每日运势小程序

DailyFortuneGuide/utils/region.js

@@ -0,0 +1,81 @@
+const MAX_REGION_LENGTH = 3;
+
+function sanitizeSegment(value) {
+  if (typeof value !== "string") {
+    return "";
+  }
+  const trimmed = value.trim();
+  if (!trimmed || trimmed === "全部") {
+    return "";
+  }
+  return trimmed;
+}
+
+function normalizeRegionArray(region) {
+  if (!Array.isArray(region)) {
+    return [];
+  }
+  const sanitized = region.map(sanitizeSegment);
+  const hasValue = sanitized.some(Boolean);
+  if (!hasValue) {
+    return [];
+  }
+  const normalized = sanitized.slice(0, MAX_REGION_LENGTH);
+  while (normalized.length < MAX_REGION_LENGTH) {
+    normalized.push("");
+  }
+  return normalized;
+}
+
+function deriveRegionFromParts(parts = {}) {
+  const segments = [];
+  if (parts.province) {
+    segments.push(parts.province);
+  }
+  if (parts.city) {
+    segments.push(parts.city);
+  }
+  if (parts.district && parts.district !== parts.city) {
+    segments.push(parts.district);
+  }
+  if (!segments.length && parts.city) {
+    segments.push(parts.city);
+  }
+  return normalizeRegionArray(segments);
+}
+
+function getRegionParts(region, fallback = {}) {
+  const normalized = normalizeRegionArray(region);
+  if (!normalized.length) {
+    return {
+      province: sanitizeSegment(fallback.province),
+      city: sanitizeSegment(fallback.city),
+      district: sanitizeSegment(fallback.district)
+    };
+  }
+  const [province = "", city = "", district = ""] = normalized;
+  return {
+    province: province || sanitizeSegment(fallback.province),
+    city: city || province || sanitizeSegment(fallback.city),
+    district: district || sanitizeSegment(fallback.district)
+  };
+}
+
+function formatRegionDisplay(region, fallbackList = []) {
+  const normalized = normalizeRegionArray(region);
+  const source = normalized.length ? normalized : fallbackList;
+  if (!source || !source.length) {
+    return "";
+  }
+  return source
+    .filter(sanitizeSegment)
+    .filter((item, index, arr) => arr.indexOf(item) === index)
+    .join(" · ");
+}
+
+module.exports = {
+  normalizeRegionArray,
+  deriveRegionFromParts,
+  getRegionParts,
+  formatRegionDisplay
+};