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Add object override idea

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Markus Scully 2024-11-14 23:41:02 +00:00
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@ -143,6 +143,16 @@ let
An empty object, `{}`, acts as the unit type for Vanth. When a function returns no value and is only used for its side-effects, its return type is `{}`. This is equivalent to `()` in Rust.
### Overrides
An object can be dereferenced with `.{ /* ... */ }` to create a new object with fields inherited from another object, with some of them possible changed. This is like an overlay in Nix.
```va
let x = { .inner = { .a = 6; .b = 8; .sum = $.a + $.b }; };
let y = x.inner.{ .b = 10; }.sum; // y is now `16`
```
### Variables
Variables are declared using the `let` keyword.
@ -546,6 +556,6 @@ The `@doc` annotation is used to provide documentation for values and types.
Strings inside it, e.g. `@doc("this function fixes things")` can use interpolation, `@doc("example usage: {foo(5, 6)}")`. Specifically for strings in `@doc`, these expressions are not expanded but rather printed verbatim. The interpreter still checks that they evaluate successfully, otherwise the docs fail to compile.
# Licenses
## Licenses
Modules have a `Module.license: String` property, as well as a `Module.allowLicenses` and `Module.denyLicenses` property. I don't know what the types of these properties will be yet. Modules will only build successfully if the license of every one of their dependencies recursively satisfies the specified license requirements.