wasm-bindgen-macro-support-0.2.78/Cargo.toml0000644000000024230000000000100143150ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g., crates.io) dependencies. # # If you are reading this file be aware that the original Cargo.toml # will likely look very different (and much more reasonable). # See Cargo.toml.orig for the original contents. [package] edition = "2018" name = "wasm-bindgen-macro-support" version = "0.2.78" authors = ["The wasm-bindgen Developers"] description = "The part of the implementation of the `#[wasm_bindgen]` attribute that is not in the shared backend crate\n" homepage = "https://rustwasm.github.io/wasm-bindgen/" documentation = "https://docs.rs/wasm-bindgen" license = "MIT/Apache-2.0" repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/macro-support" [dependencies.proc-macro2] version = "1.0" [dependencies.quote] version = "1.0" [dependencies.syn] version = "1.0.67" features = ["visit", "full"] [dependencies.wasm-bindgen-backend] version = "=0.2.78" [dependencies.wasm-bindgen-shared] version = "=0.2.78" [features] extra-traits = ["syn/extra-traits"] spans = ["wasm-bindgen-backend/spans"] strict-macro = [] wasm-bindgen-macro-support-0.2.78/Cargo.toml.orig000064400000000000000000000014610072674642500200270ustar 00000000000000[package] name = "wasm-bindgen-macro-support" version = "0.2.78" authors = ["The wasm-bindgen Developers"] license = "MIT/Apache-2.0" repository = "https://github.com/rustwasm/wasm-bindgen/tree/master/crates/macro-support" homepage = "https://rustwasm.github.io/wasm-bindgen/" documentation = "https://docs.rs/wasm-bindgen" description = """ The part of the implementation of the `#[wasm_bindgen]` attribute that is not in the shared backend crate """ edition = '2018' [features] spans = ["wasm-bindgen-backend/spans"] extra-traits = ["syn/extra-traits"] strict-macro = [] [dependencies] syn = { version = '1.0.67', features = ['visit', 'full'] } quote = '1.0' proc-macro2 = "1.0" wasm-bindgen-backend = { path = "../backend", version = "=0.2.78" } wasm-bindgen-shared = { path = "../shared", version = "=0.2.78" } wasm-bindgen-macro-support-0.2.78/LICENSE-APACHE000064400000000000000000000251370072674642500170720ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. wasm-bindgen-macro-support-0.2.78/LICENSE-MIT000064400000000000000000000020410072674642500165670ustar 00000000000000Copyright (c) 2014 Alex Crichton Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. wasm-bindgen-macro-support-0.2.78/src/lib.rs000064400000000000000000000072100072674642500170410ustar 00000000000000//! This crate contains the part of the implementation of the `#[wasm_bindgen]` optsibute that is //! not in the shared backend crate. #![doc(html_root_url = "https://docs.rs/wasm-bindgen-macro-support/0.2")] extern crate proc_macro2; extern crate quote; #[macro_use] extern crate syn; #[macro_use] extern crate wasm_bindgen_backend as backend; extern crate wasm_bindgen_shared as shared; pub use crate::parser::BindgenAttrs; use crate::parser::MacroParse; use backend::{Diagnostic, TryToTokens}; use proc_macro2::TokenStream; use quote::ToTokens; use quote::TokenStreamExt; use syn::parse::{Parse, ParseStream, Result as SynResult}; mod parser; /// Takes the parsed input from a `#[wasm_bindgen]` macro and returns the generated bindings pub fn expand(attr: TokenStream, input: TokenStream) -> Result { parser::reset_attrs_used(); let item = syn::parse2::(input)?; let opts = syn::parse2(attr)?; let mut tokens = proc_macro2::TokenStream::new(); let mut program = backend::ast::Program::default(); item.macro_parse(&mut program, (Some(opts), &mut tokens))?; program.try_to_tokens(&mut tokens)?; // If we successfully got here then we should have used up all attributes // and considered all of them to see if they were used. If one was forgotten // that's a bug on our end, so sanity check here. parser::assert_all_attrs_checked(); Ok(tokens) } /// Takes the parsed input from a `#[wasm_bindgen]` macro and returns the generated bindings pub fn expand_class_marker( attr: TokenStream, input: TokenStream, ) -> Result { parser::reset_attrs_used(); let mut item = syn::parse2::(input)?; let opts: ClassMarker = syn::parse2(attr)?; let mut program = backend::ast::Program::default(); item.macro_parse(&mut program, (&opts.class, &opts.js_class))?; parser::assert_all_attrs_checked(); // same as above // This is where things are slightly different, we are being expanded in the // context of an impl so we can't inject arbitrary item-like tokens into the // output stream. If we were to do that then it wouldn't parse! // // Instead what we want to do is to generate the tokens for `program` into // the header of the function. This'll inject some no_mangle functions and // statics and such, and they should all be valid in the context of the // start of a function. // // We manually implement `ToTokens for ImplItemMethod` here, injecting our // program's tokens before the actual method's inner body tokens. let mut tokens = proc_macro2::TokenStream::new(); tokens.append_all(item.attrs.iter().filter(|attr| match attr.style { syn::AttrStyle::Outer => true, _ => false, })); item.vis.to_tokens(&mut tokens); item.sig.to_tokens(&mut tokens); let mut err = None; item.block.brace_token.surround(&mut tokens, |tokens| { if let Err(e) = program.try_to_tokens(tokens) { err = Some(e); } tokens.append_all(item.attrs.iter().filter(|attr| match attr.style { syn::AttrStyle::Inner(_) => true, _ => false, })); tokens.append_all(&item.block.stmts); }); if let Some(err) = err { return Err(err); } Ok(tokens) } struct ClassMarker { class: syn::Ident, js_class: String, } impl Parse for ClassMarker { fn parse(input: ParseStream) -> SynResult { let class = input.parse::()?; input.parse::()?; let js_class = input.parse::()?.value(); Ok(ClassMarker { class, js_class }) } } wasm-bindgen-macro-support-0.2.78/src/parser.rs000064400000000000000000001503670072674642500176030ustar 00000000000000use std::cell::Cell; use std::char; use std::str::Chars; use ast::OperationKind; use backend::ast; use backend::util::{ident_ty, ShortHash}; use backend::Diagnostic; use proc_macro2::{Delimiter, Ident, Span, TokenStream, TokenTree}; use quote::ToTokens; use shared; use syn; use syn::parse::{Parse, ParseStream, Result as SynResult}; use syn::spanned::Spanned; thread_local!(static ATTRS: AttributeParseState = Default::default()); #[derive(Default)] struct AttributeParseState { parsed: Cell, checks: Cell, } /// Parsed attributes from a `#[wasm_bindgen(..)]`. #[cfg_attr(feature = "extra-traits", derive(Debug))] pub struct BindgenAttrs { /// List of parsed attributes pub attrs: Vec<(Cell, BindgenAttr)>, } macro_rules! attrgen { ($mac:ident) => { $mac! { (catch, Catch(Span)), (constructor, Constructor(Span)), (method, Method(Span)), (static_method_of, StaticMethodOf(Span, Ident)), (js_namespace, JsNamespace(Span, Vec, Vec)), (module, Module(Span, String, Span)), (raw_module, RawModule(Span, String, Span)), (inline_js, InlineJs(Span, String, Span)), (getter, Getter(Span, Option)), (setter, Setter(Span, Option)), (indexing_getter, IndexingGetter(Span)), (indexing_setter, IndexingSetter(Span)), (indexing_deleter, IndexingDeleter(Span)), (structural, Structural(Span)), (r#final, Final(Span)), (readonly, Readonly(Span)), (js_name, JsName(Span, String, Span)), (js_class, JsClass(Span, String, Span)), (inspectable, Inspectable(Span)), (is_type_of, IsTypeOf(Span, syn::Expr)), (extends, Extends(Span, syn::Path)), (no_deref, NoDeref(Span)), (vendor_prefix, VendorPrefix(Span, Ident)), (variadic, Variadic(Span)), (typescript_custom_section, TypescriptCustomSection(Span)), (skip_typescript, SkipTypescript(Span)), (start, Start(Span)), (skip, Skip(Span)), (typescript_type, TypeScriptType(Span, String, Span)), (getter_with_clone, GetterWithClone(Span)), // For testing purposes only. (assert_no_shim, AssertNoShim(Span)), } }; } macro_rules! methods { ($(($name:ident, $variant:ident($($contents:tt)*)),)*) => { $(methods!(@method $name, $variant($($contents)*));)* #[cfg(feature = "strict-macro")] fn check_used(self) -> Result<(), Diagnostic> { // Account for the fact this method was called ATTRS.with(|state| state.checks.set(state.checks.get() + 1)); let mut errors = Vec::new(); for (used, attr) in self.attrs.iter() { if used.get() { continue } // The check below causes rustc to crash on powerpc64 platforms // with an LLVM error. To avoid this, we instead use #[cfg()] // and duplicate the function below. See #58516 for details. /*if !cfg!(feature = "strict-macro") { continue }*/ let span = match attr { $(BindgenAttr::$variant(span, ..) => span,)* }; errors.push(Diagnostic::span_error(*span, "unused #[wasm_bindgen] attribute")); } Diagnostic::from_vec(errors) } #[cfg(not(feature = "strict-macro"))] fn check_used(self) -> Result<(), Diagnostic> { // Account for the fact this method was called ATTRS.with(|state| state.checks.set(state.checks.get() + 1)); Ok(()) } }; (@method $name:ident, $variant:ident(Span, String, Span)) => { fn $name(&self) -> Option<(&str, Span)> { self.attrs .iter() .filter_map(|a| match &a.1 { BindgenAttr::$variant(_, s, span) => { a.0.set(true); Some((&s[..], *span)) } _ => None, }) .next() } }; (@method $name:ident, $variant:ident(Span, Vec, Vec)) => { fn $name(&self) -> Option<(&[String], &[Span])> { self.attrs .iter() .filter_map(|a| match &a.1 { BindgenAttr::$variant(_, ss, spans) => { a.0.set(true); Some((&ss[..], &spans[..])) } _ => None, }) .next() } }; (@method $name:ident, $variant:ident(Span, $($other:tt)*)) => { #[allow(unused)] fn $name(&self) -> Option<&$($other)*> { self.attrs .iter() .filter_map(|a| match &a.1 { BindgenAttr::$variant(_, s) => { a.0.set(true); Some(s) } _ => None, }) .next() } }; (@method $name:ident, $variant:ident($($other:tt)*)) => { #[allow(unused)] fn $name(&self) -> Option<&$($other)*> { self.attrs .iter() .filter_map(|a| match &a.1 { BindgenAttr::$variant(s) => { a.0.set(true); Some(s) } _ => None, }) .next() } }; } impl BindgenAttrs { /// Find and parse the wasm_bindgen attributes. fn find(attrs: &mut Vec) -> Result { let mut ret = BindgenAttrs::default(); loop { let pos = attrs .iter() .enumerate() .find(|&(_, ref m)| m.path.segments[0].ident == "wasm_bindgen") .map(|a| a.0); let pos = match pos { Some(i) => i, None => return Ok(ret), }; let attr = attrs.remove(pos); let mut tts = attr.tokens.clone().into_iter(); let group = match tts.next() { Some(TokenTree::Group(d)) => d, Some(_) => bail_span!(attr, "malformed #[wasm_bindgen] attribute"), None => continue, }; if tts.next().is_some() { bail_span!(attr, "malformed #[wasm_bindgen] attribute"); } if group.delimiter() != Delimiter::Parenthesis { bail_span!