Merge pull request #387 from schungx/master

Fix property setter op-assignment bug.

CHANGELOG.md

@@ -1,6 +1,27 @@
 Rhai Release Notes
 ==================
 
+Version 0.19.16
+===============
+
+Bug fixes
+---------
+
+* Property setter op-assignments now work properly.
+
+Breaking changes
+----------------
+
+* `ModuleResolver` trait methods take an additional parameter `source_path` that contains the path of the current environment. This is to facilitate loading other script files always from the current directory.
+* `FileModuleResolver` now resolves relative paths under the source path if there is no base path set.
+* `FileModuleResolver::base_path` now returns `Option<&str>` which is `None` if there is no base path set.
+
+New features
+------------
+
+* `FileModuleResolver` resolves relative paths under the parent path (i.e. the path holding the script that does the loading). This allows seamless cross-loading of scripts from a directory hierarchy instead of having all relative paths load from the current working directory.
+
+
 Version 0.19.15
 ===============
 
@@ -16,12 +37,12 @@ an object map is small.
 `HashMap` and `BTreeMap` have almost identical public API's so this change is unlikely to break
 existing code.
 
-[`SmartString`](https://crates.io/crates/smartstring) is used to store identifiers (which tends to
+[`SmartString`](https://crates.io/crates/smartstring) is used to store identifiers (which tend to
 be short, fewer than 23 characters, and ASCII-based) because they can usually be stored inline.
 `Map` keys now also use [`SmartString`](https://crates.io/crates/smartstring).
 
 In addition, there is now support for line continuation in strings (put `\` at the end of line) as
-well as multi-line literal strings (wrapped by back-ticks: <code>\`...\`</code>).
+well as multi-line literal strings (wrapped by back-ticks: `` `...` ``).
 
 Finally, all function signature/metadata methods are now grouped under the umbrella `metadata` feature.
 This avoids spending precious resources maintaining metadata for functions for the vast majority of
@@ -45,7 +66,7 @@ Breaking changes
 * The _reflections_ API such as `Engine::gen_fn_signatures`, `Module::update_fn_metadata` etc. are put under the `metadata` feature gate.
 * The shebang `#!` is now a reserved symbol.
 * Shebangs at the very beginning of script files are skipped when loading them.
-* [`smartstring`](https://crates.io/crates/smartstring) is used for identifiers by default. Currently, a PR branch is pulled because it breaks on `no-std` builds. The official crate will be used once `smartstring` is fixed to support `no-std`.
+* [`SmartString`](https://crates.io/crates/smartstring) is used for identifiers by default. Currently, a PR branch is pulled for `no-std` builds. The official crate will be used once `SmartString` is fixed to support `no-std`.
 * `Map` is now an alias to `BTreeMap<SmartString, Dynamic>` instead of `HashMap` because most object maps hold few properties.
 * `EvalAltResult::FnWrongDefinition` is renamed `WrongFnDefinition` for consistency.
 

Cargo.toml

@@ -3,7 +3,7 @@ members = [".", "codegen"]
 
 [package]
 name = "rhai"
-version = "0.19.15"
+version = "0.19.16"
 edition = "2018"
 authors = ["Jonathan Turner", "Lukáš Hozda", "Stephen Chung", "jhwgh1968"]
 description = "Embedded scripting for Rust"

README.md

@@ -3,6 +3,7 @@ Rhai - Embedded Scripting for Rust
 
 ![GitHub last commit](https://img.shields.io/github/last-commit/rhaiscript/rhai?logo=github)
 [![Build Status](https://github.com/rhaiscript/rhai/workflows/Build/badge.svg)](https://github.com/rhaiscript/rhai/actions)
+[![stars](https://img.shields.io/github/stars/rhaiscript/rhai?logo=github)](https://github.com/rhaiscript/rhai)
 [![license](https://img.shields.io/crates/l/rhai)](https://github.com/license/rhaiscript/rhai)
 [![crates.io](https://img.shields.io/crates/v/rhai?logo=rust)](https://crates.io/crates/rhai/)
 [![crates.io](https://img.shields.io/crates/d/rhai?logo=rust)](https://crates.io/crates/rhai/)
@@ -34,8 +35,8 @@ Standard features
 * Freely pass Rust values into a script as [variables](https://rhai.rs/book/language/variables.html)/[constants](https://rhai.rs/book/language/constants.html) via an external [`Scope`](https://rhai.rs/book/rust/scope.html) - all clonable Rust types are supported; no need to implement any special trait. Or tap directly into the [variable resolution process](https://rhai.rs/book/engine/var.html).
 * Built-in support for most common [data types](https://rhai.rs/book/language/values-and-types.html) including booleans, [integers](https://rhai.rs/book/language/numbers.html), [floating-point numbers](https://rhai.rs/book/language/numbers.html) (including [`Decimal`](https://crates.io/crates/rust_decimal)), [strings](https://rhai.rs/book/language/strings-chars.html), [Unicode characters](https://rhai.rs/book/language/strings-chars.html), [arrays](https://rhai.rs/book/language/arrays.html) and [object maps](https://rhai.rs/book/language/object-maps.html).
 * Easily [call a script-defined function](https://rhai.rs/book/engine/call-fn.html) from Rust.
-* Relatively little `unsafe` code (yes there are some for performance reasons).
+* Relatively little `unsafe` code (yes there are some for performance reasons), and `unsafe` code is only used for type casting, never to get around the borrow checker.
-* Few dependencies (currently only [`smallvec`](https://crates.io/crates/smallvec), [`num-traits`](https://crates.io/crates/num-traits), [`ahash`](https://crates.io/crates/ahash)) and [`smartstring`](https://crates.io/crates/smartstring)).
+* Few dependencies - currently only [`smallvec`](https://crates.io/crates/smallvec), [`num-traits`](https://crates.io/crates/num-traits), [`ahash`](https://crates.io/crates/ahash) and [`smartstring`](https://crates.io/crates/smartstring).
 * Re-entrant scripting engine can be made `Send + Sync` (via the `sync` feature).
 * Compile once to [AST](https://rhai.rs/book/engine/compile.html) form for repeated evaluations.
 * Scripts are [optimized](https://rhai.rs/book/engine/optimize.html) (useful for template-based machine-generated scripts).

codegen/Cargo.toml

@@ -16,7 +16,7 @@ default = []
 metadata = []
 
 [dev-dependencies]
-rhai = { path = "..", version = "^0.19.15" }
+rhai = { path = "..", version = "0.19" }
 trybuild = "1"
 
 [dependencies]

scripts/fibonacci.rhai

@@ -1,7 +1,7 @@
 // This script calculates the n-th Fibonacci number using a really dumb algorithm
 // to test the speed of the scripting engine.
 
-const target = 30;
+const target = 28;
 
 fn fib(n) {
     if n < 2 {
@@ -11,16 +11,20 @@ fn fib(n) {
     }
 }
 
+print("Running Fibonacci(28) x 5 times...");
 print("Ready... Go!");
 
+let result;
 let now = timestamp();
 
-let result = fib(target);
+for n in range(0, 5) {
+	result = fib(target);
+}
 
 print("Finished. Run time = " + now.elapsed + " seconds.");
 
 print("Fibonacci number #" + target + " = " + result);
 
-if result != 832_040 {
+if result != 317_811 {
-    print("The answer is WRONG! Should be 832,040!");
+    print("The answer is WRONG! Should be 317,811!");
 }

scripts/module.rhai

@@ -1,3 +1,3 @@
-import "scripts/loop";
+import "loop";
 
 print("Module test!");

src/bin/rhai-repl.rs

@@ -4,6 +4,7 @@ use std::{
     env,
     fs::File,
     io::{stdin, stdout, Read, Write},
+    path::Path,
     process::exit,
 };
 
