This crate's aim is to generate random expressions based on a context-free grammar.
The acronym stands for "gramática livre de contexto" (context-free grammar).
use glc::{Grammar, nt, t_or_rule, nt_seq_rule};
fn main() {
let grammar = Grammar(
// starting symbol
nt!("S"),
// vector of rules
vec![
// a rule that generates a sequence of non-terminals: "A B"
nt_seq_rule!("S" => "A", "B"),
nt_seq_rule!("B" => "A", "B", "N"),
nt_seq_rule!("B" => "E"),
t_or_rule!("E" => ""),
// a rule that is an "or" of terminals: any letter from a-z
t_or_rule!(
"A" => "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
"w", "x", "y", "z"
),
t_or_rule!("N" => "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"),
],
)
// generate a random string with this grammar
println!("{}", grammar.gen());
}