A small DSL to generate syntax diagrams using [this library](https://github.com/lukaslueg/railroad).
**[Some examples](https://htmlpreview.github.io/?https://github.com/lukaslueg/railroad_dsl/blob/master/examples/example_diagrams.html)**
--
* `{...}` is a horizontal stack of connected elements
* `[...]` is a vertical sequence of connected elements
* `<...>` is a choice of multiple options, exactly one of which has to be picked
* `"foobar"` is a terminal
* `'foobar'` is a non-terminal
* `` `foobar` `` is a comment
* `...?` is an optional element
* `...*...` is a repeated element
* `!` is the empty element
Quotes (and backslashes) can be escaped using backslashes.
For example:
```
{["CONSTRAINT", "name"]?,
<["PRIMARY", "KEY", <!, "ASC", "DESC">, 'conflict-clause', <!, "AUTOINCREMENT">],
["NOT", "NULL", 'conflict-clause'],
["UNIQUE", 'conflict-clause'],
["CHECK", "(", 'expr', ")"],
["DEFAULT", <'signed-number', 'literal-value', ["(", 'expr', ")"]>],
["COLLATE", "collation-name"],
'foreign-key-clause'>}
```
