1 files changed, 53 insertions, 0 deletions
diff --git a/debian/tests/test_modules/topojson-client/src/mesh.js b/debian/tests/test_modules/topojson-client/src/mesh.js
new file mode 100644
index 0000000..e0b7097
--- /dev/null
+++ b/debian/tests/test_modules/topojson-client/src/mesh.js
@@ -0,0 +1,53 @@
+import {object} from "./feature.js";
+import stitch from "./stitch.js";
+
+export default function(topology) {
+  return object(topology, meshArcs.apply(this, arguments));
+}
+
+export function meshArcs(topology, object, filter) {
+  var arcs, i, n;
+  if (arguments.length > 1) arcs = extractArcs(topology, object, filter);
+  else for (i = 0, arcs = new Array(n = topology.arcs.length); i < n; ++i) arcs[i] = i;
+  return {type: "MultiLineString", arcs: stitch(topology, arcs)};
+}
+
+function extractArcs(topology, object, filter) {
+  var arcs = [],
+      geomsByArc = [],
+      geom;
+
+  function extract0(i) {
+    var j = i < 0 ? ~i : i;
+    (geomsByArc[j] || (geomsByArc[j] = [])).push({i: i, g: geom});
+  }
+
+  function extract1(arcs) {
+    arcs.forEach(extract0);
+  }
+
+  function extract2(arcs) {
+    arcs.forEach(extract1);
+  }
+
+  function extract3(arcs) {
+    arcs.forEach(extract2);
+  }
+
+  function geometry(o) {
+    switch (geom = o, o.type) {
+      case "GeometryCollection": o.geometries.forEach(geometry); break;
+      case "LineString": extract1(o.arcs); break;
+      case "MultiLineString": case "Polygon": extract2(o.arcs); break;
+      case "MultiPolygon": extract3(o.arcs); break;
+    }
+  }
+
+  geometry(object);
+
+  geomsByArc.forEach(filter == null
+      ? function(geoms) { arcs.push(geoms[0].i); }
+      : function(geoms) { if (filter(geoms[0].g, geoms[geoms.length - 1].g)) arcs.push(geoms[0].i); });
+
+  return arcs;
+}