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Change Dynamic to enum.

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This commit is contained in:
Stephen Chung 2020-04-12 23:00:06 +08:00
parent 50a0f14bfc
commit 5152a40e93
13 changed files with 727 additions and 482 deletions
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23
README.md
View File

@ -439,12 +439,10 @@ There is no easy way for Rust to decide, at run-time, what type the `Dynamic` va
function and match against the name).
A `Dynamic` value's actual type can be checked via the `is` method.
The `cast` method (from the `rhai::AnyExt` trait) then converts the value into a specific, known type.
The `cast` method then converts the value into a specific, known type.
Alternatively, use the `try_cast` method which does not panic but returns an error when the cast fails.
```rust
use rhai::AnyExt; // pull in the trait.
let list: Array = engine.eval("...")?; // return type is 'Array'
let item = list[0]; // an element in an 'Array' is 'Dynamic'
@ -459,8 +457,6 @@ let value = item.try_cast::<i64>()?; // 'try_cast' does not panic whe
The `type_name` method gets the name of the actual type as a static string slice, which you may match against.
```rust
use rhai::Any; // pull in the trait.
let list: Array = engine.eval("...")?; // return type is 'Array'
let item = list[0]; // an element in an 'Array' is 'Dynamic'
@ -499,8 +495,6 @@ A number of traits, under the `rhai::` module namespace, provide additional func
| Trait | Description | Methods |
| ------------------- | --------------------------------------------------------------------------------- | --------------------------------------- |
| `Any` | Generic trait that represents a [`Dynamic`] type | `type_id`, `type_name`, `into_dynamic` |
| `AnyExt` | Extension trait to allows casting of a [`Dynamic`] value to Rust types | `cast`, `try_cast` |
| `RegisterFn` | Trait for registering functions | `register_fn` |
| `RegisterDynamicFn` | Trait for registering functions returning [`Dynamic`] | `register_dynamic_fn` |
| `RegisterResultFn` | Trait for registering fallible functions returning `Result<`_T_`, EvalAltResult>` | `register_result_fn` |
@ -513,9 +507,9 @@ Rhai's scripting engine is very lightweight. It gets most of its abilities from
To call these functions, they need to be registered with the [`Engine`].
```rust
use rhai::{Engine, EvalAltResult};
use rhai::{Dynamic, Engine, EvalAltResult};
use rhai::RegisterFn; // use 'RegisterFn' trait for 'register_fn'
use rhai::{Any, Dynamic, RegisterDynamicFn}; // use 'RegisterDynamicFn' trait for 'register_dynamic_fn'
use rhai::{Dynamic, RegisterDynamicFn}; // use 'RegisterDynamicFn' trait for 'register_dynamic_fn'
// Normal function
fn add(x: i64, y: i64) -> i64 {
@ -524,7 +518,7 @@ fn add(x: i64, y: i64) -> i64 {
// Function that returns a Dynamic value
fn get_an_any() -> Dynamic {
(42_i64).into_dynamic() // 'into_dynamic' is defined by the 'rhai::Any' trait
Dynamic::from(42_i64)
}
fn main() -> Result<(), EvalAltResult>
@ -548,17 +542,16 @@ fn main() -> Result<(), EvalAltResult>
}
```
To return a [`Dynamic`] value from a Rust function, use the `into_dynamic()` method
(under the `rhai::Any` trait) to convert it.
To return a [`Dynamic`] value from a Rust function, use the `Dynamic::from` method.
```rust
use rhai::Any; // pull in the trait
use rhai::Dynamic;
fn decide(yes_no: bool) -> Dynamic {
if yes_no {
(42_i64).into_dynamic()
Dynamic::from(42_i64)
} else {
String::from("hello!").into_dynamic() // remember &str is not supported by Rhai
Dynamic::from(String::from("hello!")) // remember &str is not supported by Rhai
}
}
```

