296 lines
15 KiB
Markdown
296 lines
15 KiB
Markdown
Rhai Release Notes
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==================
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Version 0.18.3
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==============
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Bug fixes
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---------
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* `Engine::compile_expression`, `Engine::eval_expression` etc. no longer parse anonymous functions and closures.
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* Imported modules now work inside closures.
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* Closures that capture now work under `no_object`.
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Version 0.18.2
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==============
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Bug fixes
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---------
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* Fixes bug that prevents calling functions in closures.
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* Fixes bug that erroneously consumes the first argument to a module-qualified function call.
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New features
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------------
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* Adds `Engine::register_get_result`, `Engine::register_set_result`, `Engine::register_indexer_get_result`, `Engine::register_indexer_set_result` API.
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* Adds `Module::combine` to combine two modules.
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* `Engine::parse_json` now also accepts a JSON object starting with `#{`.
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Version 0.18.1
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==============
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This version adds:
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* Anonymous functions (in Rust closure syntax). Simplifies creation of single-use ad-hoc functions.
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* Currying of function pointers.
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* Closures - auto-currying of anonymous functions to capture shared variables from the external scope. Use the `no_closure` feature to disable sharing values and capturing.
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* Binding the `this` pointer in a function pointer `call`.
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* Capturing call scope via `func!(...)` syntax.
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New features
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------------
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* `call` can now be called function-call style for function pointers - this is to handle builds with `no_object`.
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* Reserve language keywords, such as `print`, `eval`, `call`, `this` etc.
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* `x.call(f, ...)` allows binding `x` to `this` for the function referenced by the function pointer `f`.
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* Anonymous functions are supported in the syntax of a Rust closure, e.g. `|x, y, z| x + y - z`.
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* Custom syntax now works even without the `internals` feature.
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* Currying of function pointers is supported via the new `curry` keyword.
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* Automatic currying of anonymous functions to capture shared variables from the external scope.
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* Capturing of the calling scope for function call via the `func!(...)` syntax.
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* `Module::set_indexer_get_set_fn` is added as a shorthand of both `Module::set_indexer_get_fn` and `Module::set_indexer_set_fn`.
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* New `unicode-xid-ident` feature to allow [Unicode Standard Annex #31](http://www.unicode.org/reports/tr31/) for identifiers.
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* `Scope::iter_raw` returns an iterator with a reference to the underlying `Dynamic` value (which may be shared).
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Breaking changes
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----------------
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* Language keywords are now _reserved_ (even when disabled) and they can no longer be used as variable names.
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* Function signature for defining custom syntax is simplified.
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* `Engine::register_raw_fn_XXX` API shortcuts are removed.
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* `PackagesCollection::get_fn`, `PackagesCollection::contains_fn`, `Module::get_fn` and `Module::contains_fn` now take an additional `public_only` parameter indicating whether only public functions are accepted.
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* The iterator returned by `Scope::iter` now contains a clone of the `Dynamic` value (unshared).
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* `Engine::load_package` takes any type that is `Into<PackageLibrary>`.
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* Error in `Engine::register_custom_syntax` is no longer `Box`-ed.
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Housekeeping
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------------
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* Most compilation warnings are eliminated via feature gates.
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Version 0.17.0
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==============
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This version adds:
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* [`serde`](https://crates.io/crates/serde) support for working with `Dynamic` values (particularly _object maps_).
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* Low-level API to register functions.
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* Surgically disable keywords and/or operators in the language.
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* Define custom operators.
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* Extend the language via custom syntax.
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Bug fixes
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---------
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* Fixed method calls in the middle of a dot chain.
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Breaking changes
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----------------
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* `EvalAltResult::ErrorMismatchOutputType` has an extra argument containing the name of the requested type.
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* `Engine::call_fn_dynamic` take an extra argument, allowing a `Dynamic` value to be bound to the `this` pointer.
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* Precedence of the `%` (modulo) operator is lowered to below `<<` ad `>>`. This is to handle the case of `x << 3 % 10`.
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New features
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------------
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* New `serde` feature to allow serializing/deserializing to/from `Dynamic` values using [`serde`](https://crates.io/crates/serde).
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This is particularly useful when converting a Rust `struct` to a `Dynamic` _object map_ and back.
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* `Engine::disable_symbol` to surgically disable keywords and/or operators.
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* `Engine::register_custom_operator` to define a custom operator.
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* `Engine::register_custom_syntax` to define a custom syntax.
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* New low-level API `Engine::register_raw_fn`.
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* New low-level API `Module::set_raw_fn` mirroring `Engine::register_raw_fn`.
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* `AST::clone_functions_only`, `AST::clone_functions_only_filtered` and `AST::clone_statements_only` to clone only part of an `AST`.
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* The boolean `^` (XOR) operator is added.
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* `FnPtr` is exposed as the function pointer type.
