, fn, fallback) {
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try {
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return await fn();
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} catch (err) {
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console.warn(`[${label}] ${err.message}`);
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return typeof fallback === 'function' ? fallback(err) : fallback;
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}
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}
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// ------------------------------------------------------------------ 地理计算
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const R_EARTH = 6371;
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const toRad = (d) => (d * Math.PI) / 180;
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function haversine(lat1, lon1, lat2, lon2) {
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const dLat = toRad(lat2 - lat1);
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const dLon = toRad(lon2 - lon1);
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const a =
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Math.sin(dLat / 2) ** 2 +
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Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLon / 2) ** 2;
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return 2 * R_EARTH * Math.asin(Math.sqrt(a));
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}
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/** 方位角：0 = 正北，顺时针递增 */
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function bearing(lat1, lon1, lat2, lon2) {
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const p1 = toRad(lat1);
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const p2 = toRad(lat2);
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const dl = toRad(lon2 - lon1);
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const y = Math.sin(dl) * Math.cos(p2);
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const x = Math.cos(p1) * Math.sin(p2) - Math.sin(p1) * Math.cos(p2) * Math.cos(dl);
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return (Math.atan2(y, x) * 180) / Math.PI;
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}
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const COMPASS_8 = ['北', '东北', '东', '东南', '南', '西南', '西', '西北'];
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function compassLabel(deg) {
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return COMPASS_8[Math.round((((deg % 360) + 360) % 360) / 45) % 8];
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}
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/** WGS-84 -> GCJ-02（国内高德/腾讯地图需要火星坐标） */
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function wgs84ToGcj02(lng, lat) {
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const PI = Math.PI;
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const A = 6378245.0;
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const EE = 0.00669342162296594323;
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const outOfChina = (l, b) => l < 73.66 || l > 135.05 || b < 3.86 || b > 53.55;
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if (outOfChina(lng, lat)) return [lng, lat];
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const transformLat = (x, y) => {
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let r = -100 + 2 * x + 3 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
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r += ((20 * Math.sin(6 * x * PI) + 20 * Math.sin(2 * x * PI)) * 2) / 3;
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r += ((20 * Math.sin(y * PI) + 40 * Math.sin((y / 3) * PI)) * 2) / 3;
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r += ((160 * Math.sin((y / 12) * PI) + 320 * Math.sin((y * PI) / 30)) * 2) / 3;
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return r;
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};
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const transformLon = (x, y) => {
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let r = 300 + x + 2 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
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r += ((20 * Math.sin(6 * x * PI) + 20 * Math.sin(2 * x * PI)) * 2) / 3;
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r += ((20 * Math.sin(x * PI) + 40 * Math.sin((x / 3) * PI)) * 2) / 3;
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r += ((150 * Math.sin((x / 12) * PI) + 300 * Math.sin((x / 30) * PI)) * 2) / 3;
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return r;
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};
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let dLat = transformLat(lng - 105, lat - 35);
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let dLon = transformLon(lng - 105, lat - 35);
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const radLat = (lat / 180) * PI;
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let magic = Math.sin(radLat);
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magic = 1 - EE * magic * magic;
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const sqrtMagic = Math.sqrt(magic);
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dLat = (dLat * 180) / ((A * (1 - EE)) / (magic * sqrtMagic) * PI);
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dLon = (dLon * 180) / (A / sqrtMagic * Math.cos(radLat) * PI);
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return [lng + dLon, lat + dLat];
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}
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/** GCJ-02 -> WGS-84（迭代逼近，误差 < 1m），用于把高德结果转回通用坐标 */
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function gcj02ToWgs84(lng, lat) {
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let wLng = lng;
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let wLat = lat;
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for (let i = 0; i < 5; i += 1) {
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const [gLng, gLat] = wgs84ToGcj02(wLng, wLat);
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wLng += lng - gLng;
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wLat += lat - gLat;
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}
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return [wLng, wLat];
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}
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/** 由中心点与公里半径得到 bbox：minLon,minLat,maxLon,maxLat */
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function bboxFromRadius(lat, lon, radiusKm) {
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const dLat = radiusKm / 111.32;
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const cos = Math.max(0.2, Math.cos(toRad(lat)));
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const dLon = radiusKm / (111.32 * cos);
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return [lon - dLon, lat - dLat, lon + dLon, lat + dLat].map((v) => round(v, 4));
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}
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// -------------------------------------------------------------- 日期工具
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function todayISO() {
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const d = new Date();
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return new Date(d.getTime() - d.getTimezoneOffset() * 60000).toISOString().slice(0, 10);
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}
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function isoToUTC(iso) {
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const [y, m, d] = iso.split('-').map(Number);
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return Date.UTC(y, m - 1, d);
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}
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function utcToISO(ms) {
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return new Date(ms).toISOString().slice(0, 10);
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}
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function addDaysISO(iso, n) {
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return utcToISO(isoToUTC(iso) + n * 86400000);
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}
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function addYearsISO(iso, n) {
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const [y, m, d] = iso.split('-').map(Number);
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// 处理 2/29
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const day = m === 2 && d === 29 ? 28 : d;
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return `${y + n}-${String(m).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
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}
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function diffDays(aISO, bISO) {
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return Math.round((isoToUTC(bISO) - isoToUTC(aISO)) / 86400000);
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}
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function eachDate(startISO, endISO, cap = 31) {
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const out = [];
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const n = Math.min(cap, Math.max(0, diffDays(startISO, endISO)) + 1);
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for (let i = 0; i < n; i += 1) out.push(addDaysISO(startISO, i));
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return out;
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}
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function weekdayCN(iso) {
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return ['周日', '周一', '周二', '周三', '周四', '周五', '周六'][new Date(isoToUTC(iso)).getUTCDay()];
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}
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function isValidISO(s) {
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return /^\d{4}-\d{2}-\d{2}$/.test(s) && !Number.isNaN(isoToUTC(s));
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}
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function chunk(arr, size) {
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const out = [];
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for (let i = 0; i < arr.length; i += size) out.push(arr.slice(i, i + size));
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return out;
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}
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// ------------------------------------------------------------------- 其它
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function normalizeName(s) {
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return String(s || '').replace(/[\s·・()（）\[\]【】"'"']/g, '').toLowerCase();
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}
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function esc(s) {
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return String(s == null ? '' : s)
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.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>')
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.replace(/"/g, '"').replace(/'/g, ''');
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}
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module.exports = {
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clamp, round, fetchWithTimeout, fetchJSON, mapLimit, attempt,
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haversine, bearing, compassLabel, bboxFromRadius, wgs84ToGcj02, gcj02ToWgs84,
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todayISO, isoToUTC, utcToISO, addDaysISO, addYearsISO, diffDays, eachDate,
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weekdayCN, isValidISO, chunk, normalizeName, esc,
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};
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