1266 lines
41 KiB
Rust
1266 lines
41 KiB
Rust
//! Helper module which defines the `Any` trait to to allow dynamic value handling.
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use crate::fn_native::{FnPtr, SendSync};
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use crate::parser::{ImmutableString, INT};
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use crate::r#unsafe::{unsafe_cast_box, unsafe_try_cast};
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#[cfg(not(feature = "no_closure"))]
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use crate::fn_native::{shared_try_take, Shared};
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#[cfg(not(feature = "no_float"))]
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use crate::parser::FLOAT;
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#[cfg(not(feature = "no_index"))]
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use crate::engine::Array;
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#[cfg(not(feature = "no_object"))]
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use crate::engine::Map;
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use crate::stdlib::{
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any::{type_name, Any, TypeId},
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boxed::Box,
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fmt,
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ops::{Deref, DerefMut},
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string::String,
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};
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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use crate::stdlib::{
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cell::{Ref, RefCell, RefMut},
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rc::Rc,
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};
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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use crate::stdlib::sync::{Arc, RwLock, RwLockReadGuard, RwLockWriteGuard};
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#[cfg(not(feature = "no_object"))]
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use crate::stdlib::collections::HashMap;
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#[cfg(not(feature = "no_index"))]
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use crate::stdlib::vec::Vec;
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#[cfg(not(feature = "no_std"))]
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#[cfg(not(target_arch = "wasm32"))]
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use crate::stdlib::time::Instant;
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#[cfg(not(feature = "no_std"))]
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#[cfg(target_arch = "wasm32")]
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use instant::Instant;
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mod private {
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use crate::fn_native::SendSync;
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use crate::stdlib::any::Any;
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/// A sealed trait that prevents other crates from implementing [`Variant`].
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///
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/// [`Variant`]: super::Variant
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pub trait Sealed {}
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impl<T: Any + Clone + SendSync> Sealed for T {}
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}
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/// Trait to represent any type.
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///
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/// Currently, `Variant` is not `Send` nor `Sync`, so it can practically be any type.
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/// Turn on the `sync` feature to restrict it to only types that implement `Send + Sync`.
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#[cfg(not(feature = "sync"))]
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pub trait Variant: Any + private::Sealed {
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/// Convert this `Variant` trait object to `&dyn Any`.
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fn as_any(&self) -> &dyn Any;
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/// Convert this `Variant` trait object to `&mut dyn Any`.
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fn as_mut_any(&mut self) -> &mut dyn Any;
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/// Convert this `Variant` trait object to an `Any` trait object.
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fn as_box_any(self: Box<Self>) -> Box<dyn Any>;
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/// Get the name of this type.
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fn type_name(&self) -> &'static str;
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/// Convert into `Dynamic`.
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fn into_dynamic(self) -> Dynamic;
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/// Clone into `Dynamic`.
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fn clone_into_dynamic(&self) -> Dynamic;
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}
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/// Trait to represent any type.
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///
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/// `From<_>` is implemented for `i64` (`i32` if `only_i32`), `f64` (if not `no_float`),
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/// `bool`, `String`, `char`, `Vec<T>` (into `Array`) and `HashMap<String, T>` (into `Map`).
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#[cfg(feature = "sync")]
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pub trait Variant: Any + Send + Sync + private::Sealed {
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/// Convert this `Variant` trait object to `&dyn Any`.
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fn as_any(&self) -> &dyn Any;
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/// Convert this `Variant` trait object to `&mut dyn Any`.
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fn as_mut_any(&mut self) -> &mut dyn Any;
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/// Convert this `Variant` trait object to an `Any` trait object.
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fn as_box_any(self: Box<Self>) -> Box<dyn Any>;
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/// Get the name of this type.
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fn type_name(&self) -> &'static str;
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/// Convert into `Dynamic`.
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fn into_dynamic(self) -> Dynamic;
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/// Clone into `Dynamic`.
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fn clone_into_dynamic(&self) -> Dynamic;
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}
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impl<T: Any + Clone + SendSync> Variant for T {
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fn as_any(&self) -> &dyn Any {
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self
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}
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fn as_mut_any(&mut self) -> &mut dyn Any {
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self
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}
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fn as_box_any(self: Box<Self>) -> Box<dyn Any> {
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self
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}
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fn type_name(&self) -> &'static str {
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type_name::<T>()
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}
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fn into_dynamic(self) -> Dynamic {
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Dynamic::from(self)
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}
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fn clone_into_dynamic(&self) -> Dynamic {
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Dynamic::from(self.clone())
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}
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}
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impl dyn Variant {
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/// Is this `Variant` a specific type?
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#[inline(always)]
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pub fn is<T: Any>(&self) -> bool {
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TypeId::of::<T>() == self.type_id()
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}
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}
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/// Dynamic type containing any value.
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pub struct Dynamic(pub(crate) Union);
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/// Internal `Dynamic` representation.
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///
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/// Most variants are boxed to reduce the size.