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* `rhai::module_resolvers::ModuleResolversCollection` added to try a list of module resolvers.
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* It is now possible to mutate the first argument of a module-qualified function call when the argument is a simple variable (but not a module constant).
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* Many configuration/setting API's now returns `&mut Self` so that the calls can be chained.
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* `String` parameters in functions are supported (but inefficiently).
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Version 0.16.1
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==============
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Bug fix release to fix errors when compiling with features.
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Version 0.16.0
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==============
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The major new feature in this version is OOP - well, poor man's OOP, that is.
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The `README` is officially transferred to [The Rhai Book](https://schungx.github.io/rhai).
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An online [Playground](https://alvinhochun.github.io/rhai-demo/) is available.
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Breaking changes
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----------------
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* The trait function `ModuleResolver::resolve` no longer takes a `Scope` as argument.
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* Functions defined in script now differentiates between using method-call style and normal function-call style.
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The method-call style will bind the object to the `this` parameter instead of consuming the first parameter.
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* Imported modules are no longer stored in the `Scope`. `Scope::push_module` is removed.
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Therefore, cannot rely on module imports to persist across invocations using a `Scope`.
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* `AST::retain_functions` is used for another purpose. The old `AST::retain_functions` is renamed to `AST::clear_statements`.
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New features
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------------
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* Support for _function pointers_ via `Fn(name)` and `Fn.call(...)` syntax - a poor man's first-class function.
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* Support for calling script-defined functions in method-call style with `this` binding to the object.
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* Special support in object maps for OOP.
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* Expanded the `AST` API for fine-tuned manipulation of functions.
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Enhancements
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------------
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* [The Rhai Book](https://schungx.github.io/rhai) is online. Most content in the original `README` was transferred to the Book.
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* New feature `internals` to expose internal data structures (e.g. the AST nodes).
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Version 0.15.1
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==============
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This is a minor release which enables updating indexers (via registered indexer setters) and supports functions
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with `&str` parameters (maps transparently to `ImmutableString`). WASM is also a tested target.
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Bug fix
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-------
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* `let s="abc"; s[1].change_to('X');` now correctly sets the character '`X`' into '`s`' yielding `"aXc"`.
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Breaking changes
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----------------
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* Callback closure passed to `Engine::on_progress` now takes `&u64` instead of `u64` to be consistent with other callback signatures.
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* `Engine::register_indexer` is renamed to `Engine::register_indexer_get`.
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* `Module::set_indexer_fn` is renamed to `Module::set_indexer_get_fn`.
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* The tuple `ParseError` now exposes the internal fields and the `ParseError::error_type` and `ParseError::position` methods are removed. The first tuple field is the `ParseErrorType` and the second tuple field is the `Position`.
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* `Engine::call_fn_dynamic` now takes any type that implements `IntoIterator<Item = Dynamic>`.
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New features
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------------
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* Indexers are now split into getters and setters (which now support updates). The API is split into `Engine::register_indexer_get` and `Engine::register_indexer_set` with `Engine::register_indexer_get_set` being a shorthand. Similarly, `Module::set_indexer_get_fn` and `Module::set_indexer_set_fn` are added.
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* `Engine:register_fn` and `Engine:register_result_fn` accepts functions that take parameters of type `&str` (immutable string slice), which maps directly to `ImmutableString`. This is to avoid needing wrappers for functions taking string parameters.
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* Set maximum limit on data sizes: `Engine::set_max_string_size`, `Engine::set_max_array_size` and `Engine::set_max_map_size`.
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* Supports trailing commas on array literals, object map literals, function definitions and function calls.
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* Enhances support for compiling to WASM.
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Version 0.15.0
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==============
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This version uses immutable strings (`ImmutableString` type) and built-in operator functions (e.g. `+`, `>`, `+=`) to improve speed, plus some bug fixes.
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Regression fix
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--------------
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* Do not optimize script with `eval_expression` - it is assumed to be one-off and short.
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Bug fixes
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---------
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* Indexing with an index or dot expression now works property (it compiled wrongly before).
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For example, `let s = "hello"; s[s.len-1] = 'x';` now works property instead of causing a runtime error.
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* `if` expressions are not supposed to be allowed when compiling for expressions only. This is fixed.
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Breaking changes
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----------------
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* `Engine::compile_XXX` functions now return `ParseError` instead of `Box<ParseError>`.
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* The `RegisterDynamicFn` trait is merged into the `RegisterResultFn` trait which now always returns `Result<Dynamic, Box<EvalAltResult>>`.
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* Default maximum limit on levels of nested function calls is fine-tuned and set to a different value.
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* Some operator functions are now built in (see _Speed enhancements_ below), so they are available even under `Engine::new_raw`.
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* Strings are now immutable. The type `rhai::ImmutableString` is used instead of `std::string::String`. This is to avoid excessive cloning of strings. All native-Rust functions taking string parameters should switch to `rhai::ImmutableString` (which is either `Rc<String>` or `Arc<String>` depending on whether the `sync` feature is used).
