Merge pull request #35 from Brooooooklyn/try-from

refactor(napi-rs): impl TryFrom instead of TryInto

README.md

@@ -126,10 +126,10 @@ npm test
 | [napi_create_symbol](https://nodejs.org/api/n-api.html#n_api_napi_create_symbol) | 1            | v8.0.0               | ⛔️      |
 | [napi_create_typedarray](https://nodejs.org/api/n-api.html#n_api_napi_create_typedarray) | 1            | v8.0.0               | ⛔️      |
 | [napi_create_dataview](https://nodejs.org/api/n-api.html#n_api_napi_create_dataview) | 1            | v8.3.0               | ⛔️      |
-| [napi_create_int32](https://nodejs.org/api/n-api.html#n_api_napi_create_int32) | 1            | v8.4.0               | ⛔️      |
+| [napi_create_int32](https://nodejs.org/api/n-api.html#n_api_napi_create_int32) | 1            | v8.4.0               | ✅      |
 | [napi_create_uint32](https://nodejs.org/api/n-api.html#n_api_napi_create_uint32) | 1            | v8.4.0               | ✅      |
 | [napi_create_int64](https://nodejs.org/api/n-api.html#n_api_napi_create_int64) | 1            | v8.4.0               | ✅      |
-| [napi_create_double](https://nodejs.org/api/n-api.html#n_api_napi_create_double) | 1            | v8.4.0               | ⛔️      |
+| [napi_create_double](https://nodejs.org/api/n-api.html#n_api_napi_create_double) | 1            | v8.4.0               | ✅      |
 | [napi_create_bigint_int64](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_int64) | 6            | v10.7.0              | ⛔️      |
 | [napi_create_bigint_uint64](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_uint64) | 6            | v10.7.0              | ⛔️      |
 | [napi_create_bigint_words](https://nodejs.org/api/n-api.html#n_api_napi_create_bigint_words) | 6            | v10.7.0              | ⛔️      |
@@ -154,12 +154,12 @@ npm test
 |[napi_get_value_bigint_uint64](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_uint64)| 6 | v10.7.0 | ⛔️ |
 |[napi_get_value_bigint_words](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_words)| 6 | v10.7.0 | ⛔️ |
 |[napi_get_value_external](https://nodejs.org/api/n-api.html#n_api_napi_get_value_external)| 1 | v8.0.0 | ⛔️ |
-|[napi_get_value_int32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_int32)| 1 | v8.0.0 | ⛔️ |
+|[napi_get_value_int32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_int32)| 1 | v8.0.0 | ✅ |
 |[napi_get_value_int64](https://nodejs.org/api/n-api.html#n_api_napi_get_value_int64)| 1 | v8.0.0 | ✅ |
 |[napi_get_value_string_latin1](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_latin1)| 1 | v8.0.0 | ⛔️ |
 |[napi_get_value_string_utf8](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_utf8)| 1 | v8.0.0 | ✅ |
 |[napi_get_value_string_utf16](https://nodejs.org/api/n-api.html#n_api_napi_get_value_string_utf16)| 1 | v8.0.0 | ✅ |
-|[napi_get_value_uint32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_uint32)| 1 | v8.0.0 | ⛔️ |
+|[napi_get_value_uint32](https://nodejs.org/api/n-api.html#n_api_napi_get_value_uint32)| 1 | v8.0.0 | ✅ |
 |[napi_get_boolean](https://nodejs.org/api/n-api.html#n_api_napi_get_boolean)| 1 | v8.0.0 | ✅ |
 |[napi_get_global](https://nodejs.org/api/n-api.html#n_api_napi_get_global)| 1 | v8.0.0 | ⛔️ |
 |[napi_get_null](https://nodejs.org/api/n-api.html#n_api_napi_get_null)| 1 | v8.0.0 | ✅ |

napi-derive-example/src/lib.rs

@@ -3,7 +3,7 @@ extern crate napi_rs as napi;
 #[macro_use]
 extern crate napi_derive;
 
