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#[cfg(test)] macro_rules! abort { ($err:expr) => { panic!($err); }; ($fmt:literal $($tts:tt)*) => { panic!("{}", format!($fmt $($tts)*)); }; ($span:expr, $($tts:tt)*) => { { let _ = $span; panic!("{}", format!($($tts)*)); } }; } #[cfg(test)] macro_rules! error { ($err:expr) => { panic!($err); }; ($fmt:literal $($tts:tt)*) => { eprintln!("{}", format!($fmt $($tts)*)); }; ($span:expr, $($tts:tt)*) => { { let _ = $span; eprintln!("{}", format!($($tts)*)); } }; } #[cfg(test)] macro_rules! warning { ($err:expr) => { panic!($err); }; ($fmt:literal $($tts:tt)*) => { eprintln!("{}", format!($fmt $($tts)*)); }; ($span:expr, $($tts:tt)*) => { { let _ = $span; eprintln!("{}", format!($($tts)*)); } }; } #[cfg(not(test))] macro_rules! abort { ($($tokens:tt)*) => { proc_macro_error::abort!($($tokens)*); }; } #[cfg(not(test))] macro_rules! error { ($($tokens:tt)*) => { proc_macro_error::emit_error!($($tokens)*); }; } #[cfg(not(test))] macro_rules! warning { ($($tokens:tt)*) => { proc_macro_error::emit_warning!($($tokens)*); }; } #[cfg(test)] macro_rules! assert_eq_tokens { ($actual:expr, $expected:expr) => { let actual = $actual.to_string(); let expected = $expected.to_string(); difference::assert_diff!(&actual, &expected, " ", 0); }; } mod bind; mod config; mod context; mod derive; mod embed; mod shim; mod utils; use darling::{FromDeriveInput, FromMeta}; use proc_macro::TokenStream as TokenStream1; use proc_macro_error::proc_macro_error; use syn::parse_macro_input; use proc_macro2::{Ident, TokenStream}; use bind::*; use config::*; use context::*; use derive::*; use embed::*; use shim::*; use utils::*; /** An attribute to generate bindings easy This macro allows register Rust constants, functions, data types and modules to use it from JavaScript. *NOTE: To export any nested items it should be public.* # Supported attributes Any attributes which is enclosed by a `#[quickjs(...)]` will be interpreted by this macro to control bindings. ## Macro attributes Attribute | Description --------------------------------- | --------------------------- __`ident = "MyModule"`__ | The name of target unit struct to export __`public`__, __`public = "self/super/crate"`__ | Makes the target unit struct visible __`module`__ | Adds the [`ModuleDef`](rquickjs_core::ModuleDef) impl to use bindings as ES6 module __`object`__ | Adds the [`ObjectDef`](rquickjs_core::ModuleDef) impl for attaching bindings to an object __`init`__, __`init = "js_module_init"`__ | Adds the `js_module_init` function (in particular for creating dynamically loadable modules or static libraries to use from `C`) __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate ## Module attributes Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames module to export __`bare`__ | Exports contents of the module to the parent module instead of creating submodule (this is off by default) __`skip`__ | Skips exporting this module __`hide`__ | Do not output this module (bindings only) ## Constant attributes Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames constant to export __`value`__ | Defines a property __`writable`__ | Makes property to be writable __`configurable`__ | Makes property to be configurable __`enumerable`__ | Makes property to be enumerable __`proto`__ | Sets constant or property to prototype __`skip`__ | Skips exporting this contant __`hide`__ | Do not output this constant (bindings only) ## Function attributes Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames function to export __`get`__ | Uses function as a getter for a property __`set`__ | Uses function as a setter for a property __`configurable`__ | Makes property to be configurable __`enumerable`__ | Makes property to be enumerable __`constructor`__, __`constructor = true`__ | Forces creating contructor __`constructor = false`__ | Disables creating contructor __`skip`__ | Skips exporting this function __`hide`__ | Do not output this function (bindings only) When multiple functions is declared with same name (i.e. same `rename` attribute value) it will be overloaded. The overloading rules is dead simple, so currently you should be care to get it works. Overloading is not supported for property getters/setters. ## Data type attributes This attributes applies to structs and enums to use it as ES6 classes. Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames data type to export __`has_refs`__ | Marks data which has internal refs to other JS values (requires [`HasRefs`](rquickjs_core::HasRefs) to be implemented) __`cloneable`__ | Marks data type which implements `Clone` trait __`skip`__ | Skips exporting this data type __`hide`__ | Do not output this data type (bindings only) The following traits will be implemented for data type: - [`ClassDef`](rquickjs_core::ClassDef) - [`IntoJs`](rquickjs_core::IntoJs) - [`FromJs`](rquickjs_core::FromJs) if `cloneable` attribute is present The following traits will be implemented for references to data type: - [`IntoJs`](rquickjs_core::IntoJs) if `cloneable` attribute is present - [`FromJs`](rquickjs_core::IntoJs) ## Data field attributes This attributes applies to data fields to use it as a properties. Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames field to export __`readonly`__ | Makes this field to be readonly __`skip`__ | Skips exporting this field ## `impl` block attributes This attributes applies to `impl` blocks to bind class methods and properties and also adding static constants and functions. Attribute | Description ------------------------- | --------------------------- __`rename = "new_name"`__ | Renames data type to export __`has_refs`__ | Marks data which has internal refs to other JS values (requires [`HasRefs`](rquickjs_core::HasRefs) to be implemented) __`skip`__ | Skips exporting this impl block __`hide`__ | Do not output this impl block (bindings only) # Examples ### Single function binding ``` use rquickjs::{Runtime, Context, bind}; #[bind(object)] pub fn add2(a: f32, b: f32) -> f32 { a + b } let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); ctx.with(|ctx| { let glob = ctx.globals(); glob.init_def::<Add2>().unwrap(); let res: f32 = ctx.eval(r#"add2(1, 2)"#).unwrap(); assert_eq!(res, 3.0); }); ``` ### Module with two functions ``` use rquickjs::{Runtime, Context, Object, bind}; #[bind(object)] pub mod math { pub const PI: f32 = core::f32::consts::PI; pub fn add2(a: f32, b: f32) -> f32 { a + b } pub fn mul2(a: f32, b: f32) -> f32 { a * b } } let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); ctx.with(|ctx| { let glob = ctx.globals(); glob.init_def::<Math>().unwrap(); let res: f32 = ctx.eval(r#"math.mul2(3, math.add2(1, 2))"#).unwrap(); assert_eq!(res, 9.0); }); ``` ### Module with two functions which reused from another module ``` use rquickjs::{Runtime, Context, Object, bind}; mod my_math { pub const PI: f32 = core::f32::consts::PI; pub fn add2(a: f32, b: f32) -> f32 { a + b } pub fn mul2(a: f32, b: f32) -> f32 { a * b } } #[bind(object)] mod math { pub use super::my_math::*; #[quickjs(hide)] pub const PI: f32 = (); #[quickjs(hide)] pub fn add2(a: f32, b: f32) -> f32 {} #[quickjs(hide)] pub fn mul2(a: f32, b: f32) -> f32 {} } # fn main() { let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); ctx.with(|ctx| { let glob = ctx.globals(); glob.init_def::<Math>().unwrap(); let res: f32 = ctx.eval(r#"math.mul2(3, math.add2(1, 2))"#).unwrap(); assert_eq!(res, 9.0); }); # } ``` ### Bare module definition ``` use rquickjs::{Runtime, Context, Object, bind}; #[bind(object)] #[quickjs(bare)] pub mod math { #[quickjs(name = "pi")] pub const PI: f32 = core::f32::consts::PI; pub fn add2(a: f32, b: f32) -> f32 { a + b } pub fn mul2(a: f32, b: f32) -> f32 { a * b } } let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); ctx.with(|ctx| { let glob = ctx.globals(); glob.init_def::<Math>().unwrap(); let res: f32 = ctx.eval(r#"mul2(3, add2(1, 2))"#).unwrap(); assert_eq!(res, 9.0); }); ``` ### Async function binding ``` # #[async_std::main] # async fn main() { use rquickjs::{Runtime, Context, Promise, bind, AsyncStd}; #[bind(object)] pub async fn sleep(msecs: u64) { async_std::task::sleep( std::time::Duration::from_millis(msecs) ).await; } let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); rt.spawn_executor(AsyncStd); ctx.with(|ctx| { ctx.globals().init_def::<Sleep>().unwrap(); }); let promise: Promise<String> = ctx.with(|ctx| { ctx.eval(r#" async function mysleep() { await sleep(50); return "ok"; } mysleep() "#).unwrap() }); let res = promise.await.unwrap(); assert_eq!