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* Native Rust functions registered with the `Engine` also mutates the first argument when called in normal function-call style (previously the first argument will be passed by _value_ if not called in method-call style). Of course, if the first argument is a calculated value (e.g. result of an expression), then mutating it has no effect, but at least it is not cloned.
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* Some built-in methods (e.g. `len` for string, `floor` for `FLOAT`) now have _property_ versions in addition to methods to simplify coding.
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New features
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------------
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* Set limit on maximum level of nesting expressions and statements to avoid panics during parsing.
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* New `EvalPackage` to disable `eval`.
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* `Module::set_getter_fn`, `Module::set_setter_fn` and `Module:set_indexer_fn` to register getter/setter/indexer functions.
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* `Engine::call_fn_dynamic` for more control in calling script functions.
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Speed enhancements
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------------------
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* Common operators (e.g. `+`, `>`, `==`) now call into highly efficient built-in implementations for standard types (i.e. `INT`, `FLOAT`, `bool`, `char`, `()` and `ImmutableString`) if not overridden by a registered function. This yields a 5-10% speed benefit depending on script operator usage. Scripts running tight loops will see significant speed-up.
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* Common assignment operators (e.g. `+=`, `%=`) now call into highly efficient built-in implementations for standard types (i.e. `INT`, `FLOAT`, `bool`, `char`, `()` and `ImmutableString`) if not overridden by a registered function.
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* Implementations of common operators for standard types are removed from the `ArithmeticPackage` and `LogicPackage` (and therefore the `CorePackage`) because they are now always available, even under `Engine::new_raw`.
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* Operator-assignment statements (e.g. `+=`) are now handled directly and much faster.
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* Strings are now _immutable_ and use the `rhai::ImmutableString` type, eliminating large amounts of cloning.
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* For Native Rust functions taking a first `&mut` parameter, the first argument is passed by reference instead of by value, even if not called in method-call style. This allows many functions declared with `&mut` parameter to avoid excessive cloning. For example, if `a` is a large array, getting its length in this manner: `len(a)` used to result in a full clone of `a` before taking the length and throwing the copy away. Now, `a` is simply passed by reference, avoiding the cloning altogether.
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* A custom hasher simply passes through `u64` keys without hashing to avoid function call hash keys (which are by themselves `u64`) being hashed twice.
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Version 0.14.1
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==============
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The major features for this release is modules, script resource limits, and speed improvements
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(mainly due to avoiding allocations).
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New features
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------------
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* Modules and _module resolvers_ allow loading external scripts under a module namespace. A module can contain constant variables, Rust functions and Rhai functions.
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* `export` variables and `private` functions.
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* _Indexers_ for Rust types.
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* Track script evaluation progress and terminate script run.
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* Set limit on maximum number of operations allowed per script run.
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* Set limit on maximum number of modules loaded per script run.
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* A new API, `Engine::compile_scripts_with_scope`, can compile a list of script segments without needing to first concatenate them together into one large string.
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* Stepped `range` function with a custom step.
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Speed improvements
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------------------
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### `StaticVec`
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A script contains many lists - statements in a block, arguments to a function call etc.
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In a typical script, most of these lists tend to be short - e.g. the vast majority of function calls contain
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fewer than 4 arguments, while most statement blocks have fewer than 4-5 statements, with one or two being
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the most common. Before, dynamic `Vec`'s are used to hold these short lists for very brief periods of time,
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causing allocations churn.
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In this version, large amounts of allocations are avoided by converting to a `StaticVec` -
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a list type based on a static array for a small number of items (currently four) -
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wherever possible plus other tricks. Most real-life scripts should see material speed increases.
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### Pre-computed variable lookups
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Almost all variable lookups, as well as lookups in loaded modules, are now pre-computed.
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A variable's name is almost never used to search for the variable in the current scope.
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_Getters_ and _setter_ function names are also pre-computed and cached, so no string allocations are
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performed during a property get/set call.
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### Pre-computed function call hashes
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Lookup of all function calls, including Rust and Rhai ones, are now through pre-computed hashes.
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The function name is no longer used to search for a function, making function call dispatches
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much faster.
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### Large Boxes for expressions and statements
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The expression (`Expr`) and statement (`Stmt`) types are modified so that all of the variants contain only
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one single `Box` to a large allocated structure containing _all_ the fields. This makes the `Expr` and
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`Stmt` types very small (only one single pointer) and improves evaluation speed due to cache efficiency.
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Error handling
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--------------
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Previously, when an error occurs inside a function call, the error position reported is the function
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call site. This makes it difficult to diagnose the actual location of the error within the function.
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A new error variant `EvalAltResult::ErrorInFunctionCall` is added in this version.
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It wraps the internal error returned by the called function, including the error position within the function.
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