1 files changed, 129 insertions, 0 deletions
diff --git a/vrsite/bench_test.go b/vrsite/bench_test.go
new file mode 100644
index 0000000..8950b8f
--- /dev/null
+++ b/vrsite/bench_test.go
@@ -0,0 +1,129 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"testing"
+)
+
+// A realistic Rust chunk (~1.2KB): doc comments, generics, lifetimes, attrs,
+// strings with escapes, macros — the constructs the highlighter works hardest
+// on. Repetition parses fine; tree-sitter is not a compiler.
+var rustChunk = []byte(`//! Module documentation with some text.
+use std::{collections::HashMap, sync::Arc};
+
+/// A cached entry with generics and lifetimes.
+#[derive(Debug, Clone, PartialEq)]
+pub struct CacheEntry<'a, T: Clone + Send> {
+    pub key: &'a str,
+    pub value: Arc<T>,
+    hits: u64,
+    tags: HashMap<String, Vec<u8>>,
+}
+
+pub enum LookupResult<T> {
+    Hit(Arc<T>),
+    Miss { reason: &'static str, code: i32 },
+    Tombstone,
+}
+
+impl<'a, T: Clone + Send> CacheEntry<'a, T> {
+    pub fn new(key: &'a str, value: T) -> Self {
+        let tags = HashMap::new();
+        Self { key, value: Arc::new(value), hits: 0, tags }
+    }
+
+    /// Record a hit and return the running total.
+    pub fn touch(&mut self) -> u64 {
+        self.hits = self.hits.saturating_add(1);
+        if self.hits % 100 == 0 {
+            println!("entry {} hit {} times \"escaped\"", self.key, self.hits);
+        }
+        self.hits
+    }
+
+    pub fn lookup(&self, keys: &[&str]) -> LookupResult<T> {
+        match keys.iter().position(|k| *k == self.key) {
+            Some(_) => LookupResult::Hit(self.value.clone()),
+            None => LookupResult::Miss { reason: "absent <key>", code: -1 },
+        }
+    }
+}
+
+const MAX_ENTRIES: usize = 4096;
+static GREETING: &str = "hello \"quoted\" <world> & friends";
+`)
+
+func synthRust(size int) []byte {
+	var b bytes.Buffer
+	for b.Len() < size {
+		b.Write(rustChunk)
+	}
+	return b.Bytes()
+}
+
+var sizes = []int{128 << 10, 1 << 20, 4 << 20}
+
+func benchHL(b *testing.B) *highlighter {
+	b.Helper()
+	return newHighlighter(loadTheme("", "", "dark"), loadTheme("", "", "light"))
+}
+
+// tree-sitter parse + query + paint only
+func BenchmarkClassify(b *testing.B) {
+	hl := benchHL(b)
+	for _, size := range sizes {
+		src := synthRust(size)
+		b.Run(fmt.Sprintf("%dKB", size>>10), func(b *testing.B) {
+			b.SetBytes(int64(len(src)))
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				hl.classify("bench.rs", src)
+			}
+		})
+	}
+}
+
+// classify + full per-line HTML emit
+func BenchmarkRender(b *testing.B) {
+	hl := benchHL(b)
+	for _, size := range sizes {
+		src := synthRust(size)
+		b.Run(fmt.Sprintf("%dKB", size>>10), func(b *testing.B) {
+			b.SetBytes(int64(len(src)))
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				f := &File{Path: "bench.rs", NoteAt: map[int]int{}}
+				f.render(src, hl)
+			}
+		})
+	}
+}
+
+// template execution for an already-rendered file page
+func BenchmarkExecute(b *testing.B) {
+	hl := benchHL(b)
+	tpl := newTemplates()
+	site := &Site{
+		Title: "bench", Files: map[string]*File{},
+		Theme: loadTheme("", "", "dark"), Light: loadTheme("", "", "light"),
+		Agents: []*Agent{{Name: "bench", Short: "bench", Bit: 1}},
+	}
+	for _, size := range sizes {
+		src := synthRust(size)
+		f := &File{Path: "bench.rs", NoteAt: map[int]int{}, Traced: true, Change: "zzzzzzzz"}
+		f.cover(1, bytes.Count(src, []byte("\n"))/2, 1)
+		f.render(src, hl)
+		p := &page{Site: site, Kind: "file", Title: "bench", Root: "", Current: f.Path, File: f}
+		b.Run(fmt.Sprintf("%dKB", size>>10), func(b *testing.B) {
+			b.SetBytes(int64(len(src)))
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				if err := tpl.Execute(io.Discard, p); err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}