Use bit-flags for options.

src/api/compile.rs

@@ -201,11 +201,7 @@ impl Engine {
         scope: &Scope,
         scripts: impl AsRef<[S]>,
     ) -> ParseResult<AST> {
-        self.compile_with_scope_and_optimization_level(
-            scope,
-            scripts,
-            self.options.optimization_level,
-        )
+        self.compile_with_scope_and_optimization_level(scope, scripts, self.optimization_level)
     }
     /// Join a list of strings and compile into an [`AST`] using own scope at a specific optimization level.
     ///
@@ -296,6 +292,6 @@ impl Engine {
 
         let mut peekable = stream.peekable();
         let mut state = ParseState::new(self, scope, tokenizer_control);
-        self.parse_global_expr(&mut peekable, &mut state, self.options.optimization_level)
+        self.parse_global_expr(&mut peekable, &mut state, self.optimization_level)
     }
 }

src/api/eval.rs

@@ -67,7 +67,7 @@ impl Engine {
         let ast = self.compile_with_scope_and_optimization_level(
             scope,
             &[script],
-            self.options.optimization_level,
+            self.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.options.optimization_level = optimization_level;
+        self.optimization_level = optimization_level;
         self
     }
 
@@ -20,7 +20,7 @@ impl Engine {
     #[inline(always)]
     #[must_use]
     pub const fn optimization_level(&self) -> OptimizationLevel {
-        self.options.optimization_level
+        self.optimization_level
     }
 
     /// Optimize the [`AST`] with constants defined in an external Scope.

src/api/options.rs

@@ -1,62 +1,47 @@
 //! Settings for [`Engine`]'s language options.
 
-use crate::{Engine, OptimizationLevel};
+use crate::Engine;
+use bitflags::bitflags;
 #[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?
-    pub allow_switch_expr: bool,
-    /// Is statement-expression allowed?
-    pub allow_stmt_expr: bool,
-    /// Is anonymous function allowed?
-    #[cfg(not(feature = "no_function"))]
-    pub allow_anonymous_fn: bool,
-    /// Is looping allowed?
-    pub allow_looping: bool,
-    /// Is variables shadowing allowed?
-    pub allow_shadowing: bool,
-    /// Strict variables mode?
-    pub strict_var: bool,
-    /// Raise error if an object map property does not exist?
-    /// Returns `()` if `false`.
-    #[cfg(not(feature = "no_object"))]
-    pub fail_on_invalid_map_property: bool,
-}
-
-impl LanguageOptions {
-    /// Create a new [`Options`] with default values.
-    #[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,
-            #[cfg(not(feature = "no_function"))]
-            allow_anonymous_fn: true,
-            allow_looping: true,
-            strict_var: false,
-            allow_shadowing: true,
-            #[cfg(not(feature = "no_object"))]
-            fail_on_invalid_map_property: false,
-        }
+bitflags! {
+    /// Bit-flags containing all language options for the [`Engine`].
+    pub struct LangOptions: u8 {
+        /// Is `if`-expression allowed?
+        const IF_EXPR = 0b_00000001;
+        /// Is `switch` expression allowed?
+        const SWITCH_EXPR = 0b_00000010;
+        /// Is statement-expression allowed?
+        const STMT_EXPR = 0b_00000100;
+        /// Is anonymous function allowed?
+        #[cfg(not(feature = "no_function"))]
+        const ANON_FN = 0b_00001000;
+        /// Is looping allowed?
+        const LOOPING = 0b_00010000;
+        /// Is variables shadowing allowed?
+        const SHADOW = 0b_00100000;
+        /// Strict variables mode?
+        const STRICT_VAR = 0b_01000000;
+        /// Raise error if an object map property does not exist?
+        /// Returns `()` if `false`.
+        #[cfg(not(feature = "no_object"))]
+        const FAIL_ON_INVALID_MAP_PROPERTY = 0b_10000000;
     }
 }
 
-impl Default for LanguageOptions {
-    fn default() -> Self {
-        Self::new()
+impl LangOptions {
+    /// Create a new [`Options`] with default values.
+    #[inline(always)]
+    pub fn new() -> Self {
+        Self::IF_EXPR | Self::SWITCH_EXPR | Self::STMT_EXPR | Self::LOOPING | Self::SHADOW | {
+            #[cfg(not(feature = "no_function"))]
+            {
+                Self::ANON_FN
+            }
+            #[cfg(feature = "no_function")]
+            0
+        }
     }
 }
 
@@ -65,34 +50,34 @@ impl Engine {
     /// Default is `true`.
     #[inline(always)]
     pub const fn allow_if_expression(&self) -> bool {
-        self.options.allow_if_expr
+        self.options.contains(LangOptions::IF_EXPR)
     }
     /// Set whether `if`-expression is allowed.
     #[inline(always)]
     pub fn set_allow_if_expression(&mut self, enable: bool) {
-        self.options.allow_if_expr = enable;
+        self.options.set(LangOptions::IF_EXPR, enable)
     }
     /// Is `switch` expression allowed?
     /// Default is `true`.
     #[inline(always)]
     pub const fn allow_switch_expression(&self) -> bool {
-        self.options.allow_switch_expr
+        self.options.contains(LangOptions::SWITCH_EXPR)
     }
     /// Set whether `switch` expression is allowed.
     #[inline(always)]
     pub fn set_allow_switch_expression(&mut self, enable: bool) {
-        self.options.allow_switch_expr = enable;
+        self.options.set(LangOptions::SWITCH_EXPR, enable);
     }
     /// Is statement-expression allowed?
     /// Default is `true`.
     #[inline(always)]
     pub const fn allow_statement_expression(&self) -> bool {
-        self.options.allow_stmt_expr
+        self.options.contains(LangOptions::STMT_EXPR)
     }
     /// Set whether statement-expression is allowed.
     #[inline(always)]
     pub fn set_allow_statement_expression(&mut self, enable: bool) {
-        self.options.allow_stmt_expr = enable;
+        self.options.set(LangOptions::STMT_EXPR, enable);
     }
     /// Is anonymous function allowed?
     /// Default is `true`.
@@ -101,7 +86,7 @@ impl Engine {
     #[cfg(not(feature = "no_function"))]
     #[inline(always)]
     pub const fn allow_anonymous_fn(&self) -> bool {
-        self.options.allow_anonymous_fn
+        self.options.contains(LangOptions::ANON_FN)
     }
     /// Set whether anonymous function is allowed.
     ///
@@ -109,40 +94,40 @@ impl Engine {
     #[cfg(not(feature = "no_function"))]
     #[inline(always)]
     pub fn set_allow_anonymous_fn(&mut self, enable: bool) {
-        self.options.allow_anonymous_fn = enable;
+        self.options.set(LangOptions::ANON_FN, enable);
     }
     /// Is looping allowed?
     /// Default is `true`.
     #[inline(always)]
     pub const fn allow_looping(&self) -> bool {
-        self.options.allow_looping
+        self.options.contains(LangOptions::LOOPING)
     }
     /// Set whether looping is allowed.
     #[inline(always)]
     pub fn set_allow_looping(&mut self, enable: bool) {
-        self.options.allow_looping = enable;
+        self.options.set(LangOptions::LOOPING, enable);
     }
     /// Is variables shadowing allowed?
     /// Default is `true`.
     #[inline(always)]
     pub const fn allow_shadowing(&self) -> bool {
-        self.options.allow_shadowing
+        self.options.contains(LangOptions::SHADOW)
     }
     /// Set whether variables shadowing is allowed.
     #[inline(always)]
     pub fn set_allow_shadowing(&mut self, enable: bool) {
-        self.options.allow_shadowing = enable;
+        self.options.set(LangOptions::SHADOW, enable);
     }
     /// Is strict variables mode enabled?
     /// Default is `false`.
     #[inline(always)]
     pub const fn strict_variables(&self) -> bool {
-        self.options.strict_var
+        self.options.contains(LangOptions::STRICT_VAR)
     }
     /// Set whether strict variables mode is enabled.
     #[inline(always)]
     pub fn set_strict_variables(&mut self, enable: bool) {
-        self.options.strict_var = enable;
+        self.options.set(LangOptions::STRICT_VAR, enable);
     }
     /// Raise error if an object map property does not exist?
     /// Default is `false`.
@@ -151,7 +136,8 @@ impl Engine {
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
     pub const fn fail_on_invalid_map_property(&self) -> bool {
-        self.options.fail_on_invalid_map_property
+        self.options
+            .contains(LangOptions::FAIL_ON_INVALID_MAP_PROPERTY)
     }
     /// Set whether to raise error if an object map property does not exist.
     ///
@@ -159,6 +145,7 @@ impl Engine {
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
     pub fn set_fail_on_invalid_map_property(&mut self, enable: bool) {
-        self.options.fail_on_invalid_map_property = enable;
+        self.options
+            .set(LangOptions::FAIL_ON_INVALID_MAP_PROPERTY, enable);
     }
 }

src/api/run.rs

@@ -26,11 +26,7 @@ impl Engine {
             self.lex_raw(&scripts, self.token_mapper.as_ref().map(Box::as_ref));
         let mut state = ParseState::new(self, scope, tokenizer_control);
 
-        let ast = self.parse(
-            &mut stream.peekable(),
-            &mut state,
-            self.options.optimization_level,
-        )?;
+        let ast = self.parse(&mut stream.peekable(), &mut state, self.optimization_level)?;
 
         self.run_ast_with_scope(scope, &ast)
     }