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pub enum Union {
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Unit(()),
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Bool(bool),
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Str(ImmutableString),
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Char(char),
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Int(INT),
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#[cfg(not(feature = "no_float"))]
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Float(FLOAT),
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#[cfg(not(feature = "no_index"))]
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Array(Box<Array>),
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#[cfg(not(feature = "no_object"))]
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Map(Box<Map>),
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FnPtr(Box<FnPtr>),
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Variant(Box<Box<dyn Variant>>),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Shared(Shared<RefCell<Dynamic>>),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Shared(Shared<RwLock<Dynamic>>),
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}
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/// Underlying `Variant` read guard for `Dynamic`.
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///
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/// This data structure provides transparent interoperability between
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/// normal `Dynamic` and shared Dynamic values.
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#[derive(Debug)]
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pub struct DynamicReadLock<'d, T: Variant + Clone>(DynamicReadLockInner<'d, T>);
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/// Different types of read guards for `DynamicReadLock`.
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#[derive(Debug)]
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enum DynamicReadLockInner<'d, T: Variant + Clone> {
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/// A simple reference to a non-shared value.
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Reference(&'d T),
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/// A read guard to a shared `RefCell`.
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Guard(Ref<'d, Dynamic>),
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/// A read guard to a shared `RwLock`.
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Guard(RwLockReadGuard<'d, Dynamic>),
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}
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impl<'d, T: Variant + Clone> Deref for DynamicReadLock<'d, T> {
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type Target = T;
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#[inline(always)]
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fn deref(&self) -> &Self::Target {
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match &self.0 {
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DynamicReadLockInner::Reference(reference) => *reference,
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// Unwrapping is safe because all checking is already done in its constructor
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#[cfg(not(feature = "no_closure"))]
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DynamicReadLockInner::Guard(guard) => guard.downcast_ref().unwrap(),
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}
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}
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}
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/// Underlying `Variant` write guard for `Dynamic`.
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///
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/// This data structure provides transparent interoperability between
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/// normal `Dynamic` and shared Dynamic values.
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#[derive(Debug)]
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pub struct DynamicWriteLock<'d, T: Variant + Clone>(DynamicWriteLockInner<'d, T>);
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/// Different types of write guards for `DynamicReadLock`.
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#[derive(Debug)]
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enum DynamicWriteLockInner<'d, T: Variant + Clone> {
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/// A simple mutable reference to a non-shared value.
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Reference(&'d mut T),
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/// A write guard to a shared `RefCell`.
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Guard(RefMut<'d, Dynamic>),
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/// A write guard to a shared `RwLock`.
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Guard(RwLockWriteGuard<'d, Dynamic>),
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}
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impl<'d, T: Variant + Clone> Deref for DynamicWriteLock<'d, T> {
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type Target = T;
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#[inline(always)]
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fn deref(&self) -> &Self::Target {
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match &self.0 {
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DynamicWriteLockInner::Reference(reference) => *reference,
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// Unwrapping is safe because all checking is already done in its constructor
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#[cfg(not(feature = "no_closure"))]
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DynamicWriteLockInner::Guard(guard) => guard.downcast_ref().unwrap(),
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}
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}
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}
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impl<'d, T: Variant + Clone> DerefMut for DynamicWriteLock<'d, T> {
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#[inline(always)]
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fn deref_mut(&mut self) -> &mut Self::Target {
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match &mut self.0 {
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DynamicWriteLockInner::Reference(reference) => *reference,
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// Unwrapping is safe because all checking is already done in its constructor
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#[cfg(not(feature = "no_closure"))]
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DynamicWriteLockInner::Guard(guard) => guard.downcast_mut().unwrap(),
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}
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}
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}
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impl Dynamic {
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/// Does this `Dynamic` hold a variant data type
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/// instead of one of the support system primitive types?
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#[inline(always)]
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pub fn is_variant(&self) -> bool {
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match self.0 {
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Union::Variant(_) => true,
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_ => false,
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}
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}
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/// Does this `Dynamic` hold a shared data type
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/// instead of one of the supported system primitive types?
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#[inline(always)]
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pub fn is_shared(&self) -> bool {
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match self.0 {
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#[cfg(not(feature = "no_closure"))]
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Union::Shared(_) => true,
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_ => false,
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}
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}
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/// Is the value held by this `Dynamic` a particular type?
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///
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/// If the `Dynamic` is a Shared variant checking is performed on
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/// top of it's internal value.
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#[inline(always)]
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pub fn is<T: Variant + Clone>(&self) -> bool {
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let mut target_type_id = TypeId::of::<T>();
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if target_type_id == TypeId::of::<String>() {
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target_type_id = TypeId::of::<ImmutableString>();
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}
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self.type_id() == target_type_id
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}
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/// Get the TypeId of the value held by this `Dynamic`.
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///
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/// # Panics or Deadlocks When Value is Shared
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///
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/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
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/// Otherwise, this call panics if the data is currently borrowed for write.