(attr, "malformed #[wasm_bindgen] attribute"); } let mut attrs: BindgenAttrs = syn::parse2(group.stream())?; ret.attrs.extend(attrs.attrs.drain(..)); attrs.check_used()?; } } attrgen!(methods); } impl Default for BindgenAttrs { fn default() -> BindgenAttrs { // Add 1 to the list of parsed attribute sets. We'll use this counter to // sanity check that we call `check_used` an appropriate number of // times. ATTRS.with(|state| state.parsed.set(state.parsed.get() + 1)); BindgenAttrs { attrs: Vec::new() } } } impl Parse for BindgenAttrs { fn parse(input: ParseStream) -> SynResult { let mut attrs = BindgenAttrs::default(); if input.is_empty() { return Ok(attrs); } let opts = syn::punctuated::Punctuated::<_, syn::token::Comma>::parse_terminated(input)?; attrs.attrs = opts.into_iter().map(|c| (Cell::new(false), c)).collect(); Ok(attrs) } } macro_rules! gen_bindgen_attr { ($(($method:ident, $($variants:tt)*),)*) => { /// The possible attributes in the `#[wasm_bindgen]`. #[cfg_attr(feature = "extra-traits", derive(Debug))] pub enum BindgenAttr { $($($variants)*,)* } } } attrgen!(gen_bindgen_attr); impl Parse for BindgenAttr { fn parse(input: ParseStream) -> SynResult { let original = input.fork(); let attr: AnyIdent = input.parse()?; let attr = attr.0; let attr_span = attr.span(); let attr_string = attr.to_string(); let raw_attr_string = format!("r#{}", attr_string); macro_rules! parsers { ($(($name:ident, $($contents:tt)*),)*) => { $( if attr_string == stringify!($name) || raw_attr_string == stringify!($name) { parsers!( @parser $($contents)* ); } )* }; (@parser $variant:ident(Span)) => ({ return Ok(BindgenAttr::$variant(attr_span)); }); (@parser $variant:ident(Span, Ident)) => ({ input.parse::()?; let ident = input.parse::()?.0; return Ok(BindgenAttr::$variant(attr_span, ident)) }); (@parser $variant:ident(Span, Option)) => ({ if input.parse::().is_ok() { let ident = input.parse::()?.0; return Ok(BindgenAttr::$variant(attr_span, Some(ident))) } else { return Ok(BindgenAttr::$variant(attr_span, None)); } }); (@parser $variant:ident(Span, syn::Path)) => ({ input.parse::()?; return Ok(BindgenAttr::$variant(attr_span, input.parse()?)); }); (@parser $variant:ident(Span, syn::Expr)) => ({ input.parse::()?; return Ok(BindgenAttr::$variant(attr_span, input.parse()?)); }); (@parser $variant:ident(Span, String, Span)) => ({ input.parse::()?; let (val, span) = match input.parse::() { Ok(str) => (str.value(), str.span()), Err(_) => { let ident = input.parse::()?.0; (ident.to_string(), ident.span()) } }; return Ok(BindgenAttr::$variant(attr_span, val, span)) }); (@parser $variant:ident(Span, Vec, Vec)) => ({ input.parse::()?; let (vals, spans) = match input.parse::() { Ok(exprs) => { let mut vals = vec![]; let mut spans = vec![]; for expr in exprs.elems.iter() { if let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Str(ref str), .. }) = expr { vals.push(str.value()); spans.push(str.span()); } else { return Err(syn::Error::new(expr.span(), "expected string literals")); } } (vals, spans) }, Err(_) => { let ident = input.parse::()?.0; (vec![ident.to_string()], vec![ident.span()]) } }; return Ok(BindgenAttr::$variant(attr_span, vals, spans)) }); } attrgen!(parsers); return Err(original.error("unknown attribute")); } } struct AnyIdent(Ident); impl Parse for AnyIdent { fn parse(input: ParseStream) -> SynResult { input.step(|cursor| match cursor.ident() { Some((ident, remaining)) => Ok((AnyIdent(ident), remaining)), None => Err(cursor.error("expected an identifier")), }) } } /// Conversion trait with context. /// /// Used to convert syn tokens into an AST, that we can then use to generate glue code. The context /// (`Ctx`) is used to pass in the attributes from the `#[wasm_bindgen]`, if needed. trait ConvertToAst { /// What we are converting to. type Target; /// Convert into our target. /// /// Since this is used in a procedural macro, use panic to fail. fn convert(self, context: Ctx) -> Result; } impl<'a> ConvertToAst for &'a mut syn::ItemStruct { type Target = ast::Struct; fn convert(self, attrs: BindgenAttrs) -> Result { if self.generics.params.len() > 0 { bail_span!( self.generics, "structs with #[wasm_bindgen] cannot have lifetime or \ type parameters currently" ); } let mut fields = Vec::new(); let js_name = attrs .js_name() .map(|s| s.0.to_string()) .unwrap_or(self.ident.to_string()); let is_inspectable = attrs.inspectable().is_some(); let getter_with_clone = attrs.getter_with_clone().is_some(); for (i, field) in self.fields.iter_mut().enumerate() { match field.vis { syn::Visibility::Public(..) => {} _ => continue, } let (js_field_name, member) = match &field.ident { Some(ident) => (ident.to_string(), syn::Member::Named(ident.clone())), None => (i.to_string(), syn::Member::Unnamed(i.into())), }; let attrs = BindgenAttrs::find(&mut field.attrs)?; assert_not_variadic(&attrs)?; if attrs.skip().is_some() { attrs.check_used()?; continue; } let js_field_name = match attrs.js_name() { Some((name, _)) => name.to_string(), None => js_field_name, }; let comments = extract_doc_comments(&field.attrs); let getter = shared::struct_field_get(&js_name, &js_field_name); let setter = shared::struct_field_set(&js_name, &js_field_name); fields.push(ast::StructField { rust_name: member, js_name: js_field_name, struct_name: self.ident.clone(), readonly: attrs.readonly().is_some(), ty: field.ty.clone(), getter: Ident::new(&getter, Span::call_site()), setter: Ident::new(&setter, Span::call_site()), comments, generate_typescript: attrs.skip_typescript().is_none(), getter_with_clone: getter_with_clone || attrs.getter_with_clone().is_some(), }); attrs.check_used()?; } let generate_typescript = attrs.skip_typescript().is_none(); let comments: Vec = extract_doc_comments(&self.attrs); attrs.check_used()?; Ok(ast::Struct { rust_name: self.ident.clone(), js_name, fields, comments, is_inspectable, generate_typescript, }) } } fn get_ty(mut ty: &syn::Type) -> &syn::Type { while let syn::Type::Group(g) = ty { ty = &g.elem; } ty } fn get_expr(mut expr: &syn::Expr) -> &syn::Expr { while let syn::Expr::Group(g) = expr { expr = &g.expr; } expr } impl<'a> ConvertToAst<(BindgenAttrs, &'a ast::ImportModule)> for syn::ForeignItemFn { type Target = ast::ImportKind; fn convert( self, (opts, module): (BindgenAttrs, &'a ast::ImportModule), ) -> Result { let wasm = function_from_decl( &self.sig.ident, &opts, self.sig.clone(), self.attrs.clone(), self.vis.clone(), false, None, )? .0; let catch = opts.catch().is_some(); let variadic = opts.variadic().is_some(); let js_ret = if catch { // TODO: this assumes a whole bunch: // // * The outer type is actually a `Result` // * The error type is a `JsValue` // * The actual type is the first type parameter // // should probably fix this one day... extract_first_ty_param(wasm.ret.as_ref())? } else { wasm.ret.clone() }; let operation_kind = operation_kind(&opts); let kind = if opts.method().is_some() { let class = wasm.arguments.get(0).ok_or_else(|| { err_span!(self, "imported methods must have at least one argument") })?; let class = match get_ty(&class.ty) { syn::Type::Reference(syn::TypeReference { mutability: None, elem, .. }) => &**elem, _ => bail_span!( class.ty, "first argument of method must be a shared reference" ), }; let class_name = match get_ty(class) { syn::Type::Path(syn::TypePath { qself: None, ref path, }) => path, _ => bail_span!(class, "first argument of method must be a path"), }; let class_name = extract_path_ident(class_name)?; let class_name = opts .js_class() .map(|p| p.0.into()) .unwrap_or_else(|| class_name.to_string()); let kind = ast::MethodKind::Operation(ast::Operation { is_static: false, kind: operation_kind, }); ast::ImportFunctionKind::Method { class: class_name, ty: class.clone(), kind, } } else if let Some(cls) = opts.static_method_of() { let class = opts .js_class() .map(|p| p.0.into()) .unwrap_or_else(|| cls.to_string()); let ty = ident_ty(cls.clone()); let kind = ast::MethodKind::Operation(ast::Operation { is_static: true, kind: operation_kind, }); ast::ImportFunctionKind::Method { class, ty, kind } } else if opts.constructor().is_some() { let class = match js_ret { Some(ref ty) => ty, _ => bail_span!(self, "constructor returns must be bare types"), }; let class_name = match get_ty(class) { syn::Type::Path(syn::TypePath { qself: None, ref path, }) => path, _ => bail_span!(self, "return value of constructor must be a bare path"), }; let class_name = extract_path_ident(class_name)?; let class_name = opts .js_class() .map(|p| p.0.into()) .unwrap_or_else(|| class_name.to_string()); ast::ImportFunctionKind::Method { class: class_name.to_string(), ty: class.clone(), kind: ast::MethodKind::Constructor, } } else { ast::ImportFunctionKind::Normal }; let shim = { let ns = match kind { ast::ImportFunctionKind::Normal => (0, "n"), ast::ImportFunctionKind::Method { ref class, .. } => (1, &class[..]), }; let data = (ns, &self.sig.ident, module); format!( "__wbg_{}_{}", wasm.name .chars() .filter(|c| c.is_ascii_alphanumeric()) .collect::(), ShortHash(data) ) }; if let Some(span) = opts.r#final() { if opts.structural().is_some() { let msg = "cannot specify both `structural` and `final`"; return Err(Diagnostic::span_error(*span, msg)); } } let assert_no_shim = opts.assert_no_shim().is_some(); let ret = ast::ImportKind::Function(ast::ImportFunction { function: wasm, assert_no_shim, kind, js_ret, catch, variadic, structural: opts.structural().is_some() || opts.r#final().is_none(), rust_name: self.sig.ident.clone(), shim: Ident::new(&shim, Span::call_site()), doc_comment: None, }); opts.check_used()?; Ok(ret) } } impl ConvertToAst for syn::ForeignItemType { type Target = ast::ImportKind; fn convert(self, attrs: BindgenAttrs) -> Result { assert_not_variadic(&attrs)?; let js_name = attrs .js_name() .map(|s| s.0) .map_or_else(|| self.ident.to_string(), |s| s.to_string()); let typescript_type = attrs.typescript_type().map(|s| s.0.to_string()); let is_type_of = attrs.is_type_of().cloned(); let shim = format!("__wbg_instanceof_{}_{}", self.ident, ShortHash(&self.ident)); let mut extends = Vec::new(); let mut vendor_prefixes = Vec::new(); let no_deref = attrs.no_deref().is_some(); for (used, attr) in attrs.attrs.iter() { match attr { BindgenAttr::Extends(_, e) => { extends.push(e.clone()); used.set(true); } BindgenAttr::VendorPrefix(_, e) => { vendor_prefixes.push(e.clone()); used.set(true); } _ => {} } } attrs.check_used()?; Ok(ast::ImportKind::Type(ast::ImportType { vis: self.vis, attrs: self.attrs, doc_comment: None, instanceof_shim: shim, is_type_of, rust_name: self.ident, typescript_type, js_name, extends, vendor_prefixes, no_deref, })) } } impl<'a> ConvertToAst<(BindgenAttrs, &'a ast::ImportModule)> for syn::ForeignItemStatic { type Target = ast::ImportKind; fn convert( self, (opts, module): (BindgenAttrs, &'a ast::ImportModule), ) -> Result { if self.mutability.is_some() { bail_span!