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Add new &Module parameter to native functions.

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This commit is contained in:
Stephen Chung 2020-07-06 12:04:02 +08:00
parent 495d202af4
commit ea86888638
10 changed files with 107 additions and 99 deletions
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28
doc/src/engine/call-fn.md
View File

@ -56,19 +56,20 @@ let result: () = engine.call_fn(&mut scope, &ast, "hidden", ())?;
```
`Engine::call_fn_dynamic`
------------------------
Low-Level API - `Engine::call_fn_dynamic`
----------------------------------------
For more control, construct all arguments as `Dynamic` values and use `Engine::call_fn_dynamic`, passing it
anything that implements `IntoIterator<Item = Dynamic>` (such as a simple `Vec<Dynamic>`):
anything that implements `AsMut<Dynamic>` (such as a simple array or a `Vec<Dynamic>`):
```rust
let result: Dynamic = engine.call_fn_dynamic(
&mut scope, // scope to use
&ast, // AST to use
"hello", // function entry-point
None, // 'this' pointer, if any
[ String::from("abc").into(), 123_i64.into() ])?; // arguments
let result = engine.call_fn_dynamic(
&mut scope, // scope to use
ast.into(), // get 'Module' from 'AST'
"hello", // function entry-point
None, // 'this' pointer, if any
[ String::from("abc").into(), 123_i64.into() ] // arguments
)?;
```
@ -82,8 +83,13 @@ let ast = engine.compile("fn action(x) { this += x; }")?;
let mut value: Dynamic = 1_i64.into();
let result = engine.call_fn_dynamic(&mut scope, &ast, "action", Some(&mut value), [ 41_i64.into() ])?;
// ^^^^^^^^^^^^^^^^ binding the 'this' pointer
let result = engine.call_fn_dynamic(
&mut scope,
ast.into(),
"action",
Some(&mut value), // binding the 'this' pointer
[ 41_i64.into() ]
)?;
assert_eq!(value.as_int().unwrap(), 42);
```