514
src/any.rs
View File

@ -1,70 +1,38 @@
//! Helper module which defines the `Any` trait to to allow dynamic value handling.
use crate::engine::{Array, Map};
use crate::parser::INT;
#[cfg(not(feature = "no_float"))]
use crate::parser::FLOAT;
use crate::stdlib::{
any::{type_name, TypeId},
any::{type_name, Any, TypeId},
boxed::Box,
fmt,
time::Instant,
};
/// An raw value of any type.
/// A trait to represent any type.
///
/// Currently, `Variant` is not `Send` nor `Sync`, so it can practically be any type.
/// Turn on the `sync` feature to restrict it to only types that implement `Send + Sync`.
pub type Variant = dyn Any;
/// A boxed dynamic type containing any value.
///
/// Currently, `Dynamic` is not `Send` nor `Sync`, so it can practically be any type.
/// Turn on the `sync` feature to restrict it to only types that implement `Send + Sync`.
pub type Dynamic = Box<Variant>;
/// A trait covering any type.
#[cfg(feature = "sync")]
pub trait Any: crate::stdlib::any::Any + Send + Sync {
/// Get the `TypeId` of this type.
fn type_id(&self) -> TypeId;
/// Get the name of this type.
fn type_name(&self) -> &'static str;
/// Convert into `Dynamic`.
fn into_dynamic(&self) -> Dynamic;
/// This trait may only be implemented by `rhai`.
#[doc(hidden)]
fn _closed(&self) -> _Private;
}
#[cfg(feature = "sync")]
impl<T: crate::stdlib::any::Any + Clone + Send + Sync + ?Sized> Any for T {
fn type_id(&self) -> TypeId {
TypeId::of::<T>()
}
fn type_name(&self) -> &'static str {
type_name::<T>()
}
fn into_dynamic(&self) -> Dynamic {
Box::new(self.clone())
}
fn _closed(&self) -> _Private {
_Private
}
}
/// A trait covering any type.
#[cfg(not(feature = "sync"))]
pub trait Any: crate::stdlib::any::Any {
/// Get the `TypeId` of this type.
fn type_id(&self) -> TypeId;
pub trait Variant: Any {
/// Convert this `Variant` trait object to `&dyn Any`.
fn as_any(&self) -> &dyn Any;
/// Convert this `Variant` trait object to `&mut dyn Any`.
fn as_mut_any(&mut self) -> &mut dyn Any;
/// Get the name of this type.
fn type_name(&self) -> &'static str;
/// Convert into `Dynamic`.
fn into_dynamic(&self) -> Dynamic;
fn into_dynamic(self) -> Dynamic;
/// Clone into `Dynamic`.
fn clone_into_dynamic(&self) -> Dynamic;
/// This trait may only be implemented by `rhai`.
#[doc(hidden)]
@ -72,103 +40,314 @@ pub trait Any: crate::stdlib::any::Any {
}
#[cfg(not(feature = "sync"))]
impl<T: crate::stdlib::any::Any + Clone + ?Sized> Any for T {
fn type_id(&self) -> TypeId {
TypeId::of::<T>()
impl<T: Any + Clone> Variant for T {
fn as_any(&self) -> &dyn Any {
self as &dyn Any
}
fn as_mut_any(&mut self) -> &mut dyn Any {
self as &mut dyn Any
}
fn type_name(&self) -> &'static str {
type_name::<T>()
}
fn into_dynamic(&self) -> Dynamic {
Box::new(self.clone())
fn into_dynamic(self) -> Dynamic {
Dynamic::from(self)
}
fn clone_into_dynamic(&self) -> Dynamic {
Dynamic::from(self.clone())
}
fn _closed(&self) -> _Private {
_Private
}
}
impl Variant {
/// A trait to represent any type.
#[cfg(feature = "sync")]
pub trait Variant: Any + Send + Sync {
/// Convert this `Variant` trait object to `&dyn Any`.
fn as_any(&self) -> &dyn Any;
/// Convert this `Variant` trait object to `&mut dyn Any`.
fn as_mut_any(&mut self) -> &mut dyn Any;
/// Get the name of this type.
fn type_name(&self) -> &'static str;
/// Convert into `Dynamic`.
fn into_dynamic(self) -> Dynamic;
/// Clone into `Dynamic`.
fn clone_into_dynamic(&self) -> Dynamic;
/// This trait may only be implemented by `rhai`.
#[doc(hidden)]
fn _closed(&self) -> _Private;
}
#[cfg(feature = "sync")]
impl<T: Any + Clone + Send + Sync> Variant for T {
fn as_any(&self) -> &dyn Any {
self as &dyn Any
}
fn as_mut_any(&mut self) -> &mut dyn Any {
self as &mut dyn Any
}
fn type_name(&self) -> &'static str {
type_name::<T>()
}
fn into_dynamic(self) -> Dynamic {
Dynamic::from(self)
}
fn clone_into_dynamic(&self) -> Dynamic {
Dynamic::from(self.clone())
}
fn _closed(&self) -> _Private {
_Private
}
}
impl dyn Variant {
/// Is this `Variant` a specific type?
pub fn is<T: Any>(&self) -> bool {
TypeId::of::<T>() == <Variant as Any>::type_id(self)
TypeId::of::<T>() == self.type_id()
}
/// Get a reference of a specific type to the `Variant`.
/// Returns `None` if the cast fails.
pub fn downcast_ref<T: Any>(&self) -> Option<&T> {
if self.is::<T>() {
unsafe { Some(&*(self as *const Variant as *const T)) }
} else {
None
}
Any::downcast_ref::<T>(self.as_any())
}
/// Get a mutable reference of a specific type to the `Variant`.
/// Returns `None` if the cast fails.
pub fn downcast_mut<T: Any>(&mut self) -> Option<&mut T> {
if self.is::<T>() {
unsafe { Some(&mut *(self as *mut Variant as *mut T)) }
} else {
None
Any::downcast_mut::<T>(self.as_mut_any())
}
}
/// A dynamic type containing any value.
pub struct Dynamic(pub(crate) Union);
/// Internal `Dynamic` representation.
pub enum Union {
Unit(()),
Bool(bool),
Str(String),
Char(char),
Int(INT),
#[cfg(not(feature = "no_float"))]
Float(FLOAT),
Array(Array),
Map(Box<Map>), // Box it to reduce size
Variant(Box<dyn Variant>),
}
impl Dynamic {
/// Is the value held by this `Dynamic` a particular type?
pub fn is<T: Variant + Clone>(&self) -> bool {
self.type_id() == TypeId::of::<T>()
}
/// Get the TypeId of the value held by this `Dynamic`.
pub fn type_id(&self) -> TypeId {
match &self.0 {
Union::Unit(_) => TypeId::of::<()>(),
Union::Bool(_) => TypeId::of::<bool>(),
Union::Str(_) => TypeId::of::<String>(),
Union::Char(_) => TypeId::of::<char>(),
Union::Int(_) => TypeId::of::<INT>(),
#[cfg(not(feature = "no_float"))]
Union::Float(_) => TypeId::of::<FLOAT>(),
Union::Array(_) => TypeId::of::<Array>(),
Union::Map(_) => TypeId::of::<Map>(),
Union::Variant(value) => (**value).type_id(),
}
}
/// Get the name of the type of the value held by this `Dynamic`.
pub fn type_name(&self) -> &'static str {
match &self.0 {
Union::Unit(_) => "()",
Union::Bool(_) => "bool",
Union::Str(_) => "string",
Union::Char(_) => "char",
Union::Int(_) => type_name::<INT>(),
#[cfg(not(feature = "no_float"))]
Union::Float(_) => type_name::<FLOAT>(),
Union::Array(_) => "array",
Union::Map(_) => "map",
Union::Variant(value) if value.is::<Instant>() => "timestamp",
Union::Variant(value) => (**value).type_name(),
}
}
}
impl fmt::Debug for Variant {
impl fmt::Display for Dynamic {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad("?")
match &self.0 {
Union::Unit(_) => write!(f, ""),
Union::Bool(value) => write!(f, "{}", value),
Union::Str(value) => write!(f, "{}", value),
Union::Char(value) => write!(f, "{}", value),
Union::Int(value) => write!(f, "{}", value),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => write!(f, "{}", value),
Union::Array(value) => write!(f, "{:?}", value),
Union::Map(value) => write!(f, "{:?}", value),
Union::Variant(_) => write!(f, "?"),
}
}
}
impl fmt::Debug for Dynamic {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match &self.0 {
Union::Unit(value) => write!(f, "{:?}", value),
Union::Bool(value) => write!(f, "{:?}", value),
Union::Str(value) => write!(f, "{:?}", value),
Union::Char(value) => write!(f, "{:?}", value),
Union::Int(value) => write!(f, "{:?}", value),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => write!(f, "{:?}", value),
Union::Array(value) => write!(f, "{:?}", value),
Union::Map(value) => write!(f, "{:?}", value),
Union::Variant(_) => write!(f, "?"),
}
}
}
impl Clone for Dynamic {
fn clone(&self) -> Self {
self.as_ref().into_dynamic()
match &self.0 {
Union::Unit(value) => Self(Union::Unit(value.clone())),
Union::Bool(value) => Self(Union::Bool(value.clone())),
Union::Str(value) => Self(Union::Str(value.clone())),
Union::Char(value) => Self(Union::Char(value.clone())),
Union::Int(value) => Self(Union::Int(value.clone())),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => Self(Union::Float(value.clone())),
Union::Array(value) => Self(Union::Array(value.clone())),
Union::Map(value) => Self(Union::Map(value.clone())),
Union::Variant(value) => (**value).clone_into_dynamic(),
}
}
}
/// An extension trait that allows down-casting a `Dynamic` value to a specific type.
pub trait AnyExt: Sized {
/// Get a copy of a `Dynamic` value as a specific type.
fn try_cast<T: Any + Clone>(self) -> Result<T, Self>;
/// Get a copy of a `Dynamic` value as a specific type.
impl Dynamic {
/// Create a `Dynamic` from any type.
///
/// # Panics
///
/// Panics if the cast fails (e.g. the type of the actual value is not the same as the specified type).
fn cast<T: Any + Clone>(self) -> T;
/// This trait may only be implemented by `rhai`.
#[doc(hidden)]
fn _closed(&self) -> _Private;
}
impl AnyExt for Dynamic {
/// Get a copy of the `Dynamic` value as a specific type.
///
/// # Example
/// # Examples
///
/// ```
/// use rhai::{Dynamic, Any, AnyExt};
/// use rhai::Dynamic;
///
/// let x: Dynamic = 42_u32.into_dynamic();
/// let result = Dynamic::from(42_i64);
/// assert_eq!(result.type_name(), "i64");
/// assert_eq!(result.to_string(), "42");
///
/// assert_eq!(x.try_cast::<u32>().unwrap(), 42);
/// let result = Dynamic::from("hello".to_string());
/// assert_eq!(result.type_name(), "string");
/// assert_eq!(result.to_string(), "hello");
/// ```
fn try_cast<T: Any + Clone>(self) -> Result<T, Self> {
if self.is::<T>() {
pub fn from<T: Variant + Clone>(value: T) -> Self {
if let Some(result) = (&value as &dyn Variant)
.downcast_ref::<()>()
.cloned()
.map(Union::Unit)
.or_else(|| {
(&value as &dyn Variant)
.downcast_ref::<bool>()
.cloned()
.map(Union::Bool)
.or_else(|| {
(&value as &dyn Variant)
.downcast_ref::<INT>()
.cloned()
.map(Union::Int)
.or_else(|| {
(&value as &dyn Variant)
.downcast_ref::<char>()
.cloned()
.map(Union::Char)
})
})
})
{
return Self(result);
}
#[cfg(not(feature = "no_float"))]
{
if let Some(result) = (&value as &dyn Variant)
.downcast_ref::<char>()
.cloned()
.map(Union::Char)
{
return Self(result);
}
}
fn cast_box<X: Variant, T: Variant>(item: Box<X>) -> Result<T, Box<X>> {
if TypeId::of::<X>() == TypeId::of::<T>() {
unsafe {
let raw: *mut Variant = Box::into_raw(self);
let raw: *mut dyn Any = Box::into_raw(item as Box<dyn Any>);
Ok(*Box::from_raw(raw as *mut T))
}
} else {
Err(self)
Err(item)
}
}
let var = Box::new(value);
Self(
cast_box::<_, String>(var)
.map(Union::Str)
.or_else(|var| {
cast_box::<_, Array>(var).map(Union::Array).or_else(|var| {
cast_box::<_, Map>(var)
.map(|v| Union::Map(Box::new(v)))
.or_else(|var| -> Result<Union, ()> {
Ok(Union::Variant(var as Box<dyn Variant>))
})
})
})
.unwrap(),
)
}
/// Get a copy of the `Dynamic` value as a specific type.
///
/// Returns an error with the name of the value's actual type when the cast fails.
///
/// # Example
///
/// ```
/// use rhai::Dynamic;
///
/// let x = Dynamic::from(42_u32);
///
/// assert_eq!(x.try_cast::<u32>().unwrap(), 42);
/// ```
pub fn try_cast<T: Variant + Clone>(self) -> Result<T, Self> {
match &self.0 {
Union::Unit(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Bool(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Str(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Char(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Int(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Array(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Map(value) => (value.as_ref() as &dyn Variant)
.downcast_ref::<T>()
.cloned(),
Union::Variant(value) => value.as_ref().downcast_ref::<T>().cloned(),
}
.ok_or(self)
}
/// Get a copy of the `Dynamic` value as a specific type.
///
/// # Panics
@ -178,18 +357,141 @@ impl AnyExt for Dynamic {
/// # Example
///
/// ```
/// use rhai::{Dynamic, Any, AnyExt};
/// use rhai::Dynamic;
///
/// let x: Dynamic = 42_u32.into_dynamic();
/// let x = Dynamic::from(42_u32);
///
/// assert_eq!(x.cast::<u32>(), 42);
/// ```
fn cast<T: Any + Clone>(self) -> T {
self.try_cast::<T>().expect("cast failed")
pub fn cast<T: Variant + Clone>(self) -> T {
self.try_cast::<T>().unwrap()
}
fn _closed(&self) -> _Private {
_Private
/// Get a reference of a specific type to the `Dynamic`.
/// Returns `None` if the cast fails.
pub fn downcast_ref<T: Variant + Clone>(&self) -> Option<&T> {
match &self.0 {
Union::Unit(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Bool(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Str(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Char(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Int(value) => (value as &dyn Variant).downcast_ref::<T>(),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Array(value) => (value as &dyn Variant).downcast_ref::<T>(),
Union::Map(value) => (value.as_ref() as &dyn Variant).downcast_ref::<T>(),
Union::Variant(value) => value.as_ref().downcast_ref::<T>(),
}
}
/// Get a mutable reference of a specific type to the `Dynamic`.
/// Returns `None` if the cast fails.
pub fn downcast_mut<T: Variant + Clone>(&mut self) -> Option<&mut T> {
match &mut self.0 {
Union::Unit(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Bool(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Str(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Char(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Int(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Array(value) => (value as &mut dyn Variant).downcast_mut::<T>(),
Union::Map(value) => (value.as_mut() as &mut dyn Variant).downcast_mut::<T>(),
Union::Variant(value) => value.as_mut().downcast_mut::<T>(),
}
}
/// Cast the `Dynamic` as the system integer type `INT` and return it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn as_int(&self) -> Result<INT, &'static str> {
match self.0 {
Union::Int(n) => Ok(n),
_ => Err(self.type_name()),
}
}
/// Cast the `Dynamic` as the system integer type `INT` and return it.
/// Returns the name of the actual type if the cast fails.
#[cfg(not(feature = "no_float"))]
pub(crate) fn as_float(&self) -> Result<FLOAT, &'static str> {
match self.0 {
Union::Float(n) => Ok(n),
_ => Err(self.type_name()),
}
}
/// Cast the `Dynamic` as a `bool` and return it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn as_bool(&self) -> Result<bool, &'static str> {
match self.0 {
Union::Bool(b) => Ok(b),
_ => Err(self.type_name()),
}
}
/// Cast the `Dynamic` as a `char` and return it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn as_char(&self) -> Result<char, &'static str> {
match self.0 {
Union::Char(n) => Ok(n),
_ => 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.
pub(crate) fn as_str(&self) -> Result<&str, &'static str> {
match &self.0 {
Union::Str(s) => Ok(s),
_ => Err(self.type_name()),
}
}
/// Convert the `Dynamic` into `String` and return it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn take_string(self) -> Result<String, &'static str> {
match self.0 {
Union::Str(s) => Ok(s),
_ => Err(self.type_name()),
}
}
/// Cast the `Dynamic` as an `Array` and return a reference to it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn as_array(&self) -> Result<&Array, &'static str> {
match &self.0 {
Union::Array(array) => Ok(array),
_ => Err(self.type_name()),
}
}
/// Cast the `Dynamic` as a `Map` and return a reference to it.
/// Returns the name of the actual type if the cast fails.
pub(crate) fn as_map(&self) -> Result<&Map, &'static str> {
match &self.0 {
Union::Map(map) => Ok(map),
_ => Err(self.type_name()),
}
}
pub(crate) fn from_unit() -> Self {
Self(Union::Unit(()))
}
pub(crate) fn from_bool(value: bool) -> Self {
Self(Union::Bool(value))
}
pub(crate) fn from_int(value: INT) -> Self {
Self(Union::Int(value))
}
#[cfg(not(feature = "no_float"))]
pub(crate) fn from_float(value: FLOAT) -> Self {
Self(Union::Float(value))
}
pub(crate) fn from_char(value: char) -> Self {
Self(Union::Char(value))
}
pub(crate) fn from_string(value: String) -> Self {
Self(Union::Str(value))
}
}