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pub fn type_id(&self) -> TypeId {
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match &self.0 {
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Union::Unit(_) => TypeId::of::<()>(),
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Union::Bool(_) => TypeId::of::<bool>(),
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Union::Str(_) => TypeId::of::<ImmutableString>(),
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Union::Char(_) => TypeId::of::<char>(),
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Union::Int(_) => TypeId::of::<INT>(),
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#[cfg(not(feature = "no_float"))]
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Union::Float(_) => TypeId::of::<FLOAT>(),
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#[cfg(not(feature = "no_index"))]
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Union::Array(_) => TypeId::of::<Array>(),
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#[cfg(not(feature = "no_object"))]
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Union::Map(_) => TypeId::of::<Map>(),
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Union::FnPtr(_) => TypeId::of::<FnPtr>(),
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Union::Variant(value) => (***value).type_id(),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Union::Shared(cell) => (*cell.borrow()).type_id(),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Union::Shared(cell) => (*cell.read().unwrap()).type_id(),
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}
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}
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/// Get the name of the type of the value held by this `Dynamic`.
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///
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/// # Panics or Deadlocks When Value is Shared
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///
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/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
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/// Otherwise, this call panics if the data is currently borrowed for write.
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pub fn type_name(&self) -> &'static str {
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match &self.0 {
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Union::Unit(_) => "()",
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Union::Bool(_) => "bool",
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Union::Str(_) => "string",
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Union::Char(_) => "char",
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Union::Int(_) => type_name::<INT>(),
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#[cfg(not(feature = "no_float"))]
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Union::Float(_) => type_name::<FLOAT>(),
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#[cfg(not(feature = "no_index"))]
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Union::Array(_) => "array",
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#[cfg(not(feature = "no_object"))]
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Union::Map(_) => "map",
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Union::FnPtr(_) => "Fn",
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#[cfg(not(feature = "no_std"))]
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Union::Variant(value) if value.is::<Instant>() => "timestamp",
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Union::Variant(value) => (***value).type_name(),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Union::Shared(cell) => cell
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.try_borrow()
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.map(|v| (*v).type_name())
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.unwrap_or("<shared>"),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Union::Shared(cell) => (*cell.read().unwrap()).type_name(),
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}
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}
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}
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/// Map the name of a standard type into a friendly form.
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#[inline]
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pub(crate) fn map_std_type_name(name: &str) -> &str {
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if name == type_name::<String>() {
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"string"
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} else if name == type_name::<ImmutableString>() {
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"string"
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} else if name == type_name::<&str>() {
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"string"
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} else if name == type_name::<FnPtr>() {
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"Fn"
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} else {
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#[cfg(not(feature = "no_std"))]
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if name == type_name::<Instant>() {
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return "timestamp";
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}
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#[cfg(not(feature = "no_index"))]
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if name == type_name::<Array>() {
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return "array";
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}
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#[cfg(not(feature = "no_object"))]
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if name == type_name::<Map>() {
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return "map";
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}
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name
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}
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}
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impl fmt::Display for Dynamic {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.0 {
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Union::Unit(_) => write!(f, ""),
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Union::Bool(value) => fmt::Display::fmt(value, f),
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Union::Str(value) => fmt::Display::fmt(value, f),
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Union::Char(value) => fmt::Display::fmt(value, f),
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Union::Int(value) => fmt::Display::fmt(value, f),
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#[cfg(not(feature = "no_float"))]
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Union::Float(value) => fmt::Display::fmt(value, f),
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#[cfg(not(feature = "no_index"))]
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Union::Array(value) => fmt::Debug::fmt(value, f),
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#[cfg(not(feature = "no_object"))]
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Union::Map(value) => {
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f.write_str("#")?;
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fmt::Debug::fmt(value, f)
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}
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Union::FnPtr(value) => fmt::Display::fmt(value, f),
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#[cfg(not(feature = "no_std"))]
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Union::Variant(value) if value.is::<Instant>() => f.write_str("<timestamp>"),
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Union::Variant(value) => f.write_str((*value).type_name()),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Union::Shared(cell) => {
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if let Ok(v) = cell.try_borrow() {
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fmt::Display::fmt(&*v, f)
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} else {
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f.write_str("<shared>")
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}
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}
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Union::Shared(cell) => fmt::Display::fmt(&*cell.read().unwrap(), f),
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}
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}
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}
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impl fmt::Debug for Dynamic {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.0 {
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Union::Unit(value) => fmt::Debug::fmt(value, f),
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Union::Bool(value) => fmt::Debug::fmt(value, f),
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Union::Str(value) => fmt::Debug::fmt(value, f),
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Union::Char(value) => fmt::Debug::fmt(value, f),
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Union::Int(value) => fmt::Debug::fmt(value, f),
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#[cfg(not(feature = "no_float"))]
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Union::Float(value) => fmt::Debug::fmt(value, f),
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#[cfg(not(feature = "no_index"))]
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Union::Array(value) => fmt::Debug::fmt(value, f),
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#[cfg(not(feature = "no_object"))]
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Union::Map(value) => {
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f.write_str("#")?;
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fmt::Debug::fmt(value, f)
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}
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Union::FnPtr(value) => fmt::Debug::fmt(value, f),
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#[cfg(not(feature = "no_std"))]
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Union::Variant(value) if value.is::<Instant>() => write!(f, "<timestamp>"),
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Union::Variant(value) => write!(f, "{}", (*value).type_name()),
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#[cfg(not(feature = "no_closure"))]
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#[cfg(not(feature = "sync"))]
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Union::Shared(cell) => {
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if let Ok(v) = cell.try_borrow() {
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write!(f, "{:?} (shared)", *v)
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} else {
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f.write_str("<shared>")
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}
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}
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#[cfg(not(feature = "no_closure"))]
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#[cfg(feature = "sync")]
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Union::Shared(cell) => fmt::Debug::fmt(&*cell.read().unwrap(), f),
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}
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}
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}
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impl Clone for Dynamic {
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fn clone(&self) -> Self {
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match self.0 {
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Union::Unit(value) => Self(Union::Unit(value)),
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Union::Bool(value) => Self(Union::Bool(value)),
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Union::Str(ref value) => Self(Union::Str(value.clone())),
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Union::Char(value) => Self(Union::Char(value)),
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Union::Int(value) => Self(Union::Int(value)),
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#[cfg(not(feature = "no_float"))]
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Union::Float(value) => Self(Union::Float(value)),
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#[cfg(not(feature = "no_index"))]
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Union::Array(ref value) => Self(Union::Array(value.clone())),
|
|
#[cfg(not(feature = "no_object"))]
|
|
Union::Map(ref value) => Self(Union::Map(value.clone())),
|
|
Union::FnPtr(ref value) => Self(Union::FnPtr(value.clone())),
|
|
|
|
Union::Variant(ref value) => (***value).clone_into_dynamic(),
|
|
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(ref cell) => Self(Union::Shared(cell.clone())),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Default for Dynamic {
|
|
#[inline(always)]
|
|
fn default() -> Self {
|
|
Self(Union::Unit(()))
|
|
}
|
|
}
|
|
|
|
impl Dynamic {
|
|
/// Create a `Dynamic` from any type. A `Dynamic` value is simply returned as is.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// This type uses some unsafe code, mainly for type casting.
|
|
///
|
|
/// # Notes
|
|
///
|
|
/// Beware that you need to pass in an `Array` type for it to be recognized as an `Array`.
|
|
/// A `Vec<T>` does not get automatically converted to an `Array`, but will be a generic
|
|
/// restricted trait object instead, because `Vec<T>` is not a supported standard type.
|
|
///
|
|
/// Similarly, passing in a `HashMap<String, T>` will not get a `Map` but a trait object.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use rhai::Dynamic;
|
|
///
|
|
/// let result = Dynamic::from(42_i64);
|
|
/// assert_eq!(result.type_name(), "i64");
|
|
/// assert_eq!(result.to_string(), "42");
|
|
///
|
|
/// let result = Dynamic::from("hello".to_string());
|
|
/// assert_eq!(result.type_name(), "string");
|
|
/// assert_eq!(result.to_string(), "hello");
|
|
///
|
|
/// let new_result = Dynamic::from(result);
|
|
/// assert_eq!(new_result.type_name(), "string");
|
|
/// assert_eq!(new_result.to_string(), "hello");
|
|
/// ```
|
|
#[inline(always)]
|
|
pub fn from<T: Variant + Clone>(value: T) -> Self {
|
|
let type_id = TypeId::of::<T>();
|
|
|
|
if type_id == TypeId::of::<INT>() {
|
|
return <dyn Any>::downcast_ref::<INT>(&value)
|
|
.unwrap()
|
|
.clone()
|
|
.into();
|
|
}
|
|
#[cfg(not(feature = "no_float"))]
|
|
if type_id == TypeId::of::<FLOAT>() {
|
|
return <dyn Any>::downcast_ref::<FLOAT>(&value)
|
|
.unwrap()
|
|
.clone()
|
|
.into();
|
|
}
|
|
if type_id == TypeId::of::<bool>() {
|
|
return <dyn Any>::downcast_ref::<bool>(&value)
|
|
.unwrap()
|
|
.clone()
|
|
.into();
|
|
}
|
|
if type_id == TypeId::of::<char>() {
|
|
return <dyn Any>::downcast_ref::<char>(&value)
|
|
.unwrap()
|
|
.clone()
|
|
.into();
|
|
}
|
|
if type_id == TypeId::of::<ImmutableString>() {
|
|
return <dyn Any>::downcast_ref::<ImmutableString>(&value)
|
|
.unwrap()
|
|
.clone()
|
|
.into();
|
|
}
|
|
if type_id == TypeId::of::<()>() {
|
|
return ().into();
|
|
}
|
|
|
|
let mut boxed = Box::new(value);
|
|
|
|
boxed = match unsafe_cast_box::<_, String>(boxed) {
|
|
Ok(s) => return (*s).into(),
|
|
Err(val) => val,
|
|
};
|
|
#[cfg(not(feature = "no_index"))]
|
|
{
|
|
boxed = match unsafe_cast_box::<_, Array>(boxed) {
|
|
Ok(array) => return (*array).into(),
|
|
Err(val) => val,
|
|
};
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
{
|
|
boxed = match unsafe_cast_box::<_, Map>(boxed) {
|
|
Ok(map) => return (*map).into(),
|
|
Err(val) => val,
|
|
}
|
|
}
|
|
|
|
boxed = match unsafe_cast_box::<_, FnPtr>(boxed) {
|
|
Ok(fn_ptr) => return (*fn_ptr).into(),
|
|
Err(val) => val,
|
|
};
|
|
|
|
boxed = match unsafe_cast_box::<_, Dynamic>(boxed) {
|
|
Ok(d) => return *d,
|
|
Err(val) => val,
|
|
};
|
|
|
|
Self(Union::Variant(Box::new(boxed)))
|
|
}
|
|
|
|
/// Turn the `Dynamic` value into a shared `Dynamic` value backed by an `Rc<RefCell<Dynamic>>`
|
|
/// or `Arc<RwLock<Dynamic>>` depending on the `sync` feature.