78
src/api.rs
View File

@ -6,6 +6,7 @@ use crate::error::ParseError;
use crate::fn_call::FuncArgs;
use crate::fn_native::{IteratorFn, SendSync};
use crate::fn_register::RegisterFn;
use crate::module::Module;
use crate::optimize::{optimize_into_ast, OptimizationLevel};
use crate::parser::AST;
use crate::result::EvalAltResult;
@ -53,10 +54,10 @@ impl Engine {
name: &str,
args: &[TypeId],
#[cfg(not(feature = "sync"))] func: impl Fn(&Engine, &mut [&mut Dynamic]) -> Result<Dynamic, Box<EvalAltResult>>
#[cfg(not(feature = "sync"))] func: impl Fn(&Engine, &Module, &mut [&mut Dynamic]) -> Result<Dynamic, Box<EvalAltResult>>
+ 'static,
#[cfg(feature = "sync")] func: impl Fn(&Engine, &mut [&mut Dynamic]) -> Result<Dynamic, Box<EvalAltResult>>
#[cfg(feature = "sync")] func: impl Fn(&Engine, &Module, &mut [&mut Dynamic]) -> Result<Dynamic, Box<EvalAltResult>>
+ Send
+ Sync
+ 'static,
@ -459,7 +460,7 @@ impl Engine {
self.register_indexer_set(setter);
}
/// Compile a string into an [`AST`], which can be used later for evaluation.
/// Compile a string into an `AST`, which can be used later for evaluation.
///
/// # Example
///
@ -482,7 +483,7 @@ impl Engine {
self.compile_with_scope(&Scope::new(), script)
}
/// Compile a string into an [`AST`] using own scope, which can be used later for evaluation.
/// Compile a string into an `AST` using own scope, which can be used later for evaluation.
///
/// The scope is useful for passing constants into the script for optimization
/// when using `OptimizationLevel::Full`.
@ -525,7 +526,7 @@ impl Engine {
}
/// When passed a list of strings, first join the strings into one large script,
/// and then compile them into an [`AST`] using own scope, which can be used later for evaluation.
/// and then compile them into an `AST` using own scope, which can be used later for evaluation.
///
/// The scope is useful for passing constants into the script for optimization
/// when using `OptimizationLevel::Full`.
@ -578,7 +579,7 @@ impl Engine {
self.compile_with_scope_and_optimization_level(scope, scripts, self.optimization_level)
}
/// Join a list of strings and compile into an [`AST`] using own scope at a specific optimization level.
/// Join a list of strings and compile into an `AST` using own scope at a specific optimization level.
pub(crate) fn compile_with_scope_and_optimization_level(
&self,
scope: &Scope,
@ -614,7 +615,7 @@ impl Engine {
Ok(contents)
}
/// Compile a script file into an [`AST`], which can be used later for evaluation.
/// Compile a script file into an `AST`, which can be used later for evaluation.
///
/// # Example
///
@ -640,7 +641,7 @@ impl Engine {
self.compile_file_with_scope(&Scope::new(), path)
}
/// Compile a script file into an [`AST`] using own scope, which can be used later for evaluation.
/// Compile a script file into an `AST` using own scope, which can be used later for evaluation.
///
/// The scope is useful for passing constants into the script for optimization
/// when using `OptimizationLevel::Full`.
@ -722,7 +723,7 @@ impl Engine {
self.eval_ast_with_scope(&mut scope, &ast)
}
/// Compile a string containing an expression into an [`AST`],
/// Compile a string containing an expression into an `AST`,
/// which can be used later for evaluation.
///
/// # Example
@ -746,7 +747,7 @@ impl Engine {
self.compile_expression_with_scope(&Scope::new(), script)
}
/// Compile a string containing an expression into an [`AST`] using own scope,
/// Compile a string containing an expression into an `AST` using own scope,
/// which can be used later for evaluation.
///
/// The scope is useful for passing constants into the script for optimization
@ -954,7 +955,7 @@ impl Engine {
self.eval_ast_with_scope(scope, &ast)
}
/// Evaluate an [`AST`].
/// Evaluate an `AST`.
///
/// # Example
///
@ -976,7 +977,7 @@ impl Engine {
self.eval_ast_with_scope(&mut Scope::new(), ast)
}
/// Evaluate an [`AST`] with own scope.
/// Evaluate an `AST` with own scope.
///
/// # Example
///
@ -1024,7 +1025,7 @@ impl Engine {
});
}
/// Evaluate an [`AST`] with own scope.
/// Evaluate an `AST` with own scope.
pub(crate) fn eval_ast_with_scope_raw<'a>(
&self,
scope: &mut Scope,
@ -1090,7 +1091,7 @@ impl Engine {
self.consume_ast_with_scope(&mut Scope::new(), ast)
}
/// Evaluate an [`AST`] with own scope, but throw away the result and only return error (if any).
/// Evaluate an `AST` with own scope, but throw away the result and only return error (if any).
/// Useful for when you don't need the result, but still need to keep track of possible errors.
pub fn consume_ast_with_scope(
&self,
@ -1114,7 +1115,7 @@ impl Engine {
)
}
/// Call a script function defined in an [`AST`] with multiple arguments.