(self.mutability, "cannot import mutable globals yet") } assert_not_variadic(&opts)?; let default_name = self.ident.to_string(); let js_name = opts .js_name() .map(|p| p.0) .unwrap_or(&default_name) .to_string(); let shim = format!( "__wbg_static_accessor_{}_{}", self.ident, ShortHash((&js_name, module, &self.ident)), ); opts.check_used()?; Ok(ast::ImportKind::Static(ast::ImportStatic { ty: *self.ty, vis: self.vis, rust_name: self.ident.clone(), js_name, shim: Ident::new(&shim, Span::call_site()), })) } } impl ConvertToAst for syn::ItemFn { type Target = ast::Function; fn convert(self, attrs: BindgenAttrs) -> Result { match self.vis { syn::Visibility::Public(_) => {} _ => bail_span!(self, "can only #[wasm_bindgen] public functions"), } if self.sig.constness.is_some() { bail_span!( self.sig.constness, "can only #[wasm_bindgen] non-const functions" ); } if self.sig.unsafety.is_some() { bail_span!(self.sig.unsafety, "can only #[wasm_bindgen] safe functions"); } assert_not_variadic(&attrs)?; let ret = function_from_decl( &self.sig.ident, &attrs, self.sig.clone(), self.attrs, self.vis, false, None, )?; attrs.check_used()?; Ok(ret.0) } } /// Construct a function (and gets the self type if appropriate) for our AST from a syn function. fn function_from_decl( decl_name: &syn::Ident, opts: &BindgenAttrs, sig: syn::Signature, attrs: Vec, vis: syn::Visibility, allow_self: bool, self_ty: Option<&Ident>, ) -> Result<(ast::Function, Option), Diagnostic> { if sig.variadic.is_some() { bail_span!(sig.variadic, "can't #[wasm_bindgen] variadic functions"); } if sig.generics.params.len() > 0 { bail_span!( sig.generics, "can't #[wasm_bindgen] functions with lifetime or type parameters", ); } assert_no_lifetimes(&sig)?; let syn::Signature { inputs, output, .. } = sig; let replace_self = |t: syn::Type| { let self_ty = match self_ty { Some(i) => i, None => return t, }; let path = match get_ty(&t) { syn::Type::Path(syn::TypePath { qself: None, path }) => path.clone(), other => return other.clone(), }; let new_path = if path.segments.len() == 1 && path.segments[0].ident == "Self" { self_ty.clone().into() } else { path }; syn::Type::Path(syn::TypePath { qself: None, path: new_path, }) }; let mut method_self = None; let arguments = inputs .into_iter() .filter_map(|arg| match arg { syn::FnArg::Typed(mut c) => { c.ty = Box::new(replace_self(*c.ty)); Some(c) } syn::FnArg::Receiver(r) => { if !allow_self { panic!("arguments cannot be `self`") } assert!(method_self.is_none()); if r.reference.is_none() { method_self = Some(ast::MethodSelf::ByValue); } else if r.mutability.is_some() { method_self = Some(ast::MethodSelf::RefMutable); } else { method_self = Some(ast::MethodSelf::RefShared); } None } }) .collect::>(); let ret = match output { syn::ReturnType::Default => None, syn::ReturnType::Type(_, ty) => Some(replace_self(*ty)), }; let (name, name_span, renamed_via_js_name) = if let Some((js_name, js_name_span)) = opts.js_name() { let kind = operation_kind(&opts); let prefix = match kind { OperationKind::Setter(_) => "set_", _ => "", }; ( format!("{}{}", prefix, js_name.to_string()), js_name_span, true, ) } else { (decl_name.to_string(), decl_name.span(), false) }; Ok(( ast::Function { arguments, name_span, name, renamed_via_js_name, ret, rust_attrs: attrs, rust_vis: vis, r#async: sig.asyncness.is_some(), generate_typescript: opts.skip_typescript().is_none(), }, method_self, )) } pub(crate) trait MacroParse { /// Parse the contents of an object into our AST, with a context if necessary. /// /// The context is used to have access to the attributes on `#[wasm_bindgen]`, and to allow /// writing to the output `TokenStream`. fn macro_parse(self, program: &mut ast::Program, context: Ctx) -> Result<(), Diagnostic>; } impl<'a> MacroParse<(Option, &'a mut TokenStream)> for syn::Item { fn macro_parse( self, program: &mut ast::Program, (opts, tokens): (Option, &'a mut TokenStream), ) -> Result<(), Diagnostic> { match self { syn::Item::Fn(mut f) => { let no_mangle = f .attrs .iter() .enumerate() .filter_map(|(i, m)| m.parse_meta().ok().map(|m| (i, m))) .find(|(_, m)| m.path().is_ident("no_mangle")); match no_mangle { Some((i, _)) => { f.attrs.remove(i); } _ => {} } let comments = extract_doc_comments(&f.attrs); f.to_tokens(tokens); let opts = opts.unwrap_or_default(); if opts.start().is_some() { if f.sig.generics.params.len() > 0 { bail_span!(&f.sig.generics, "the start function cannot have generics",); } if f.sig.inputs.len() > 0 { bail_span!(&f.sig.inputs, "the start function cannot have arguments",); } } let method_kind = ast::MethodKind::Operation(ast::Operation { is_static: true, kind: operation_kind(&opts), }); let rust_name = f.sig.ident.clone(); let start = opts.start().is_some(); program.exports.push(ast::Export { comments, function: f.convert(opts)?, js_class: None, method_kind, method_self: None, rust_class: None, rust_name, start, }); } syn::Item::Struct(mut s) => { let opts = opts.unwrap_or_default(); program.structs.push((&mut s).convert(opts)?); s.to_tokens(tokens); } syn::Item::Impl(mut i) => { let opts = opts.unwrap_or_default(); (&mut i).macro_parse(program, opts)?; i.to_tokens(tokens); } syn::Item::ForeignMod(mut f) => { let opts = match opts { Some(opts) => opts, None => BindgenAttrs::find(&mut f.attrs)?, }; f.macro_parse(program, opts)?; } syn::Item::Enum(mut e) => { let opts = match opts { Some(opts) => opts, None => BindgenAttrs::find(&mut e.attrs)?, }; e.macro_parse(program, (tokens, opts))?; } syn::Item::Const(mut c) => { let opts = match opts { Some(opts) => opts, None => BindgenAttrs::find(&mut c.attrs)?, }; c.macro_parse(program, opts)?; } _ => { bail_span!