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Assert that DOM structs have the correct first field

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DOM structs embed their parent type as their first field. This
introduces a `.parent()` method to the DOM struct that returns its first
field, and codegens a type assert that ensures that `.parent()` returns
the parent struct.

This generates:

On `#[dom_struct]`:

```rust
impl HasParent for Type {
    type Parent = ParentType;
    fn as_parent(&self) -> ParentType {
        &self.first_field
    }
}
```

In the codegen files:

```rust
impl Type {
    fn __assert_parent_type(&self) {
        let _: &ParentType = self.as_parent();
    }
}
````
This commit is contained in:
Manish Goregaokar 2018-06-29 10:34:09 -07:00
parent e2fca1b228
commit ad198993b1
6 changed files with 109 additions and 9 deletions
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4
Cargo.lock generated
View file

@ -722,6 +722,10 @@ dependencies = [
[[package]]
name = "dom_struct"
version = "0.0.1"
dependencies = [
"quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
"syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "domobject_derive"