/// Call a script function defined in an `AST` with multiple arguments.
/// Arguments are passed as a tuple.
///
/// # Example
@ -1159,7 +1160,8 @@ impl Engine {
args: A,
) -> Result<T, Box<EvalAltResult>> {
let mut arg_values = args.into_vec();
let result = self.call_fn_dynamic_raw(scope, ast, name, &mut None, arg_values.as_mut())?;
let result =
self.call_fn_dynamic_raw(scope, ast.lib(), name, &mut None, arg_values.as_mut())?;
let typ = self.map_type_name(result.type_name());
@ -1172,7 +1174,7 @@ impl Engine {
});
}
/// Call a script function defined in an [`AST`] with multiple `Dynamic` arguments
/// Call a script function defined in an `AST` with multiple `Dynamic` arguments
/// and optionally a value for binding to the 'this' pointer.
///
/// ## WARNING
@ -1203,19 +1205,19 @@ impl Engine {
/// scope.push("foo", 42_i64);
///
/// // Call the script-defined function
/// let result = engine.call_fn_dynamic(&mut scope, &ast, "add", None, [ String::from("abc").into(), 123_i64.into() ])?;
/// // ^^^^ no 'this' pointer
/// let result = engine.call_fn_dynamic(&mut scope, ast.into(), "add", None, [ String::from("abc").into(), 123_i64.into() ])?;
/// // ^^^^ no 'this' pointer
/// assert_eq!(result.cast::<i64>(), 168);
///
/// let result = engine.call_fn_dynamic(&mut scope, &ast, "add1", None, [ String::from("abc").into() ])?;
/// let result = engine.call_fn_dynamic(&mut scope, ast.into(), "add1", None, [ String::from("abc").into() ])?;
/// assert_eq!(result.cast::<i64>(), 46);
///
/// let result = engine.call_fn_dynamic(&mut scope, &ast, "bar", None, [])?;
/// let result = engine.call_fn_dynamic(&mut scope, ast.into(), "bar", None, [])?;
/// assert_eq!(result.cast::<i64>(), 21);
///
/// let mut value: Dynamic = 1_i64.into();
/// let result = engine.call_fn_dynamic(&mut scope, &ast, "action", Some(&mut value), [ 41_i64.into() ])?;
/// // ^^^^^^^^^^^^^^^^ binding the 'this' pointer
/// let result = engine.call_fn_dynamic(&mut scope, ast.into(), "action", Some(&mut value), [ 41_i64.into() ])?;
/// // ^^^^^^^^^^^^^^^^ binding the 'this' pointer
/// assert_eq!(value.as_int().unwrap(), 42);
/// # }
/// # Ok(())
@ -1225,15 +1227,15 @@ impl Engine {
pub fn call_fn_dynamic(
&self,
scope: &mut Scope,
ast: &AST,
lib: &Module,
name: &str,
mut this_ptr: Option<&mut Dynamic>,
mut arg_values: impl AsMut<[Dynamic]>,
) -> Result<Dynamic, Box<EvalAltResult>> {
self.call_fn_dynamic_raw(scope, ast, name, &mut this_ptr, arg_values.as_mut())
self.call_fn_dynamic_raw(scope, lib, name, &mut this_ptr, arg_values.as_mut())
}
/// Call a script function defined in an [`AST`] with multiple `Dynamic` arguments.
/// Call a script function defined in an `AST` with multiple `Dynamic` arguments.
///
/// ## WARNING
///
@ -1245,14 +1247,14 @@ impl Engine {
pub(crate) fn call_fn_dynamic_raw(
&self,
scope: &mut Scope,
ast: &AST,
lib: &Module,
name: &str,
this_ptr: &mut Option<&mut Dynamic>,
arg_values: &mut [Dynamic],
) -> Result<Dynamic, Box<EvalAltResult>> {
let mut args: StaticVec<_> = arg_values.iter_mut().collect();
let fn_def = get_script_function_by_signature(ast.lib(), name, args.len(), true)
.ok_or_else(|| {
let fn_def =
get_script_function_by_signature(lib, name, args.len(), true).ok_or_else(|| {
Box::new(EvalAltResult::ErrorFunctionNotFound(
name.into(),
Position::none(),
@ -1264,27 +1266,19 @@ impl Engine {
let args = args.as_mut();
self.call_script_fn(
scope,
&mut mods,
&mut state,
ast.lib(),
this_ptr,
name,
fn_def,
args,
0,
scope, &mut mods, &mut state, lib, this_ptr, name, fn_def, args, 0,
)
}
/// Optimize the [`AST`] with constants defined in an external Scope.
/// An optimized copy of the [`AST`] is returned while the original [`AST`] is consumed.
/// Optimize the `AST` with constants defined in an external Scope.
/// An optimized copy of the `AST` is returned while the original `AST` is consumed.
///
/// Although optimization is performed by default during compilation, sometimes it is necessary to
/// _re_-optimize an AST. For example, when working with constants that are passed in via an
/// external scope, it will be more efficient to optimize the [`AST`] once again to take advantage
/// external scope, it will be more efficient to optimize the `AST` once again to take advantage
/// of the new constants.
///
/// With this method, it is no longer necessary to recompile a large script. The script [`AST`] can be
/// With this method, it is no longer necessary to recompile a large script. The script `AST` can be
/// compiled just once. Before evaluation, constants are passed into the `Engine` via an external scope
/// (i.e. with `scope.push_constant(...)`). Then, the `AST is cloned and the copy re-optimized before running.
#[cfg(not(feature = "no_optimize"))]

