Syntax diagram generator from SQLite with a few modifications.

Syntax description from arbitrary file

Path to a syntax description file should be specified in the command line.

Original generator reads syntax diagram description from bubble-generator-data.tcl file.

Quote and brace tokens

Allow single quote/brace tokens in the description:

string {
    line "\"" {toploop {optx char}} "\""
}

Original generator fails to process ", { and } tokens.

Recognize bracket expression tokens and render them as a hexagon figure:

char {
    line [A-Za-z0-9_]
}

To have a [ string token in the diagram escape it with /:

list {
    line /[ {toploop string ;} ]
}