refactor: separate Nominatim transport from search composition

docs/CODE-BOUNDARIES.md

@@ -591,6 +591,9 @@ Replacing that service with a different query language requires operation-level
 feature/geometry adapters, not just changing its URL. Rendering and geometry
 selection remain consumers of those results.
 
+`./sources/nominatim` exports the lower-level JSONv2 client and normalizers for
+server adapters without importing search composition.
+
 `./sources/http-body` exports bounded text/JSON readers using web primitives;
 `./sources/overpass` exports the quoted-string/comment lexer. The lexer alone is
 not a query validator: spatial bounds, timeouts and other policy remain in the

package.json

@@ -229,6 +229,7 @@
     "./layers/submarine-cables/source": "./src/layers/submarineCables/bundledSource.js",
     "./sources/http-body": "./src/sources/httpBody.js",
     "./sources/overpass": "./src/sources/overpass.js",
-    "./search/nominatim": "./src/search/nominatim.js"
+    "./search/nominatim": "./src/search/nominatim.js",
+    "./sources/nominatim": "./src/sources/nominatim.js"
   }
 }

scripts/format-scope.json

@@ -674,5 +674,6 @@
   "src/search/nominatim.js",
   "src/search/nominatim.test.mjs",
   "src/sources/httpBody.js",
-  "src/sources/overpass.js"
+  "src/sources/overpass.js",
+  "src/sources/nominatim.js"
 ]

scripts/package-boundaries.json

@@ -298,7 +298,8 @@
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
       "src/data/regionalModel.js",
-      "src/sources/httpBody.js"
+      "src/sources/httpBody.js",
+      "src/sources/nominatim.js"
     ],
     "external": []
   },
@@ -1636,7 +1637,8 @@
       "src/sources/reference.js",
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
-      "src/sources/httpBody.js"
+      "src/sources/httpBody.js",
+      "src/sources/nominatim.js"
     ],
     "external": [
       "@mapbox/vector-tile",
@@ -1992,7 +1994,8 @@
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
       "src/data/regionalModel.js",
-      "src/sources/httpBody.js"
+      "src/sources/httpBody.js",
+      "src/sources/nominatim.js"
     ],
     "external": [
       "cesium",
@@ -2040,7 +2043,8 @@
       "src/search/nominatim.js",
       "src/nominatimGeocode.js",
       "src/data/regionalModel.js",
-      "src/sources/httpBody.js"
+      "src/sources/httpBody.js",
+      "src/sources/nominatim.js"
     ],
     "external": [
       "cesium",
@@ -2287,7 +2291,8 @@
       "src/search/google.js",
       "src/search/geospatial.js",
       "src/data/regionalModel.js",
-      "src/sources/httpBody.js"
+      "src/sources/httpBody.js",
+      "src/sources/nominatim.js"
     ],
     "external": []
   },
@@ -2300,5 +2305,16 @@
     "exports": ["./sources/overpass"],
     "modules": ["src/sources/overpass.js"],
     "external": []
+  },
+  "nominatim-source": {
+    "exports": ["./sources/nominatim"],
+    "modules": [
+      "src/sources/nominatim.js",
+      "src/nominatimGeocode.js",
+      "src/search/geospatial.js",
+      "src/data/regionalModel.js",
+      "src/sources/httpBody.js"
+    ],
+    "external": []
   }
 }