@@ -64,28 +65,39 @@ fn main() {
     #[cfg(not(feature = "no_module"))]
     #[cfg(not(feature = "no_std"))]
     {
-        // Set a file module resolver without caching
-        let mut resolver = rhai::module_resolvers::FileModuleResolver::new();
-        resolver.enable_cache(false);
-        engine.set_module_resolver(resolver);
-
         // Load init scripts
         let mut contents = String::new();
         let mut has_init_scripts = false;
 
         for filename in env::args().skip(1) {
+            let filename = match Path::new(&filename).canonicalize() {
+                Err(err) => {
+                    eprintln!("Error script file path: {}\n{}", filename, err);
+                    exit(1);
+                }
+                Ok(f) => f,
+            };
+
             contents.clear();
 
             let mut f = match File::open(&filename) {
                 Err(err) => {
-                    eprintln!("Error reading script file: {}\n{}", filename, err);
+                    eprintln!(
+                        "Error reading script file: {}\n{}",
+                        filename.to_string_lossy(),
+                        err
+                    );
                     exit(1);
                 }
                 Ok(f) => f,
             };
 
             if let Err(err) = f.read_to_string(&mut contents) {
-                println!("Error reading script file: {}\n{}", filename, err);
+                println!(
+                    "Error reading script file: {}\n{}",
+                    filename.to_string_lossy(),
+                    err
+                );
                 exit(1);
             }
 
@@ -93,10 +105,12 @@ fn main() {
                 .compile(&contents)
                 .map_err(|err| err.into())
                 .and_then(|mut ast| {
-                    ast.set_source(&filename);
+                    ast.set_source(filename.to_string_lossy());
                     Module::eval_ast_as_new(Default::default(), &ast, &engine)
                 }) {
                 Err(err) => {
+                    let filename = filename.to_string_lossy();
+
                     eprintln!("{:=<1$}", "", filename.len());
                     eprintln!("{}", filename);
                     eprintln!("{:=<1$}", "", filename.len());
@@ -112,7 +126,7 @@ fn main() {
 
             has_init_scripts = true;
 
-            println!("Script '{}' loaded.", filename);
+            println!("Script '{}' loaded.", filename.to_string_lossy());
         }
 
         if has_init_scripts {
@@ -124,17 +138,26 @@ fn main() {
     #[cfg(not(feature = "no_optimize"))]
     engine.set_optimization_level(rhai::OptimizationLevel::None);
 
+    // Set a file module resolver without caching
+    #[cfg(not(feature = "no_module"))]
+    {
+        let mut resolver = rhai::module_resolvers::FileModuleResolver::new();
+        resolver.enable_cache(false);
+        engine.set_module_resolver(resolver);
+    }
+
+    // Make Engine immutable
+    let engine = engine;
+
+    // Create scope
     let mut scope = Scope::new();
 
+    // REPL loop
     let mut input = String::new();
     let mut main_ast: AST = Default::default();
     let mut ast_u: AST = Default::default();
     let mut ast: AST = Default::default();
 
-    // Make Engine immutable
-    let engine = engine;
-
-    // REPL loop
     'main_loop: loop {
         print!("rhai-repl> ");
         stdout().flush().expect("couldn't flush stdout");

src/bin/rhai-run.rs

@@ -3,7 +3,7 @@ use rhai::{Engine, EvalAltResult, Position};
 #[cfg(not(feature = "no_optimize"))]
 use rhai::OptimizationLevel;
 
-use std::{env, fs::File, io::Read, process::exit};
+use std::{env, fs::File, io::Read, path::Path, process::exit};
 
 fn eprint_error(input: &str, mut err: EvalAltResult) {
     fn eprint_line(lines: &[&str], pos: Position, err_msg: &str) {
@@ -38,6 +38,14 @@ fn main() {
     let mut contents = String::new();
 
     for filename in env::args().skip(1) {
+        let filename = match Path::new(&filename).canonicalize() {
+            Err(err) => {
+                eprintln!("Error script file path: {}\n{}", filename, err);
+                exit(1);
+            }
+            Ok(f) => f,
+        };
+
         let mut engine = Engine::new();
 
         #[cfg(not(feature = "no_optimize"))]
@@ -45,7 +53,11 @@ fn main() {
 
         let mut f = match File::open(&filename) {
             Err(err) => {
-                eprintln!("Error reading script file: {}\n{}", filename, err);
+                eprintln!(
+                    "Error reading script file: {}\n{}",
+                    filename.to_string_lossy(),
+                    err
+                );
                 exit(1);
             }
             Ok(f) => f,
@@ -54,7 +66,11 @@ fn main() {
         contents.clear();
 
         if let Err(err) = f.read_to_string(&mut contents) {
-            eprintln!("Error reading script file: {}\n{}", filename, err);
+            eprintln!(
+                "Error reading script file: {}\n{}",
+                filename.to_string_lossy(),
+                err
+            );
             exit(1);
         }
 
@@ -65,7 +81,16 @@ fn main() {
             &contents[..]
         };
 
-        if let Err(err) = engine.consume(contents) {
+        if let Err(err) = engine
+            .compile(contents)
+            .map_err(|err| Box::new(err.into()) as Box<EvalAltResult>)
+            .and_then(|mut ast| {
+                ast.set_source(filename.to_string_lossy());
+                engine.consume_ast(&ast)
+            })
+        {
+            let filename = filename.to_string_lossy();
+
             eprintln!("{:=<1$}", "", filename.len());
             eprintln!("{}", filename);
             eprintln!("{:=<1$}", "", filename.len());

src/engine.rs

@@ -645,7 +645,7 @@ impl<'x, 'px> EvalContext<'_, 'x, 'px, '_, '_, '_, '_> {
         self.mods.iter()
     }
     /// _(INTERNALS)_ The current set of modules imported via `import` statements.
-    /// Available under the `internals` feature only.
+    /// Exported under the `internals` feature only.
     #[cfg(feature = "internals")]
     #[cfg(not(feature = "no_module"))]
     #[inline(always)]
@@ -658,7 +658,7 @@ impl<'x, 'px> EvalContext<'_, 'x, 'px, '_, '_, '_, '_> {
         self.lib.iter().cloned()
     }
     /// _(INTERNALS)_ The current set of namespaces containing definitions of all script-defined functions.
-    /// Available under the `internals` feature only.
+    /// Exported under the `internals` feature only.
     #[cfg(feature = "internals")]
     #[inline(always)]
     pub fn namespaces(&self) -> &[&Module] {
@@ -712,12 +712,12 @@ pub struct Engine {
     pub(crate) module_resolver: Box<dyn crate::ModuleResolver>,
 
     /// A map mapping type names to pretty-print names.
-    pub(crate) type_names: BTreeMap<String, String>,
+    pub(crate) type_names: BTreeMap<Identifier, Identifier>,
 
     /// A set of symbols to disable.
-    pub(crate) disabled_symbols: BTreeSet<String>,
+    pub(crate) disabled_symbols: BTreeSet<Identifier>,
     /// A map containing custom keywords and precedence to recognize.
-    pub(crate) custom_keywords: BTreeMap<String, Option<Precedence>>,
+    pub(crate) custom_keywords: BTreeMap<Identifier, Option<Precedence>>,
     /// Custom syntax.
     pub(crate) custom_syntax: BTreeMap<Identifier, CustomSyntax>,
     /// Callback closure for resolving variable access.
@@ -1205,12 +1205,28 @@ impl Engine {
 
                         Ok((val.take_or_clone(), false))
                     }
-                    // xxx.id = ???
+                    // xxx.id op= ???
                     Expr::Property(x) if new_val.is_some() => {
-                        let (_, (setter, hash_set), Ident { pos, .. }) = x.as_ref();
+                        let ((getter, hash_get), (setter, hash_set), Ident { pos, .. }) =
+                            x.as_ref();
+                        let ((mut new_val, new_pos), (op_info, op_pos)) = new_val.unwrap();
+
+                        if op_info.is_some() {
+                            let hash = FnCallHash::from_native(*hash_get);
+                            let mut args = [target.as_mut()];
+                            let (mut orig_val, _) = self.exec_fn_call(
+                                mods, state, lib, getter, hash, &mut args, is_ref, true, *pos,
+                                None, level,
+                            )?;
+                            let obj_ptr = (&mut orig_val).into();
+                            self.eval_op_assignment(
+                                mods, state, lib, op_info, op_pos, obj_ptr, new_val, new_pos,
+                            )?;
+                            new_val = orig_val;
+                        }
+
                         let hash = FnCallHash::from_native(*hash_set);
-                        let mut new_val = new_val;
+                        let mut args = [target.as_mut(), &mut new_val];
-                        let mut args = [target_val, &mut (new_val.as_mut().unwrap().0).0];
                         self.exec_fn_call(
                             mods, state, lib, setter, hash, &mut args, is_ref, true, *pos, None,
                             level,
@@ -2433,19 +2449,22 @@ impl Engine {
                 {
                     use crate::ModuleResolver;
 