(res, "ok"); rt.idle().await; # } ``` ### Class binding ``` use rquickjs::{bind, Runtime, Context, Error}; #[bind(object)] #[quickjs(bare)] mod geom { pub struct Point { // field properties pub x: f64, pub y: f64, } impl Point { // constructor pub fn new(x: f64, y: f64) -> Self { Self { x, y } } // instance method pub fn norm(&self) -> f64 { Self::dot(self, self).sqrt() } // instance property getter #[quickjs(get, enumerable)] pub fn xy(&self) -> (f64, f64) { (self.x, self.y) } // instance property setter #[quickjs(rename = "xy", set)] pub fn set_xy(&mut self, xy: (f64, f64)) { self.x = xy.0; self.y = xy.1; } // static method pub fn dot(a: &Point, b: &Point) -> f64 { a.x * b.x + a.y * b.y } // static property with getter #[quickjs(get)] pub fn zero() -> Self { Point { x: 0.0, y: 0.0 } } } } let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); ctx.with(|ctx| { ctx.globals().init_def::<Geom>().unwrap(); }); ctx.with(|ctx| { ctx.eval::<(), _>(r#" function assert(res) { if (!res) throw new Error("Assertion failed"); } class ColorPoint extends Point { constructor(x, y, color) { super(x, y); this.color = color; } get_color() { return this.color; } } let pt = new Point(2, 3); assert(pt.x === 2); assert(pt.y === 3); pt.x = 4; assert(pt.x === 4); assert(pt.norm() == 5); let xy = pt.xy; assert(xy.length === 2); assert(xy[0] === 4); assert(xy[1] === 3); pt.xy = [3, 4]; assert(pt.x === 3); assert(pt.y === 4); assert(Point.dot(pt, Point(2, 1)) == 10); let ptz = Point.zero; assert(ptz.x === 0); assert(ptz.y === 0); let ptc = new ColorPoint(2, 3, 0xffffff); assert(ptc.x === 2); assert(ptc.color === 0xffffff); assert(ptc.get_color() === 0xffffff); "#).unwrap(); }); ``` */ #[proc_macro_error] #[proc_macro_attribute] pub fn bind(attr: TokenStream1, item: TokenStream1) -> TokenStream1 { let attr: AttributeArgs = parse_macro_input!(attr); let item = parse_macro_input!(item); let attr = AttrItem::from_list(&*attr).unwrap_or_else(|error| { abort!("{}", error); }); let mut binder = Binder::new(attr.config()); let output = binder.expand(attr, item); output.into() } /** An attribute to convert scripts modules into builtins # Supported attributes Attribute | Description -------------------------- | -------------------------- __`ident = "MyModule"`__ | The name of target unit struct to export __`public`__, __`public = "self/super/crate"`__ | Makes the target unit struct visible __`path = "search-path"`__ | Add a paths where modules can be found __`name = "module-name"`__ | The name of module to embed __`perfect`__ | Use perfect hash map for embedded modules (`feature = "phf"`) __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate # Examples ``` # use rquickjs::{embed, Runtime, Context, Module}; #[embed(path = "../examples/module-loader")] mod script_module {} let rt = Runtime::new().unwrap(); let ctx = Context::full(&rt).unwrap(); rt.set_loader(SCRIPT_MODULE, SCRIPT_MODULE); ctx.with(|ctx| { ctx.compile("script", r#" import { n, s, f } from "script_module"; "#).unwrap(); }); ``` */ #[proc_macro_error] #[proc_macro_attribute] pub fn embed(attr: TokenStream1, item: TokenStream1) -> TokenStream1 { let attr: AttributeArgs = parse_macro_input!(attr); let item = parse_macro_input!(item); let attr = AttrEmbed::from_list(&*attr).unwrap_or_else(|error| { abort!("{}", error); }); let embedder = Embedder::new(attr.config()); let output = embedder.expand(attr, item); output.into() } /** A macro to derive [`HasRefs`](rquickjs_core::HasRefs) # Supported attributes ## Macro attributes Attribute | Description ------------------------ | -------------------------- __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate ## Field attributes Attribute | Description ------------------------ | -------------------------- __`has_refs`__ | Mark a field which has referenses # Examples ## Struct ``` # use std::collections::HashMap; # use rquickjs::{HasRefs, Persistent, Function, Array}; #[derive(HasRefs)] struct Data { #[quickjs(has_refs)] lists: HashMap<String, Persistent<Array<'static>>>, #[quickjs(has_refs)] func: Persistent<Function<'static>>, flag: bool, text: String, } ``` ## Enum ``` # use std::collections::HashMap; # use rquickjs::{HasRefs, Persistent, Function, Array}; #[derive(HasRefs)] enum Data { Lists( #[quickjs(has_refs)] HashMap<String, Persistent<Array<'static>>> ), Func { name: String, #[quickjs(has_refs)] func: Persistent<Function<'static>>, }, Flag(bool), Text(String), } ``` */ #[proc_macro_error] #[proc_macro_derive(HasRefs, attributes(quickjs))] pub fn has_refs(input: TokenStream1) -> TokenStream1 { let input = parse_macro_input!