|
|
///
|
|
/// Shared `Dynamic` values are relatively cheap to clone as they simply increment the
|
|
/// reference counts.
|
|
///
|
|
/// Shared `Dynamic` values can be converted seamlessly to and from ordinary `Dynamic` values.
|
|
///
|
|
/// If the `Dynamic` value is already shared, this method returns itself.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics under the `no_closure` feature.
|
|
#[inline(always)]
|
|
pub fn into_shared(self) -> Self {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
return match self.0 {
|
|
Union::Shared(..) => self,
|
|
#[cfg(not(feature = "sync"))]
|
|
_ => Self(Union::Shared(Rc::new(RefCell::new(self)))),
|
|
#[cfg(feature = "sync")]
|
|
_ => Self(Union::Shared(Arc::new(RwLock::new(self)))),
|
|
};
|
|
|
|
#[cfg(feature = "no_closure")]
|
|
unimplemented!()
|
|
}
|
|
|
|
/// Convert the `Dynamic` value into specific type.
|
|
///
|
|
/// Casting to a `Dynamic` just returns as is, but if it contains a shared value,
|
|
/// it is cloned into a `Dynamic` with a normal value.
|
|
///
|
|
/// Returns `None` if types mismatched.
|
|
///
|
|
/// # Panics or Deadlocks
|
|
///
|
|
/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
|
|
/// Otherwise, this call panics if the data is currently borrowed for write.
|
|
///
|
|
/// These normally shouldn't occur since most operations in Rhai is single-threaded.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// use rhai::Dynamic;
|
|
///
|
|
/// let x = Dynamic::from(42_u32);
|
|
///
|
|
/// assert_eq!(x.try_cast::<u32>().unwrap(), 42);
|
|
/// ```
|
|
#[inline(always)]
|
|
pub fn try_cast<T: Variant>(self) -> Option<T> {
|
|
let type_id = TypeId::of::<T>();
|
|
|
|
match self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
#[cfg(not(feature = "sync"))]
|
|
Union::Shared(cell) => return cell.borrow().clone().try_cast(),
|
|
|
|
#[cfg(not(feature = "no_closure"))]
|
|
#[cfg(feature = "sync")]
|
|
Union::Shared(cell) => return cell.read().unwrap().clone().try_cast(),
|
|
_ => (),
|
|
}
|
|
|
|
if type_id == TypeId::of::<Dynamic>() {
|
|
return unsafe_cast_box::<_, T>(Box::new(self)).ok().map(|v| *v);
|
|
}
|
|
|
|
if type_id == TypeId::of::<INT>() {
|
|
return match self.0 {
|
|
Union::Int(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
#[cfg(not(feature = "no_float"))]
|
|
if type_id == TypeId::of::<FLOAT>() {
|
|
return match self.0 {
|
|
Union::Float(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<bool>() {
|
|
return match self.0 {
|
|
Union::Bool(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<ImmutableString>() {
|
|
return match self.0 {
|
|
Union::Str(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<String>() {
|
|
return match self.0 {
|
|
Union::Str(value) => unsafe_try_cast(value.into_owned()),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<char>() {
|
|
return match self.0 {
|
|
Union::Char(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
#[cfg(not(feature = "no_index"))]
|
|
if type_id == TypeId::of::<Array>() {
|
|
return match self.0 {
|
|
Union::Array(value) => unsafe_cast_box::<_, T>(value).ok().map(|v| *v),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
if type_id == TypeId::of::<Map>() {
|
|
return match self.0 {
|
|
Union::Map(value) => unsafe_cast_box::<_, T>(value).ok().map(|v| *v),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<FnPtr>() {
|
|
return match self.0 {
|
|
Union::FnPtr(value) => unsafe_cast_box::<_, T>(value).ok().map(|v| *v),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
if type_id == TypeId::of::<()>() {
|
|
return match self.0 {
|
|
Union::Unit(value) => unsafe_try_cast(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
|
|
match self.0 {
|
|
Union::Variant(value) => (*value).as_box_any().downcast().map(|x| *x).ok(),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => unreachable!(),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
/// Convert the `Dynamic` value into a specific type.
|
|
///
|
|
/// Casting to a `Dynamic` just returns as is, but if it contains a shared value,
|
|
/// it is cloned into a `Dynamic` with a normal value.
|
|
///
|
|
/// Returns `None` if types mismatched.
