feat(editor): the signalling mode numbers the switches of a station along it and names them after its code, the drives and the switch records follow, and an undo of names passed round among the tracks leaves the drives right

editor/editorStation.hpp

@@ -10,6 +10,7 @@ http://mozilla.org/MPL/2.0/.
 #pragma once
 
 #include <optional>
+#include <string>
 #include <vector>
 
 #include <glm/glm.hpp>
@@ -51,6 +52,14 @@ struct layout
 	double km{0.0}; // at chainage 0, when it does
 };
 
+// what shares a number of the station: a switch, or the switches of a slip, the two of a double switch, the paths of a crossing
+struct unit
+{
+	std::vector<TTrack *> parts;
+	std::string record; // the name of its record of the switches, empty without one
+	double chainage{0.0}; // of the start of its first part along the station
+};
+
 // the station of the switch, or of the plain track near one
 std::optional<layout> find(TTrack &From, options const &Options = {});
 // the chainage along the axis and the offset to the left of it, as the map shows it
@@ -59,6 +68,10 @@ glm::dvec2 project(layout const &Layout, glm::dvec3 const &Point);
 double km_of(layout const &Layout, double const Chainage);
 // one switch of each station of the scenery
 std::vector<TTrack *> stations(options const &Options = {});
+// the switches of the station by their numbers: along the chainage, or against it when Reversed; turntables have none
+std::vector<unit> numbering(layout const &Layout, bool const Reversed);
+// <code>_<number>, each part of a unit of several with a letter of its own: bpd_15a
+std::string switch_name(std::string const &Code, int const Number, std::size_t const Part, std::size_t const Parts);
 // the switches of the station of the switch, without laying it out
 std::vector<TTrack *> switches_of(TTrack &Switch, options const &Options = {});