-use napi::{Any, Env, Error, Object, Result, Status, Value, CallContext, Number};
+use napi::{Any, CallContext, Env, Error, Number, Object, Result, Status, Value};
 use std::convert::TryInto;
 
 register_module!(test_module, init);
@@ -12,22 +12,14 @@ fn init<'env>(
   env: &'env Env,
   exports: &'env mut Value<'env, Object>,
 ) -> Result<Option<Value<'env, Object>>> {
-  exports.set_named_property(
+  exports.set_named_property("testThrow", env.create_function("testThrow", test_throw)?)?;
-    "testThrow",
-    env.create_function("testThrow", test_throw)?,
-  )?;
 
-  exports.set_named_property(
+  exports.set_named_property("fibonacci", env.create_function("fibonacci", fibonacci)?)?;
-    "fibonacci",
-    env.create_function("fibonacci", fibonacci)?,
-  )?;
   Ok(None)
 }
 
 #[js_function]
-fn test_throw<'a>(
+fn test_throw<'a>(_ctx: CallContext) -> Result<Value<'a, Any>> {
-  _ctx: CallContext,
-) -> Result<Value<'a, Any>> {
   Err(Error::new(Status::GenericFailure))
 }
 
@@ -41,6 +33,6 @@ fn fibonacci<'env>(ctx: CallContext<'env>) -> Result<Value<'env, Number>> {
 fn fibonacci_native(n: i64) -> i64 {
   match n {
     1 | 2 => 1,
-    _ => fibonacci_native(n - 1) + fibonacci_native(n - 2)
+    _ => fibonacci_native(n - 1) + fibonacci_native(n - 2),
   }
 }

napi-derive/src/lib.rs

@@ -2,11 +2,11 @@ extern crate proc_macro;
 
 use proc_macro::TokenStream;
 use proc_macro2::{Ident, Literal};
-use quote::{quote, format_ident};
+use quote::{format_ident, quote};
-use syn::fold::{fold_signature, fold_fn_arg, Fold};
+use syn::fold::{fold_fn_arg, fold_signature, Fold};
 use syn::parse::{Parse, ParseStream, Result};
 use syn::punctuated::Punctuated;
-use syn::{parse_macro_input, FnArg, ItemFn, Signature, Block, Token};
+use syn::{parse_macro_input, Block, FnArg, ItemFn, Signature, Token};
 
 struct ArgLength {
   length: Option<Literal>,

napi/src/call_context.rs

@@ -1,4 +1,4 @@
-use crate::{Any, Value, Env, ValueType, Error, Status, Result, sys};
+use crate::{sys, Any, Env, Error, Result, Status, Value, ValueType};
 
 pub struct CallContext<'env, T: ValueType = Any> {
   pub env: &'env Env,
@@ -7,9 +7,19 @@ pub struct CallContext<'env, T: ValueType = Any> {
   arg_len: usize,
 }
 
-impl <'env, T: ValueType> CallContext <'env, T> {
+impl<'env, T: ValueType> CallContext<'env, T> {
-  pub fn new(env: &'env Env, this: sys::napi_value, args: [sys::napi_value; 8], arg_len: usize) -> Result<Self> {
+  pub fn new(
-    Ok(Self { env, this: Value::<'env, T>::from_raw(env, this)?, args, arg_len })
+    env: &'env Env,
+    this: sys::napi_value,
+    args: [sys::napi_value; 8],
+    arg_len: usize,
+  ) -> Result<Self> {
+    Ok(Self {
+      env,
+      this: Value::<'env, T>::from_raw(env, this)?,
+      args,
+      arg_len,
+    })
   }
 
   pub fn get<ArgType: ValueType>(&'env self, index: usize) -> Result<Value<'env, ArgType>> {

napi/src/lib.rs

@@ -1,7 +1,7 @@
 extern crate futures;
 
 use std::any::TypeId;
-use std::convert::TryInto;
+use std::convert::{TryFrom, TryInto};
 use std::ffi::CString;
 use std::marker::PhantomData;
 use std::mem;
@@ -11,9 +11,9 @@ use std::ptr;
 use std::slice;
 use std::string::String as RustString;
 
+mod call_context;
 mod executor;
 pub mod sys;
-mod call_context;
 
 pub use call_context::CallContext;
 pub use sys::{napi_valuetype, Status};
@@ -47,6 +47,7 @@ pub struct Boolean {
 #[derive(Clone, Copy, Debug)]
 pub enum Number {
   Int(i64),
+  Int32(i32),
   U32(u32),
   Double(f64),
 }
@@ -199,6 +200,14 @@ impl Env {
     Ok(Value::from_raw_value(self, raw_value, Boolean { value }))
   }
 
