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Feature request: add language from the "Railroad-diagram Generator" #48
Description
Add support for the language from the Railroad-diagram Generator as input.
Example:
Diagram(
Optional('+', 'skip'),
Choice(0,
NonTerminal('name-start char'),
NonTerminal('escape')),
ZeroOrMore(
Choice(0,
NonTerminal('name char'),
NonTerminal('escape'))))
Online:
https://tabatkins.github.io/railroad-diagrams/generator.html
Format documentation:
https://github.com/tabatkins/railroad-diagrams#components
Activity
katef commentedon Apr 7, 2021
Hi! Thanks! This is interesting. kgt's input is usually BNF, which is supposed to be a semantic representation of a grammar. Tab's structure here is for presentational information. For example, it offers
Stack()for vertically placed alts.kgt has several stages internally. Relevant here are the AST for BNF, and then the RRD tree (which is presentational, although still abstracted from layout coordinates).
So we'd have two options for parsing this;
Stack()construct, so we'd still skip that.Both could make sense.
https://github.com/katef/kgt/blob/main/src/ast.h
https://github.com/katef/kgt/blob/main/src/rrd/node.h