Software for creating "Language Diagrams" structures

Question

Hello,

In json.org website you can see several diagrams (which I don't know that correct term to describe) that shows the whole valid syntax of the language. For example http://json.org/object.gif

How do these diagrams called?

What software do you use to create them?

Thank you, Maxim.

Answer 1

Railroad/Syntax diagrams can be created by different software.

Here is a generator for Ruby.

Here is one in Haskell, and one in Latex.

Answer 2

I've seen them called both Syntax diagrams and Railroad diagrams -- there are tools out there for generating them, for example this one for Ruby or this plugin for Latex

Answer 3

According to http://stackoverflow.com/questions/796824/tool-for-generating-railroad-diagram-used-on-json-org, the diagrams on the JSON website were created with Visio.

But I doubt it transforms BNF grammars into syntax diagrams.

Answer 4

Not sure if that's what you want, but ANTLRWorks is an editor for the parser generator ANTLR that displays these diagrams on-the-fly: