Consolidate callbacks.

src/api.rs

@@ -1163,7 +1163,7 @@ impl Engine {
     ///
     /// let mut engine = Engine::new();
     ///
-    /// engine.on_progress(move |ops| {
+    /// engine.on_progress(move |&ops| {
     ///     if ops > 10000 {
     ///         false
     ///     } else if ops % 800 == 0 {
@@ -1182,7 +1182,7 @@ impl Engine {
     /// # Ok(())
     /// # }
     /// ```
-    pub fn on_progress(&mut self, callback: impl Fn(u64) -> bool + SendSync + 'static) {
+    pub fn on_progress(&mut self, callback: impl Fn(&u64) -> bool + SendSync + 'static) {
         self.progress = Some(Box::new(callback));
     }
 

src/engine.rs

@@ -3,7 +3,7 @@
 use crate::any::{Dynamic, Union};
 use crate::calc_fn_hash;
 use crate::error::ParseErrorType;
-use crate::fn_native::{CallableFunction, FnCallArgs, Shared};
+use crate::fn_native::{CallableFunction, Callback, FnCallArgs, Shared};
 use crate::module::{resolvers, Module, ModuleResolver};
 use crate::optimize::OptimizationLevel;
 use crate::packages::{CorePackage, Package, PackageLibrary, PackagesCollection, StandardPackage};
@@ -302,26 +302,12 @@ pub struct Engine {
     /// A hashmap mapping type names to pretty-print names.
     pub(crate) type_names: HashMap<String, String>,
 
-    /// Closure for implementing the `print` command.
-    #[cfg(not(feature = "sync"))]
-    pub(crate) print: Box<dyn Fn(&str) + 'static>,
-    /// Closure for implementing the `print` command.
-    #[cfg(feature = "sync")]
-    pub(crate) print: Box<dyn Fn(&str) + Send + Sync + 'static>,
-
-    /// Closure for implementing the `debug` command.
-    #[cfg(not(feature = "sync"))]
-    pub(crate) debug: Box<dyn Fn(&str) + 'static>,
-    /// Closure for implementing the `debug` command.
-    #[cfg(feature = "sync")]
-    pub(crate) debug: Box<dyn Fn(&str) + Send + Sync + 'static>,
-
-    /// Closure for progress reporting.
-    #[cfg(not(feature = "sync"))]
-    pub(crate) progress: Option<Box<dyn Fn(u64) -> bool + 'static>>,
-    /// Closure for progress reporting.
-    #[cfg(feature = "sync")]
-    pub(crate) progress: Option<Box<dyn Fn(u64) -> bool + Send + Sync + 'static>>,
+    /// Callback closure for implementing the `print` command.
+    pub(crate) print: Callback<str, ()>,
+    /// Callback closure for implementing the `debug` command.
+    pub(crate) debug: Callback<str, ()>,
+    /// Callback closure for progress reporting.
+    pub(crate) progress: Option<Callback<u64, bool>>,
 
     /// Optimize the AST after compilation.
     pub(crate) optimization_level: OptimizationLevel,
@@ -2012,7 +1998,7 @@ impl Engine {
 
         // Report progress - only in steps
         if let Some(progress) = &self.progress {
-            if !progress(state.operations) {
+            if !progress(&state.operations) {
                 // Terminate script if progress returns false
                 return Err(Box::new(EvalAltResult::ErrorTerminated(Position::none())));
             }

src/fn_native.rs

@@ -57,6 +57,11 @@ pub type FnAny = dyn Fn(&mut FnCallArgs) -> Result<Dynamic, Box<EvalAltResult>>
 
 pub type IteratorFn = fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>>;
 
+#[cfg(not(feature = "sync"))]
+pub type Callback<T, R> = Box<dyn Fn(&T) -> R + 'static>;
+#[cfg(feature = "sync")]
+pub type Callback<T, R> = Box<dyn Fn(&T) -> R + Send + Sync + 'static>;
+
 /// A type encapsulating a function callable by Rhai.
 #[derive(Clone)]
 pub enum CallableFunction {

src/scope.rs

@@ -175,7 +175,7 @@ impl<'a> Scope<'a> {
     ///
     /// Modules are used for accessing member variables, functions and plugins under a namespace.
     #[cfg(not(feature = "no_module"))]
-    pub fn push_module<K: Into<Cow<'a, str>>>(&mut self, name: K, mut value: Module) {
+    pub fn push_module<K: Into<Cow<'a, str>>>(&mut self, name: K, value: Module) {
         self.push_module_internal(name, value);
     }
 

src/token.rs

@@ -198,6 +198,7 @@ pub enum Token {
     XOrAssign,
     ModuloAssign,
     PowerOfAssign,
+    #[cfg(not(feature = "no_function"))]
     Private,
     Import,
     #[cfg(not(feature = "no_module"))]
@@ -284,6 +285,7 @@ impl Token {
                 ModuloAssign => "%=",
                 PowerOf => "~",
                 PowerOfAssign => "~=",
+                #[cfg(not(feature = "no_function"))]
                 Private => "private",
                 Import => "import",
                 #[cfg(not(feature = "no_module"))]
@@ -757,6 +759,7 @@ impl<'a> TokenIterator<'a> {
                             "throw" => Token::Throw,
                             "for" => Token::For,
                             "in" => Token::In,
+                            #[cfg(not(feature = "no_function"))]
                             "private" => Token::Private,
                             "import" => Token::Import,
                             #[cfg(not(feature = "no_module"))]