Badly rendered railroad diagram
sammorley-short opened this issue · comments
I’m trying to generate a pyparsing grammar railroad diagram, as described here, but when I run the example script the render comes out wrong with all these black boxes.
Script:
from pyparsing import Word, nums, alphas
street_address = Word(nums).set_name("house_number") + Word(alphas)[1, ...].set_name("street_name")
street_address.set_name("street_address")
street_address.create_diagram("street_address_diagram.html")Render:
(To install, I ran pip install "pyparsing[diagrams]")
What am I doing wrong?
What versions of pyparsing and railroad-diagrams are you using?
I just started seeing this recently also, but thought it was an artifact of my using Unicode characters in my grammar.
It looks like a problem with the latest release of railroad-diagrams. When I reverted to version 2.0.4, the diagrams were properly rendered.
pip install -U railroad-diagrams==2.0.4
I'll follow up and submit a ticket to that project.
On reading the release notes, the call interface changed in 3.x. I'll look to see what changes are necessary in pyparsing for this updated version.