Add small demo script

demo.py

+#!/usr/bin/env python3
+
+from nlmaps_tools.parse_mrl import MrlGrammar, Symbol
+from nlmaps_tools.answer_mrl import (add_name_tags, canonicalize_nwr_features,
+                                     ENV as overpass_ql_env, transform_features)
+
+
+MRL_IN = "query(area(keyval('name','berlin')),nwr(keyval('diet:vegan',or('only','yes')),keyval('shop','*'),keyval('wheelchair','yes')),qtype(latlong))"
+MRL_AROUND = "query(around(center(nwr(keyval('name','Camp Nou'))),search(nwr(keyval('amenity',or('cafe','restaurant')))),maxdist(1000)),qtype(count))"
+MRL_DIST_CLOSEST = "dist(query(area(keyval('name','Michelfeld')),nwr(keyval('name','Churr')),qtype(latlong)),query(area(keyval('name','Michelfeld')),nwr(keyval('name','Hagenmueller'),keyval('shop','hairdresser')),qtype(latlong)))"
+MRL_DIST_BETWEEN = "dist(query(nwr(keyval('name','HL College of commerce')),qtype(latlong)),query(nwr(keyval('name','Tapan Hospital')),qtype(latlong)))"
+
+
+def main():
+    mrl = MRL_AROUND
+    print(mrl)
+    print()
+
+    # Parse MRL
+    grammar = MrlGrammar()
+    # (MRLs in the NLMaps datasets are actually never “escaped”. See
+    # MrlGrammar.parseMrl for what that means.)
+    parse_result = grammar.parseMrl(mrl, is_escaped=False)
+    features = parse_result['features']
+    print(features)
+    print()
+
+    # Add tags like int_name and alt_name
+    features = transform_features(features, add_name_tags)
+    print(features)
+    print()
+
+    # Canonicalize features, i.e. dissolve “or” around values into “or” around
+    # tags.
+    features = transform_features(features, canonicalize_nwr_features)
+    print(features)
+    print()
+
+    # Render as Overpass QL
+    # Does not work for MRL_DIST_*
+    # For the DIST_BETWEEN, use in_query.jinja2 for each of the two sub-query
+    # For the DIST_CLOSEST, use around_query.jinja2 for the one sub-query
+    template_name = features['query_type'] + '.jinja2'
+    template = overpass_ql_env.get_template(template_name)
+    ql = template.render(features=features)
+    print(ql)
+
+
+if __name__ == '__main__':
+    main()

nlmaps_tools/answer_mrl.py

@@ -10,7 +10,6 @@ from urllib.error import HTTPError
 from geopy.distance import geodesic
 import jinja2
 from OSMPythonTools.nominatim import Nominatim
-from OSMPythonTools.overpass import Overpass
 
 from nlmaps_tools.parse_mrl import MrlGrammar, Symbol
 from nlmaps_tools.overpass_round_robin import OverpassRoundRobin