Limit expression/statement nesting depths.

src/api.rs

@@ -444,7 +444,14 @@ impl Engine {
         optimization_level: OptimizationLevel,
     ) -> Result<AST, Box<ParseError>> {
         let stream = lex(scripts);
-        parse(&mut stream.peekable(), self, scope, optimization_level)
+
+        parse(
+            &mut stream.peekable(),
+            self,
+            scope,
+            optimization_level,
+            (self.max_expr_depth, self.max_function_expr_depth),
+        )
     }
 
     /// Read the contents of a file into a string.
@@ -571,6 +578,7 @@ impl Engine {
             self,
             &scope,
             OptimizationLevel::None,
+            self.max_expr_depth,
         )?;
 
         // Handle null - map to ()
@@ -654,7 +662,13 @@ impl Engine {
 
         {
             let mut peekable = stream.peekable();
-            parse_global_expr(&mut peekable, self, scope, self.optimization_level)
+            parse_global_expr(
+                &mut peekable,
+                self,
+                scope,
+                self.optimization_level,
+                self.max_expr_depth,
+            )
         }
     }
 
@@ -805,8 +819,14 @@ impl Engine {
     ) -> Result<T, Box<EvalAltResult>> {
         let scripts = [script];
         let stream = lex(&scripts);
-        // Since the AST will be thrown away afterwards, don't bother to optimize it
-        let ast = parse_global_expr(&mut stream.peekable(), self, scope, OptimizationLevel::None)?;
+
+        let ast = parse_global_expr(
+            &mut stream.peekable(),
+            self,
+            scope,
+            self.optimization_level,
+            self.max_expr_depth,
+        )?;
         self.eval_ast_with_scope(scope, &ast)
     }
 
@@ -931,8 +951,13 @@ impl Engine {
         let scripts = [script];
         let stream = lex(&scripts);
 
-        // Since the AST will be thrown away afterwards, don't bother to optimize it
-        let ast = parse(&mut stream.peekable(), self, scope, OptimizationLevel::None)?;
+        let ast = parse(
+            &mut stream.peekable(),
+            self,
+            scope,
+            self.optimization_level,
+            (self.max_expr_depth, self.max_function_expr_depth),
+        )?;
         self.consume_ast_with_scope(scope, &ast)
     }