+                    let source = state.source.as_ref().map(|s| s.as_str());
                     let expr_pos = expr.position();
 
                     let module = state
                         .resolver
                         .as_ref()
-                        .and_then(|r| match r.resolve(self, &path, expr_pos) {
+                        .and_then(|r| match r.resolve(self, source, &path, expr_pos) {
                             Ok(m) => return Some(Ok(m)),
                             Err(err) => match *err {
                                 EvalAltResult::ErrorModuleNotFound(_, _) => None,
                                 _ => return Some(Err(err)),
                             },
                         })
-                        .unwrap_or_else(|| self.module_resolver.resolve(self, &path, expr_pos))?;
+                        .unwrap_or_else(|| {
+                            self.module_resolver.resolve(self, source, &path, expr_pos)
+                        })?;
 
                     if let Some(name) = export.as_ref().map(|x| x.name.clone()) {
                         if !module.is_indexed() {
@@ -2650,7 +2669,7 @@ impl Engine {
     pub fn map_type_name<'a>(&'a self, name: &'a str) -> &'a str {
         self.type_names
             .get(name)
-            .map(String::as_str)
+            .map(|s| s.as_str())
             .unwrap_or_else(|| map_std_type_name(name))
     }
 

src/engine_api.rs

@@ -317,10 +317,10 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
-    pub fn register_get<T: Variant + Clone, U: Variant + Clone>(
+    pub fn register_get<T: Variant + Clone, V: Variant + Clone>(
         &mut self,
         name: &str,
-        get_fn: impl Fn(&mut T) -> U + SendSync + 'static,
+        get_fn: impl Fn(&mut T) -> V + SendSync + 'static,
     ) -> &mut Self {
         use crate::engine::make_getter;
         self.register_fn(&make_getter(name), get_fn)
@@ -364,10 +364,10 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
-    pub fn register_get_result<T: Variant + Clone, U: Variant + Clone>(
+    pub fn register_get_result<T: Variant + Clone, V: Variant + Clone>(
         &mut self,
         name: &str,
-        get_fn: impl Fn(&mut T) -> Result<U, Box<EvalAltResult>> + SendSync + 'static,
+        get_fn: impl Fn(&mut T) -> Result<V, Box<EvalAltResult>> + SendSync + 'static,
     ) -> &mut Self {
         use crate::engine::make_getter;
         self.register_result_fn(&make_getter(name), get_fn)
@@ -410,10 +410,10 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
-    pub fn register_set<T: Variant + Clone, U: Variant + Clone>(
+    pub fn register_set<T: Variant + Clone, V: Variant + Clone>(
         &mut self,
         name: &str,
-        set_fn: impl Fn(&mut T, U) + SendSync + 'static,
+        set_fn: impl Fn(&mut T, V) + SendSync + 'static,
     ) -> &mut Self {
         use crate::engine::make_setter;
         self.register_fn(&make_setter(name), set_fn)
@@ -459,13 +459,13 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
-    pub fn register_set_result<T: Variant + Clone, U: Variant + Clone>(
+    pub fn register_set_result<T: Variant + Clone, V: Variant + Clone>(
         &mut self,
         name: &str,
-        set_fn: impl Fn(&mut T, U) -> Result<(), Box<EvalAltResult>> + SendSync + 'static,
+        set_fn: impl Fn(&mut T, V) -> Result<(), Box<EvalAltResult>> + SendSync + 'static,
     ) -> &mut Self {
         use crate::engine::make_setter;
-        self.register_result_fn(&make_setter(name), move |obj: &mut T, value: U| {
+        self.register_result_fn(&make_setter(name), move |obj: &mut T, value: V| {
             set_fn(obj, value)
         })
     }
@@ -510,11 +510,11 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_object"))]
     #[inline(always)]
-    pub fn register_get_set<T: Variant + Clone, U: Variant + Clone>(
+    pub fn register_get_set<T: Variant + Clone, V: Variant + Clone>(
         &mut self,
         name: &str,
-        get_fn: impl Fn(&mut T) -> U + SendSync + 'static,
+        get_fn: impl Fn(&mut T) -> V + SendSync + 'static,
-        set_fn: impl Fn(&mut T, U) + SendSync + 'static,
+        set_fn: impl Fn(&mut T, V) + SendSync + 'static,
     ) -> &mut Self {
         self.register_get(name, get_fn).register_set(name, set_fn)
     }
@@ -562,9 +562,9 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_index"))]
     #[inline(always)]
-    pub fn register_indexer_get<T: Variant + Clone, X: Variant + Clone, U: Variant + Clone>(
+    pub fn register_indexer_get<T: Variant + Clone, X: Variant + Clone, V: Variant + Clone>(
         &mut self,
-        get_fn: impl Fn(&mut T, X) -> U + SendSync + 'static,
+        get_fn: impl Fn(&mut T, X) -> V + SendSync + 'static,
     ) -> &mut Self {
         if TypeId::of::<T>() == TypeId::of::<Array>() {
             panic!("Cannot register indexer for arrays.");
@@ -631,10 +631,10 @@ impl Engine {
     pub fn register_indexer_get_result<
         T: Variant + Clone,
         X: Variant + Clone,
-        U: Variant + Clone,
+        V: Variant + Clone,
     >(
         &mut self,
-        get_fn: impl Fn(&mut T, X) -> Result<U, Box<EvalAltResult>> + SendSync + 'static,
+        get_fn: impl Fn(&mut T, X) -> Result<V, Box<EvalAltResult>> + SendSync + 'static,
     ) -> &mut Self {
         if TypeId::of::<T>() == TypeId::of::<Array>() {
             panic!("Cannot register indexer for arrays.");
@@ -696,9 +696,9 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_index"))]
     #[inline(always)]
-    pub fn register_indexer_set<T: Variant + Clone, X: Variant + Clone, U: Variant + Clone>(
+    pub fn register_indexer_set<T: Variant + Clone, X: Variant + Clone, V: Variant + Clone>(
         &mut self,
-        set_fn: impl Fn(&mut T, X, U) + SendSync + 'static,
+        set_fn: impl Fn(&mut T, X, V) + SendSync + 'static,
     ) -> &mut Self {
         if TypeId::of::<T>() == TypeId::of::<Array>() {
             panic!("Cannot register indexer for arrays.");
@@ -766,10 +766,10 @@ impl Engine {
     pub fn register_indexer_set_result<
         T: Variant + Clone,
         X: Variant + Clone,
-        U: Variant + Clone,
+        V: Variant + Clone,
     >(
         &mut self,
-        set_fn: impl Fn(&mut T, X, U) -> Result<(), Box<EvalAltResult>> + SendSync + 'static,
+        set_fn: impl Fn(&mut T, X, V) -> Result<(), Box<EvalAltResult>> + SendSync + 'static,
     ) -> &mut Self {
         if TypeId::of::<T>() == TypeId::of::<Array>() {
             panic!("Cannot register indexer for arrays.");
@@ -787,7 +787,7 @@ impl Engine {
 
         self.register_result_fn(
             crate::engine::FN_IDX_SET,
-            move |obj: &mut T, index: X, value: U| set_fn(obj, index, value),
+            move |obj: &mut T, index: X, value: V| set_fn(obj, index, value),
         )
     }
     /// Short-hand for register both index getter and setter functions for a custom type with the [`Engine`].
@@ -834,10 +834,10 @@ impl Engine {
     /// ```
     #[cfg(not(feature = "no_index"))]
     #[inline(always)]
-    pub fn register_indexer_get_set<T: Variant + Clone, X: Variant + Clone, U: Variant + Clone>(
+    pub fn register_indexer_get_set<T: Variant + Clone, X: Variant + Clone, V: Variant + Clone>(
         &mut self,
-        get_fn: impl Fn(&mut T, X) -> U + SendSync + 'static,
+        get_fn: impl Fn(&mut T, X) -> V + SendSync + 'static,
-        set_fn: impl Fn(&mut T, X, U) -> () + SendSync + 'static,
+        set_fn: impl Fn(&mut T, X, V) -> () + SendSync + 'static,
     ) -> &mut Self {
         self.register_indexer_get(get_fn)
             .register_indexer_set(set_fn)
@@ -1070,7 +1070,7 @@ impl Engine {
 