50
src/api.rs
View File

@ -1,6 +1,6 @@
//! Module that defines the extern API of `Engine`.
use crate::any::{Any, AnyExt, Dynamic};
use crate::any::{Dynamic, Variant};
use crate::engine::{make_getter, make_setter, Engine, FnAny, FnSpec, Map};
use crate::error::ParseError;
use crate::fn_call::FuncArgs;
@ -109,7 +109,7 @@ impl<'e> Engine<'e> {
/// # }
/// ```
#[cfg(not(feature = "no_object"))]
pub fn register_type<T: Any + Clone>(&mut self) {
pub fn register_type<T: Variant + Clone>(&mut self) {
self.register_type_with_name::<T>(type_name::<T>());
}
@ -157,7 +157,7 @@ impl<'e> Engine<'e> {
/// # }
/// ```
#[cfg(not(feature = "no_object"))]
pub fn register_type_with_name<T: Any + Clone>(&mut self, name: &str) {
pub fn register_type_with_name<T: Variant + Clone>(&mut self, name: &str) {
if self.type_names.is_none() {
self.type_names = Some(HashMap::new());
}
@ -171,7 +171,7 @@ impl<'e> Engine<'e> {
/// Register an iterator adapter for a type with the `Engine`.
/// This is an advanced feature.
pub fn register_iterator<T: Any, F: IteratorCallback>(&mut self, f: F) {
pub fn register_iterator<T: Variant + Clone, F: IteratorCallback>(&mut self, f: F) {
if self.type_iterators.is_none() {
self.type_iterators = Some(HashMap::new());
}
@ -221,8 +221,8 @@ impl<'e> Engine<'e> {
#[cfg(not(feature = "no_object"))]
pub fn register_get<T, U, F>(&mut self, name: &str, callback: F)
where
T: Any + Clone,
U: Any + Clone,
T: Variant + Clone,
U: Variant + Clone,
F: ObjectGetCallback<T, U>,
{
self.register_fn(&make_getter(name), callback);
@ -267,8 +267,8 @@ impl<'e> Engine<'e> {
#[cfg(not(feature = "no_object"))]
pub fn register_set<T, U, F>(&mut self, name: &str, callback: F)
where
T: Any + Clone,
U: Any + Clone,
T: Variant + Clone,
U: Variant + Clone,
F: ObjectSetCallback<T, U>,
{
self.register_fn(&make_setter(name), callback);
@ -315,8 +315,8 @@ impl<'e> Engine<'e> {
#[cfg(not(feature = "no_object"))]
pub fn register_get_set<T, U, G, S>(&mut self, name: &str, get_fn: G, set_fn: S)
where
T: Any + Clone,
U: Any + Clone,
T: Variant + Clone,
U: Variant + Clone,
G: ObjectGetCallback<T, U>,
S: ObjectSetCallback<T, U>,
{
@ -487,7 +487,7 @@ impl<'e> Engine<'e> {
///
/// ```
/// # fn main() -> Result<(), rhai::EvalAltResult> {
/// use rhai::{Engine, AnyExt};
/// use rhai::Engine;
///
/// let engine = Engine::new();
///
@ -612,7 +612,7 @@ impl<'e> Engine<'e> {
/// # }
/// ```
#[cfg(not(feature = "no_std"))]
pub fn eval_file<T: Any + Clone>(&self, path: PathBuf) -> Result<T, EvalAltResult> {
pub fn eval_file<T: Variant + Clone>(&self, path: PathBuf) -> Result<T, EvalAltResult> {
Self::read_file(path).and_then(|contents| self.eval::<T>(&contents))
}
@ -636,7 +636,7 @@ impl<'e> Engine<'e> {
/// # }
/// ```
#[cfg(not(feature = "no_std"))]
pub fn eval_file_with_scope<T: Any + Clone>(
pub fn eval_file_with_scope<T: Variant + Clone>(
&self,
scope: &mut Scope,
path: PathBuf,
@ -658,7 +658,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval<T: Any + Clone>(&self, script: &str) -> Result<T, EvalAltResult> {
pub fn eval<T: Variant + Clone>(&self, script: &str) -> Result<T, EvalAltResult> {
self.eval_with_scope(&mut Scope::new(), script)
}
@ -684,7 +684,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval_with_scope<T: Any + Clone>(
pub fn eval_with_scope<T: Variant + Clone>(
&self,
scope: &mut Scope,
script: &str,
@ -709,7 +709,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval_expression<T: Any + Clone>(&self, script: &str) -> Result<T, EvalAltResult> {
pub fn eval_expression<T: Variant + Clone>(&self, script: &str) -> Result<T, EvalAltResult> {
self.eval_expression_with_scope(&mut Scope::new(), script)
}
@ -731,7 +731,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval_expression_with_scope<T: Any + Clone>(
pub fn eval_expression_with_scope<T: Variant + Clone>(
&self,
scope: &mut Scope,
script: &str,
@ -761,7 +761,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval_ast<T: Any + Clone>(&self, ast: &AST) -> Result<T, EvalAltResult> {
pub fn eval_ast<T: Variant + Clone>(&self, ast: &AST) -> Result<T, EvalAltResult> {
self.eval_ast_with_scope(&mut Scope::new(), ast)
}
@ -794,7 +794,7 @@ impl<'e> Engine<'e> {
/// # Ok(())
/// # }
/// ```
pub fn eval_ast_with_scope<T: Any + Clone>(
pub fn eval_ast_with_scope<T: Variant + Clone>(
&self,
scope: &mut Scope,
ast: &AST,
@ -803,7 +803,7 @@ impl<'e> Engine<'e> {
.try_cast::<T>()
.map_err(|a| {
EvalAltResult::ErrorMismatchOutputType(
self.map_type_name((*a).type_name()).to_string(),
self.map_type_name(a.type_name()).to_string(),
Position::none(),
)
})
@ -816,7 +816,7 @@ impl<'e> Engine<'e> {
) -> Result<Dynamic, EvalAltResult> {
ast.0
.iter()
.try_fold(().into_dynamic(), |_, stmt| {
.try_fold(Dynamic::from_unit(), |_, stmt| {
self.eval_stmt(scope, Some(ast.1.as_ref()), stmt, 0)
})
.or_else(|err| match err {
@ -875,7 +875,7 @@ impl<'e> Engine<'e> {
) -> Result<(), EvalAltResult> {
ast.0
.iter()
.try_fold(().into_dynamic(), |_, stmt| {
.try_fold(Dynamic::from_unit(), |_, stmt| {
self.eval_stmt(scope, Some(ast.1.as_ref()), stmt, 0)
})
.map(|_| ())
@ -921,7 +921,7 @@ impl<'e> Engine<'e> {
/// # }
/// ```
#[cfg(not(feature = "no_function"))]
pub fn call_fn<A: FuncArgs, T: Any + Clone>(
pub fn call_fn<A: FuncArgs, T: Variant + Clone>(
&self,
scope: &mut Scope,
ast: &AST,
@ -929,7 +929,7 @@ impl<'e> Engine<'e> {
args: A,
) -> Result<T, EvalAltResult> {
let mut arg_values = args.into_vec();
let mut args: Vec<_> = arg_values.iter_mut().map(Dynamic::as_mut).collect();
let mut args: Vec<_> = arg_values.iter_mut().collect();
let fn_lib = Some(ast.1.as_ref());
let pos = Position::none();
@ -937,7 +937,7 @@ impl<'e> Engine<'e> {
.try_cast()
.map_err(|a| {
EvalAltResult::ErrorMismatchOutputType(
self.map_type_name((*a).type_name()).into(),
self.map_type_name(a.type_name()).into(),
pos,
)
})