9
src/engine.rs
View File

@ -661,7 +661,7 @@ impl Engine {
}
// Run external function
let result = func.get_native_fn()(self, args)?;
let result = func.get_native_fn()(self, lib, args)?;
// Restore the original reference
restore_first_arg(old_this_ptr, args);
@ -1616,7 +1616,7 @@ impl Engine {
.or_else(|| self.packages.get_fn(hash_fn))
{
// Overriding exact implementation
func(self, &mut [lhs_ptr, &mut rhs_val])?;
func(self, lib, &mut [lhs_ptr, &mut rhs_val])?;
} else if run_builtin_op_assignment(op, lhs_ptr, &rhs_val)?.is_none() {
// Not built in, map to `var = var op rhs`
let op = &op[..op.len() - 1]; // extract operator without =
@ -1885,9 +1885,8 @@ impl Engine {
)
.map_err(|err| err.new_position(*pos))
}
Ok(f) => {
f.get_native_fn()(self, args.as_mut()).map_err(|err| err.new_position(*pos))
}
Ok(f) => f.get_native_fn()(self, lib, args.as_mut())
.map_err(|err| err.new_position(*pos)),
Err(err) => match *err {
EvalAltResult::ErrorFunctionNotFound(_, _) if def_val.is_some() => {
Ok(def_val.clone().unwrap())

5
src/fn_native.rs
View File

@ -1,5 +1,6 @@
use crate::any::Dynamic;
use crate::engine::Engine;
use crate::module::Module;
use crate::parser::ScriptFnDef;
use crate::result::EvalAltResult;
use crate::utils::ImmutableString;
@ -79,11 +80,11 @@ impl<S: Into<ImmutableString>> From<S> for FnPtr {
/// A general function trail object.
#[cfg(not(feature = "sync"))]
pub type FnAny = dyn Fn(&Engine, &mut FnCallArgs) -> Result<Dynamic, Box<EvalAltResult>>;
pub type FnAny = dyn Fn(&Engine, &Module, &mut FnCallArgs) -> Result<Dynamic, Box<EvalAltResult>>;
/// A general function trail object.
#[cfg(feature = "sync")]
pub type FnAny =
dyn Fn(&Engine, &mut FnCallArgs) -> Result<Dynamic, Box<EvalAltResult>> + Send + Sync;
dyn Fn(&Engine, &Module, &mut FnCallArgs) -> Result<Dynamic, Box<EvalAltResult>> + Send + Sync;
/// A standard function that gets an iterator from a type.
pub type IteratorFn = fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>>;

