github/boa - boa - 帆软第三方插件仓库

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Author	SHA1	Message	Date
Iban Eguia Moraza	540aa2be4f	Initial version of a JS -> Rust conversion trait. (#2276 ) This Pull Request closes #1975. It's still a work in progress, but tries to go in that direction. It changes the following: - Adds a new `TryFromJs` trait, that can be derived using a new `boa_derive` crate. - Adds a new `try_js_into()` function that, similarly to the standard library `TryInto` trait Things to think about: - Should the `boa_derive` crate be re-exported in `boa_engine` using a `derive` feature, similar to how it's done in `serde`? - The current implementation only converts perfectly valid values. So, if we try to convert a big integer into an `i8`, or any floating point number to an `f32`. So, you cannot derive `TryFromJs` for structures that contain an `f32` for example (you can still manually implement the trait, though, and decide in favour of a loss of precision). Should we also provide some traits for transparent loss of precision? - Currently, you cannot convert between types, so if the JS struct has an integer, you cannot cast it to a boolean, for example. Should we provide a `TryConvertJs` trait, for example to force conversions? - Currently we only have basic types and object conversions. Should add `Array` to `Vec` conversion, for example, right? Should we also add `TypedArray` conversions? What about `Map` and `Set`? Does this step over the fine grained APIs that we were creating? Note that this still requires a bunch of documentation, tests, and validation from the dev team and from the users that requested this feature. I'm particularly interested in @lastmjs's thoughts on this API. I already added an usage example in `boa_examples/src/bin/derive.rs`. Co-authored-by: jedel1043 <jedel0124@gmail.com>	2 years ago

Author

SHA1

Message

Date

Iban Eguia Moraza

540aa2be4f

Initial version of a JS -> Rust conversion trait. (#2276 )

This Pull Request closes #1975. It's still a work in progress, but tries to go in that direction.

It changes the following:

- Adds a new `TryFromJs` trait, that can be derived using a new `boa_derive` crate.
- Adds a new `try_js_into()` function that, similarly to the standard library `TryInto` trait

Things to think about:
- Should the `boa_derive` crate be re-exported in `boa_engine` using a `derive` feature, similar to how it's done in `serde`?
- The current implementation only converts perfectly valid values. So, if we try to convert a big integer into an `i8`, or any floating point number to an `f32`. So, you cannot derive `TryFromJs` for structures that contain an `f32` for example (you can still manually implement the trait, though, and decide in favour of a loss of precision). Should we also provide some traits for transparent loss of precision?
- Currently, you cannot convert between types, so if the JS struct has an integer, you cannot cast it to a boolean, for example. Should we provide a `TryConvertJs` trait, for example to force conversions?
- Currently we only have basic types and object conversions. Should add `Array` to `Vec` conversion, for example, right? Should we also add `TypedArray` conversions? What about `Map` and `Set`? Does this step over the fine grained APIs that we were creating?

Note that this still requires a bunch of documentation, tests, and validation from the dev team and from the users that requested this feature. I'm particularly interested in @lastmjs's thoughts on this API.

I already added an usage example in `boa_examples/src/bin/derive.rs`.

Co-authored-by: jedel1043 <jedel0124@gmail.com>

2 years ago

1 Commits (1b67e5d6070f0d3e6da36eb3ccb193ce2f8656ce)