48
src/builtin.rs
View File

@ -1,7 +1,7 @@
//! Helper module that allows registration of the _core library_ and
//! _standard library_ of utility functions.
use crate::any::{Any, Dynamic};
use crate::any::{Dynamic, Variant};
use crate::engine::{Engine, FUNC_TO_STRING, KEYWORD_DEBUG, KEYWORD_PRINT};
use crate::fn_register::{RegisterDynamicFn, RegisterFn, RegisterResultFn};
use crate::parser::{Position, INT};
@ -628,8 +628,8 @@ impl Engine<'_> {
// Register map access functions
#[cfg(not(feature = "no_index"))]
self.register_fn("keys", |map: Map| {
map.into_iter()
.map(|(k, _)| k.into_dynamic())
map.iter()
.map(|(k, _)| Dynamic::from(k.clone()))
.collect::<Vec<_>>()
});
@ -641,15 +641,16 @@ impl Engine<'_> {
}
// Register range function
fn reg_range<T: Any + Clone>(engine: &mut Engine)
fn reg_range<T: Variant + Clone>(engine: &mut Engine)
where
Range<T>: Iterator<Item = T>,
{
engine.register_iterator::<Range<T>, _>(|a: &Dynamic| {
engine.register_iterator::<Range<T>, _>(|source: &Dynamic| {
Box::new(
a.downcast_ref::<Range<T>>()
source
.downcast_ref::<Range<T>>()
.cloned()
.unwrap()
.clone()
.map(|x| x.into_dynamic()),
) as Box<dyn Iterator<Item = Dynamic>>
});
@ -678,12 +679,12 @@ impl Engine<'_> {
struct StepRange<T>(T, T, T)
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Any + Clone + PartialOrd;
T: Variant + Clone + PartialOrd;
impl<T> Iterator for StepRange<T>
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Any + Clone + PartialOrd,
T: Variant + Clone + PartialOrd,
{
type Item = T;
@ -701,14 +702,15 @@ impl Engine<'_> {
fn reg_step<T>(engine: &mut Engine)
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Any + Clone + PartialOrd,
T: Variant + Clone + PartialOrd,
StepRange<T>: Iterator<Item = T>,
{
engine.register_iterator::<StepRange<T>, _>(|a: &Dynamic| {
engine.register_iterator::<StepRange<T>, _>(|source: &Dynamic| {
Box::new(
a.downcast_ref::<StepRange<T>>()
source
.downcast_ref::<StepRange<T>>()
.cloned()
.unwrap()
.clone()
.map(|x| x.into_dynamic()),
) as Box<dyn Iterator<Item = Dynamic>>
});
@ -866,19 +868,19 @@ impl Engine<'_> {
}
// Register array utility functions
fn push<T: Any>(list: &mut Array, item: T) {
list.push(Box::new(item));
fn push<T: Variant + Clone>(list: &mut Array, item: T) {
list.push(Dynamic::from(item));
}
fn ins<T: Any>(list: &mut Array, position: INT, item: T) {
fn ins<T: Variant + Clone>(list: &mut Array, position: INT, item: T) {
if position <= 0 {
list.insert(0, Box::new(item));
list.insert(0, Dynamic::from(item));
} else if (position as usize) >= list.len() - 1 {
push(list, item);
} else {
list.insert(position as usize, Box::new(item));
list.insert(position as usize, Dynamic::from(item));
}
}
fn pad<T: Any + Clone>(list: &mut Array, len: INT, item: T) {
fn pad<T: Variant + Clone>(list: &mut Array, len: INT, item: T) {
if len >= 0 {
while list.len() < len as usize {
push(list, item.clone());
@ -919,18 +921,18 @@ impl Engine<'_> {
}
self.register_dynamic_fn("pop", |list: &mut Array| {
list.pop().unwrap_or_else(|| ().into_dynamic())
list.pop().unwrap_or_else(|| Dynamic::from_unit())
});
self.register_dynamic_fn("shift", |list: &mut Array| {
if !list.is_empty() {
().into_dynamic()
Dynamic::from_unit()
} else {
list.remove(0)
}
});
self.register_dynamic_fn("remove", |list: &mut Array, len: INT| {
if len < 0 || (len as usize) >= list.len() {
().into_dynamic()
Dynamic::from_unit()
} else {
list.remove(len as usize)
}
@ -951,7 +953,7 @@ impl Engine<'_> {
self.register_fn("len", |map: &mut Map| map.len() as INT);
self.register_fn("clear", |map: &mut Map| map.clear());
self.register_dynamic_fn("remove", |x: &mut Map, name: String| {
x.remove(&name).unwrap_or(().into_dynamic())
x.remove(&name).unwrap_or_else(|| Dynamic::from_unit())
});
self.register_fn("mixin", |map1: &mut Map, map2: Map| {
map2.into_iter().for_each(|(key, value)| {