(input); let input = DataType::from_derive_input(&input).unwrap_or_else(|error| { abort!(input.ident.span(), "HasRefs deriving error: {}", error); }); let config = input.config(); let binder = HasRefs::new(config); let output = binder.expand(&input); output.into() } /** A macro to derive [`FromJs`](rquickjs_core::FromJs) for an arbitrary structured types # Supported attributes ## Macro attributes Attribute | Description --------------------------------- | --------------------------- __`rename_all = "<rule>"`__ | Renames variants and fields by applying renaming rule ("lowercase", "PascalCase", "camelCase", "snake_case", "SCREAMING_SNAKE_CASE", "kebab-case") __`bound = "T: Bound"`__ | Overrides type paremters bounds __`tag`__, __`tag = "type"`__ | Turns `enum` representation to **internally tagged** __`content`__, __`content = "data"`__ | With `tag` turns `enum` representation to **adjacently tagged** __`untagged`__ | Turns `enum` representation to **untagged** __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate The default `enum` representation is **externally tagged**. ## Variant attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a variant __`skip`__ | Skips this variant If a `enum` representation is `untagged` the variants with `discriminant` will be represented as a numbers. ## Field attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a field __`default`__, __`default = "path"`__ | Sets the default for a field __`skip`__ | Skips this field # Examples ### Unit struct ``` use rquickjs::FromJs; #[derive(FromJs)] struct MyUnit; ``` ### Tuple struct ``` # use rquickjs::FromJs; #[derive(FromJs)] struct MyTuple(i32, String); ``` ### Struct with fields ``` # use rquickjs::FromJs; #[derive(FromJs)] struct MyStruct { int: i32, text: String, #[quickjs(skip)] skipped: bool, } ``` ### Struct with fields with default values ``` # use rquickjs::FromJs; #[derive(FromJs)] struct MyStruct { #[quickjs(default)] int: i32, #[quickjs(default = "default_text")] text: String, } fn default_text() -> String { "hello".into() } ``` ### Externally tagged enum ``` # use rquickjs::FromJs; #[derive(FromJs)] enum Enum { A(f32), B { s: String }, C, } ``` ### Internally tagged enum ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(tag = "tag")] enum Enum { A(f32), B { s: String }, C, } ``` ### Adjacently tagged enum ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(tag = "type", content = "data")] enum Enum { A(f32), B { s: String }, C, } ``` ### Untagged unit enum ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(untagged)] enum MyEnum { A, B, } ``` ### Untagged unit enum with discriminant ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(untagged)] enum MyEnum { A = 1, B = 2, } ``` ### Externally tagged tuple enum ``` # use rquickjs::FromJs; #[derive(FromJs)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Adjacently tagged tuple enum ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(tag, content = "data")] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Untagged tuple enum ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(untagged)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Internally tagged enum with fields ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Internally tagged enum with fields with defaults ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, #[quickjs(default)] y: f64, }, Bar { #[quickjs(default = "default_msg")] msg: String, }, } fn default_msg() -> String { "my message".into() } ``` ### Untagged enum with fields ``` # use rquickjs::FromJs; #[derive(FromJs)] #[quickjs(untagged)] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Generic newtype-like struct ``` # use rquickjs::FromJs; #[derive(FromJs)] struct Newtype<T>(pub T); ``` ### Generic struct with fields ``` # use rquickjs::FromJs; #[derive(FromJs)] struct MyStruct<T> { pub tag: i32, pub value: T, } ``` ### Generic enum ``` # use rquickjs::FromJs; #[derive(FromJs)] enum MyEnum<T> { Foo(T), Bar { value: T, tag: i32 }, } ``` */ #[proc_macro_error] #[proc_macro_derive(FromJs, attributes(quickjs))] pub fn from_js(input: TokenStream1) -> TokenStream1 { let input = parse_macro_input!