|
|
///
|
|
/// # Panics or Deadlocks
|
|
///
|
|
/// Panics if the cast fails (e.g. the type of the actual value is not the
|
|
/// same as the specified type).
|
|
///
|
|
/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
|
|
/// Otherwise, this call panics if the data is currently borrowed for write.
|
|
///
|
|
/// These normally shouldn't occur since most operations in Rhai is single-threaded.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// use rhai::Dynamic;
|
|
///
|
|
/// let x = Dynamic::from(42_u32);
|
|
///
|
|
/// assert_eq!(x.cast::<u32>(), 42);
|
|
/// ```
|
|
#[inline(always)]
|
|
pub fn cast<T: Variant + Clone>(self) -> T {
|
|
self.try_cast::<T>().unwrap()
|
|
}
|
|
|
|
/// Flatten the `Dynamic` and clone it.
|
|
///
|
|
/// If the `Dynamic` is not a shared value, it returns a cloned copy.
|
|
///
|
|
/// If the `Dynamic` is a shared value, it a cloned copy of the shared value.
|
|
#[inline(always)]
|
|
pub fn flatten_clone(&self) -> Self {
|
|
match &self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
return cell.borrow().clone();
|
|
|
|
#[cfg(feature = "sync")]
|
|
return cell.read().unwrap().clone();
|
|
}
|
|
_ => self.clone(),
|
|
}
|
|
}
|
|
|
|
/// Flatten the `Dynamic`.
|
|
///
|
|
/// If the `Dynamic` is not a shared value, it returns itself.
|
|
///
|
|
/// If the `Dynamic` is a shared value, it returns the shared value if there are
|
|
/// no outstanding references, or a cloned copy.
|
|
#[inline(always)]
|
|
pub fn flatten(self) -> Self {
|
|
match self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
return shared_try_take(cell)
|
|
.map_or_else(|c| c.borrow().clone(), RefCell::into_inner);
|
|
|
|
#[cfg(feature = "sync")]
|
|
return shared_try_take(cell)
|
|
.map_or_else(|c| c.read().unwrap().clone(), |v| v.into_inner().unwrap());
|
|
}
|
|
_ => self,
|
|
}
|
|
}
|
|
|
|
/// Is the `Dynamic` a shared value that is locked?
|
|
///
|
|
/// ## Note
|
|
///
|
|
/// Under the `sync` feature, shared values use `RwLock` and they are never locked.
|
|
/// Access just waits until the `RwLock` is released.
|
|
/// So this method always returns `false` under `sync`.
|
|
#[inline(always)]
|
|
pub fn is_locked(&self) -> bool {
|
|
match self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(ref _cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
return _cell.try_borrow().is_err();
|
|
|
|
#[cfg(feature = "sync")]
|
|
return false;
|
|
}
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
/// Get a reference of a specific type to the `Dynamic`.
|
|
/// Casting to `Dynamic` just returns a reference to it.
|
|
///
|
|
/// Returns `None` if the cast fails.
|
|
///
|
|
/// # Panics or Deadlocks When Value is Shared
|
|
///
|
|
/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
|
|
/// Otherwise, this call panics if the data is currently borrowed for write.
|
|
#[inline(always)]
|
|
pub fn read_lock<T: Variant + Clone>(&self) -> Option<DynamicReadLock<T>> {
|
|
match self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(ref cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
let data = cell.borrow();
|
|
|
|
#[cfg(feature = "sync")]
|
|
let data = cell.read().unwrap();
|
|
|
|
let type_id = (*data).type_id();
|
|
|
|
if type_id != TypeId::of::<T>() && TypeId::of::<Dynamic>() != TypeId::of::<T>() {
|
|
None
|
|
} else {
|
|
Some(DynamicReadLock(DynamicReadLockInner::Guard(data)))
|
|
}
|
|
}
|
|
_ => self
|
|
.downcast_ref()
|
|
.map(|r| DynamicReadLock(DynamicReadLockInner::Reference(r))),
|
|
}
|
|
}
|
|
|
|
/// Get a mutable reference of a specific type to the `Dynamic`.
|
|
/// Casting to `Dynamic` just returns a mutable reference to it.
|
|
///
|
|
/// Returns `None` if the cast fails.
|
|
///
|
|
/// # Panics or Deadlocks When Value is Shared
|
|
///
|
|
/// Under the `sync` feature, this call may deadlock, or [panic](https://doc.rust-lang.org/std/sync/struct.RwLock.html#panics-1).
|
|
/// Otherwise, this call panics if the data is currently borrowed for write.
|
|
#[inline(always)]
|
|
pub fn write_lock<T: Variant + Clone>(&mut self) -> Option<DynamicWriteLock<T>> {
|
|
match self.0 {
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(ref cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
let data = cell.borrow_mut();
|
|
|
|
#[cfg(feature = "sync")]
|
|
let data = cell.write().unwrap();
|
|
|
|
let type_id = (*data).type_id();
|
|
|
|
if type_id != TypeId::of::<T>() && TypeId::of::<Dynamic>() != TypeId::of::<T>() {
|
|
None
|
|
} else {
|
|
Some(DynamicWriteLock(DynamicWriteLockInner::Guard(data)))
|
|
}
|
|
}
|
|
_ => self
|
|
.downcast_mut()
|
|
.map(|r| DynamicWriteLock(DynamicWriteLockInner::Reference(r))),
|
|
}
|
|
}
|
|
|
|
/// Get a reference of a specific type to the `Dynamic`.