                 match self
                     .module_resolver
-                    .resolve_ast(self, &path, Position::NONE)
+                    .resolve_ast(self, None, &path, Position::NONE)
                 {
                     Some(Ok(module_ast)) => {
                         collect_imports(&module_ast, &mut resolver, &mut imports)
@@ -1081,6 +1081,7 @@ impl Engine {
 
                 let module = shared_take_or_clone(self.module_resolver.resolve(
                     self,
+                    None,
                     &path,
                     Position::NONE,
                 )?);
@@ -1977,7 +1978,7 @@ impl Engine {
         crate::optimize::optimize_into_ast(self, scope, stmt.into_vec(), lib, optimization_level)
     }
     /// Generate a list of all registered functions.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     ///
     /// Functions from the following sources are included, in order:
     /// 1) Functions registered into the global namespace

src/engine_settings.rs

@@ -1,9 +1,9 @@
 //! Configuration settings for [`Engine`].
 
-use crate::engine::Precedence;
 use crate::stdlib::{format, string::String};
 use crate::token::Token;
 use crate::Engine;
+use crate::{engine::Precedence, Identifier};
 
 #[cfg(not(feature = "unchecked"))]
 use crate::stdlib::num::{NonZeroU64, NonZeroUsize};
@@ -236,7 +236,7 @@ impl Engine {
     /// # }
     /// ```
     #[inline(always)]
-    pub fn disable_symbol(&mut self, symbol: impl Into<String>) -> &mut Self {
+    pub fn disable_symbol(&mut self, symbol: impl Into<Identifier>) -> &mut Self {
         self.disabled_symbols.insert(symbol.into());
         self
     }
@@ -270,7 +270,7 @@ impl Engine {
     /// ```
     pub fn register_custom_operator(
         &mut self,
-        keyword: impl AsRef<str> + Into<String>,
+        keyword: impl AsRef<str> + Into<Identifier>,
         precedence: u8,
     ) -> Result<&mut Self, String> {
         let precedence = Precedence::new(precedence);

src/fn_native.rs

@@ -100,7 +100,7 @@ impl<'a> NativeCallContext<'a> {
         }
     }
     /// _(INTERNALS)_ Create a new [`NativeCallContext`].
-    /// Available under the `internals` feature only.
+    /// Exported under the `internals` feature only.
     #[cfg(feature = "internals")]
     #[cfg(not(feature = "no_module"))]
     #[inline(always)]
@@ -150,7 +150,7 @@ impl<'a> NativeCallContext<'a> {
         self.mods.iter().flat_map(|&m| m.iter_raw())
     }
     /// _(INTERNALS)_ The current set of modules imported via `import` statements.
-    /// Available under the `internals` feature only.
+    /// Exported under the `internals` feature only.
     #[cfg(feature = "internals")]
     #[cfg(not(feature = "no_module"))]
     #[inline(always)]
@@ -163,7 +163,7 @@ impl<'a> NativeCallContext<'a> {
         self.lib.iter().cloned()
     }
     /// _(INTERNALS)_ The current set of namespaces containing definitions of all script-defined functions.
-    /// Available under the `internals` feature only.
+    /// Exported under the `internals` feature only.
     #[cfg(feature = "internals")]
     #[inline(always)]
     pub fn namespaces(&self) -> &[&Module] {

src/fn_register.rs

@@ -60,15 +60,15 @@ pub trait RegisterNativeFunction<Args, Result> {
     /// Get the type ID's of this function's parameters.
     fn param_types() -> Box<[TypeId]>;
     /// Get the type names of this function's parameters.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     #[cfg(feature = "metadata")]
     fn param_names() -> Box<[&'static str]>;
     /// Get the type ID of this function's return value.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     #[cfg(feature = "metadata")]
     fn return_type() -> TypeId;
     /// Get the type name of this function's return value.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     #[cfg(feature = "metadata")]
     fn return_type_name() -> &'static str;
 }

src/module/mod.rs

@@ -67,7 +67,7 @@ pub struct FuncInfo {
 
 impl FuncInfo {
     /// Generate a signature of the function.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     #[cfg(feature = "metadata")]
     pub fn gen_signature(&self) -> String {
         let mut sig = format!("{}(", self.name);
@@ -363,7 +363,7 @@ impl Module {
     }
 
     /// Generate signatures for all the non-private functions in the [`Module`].
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     #[cfg(feature = "metadata")]
     #[inline(always)]
     pub fn gen_fn_signatures(&self) -> impl Iterator<Item = String> + '_ {
@@ -605,7 +605,7 @@ impl Module {
     }
 
     /// Update the metadata (parameter names/types and return type) of a registered function.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     ///
     /// The [`u64`] hash is returned by the [`set_native_fn`][Module::set_native_fn] call.
     ///

src/module/resolvers/collection.rs

@@ -111,11 +111,12 @@ impl ModuleResolver for ModuleResolversCollection {
     fn resolve(
         &self,
         engine: &Engine,
+        source_path: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Result<Shared<Module>, Box<EvalAltResult>> {
         for resolver in self.0.iter() {
-            match resolver.resolve(engine, path, pos) {
+            match resolver.resolve(engine, source_path, path, pos) {
                 Ok(module) => return Ok(module),
                 Err(err) => match *err {
                     EvalAltResult::ErrorModuleNotFound(_, _) => continue,

src/module/resolvers/dummy.rs

@@ -40,6 +40,7 @@ impl ModuleResolver for DummyModuleResolver {
     fn resolve(
         &self,
         _: &Engine,
+        _: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Result<Shared<Module>, Box<EvalAltResult>> {

src/module/resolvers/file.rs

@@ -3,9 +3,10 @@ use crate::stdlib::{
     collections::BTreeMap,
     io::Error as IoError,
     path::{Path, PathBuf},
-    string::String,
 };
-use crate::{Engine, EvalAltResult, Module, ModuleResolver, Position, Shared};
+use crate::{Engine, EvalAltResult, Identifier, Module, ModuleResolver, Position, Shared};
+
+pub const RHAI_SCRIPT_EXTENSION: &str = "rhai";
 
 /// A [module][Module] resolution service that loads [module][Module] script files from the file system.
 ///
@@ -39,8 +40,8 @@ use crate::{Engine, EvalAltResult, Module, ModuleResolver, Position, Shared};
 /// ```
 #[derive(Debug)]
 pub struct FileModuleResolver {
-    base_path: PathBuf,
+    base_path: Option<PathBuf>,
-    extension: String,
+    extension: Identifier,
     cache_enabled: bool,
 
     #[cfg(not(feature = "sync"))]
@@ -52,11 +53,33 @@ pub struct FileModuleResolver {
 impl Default for FileModuleResolver {
     #[inline(always)]
     fn default() -> Self {
-        Self::new_with_path(PathBuf::default())
+        Self::new()
     }
 }
 
 impl FileModuleResolver {
+    /// Create a new [`FileModuleResolver`] with the current directory as base path.
+    ///
+    /// The default extension is `.rhai`.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// use rhai::Engine;
+    /// use rhai::module_resolvers::FileModuleResolver;
+    ///
+    /// // Create a new 'FileModuleResolver' loading scripts from the current directory
+    /// // with file extension '.rhai' (the default).
+    /// let resolver = FileModuleResolver::new();
+    ///
+    /// let mut engine = Engine::new();
+    /// engine.set_module_resolver(resolver);
+    /// ```
+    #[inline(always)]
+    pub fn new() -> Self {
+        Self::new_with_extension(RHAI_SCRIPT_EXTENSION)
+    }
+
     /// Create a new [`FileModuleResolver`] with a specific base path.
     ///
     /// The default extension is `.rhai`.
@@ -76,7 +99,31 @@ impl FileModuleResolver {
     /// ```
     #[inline(always)]
     pub fn new_with_path(path: impl Into<PathBuf>) -> Self {
-        Self::new_with_path_and_extension(path, "rhai")
+        Self::new_with_path_and_extension(path, RHAI_SCRIPT_EXTENSION)
+    }
+
+    /// Create a new [`FileModuleResolver`] with a file extension.
+    ///
+    /// # Example
+    ///
+    /// ```
+    /// use rhai::Engine;
+    /// use rhai::module_resolvers::FileModuleResolver;
+    ///
+    /// // Create a new 'FileModuleResolver' loading scripts with file extension '.rhai' (the default).
+    /// let resolver = FileModuleResolver::new_with_extension("rhai");
+    ///
+    /// let mut engine = Engine::new();
+    /// engine.set_module_resolver(resolver);
+    /// ```
+    #[inline(always)]
+    pub fn new_with_extension(extension: impl Into<Identifier>) -> Self {
+        Self {
+            base_path: None,
+            extension: extension.into(),
+            cache_enabled: true,
+            cache: Default::default(),
+        }
     }
 