(input); let input = DataType::from_derive_input(&input).unwrap_or_else(|error| { abort!(input.ident.span(), "FromJs deriving error: {}", error); }); let config = input.config(); let binder = FromJs::new(config); let output = binder.expand(&input); output.into() } /** A macro to derive [`IntoJs`](rquickjs_core::IntoJs) for an arbitrary structured types # Supported attributes ## Macro attributes Attribute | Description --------------------------------- | --------------------------- __`rename_all = "<rule>"`__ | Renames variants and fields by applying renaming rule ("lowercase", "PascalCase", "camelCase", "snake_case", "SCREAMING_SNAKE_CASE", "kebab-case") __`bound = "T: Bound"`__ | Overrides type paremters bounds __`tag`__, __`tag = "type"`__ | Turns `enum` representation to **internally tagged** __`content`__, __`content = "data"`__ | With `tag` turns `enum` representation to **adjacently tagged** __`untagged`__ | Turns `enum` representation to **untagged** __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate The default `enum` representation is **externally tagged**. ## Variant attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a variant __`skip`__ | Skips this variant If a `enum` representation is `untagged` the variants with `discriminant` will be represented as a numbers. ## Field attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a field __`default`__, __`default = "path"`__ | Sets the default for a field __`skip_default`__ | Skip named field when default value is set __`skip`__ | Skips this field # Examples ### Unit struct ``` use rquickjs::IntoJs; #[derive(IntoJs)] struct MyUnit; ``` ### Tuple struct ``` # use rquickjs::IntoJs; #[derive(IntoJs)] struct MyTuple(i32, String); ``` ### Struct with fields ``` # use rquickjs::IntoJs; #[derive(IntoJs)] struct MyStruct { int: i32, text: String, } ``` ### Struct with fields with default values ``` # use rquickjs::IntoJs; #[derive(IntoJs)] struct MyStruct { #[quickjs(skip_default)] int: i32, #[quickjs(default = "default_text", skip_default)] text: String, } fn default_text() -> String { "hello".into() } ``` ### Untagged unit enum ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(untagged)] enum MyEnum { Foo, Bar, } ``` ### Untagged unit enum with discriminant ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(untagged)] #[repr(i32)] enum MyEnum { Foo = 1, Bar = 2, } ``` ### Externally tagged tuple enum ``` # use rquickjs::IntoJs; #[derive(IntoJs)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Adjacently tagged tuple enum ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(tag, content = "data")] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Untagged tuple enum ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(untagged)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Internally tagged enum with fields ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Internally tagged enum with fields with defaults ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, #[quickjs(skip_default)] y: f64, }, Bar { #[quickjs(default = "default_msg", skip_default)] msg: String, }, } fn default_msg() -> String { "my message".into() } ``` ### Untagged enum with fields ``` # use rquickjs::IntoJs; #[derive(IntoJs)] #[quickjs(untagged)] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Generic newtype-like struct ``` # use rquickjs::IntoJs; #[derive(IntoJs)] struct Newtype<T>(pub T); ``` ### Generic struct with fields ``` # use rquickjs::IntoJs; #[derive(IntoJs)] struct MyStruct<T, V> { pub tag: T, pub value: V, } ``` ### Generic enum ``` # use rquickjs::IntoJs; #[derive(IntoJs)] enum MyEnum<T, V> { Foo(V), Bar { value: V, tag: T }, } */ #[proc_macro_error] #[proc_macro_derive(IntoJs, attributes(quickjs))] pub fn into_js(input: TokenStream1) -> TokenStream1 { let input = parse_macro_input!(input); let input = DataType::from_derive_input(&input).unwrap_or_else(|error| { abort!