option to output route as JSON

src/c3nav/routing/route.py

@@ -1,3 +1,5 @@
+from collections import OrderedDict
+
 import copy
 
 import numpy as np
@@ -18,6 +20,12 @@ class Route:
 
         self.routeparts = None
 
+    def serialize(self):
+        return OrderedDict((
+            ('distance', float(self.distance)),
+            ('routeparts', [routepart.serialize() for routepart in self.routeparts]),
+        ))
+
     def __repr__(self):
         return ('<Route (\n    %s\n) distance=%f>' %
                 ('\n    '.join(repr(connection) for connection in self.connections), self.distance))
@@ -227,6 +235,12 @@ class RoutePart:
         self.level = graphlevel.level
         self.lines = lines
 
+    def serialize(self):
+        return OrderedDict((
+            ('level', self.level.name),
+            ('lines', [line.serialize() for line in self.lines]),
+        ))
+
     def render_svg_coordinates(self):
         svg_width, svg_height = get_dimensions()
 
@@ -283,6 +297,17 @@ class RouteLine:
         self.title = None
         self.description = None
 
+    def serialize(self):
+        return OrderedDict((
+            ('from_point', tuple(self.from_point.xy)),
+            ('to_point', tuple(self.to_point.xy)),
+            ('distance', float(self.distance)),
+            ('icon', self.icon),
+            ('ignore', self.ignore),
+            ('title', self.title),
+            ('description', self.description),
+        ))
+
 
 class NoRoute:
     distance = np.inf

src/c3nav/site/views.py

@@ -3,6 +3,7 @@ from datetime import timedelta
 import qrcode
 from django.core.files import File
 from django.http import Http404, HttpResponse, HttpResponseNotModified
+from django.http import JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.utils import timezone
@@ -216,6 +217,12 @@ def main(request, location=None, origin=None, destination=None):
             route.describe(allowed_ctypes)
             ctx.update({'route': route})
 
+    if request.GET.get('format') == 'json':
+        if 'error' in ctx:
+            return JsonResponse({'error': ctx['error']})
+        if 'route' in ctx:
+            return JsonResponse({'route': ctx['route'].serialize()})
+
     response = render(request, 'site/main.html', ctx)
 
     if request.method == 'POST' and save_settings: