Add fuzzer for deeply nested parsing

Signed-off-by: Marcel Müller <neikos@neikos.email>

benches/parsing.rs

@@ -23,5 +23,26 @@ fn parsing_benchmark(c: &mut Criterion) {
     }
 }
 
-criterion_group!(benches, parsing_benchmark);
+fn parsing_nested(c: &mut Criterion) {
+    let mut parsing = c.benchmark_group("Parsing");
+
+    for size in [1, 2, 8, 12] {
+        let mut input = String::new();
+
+        for _ in 0..size {
+            input = format!(
+                "{{{{ for foo in bar }}}} {input} {{{{ if foo }}}} Hi! {input} {{{{ end }}}} Yooo {{{{ end }}}}"
+            );
+        }
+
+        let input = NomoInput::from(input);
+
+        parsing.throughput(criterion::Throughput::Bytes(input.len() as u64));
+        parsing.bench_with_input(BenchmarkId::from_parameter(size), &input, |b, input| {
+            b.iter(|| nomo::parser::parse(input.clone()).unwrap());
+        });
+    }
+}
+
+criterion_group!(benches, parsing_benchmark, parsing_nested);
 criterion_main!(benches);