Allow segments with no routes

README.md

@@ -0,0 +1,3 @@
+https://wiki.openstreetmap.org/wiki/Montpellier/Transports_en_commun
+
+http://data.montpellier3m.fr/dataset/offre-de-transport-tam-en-temps-reel

src/front/map.js

@@ -23,15 +23,31 @@ h0NmFsdzQ3emxqIn0.cyxF0h36emIMTk3cc4VqUw`;
 
 const network = require('../tam/network.json');
 
+const getRouteColors = routes =>
+{
+    const colors = routes.filter(
+        // Only consider normal routes (excluding alternate routes)
+        ([lineRef, routeRef]) =>
+        network.lines[lineRef].routes[routeRef].state === 'normal'
+    ).map(([lineRef]) => network.lines[lineRef].color);
+
+    if (colors.length >= 1)
+    {
+        return colors;
+    }
+
+    return ['#FFFFFF'];
+};
+
 const makeDataSources = async () =>
 {
     const segmentsSource = new VectorSource();
     const stopsSource = new VectorSource();
 
     segmentsSource.addFeatures(
-        Object.values(network.segments).map(({lines, points}) =>
+        Object.values(network.segments).map(({routes, points}) =>
             new Feature({
-                colors: lines.map(line => network.lines[line].color),
+                colors: getRouteColors(routes),
                 geometry: new LineString(points.map(
                     ({lat, lon}) => proj.fromLonLat([lon, lat])
                 )),
@@ -40,9 +56,9 @@ const makeDataSources = async () =>
     );
 
     stopsSource.addFeatures(
-        Object.values(network.stops).map(({lines, lon, lat}) =>
+        Object.values(network.stops).map(({routes, lon, lat}) =>
             new Feature({
-                colors: lines.map(line => network.lines[line].color),
+                colors: getRouteColors(routes),
                 geometry: new Point(proj.fromLonLat([lon, lat])),
             })
         )

src/tam/network.js

@@ -17,111 +17,6 @@ const util = require('../util');
 const osm = require('./sources/osm');
 const tam = require('./sources/tam');
 
-/**
- * Use theoretical passings data to guess which lines use which stops in which
- * direction.
- *
- * This is used for suggesting possible stop IDs for stops that don’t have
- * one in OSM.
- *
- * @return Map containing for each stop its abbreviated name, the lines that
- * use it and in which directions it is used.
- */
-const fetchStopsRefAssociations = () => new Promise((res, rej) =>
-{
-    const stops = {};
-
-    tam.fetchTheoretical((err, row) =>
-    {
-        if (err)
-        {
-            rej(err);
-            return;
-        }
-
-        if (!row)
-        {
-            res(stops);
-            return;
-        }
-
-        let line = row.routeShortName;
-
-        if (line === '4')
-        {
-            line += row.directionId === '0' ? 'A' : 'B';
-        }
-
-        if (!(row.stopId in stops))
-        {
-            stops[row.stopId] = {
-                name: row.stopName,
-                lines: new Set([line]),
-                directions: new Set([row.tripHeadsign]),
-            };
-        }
-        else
-        {
-            const stop = stops[row.stopId];
-
-            if (stop.name !== row.stopName)
-            {
-                console.warn(`Stop ${row.stopId} has multiple names: \
-“${row.stopName}” and “${stop.name}”. Only the first one will be considered.`);
-            }
-
-            stop.lines.add(line);
-            stop.directions.add(row.tripHeadsign);
-        }
-    });
-});
-
-// Mapping for abbreviations used in stop names
-const stopAbbreviations = {
-    st: 'saint',
-};
-
-/**
- * Convert a stop name to a canonical representation suitable for
- * comparing two names.
- *
- * @param stopName Original stop name.
- * @return List of normalized tokens in the name.
- */
-const canonicalizeStopName = stopName => stopName
-    .toLowerCase()
-
-    // Remove diacritics
-    .normalize('NFD').replace(/[\u0300-\u036f]/g, '')
-
-    // Only keep alpha-numeric characters
-    .replace(/[^a-z0-9]/g, ' ')
-
-    // Split in tokens longer than two characters
-    .split(/\s+/g).filter(part => part.length >= 2)
-
-    // Resolve well-known abbreviations
-    .map(part => part in stopAbbreviations ? stopAbbreviations[part] : part);
-
-/**
- * Compute a matching score between two stop names.
- *
- * @param fullName Stop name in full.
- * @param abbrName Abbreviated stop name.
- * @return Matching score (number of common tokens).
- */
-const matchStopNames = (fullName, abbrName) =>
-{
-    const canonicalFullName = canonicalizeStopName(fullName);
-    const canonicalAbbrName = canonicalizeStopName(abbrName);
-
-    return canonicalFullName.filter(part =>
-        canonicalAbbrName.findIndex(abbrPart =>
-            part.startsWith(abbrPart)
-        ) !== -1
-    ).length;
-};
-
 /**
  * Fetch stops and lines of the network.
  *
@@ -142,9 +37,6 @@ relation[network="TaM"][type="route_master"][ref~"^(${lineRefs.join('|')})$"];
 out body qt;
 `);
 