(input.ident.span(), "IntoJs deriving error: {}", error); }); let config = input.config(); let binder = IntoJs::new(config); let output = binder.expand(&input, false); output.into() } /** A macro to derive [`IntoJs`](rquickjs_core::IntoJs) for an arbitrary structured types when it used by reference # Supported attributes ## Macro attributes Attribute | Description --------------------------------- | --------------------------- __`rename_all = "<rule>"`__ | Renames variants and fields by applying renaming rule ("lowercase", "PascalCase", "camelCase", "snake_case", "SCREAMING_SNAKE_CASE", "kebab-case") __`bound = "for<'a> &'a T: Bound"`__ | Overrides type paremters bounds __`tag`__, __`tag = "type"`__ | Turns `enum` representation to **internally tagged** __`content`__, __`content = "data"`__ | With `tag` turns `enum` representation to **adjacently tagged** __`untagged`__ | Turns `enum` representation to **untagged** __`crate = "rquickjs"`__ | Allows rename `rquickjs` crate The default `enum` representation is **externally tagged**. ## Variant attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a variant __`skip`__ | Skips this variant If a `enum` representation is `untagged` the variants with `discriminant` will be represented as a numbers. ## Field attributes Attribute | Description --------------------------------- | --------------------------- __`rename = "new_name"`__ | Renames a field __`default`__, __`default = "path"`__ | Sets the default for a field __`skip_default`__ | Skip named field when default value is set __`skip`__ | Skips this field # Examples ### Unit struct ``` use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct MyUnit; ``` ### Tuple struct ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct MyTuple(i32, String); ``` ### Struct with fields ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct MyStruct { int: i32, text: String, } ``` ### Struct with fields with default values ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct MyStruct { #[quickjs(skip_default)] int: i32, #[quickjs(default = "default_text", skip_default)] text: String, } fn default_text() -> String { "hello".into() } ``` ### Untagged unit enum ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(untagged)] enum MyEnum { Foo, Bar, } ``` ### Untagged unit enum with discriminant ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(untagged)] #[repr(i32)] enum MyEnum { Foo = 1, Bar = 2, } ``` ### Externally tagged tuple enum ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Adjacently tagged tuple enum ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(tag, content = "data")] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Untagged tuple enum ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(untagged)] enum MyEnum { Foo(f64, f64), Bar(String), } ``` ### Internally tagged enum with fields ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Internally tagged enum with fields with defaults ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(tag = "$")] enum MyEnum { Foo { x: f64, #[quickjs(skip_default)] y: f64, }, Bar { #[quickjs(default = "default_msg", skip_default)] msg: String, }, } fn default_msg() -> String { "my message".into() } ``` ### Untagged enum with fields ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] #[quickjs(untagged)] enum MyEnum { Foo { x: f64, y: f64 }, Bar { msg: String }, } ``` ### Generic newtype-like struct ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct Newtype<T>(pub T); ``` ### Generic struct with fields ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] struct MyStruct<T, V> { pub tag: T, pub value: V, } ``` ### Generic enum ``` # use rquickjs::IntoJsByRef; #[derive(IntoJsByRef)] enum MyEnum<T, V> { Foo(V), Bar { value: V, tag: T }, } */ #[proc_macro_error] #[proc_macro_derive(IntoJsByRef, attributes(quickjs))] pub fn into_js_by_ref(input: TokenStream1) -> TokenStream1 { let input = parse_macro_input!(input); let input = DataType::from_derive_input(&input).unwrap_or_else(|error| { abort!(input.ident.span(), "IntoJs deriving error: {}", error); }); let config = input.config(); let binder = IntoJs::new(config); let output = binder.expand(&input, true); output.into() }