|
|
/// Casting to `Dynamic` just returns a reference to it.
|
|
///
|
|
/// Returns `None` if the cast fails, or if the value is shared.
|
|
#[inline(always)]
|
|
pub(crate) fn downcast_ref<T: Variant + Clone>(&self) -> Option<&T> {
|
|
let type_id = TypeId::of::<T>();
|
|
|
|
if type_id == TypeId::of::<INT>() {
|
|
return match &self.0 {
|
|
Union::Int(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_float"))]
|
|
if type_id == TypeId::of::<FLOAT>() {
|
|
return match &self.0 {
|
|
Union::Float(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<bool>() {
|
|
return match &self.0 {
|
|
Union::Bool(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<ImmutableString>() {
|
|
return match &self.0 {
|
|
Union::Str(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<String>() {
|
|
return match &self.0 {
|
|
Union::Str(value) => <dyn Any>::downcast_ref::<T>(value.as_ref()),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<char>() {
|
|
return match &self.0 {
|
|
Union::Char(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_index"))]
|
|
if type_id == TypeId::of::<Array>() {
|
|
return match &self.0 {
|
|
Union::Array(value) => <dyn Any>::downcast_ref::<T>(value.as_ref()),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_object"))]
|
|
if type_id == TypeId::of::<Map>() {
|
|
return match &self.0 {
|
|
Union::Map(value) => <dyn Any>::downcast_ref::<T>(value.as_ref()),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<FnPtr>() {
|
|
return match &self.0 {
|
|
Union::FnPtr(value) => <dyn Any>::downcast_ref::<T>(value.as_ref()),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<()>() {
|
|
return match &self.0 {
|
|
Union::Unit(value) => <dyn Any>::downcast_ref::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<Dynamic>() {
|
|
return <dyn Any>::downcast_ref::<T>(self);
|
|
}
|
|
|
|
match &self.0 {
|
|
Union::Variant(value) => value.as_ref().as_ref().as_any().downcast_ref::<T>(),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => None,
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
/// Get a mutable reference of a specific type to the `Dynamic`.
|
|
/// Casting to `Dynamic` just returns a mutable reference to it.
|
|
///
|
|
/// Returns `None` if the cast fails, or if the value is shared.
|
|
#[inline(always)]
|
|
pub(crate) fn downcast_mut<T: Variant + Clone>(&mut self) -> Option<&mut T> {
|
|
let type_id = TypeId::of::<T>();
|
|
|
|
if type_id == TypeId::of::<INT>() {
|
|
return match &mut self.0 {
|
|
Union::Int(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_float"))]
|
|
if type_id == TypeId::of::<FLOAT>() {
|
|
return match &mut self.0 {
|
|
Union::Float(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<bool>() {
|
|
return match &mut self.0 {
|
|
Union::Bool(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<ImmutableString>() {
|
|
return match &mut self.0 {
|
|
Union::Str(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<char>() {
|
|
return match &mut self.0 {
|
|
Union::Char(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_index"))]
|
|
if type_id == TypeId::of::<Array>() {
|
|
return match &mut self.0 {
|
|
Union::Array(value) => <dyn Any>::downcast_mut::<T>(value.as_mut()),
|
|
_ => None,
|
|
};
|
|
}
|
|
#[cfg(not(feature = "no_object"))]
|
|
if type_id == TypeId::of::<Map>() {
|
|
return match &mut self.0 {
|
|
Union::Map(value) => <dyn Any>::downcast_mut::<T>(value.as_mut()),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<FnPtr>() {
|
|
return match &mut self.0 {
|
|
Union::FnPtr(value) => <dyn Any>::downcast_mut::<T>(value.as_mut()),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<()>() {
|
|
return match &mut self.0 {
|
|
Union::Unit(value) => <dyn Any>::downcast_mut::<T>(value),
|
|
_ => None,
|
|
};
|
|
}
|
|
if type_id == TypeId::of::<Dynamic>() {
|
|
return <dyn Any>::downcast_mut::<T>(self);
|
|
}
|
|
|
|
match &mut self.0 {
|
|
Union::Variant(value) => value.as_mut().as_mut_any().downcast_mut::<T>(),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => None,
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
/// Cast the `Dynamic` as the system integer type `INT` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
#[inline(always)]
|
|
pub fn as_int(&self) -> Result<INT, &'static str> {
|
|
match self.0 {
|
|
Union::Int(n) => Ok(n),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => self.read_lock().map(|v| *v).ok_or_else(|| self.type_name()),
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
|
|
/// Cast the `Dynamic` as the system floating-point type `FLOAT` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
#[cfg(not(feature = "no_float"))]
