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Plugin Description
The EBNF parser and renderer is built off of the one created by Vincent Tscherter ( http://karmin.ch/ebnf/index ).
The diagrams are stored / cached as PNG images.
Enclose your grammar defintions within [ebnf] shortcodes using the form: [ebnf] GRAMMAR [/ebnf]
You can use any of three optional addtributes
- title – Define the generated image title
- alt – Define the generated image alt tag
- link – Set to, “no” if you don’t want the image tag to link to the image file
- arrows – Set to a truthy value to turn arrows on. Leave out or set falsey to turn off. (e.g.
arrows="1" to turn on)
For the grammar group things with parentheses (). Use | for “or”, use [...] for one or more times,
and {...} for zero or more times.
Enclose the entire grammar in {...} and included and optional title with "..."
For example here is how you would create railroad diagrams for JSON with EBNFer:
[ebnf title="JSON RR Diagram"]
"JSON" {
object = "{" [ ( string ':' value ) { ',' string ':' value } ] "}".
array = '[' [ value { ',' value } ] ']'.
}
[/ebnf]
Stay tuned for
- Smarter image caching
- Smarter renderer
- Switch out bracket styled grammar definitions with Regex styled grammar definitions
Screenshots
-
JSON RR diagram created using the example code in the description.
-
A RR diagram explaining the grammar to create RR diagrams with EBNFer
