Another syntactic problem with specifying a rare map layout

[gwselke]

Here is another case where the current Map::Tube syntax does not allow to represent the state of affairs. (This is distinct from issue #17, but the underlying causes are related.)

Suppose we have a tube map with two lines: (This is a much-stripped down version of a real-world situation.)
A <-> D
and

A <-> C -> E -> D
^               v
+---------------+

Then the map-tube-generated line maps for both lines will come out wrong. For details, please refer to the included PDF file. Test data also included.

Map-Tube-Testmap-0.1.0.tar.gz
Testmap-Problem1.pdf

[gwselke]

The main issue discussed above concerns the display of lines Red and Black as diagrams.
However, some routes are also slightly off. These examples use the included lines Green ( K <-> L <-> M ) and Blue ( K -> L -> M -> K ).

map-tube --force --map=Testmap --preferred --start=M --end=K
got: M (Blue, Green), K (Blue, Green) expected: M (Blue), K (Blue) (because only Blue leads directly from M to K)

map-tube --force --map=Testmap --pref --start=L --end=K
got: L (Blue, Green), K (Blue, Green) expected: L (green), K (green) (because only Green leads directly from L to K)

map-tube --force --map=Testmap --pref --start=M --end=L
got: M (Blue, Green), L (Blue, Green) expected: M (green), L (green) (because only Green leads directly from M to L)

[manwar]

@gwselke I see this is related to graph not behaving when a special map data is provided?
If this is the case, then I am not too worried for now.
Let's get the route correctly done first.
At least, it is well documented, we can come back to it, when done with other high stake issues.

[manwar]

@gwselke Can you please suggest all possible use cases with expected routes for the above map?
I would like try it against my draft algorithm.

[gwselke]

Will do later today - gimme a little time!

[gwselke]

Complete test cases for all existing routes are now in test scripts (folder t).

Map-Tube-Testmap-0.1.1.tar.gz

[manwar]

Thanks @gwselke :-)