308
src/engine.rs
View File

@ -1,6 +1,6 @@
//! Main module defining the script evaluation `Engine`.
use crate::any::{Any, AnyExt, Dynamic, Variant};
use crate::any::{Dynamic, Union};
use crate::error::ParseErrorType;
use crate::optimize::OptimizationLevel;
use crate::parser::{Expr, FnDef, Position, ReturnType, Stmt, INT};
@ -8,7 +8,7 @@ use crate::result::EvalAltResult;
use crate::scope::{EntryRef as ScopeSource, EntryType as ScopeEntryType, Scope};
use crate::stdlib::{
any::{type_name, TypeId},
any::TypeId,
borrow::Cow,
boxed::Box,
cmp::Ordering,
@ -19,7 +19,6 @@ use crate::stdlib::{
rc::Rc,
string::{String, ToString},
sync::Arc,
time::Instant,
vec,
vec::Vec,
};
@ -34,7 +33,7 @@ pub type Array = Vec<Dynamic>;
/// Not available under the `no_object` feature.
pub type Map = HashMap<String, Dynamic>;
pub type FnCallArgs<'a> = [&'a mut Variant];
pub type FnCallArgs<'a> = [&'a mut Dynamic];
#[cfg(feature = "sync")]
pub type FnAny = dyn Fn(&mut FnCallArgs, Position) -> Result<Dynamic, EvalAltResult> + Send + Sync;
@ -98,20 +97,20 @@ impl IndexValue {
#[derive(Debug)]
enum Target<'a> {
Scope(ScopeSource<'a>),
Value(&'a mut Variant),
Value(&'a mut Dynamic),
}
impl<'a> Target<'a> {
fn from(value: &'a mut Variant) -> Self {
fn from(value: &'a mut Dynamic) -> Self {
Self::Value(value)
}
fn from_src(src: ScopeSource<'a>) -> Self {
Self::Scope(src)
}
fn get_mut(self, scope: &'a mut Scope) -> &'a mut Variant {
fn get_mut(self, scope: &'a mut Scope) -> &'a mut Dynamic {
match self {
Self::Value(t) => t,
Self::Scope(src) => scope.get_mut(src).as_mut(),
Self::Scope(src) => scope.get_mut(src),
}
}
}
@ -300,7 +299,6 @@ impl Default for Engine<'_> {
max_call_stack_depth: MAX_CALL_STACK_DEPTH,
};
engine.fill_type_names();
engine.register_core_lib();
#[cfg(not(feature = "no_stdlib"))]
@ -353,25 +351,6 @@ fn extract_prop_from_setter(fn_name: &str) -> Option<&str> {
}
impl Engine<'_> {
fn fill_type_names(&mut self) {
// User-friendly names for built-in types
self.type_names = Some(
[
#[cfg(not(feature = "no_index"))]
(type_name::<Array>(), "array"),
#[cfg(not(feature = "no_object"))]
(type_name::<Map>(), "map"),
(type_name::<String>(), "string"),
(type_name::<Instant>(), "timestamp"),
(type_name::<Dynamic>(), "dynamic"),
(type_name::<Variant>(), "variant"),
]
.iter()
.map(|(k, v)| (k.to_string(), v.to_string()))
.collect(),
);
}
/// Create a new `Engine`
pub fn new() -> Self {
Default::default()
@ -400,7 +379,6 @@ impl Engine<'_> {
max_call_stack_depth: MAX_CALL_STACK_DEPTH,
};
engine.fill_type_names();
engine.register_core_lib();
engine
@ -452,7 +430,7 @@ impl Engine<'_> {
fn_def
.params
.iter()
.zip(args.into_iter().map(|x| (*x).into_dynamic()))
.zip(args.into_iter().map(|v| v.clone()))
.map(|(name, value)| (name.clone(), ScopeEntryType::Normal, value)),
);
@ -478,7 +456,7 @@ impl Engine<'_> {
fn_def
.params
.iter()
.zip(args.into_iter().map(|x| (*x).into_dynamic()))
.zip(args.into_iter().map(|v| v.clone()))
.map(|(name, value)| (name, ScopeEntryType::Normal, value)),
);
@ -496,14 +474,13 @@ impl Engine<'_> {
let spec = FnSpec {
name: fn_name.into(),
args: args.iter().map(|a| Any::type_id(*a)).collect(),
args: args.iter().map(|a| a.type_id()).collect(),
};
// Argument must be a string
fn cast_to_string(r: &Variant, pos: Position) -> Result<&str, EvalAltResult> {
r.downcast_ref::<String>()
.map(String::as_str)
.ok_or_else(|| EvalAltResult::ErrorMismatchOutputType(r.type_name().into(), pos))
fn cast_to_string(r: &Dynamic, pos: Position) -> Result<&str, EvalAltResult> {
r.as_str()
.map_err(|type_name| EvalAltResult::ErrorMismatchOutputType(type_name.into(), pos))
}
// Search built-in's and external functions
@ -513,23 +490,26 @@ impl Engine<'_> {
// See if the function match print/debug (which requires special processing)
return match fn_name {
KEYWORD_PRINT if self.on_print.is_some() => Ok(self.on_print.as_ref().unwrap()(
cast_to_string(result.as_ref(), pos)?,
)
.into_dynamic()),
KEYWORD_DEBUG if self.on_debug.is_some() => Ok(self.on_debug.as_ref().unwrap()(
cast_to_string(result.as_ref(), pos)?,
)
.into_dynamic()),
KEYWORD_PRINT | KEYWORD_DEBUG => Ok(().into_dynamic()),
KEYWORD_PRINT if self.on_print.is_some() => {
self.on_print.as_ref().unwrap()(cast_to_string(&result, pos)?);
Ok(Dynamic::from_unit())
}
KEYWORD_DEBUG if self.on_debug.is_some() => {
self.on_debug.as_ref().unwrap()(cast_to_string(&result, pos)?);
Ok(Dynamic::from_unit())
}
KEYWORD_PRINT | KEYWORD_DEBUG => Ok(Dynamic::from_unit()),
_ => Ok(result),
};
}
if let Some(prop) = extract_prop_from_getter(fn_name) {
// Map property access
if let Some(map) = args[0].downcast_ref::<Map>() {
return Ok(map.get(prop).cloned().unwrap_or_else(|| ().into_dynamic()));
if let Ok(map) = args[0].as_map() {
return Ok(map
.get(prop)
.cloned()
.unwrap_or_else(|| Dynamic::from_unit()));
}
// Getter function not found
@ -540,12 +520,12 @@ impl Engine<'_> {
}
if let Some(prop) = extract_prop_from_setter(fn_name) {
let value = args[1].into_dynamic();
let value = args[1].clone();
// Map property update
if let Some(map) = args[0].downcast_mut::<Map>() {
if let Dynamic(Union::Map(map)) = args[0] {
map.insert(prop.to_string(), value);
return Ok(().into_dynamic());
return Ok(Dynamic::from_unit());
}
// Setter function not found
@ -592,9 +572,7 @@ impl Engine<'_> {
let this_ptr = target.get_mut(scope);
let mut args: Vec<_> = once(this_ptr)
.chain(values.iter_mut().map(Dynamic::as_mut))
.collect();
let mut args: Vec<_> = once(this_ptr).chain(values.iter_mut()).collect();
let def_val = def_val.as_ref();
@ -639,7 +617,7 @@ impl Engine<'_> {
let mut args = [target.get_mut(scope)];
self.call_fn_raw(None, fn_lib, &make_getter(id), &mut args, None, *pos, 0)
.and_then(|mut val| {
let target = Target::from(val.as_mut());
let target = Target::from(&mut val);
self.get_dot_val_helper(scope, fn_lib, target, rhs, level)
})
}
@ -667,7 +645,7 @@ impl Engine<'_> {
self.get_indexed_value(scope, fn_lib, &val, idx_expr, *op_pos, level)
.and_then(|(mut val, _, _)| {
let target = Target::from(val.as_mut());
let target = Target::from(&mut val);
self.get_dot_val_helper(scope, fn_lib, target, rhs, level)
})
}
@ -712,7 +690,7 @@ impl Engine<'_> {
Expr::Index(idx_lhs, idx_expr, op_pos) => {
let (idx_src_type, src, index, mut val) =
self.eval_index_expr(scope, fn_lib, idx_lhs, idx_expr, *op_pos, level)?;
let target = Target::from(val.as_mut());
let target = Target::from(&mut val);
let value = self.get_dot_val_helper(scope, fn_lib, target, dot_rhs, level);
// In case the expression mutated `target`, we need to update it back into the scope because it is cloned.
@ -743,7 +721,7 @@ impl Engine<'_> {
// {expr}.???
expr => {
let mut val = self.eval_expr(scope, fn_lib, expr, level)?;
self.get_dot_val_helper(scope, fn_lib, Target::from(val.as_mut()), dot_rhs, level)
self.get_dot_val_helper(scope, fn_lib, Target::from(&mut val), dot_rhs, level)
}
}
}
@ -772,16 +750,21 @@ impl Engine<'_> {
let idx_pos = idx_expr.position();
// val_array[idx]
if let Some(arr) = val.downcast_ref::<Array>() {
if let Ok(arr) = val.as_array() {
let index = self
.eval_expr(scope, fn_lib, idx_expr, level)?
.try_cast::<INT>()
.as_int()
.map_err(|_| EvalAltResult::ErrorNumericIndexExpr(idx_expr.position()))?;
return if index >= 0 {
arr.get(index as usize)
.cloned()
.map(|v| (v, IndexSourceType::Array, IndexValue::from_num(index)))
.map(|v| {
(
v.clone(),
IndexSourceType::Array,
IndexValue::from_num(index),
)
})
.ok_or_else(|| EvalAltResult::ErrorArrayBounds(arr.len(), index, idx_pos))
} else {
Err(EvalAltResult::ErrorArrayBounds(arr.len(), index, idx_pos))
@ -789,26 +772,26 @@ impl Engine<'_> {
}
// val_map[idx]
if let Some(map) = val.downcast_ref::<Map>() {
if let Ok(map) = val.as_map() {
let index = self
.eval_expr(scope, fn_lib, idx_expr, level)?
.try_cast::<String>()
.take_string()
.map_err(|_| EvalAltResult::ErrorStringIndexExpr(idx_expr.position()))?;
return Ok((
map.get(&index)
.cloned()
.unwrap_or_else(|| ().into_dynamic()),
.unwrap_or_else(|| Dynamic::from_unit()),
IndexSourceType::Map,
IndexValue::from_str(index),
));
}
// val_string[idx]
if let Some(s) = val.downcast_ref::<String>() {
if let Ok(s) = val.as_str() {
let index = self
.eval_expr(scope, fn_lib, idx_expr, level)?
.try_cast::<INT>()
.as_int()
.map_err(|_| EvalAltResult::ErrorNumericIndexExpr(idx_expr.position()))?;
return if index >= 0 {
@ -816,7 +799,7 @@ impl Engine<'_> {
.nth(index as usize)
.map(|ch| {
(
ch.into_dynamic(),
Dynamic::from_char(ch),
IndexSourceType::String,
IndexValue::from_num(index),
)
@ -921,14 +904,14 @@ impl Engine<'_> {
IndexSourceType::Array => {
let arr = scope.get_mut_by_type::<Array>(src);
arr[idx.as_num()] = new_val.0;
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
// map_id[idx] = val
IndexSourceType::Map => {
let arr = scope.get_mut_by_type::<Map>(src);
arr.insert(idx.as_str(), new_val.0);
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
// string_id[idx] = val
@ -938,10 +921,10 @@ impl Engine<'_> {
// Value must be a character
let ch = new_val
.0
.try_cast::<char>()
.as_char()
.map_err(|_| EvalAltResult::ErrorCharMismatch(pos))?;
Self::str_replace_char(s, idx.as_num(), ch);
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
IndexSourceType::Expression => panic!("expression cannot be indexed for update"),
@ -955,27 +938,26 @@ impl Engine<'_> {
new_val: Dynamic,
pos: Position,
) -> Result<Dynamic, EvalAltResult> {
if let Some(arr) = target.downcast_mut::<Array>() {
match target {
Dynamic(Union::Array(ref mut arr)) => {
arr[idx.as_num()] = new_val;
return Ok(target);
}
if let Some(map) = target.downcast_mut::<Map>() {
Dynamic(Union::Map(ref mut map)) => {
map.insert(idx.as_str(), new_val);
return Ok(target);
}
if let Some(s) = target.downcast_mut::<String>() {
Dynamic(Union::Str(ref mut s)) => {
// Value must be a character
let ch = new_val
.try_cast::<char>()
.as_char()
.map_err(|_| EvalAltResult::ErrorCharMismatch(pos))?;
Self::str_replace_char(s, idx.as_num(), ch);
return Ok(target);
}
// All other variable types should be an error
_ => panic!("array, map or string source type expected for indexing"),
}
// All other variable types should be an error
panic!("array, map or string source type expected for indexing")
Ok(target)
}
/// Chain-evaluate a dot setter
@ -983,7 +965,7 @@ impl Engine<'_> {
&self,
scope: &mut Scope,
fn_lib: Option<&FunctionsLib>,
this_ptr: &mut Variant,
this_ptr: &mut Dynamic,
dot_rhs: &Expr,
new_val: (&mut Dynamic, Position),
level: usize,
@ -991,7 +973,7 @@ impl Engine<'_> {
match dot_rhs {
// xxx.id
Expr::Property(id, pos) => {
let mut args = [this_ptr, new_val.0.as_mut()];
let mut args = [this_ptr, new_val.0];
self.call_fn_raw(None, fn_lib, &make_setter(id), &mut args, None, *pos, 0)
}
@ -1010,7 +992,7 @@ impl Engine<'_> {
})
.and_then(|mut val| {
let fn_name = make_setter(id);
let mut args = [this_ptr, val.as_mut()];
let mut args = [this_ptr, &mut val];
self.call_fn_raw(None, fn_lib, &fn_name, &mut args, None, *pos, 0)
})
}
@ -1029,13 +1011,12 @@ impl Engine<'_> {
let fn_name = make_getter(id);
self.call_fn_raw(None, fn_lib, &fn_name, &mut [this_ptr], None, *pos, 0)
.and_then(|mut val| {
let value = val.as_mut();
self.set_dot_val_helper(scope, fn_lib, value, rhs, new_val, level)
self.set_dot_val_helper(scope, fn_lib, &mut val, rhs, new_val, level)
.map(|_| val) // Discard Ok return value
})
.and_then(|mut val| {
