Add basic parsing benchmark 🌩

Cargo.toml

@@ -23,12 +23,18 @@ serialize = []
 fs = ["fontdock/fs"]
 
 [dev-dependencies]
+criterion = "0.3"
 futures-executor = "0.3"
 serde_json = "1"
 raqote = { version = "0.8", default-features = false }
 
 [[test]]
-name = "test-typeset"
+name = "typeset"
 path = "tests/test_typeset.rs"
 required-features = ["fs"]
 harness = false
+
+[[bench]]
+name = "bench-parsing"
+path = "benches/bench_parsing.rs"
+harness = false

benches/bench_parsing.rs

@@ -0,0 +1,24 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use typstc::library::_std;
+use typstc::syntax::parsing::{parse, ParseState};
+use typstc::syntax::span::Pos;
+
+// 28 not too dense lines.
+const COMA: &str = include_str!("../tests/coma.typ");
+
+fn parsing_benchmark(c: &mut Criterion) {
+    let state = ParseState { scope: _std() };
+
+    c.bench_function("parse-coma-28-lines", |b| {
+        b.iter(|| parse(COMA, Pos::ZERO, &state))
+    });
+
+    // 2800 lines of Typst code.
+    let long = COMA.repeat(100);
+    c.bench_function("parse-coma-2800-lines", |b| {
+        b.iter(|| parse(&long, Pos::ZERO, &state))
+    });
+}
+
+criterion_group!(benches, parsing_benchmark);
+criterion_main!(benches);