Move optimization_level into Options.

src/api/compile.rs

@@ -201,7 +201,11 @@ impl Engine {
         scope: &Scope,
         scripts: impl AsRef<[S]>,
     ) -> ParseResult<AST> {
-        self.compile_with_scope_and_optimization_level(scope, scripts, self.optimization_level)
+        self.compile_with_scope_and_optimization_level(
+            scope,
+            scripts,
+            self.options.optimization_level,
+        )
     }
     /// Join a list of strings and compile into an [`AST`] using own scope at a specific optimization level.
     ///
@@ -297,7 +301,12 @@ impl Engine {
 
         let mut peekable = stream.peekable();
         let mut state = ParseState::new(self, tokenizer_control);
-        self.parse_global_expr(&mut peekable, &mut state, scope, self.optimization_level)
+        self.parse_global_expr(
+            &mut peekable,
+            &mut state,
+            scope,
+            self.options.optimization_level,
+        )
     }
     /// Parse a JSON string into an [object map][crate::Map].
     /// This is a light-weight alternative to using, say,

src/api/eval.rs

@@ -67,7 +67,7 @@ impl Engine {
         let ast = self.compile_with_scope_and_optimization_level(
             scope,
             &[script],
-            self.optimization_level,
+            self.options.optimization_level,
         )?;
         self.eval_ast_with_scope(scope, &ast)
     }

src/api/optimize.rs

@@ -9,7 +9,7 @@ impl Engine {
     /// Not available under `no_optimize`.
     #[inline(always)]
     pub fn set_optimization_level(&mut self, optimization_level: OptimizationLevel) -> &mut Self {
-        self.optimization_level = optimization_level;
+        self.options.optimization_level = optimization_level;
         self
     }
 
@@ -20,7 +20,7 @@ impl Engine {
     #[inline(always)]
     #[must_use]
     pub const fn optimization_level(&self) -> OptimizationLevel {
-        self.optimization_level
+        self.options.optimization_level
     }
 
     /// Optimize the [`AST`] with constants defined in an external Scope.

src/api/options.rs

@@ -1,12 +1,14 @@
 //! Settings for [`Engine`]'s language options.
 
-use crate::Engine;
+use crate::{Engine, OptimizationLevel};
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
 
 /// A type containing all language options for the [`Engine`].
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 pub struct LanguageOptions {
+    /// Script optimization level.
+    pub optimization_level: OptimizationLevel,
     /// Is `if`-expression allowed?
     pub allow_if_expr: bool,
     /// Is `switch` expression allowed?
@@ -33,6 +35,11 @@ impl LanguageOptions {
     #[inline(always)]
     pub const fn new() -> Self {
         Self {
+            #[cfg(not(feature = "no_optimize"))]
+            optimization_level: OptimizationLevel::Simple,
+            #[cfg(feature = "no_optimize")]
+            optimization_level: (),
+
             allow_if_expr: true,
             allow_switch_expr: true,
             allow_stmt_expr: true,

src/api/run.rs

@@ -30,7 +30,7 @@ impl Engine {
             &mut stream.peekable(),
             &mut state,
             scope,
-            self.optimization_level,
+            self.options.optimization_level,
         )?;
 
         self.run_ast_with_scope(scope, &ast)