3
src/fn_register.rs
View File

@ -4,6 +4,7 @@
use crate::any::{Dynamic, Variant};
use crate::engine::Engine;
use crate::fn_native::{CallableFunction, FnAny, FnCallArgs, SendSync};
use crate::module::Module;
use crate::parser::FnAccess;
use crate::result::EvalAltResult;
use crate::utils::ImmutableString;
@ -119,7 +120,7 @@ macro_rules! make_func {
// ^ function parameter generic type name (A, B, C etc.)
// ^ dereferencing function
Box::new(move |_: &Engine, args: &mut FnCallArgs| {
Box::new(move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
// The arguments are assumed to be of the correct number and types!
#[allow(unused_variables, unused_mut)]

28
src/module.rs
View File

@ -373,9 +373,11 @@ impl Module {
&mut self,
name: impl Into<String>,
args: &[TypeId],
func: impl Fn(&Engine, &mut [&mut Dynamic]) -> FuncReturn<T> + SendSync + 'static,
func: impl Fn(&Engine, &Module, &mut [&mut Dynamic]) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |engine: &Engine, args: &mut FnCallArgs| func(engine, args).map(Dynamic::from);
let f = move |engine: &Engine, lib: &Module, args: &mut FnCallArgs| {
func(engine, lib, args).map(Dynamic::from)
};
self.set_fn(
name,
Public,
@ -402,7 +404,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn() -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, _: &mut FnCallArgs| func().map(Dynamic::from);
let f = move |_: &Engine, _: &Module, _: &mut FnCallArgs| func().map(Dynamic::from);
let args = [];
self.set_fn(
name,
@ -430,7 +432,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(A) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
func(mem::take(args[0]).cast::<A>()).map(Dynamic::from)
};
let args = [TypeId::of::<A>()];
@ -460,7 +462,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(&mut A) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
func(args[0].downcast_mut::<A>().unwrap()).map(Dynamic::from)
};
let args = [TypeId::of::<A>()];
@ -514,7 +516,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(A, B) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let a = mem::take(args[0]).cast::<A>();
let b = mem::take(args[1]).cast::<B>();
@ -550,7 +552,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(&mut A, B) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let b = mem::take(args[1]).cast::<B>();
let a = args[0].downcast_mut::<A>().unwrap();
@ -641,7 +643,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(A, B, C) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let a = mem::take(args[0]).cast::<A>();
let b = mem::take(args[1]).cast::<B>();
let c = mem::take(args[2]).cast::<C>();
@ -683,7 +685,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(&mut A, B, C) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let b = mem::take(args[1]).cast::<B>();
let c = mem::take(args[2]).cast::<C>();
let a = args[0].downcast_mut::<A>().unwrap();
@ -720,7 +722,7 @@ impl Module {
&mut self,
func: impl Fn(&mut A, B, A) -> FuncReturn<()> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let b = mem::take(args[1]).cast::<B>();
let c = mem::take(args[2]).cast::<A>();
let a = args[0].downcast_mut::<A>().unwrap();
@ -762,7 +764,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(A, B, C, D) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let a = mem::take(args[0]).cast::<A>();
let b = mem::take(args[1]).cast::<B>();
let c = mem::take(args[2]).cast::<C>();
@ -811,7 +813,7 @@ impl Module {
name: impl Into<String>,
func: impl Fn(&mut A, B, C, D) -> FuncReturn<T> + SendSync + 'static,
) -> u64 {
let f = move |_: &Engine, args: &mut FnCallArgs| {
let f = move |_: &Engine, _: &Module, args: &mut FnCallArgs| {
let b = mem::take(args[1]).cast::<B>();
let c = mem::take(args[2]).cast::<C>();
let d = mem::take(args[3]).cast::<D>();
@ -942,7 +944,7 @@ impl Module {
.map(|f| f.get_shared_fn_def())
}
/// Create a new `Module` by evaluating an [`AST`].
/// Create a new `Module` by evaluating an `AST`.
///
/// # Examples
///