src/search/nominatim.js

@@ -1,124 +1,14 @@
 import {
-  nominatimToGeocodeResult,
-  nominatimViewboxFromBounds,
-} from '../nominatimGeocode.js';
+  createNominatimClient,
+  normalizeNominatimResult,
+  normalizeNominatimReverse,
+} from '../sources/nominatim.js';
 import { normalizeGooglePlace } from './google.js';
-import { validCoordinate } from './geospatial.js';
-import { normalizeRegionalPlace } from '../data/regionalModel.js';
-import { readResponseJsonCapped } from '../sources/httpBody.js';
-
-/** Retain the established framing/type rules for JSON and JSONv2 results. */
-export function normalizeNominatimResult(hit) {
-  return nominatimToGeocodeResult(
-    hit && { ...hit, class: hit.class || hit.category },
-  );
-}
-
-export function normalizeNominatimReverse(hit) {
-  const result = normalizeNominatimResult(hit);
-  const region = normalizeRegionalPlace(hit);
-  if (!result || !region) return null;
-  const clean = (value) =>
-    String(value || '')
-      .replace(/[\x00-\x1f\x7f]/g, ' ')
-      .replace(/\s+/g, ' ')
-      .trim()
-      .slice(0, 120);
-  const street = clean(hit.address?.road || hit.address?.pedestrian);
-  return {
-    formattedAddress: result.formatted_address,
-    locality: region.locality,
-    region: region.region,
-    country: region.country,
-    types: result.types,
-    labels: [clean(result.formatted_address)].filter(Boolean),
-    streetLabels: street ? [street] : [],
-  };
-}
-
-/**
- * Nominatim JSONv2 transport for explicitly configured endpoints. Callers own
- * scheduling and request headers; this does not select a public instance.
- */
-export function createNominatimClient({
-  searchEndpoint,
-  reverseEndpoint,
-  fetchImpl = (...args) => fetch(...args),
-} = {}) {
-  for (const endpoint of [searchEndpoint, reverseEndpoint]) {
-    if (endpoint == null) continue;
-    if (typeof endpoint !== 'string' || !endpoint || /[?#]/.test(endpoint))
-      throw new TypeError('A query-free Nominatim endpoint is required');
-    const url = new URL(endpoint, 'http://localhost');
-    if (
-      !['http:', 'https:'].includes(url.protocol) ||
-      url.username ||
-      url.password ||
-      !(
-        (endpoint.startsWith('/') && !endpoint.startsWith('//')) ||
-        /^https?:\/\//.test(endpoint)
-      )
-    )
-      throw new TypeError('Invalid Nominatim endpoint');
-  }
-  async function request(endpoint, params, signal) {
-    signal?.throwIfAborted();
-    const response = await fetchImpl(
-      `${endpoint}?${new URLSearchParams({
-        format: 'jsonv2',
-        addressdetails: '1',
-        ...params,
-      })}`,
-      { signal, redirect: 'error' },
-    );
-    signal?.throwIfAborted();
-    if (!response.ok) {
-      await response.body?.cancel?.().catch(() => {});
-      throw new Error('Geocoding service unavailable');
-    }
-    return readResponseJsonCapped(response, 512 * 1024, signal);
-  }
-  return {
-    ...(searchEndpoint
-      ? {
-          async search(query, { bias, signal } = {}) {
-            const viewbox = nominatimViewboxFromBounds(bias);
-            const rows = await request(
-              searchEndpoint,
-              {
-                q: query,
-                limit: '1',
-                ...(viewbox ? { viewbox, bounded: '0' } : {}),
-              },
-              signal,
-            );
-            if (!Array.isArray(rows))
-              throw new Error('Invalid geocoding response');
-            if (rows.length && !normalizeNominatimResult(rows[0]))
-              throw new Error('Invalid geocoding result');
-            return rows;
-          },
-        }
-      : {}),
-    ...(reverseEndpoint
-      ? {
-          async reverse(latitude, longitude, { signal } = {}) {
-            if (!validCoordinate([longitude, latitude])) return null;
-            const row = await request(
-              reverseEndpoint,
-              { lat: latitude, lon: longitude },
-              signal,
-            );
-            // A successful, explicit no-result response is distinct from malformed data.
-            if (row?.error === 'Unable to geocode') return null;
-            if (!normalizeNominatimReverse(row))
-              throw new Error('Invalid reverse geocoding result');
-            return row;
-          },
-        }
-      : {}),
-  };
-}
+export {
+  createNominatimClient,
+  normalizeNominatimResult,
+  normalizeNominatimReverse,
+};
 
