137 lines
4.2 KiB
Rust
137 lines
4.2 KiB
Rust
//! Module containing all built-in _packages_ available to Rhai, plus facilities to define custom packages.
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use crate::fn_native::{CallableFunction, IteratorFn, Shared};
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use crate::module::Module;
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use crate::utils::StaticVec;
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use crate::stdlib::any::TypeId;
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pub(crate) mod arithmetic;
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mod array_basic;
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mod eval;
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mod fn_basic;
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mod iter_basic;
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mod logic;
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mod map_basic;
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mod math_basic;
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mod pkg_core;
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mod pkg_std;
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mod string_basic;
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mod string_more;
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mod time_basic;
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pub use arithmetic::ArithmeticPackage;
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#[cfg(not(feature = "no_index"))]
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pub use array_basic::BasicArrayPackage;
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pub use eval::EvalPackage;
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#[cfg(not(feature = "no_function"))]
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pub use fn_basic::BasicFnPackage;
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pub use iter_basic::BasicIteratorPackage;
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pub use logic::LogicPackage;
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#[cfg(not(feature = "no_object"))]
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pub use map_basic::BasicMapPackage;
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pub use math_basic::BasicMathPackage;
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pub use pkg_core::CorePackage;
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pub use pkg_std::StandardPackage;
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pub use string_basic::BasicStringPackage;
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pub use string_more::MoreStringPackage;
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#[cfg(not(feature = "no_std"))]
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pub use time_basic::BasicTimePackage;
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/// Trait that all packages must implement.
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pub trait Package {
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/// Register all the functions in a package into a store.
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fn init(lib: &mut Module);
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/// Retrieve the generic package library from this package.
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fn get(&self) -> PackageLibrary;
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}
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/// A sharable `Module` to facilitate sharing library instances.
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pub type PackageLibrary = Shared<Module>;
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/// Type containing a collection of `PackageLibrary` instances.
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/// All function and type iterator keys in the loaded packages are indexed for fast access.
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#[derive(Clone, Default)]
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pub(crate) struct PackagesCollection(StaticVec<PackageLibrary>);
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impl PackagesCollection {
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/// Add a `PackageLibrary` into the `PackagesCollection`.
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pub fn push(&mut self, package: PackageLibrary) {
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// Later packages override previous ones.
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self.0.insert(0, package);
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}
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/// Does the specified function hash key exist in the `PackagesCollection`?
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pub fn contains_fn(&self, hash: u64) -> bool {
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self.0.iter().any(|p| p.contains_fn(hash))
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}
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/// Get specified function via its hash key.
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pub fn get_fn(&self, hash: u64) -> Option<&CallableFunction> {
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self.0
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.iter()
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.map(|p| p.get_fn(hash))
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.find(|f| f.is_some())
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.flatten()
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}
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/// Does the specified TypeId iterator exist in the `PackagesCollection`?
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pub fn contains_iter(&self, id: TypeId) -> bool {
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self.0.iter().any(|p| p.contains_iter(id))
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}
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/// Get the specified TypeId iterator.
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pub fn get_iter(&self, id: TypeId) -> Option<IteratorFn> {
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self.0
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.iter()
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.map(|p| p.get_iter(id))
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.find(|f| f.is_some())
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.flatten()
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}
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}
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/// Macro that makes it easy to define a _package_ (which is basically a shared module)
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/// and register functions into it.
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///
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/// Functions can be added to the package using the standard module methods such as
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/// `set_fn_2`, `set_fn_3_mut`, `set_fn_0` etc.
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///
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/// # Examples
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///
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/// ```
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/// use rhai::{Dynamic, EvalAltResult};
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/// use rhai::def_package;
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///
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/// fn add(x: i64, y: i64) -> Result<i64, Box<EvalAltResult>> { Ok(x + y) }
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///
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/// def_package!(rhai:MyPackage:"My super-duper package", lib,
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/// {
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/// // Load a binary function with all value parameters.
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/// lib.set_fn_2("my_add", add);
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/// });
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/// ```
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///
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/// The above defines a package named 'MyPackage' with a single function named 'my_add'.
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#[macro_export]
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macro_rules! def_package {
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($root:ident : $package:ident : $comment:expr , $lib:ident , $block:stmt) => {
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#[doc=$comment]
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pub struct $package($root::packages::PackageLibrary);
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impl $root::packages::Package for $package {
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fn get(&self) -> $root::packages::PackageLibrary {
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self.0.clone()
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}
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fn init($lib: &mut $root::Module) {
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$block
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}
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}
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impl $package {
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pub fn new() -> Self {
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let mut module = $root::Module::new_with_capacity(512);
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<Self as $root::packages::Package>::init(&mut module);
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Self(module.into())
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}
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}
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};
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}
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