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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,201 @@ | ||
| //! Traits and utilities for extract Rust data from JavaScript values | ||
| //! | ||
| //! The full list of included extractors can be found on [`TryFromJs`]. | ||
| //! | ||
| //! ## Extracting Handles | ||
| //! | ||
| //! JavaScript arguments may be extracted into a Rust tuple. | ||
| //! | ||
| //! ``` | ||
| //! # use neon::{prelude::*, types::extract::*}; | ||
| //! fn greet(mut cx: FunctionContext) -> JsResult<JsString> { | ||
| //! let (greeting, name): (Handle<JsString>, Handle<JsString>) = cx.args()?; | ||
| //! let message = format!("{}, {}!", greeting.value(&mut cx), name.value(&mut cx)); | ||
| //! | ||
| //! Ok(cx.string(message)) | ||
| //! } | ||
| //! ``` | ||
| //! | ||
| //! ## Extracting Native Types | ||
| //! | ||
| //! It's also possible to extract directly into native Rust types instead of a [`Handle`]. | ||
| //! | ||
| //! ``` | ||
| //! # use neon::{prelude::*, types::extract::*}; | ||
| //! fn add(mut cx: FunctionContext) -> JsResult<JsNumber> { | ||
| //! let (number(a), number(b)) = cx.args()?; | ||
| //! | ||
| //! Ok(cx.number(a + b)) | ||
| //! } | ||
| //! ``` | ||
| //! | ||
| //! ## Extracting [`Option`] | ||
| //! | ||
| //! It's also possible to mix [`Handle`], Rust types, and even [`Option`] for | ||
| //! handling `null` and `undefined`. | ||
| //! | ||
| //! ``` | ||
| //! # use neon::{prelude::*, types::extract::*}; | ||
| //! fn get_or_default(mut cx: FunctionContext) -> JsResult<JsValue> { | ||
| //! let (Opt::<f64>(n), Val::<JsValue>(default_value)) = cx.args()?; | ||
| //! | ||
| //! if let Some(n) = n { | ||
| //! return Ok(cx.number(n).upcast()); | ||
| //! } | ||
| //! | ||
| //! Ok(default_value) | ||
| //! } | ||
| //! ``` | ||
| //! | ||
| //! ## Additional Extractors | ||
| //! | ||
| //! In some cases, the expected JavaScript type is ambiguous. For example, when | ||
| //! trying to extract an [`f64`], the argument may be a `Date` instead of a `number`. | ||
| //! Newtype extractors are provided to help. | ||
| //! | ||
| //! ``` | ||
| //! # use neon::{prelude::*, types::extract::*}; | ||
| //! # #[cfg(feature = "napi-5")] | ||
| //! # use neon::types::JsDate; | ||
| //! | ||
| //! # #[cfg(feature = "napi-5")] | ||
| //! fn add_hours(mut cx: FunctionContext) -> JsResult<JsDate> { | ||
| //! const MS_PER_HOUR: f64 = 60.0 * 60.0 * 1000.0; | ||
| //! | ||
| //! let (Date(date), number(hours)) = cx.args()?; | ||
| //! let date = date + hours * MS_PER_HOUR; | ||
| //! | ||
| //! cx.date(date).or_throw(&mut cx) | ||
| //! } | ||
| //! ``` | ||
| //! | ||
| //! ## Overloaded Functions | ||
| //! | ||
| //! It's common in JavaScript to overload function signatures. This can be implemented with | ||
| //! [`FunctionContext::args_opt`] or [`Context::try_catch`]. | ||
| //! | ||
| //! ``` | ||
| //! # use neon::{prelude::*, types::extract::*}; | ||
| //! | ||
| //! fn add(mut cx: FunctionContext, a: f64, b: f64) -> Handle<JsNumber> { | ||
| //! cx.number(a + b) | ||
| //! } | ||
| //! | ||
| //! fn concat(mut cx: FunctionContext, a: String, b: String) -> Handle<JsString> { | ||
| //! cx.string(a + &b) | ||
| //! } | ||
| //! | ||
| //! fn combine(mut cx: FunctionContext) -> JsResult<JsValue> { | ||
| //! if let Some((a, b)) = cx.args_opt()? { | ||
