BNFGen generates random texts based on user-defined context-free grammars specified in a BNF-like syntax. There are descriptive syntax error messages and tracing options.

You can specify "weight" for rules with alternation to influence their probabilities. For example, in <foo> ::= 10 <foo> "foo" | "foo"; the first (recursive) option will be taken ten times more often.

You can also specify deterministic repetition ranges, like <foo>{4} (exactly four of <foo>) or <foo>{1,5} (from one to five of <foo>).

This package includes both a library and a CLI tool based on it.