let fn_name = make_setter(id);
let mut args = [this_ptr, val.as_mut()];
let mut args = [this_ptr, &mut val];
self.call_fn_raw(None, fn_lib, &fn_name, &mut args, None, *pos, 0)
})
}
@ -1053,7 +1034,7 @@ impl Engine<'_> {
)?;
let val_pos = new_val.1;
let this_ptr = value.as_mut();
let this_ptr = &mut value;
self.set_dot_val_helper(
scope, fn_lib, this_ptr, rhs, new_val, level,
)?;
@ -1063,7 +1044,7 @@ impl Engine<'_> {
})
.and_then(|mut v| {
let fn_name = make_setter(id);
let mut args = [this_ptr, v.as_mut()];
let mut args = [this_ptr, &mut v];
self.call_fn_raw(None, fn_lib, &fn_name, &mut args, None, *pos, 0)
})
}
@ -1114,7 +1095,7 @@ impl Engine<'_> {
_ => {
// Avoid referencing scope which is used below as mut
let entry = ScopeSource { name: id, ..src };
let this_ptr = target.as_mut();
let this_ptr = &mut target;
let value = self
.set_dot_val_helper(scope, fn_lib, this_ptr, dot_rhs, new_val, level);
@ -1132,7 +1113,7 @@ impl Engine<'_> {
let (idx_src_type, src, index, mut target) =
self.eval_index_expr(scope, fn_lib, lhs, idx_expr, *op_pos, level)?;
let val_pos = new_val.1;
let this_ptr = target.as_mut();
let this_ptr = &mut target;
let value =
self.set_dot_val_helper(scope, fn_lib, this_ptr, dot_rhs, new_val, level);
@ -1181,18 +1162,18 @@ impl Engine<'_> {
let mut lhs_value = self.eval_expr(scope, fn_lib, lhs, level)?;
let rhs_value = self.eval_expr(scope, fn_lib, rhs, level)?;
if rhs_value.is::<Array>() {
let mut rhs_value = rhs_value.cast::<Array>();
let def_value = false.into_dynamic();
match rhs_value {
Dynamic(Union::Array(mut rhs_value)) => {
let def_value = Dynamic::from_bool(false);
let mut result = false;
// Call the '==' operator to compare each value
for value in rhs_value.iter_mut() {
let args = &mut [lhs_value.as_mut(), value.as_mut()];
let args = &mut [&mut lhs_value, value];
let def_value = Some(&def_value);
if self
.call_fn_raw(None, fn_lib, "==", args, def_value, rhs.position(), level)?
.try_cast::<bool>()
.as_bool()
.unwrap_or(false)
{
result = true;
@ -1200,37 +1181,27 @@ impl Engine<'_> {
}
}
Ok(result.into_dynamic())
} else if rhs_value.is::<Map>() {
let rhs_value = rhs_value.cast::<Map>();
// Only allows String or char
if lhs_value.is::<String>() {
Ok(rhs_value
.contains_key(&lhs_value.cast::<String>())
.into_dynamic())
} else if lhs_value.is::<char>() {
Ok(rhs_value
.contains_key(&lhs_value.cast::<char>().to_string())
.into_dynamic())
} else {
Err(EvalAltResult::ErrorInExpr(lhs.position()))
Ok(Dynamic::from_bool(result))
}
} else if rhs_value.is::<String>() {
let rhs_value = rhs_value.cast::<String>();
Dynamic(Union::Map(rhs_value)) => {
// Only allows String or char
if lhs_value.is::<String>() {
Ok(rhs_value
.contains(&lhs_value.cast::<String>())
.into_dynamic())
} else if lhs_value.is::<char>() {
Ok(rhs_value.contains(lhs_value.cast::<char>()).into_dynamic())
} else {
Err(EvalAltResult::ErrorInExpr(lhs.position()))
match lhs_value {
Dynamic(Union::Str(s)) => Ok(Dynamic::from_bool(rhs_value.contains_key(&s))),
Dynamic(Union::Char(c)) => {
Ok(Dynamic::from_bool(rhs_value.contains_key(&c.to_string())))
}
} else {
Err(EvalAltResult::ErrorInExpr(rhs.position()))
_ => Err(EvalAltResult::ErrorInExpr(lhs.position())),
}
}
Dynamic(Union::Str(rhs_value)) => {
// Only allows String or char
match lhs_value {
Dynamic(Union::Str(s)) => Ok(Dynamic::from_bool(rhs_value.contains(&s))),
Dynamic(Union::Char(c)) => Ok(Dynamic::from_bool(rhs_value.contains(c))),
_ => Err(EvalAltResult::ErrorInExpr(lhs.position())),
}
}
_ => Err(EvalAltResult::ErrorInExpr(rhs.position())),
}
}
@ -1243,10 +1214,11 @@ impl Engine<'_> {
level: usize,
) -> Result<Dynamic, EvalAltResult> {
match expr {
Expr::IntegerConstant(i, _) => Ok(i.into_dynamic()),
Expr::FloatConstant(f, _) => Ok(f.into_dynamic()),
Expr::StringConstant(s, _) => Ok(s.clone().into_owned().into_dynamic()),
Expr::CharConstant(c, _) => Ok(c.into_dynamic()),
Expr::IntegerConstant(i, _) => Ok(Dynamic::from_int(*i)),
#[cfg(not(feature = "no_float"))]
Expr::FloatConstant(f, _) => Ok(Dynamic::from_float(*f)),
Expr::StringConstant(s, _) => Ok(Dynamic::from_string(s.to_string())),
Expr::CharConstant(c, _) => Ok(Dynamic::from_char(*c)),
Expr::Variable(id, pos) => Self::search_scope(scope, id, *pos).map(|(_, val)| val),
Expr::Property(_, _) => panic!("unexpected property."),
@ -1262,7 +1234,7 @@ impl Engine<'_> {
Expr::Variable(name, pos) => match scope.get(name) {
None => {
return Err(EvalAltResult::ErrorVariableNotFound(
name.clone().into_owned(),
name.to_string(),
*pos,
))
}
@ -1358,7 +1330,7 @@ impl Engine<'_> {
.map(|val| arr.push(val))
})?;
Ok((arr).into_dynamic())
Ok(Dynamic(Union::Array(arr)))
}
#[cfg(not(feature = "no_object"))]
@ -1371,7 +1343,7 @@ impl Engine<'_> {
})
})?;
Ok((map).into_dynamic())
Ok(Dynamic(Union::Map(Box::new(map))))
}
Expr::FunctionCall(fn_name, args_expr_list, def_val, pos) => {
@ -1396,10 +1368,9 @@ impl Engine<'_> {
&& !has_override(self, fn_lib, KEYWORD_TYPE_OF) =>
{
let result = self.eval_expr(scope, fn_lib, &args_expr_list[0], level)?;
Ok(self
.map_type_name((*result).type_name())
.to_string()
.into_dynamic())
Ok(Dynamic::from_string(
self.map_type_name(result.type_name()).to_string(),
))
}
// eval
@ -1411,14 +1382,8 @@ impl Engine<'_> {
let result = self.eval_expr(scope, fn_lib, &args_expr_list[0], level)?;
// Get the script text by evaluating the expression
let script = result
.downcast_ref::<String>()
.map(String::as_str)
.ok_or_else(|| {
EvalAltResult::ErrorMismatchOutputType(
result.type_name().into(),
pos,
)
let script = result.as_str().map_err(|type_name| {
EvalAltResult::ErrorMismatchOutputType(type_name.into(), pos)
})?;
// Compile the script text
@ -1461,7 +1426,7 @@ impl Engine<'_> {
.map(|expr| self.eval_expr(scope, fn_lib, expr, level))
.collect::<Result<Vec<_>, _>>()?;
let mut args: Vec<_> = arg_values.iter_mut().map(Dynamic::as_mut).collect();
let mut args: Vec<_> = arg_values.iter_mut().collect();
let def_val = def_val.as_ref();
self.call_fn_raw(None, fn_lib, fn_name, &mut args, def_val, *pos, level)
}
@ -1472,41 +1437,41 @@ impl Engine<'_> {
self.eval_in_expr(scope, fn_lib, lhs.as_ref(), rhs.as_ref(), level)
}
Expr::And(lhs, rhs, _) => Ok(Box::new(
Expr::And(lhs, rhs, _) => Ok(Dynamic::from_bool(
self
.eval_expr(scope, fn_lib,lhs.as_ref(), level)?
.try_cast::<bool>()
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch("AND".into(), lhs.position())
})?
&& // Short-circuit using &&
self
.eval_expr(scope, fn_lib,rhs.as_ref(), level)?
.try_cast::<bool>()
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch("AND".into(), rhs.position())
})?,
)),
Expr::Or(lhs, rhs, _) => Ok(Box::new(
Expr::Or(lhs, rhs, _) => Ok(Dynamic::from_bool(
self
.eval_expr(scope,fn_lib, lhs.as_ref(), level)?
.try_cast::<bool>()
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch("OR".into(), lhs.position())
})?
|| // Short-circuit using ||
self
.eval_expr(scope,fn_lib, rhs.as_ref(), level)?
.try_cast::<bool>()
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch("OR".into(), rhs.position())
})?,
)),
Expr::True(_) => Ok(true.into_dynamic()),
Expr::False(_) => Ok(false.into_dynamic()),
Expr::Unit(_) => Ok(().into_dynamic()),
Expr::True(_) => Ok(Dynamic::from_bool(true)),
Expr::False(_) => Ok(Dynamic::from_bool(false)),
Expr::Unit(_) => Ok(Dynamic::from_unit()),
_ => panic!("should not appear: {:?}", expr),
}
@ -1522,7 +1487,7 @@ impl Engine<'_> {
) -> Result<Dynamic, EvalAltResult> {
match stmt {
// No-op
Stmt::Noop(_) => Ok(().into_dynamic()),
Stmt::Noop(_) => Ok(Dynamic::from_unit()),
// Expression as statement
Stmt::Expr(expr) => {
@ -1532,7 +1497,7 @@ impl Engine<'_> {
result
} else {
// If it is an assignment, erase the result at the root
().into_dynamic()
Dynamic::from_unit()
})
}
@ -1540,7 +1505,7 @@ impl Engine<'_> {
Stmt::Block(block, _) => {
let prev_len = scope.len();
let result = block.iter().try_fold(().into_dynamic(), |_, stmt| {
let result = block.iter().try_fold(Dynamic::from_unit(), |_, stmt| {
self.eval_stmt(scope, fn_lib, stmt, level)
});
@ -1552,7 +1517,7 @@ impl Engine<'_> {
// If-else statement
Stmt::IfThenElse(guard, if_body, else_body) => self
.eval_expr(scope, fn_lib, guard, level)?
.try_cast::<bool>()
.as_bool()
.map_err(|_| EvalAltResult::ErrorLogicGuard(guard.position()))
.and_then(|guard_val| {
if guard_val {
@ -1560,26 +1525,23 @@ impl Engine<'_> {
} else if let Some(stmt) = else_body {
self.eval_stmt(scope, fn_lib, stmt.as_ref(), level)
} else {
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
}),
// While loop
Stmt::While(guard, body) => loop {
match self
.eval_expr(scope, fn_lib, guard, level)?
.try_cast::<bool>()
{
match self.eval_expr(scope, fn_lib, guard, level)?.as_bool() {
Ok(guard_val) if guard_val => {
match self.eval_stmt(scope, fn_lib, body, level) {
Ok(_) | Err(EvalAltResult::ErrorLoopBreak(false, _)) => (),
Err(EvalAltResult::ErrorLoopBreak(true, _)) => {
return Ok(().into_dynamic())
return Ok(Dynamic::from_unit())
}
Err(x) => return Err(x),
}
}
Ok(_) => return Ok(().into_dynamic()),
Ok(_) => return Ok(Dynamic::from_unit()),
Err(_) => return Err(EvalAltResult::ErrorLogicGuard(guard.position())),
}
},
@ -1588,7 +1550,7 @@ impl Engine<'_> {
Stmt::Loop(body) => loop {
match self.eval_stmt(scope, fn_lib, body, level) {
Ok(_) | Err(EvalAltResult::ErrorLoopBreak(false, _)) => (),
Err(EvalAltResult::ErrorLoopBreak(true, _)) => return Ok(().into_dynamic()),
Err(EvalAltResult::ErrorLoopBreak(true, _)) => return Ok(Dynamic::from_unit()),
Err(x) => return Err(x),
}
},
@ -1596,7 +1558,7 @@ impl Engine<'_> {
// For loop
Stmt::For(name, expr, body) => {
let arr = self.eval_expr(scope, fn_lib, expr, level)?;
let tid = Any::type_id(arr.as_ref());
let tid = arr.type_id();
if let Some(iter_fn) = self.type_iterators.as_ref().and_then(|t| t.get(&tid)) {
// Add the loop variable - variable name is copied
@ -1620,7 +1582,7 @@ impl Engine<'_> {
}
scope.rewind(scope.len() - 1);
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
} else {
Err(EvalAltResult::ErrorFor(expr.position()))
}
@ -1634,7 +1596,7 @@ impl Engine<'_> {
// Empty return
Stmt::ReturnWithVal(None, ReturnType::Return, pos) => {
Err(EvalAltResult::Return(().into_dynamic(), *pos))
Err(EvalAltResult::Return(Dynamic::from_unit(), *pos))
}
// Return value
@ -1652,7 +1614,7 @@ impl Engine<'_> {
Stmt::ReturnWithVal(Some(a), ReturnType::Exception, pos) => {
let val = self.eval_expr(scope, fn_lib, a, level)?;
Err(EvalAltResult::ErrorRuntime(
val.try_cast::<String>().unwrap_or_else(|_| "".to_string()),
val.take_string().unwrap_or_else(|_| "".to_string()),
*pos,
))
}
@ -1662,13 +1624,13 @@ impl Engine<'_> {
let val = self.eval_expr(scope, fn_lib, expr, level)?;
// TODO - avoid copying variable name in inner block?
scope.push_dynamic_value(name.clone(), ScopeEntryType::Normal, val, false);
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
Stmt::Let(name, None, _) => {
// TODO - avoid copying variable name in inner block?
scope.push(name.clone(), ());
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
// Const statement
@ -1676,7 +1638,7 @@ impl Engine<'_> {
let val = self.eval_expr(scope, fn_lib, expr, level)?;
// TODO - avoid copying variable name in inner block?
scope.push_dynamic_value(name.clone(), ScopeEntryType::Constant, val, true);
Ok(().into_dynamic())
Ok(Dynamic::from_unit())
}
Stmt::Const(_, _, _) => panic!("constant expression not constant!"),

