New shiny benchmarks with iai!

bench/Cargo.toml

@@ -11,9 +11,15 @@ layout-cache = ["typst/layout-cache"]
 
 [dev-dependencies]
 criterion = { version = "0.3", features = ["html_reports"] }
+iai = "0.1"
 typst = { path = "..", default-features = false, features = ["fs"] }
 
 [[bench]]
-name = "typst"
-path = "src/bench.rs"
+name = "clock"
+path = "src/clock.rs"
+harness = false
+
+[[bench]]
+name = "parsing"
+path = "src/parsing.rs"
 harness = false

bench/src/parsing.rs

@@ -0,0 +1,37 @@
+use iai::{black_box, main};
+
+use typst::diag::Pass;
+use typst::parse::{parse, Scanner, TokenMode, Tokens};
+use typst::syntax::SyntaxTree;
+
+const SRC: &str = include_str!("../../tests/typ/coma.typ");
+
+fn bench_decode() -> usize {
+    // We don't use chars().count() because that has a special
+    // superfast implementation.
+    let mut count = 0;
+    let mut chars = black_box(SRC).chars();
+    while let Some(_) = chars.next() {
+        count += 1;
+    }
+    count
+}
+
+fn bench_scan() -> usize {
+    let mut count = 0;
+    let mut scanner = Scanner::new(black_box(SRC));
+    while let Some(_) = scanner.eat() {
+        count += 1;
+    }
+    count
+}
+
+fn bench_tokenize() -> usize {
+    Tokens::new(black_box(SRC), black_box(TokenMode::Markup)).count()
+}
+
+fn bench_parse() -> Pass<SyntaxTree> {
+    parse(black_box(SRC))
+}
+
+main!(bench_decode, bench_scan, bench_tokenize, bench_parse);