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Module resolver returns shared module.

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This commit is contained in:
Stephen Chung
2020-11-07 23:33:21 +08:00
parent d5d70367fa
commit b3d318ef7f
20 changed files with 158 additions and 136 deletions
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15
doc/src/rust/modules/imp-resolver.md
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@@ -13,7 +13,7 @@ which contains only one function: `resolve`.
When Rhai prepares to load a module, `ModuleResolver::resolve` is called with the name
of the _module path_ (i.e. the path specified in the [`import`] statement).
* Upon success, it should return a [`Module`].
* Upon success, it should return an [`Rc<Module>`][module] (or `Arc<Module>` under [`sync`]).
* If the path does not resolve to a valid module, return `EvalAltResult::ErrorModuleNotFound`.
@@ -37,14 +37,15 @@ impl ModuleResolver for MyModuleResolver {
engine: &Engine, // reference to the current 'Engine'
path: &str, // the module path
pos: Position, // position of the 'import' statement
) -> Result<Module, Box<EvalAltResult>> {
) -> Result<Rc<Module>, Box<EvalAltResult>> {
// Check module path.
if is_valid_module_path(path) {
// Load the custom module.
load_secret_module(path).map_err(|err|
// Return EvalAltResult::ErrorInModule upon loading error
EvalAltResult::ErrorInModule(err.to_string(), pos).into()
)
load_secret_module(path) // load the custom module
.map(Rc::new) // share it
.map_err(|err|
// Return EvalAltResult::ErrorInModule upon loading error
EvalAltResult::ErrorInModule(err.to_string(), pos).into()
)
} else {
// Return EvalAltResult::ErrorModuleNotFound if the path is invalid
Err(EvalAltResult::ErrorModuleNotFound(path.into(), pos).into())

6
doc/src/rust/modules/resolvers.md
View File

@@ -29,6 +29,8 @@ Loads a script file (based off the current directory) with `.rhai` extension.
All functions in the _global_ namespace, plus all those defined in the same module,
are _merged_ into a _unified_ namespace.
Modules are also _cached_ so a script file is only evaluated _once_, even when repeatedly imported.
```rust
------------------
| my_module.rhai |
@@ -122,10 +124,6 @@ m::greet(); // prints "hello! from module!"
The base directory can be changed via the `FileModuleResolver::new_with_path` constructor function.
### Returning a module instead
`FileModuleResolver::create_module` loads a script file and returns a module with the standard behavior.
`StaticModuleResolver`
---------------------