+  pub fn create_int32<'a>(&'a self, int: i32) -> Result<Value<'a, Number>> {
+    let mut raw_value = ptr::null_mut();
+    let status =
+      unsafe { sys::napi_create_int32(self.0, int, (&mut raw_value) as *mut sys::napi_value) };
+    check_status(status)?;
+    Ok(Value::from_raw_value(self, raw_value, Number::Int32(int)))
+  }
+
   pub fn create_int64<'a>(&'a self, int: i64) -> Result<Value<'a, Number>> {
     let mut raw_value = ptr::null_mut();
     let status =
@@ -829,17 +838,17 @@ impl<'env> Value<'env, String> {
   }
 }
 
-impl<'env> TryInto<Vec<u16>> for Value<'env, String> {
+impl<'env> TryFrom<Value<'env, String>> for Vec<u16> {
   type Error = Error;
 
-  fn try_into(self) -> Result<Vec<u16>> {
+  fn try_from(value: Value<'env, String>) -> Result<Vec<u16>> {
-    let mut result = Vec::with_capacity(self.len()? + 1); // Leave room for trailing null byte
+    let mut result = Vec::with_capacity(value.len()? + 1); // Leave room for trailing null byte
 
     unsafe {
       let mut written_char_count = 0;
       let status = sys::napi_get_value_string_utf16(
-        self.env.0,
+        value.env.0,
-        self.raw_value,
+        value.raw_value,
         result.as_mut_ptr(),
         result.capacity() as u64,
         &mut written_char_count,
@@ -852,34 +861,56 @@ impl<'env> TryInto<Vec<u16>> for Value<'env, String> {
   }
 }
 
-impl<'env> TryInto<usize> for Value<'env, Number> {
+impl<'env> TryFrom<Value<'env, Number>> for usize {
   type Error = Error;
 
-  fn try_into(self) -> Result<usize> {
+  fn try_from(value: Value<'env, Number>) -> Result<usize> {
     let mut result = 0;
-    let status = unsafe { sys::napi_get_value_int64(self.env.0, self.raw_value, &mut result) };
+    let status = unsafe { sys::napi_get_value_int64(value.env.0, value.raw_value, &mut result) };
     check_status(status)?;
     Ok(result as usize)
   }
 }
 
-impl<'env> TryInto<i64> for Value<'env, Number> {
+impl<'env> TryFrom<Value<'env, Number>> for u32 {
   type Error = Error;
 
-  fn try_into(self) -> Result<i64> {
+  fn try_from(value: Value<'env, Number>) -> Result<u32> {
     let mut result = 0;
-    let status = unsafe { sys::napi_get_value_int64(self.env.0, self.raw_value, &mut result) };
+    let status = unsafe { sys::napi_get_value_uint32(value.env.0, value.raw_value, &mut result) };
     check_status(status)?;
     Ok(result)
   }
 }
 
-impl<'env> TryInto<f64> for Value<'env, Number> {
+impl<'env> TryFrom<Value<'env, Number>> for i32 {
   type Error = Error;
 
-  fn try_into(self) -> Result<f64> {
+  fn try_from(value: Value<'env, Number>) -> Result<i32> {
+    let mut result = 0;
+    let status = unsafe { sys::napi_get_value_int32(value.env.0, value.raw_value, &mut result) };
+    check_status(status)?;
+    Ok(result)
+  }
+}
+
+impl<'env> TryFrom<Value<'env, Number>> for i64 {
+  type Error = Error;
+
+  fn try_from(value: Value<'env, Number>) -> Result<i64> {
+    let mut result = 0;
+    let status = unsafe { sys::napi_get_value_int64(value.env.0, value.raw_value, &mut result) };
+    check_status(status)?;
+    Ok(result)
+  }
+}
+
+impl<'env> TryFrom<Value<'env, Number>> for f64 {
+  type Error = Error;
+
+  fn try_from(value: Value<'env, Number>) -> Result<f64> {
     let mut result = 0_f64;
-    let status = unsafe { sys::napi_get_value_double(self.env.0, self.raw_value, &mut result) };
+    let status = unsafe { sys::napi_get_value_double(value.env.0, value.raw_value, &mut result) };
     check_status(status)?;
     Ok(result)
   }