( self, "#[wasm_bindgen] can only be applied to a function, \ struct, enum, impl, or extern block", ); } } Ok(()) } } impl<'a> MacroParse for &'a mut syn::ItemImpl { fn macro_parse( self, _program: &mut ast::Program, opts: BindgenAttrs, ) -> Result<(), Diagnostic> { if self.defaultness.is_some() { bail_span!( self.defaultness, "#[wasm_bindgen] default impls are not supported" ); } if self.unsafety.is_some() { bail_span!( self.unsafety, "#[wasm_bindgen] unsafe impls are not supported" ); } if let Some((_, path, _)) = &self.trait_ { bail_span!(path, "#[wasm_bindgen] trait impls are not supported"); } if self.generics.params.len() > 0 { bail_span!( self.generics, "#[wasm_bindgen] generic impls aren't supported" ); } let name = match get_ty(&self.self_ty) { syn::Type::Path(syn::TypePath { qself: None, ref path, }) => path, _ => bail_span!( self.self_ty, "unsupported self type in #[wasm_bindgen] impl" ), }; let mut errors = Vec::new(); for item in self.items.iter_mut() { if let Err(e) = prepare_for_impl_recursion(item, &name, &opts) { errors.push(e); } } Diagnostic::from_vec(errors)?; opts.check_used()?; Ok(()) } } // Prepare for recursion into an `impl` block. Here we want to attach an // internal attribute, `__wasm_bindgen_class_marker`, with any metadata we need // to pass from the impl to the impl item. Recursive macro expansion will then // expand the `__wasm_bindgen_class_marker` attribute. // // Note that we currently do this because inner items may have things like cfgs // on them, so we want to expand the impl first, let the insides get cfg'd, and // then go for the rest. fn prepare_for_impl_recursion( item: &mut syn::ImplItem, class: &syn::Path, impl_opts: &BindgenAttrs, ) -> Result<(), Diagnostic> { let method = match item { syn::ImplItem::Method(m) => m, syn::ImplItem::Const(_) => { bail_span!( &*item, "const definitions aren't supported with #[wasm_bindgen]" ); } syn::ImplItem::Type(_) => bail_span!( &*item, "type definitions in impls aren't supported with #[wasm_bindgen]" ), syn::ImplItem::Macro(_) => { // In theory we want to allow this, but we have no way of expanding // the macro and then placing our magical attributes on the expanded // functions. As a result, just disallow it for now to hopefully // ward off buggy results from this macro. bail_span!(&*item, "macros in impls aren't supported"); } syn::ImplItem::Verbatim(_) => panic!("unparsed impl item?"), other => bail_span!(other, "failed to parse this item as a known item"), }; let ident = extract_path_ident(class)?; let js_class = impl_opts .js_class() .map(|s| s.0.to_string()) .unwrap_or(ident.to_string()); method.attrs.insert( 0, syn::Attribute { pound_token: Default::default(), style: syn::AttrStyle::Outer, bracket_token: Default::default(), path: syn::parse_quote! { wasm_bindgen::prelude::__wasm_bindgen_class_marker }, tokens: quote::quote! { (#class = #js_class) }.into(), }, ); Ok(()) } impl<'a, 'b> MacroParse<(&'a Ident, &'a str)> for &'b mut syn::ImplItemMethod { fn macro_parse( self, program: &mut ast::Program, (class, js_class): (&'a Ident, &'a str), ) -> Result<(), Diagnostic> { match self.vis { syn::Visibility::Public(_) => {} _ => return Ok(()), } if self.defaultness.is_some() { panic!("default methods are not supported"); } if self.sig.constness.is_some() { bail_span!( self.sig.constness, "can only #[wasm_bindgen] non-const functions", ); } if self.sig.unsafety.is_some() { bail_span!(self.sig.unsafety, "can only bindgen safe functions",); } let opts = BindgenAttrs::find(&mut self.attrs)?; let comments = extract_doc_comments(&self.attrs); let (function, method_self) = function_from_decl( &self.sig.ident, &opts, self.sig.clone(), self.attrs.clone(), self.vis.clone(), true, Some(class), )?; let method_kind = if opts.constructor().is_some() { ast::MethodKind::Constructor } else { let is_static = method_self.is_none(); let kind = operation_kind(&opts); ast::MethodKind::Operation(ast::Operation { is_static, kind }) }; program.exports.push(ast::Export { comments, function, js_class: Some(js_class.to_string()), method_kind, method_self, rust_class: Some(class.clone()), rust_name: self.sig.ident.clone(), start: false, }); opts.check_used()?; Ok(()) } } fn import_enum(enum_: syn::ItemEnum, program: &mut ast::Program) -> Result<(), Diagnostic> { let mut variants = vec![]; let mut variant_values = vec![]; for v in enum_.variants.iter() { match v.fields { syn::Fields::Unit => (), _ => bail_span!(v.fields, "only C-Style enums allowed with #[wasm_bindgen]"), } let (_, expr) = match &v.discriminant { Some(pair) => pair, None => { bail_span!(v, "all variants must have a value"); } }; match get_expr(expr) { syn::Expr::Lit(syn::ExprLit { attrs: _, lit: syn::Lit::Str(str_lit), }) => { variants.push(v.ident.clone()); variant_values.push(str_lit.value()); } expr => bail_span!