5
src/fn_call.rs
View File

@ -2,8 +2,7 @@
#![allow(non_snake_case)]
use crate::any::{Any, Dynamic};
use crate::any::{Dynamic, Variant};
use crate::stdlib::{string::String, vec, vec::Vec};
/// Trait that represent arguments to a function call.
@ -18,7 +17,7 @@ pub trait FuncArgs {
/// converted into `Dynamic`).
macro_rules! impl_args {
($($p:ident),*) => {
impl<$($p: Any + Clone),*> FuncArgs for ($($p,)*)
impl<$($p: Variant + Clone),*> FuncArgs for ($($p,)*)
{
fn into_vec(self) -> Vec<Dynamic> {
let ($($p,)*) = self;

4
src/fn_func.rs
View File

@ -2,7 +2,7 @@
#![cfg(not(feature = "no_function"))]
#![allow(non_snake_case)]
use crate::any::Any;
use crate::any::Variant;
use crate::engine::Engine;
use crate::error::ParseError;
use crate::parser::AST;
@ -88,7 +88,7 @@ macro_rules! def_anonymous_fn {
def_anonymous_fn!(imp);
};
(imp $($par:ident),*) => {
impl<'e, $($par: Any + Clone,)* RET: Any + Clone> Func<($($par,)*), RET> for Engine<'e>
impl<'e, $($par: Variant + Clone,)* RET: Variant + Clone> Func<($($par,)*), RET> for Engine<'e>
{
#[cfg(feature = "sync")]
type Output = Box<dyn Fn($($par),*) -> Result<RET, EvalAltResult> + Send + Sync + 'e>;

24
src/fn_register.rs
View File

@ -2,7 +2,7 @@
#![allow(non_snake_case)]
use crate::any::{Any, Dynamic};
use crate::any::{Dynamic, Variant};
use crate::engine::{Engine, FnCallArgs};
use crate::parser::Position;
use crate::result::EvalAltResult;
@ -53,7 +53,7 @@ pub trait RegisterDynamicFn<FN, ARGS> {
///
/// // Function that returns a Dynamic value
/// fn return_the_same_as_dynamic(x: i64) -> Dynamic {
/// Box::new(x)
/// Dynamic::from(x)
/// }
///
/// let mut engine = Engine::new();
@ -137,7 +137,7 @@ macro_rules! def_register {
// ^ function parameter actual type (T, &T or &mut T)
// ^ dereferencing function
impl<
$($par: Any + Clone,)*
$($par: Variant + Clone,)*
#[cfg(feature = "sync")]
FN: Fn($($param),*) -> RET + Send + Sync + 'static,
@ -145,7 +145,7 @@ macro_rules! def_register {
#[cfg(not(feature = "sync"))]
FN: Fn($($param),*) -> RET + 'static,
RET: Any
RET: Variant + Clone
> RegisterFn<FN, ($($mark,)*), RET> for Engine<'_>
{
fn register_fn(&mut self, name: &str, f: FN) {
@ -163,13 +163,13 @@ macro_rules! def_register {
let mut drain = args.iter_mut();
$(
// Downcast every element, return in case of a type mismatch
let $par = drain.next().unwrap().downcast_mut::<$par>().unwrap();
let $par: &mut $par = drain.next().unwrap().downcast_mut().unwrap();
)*
// Call the user-supplied function using ($clone) to
// potentially clone the value, otherwise pass the reference.
let r = f($(($clone)($par)),*);
Ok(Box::new(r) as Dynamic)
Ok(r.into_dynamic())
};
self.register_fn_raw(name, vec![$(TypeId::of::<$par>()),*], Box::new(func));
@ -177,7 +177,7 @@ macro_rules! def_register {
}
impl<
$($par: Any + Clone,)*
$($par: Variant + Clone,)*
#[cfg(feature = "sync")]
FN: Fn($($param),*) -> Dynamic + Send + Sync + 'static,
@ -201,7 +201,7 @@ macro_rules! def_register {
let mut drain = args.iter_mut();
$(
// Downcast every element, return in case of a type mismatch
let $par = drain.next().unwrap().downcast_mut::<$par>().unwrap();
let $par: &mut $par = drain.next().unwrap().downcast_mut().unwrap();
)*
// Call the user-supplied function using ($clone) to
@ -213,14 +213,14 @@ macro_rules! def_register {
}
impl<
$($par: Any + Clone,)*
$($par: Variant + Clone,)*
#[cfg(feature = "sync")]
FN: Fn($($param),*) -> Result<RET, EvalAltResult> + Send + Sync + 'static,
#[cfg(not(feature = "sync"))]
FN: Fn($($param),*) -> Result<RET, EvalAltResult> + 'static,
RET: Any
RET: Variant + Clone
> RegisterResultFn<FN, ($($mark,)*), RET> for Engine<'_>
{
fn register_result_fn(&mut self, name: &str, f: FN) {
@ -238,12 +238,12 @@ macro_rules! def_register {
let mut drain = args.iter_mut();
$(
// Downcast every element, return in case of a type mismatch
let $par = drain.next().unwrap().downcast_mut::<$par>().unwrap();
let $par: &mut $par = drain.next().unwrap().downcast_mut().unwrap();
)*
// Call the user-supplied function using ($clone) to
// potentially clone the value, otherwise pass the reference.
f($(($clone)($par)),*).map(|r| Box::new(r) as Dynamic)
f($(($clone)($par)),*).map(|r| r.into_dynamic())
.map_err(|err| err.set_position(pos))
};
self.register_fn_raw(name, vec![$(TypeId::of::<$par>()),*], Box::new(func));

2
src/lib.rs
View File

@ -83,7 +83,7 @@ mod result;
mod scope;
mod stdlib;
pub use any::{Any, AnyExt, Dynamic, Variant};
pub use any::Dynamic;
pub use engine::Engine;
pub use error::{ParseError, ParseErrorType};
pub use fn_call::FuncArgs;

8
src/optimize.rs
View File

@ -1,4 +1,4 @@
use crate::any::{Any, Dynamic};
use crate::any::Dynamic;
use crate::engine::{
Engine, FnAny, FnCallArgs, FnSpec, FunctionsLib, KEYWORD_DEBUG, KEYWORD_EVAL, KEYWORD_PRINT,
KEYWORD_TYPE_OF,
@ -116,7 +116,7 @@ fn call_fn(
) -> Result<Option<Dynamic>, EvalAltResult> {
let spec = FnSpec {
name: fn_name.into(),
args: args.iter().map(|a| Any::type_id(*a)).collect(),
args: args.iter().map(|a| a.type_id()).collect(),
};
// Search built-in's and external functions
@ -570,7 +570,7 @@ fn optimize_expr<'a>(expr: Expr, state: &mut State<'a>) -> Expr {
}
let mut arg_values: Vec<_> = args.iter().map(Expr::get_constant_value).collect();
let mut call_args: Vec<_> = arg_values.iter_mut().map(Dynamic::as_mut).collect();
let mut call_args: Vec<_> = arg_values.iter_mut().collect();
// Save the typename of the first argument if it is `type_of()`
// This is to avoid `call_args` being passed into the closure
@ -585,7 +585,7 @@ fn optimize_expr<'a>(expr: Expr, state: &mut State<'a>) -> Expr {
result.or_else(|| {
if !arg_for_type_of.is_empty() {
// Handle `type_of()`
Some(arg_for_type_of.to_string().into_dynamic())
Some(Dynamic::from_string(arg_for_type_of.to_string()))
} else {
// Otherwise use the default value, if any
def_value.clone()