|
|
#[inline(always)]
|
|
pub fn as_float(&self) -> Result<FLOAT, &'static str> {
|
|
match self.0 {
|
|
Union::Float(n) => Ok(n),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => self.read_lock().map(|v| *v).ok_or_else(|| self.type_name()),
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
|
|
/// Cast the `Dynamic` as a `bool` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
#[inline(always)]
|
|
pub fn as_bool(&self) -> Result<bool, &'static str> {
|
|
match self.0 {
|
|
Union::Bool(b) => Ok(b),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => self.read_lock().map(|v| *v).ok_or_else(|| self.type_name()),
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
|
|
/// Cast the `Dynamic` as a `char` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
#[inline(always)]
|
|
pub fn as_char(&self) -> Result<char, &'static str> {
|
|
match self.0 {
|
|
Union::Char(n) => Ok(n),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(_) => self.read_lock().map(|v| *v).ok_or_else(|| self.type_name()),
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
|
|
/// Cast the `Dynamic` as a string and return the string slice.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
///
|
|
/// Cast is failing if `self` is Shared Dynamic
|
|
#[inline(always)]
|
|
pub fn as_str(&self) -> Result<&str, &'static str> {
|
|
match &self.0 {
|
|
Union::Str(s) => Ok(s),
|
|
Union::FnPtr(f) => Ok(f.fn_name()),
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
|
|
/// Convert the `Dynamic` into `String` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
#[inline(always)]
|
|
pub fn take_string(self) -> Result<String, &'static str> {
|
|
self.take_immutable_string()
|
|
.map(ImmutableString::into_owned)
|
|
}
|
|
|
|
/// Convert the `Dynamic` into `ImmutableString` and return it.
|
|
/// Returns the name of the actual type if the cast fails.
|
|
pub(crate) fn take_immutable_string(self) -> Result<ImmutableString, &'static str> {
|
|
match self.0 {
|
|
Union::Str(s) => Ok(s),
|
|
Union::FnPtr(f) => Ok(f.take_data().0),
|
|
#[cfg(not(feature = "no_closure"))]
|
|
Union::Shared(cell) => {
|
|
#[cfg(not(feature = "sync"))]
|
|
{
|
|
let inner = cell.borrow();
|
|
match &inner.0 {
|
|
Union::Str(s) => Ok(s.clone()),
|
|
Union::FnPtr(f) => Ok(f.clone().take_data().0),
|
|
_ => Err((*inner).type_name()),
|
|
}
|
|
}
|
|
#[cfg(feature = "sync")]
|
|
{
|
|
let inner = cell.read().unwrap();
|
|
match &inner.0 {
|
|
Union::Str(s) => Ok(s.clone()),
|
|
Union::FnPtr(f) => Ok(f.clone().take_data().0),
|
|
_ => Err((*inner).type_name()),
|
|
}
|
|
}
|
|
}
|
|
_ => Err(self.type_name()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<()> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: ()) -> Self {
|
|
Self(Union::Unit(value))
|
|
}
|
|
}
|
|
impl From<bool> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: bool) -> Self {
|
|
Self(Union::Bool(value))
|
|
}
|
|
}
|
|
impl From<INT> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: INT) -> Self {
|
|
Self(Union::Int(value))
|
|
}
|
|
}
|
|
#[cfg(not(feature = "no_float"))]
|
|
impl From<FLOAT> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: FLOAT) -> Self {
|
|
Self(Union::Float(value))
|
|
}
|
|
}
|
|
impl From<char> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: char) -> Self {
|
|
Self(Union::Char(value))
|
|
}
|
|
}
|
|
impl<S: Into<ImmutableString>> From<S> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: S) -> Self {
|
|
Self(Union::Str(value.into()))
|
|
}
|
|
}
|
|
#[cfg(not(feature = "no_index"))]
|
|
impl<T: Variant + Clone> From<Vec<T>> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: Vec<T>) -> Self {
|
|
Self(Union::Array(Box::new(
|
|
value.into_iter().map(Dynamic::from).collect(),
|
|
)))
|
|
}
|
|
}
|
|
#[cfg(not(feature = "no_index"))]
|
|
impl<T: Variant + Clone> From<&[T]> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: &[T]) -> Self {
|
|
Self(Union::Array(Box::new(
|
|
value.iter().cloned().map(Dynamic::from).collect(),
|
|
)))
|
|
}
|
|
}
|
|
#[cfg(not(feature = "no_object"))]
|
|
impl<K: Into<ImmutableString>, T: Variant + Clone> From<HashMap<K, T>> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: HashMap<K, T>) -> Self {
|
|
Self(Union::Map(Box::new(
|
|
value
|
|
.into_iter()
|
|
.map(|(k, v)| (k.into(), Dynamic::from(v)))
|
|
.collect(),
|
|
)))
|
|
}
|
|
}
|
|
impl From<FnPtr> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: FnPtr) -> Self {
|
|
Self(Union::FnPtr(Box::new(value)))
|
|
}
|
|
}
|
|
impl From<Box<FnPtr>> for Dynamic {
|
|
#[inline(always)]
|
|
fn from(value: Box<FnPtr>) -> Self {
|
|
Self(Union::FnPtr(value))
|
|
}
|
|
}
|