tests: Add a benchmark for Delimiters::from_byte

Author: emilio

src/parser.rs

@@ -313,7 +313,7 @@ impl Delimiters {
     }
 
     #[inline]
-    fn from_byte(byte: Option<u8>) -> Delimiters {
+    pub(crate) fn from_byte(byte: Option<u8>) -> Delimiters {
         const TABLE: [Delimiters; 255] = {
             let mut table = [Delimiter::None; 255];
             table[b';' as usize] = Delimiter::Semicolon;

src/tests.rs

@@ -9,7 +9,7 @@ use encoding_rs;
 use serde_json::{self, json, Map, Value};
 
 use crate::color::{parse_color_with, FromParsedColor};
-use crate::{ColorParser, PredefinedColorSpace};
+use crate::{ColorParser, PredefinedColorSpace, Delimiters};
 
 #[cfg(feature = "bench")]
 use self::test::Bencher;
@@ -922,6 +922,18 @@ impl<'a> ToJson for CowRcStr<'a> {
     }
 }
 
+#[bench]
+#[cfg(feature = "bench")]
+fn delimiter_from_byte(b: &mut Bencher) {
+    b.iter(|| {
+        for _ in 0..1000 {
+            for i in 0..255 {
+                std::hint::black_box(Delimiters::from_byte(Some(i as u8)));
+            }
+        }
+    })
+}
+
 #[cfg(feature = "bench")]
 const BACKGROUND_IMAGE: &'static str = include_str!("big-data-url.css");