| //! return Ok(add(cx, a, b).upcast()); | ||
| //! } | ||
| //! | ||
| //! let (a, b) = cx.args()?; | ||
| //! | ||
| //! Ok(concat(cx, a, b).upcast()) | ||
| //! } | ||
| //! ``` | ||
| //! | ||
| //! Note well, in this example, type annotations are not required on the tuple because | ||
| //! Rust is able to infer it from the type arguments on `add` and `concat`. | ||
|
|
||
| use crate::{ | ||
| context::{Context, FunctionContext}, | ||
| handle::Handle, | ||
| result::NeonResult, | ||
| types::JsValue, | ||
| }; | ||
|
|
||
| pub use self::types::*; | ||
|
|
||
| mod types; | ||
|
|
||
| /// Extract Rust data from a JavaScript value | ||
| pub trait TryFromJs<'cx>: private::Sealed + Sized { | ||
| type Error; | ||
|
|
||
| fn try_from_js<C>(cx: &mut C, v: Handle<'cx, JsValue>) -> NeonResult<Result<Self, Self::Error>> | ||
| where | ||
| C: Context<'cx>; | ||
|
|
||
| fn from_js<C>(cx: &mut C, v: Handle<'cx, JsValue>) -> NeonResult<Self> | ||
| where | ||
| C: Context<'cx>; | ||
| } | ||
|
|
||
| /// Trait specifying values that may be extracted from function arguments. | ||
| /// | ||
| /// **Note:** This trait is implemented for tuples of up to 32 values, but for | ||
| /// the sake of brevity, only tuples up to size 8 are shown in this documentation. | ||
| pub trait FromArgs<'cx>: private::FromArgsInternal<'cx> {} | ||
|
|
||
| macro_rules! impl_arguments { | ||
| ($(#[$attrs:meta])? [$($head:ident),*], []) => {}; | ||
|
|
||
| ($(#[$attrs:meta])? [$($head:ident),*], [$cur:ident $(, $tail:ident)*]) => { | ||
| $(#[$attrs])? | ||
| impl<'cx, $($head,)* $cur> FromArgs<'cx> for ($($head,)* $cur,) | ||
| where | ||
| $($head: TryFromJs<'cx>,)* | ||
| $cur: TryFromJs<'cx>, | ||
| {} | ||
|
|
||
| impl<'cx, $($head,)* $cur> private::FromArgsInternal<'cx> for ($($head,)* $cur,) | ||
| where | ||
| $($head: TryFromJs<'cx>,)* | ||
| $cur: TryFromJs<'cx>, | ||
| { | ||
| fn from_args(cx: &mut FunctionContext<'cx>) -> NeonResult<Self> { | ||
| #[allow(non_snake_case)] | ||
| let [$($head,)* $cur] = cx.argv(); | ||
|
|
||
| Ok(( | ||
| $($head::from_js(cx, $head)?,)* | ||
| $cur::from_js(cx, $cur)?, | ||
| )) | ||
| } | ||
|
|
||
| fn from_args_opt(cx: &mut FunctionContext<'cx>) -> NeonResult<Option<Self>> { | ||
| #[allow(non_snake_case)] | ||
| let [$($head,)* $cur] = cx.argv(); | ||
|
|
||
| Ok(Some(( | ||
| $( | ||
| match $head::try_from_js(cx, $head)? { | ||
| Ok(v) => v, | ||
| Err(_) => return Ok(None), | ||
| }, | ||
| )* | ||
| match $cur::try_from_js(cx, $cur)? { | ||
| Ok(v) => v, | ||
| Err(_) => return Ok(None), | ||
| }, | ||
| ))) | ||
| } | ||
| } | ||
|
|
||
| impl_arguments!($(#[$attrs])? [$($head,)* $cur], [$($tail),*]); | ||
| }; | ||
| } | ||
|
|
||
| impl_arguments!([], [T1, T2, T3, T4, T5, T6, T7, T8]); | ||
| impl_arguments!( | ||
| #[doc(hidden)] | ||
| [T1, T2, T3, T4, T5, T6, T7, T8], | ||
| [ | ||
| T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, | ||
| T27, T28, T29, T30, T31, T32 | ||
| ] | ||
| ); | ||
|
|
||
| mod private { | ||
| use crate::{context::FunctionContext, result::NeonResult}; | ||
|
|
||
| pub trait Sealed {} | ||
|
|
||
| pub trait FromArgsInternal<'cx>: Sized { | ||
| fn from_args(cx: &mut FunctionContext<'cx>) -> NeonResult<Self>; | ||
|
|
||
| fn from_args_opt(cx: &mut FunctionContext<'cx>) -> NeonResult<Option<Self>>; | ||
| } | ||
| } |
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