     /// Create a new [`FileModuleResolver`] with a specific base path and file extension.
@@ -97,47 +144,25 @@ impl FileModuleResolver {
     #[inline(always)]
     pub fn new_with_path_and_extension(
         path: impl Into<PathBuf>,
-        extension: impl Into<String>,
+        extension: impl Into<Identifier>,
     ) -> Self {
         Self {
-            base_path: path.into(),
+            base_path: Some(path.into()),
             extension: extension.into(),
             cache_enabled: true,
             cache: Default::default(),
         }
     }
 
-    /// Create a new [`FileModuleResolver`] with the current directory as base path.
-    ///
-    /// The default extension is `.rhai`.
-    ///
-    /// # Example
-    ///
-    /// ```
-    /// use rhai::Engine;
-    /// use rhai::module_resolvers::FileModuleResolver;
-    ///
-    /// // Create a new 'FileModuleResolver' loading scripts from the current directory
-    /// // with file extension '.rhai' (the default).
-    /// let resolver = FileModuleResolver::new();
-    ///
-    /// let mut engine = Engine::new();
-    /// engine.set_module_resolver(resolver);
-    /// ```
-    #[inline(always)]
-    pub fn new() -> Self {
-        Default::default()
-    }
-
     /// Get the base path for script files.
     #[inline(always)]
-    pub fn base_path(&self) -> &Path {
+    pub fn base_path(&self) -> Option<&Path> {
-        self.base_path.as_ref()
+        self.base_path.as_ref().map(PathBuf::as_ref)
     }
     /// Set the base path for script files.
     #[inline(always)]
     pub fn set_base_path(&mut self, path: impl Into<PathBuf>) -> &mut Self {
-        self.base_path = path.into();
+        self.base_path = Some(path.into());
         self
     }
 
@@ -149,7 +174,7 @@ impl FileModuleResolver {
 
     /// Set the script file extension.
     #[inline(always)]
-    pub fn set_extension(&mut self, extension: impl Into<String>) -> &mut Self {
+    pub fn set_extension(&mut self, extension: impl Into<Identifier>) -> &mut Self {
         self.extension = extension.into();
         self
     }
@@ -168,12 +193,12 @@ impl FileModuleResolver {
 
     /// Is a particular path cached?
     #[inline(always)]
-    pub fn is_cached(&self, path: &str) -> bool {
+    pub fn is_cached(&self, path: &str, source_path: Option<&str>) -> bool {
         if !self.cache_enabled {
             return false;
         }
 
-        let file_path = self.get_file_path(path);
+        let file_path = self.get_file_path(path, source_path);
 
         #[cfg(not(feature = "sync"))]
         return self.cache.borrow_mut().contains_key(&file_path);
@@ -192,8 +217,12 @@ impl FileModuleResolver {
     ///
     /// The next time this path is resolved, the script file will be loaded once again.
     #[inline(always)]
-    pub fn clear_cache_for_path(&mut self, path: &str) -> Option<Shared<Module>> {
+    pub fn clear_cache_for_path(
-        let file_path = self.get_file_path(path);
+        &mut self,
+        path: &str,
+        source_path: Option<&str>,
+    ) -> Option<Shared<Module>> {
+        let file_path = self.get_file_path(path, source_path);
 
         #[cfg(not(feature = "sync"))]
         return self
@@ -210,10 +239,23 @@ impl FileModuleResolver {
             .map(|(_, v)| v);
     }
     /// Construct a full file path.
-    fn get_file_path(&self, path: &str) -> PathBuf {
+    fn get_file_path(&self, path: &str, source_path: Option<&str>) -> PathBuf {
-        let mut file_path = self.base_path.clone();
+        let path = Path::new(path);
+
+        let mut file_path;
+
+        if path.is_relative() {
+            file_path = self
+                .base_path
+                .clone()
+                .or_else(|| source_path.map(|p| p.into()))
+                .unwrap_or_default();
             file_path.push(path);
-        file_path.set_extension(&self.extension); // Force extension
+        } else {
+            file_path = path.into();
+        }
+
+        file_path.set_extension(self.extension.as_str()); // Force extension
         file_path
     }
 }
@@ -222,11 +264,16 @@ impl ModuleResolver for FileModuleResolver {
     fn resolve(
         &self,
         engine: &Engine,
+        source_path: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Result<Shared<Module>, Box<EvalAltResult>> {
+        // Load relative paths from source if there is no base path specified
+        let source_path =
+            source_path.and_then(|p| Path::new(p).parent().map(|p| p.to_string_lossy()));
+
         // Construct the script file path
-        let file_path = self.get_file_path(path);
+        let file_path = self.get_file_path(path, source_path.as_ref().map(|p| p.as_ref()));
 
         // See if it is cached
         if self.is_cache_enabled() {
@@ -276,11 +323,12 @@ impl ModuleResolver for FileModuleResolver {
     fn resolve_ast(
         &self,
         engine: &Engine,
+        source_path: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Option<Result<crate::AST, Box<EvalAltResult>>> {
         // Construct the script file path
-        let file_path = self.get_file_path(path);
+        let file_path = self.get_file_path(path, source_path);
 
         // Load the script file and compile it
         match engine.compile_file(file_path).map_err(|err| match *err {

src/module/resolvers/mod.rs

@@ -25,6 +25,7 @@ pub trait ModuleResolver: SendSync {
     fn resolve(
         &self,
         engine: &Engine,
+        source_path: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Result<Shared<Module>, Box<EvalAltResult>>;
@@ -42,6 +43,7 @@ pub trait ModuleResolver: SendSync {
     fn resolve_ast(
         &self,
         engine: &Engine,
+        source_path: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Option<Result<AST, Box<EvalAltResult>>> {

src/module/resolvers/stat.rs

@@ -1,5 +1,5 @@
-use crate::stdlib::{boxed::Box, collections::BTreeMap, ops::AddAssign, string::String};
+use crate::stdlib::{boxed::Box, collections::BTreeMap, ops::AddAssign};
-use crate::{Engine, EvalAltResult, Module, ModuleResolver, Position, Shared};
+use crate::{Engine, EvalAltResult, Identifier, Module, ModuleResolver, Position, Shared};
 
 /// A static [module][Module] resolution service that serves [modules][Module] added into it.
 ///
@@ -19,7 +19,7 @@ use crate::{Engine, EvalAltResult, Module, ModuleResolver, Position, Shared};
 /// engine.set_module_resolver(resolver);
 /// ```
 #[derive(Debug, Clone, Default)]
-pub struct StaticModuleResolver(BTreeMap<String, Shared<Module>>);
+pub struct StaticModuleResolver(BTreeMap<Identifier, Shared<Module>>);
 
 impl StaticModuleResolver {
     /// Create a new [`StaticModuleResolver`].
@@ -44,7 +44,7 @@ impl StaticModuleResolver {
     }
     /// Add a [module][Module] keyed by its path.
     #[inline(always)]
-    pub fn insert(&mut self, path: impl Into<String>, mut module: Module) {
+    pub fn insert(&mut self, path: impl Into<Identifier>, mut module: Module) {
         module.build_index();
         self.0.insert(path.into(), module.into());
     }
@@ -70,13 +70,13 @@ impl StaticModuleResolver {
     }
     /// Get a mutable iterator of all the modules.
     #[inline(always)]
-    pub fn into_iter(self) -> impl Iterator<Item = (String, Shared<Module>)> {
+    pub fn into_iter(self) -> impl Iterator<Item = (Identifier, Shared<Module>)> {
         self.0.into_iter()
     }
     /// Get an iterator of all the [module][Module] paths.
     #[inline(always)]
     pub fn paths(&self) -> impl Iterator<Item = &str> {
-        self.0.keys().map(String::as_str)
+        self.0.keys().map(|s| s.as_str())
     }
     /// Get an iterator of all the [modules][Module].
     #[inline(always)]
@@ -115,6 +115,7 @@ impl ModuleResolver for StaticModuleResolver {
     fn resolve(
         &self,
         _: &Engine,
+        _: Option<&str>,
         path: &str,
         pos: Position,
     ) -> Result<Shared<Module>, Box<EvalAltResult>> {

src/packages/string_basic.rs

@@ -10,8 +10,8 @@ use crate::Array;
 #[cfg(not(feature = "no_object"))]
 use crate::Map;
 