108
src/parser.rs
View File

@ -1,7 +1,7 @@
//! Main module defining the lexer and parser.
use crate::any::{Any, AnyExt, Dynamic};
use crate::engine::{Array, Engine, FunctionsLib, Map};
use crate::any::{Dynamic, Union};
use crate::engine::{Engine, FunctionsLib};
use crate::error::{LexError, ParseError, ParseErrorType};
use crate::optimize::{optimize_into_ast, OptimizationLevel};
use crate::scope::{EntryType as ScopeEntryType, Scope};
@ -440,25 +440,30 @@ impl Expr {
/// Panics when the expression is not constant.
pub fn get_constant_value(&self) -> Dynamic {
match self {
Self::IntegerConstant(i, _) => i.into_dynamic(),
Self::FloatConstant(f, _) => f.into_dynamic(),
Self::CharConstant(c, _) => c.into_dynamic(),
Self::StringConstant(s, _) => s.clone().into_owned().into_dynamic(),
Self::True(_) => true.into_dynamic(),
Self::False(_) => false.into_dynamic(),
Self::Unit(_) => ().into_dynamic(),
Self::IntegerConstant(i, _) => Dynamic::from_int(*i),
#[cfg(not(feature = "no_float"))]
Self::FloatConstant(f, _) => Dynamic::from_float(*f),
Self::CharConstant(c, _) => Dynamic::from_char(*c),
Self::StringConstant(s, _) => Dynamic::from_string(s.to_string()),
Self::True(_) => Dynamic::from_bool(true),
Self::False(_) => Dynamic::from_bool(false),
Self::Unit(_) => Dynamic::from_unit(),
Self::Array(items, _) if items.iter().all(Self::is_constant) => items
Self::Array(items, _) if items.iter().all(Self::is_constant) => Dynamic(Union::Array(
items
.iter()
.map(Self::get_constant_value)
.collect::<Vec<_>>()
.into_dynamic(),
.collect::<Vec<_>>(),
)),
Self::Map(items, _) if items.iter().all(|(_, v, _)| v.is_constant()) => items
Self::Map(items, _) if items.iter().all(|(_, v, _)| v.is_constant()) => {
Dynamic(Union::Map(Box::new(
items
.iter()
.map(|(k, v, _)| (k.clone(), v.get_constant_value()))
.collect::<HashMap<_, _>>()
.into_dynamic(),
.collect::<HashMap<_, _>>(),
)))
}
_ => panic!("cannot get value of non-constant expression"),
}
@ -1958,7 +1963,7 @@ fn parse_unary<'a>(
Ok(Expr::FunctionCall(
"!".into(),
vec![parse_primary(input, allow_stmt_expr)?],
Some(Box::new(false)), // NOT operator, when operating on invalid operand, defaults to false
Some(Dynamic::from_bool(false)), // NOT operator, when operating on invalid operand, defaults to false
pos,
))
}
@ -2270,37 +2275,37 @@ fn parse_binary_op<'a>(
Token::EqualsTo => Expr::FunctionCall(
"==".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
Token::NotEqualsTo => Expr::FunctionCall(
"!=".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
Token::LessThan => Expr::FunctionCall(
"<".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
Token::LessThanEqualsTo => Expr::FunctionCall(
"<=".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
Token::GreaterThan => Expr::FunctionCall(
">".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
Token::GreaterThanEqualsTo => Expr::FunctionCall(
">=".into(),
vec![current_lhs, rhs],
Some((false).into_dynamic()),
Some(Dynamic::from_bool(false)),
pos,
),
@ -2845,67 +2850,50 @@ pub fn parse<'a, 'e>(
///
/// Returns Some(expression) if conversion is successful. Otherwise None.
pub fn map_dynamic_to_expr(value: Dynamic, pos: Position) -> Option<Expr> {
if value.is::<INT>() {
Some(Expr::IntegerConstant(value.cast(), pos))
} else if value.is::<char>() {
Some(Expr::CharConstant(value.cast(), pos))
} else if value.is::<String>() {
Some(Expr::StringConstant(value.cast::<String>().into(), pos))
} else if value.is::<bool>() {
Some(if value.cast::<bool>() {
Expr::True(pos)
} else {
Expr::False(pos)
})
} else {
match value.0 {
Union::Unit(_) => Some(Expr::Unit(pos)),
Union::Int(value) => Some(Expr::IntegerConstant(value, pos)),
Union::Char(value) => Some(Expr::CharConstant(value, pos)),
Union::Str(value) => Some(Expr::StringConstant(value.into(), pos)),
Union::Bool(true) => Some(Expr::True(pos)),
Union::Bool(false) => Some(Expr::False(pos)),
#[cfg(not(feature = "no_index"))]
{
if value.is::<Array>() {
let array = value.cast::<Array>();
Union::Array(array) => {
let items: Vec<_> = array
.into_iter()
.map(|x| map_dynamic_to_expr(x, pos))
.collect();
if items.iter().all(Option::is_some) {
return Some(Expr::Array(
Some(Expr::Array(
items.into_iter().map(Option::unwrap).collect(),
pos,
));
))
} else {
return None;
None
}
}
}
#[cfg(not(feature = "no_object"))]
{
if value.is::<Map>() {
let map = value.cast::<Map>();
Union::Map(map) => {
let items: Vec<_> = map
.into_iter()
.map(|(k, v)| (k, map_dynamic_to_expr(v, pos), pos))
.collect();
if items.iter().all(|(_, expr, _)| expr.is_some()) {
return Some(Expr::Map(
Some(Expr::Map(
items
.into_iter()
.map(|(k, expr, pos)| (k, expr.unwrap(), pos))
.collect(),
pos,
));
))
} else {
return None;
}
}
}
#[cfg(not(feature = "no_float"))]
{
if value.is::<FLOAT>() {
return Some(Expr::FloatConstant(value.cast(), pos));
}
}
None
}
}
#[cfg(not(feature = "no_float"))]
Union::Float(value) => Some(Expr::FloatConstant(value, pos)),
_ => None,
}
}

35
src/scope.rs
View File

@ -1,6 +1,6 @@
//! Module that defines the `Scope` type representing a function call-stack scope.
use crate::any::{Any, Dynamic};
use crate::any::{Dynamic, Variant};
use crate::parser::{map_dynamic_to_expr, Expr, Position};
use crate::stdlib::{
@ -20,7 +20,7 @@ pub enum EntryType {
}
/// An entry in the Scope.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub struct Entry<'a> {
/// Name of the entry.
pub name: Cow<'a, str>,
@ -68,7 +68,7 @@ pub(crate) struct EntryRef<'a> {
/// allowing for automatic _shadowing_.
///
/// Currently, `Scope` is neither `Send` nor `Sync`. Turn on the `sync` feature to make it `Send + Sync`.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub struct Scope<'a>(Vec<Entry<'a>>);
impl<'a> Scope<'a> {
@ -157,8 +157,8 @@ impl<'a> Scope<'a> {
/// my_scope.push("x", 42_i64);
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 42);
/// ```
pub fn push<K: Into<Cow<'a, str>>, T: Any + Clone>(&mut self, name: K, value: T) {
self.push_dynamic_value(name, EntryType::Normal, value.into_dynamic(), false);
pub fn push<K: Into<Cow<'a, str>>, T: Variant + Clone>(&mut self, name: K, value: T) {
self.push_dynamic_value(name, EntryType::Normal, Dynamic::from(value), false);
}
/// Add (push) a new `Dynamic` entry to the Scope.
@ -166,11 +166,11 @@ impl<'a> Scope<'a> {
/// # Examples
///
/// ```
/// use rhai::{Any, Scope};
/// use rhai::{Dynamic, Scope};
///
/// let mut my_scope = Scope::new();
///
/// my_scope.push_dynamic("x", (42_i64).into_dynamic());
/// my_scope.push_dynamic("x", Dynamic::from(42_i64));
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 42);
/// ```
pub fn push_dynamic<K: Into<Cow<'a, str>>>(&mut self, name: K, value: Dynamic) {
@ -195,8 +195,8 @@ impl<'a> Scope<'a> {
/// my_scope.push_constant("x", 42_i64);
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 42);
/// ```
pub fn push_constant<K: Into<Cow<'a, str>>, T: Any + Clone>(&mut self, name: K, value: T) {
self.push_dynamic_value(name, EntryType::Constant, value.into_dynamic(), true);
pub fn push_constant<K: Into<Cow<'a, str>>, T: Variant + Clone>(&mut self, name: K, value: T) {
self.push_dynamic_value(name, EntryType::Constant, Dynamic::from(value), true);
}
/// Add (push) a new constant with a `Dynamic` value to the Scope.
@ -211,11 +211,11 @@ impl<'a> Scope<'a> {
/// # Examples
///
/// ```
/// use rhai::{Any, Scope};
/// use rhai::{Dynamic, Scope};
///
/// let mut my_scope = Scope::new();
///
/// my_scope.push_constant_dynamic("x", (42_i64).into_dynamic());
/// my_scope.push_constant_dynamic("x", Dynamic::from(42_i64));
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 42);
/// ```
pub fn push_constant_dynamic<K: Into<Cow<'a, str>>>(&mut self, name: K, value: Dynamic) {
@ -336,13 +336,12 @@ impl<'a> Scope<'a> {
/// my_scope.push("x", 42_i64);
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 42);
/// ```
pub fn get_value<T: Any + Clone>(&self, name: &str) -> Option<T> {
pub fn get_value<T: Variant + Clone>(&self, name: &str) -> Option<T> {
self.0
.iter()
.rev()
.find(|Entry { name: key, .. }| name == key)
.and_then(|Entry { value, .. }| value.downcast_ref::<T>())
.map(T::clone)
.and_then(|Entry { value, .. }| value.downcast_ref::<T>().cloned())
}
/// Update the value of the named entry.
@ -366,7 +365,7 @@ impl<'a> Scope<'a> {
/// my_scope.set_value("x", 0_i64);
/// assert_eq!(my_scope.get_value::<i64>("x").unwrap(), 0);
/// ```
pub fn set_value<T: Any + Clone>(&mut self, name: &'a str, value: T) {
pub fn set_value<T: Variant + Clone>(&mut self, name: &'a str, value: T) {
match self.get(name) {
Some((
EntryRef {
@ -382,8 +381,8 @@ impl<'a> Scope<'a> {
..
},
_,
)) => self.0.get_mut(index).unwrap().value = value.into_dynamic(),
None => self.push(name, value.into_dynamic()),
)) => self.0.get_mut(index).unwrap().value = Dynamic::from(value),
None => self.push(name, value),
}
}
@ -403,7 +402,7 @@ impl<'a> Scope<'a> {
}
/// Get a mutable reference to an entry in the Scope and downcast it to a specific type
pub(crate) fn get_mut_by_type<T: Any + Clone>(&mut self, key: EntryRef) -> &mut T {
pub(crate) fn get_mut_by_type<T: Variant + Clone>(&mut self, key: EntryRef) -> &mut T {
self.get_mut(key)
.downcast_mut::<T>()
.expect("wrong type cast")

2
tests/maps.rs
View File

@ -1,6 +1,6 @@
#![cfg(not(feature = "no_object"))]
use rhai::{AnyExt, Engine, EvalAltResult, Map, Scope, INT};
use rhai::{Engine, EvalAltResult, Map, Scope, INT};
#[test]
fn test_map_indexing() -> Result<(), EvalAltResult> {