( expr, "enums with #[wasm_bindgen] cannot mix string and non-string values", ), } } program.imports.push(ast::Import { module: ast::ImportModule::None, js_namespace: None, kind: ast::ImportKind::Enum(ast::ImportEnum { vis: enum_.vis, name: enum_.ident, variants, variant_values, rust_attrs: enum_.attrs, }), }); Ok(()) } impl<'a> MacroParse<(&'a mut TokenStream, BindgenAttrs)> for syn::ItemEnum { fn macro_parse( self, program: &mut ast::Program, (tokens, opts): (&'a mut TokenStream, BindgenAttrs), ) -> Result<(), Diagnostic> { if self.variants.len() == 0 { bail_span!(self, "cannot export empty enums to JS"); } let generate_typescript = opts.skip_typescript().is_none(); // Check if the first value is a string literal if let Some((_, expr)) = &self.variants[0].discriminant { match get_expr(expr) { syn::Expr::Lit(syn::ExprLit { attrs: _, lit: syn::Lit::Str(_), }) => { opts.check_used()?; return import_enum(self, program); } _ => {} } } let js_name = opts .js_name() .map(|s| s.0) .map_or_else(|| self.ident.to_string(), |s| s.to_string()); opts.check_used()?; let has_discriminant = self.variants[0].discriminant.is_some(); match self.vis { syn::Visibility::Public(_) => {} _ => bail_span!(self, "only public enums are allowed with #[wasm_bindgen]"), } let variants = self .variants .iter() .enumerate() .map(|(i, v)| { match v.fields { syn::Fields::Unit => (), _ => bail_span!(v.fields, "only C-Style enums allowed with #[wasm_bindgen]"), } // Require that everything either has a discriminant or doesn't. // We don't really want to get in the business of emulating how // rustc assigns values to enums. if v.discriminant.is_some() != has_discriminant { bail_span!( v, "must either annotate discriminant of all variants or none" ); } let value = match &v.discriminant { Some((_, expr)) => match get_expr(expr) { syn::Expr::Lit(syn::ExprLit { attrs: _, lit: syn::Lit::Int(int_lit), }) => match int_lit.base10_digits().parse::() { Ok(v) => v, Err(_) => { bail_span!( int_lit, "enums with #[wasm_bindgen] can only support \ numbers that can be represented as u32" ); } }, expr => bail_span!( expr, "enums with #[wasm_bindgen] may only have \ number literal values", ), }, None => i as u32, }; let comments = extract_doc_comments(&v.attrs); Ok(ast::Variant { name: v.ident.clone(), value, comments, }) }) .collect::, Diagnostic>>()?; let mut values = variants.iter().map(|v| v.value).collect::>(); values.sort(); let hole = values .windows(2) .filter_map(|window| { if window[0] + 1 != window[1] { Some(window[0] + 1) } else { None } }) .next() .unwrap_or(*values.last().unwrap() + 1); for value in values { assert!(hole != value); } let comments = extract_doc_comments(&self.attrs); self.to_tokens(tokens); program.enums.push(ast::Enum { rust_name: self.ident, js_name, variants, comments, hole, generate_typescript, }); Ok(()) } } impl MacroParse for syn::ItemConst { fn macro_parse(self, program: &mut ast::Program, opts: BindgenAttrs) -> Result<(), Diagnostic> { // Shortcut if opts.typescript_custom_section().is_none() { bail_span!(self, "#[wasm_bindgen] will not work on constants unless you are defining a #[wasm_bindgen(typescript_custom_section)]."); } match get_expr(&self.expr) { syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Str(litstr), .. }) => { program.typescript_custom_sections.push(litstr.value()); } expr => { bail_span!(expr, "Expected a string literal to be used with #[wasm_bindgen(typescript_custom_section)]."); } } opts.check_used()?; Ok(()) } } impl MacroParse for syn::ItemForeignMod { fn macro_parse(self, program: &mut ast::Program, opts: BindgenAttrs) -> Result<(), Diagnostic> { let mut errors = Vec::new(); match self.abi.name { Some(ref l) if l.value() == "C" => {} None => {} Some(ref other) => { errors.push(err_span!( other, "only foreign mods with the `C` ABI are allowed" )); } } let module = if let Some((name, span)) = opts.module() { if opts.inline_js().is_some() { let msg = "cannot specify both `module` and `inline_js`"; errors.push(Diagnostic::span_error(span, msg)); } if opts.raw_module().is_some() { let msg = "cannot specify both `module` and `raw_module`"; errors.push(Diagnostic::span_error(span, msg)); } ast::ImportModule::Named(name.to_string(), span) } else if let Some((name, span)) = opts.raw_module() { if opts.inline_js().is_some() { let msg = "cannot specify both `raw_module` and `inline_js`"; errors.push(Diagnostic::span_error(span, msg)); } ast::ImportModule::RawNamed(name.to_string(), span) } else if let Some((js, span)) = opts.inline_js() { let i = program.inline_js.len(); program.inline_js.push(js.to_string()); ast::ImportModule::Inline(i, span) } else { ast::ImportModule::None }; for item in self.items.into_iter() { if let Err(e) = item.macro_parse(program, module.clone()) { errors.push(e); } } Diagnostic::from_vec(errors)?; opts.check_used()?; Ok(()) } } impl MacroParse for syn::ForeignItem { fn macro_parse( mut self, program: &mut ast::Program, module: ast::ImportModule, ) -> Result<(), Diagnostic> { let item_opts = { let attrs = match self { syn::ForeignItem::Fn(ref mut f) => &mut f.attrs, syn::ForeignItem::Type(ref mut t) => &mut t.attrs, syn::ForeignItem::Static(ref mut s) => &mut s.attrs, _ => panic!