-#[cfg(any(not(feature = "no_index"), not(feature = "no_object")))]
+pub const FUNC_TO_STRING: &'static str = "to_string";
-const FUNC_TO_DEBUG: &'static str = "to_debug";
+pub const FUNC_TO_DEBUG: &'static str = "to_debug";
 
 def_package!(crate:BasicStringPackage:"Basic string utilities, including printing.", lib, {
     combine_with_exported_module!(lib, "print_debug", print_debug_functions);
@@ -19,9 +19,8 @@ def_package!(crate:BasicStringPackage:"Basic string utilities, including printin
 
 // Register print and debug
 
-#[cfg(any(not(feature = "no_index"), not(feature = "no_object")))]
 #[inline(always)]
-fn print_with_func(
+pub fn print_with_func(
     fn_name: &str,
     ctx: &NativeCallContext,
     value: &mut Dynamic,
@@ -39,17 +38,25 @@ fn print_with_func(
 mod print_debug_functions {
     use crate::ImmutableString;
 
-    #[rhai_fn(name = "print", name = "to_string", pure)]
+    #[rhai_fn(name = "print", pure)]
-    pub fn print_generic(item: &mut Dynamic) -> ImmutableString {
+    pub fn print_generic(ctx: NativeCallContext, item: &mut Dynamic) -> ImmutableString {
-        item.to_string().into()
+        print_with_func(FUNC_TO_STRING, &ctx, item)
     }
-    #[rhai_fn(name = "debug", name = "to_debug", pure)]
+    #[rhai_fn(name = "to_string", pure)]
-    pub fn debug_generic(item: &mut Dynamic) -> ImmutableString {
+    pub fn to_string_generic(ctx: NativeCallContext, item: &mut Dynamic) -> ImmutableString {
-        format!("{:?}", item).into()
+        ctx.engine().map_type_name(&item.to_string()).into()
+    }
+    #[rhai_fn(name = "debug", pure)]
+    pub fn debug_generic(ctx: NativeCallContext, item: &mut Dynamic) -> ImmutableString {
+        print_with_func(FUNC_TO_DEBUG, &ctx, item)
+    }
+    #[rhai_fn(name = "to_debug", pure)]
+    pub fn to_debug_generic(ctx: NativeCallContext, item: &mut Dynamic) -> ImmutableString {
+        ctx.engine().map_type_name(&format!("{:?}", item)).into()
     }
     #[rhai_fn(name = "print", name = "debug")]
     pub fn print_empty_string() -> ImmutableString {
-        "".to_string().into()
+        Default::default()
     }
     #[rhai_fn(name = "print", name = "to_string")]
     pub fn print_string(s: ImmutableString) -> ImmutableString {

src/packages/string_more.rs

@@ -6,6 +6,8 @@ use crate::stdlib::{
 };
 use crate::{def_package, Dynamic, ImmutableString, StaticVec, INT};
 
+use super::string_basic::{print_with_func, FUNC_TO_STRING};
+
 def_package!(crate:MoreStringPackage:"Additional string utilities, including string building.", lib, {
     combine_with_exported_module!(lib, "string", string_functions);
 
@@ -21,22 +23,30 @@ mod string_functions {
     use crate::ImmutableString;
 
     #[rhai_fn(name = "+", name = "append")]
-    pub fn add_append(string: &str, item: Dynamic) -> ImmutableString {
+    pub fn add_append(ctx: NativeCallContext, string: &str, mut item: Dynamic) -> ImmutableString {
-        format!("{}{}", string, item).into()
+        let s = print_with_func(FUNC_TO_STRING, &ctx, &mut item);
+        format!("{}{}", string, s).into()
     }
     #[rhai_fn(name = "+", pure)]
-    pub fn add_prepend(item: &mut Dynamic, string: &str) -> ImmutableString {
+    pub fn add_prepend(
-        format!("{}{}", item, string).into()
+        ctx: NativeCallContext,
+        item: &mut Dynamic,
+        string: &str,
+    ) -> ImmutableString {
+        let s = print_with_func(FUNC_TO_STRING, &ctx, item);
+        format!("{}{}", s, string).into()
     }
 
     #[rhai_fn(name = "+")]
-    pub fn add_append_unit(string: ImmutableString, _x: ()) -> ImmutableString {
+    pub fn add_append_unit(string: ImmutableString, _item: ()) -> ImmutableString {
         string
     }
     #[rhai_fn(name = "+")]
-    pub fn add_prepend_unit(_x: (), string: ImmutableString) -> ImmutableString {
+    pub fn add_prepend_unit(_item: (), string: ImmutableString) -> ImmutableString {
         string
     }
+    #[rhai_fn(name = "+=")]
+    pub fn add_append_assign_unit(_string: &mut ImmutableString, _item: ()) {}
 
     #[rhai_fn(name = "len", get = "len")]
     pub fn len(string: &str) -> INT {

src/parser.rs

@@ -1621,7 +1621,7 @@ fn parse_binary_op(
             Token::Custom(c) => state
                 .engine
                 .custom_keywords
-                .get(c)
+                .get(c.as_str())
                 .cloned()
                 .ok_or_else(|| PERR::Reserved(c.clone()).into_err(*current_pos))?,
             Token::Reserved(c) if !is_valid_identifier(c.chars()) => {
@@ -1646,7 +1646,7 @@ fn parse_binary_op(
             Token::Custom(c) => state
                 .engine
                 .custom_keywords
-                .get(c)
+                .get(c.as_str())
                 .cloned()
                 .ok_or_else(|| PERR::Reserved(c.clone()).into_err(*next_pos))?,
             Token::Reserved(c) if !is_valid_identifier(c.chars()) => {
@@ -1753,7 +1753,7 @@ fn parse_binary_op(
                 if state
                     .engine
                     .custom_keywords
-                    .get(&s)
+                    .get(s.as_str())
                     .map_or(false, Option::is_some) =>
             {
                 let hash = calc_fn_hash(empty(), &s, 2);

src/serde/metadata.rs

@@ -212,7 +212,7 @@ impl From<&crate::Module> for ModuleMetadata {
 impl Engine {
     /// _(METADATA)_ Generate a list of all functions (including those defined in an
     /// [`AST`][crate::AST]) in JSON format.
-    /// Available under the `metadata` feature only.
+    /// Exported under the `metadata` feature only.
     ///
     /// Functions from the following sources are included:
     /// 1) Functions defined in an [`AST`][crate::AST]
@@ -221,9 +221,10 @@ impl Engine {
     /// 4) Functions in global modules (optional)
     pub fn gen_fn_metadata_with_ast_to_json(
         &self,
-        _ast: &AST,
+        ast: &AST,
         include_global: bool,
     ) -> serde_json::Result<String> {
+        let _ast = ast;
         let mut global: ModuleMetadata = Default::default();
 
         if include_global {

src/token.rs

@@ -1828,7 +1828,7 @@ impl<'a> Iterator for TokenIterator<'a> {
             None => return None,
             // Reserved keyword/symbol
             Some((Token::Reserved(s), pos)) => (match
-                (s.as_str(), self.engine.custom_keywords.contains_key(&s))
+                (s.as_str(), self.engine.custom_keywords.contains_key(s.as_str()))
             {
                 ("===", false) => Token::LexError(LERR::ImproperSymbol(s,
                     "'===' is not a valid operator. This is not JavaScript! Should it be '=='?".to_string(),
@@ -1869,7 +1869,7 @@ impl<'a> Iterator for TokenIterator<'a> {
                 (_, false) => Token::Reserved(s),
             }, pos),
             // Custom keyword
-            Some((Token::Identifier(s), pos)) if self.engine.custom_keywords.contains_key(&s) => {
+            Some((Token::Identifier(s), pos)) if self.engine.custom_keywords.contains_key(s.as_str()) => {
                 (Token::Custom(s), pos)
             }
             // Custom standard keyword/symbol - must be disabled

tests/functions.rs

@@ -1,84 +1,37 @@
 #![cfg(not(feature = "no_function"))]
-use rhai::{Engine, EvalAltResult, FnNamespace, Module, NativeCallContext, ParseErrorType, INT};
+use rhai::{Engine, EvalAltResult, FnNamespace, Module, ParseErrorType, Shared, INT};
 