-    // Retrieve stop associations from TaM
-    const associations = await fetchStopsRefAssociations();
-
     // List of retrieved objects
     const elementsList = rawData.elements;
 
@@ -173,11 +65,15 @@ out body qt;
         const color = routeMaster.tags.colour || '#000000';
 
         // Extract all routes for the given line
-        const rawRoutes = routeMaster.members.map(({ref}) => elements[ref]);
+        const routes = [];
 
-        // Add missing stops to the result object
+        for (let [routeRef, {ref: routeId}] of routeMaster.members.entries())
-        for (let route of rawRoutes)
         {
+            const route = elements[routeId];
+            const {from, to, name} = route.tags;
+            const state = route.tags.state || 'normal';
+
+            // Add missing stops to the global stops object
             for (let {ref, role} of route.members)
             {
                 if (role === 'stop')
@@ -186,69 +82,9 @@ out body qt;
 
                     if (!('ref' in stop.tags))
                     {
-                        console.warn(`Stop ${stop.id} is missing a “ref” tag
+                        throw new Error(`Stop ${stop.id}
-Name: ${stop.tags.name}
+(${osm.viewNode(stop.id)}) on line ${route.tags.name} is missing
-Part of line: ${route.tags.name}
+a “ref” tag`);
-URI: ${osm.viewNode(stop.id)}
-`);
-
-                        // Try to identify stops matching this stop in the
-                        // TaM-provided data, using the stop name, line number
-                        // and trip direction
-                        const candidates = Object.entries(associations).filter(
-                            ([, {lines}]) => lines.has(route.tags.ref)
-                        ).map(([stopRef, {name, lines, directions}]) => ({
-                            stopRef,
-                            lines,
-
-                            name,
-                            nameScore: matchStopNames(stop.tags.name, name),
-
-                            directions,
-                            directionScore: Math.max(
-                                ...Array.from(directions).map(direction =>
-                                    matchStopNames(route.tags.to, direction)
-                                )
-                            ),
-                        }))
-                            // Only keep non-zero scores for both criteria
-                            .filter(({nameScore, directionScore}) =>
-                                nameScore && directionScore
-                            )
-                            // Sort by best name score then best direction
-                            .sort(({
-                                nameScore: nameScore1,
-                                directionScore: directionScore1,
-                            }, {
-                                nameScore: nameScore2,
-                                directionScore: directionScore2,
-                            }) =>
-                                (nameScore2 - nameScore1)
-                                || (directionScore2 - directionScore1)
-                            )
-                            .slice(0, 4);
-
-                        if (candidates.length === 0)
-                        {
-                            console.warn('No candidate found in TaM data.');
-                        }
-                        else
-                        {
-                            console.warn('Candidates:');
-
-                            for (let candidate of candidates)
-                            {
-                                console.warn(`\
-    — Stop ${candidate.stopRef} with name “${candidate.name}” used by \
-${util.choosePlural(candidate.lines.length, 'line', '.s')} \
-${util.joinSentence(Array.from(candidate.lines), ', ', ' and ')} going to \
-${util.joinSentence(Array.from(candidate.directions), ', ', ' or ')}
-      Apply in JOSM: ${osm.addTagsToNode(stop.id, ['ref=' + candidate.stopRef])}
-`);
-                            }
-                        }
-
-                        console.warn('');
                     }
 
