Add benchmarks.

benches/parsing.rs

@@ -0,0 +1,83 @@
+#![feature(test)]
+
+///! Test parsing expressions
+extern crate test;
+
+use rhai::{Engine, OptimizationLevel};
+use test::Bencher;
+
+#[bench]
+fn bench_parse_single(bench: &mut Bencher) {
+    let script = "1";
+
+    let mut engine = Engine::new();
+    engine.set_optimization_level(OptimizationLevel::None);
+
+    bench.iter(|| engine.compile_expression(script).unwrap());
+}
+
+#[bench]
+fn bench_parse_simple(bench: &mut Bencher) {
+    let script = "(requests_made * requests_succeeded / 100) >= 90";
+
+    let mut engine = Engine::new();
+    engine.set_optimization_level(OptimizationLevel::None);
+
+    bench.iter(|| engine.compile_expression(script).unwrap());
+}
+
+#[bench]
+fn bench_parse_full(bench: &mut Bencher) {
+    let script = r#"
+            2 > 1 &&
+            "something" != "nothing" ||
+            "2014-01-20" < "Wed Jul  8 23:07:35 MDT 2015" &&
+            [array, with, spaces].len() <= #{prop:name}.len() &&
+            modifierTest + 1000 / 2 > (80 * 100 % 2)
+        "#;
+
+    let mut engine = Engine::new();
+    engine.set_optimization_level(OptimizationLevel::None);
+
+    bench.iter(|| engine.compile_expression(script).unwrap());
+}
+
+#[bench]
+fn bench_parse_primes(bench: &mut Bencher) {
+    let script = r#"
+            // This script uses the Sieve of Eratosthenes to calculate prime numbers.
+
+            let now = timestamp();
+            
+            const MAX_NUMBER_TO_CHECK = 10_000;     // 1229 primes <= 10000
+            
+            let prime_mask = [];
+            prime_mask.pad(MAX_NUMBER_TO_CHECK, true);
+            
+            prime_mask[0] = prime_mask[1] = false;
+            
+            let total_primes_found = 0;
+            
+            for p in range(2, MAX_NUMBER_TO_CHECK) {
+                if prime_mask[p] {
+                    print(p);
+            
+                    total_primes_found += 1;
+                    let i = 2 * p;
+            
+                    while i < MAX_NUMBER_TO_CHECK {
+                        prime_mask[i] = false;
+                        i += p;
+                    }
+                }
+            }
+            
+            print("Total " + total_primes_found + " primes.");
+            print("Run time = " + now.elapsed() + " seconds.");
+        "#;
+
+    let mut engine = Engine::new();
+    engine.set_optimization_level(OptimizationLevel::None);
+
+    bench.iter(|| engine.compile(script).unwrap());
+}