+#[cfg(not(feature = "no_object"))]
+#[cfg(not(feature = "sync"))]
 #[test]
-fn test_functions() -> Result<(), Box<EvalAltResult>> {
+fn test_functions_trait_object() -> Result<(), Box<EvalAltResult>> {
-    let engine = Engine::new();
+    trait TestTrait {
-
+        fn greet(&self) -> INT;
-    assert_eq!(engine.eval::<INT>("fn add(x, n) { x + n } add(40, 2)")?, 42);
-
-    assert_eq!(
-        engine.eval::<INT>("fn add(x, n,) { x + n } add(40, 2,)")?,
-        42
-    );
-
-    assert_eq!(
-        engine.eval::<INT>("fn add(x, n) { x + n } let a = 40; add(a, 2); a")?,
-        40
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>("fn add(n) { this + n } let x = 40; x.add(2)")?,
-        42
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>("fn add(n) { this += n; } let x = 40; x.add(2); x")?,
-        42
-    );
-
-    assert_eq!(engine.eval::<INT>("fn mul2(x) { x * 2 } mul2(21)")?, 42);
-
-    assert_eq!(
-        engine.eval::<INT>("fn mul2(x) { x *= 2 } let a = 21; mul2(a); a")?,
-        21
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>("fn mul2() { this * 2 } let x = 21; x.mul2()")?,
-        42
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>("fn mul2() { this *= 2; } let x = 21; x.mul2(); x")?,
-        42
-    );
-
-    Ok(())
     }
 
-#[cfg(not(feature = "no_module"))]
+    #[derive(Debug, Clone)]
-#[cfg(not(feature = "unchecked"))]
+    struct ABC(INT);
-#[test]
+
-fn test_functions_context() -> Result<(), Box<EvalAltResult>> {
+    impl TestTrait for ABC {
+        fn greet(&self) -> INT {
+            self.0
+        }
+    }
+
+    type MySharedTestTrait = Shared<dyn TestTrait>;
+
     let mut engine = Engine::new();
 
-    engine.set_max_modules(40);
+    engine
-    engine.register_fn("test", |context: NativeCallContext, x: INT| {
+        .register_type_with_name::<MySharedTestTrait>("MySharedTestTrait")
-        context.engine().max_modules() as INT + x
+        .register_fn("new_ts", || Shared::new(ABC(42)) as MySharedTestTrait)
-    });
+        .register_fn("greet", |x: MySharedTestTrait| x.greet());
 
-    assert_eq!(engine.eval::<INT>("test(2)")?, 42);
-
-    Ok(())
-}
-
-#[test]
-fn test_functions_params() -> Result<(), Box<EvalAltResult>> {
-    let engine = Engine::new();
-
-    // Expect duplicated parameters error
     assert_eq!(
-        *engine
+        engine.eval::<String>("type_of(new_ts())")?,
-            .compile("fn hello(x, x) { x }")
+        "MySharedTestTrait"
-            .expect_err("should be error")
-            .0,
-        ParseErrorType::FnDuplicatedParam("hello".to_string(), "x".to_string())
     );
+    assert_eq!(engine.eval::<INT>("let x = new_ts(); greet(x)")?, 42);
 
     Ok(())
 }
@@ -110,152 +63,3 @@ fn test_functions_namespaces() -> Result<(), Box<EvalAltResult>> {
 
     Ok(())
 }
-
-#[test]
-fn test_function_pointers() -> Result<(), Box<EvalAltResult>> {
-    let engine = Engine::new();
-
-    assert_eq!(engine.eval::<String>(r#"type_of(Fn("abc"))"#)?, "Fn");
-
-    assert_eq!(
-        engine.eval::<INT>(
-            r#"
-                fn foo(x) { 40 + x }
-
-                let f = Fn("foo");
-                call(f, 2)
-            "#
-        )?,
-        42
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>(
-            r#"
-                fn foo(x) { 40 + x }
-
-                let fn_name = "f";
-                fn_name += "oo";
-
-                let f = Fn(fn_name);
-                f.call(2)
-            "#
-        )?,
-        42
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert!(matches!(
-        *engine.eval::<INT>(r#"let f = Fn("abc"); f.call(0)"#).expect_err("should error"),
-        EvalAltResult::ErrorFunctionNotFound(f, _) if f.starts_with("abc (")
-    ));
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>(
-            r#"
-                fn foo(x) { 40 + x }
-
-                let x = #{ action: Fn("foo") };
-                x.action.call(2)
-            "#
-        )?,
-        42
-    );
-
-    #[cfg(not(feature = "no_object"))]
-    assert_eq!(
-        engine.eval::<INT>(
-            r#"
-                fn foo(x) { this.data += x; }
-
-                let x = #{ data: 40, action: Fn("foo") };
-                x.action(2);
-                x.data
-            "#
-        )?,
-        42
-    );
-
-    Ok(())
-}
-
-#[test]
-#[cfg(not(feature = "no_closure"))]
-fn test_function_captures() -> Result<(), Box<EvalAltResult>> {
-    let engine = Engine::new();
-
-    assert_eq!(
-        engine.eval::<INT>(
-            r#"
-                fn foo(y) { x += y; x }
-
-                let x = 41;
-                let y = 999;
-
-                foo!(1) + x
-            "#
-        )?,
-        83
-    );
-
-    assert!(engine
-        .eval::<INT>(
-            r#"
-                fn foo(y) { x += y; x }
-
-                let x = 41;
-                let y = 999;
-
-                foo(1) + x
-            "#
-        )
-        .is_err());
-
-    #[cfg(not(feature = "no_object"))]
-    assert!(matches!(
-        *engine
-            .compile(
-                r#"
-                    fn foo() { this += x; }
-
-                    let x = 41;
-                    let y = 999;
-
-                    y.foo!();
-                "#
-            )
-            .expect_err("should error")
-            .0,
-        ParseErrorType::MalformedCapture(_)
-    ));
-
-    Ok(())
-}
-
-#[test]
-fn test_function_is_def() -> Result<(), Box<EvalAltResult>> {
-    let engine = Engine::new();
-
-    assert!(engine.eval::<bool>(
-        r#"
-            fn foo(x) { x + 1 }
-            is_def_fn("foo", 1)
-        "#
-    )?);
-    assert!(!engine.eval::<bool>(
-        r#"
-            fn foo(x) { x + 1 }
-            is_def_fn("bar", 1)
-        "#
-    )?);
-    assert!(!engine.eval::<bool>(
-        r#"
-            fn foo(x) { x + 1 }
-            is_def_fn("foo", 0)
-        "#
-    )?);
-
-    Ok(())
-}

tests/get_set.rs

@@ -128,3 +128,36 @@ fn test_get_set_chain() -> Result<(), Box<EvalAltResult>> {
 
     Ok(())
 }
+
+#[test]
+fn test_get_set_op_assignment() -> Result<(), Box<EvalAltResult>> {
+    #[derive(Clone, Debug, Eq, PartialEq)]
+    struct Num(INT);
+
+    impl Num {
+        fn get(&mut self) -> INT {
+            self.0
+        }
+        fn set(&mut self, x: INT) {
+            self.0 = x;
+        }
+    }
+
+    let mut engine = Engine::new();
+
+    engine
+        .register_type::<Num>()
+        .register_fn("new_ts", || Num(40))
+        .register_get_set("v", Num::get, Num::set);
+
+    assert_eq!(
+        engine.eval::<Num>("let a = new_ts(); a.v = a.v + 2; a")?,
+        Num(42)
+    );
+    assert_eq!(
+        engine.eval::<Num>("let a = new_ts(); a.v += 2; a")?,
+        Num(42)
+    );
+
+    Ok(())
+}

tests/internal_fn.rs

@@ -18,11 +18,54 @@ fn test_internal_fn() -> Result<(), Box<EvalAltResult>> {
 
     assert_eq!(engine.eval::<INT>("fn bob() { return 4; 5 } bob()")?, 4);
 