8
src/packages/array_basic.rs
View File

@ -3,7 +3,7 @@
use crate::any::{Dynamic, Variant};
use crate::def_package;
use crate::engine::{Array, Engine};
use crate::module::FuncReturn;
use crate::module::{FuncReturn, Module};
use crate::parser::{ImmutableString, INT};
use crate::result::EvalAltResult;
use crate::token::Position;
@ -25,7 +25,11 @@ fn ins<T: Variant + Clone>(list: &mut Array, position: INT, item: T) -> FuncRetu
}
Ok(())
}
fn pad<T: Variant + Clone>(engine: &Engine, args: &mut [&mut Dynamic]) -> FuncReturn<()> {
fn pad<T: Variant + Clone>(
engine: &Engine,
_: &Module,
args: &mut [&mut Dynamic],
) -> FuncReturn<()> {
let len = *args[1].downcast_ref::<INT>().unwrap();
// Check if array will be over max size limit

4
src/packages/string_more.rs
View File

@ -1,7 +1,7 @@
use crate::any::Dynamic;
use crate::def_package;
use crate::engine::Engine;
use crate::module::FuncReturn;
use crate::module::{FuncReturn, Module};
use crate::parser::{ImmutableString, INT};
use crate::result::EvalAltResult;
use crate::token::Position;
@ -226,7 +226,7 @@ def_package!(crate:MoreStringPackage:"Additional string utilities, including str
lib.set_fn_var_args(
"pad",
&[TypeId::of::<ImmutableString>(), TypeId::of::<INT>(), TypeId::of::<char>()],
|engine: &Engine, args: &mut [&mut Dynamic]| {
|engine: &Engine, _: &Module, args: &mut [&mut Dynamic]| {
let len = *args[1].downcast_ref::< INT>().unwrap();
// Check if string will be over max size limit

6
src/parser.rs
View File

@ -298,6 +298,12 @@ impl Add<Self> for &AST {
}
}
impl<'a> From<&'a AST> for &'a Module {
fn from(ast: &'a AST) -> Self {
ast.lib()
}
}
/// A type representing the access mode of a scripted function.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub enum FnAccess {

37
tests/call_fn.rs
View File

@ -1,6 +1,7 @@
#![cfg(not(feature = "no_function"))]
use rhai::{
Dynamic, Engine, EvalAltResult, Func, ImmutableString, ParseError, ParseErrorType, Scope, INT,
Dynamic, Engine, EvalAltResult, Func, ImmutableString, Module, ParseError, ParseErrorType,
Scope, INT,
};
#[test]
@ -117,17 +118,6 @@ fn test_anonymous_fn() -> Result<(), Box<EvalAltResult>> {
fn test_fn_ptr() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
let ast = engine.compile(
r#"
fn foo(x) { this += x; }
let x = 41;
x.bar("foo", 1);
x
"#,
)?;
let ast_clone = ast.clone();
engine.register_raw_fn(
"bar",
&[
@ -135,24 +125,29 @@ fn test_fn_ptr() -> Result<(), Box<EvalAltResult>> {
std::any::TypeId::of::<ImmutableString>(),
std::any::TypeId::of::<INT>(),
],
move |engine: &Engine, args: &mut [&mut Dynamic]| {
move |engine: &Engine, lib: &Module, args: &mut [&mut Dynamic]| {
let callback = args[1].clone().cast::<ImmutableString>();
let value = args[2].clone();
let this_ptr = args.get_mut(0).unwrap();
engine.call_fn_dynamic(
&mut Scope::new(),
&ast_clone,
&callback,
Some(this_ptr),
[value],
)?;
engine.call_fn_dynamic(&mut Scope::new(), lib, &callback, Some(this_ptr), [value])?;
Ok(().into())
},
);
assert_eq!(engine.eval_ast::<INT>(&ast)?, 42);
assert_eq!(
engine.eval::<INT>(
r#"
fn foo(x) { this += x; }
let x = 41;
x.bar("foo", 1);
x
"#
)?,
42
);
Ok(())
}