Add loop expressions.

tests/expressions.rs

@@ -55,10 +55,13 @@ fn test_expressions() -> Result<(), Box<EvalAltResult>> {
         )
         .is_err());
 
-    assert!(engine.eval_expression::<()>("40 + 2;").is_err());
-    assert!(engine.eval_expression::<()>("40 + { 2 }").is_err());
-    assert!(engine.eval_expression::<()>("x = 42").is_err());
+    assert!(engine.compile_expression("40 + 2;").is_err());
+    assert!(engine.compile_expression("40 + { 2 }").is_err());
+    assert!(engine.compile_expression("x = 42").is_err());
     assert!(engine.compile_expression("let x = 42").is_err());
+    assert!(engine
+        .compile_expression("do { break 42; } while true")
+        .is_err());
 
     engine.compile("40 + { let x = 2; x }")?;
 

tests/for.rs

@@ -231,6 +231,22 @@ fn test_for_loop() -> Result<(), Box<EvalAltResult>> {
         );
     }
 
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                let a = [123, 999, 42, 0, true, "hello", "world!", 987.6543];
+
+                for (item, count) in a {
+                    switch item.type_of() {
+                        "i64" if item.is_even => break count,
+                        "f64" if item.to_int().is_even => break count,
+                    }
+                }
+            "#
+        )?,
+        2
+    );
+
     Ok(())
 }
 

tests/while_loop.rs

@@ -22,6 +22,22 @@ fn test_while() -> Result<(), Box<EvalAltResult>> {
         6
     );
 
+    assert_eq!(
+        engine.eval::<INT>(
+            "
+                let x = 0;
+
+                while x < 10 {
+                    x += 1;
+                    if x > 5 { break x * 2; }
+                    if x > 3 { continue; }
+                    x += 3;
+                }
+            ",
+        )?,
+        12
+    );
+
     Ok(())
 }
 
@@ -46,6 +62,25 @@ fn test_do() -> Result<(), Box<EvalAltResult>> {
         )?,
         6
     );
+    assert_eq!(
+        engine.eval::<INT>(
+            "
+                let x = 0;
+
+                do {
+                    x += 1;
+                    if x > 5 { break x * 2; }
+                    if x > 3 { continue; }
+                    x += 3;
+                } while x < 10;
+            ",
+        )?,
+        12
+    );
+
+    engine.run("do {} while false")?;
+
+    assert_eq!(engine.eval::<INT>("do { break 42; } while false")?, 42);
 
     Ok(())
 }