                     if (!(stop.tags.ref in stops))
@@ -257,23 +93,15 @@ ${util.joinSentence(Array.from(candidate.directions), ', ', ' or ')}
                             lat: stop.lat,
                             lon: stop.lon,
                             name: stop.tags.name,
-                            lines: new Set([lineRef]),
+                            routes: [[lineRef, routeRef]],
                         };
                     }
                     else
                     {
-                        stops[stop.tags.ref].lines.add(lineRef);
+                        stops[stop.tags.ref].routes.push([lineRef, routeRef]);
                     }
                 }
             }
-        }
-
-        // Reconstruct the line’s route from stop to stop
-        const routes = [];
-
-        for (let route of rawRoutes)
-        {
-            const {from, to, name} = route.tags;
 
             // Check that the route consists of a block of stops and platforms
             // followed by a block of routes as dictated by PTv2
@@ -300,7 +128,7 @@ of ${name}`);
             // List of stops in the route, expected to be in the timetable
             // order as per PTv2 and to be traversed in order by the sequence
             // of ways extracted below
-            const stops = route.members.slice(0, relationPivot)
+            const lineStops = route.members.slice(0, relationPivot)
                 .filter(({role}) => role === 'stop')
                 .map(({ref}) => ref);
 
@@ -311,7 +139,7 @@ of ${name}`);
 
             // Merge all used ways in a single path
             let path = [];
-            let currentNode = stops[0];
+            let currentNode = lineStops[0];
 
             for (let wayIndex = 0; wayIndex < ways.length; wayIndex += 1)
             {
@@ -372,15 +200,15 @@ ${name} is one-way and cannot be used in reverse.`);
             }
 
             // Split the path into segments between stops
-            for (let stopIndex = 0; stopIndex + 1 < stops.length; ++stopIndex)
+            for (let stopIdx = 0; stopIdx + 1 < lineStops.length; ++stopIdx)
             {
-                const begin = elements[stops[stopIndex]].tags.ref;
+                const begin = elements[lineStops[stopIdx]].tags.ref;
-                const end = elements[stops[stopIndex + 1]].tags.ref;
+                const end = elements[lineStops[stopIdx + 1]].tags.ref;
 
                 const id = `${begin}-${end}`;
                 const nodes = path.slice(
-                    path.indexOf(stops[stopIndex]),
+                    path.indexOf(lineStops[stopIdx]),
-                    path.indexOf(stops[stopIndex + 1]) + 1,
+                    path.indexOf(lineStops[stopIdx + 1]) + 1,
                 );
 
                 if (id in segments)
@@ -391,7 +219,7 @@ ${name} is one-way and cannot be used in reverse.`);
 different sequence of nodes in two or more lines.`);
                     }
 
-                    segments[id].lines.add(lineRef);
+                    segments[id].routes.push([lineRef, routeRef]);
                 }
                 else
                 {
@@ -418,15 +246,17 @@ different sequence of nodes in two or more lines.`);
                         // Keep track of the original sequence of nodes to
                         // compare with duplicates
                         nodes,
+
                         points,
-                        lines: new Set([lineRef]),
+                        routes: [[lineRef, routeRef]],
                     };
                 }
             }
 
             routes.push({
-                from, to, name,
+                from, to,
-                stops: stops.map(id => elements[id].tags.ref),
+                name, state,
+                stops: lineStops.map(id => elements[id].tags.ref),
             });
         }