+    assert_eq!(engine.eval::<INT>("fn add(x, n) { x + n } add(40, 2)")?, 42);
+
+    assert_eq!(
+        engine.eval::<INT>("fn add(x, n,) { x + n } add(40, 2,)")?,
+        42
+    );
+
+    assert_eq!(
+        engine.eval::<INT>("fn add(x, n) { x + n } let a = 40; add(a, 2); a")?,
+        40
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>("fn add(n) { this + n } let x = 40; x.add(2)")?,
+        42
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>("fn add(n) { this += n; } let x = 40; x.add(2); x")?,
+        42
+    );
+
+    assert_eq!(engine.eval::<INT>("fn mul2(x) { x * 2 } mul2(21)")?, 42);
+
+    assert_eq!(
+        engine.eval::<INT>("fn mul2(x) { x *= 2 } let a = 21; mul2(a); a")?,
+        21
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>("fn mul2() { this * 2 } let x = 21; x.mul2()")?,
+        42
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>("fn mul2() { this *= 2; } let x = 21; x.mul2(); x")?,
+        42
+    );
+
     Ok(())
 }
 
 #[test]
-fn test_big_internal_fn() -> Result<(), Box<EvalAltResult>> {
+fn test_internal_fn_big() -> Result<(), Box<EvalAltResult>> {
     let engine = Engine::new();
 
     assert_eq!(
@@ -73,3 +116,168 @@ fn test_internal_fn_overloading() -> Result<(), Box<EvalAltResult>> {
 
     Ok(())
 }
+
+#[test]
+fn test_internal_fn_params() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    // Expect duplicated parameters error
+    assert_eq!(
+        *engine
+            .compile("fn hello(x, x) { x }")
+            .expect_err("should be error")
+            .0,
+        ParseErrorType::FnDuplicatedParam("hello".to_string(), "x".to_string())
+    );
+
+    Ok(())
+}
+
+#[test]
+fn test_function_pointers() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    assert_eq!(engine.eval::<String>(r#"type_of(Fn("abc"))"#)?, "Fn");
+
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(x) { 40 + x }
+
+                let f = Fn("foo");
+                call(f, 2)
+            "#
+        )?,
+        42
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(x) { 40 + x }
+
+                let fn_name = "f";
+                fn_name += "oo";
+
+                let f = Fn(fn_name);
+                f.call(2)
+            "#
+        )?,
+        42
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert!(matches!(
+        *engine.eval::<INT>(r#"let f = Fn("abc"); f.call(0)"#).expect_err("should error"),
+        EvalAltResult::ErrorFunctionNotFound(f, _) if f.starts_with("abc (")
+    ));
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(x) { 40 + x }
+
+                let x = #{ action: Fn("foo") };
+                x.action.call(2)
+            "#
+        )?,
+        42
+    );
+
+    #[cfg(not(feature = "no_object"))]
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(x) { this.data += x; }
+
+                let x = #{ data: 40, action: Fn("foo") };
+                x.action(2);
+                x.data
+            "#
+        )?,
+        42
+    );
+
+    Ok(())
+}
+
+#[test]
+#[cfg(not(feature = "no_closure"))]
+fn test_internal_fn_captures() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(y) { x += y; x }
+
+                let x = 41;
+                let y = 999;
+
+                foo!(1) + x
+            "#
+        )?,
+        83
+    );
+
+    assert!(engine
+        .eval::<INT>(
+            r#"
+                fn foo(y) { x += y; x }
+
+                let x = 41;
+                let y = 999;
+
+                foo(1) + x
+            "#
+        )
+        .is_err());
+
+    #[cfg(not(feature = "no_object"))]
+    assert!(matches!(
+        *engine
+            .compile(
+                r#"
+                    fn foo() { this += x; }
+
+                    let x = 41;
+                    let y = 999;
+
+                    y.foo!();
+                "#
+            )
+            .expect_err("should error")
+            .0,
+        ParseErrorType::MalformedCapture(_)
+    ));
+
+    Ok(())
+}
+
+#[test]
+fn test_internal_fn_is_def() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    assert!(engine.eval::<bool>(
+        r#"
+            fn foo(x) { x + 1 }
+            is_def_fn("foo", 1)
+        "#
+    )?);
+    assert!(!engine.eval::<bool>(
+        r#"
+            fn foo(x) { x + 1 }
+            is_def_fn("bar", 1)
+        "#
+    )?);
+    assert!(!engine.eval::<bool>(
+        r#"
+            fn foo(x) { x + 1 }
+            is_def_fn("foo", 0)
+        "#
+    )?);
+
+    Ok(())
+}

tests/native.rs

@@ -1,8 +1,24 @@
 use rhai::{Dynamic, Engine, EvalAltResult, NativeCallContext, INT};
 use std::any::TypeId;
 
+#[cfg(not(feature = "no_module"))]
+#[cfg(not(feature = "unchecked"))]
 #[test]
 fn test_native_context() -> Result<(), Box<EvalAltResult>> {
+    let mut engine = Engine::new();
+
+    engine.set_max_modules(40);
+    engine.register_fn("test", |context: NativeCallContext, x: INT| {
+        context.engine().max_modules() as INT + x
+    });
+
+    assert_eq!(engine.eval::<INT>("test(2)")?, 42);
+
+    Ok(())
+}
+
+#[test]
+fn test_native_context_fn_name() -> Result<(), Box<EvalAltResult>> {
     fn add_double(
         context: NativeCallContext,
         args: &mut [&mut Dynamic],
@@ -21,14 +37,14 @@ fn test_native_context() -> Result<(), Box<EvalAltResult>> {
             add_double,
         )
         .register_raw_fn(
-            "adbl",
+            "append_x2",
             &[TypeId::of::<INT>(), TypeId::of::<INT>()],
             add_double,
         );
 
     assert_eq!(engine.eval::<String>("add_double(40, 1)")?, "add_double_42");
 
-    assert_eq!(engine.eval::<String>("adbl(40, 1)")?, "adbl_42");
+    assert_eq!(engine.eval::<String>("append_x2(40, 1)")?, "append_x2_42");
 
     Ok(())
 }

tests/string.rs

@@ -222,6 +222,41 @@ fn test_string_substring() -> Result<(), Box<EvalAltResult>> {
     Ok(())
 }
 
+#[cfg(not(feature = "no_object"))]
+#[test]
+fn test_string_format() -> Result<(), Box<EvalAltResult>> {
+    #[derive(Debug, Clone)]
+    struct TestStruct {
+        field: i64,
+    }
+
+    let mut engine = Engine::new();
+
+    engine
+        .register_type_with_name::<TestStruct>("TestStruct")
+        .register_fn("new_ts", || TestStruct { field: 42 })
+        .register_fn("to_string", |ts: TestStruct| format!("TS={}", ts.field))
+        .register_fn("to_debug", |ts: TestStruct| {
+            format!("!!!TS={}!!!", ts.field)
+        });
+
+    assert_eq!(
+        engine.eval::<String>(r#"let x = new_ts(); "foo" + x"#)?,
+        "fooTS=42"
+    );
+    assert_eq!(
+        engine.eval::<String>(r#"let x = new_ts(); x + "foo""#)?,
+        "TS=42foo"
+    );
+    #[cfg(not(feature = "no_index"))]
+    assert_eq!(
+        engine.eval::<String>(r#"let x = [new_ts()]; "foo" + x"#)?,
+        "foo[!!!TS=42!!!]"
+    );
+
+    Ok(())
+}
+
 #[test]
 fn test_string_fn() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();