tidy bundled units codegen

Author: Zheoni

Cargo.lock

@@ -39,10 +39,11 @@ toml = { version = "0.8", optional = true }
 prettyplease = { version = "0.2", optional = true }
 quote = { version = "1", optional = true }
 syn = { version = "2", optional = true }
+proc-macro2 = { version = "1", optional = true }
 
 [features]
 default = ["aisle", "bundled_units"]
-bundled_units = ["toml", "prettyplease", "quote", "syn"]
+bundled_units = ["toml", "prettyplease", "quote", "syn", "proc-macro2"]
 aisle = []
 
 [[bench]]

Cargo.toml

@@ -1,5 +1,5 @@
 use cooklang::{
-    convert::{ConvertTo, System},
+    convert::{ConvertTo, System, UnitsFile},
     Converter, Quantity, Value,
 };
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
@@ -43,5 +43,23 @@ fn conversions(c: &mut Criterion) {
     });
 }
 
-criterion_group!(benches, conversions);
+fn bundled_units(c: &mut Criterion) {
+    let mut group = c.benchmark_group("bundled_units");
+    group.bench_function("get_bundled", |b| {
+        b.iter_batched(
+            || {},
+            |_| UnitsFile::bundled(),
+            criterion::BatchSize::NumIterations((100_000_000 / size_of::<UnitsFile>()) as u64),
+        );
+    });
+    group.bench_function("parse_toml", |b| {
+        b.iter_batched(
+            || {},
+            |_| toml::from_str::<UnitsFile>(include_str!("../units.toml")),
+            criterion::BatchSize::NumIterations((100_000_000 / size_of::<UnitsFile>()) as u64),
+        );
+    });
+}
+
+criterion_group!(benches, conversions, bundled_units);
 criterion_main!(benches);