Weightless associations causes error with "direction: right"

[gadenbuie]

Weightless edges, e.g. _>, cause the diagram to appear empty. Here's a simple example

nomnoml::nomnoml('
[foo]->[bar]
[foo]_>[baz]
')

In R this renders as an empty page, whereas online it appears like this

If I pop the diagram out into the browser, there are errors in the javascript console

Uncaught TypeError: can't access property "forEach", t.points is undefined
    undo http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:2902
    undo http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:2909
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:3791
    B http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:1038
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:3790
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:3929
    B http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:1038
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:3509
    B http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:1038
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/graphre-0.1.3/graphre.js:3429
    layoutCompartment http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-1.4.0/nomnoml.js:994
    layout http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-1.4.0/nomnoml.js:1099
    parseAndRender http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-1.4.0/nomnoml.js:2992
    draw http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-1.4.0/nomnoml.js:3007
    resizeCanvas http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-binding-0.2.5/nomnoml.js:35
    renderValue http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/nomnoml-binding-0.2.5/nomnoml.js:84
    renderValue http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:886
    staticRender http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:653
    forEach http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:55
    staticRender http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:576
    forEach http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:55
    staticRender http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:574
    maybeStaticRenderLater http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:698
    <anonymous> http://localhost:25130/session/viewhtml17d6d3b7c4dc4/lib/htmlwidgets-1.5.4/htmlwidgets.js:705
graphre.js:2902:13

[gadenbuie]

I just realized that it's the direction: right directive that's causing the problem. There's an open issue in the upstream nomnoml repo: https://github.com/skanaar/nomnoml/issues/160

[andrie]

The upstream issue is still open. I'm going to pull in a newer version of nomnoml.js but this is unlikely to fix.

[andrie]

Weightless edges have now been removed from nomnoml.js

https://github.com/skanaar/nomnoml/issues/160#issuecomment-1556214365