feat: add generic parser util

Author: dignifiedquire

src/main.rs

@@ -0,0 +1,39 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let source = std::env::args().nth(1).expect("missing source");
+    println!("Parsing data from {} ...", source);
+
+    let file = std::fs::File::open(&source)?;
+    let mut file = std::io::BufReader::new(file);
+
+    let iter = dasl::drisl::de::iter_from_reader::<dasl::drisl::Value, _>(&mut file);
+    let now = std::time::Instant::now();
+    let mut count = 0;
+    for (i, el) in iter.enumerate() {
+        let el = el?;
+        if i == 0 {
+            println!("{:?}", el);
+        }
+        if i % 100 == 0 {
+            print!(".");
+        }
+        count += 1;
+    }
+    println!("\n");
+
+    let done = now.elapsed();
+
+    let meta = std::fs::metadata(&source)?;
+    let mbs = meta.len() as f64 / done.as_secs_f64() / 1024. / 1024.;
+    let values_per_sec = count as f64 / done.as_secs_f64();
+
+    println!(
+        "File '{}' ({:.01}MiB)\nParsed {} values in {}ms\n{:.02} Values/s\n{:.02} MiB/s",
+        source,
+        meta.len() as f64 / 1024. / 1024.,
+        count,
+        done.as_millis(),
+        values_per_sec,
+        mbs,
+    );
+    Ok(())
+}