 /** Forward and reverse operations only; feature queries and routing are separate. */
 export function createNominatimProvider(options = {}) {

src/sources/nominatim.js

@@ -0,0 +1,120 @@
+import {
+  nominatimToGeocodeResult,
+  nominatimViewboxFromBounds,
+} from '../nominatimGeocode.js';
+import { validCoordinate } from '../search/geospatial.js';
+import { normalizeRegionalPlace } from '../data/regionalModel.js';
+import { readResponseJsonCapped } from './httpBody.js';
+
+/** Retain the established framing/type rules for JSON and JSONv2 results. */
+export function normalizeNominatimResult(hit) {
+  return nominatimToGeocodeResult(
+    hit && { ...hit, class: hit.class || hit.category },
+  );
+}
+
+export function normalizeNominatimReverse(hit) {
+  const result = normalizeNominatimResult(hit);
+  const region = normalizeRegionalPlace(hit);
+  if (!result || !region) return null;
+  const clean = (value) =>
+    String(value || '')
+      .replace(/[\x00-\x1f\x7f]/g, ' ')
+      .replace(/\s+/g, ' ')
+      .trim()
+      .slice(0, 120);
+  const street = clean(hit.address?.road || hit.address?.pedestrian);
+  return {
+    formattedAddress: result.formatted_address,
+    locality: region.locality,
+    region: region.region,
+    country: region.country,
+    types: result.types,
+    labels: [clean(result.formatted_address)].filter(Boolean),
+    streetLabels: street ? [street] : [],
+  };
+}
+
+/**
+ * Nominatim JSONv2 transport for explicitly configured endpoints. Callers own
+ * scheduling and request headers; this does not select a public instance.
+ */
+export function createNominatimClient({
+  searchEndpoint,
+  reverseEndpoint,
+  fetchImpl = (...args) => fetch(...args),
+} = {}) {
+  for (const endpoint of [searchEndpoint, reverseEndpoint]) {
+    if (endpoint == null) continue;
+    if (typeof endpoint !== 'string' || !endpoint || /[?#]/.test(endpoint))
+      throw new TypeError('A query-free Nominatim endpoint is required');
+    const url = new URL(endpoint, 'http://localhost');
+    if (
+      !['http:', 'https:'].includes(url.protocol) ||
+      url.username ||
+      url.password ||
+      !(
+        (endpoint.startsWith('/') && !endpoint.startsWith('//')) ||
+        /^https?:\/\//.test(endpoint)
+      )
+    )
+      throw new TypeError('Invalid Nominatim endpoint');
+  }
+  async function request(endpoint, params, signal) {
+    signal?.throwIfAborted();
+    const response = await fetchImpl(
+      `${endpoint}?${new URLSearchParams({
+        format: 'jsonv2',
+        addressdetails: '1',
+        ...params,
+      })}`,
+      { signal, redirect: 'error' },
+    );
+    signal?.throwIfAborted();
+    if (!response.ok) {
+      await response.body?.cancel?.().catch(() => {});
+      throw new Error('Geocoding service unavailable');
+    }
+    return readResponseJsonCapped(response, 512 * 1024, signal);
+  }
+  return {
+    ...(searchEndpoint
+      ? {
+          async search(query, { bias, signal } = {}) {
+            const viewbox = nominatimViewboxFromBounds(bias);
+            const rows = await request(
+              searchEndpoint,
+              {
+                q: query,
+                limit: '1',
+                ...(viewbox ? { viewbox, bounded: '0' } : {}),
+              },
+              signal,
+            );
+            if (!Array.isArray(rows))
+              throw new Error('Invalid geocoding response');
+            if (rows.length && !normalizeNominatimResult(rows[0]))
+              throw new Error('Invalid geocoding result');
+            return rows;
+          },
+        }
+      : {}),
+    ...(reverseEndpoint
+      ? {
+          async reverse(latitude, longitude, { signal } = {}) {
+            if (!validCoordinate([longitude, latitude])) return null;
+            const row = await request(
+              reverseEndpoint,
+              { lat: latitude, lon: longitude },
+              signal,
+            );
+            // A successful, explicit no-result response is distinct from malformed data.
+            if (row?.error === 'Unable to geocode') return null;
+            if (!normalizeNominatimReverse(row))
+              throw new Error('Invalid reverse geocoding result');
+            return row;
+          },
+        }
+      : {}),
+  };
+}