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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. 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
Variables are declared using the `let` keyword. 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. 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. 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.