("only foreign functions/types allowed for now"), }; BindgenAttrs::find(attrs)? }; let js_namespace = item_opts.js_namespace().map(|(s, _)| s.to_owned()); let kind = match self { syn::ForeignItem::Fn(f) => f.convert((item_opts, &module))?, syn::ForeignItem::Type(t) => t.convert(item_opts)?, syn::ForeignItem::Static(s) => s.convert((item_opts, &module))?, _ => panic!("only foreign functions/types allowed for now"), }; program.imports.push(ast::Import { module, js_namespace, kind, }); Ok(()) } } /// Get the first type parameter of a generic type, errors on incorrect input. fn extract_first_ty_param(ty: Option<&syn::Type>) -> Result, Diagnostic> { let t = match ty { Some(t) => t, None => return Ok(None), }; let path = match *get_ty(&t) { syn::Type::Path(syn::TypePath { qself: None, ref path, }) => path, _ => bail_span!(t, "must be Result<...>"), }; let seg = path .segments .last() .ok_or_else(|| err_span!(t, "must have at least one segment"))?; let generics = match seg.arguments { syn::PathArguments::AngleBracketed(ref t) => t, _ => bail_span!(t, "must be Result<...>"), }; let generic = generics .args .first() .ok_or_else(|| err_span!(t, "must have at least one generic parameter"))?; let ty = match generic { syn::GenericArgument::Type(t) => t, other => bail_span!(other, "must be a type parameter"), }; match get_ty(&ty) { syn::Type::Tuple(t) if t.elems.len() == 0 => return Ok(None), _ => {} } Ok(Some(ty.clone())) } /// Extract the documentation comments from a Vec of attributes fn extract_doc_comments(attrs: &[syn::Attribute]) -> Vec { attrs .iter() .filter_map(|a| { // if the path segments include an ident of "doc" we know this // this is a doc comment if a.path.segments.iter().any(|s| s.ident.to_string() == "doc") { Some( // We want to filter out any Puncts so just grab the Literals a.tokens.clone().into_iter().filter_map(|t| match t { TokenTree::Literal(lit) => { let quoted = lit.to_string(); Some(try_unescape("ed).unwrap_or_else(|| quoted)) } _ => None, }), ) } else { None } }) //Fold up the [[String]] iter we created into Vec .fold(vec![], |mut acc, a| { acc.extend(a); acc }) } // Unescapes a quoted string. char::escape_debug() was used to escape the text. fn try_unescape(s: &str) -> Option { if s.is_empty() { return Some(String::new()); } let mut result = String::with_capacity(s.len()); let mut chars = s.chars(); for i in 0.. { let c = match chars.next() { Some(c) => c, None => { if result.ends_with('"') { result.pop(); } return Some(result); } }; if i == 0 && c == '"' { // ignore it } else if c == '\\' { let c = chars.next()?; match c { 't' => result.push('\t'), 'r' => result.push('\r'), 'n' => result.push('\n'), '\\' | '\'' | '"' => result.push(c), 'u' => { if chars.next() != Some('{') { return None; } let (c, next) = unescape_unicode(&mut chars)?; result.push(c); if next != '}' { return None; } } _ => return None, } } else { result.push(c); } } None } fn unescape_unicode(chars: &mut Chars) -> Option<(char, char)> { let mut value = 0; for i in 0..7 { let c = chars.next()?; let num = if c >= '0' && c <= '9' { c as u32 - '0' as u32 } else if c >= 'a' && c <= 'f' { c as u32 - 'a' as u32 + 10 } else if c >= 'A' && c <= 'F' { c as u32 - 'A' as u32 + 10 } else { if i == 0 { return None; } let decoded = char::from_u32(value)?; return Some((decoded, c)); }; if i >= 6 { return None; } value = (value << 4) | num; } None } /// Check there are no lifetimes on the function. fn assert_no_lifetimes(sig: &syn::Signature) -> Result<(), Diagnostic> { struct Walk { diagnostics: Vec, } impl<'ast> syn::visit::Visit<'ast> for Walk { fn visit_lifetime(&mut self, i: &'ast syn::Lifetime) { self.diagnostics.push(err_span!( &*i, "it is currently not sound to use lifetimes in function \ signatures" )); } } let mut walk = Walk { diagnostics: Vec::new(), }; syn::visit::Visit::visit_signature(&mut walk, sig); Diagnostic::from_vec(walk.diagnostics) } /// This method always fails if the BindgenAttrs contain variadic fn assert_not_variadic(attrs: &BindgenAttrs) -> Result<(), Diagnostic> { if let Some(span) = attrs.variadic() { let msg = "the `variadic` attribute can only be applied to imported \ (`extern`) functions"; return Err(Diagnostic::span_error(*span, msg)); } Ok(()) } /// Extracts the last ident from the path fn extract_path_ident(path: &syn::Path) -> Result { for segment in path.segments.iter() { match segment.arguments { syn::PathArguments::None => {} _ => bail_span!(path, "paths with type parameters are not supported yet"), } } match path.segments.last() { Some(value) => Ok(value.ident.clone()), None => { bail_span!(path, "empty idents are not supported"); } } } pub fn reset_attrs_used() { ATTRS.with(|state| { state.parsed.set(0); state.checks.set(0); }) } pub fn assert_all_attrs_checked() { ATTRS.with(|state| { assert_eq!(state.parsed.get(), state.checks.get()); }) } fn operation_kind(opts: &BindgenAttrs) -> ast::OperationKind { let mut operation_kind = ast::OperationKind::Regular; if let Some(g) = opts.getter() { operation_kind = ast::OperationKind::Getter(g.clone()); } if let Some(s) = opts.setter() { operation_kind = ast::OperationKind::Setter(s.clone()); } if opts.indexing_getter().is_some() { operation_kind = ast::OperationKind::IndexingGetter; } if opts.indexing_setter().is_some() { operation_kind = ast::OperationKind::IndexingSetter; } if opts.indexing_deleter().is_some() { operation_kind = ast::OperationKind::IndexingDeleter; } operation_kind }