| // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Functions dealing with attributes and meta items |
| |
| pub use self::StabilityLevel::*; |
| pub use self::ReprAttr::*; |
| pub use self::IntType::*; |
| |
| use ast; |
| use ast::{AttrId, Attribute, Name, Ident}; |
| use ast::{MetaItem, MetaItemKind, NestedMetaItem, NestedMetaItemKind}; |
| use ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind}; |
| use codemap::{Spanned, respan, dummy_spanned}; |
| use syntax_pos::{Span, DUMMY_SP}; |
| use errors::Handler; |
| use feature_gate::{Features, GatedCfg}; |
| use parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration}; |
| use parse::parser::Parser; |
| use parse::{self, ParseSess, PResult}; |
| use parse::token::{self, Token}; |
| use ptr::P; |
| use symbol::Symbol; |
| use tokenstream::{TokenStream, TokenTree, Delimited}; |
| use util::ThinVec; |
| |
| use std::cell::RefCell; |
| use std::iter; |
| |
| thread_local! { |
| static USED_ATTRS: RefCell<Vec<u64>> = RefCell::new(Vec::new()); |
| static KNOWN_ATTRS: RefCell<Vec<u64>> = RefCell::new(Vec::new()); |
| } |
| |
| enum AttrError { |
| MultipleItem(Name), |
| UnknownMetaItem(Name), |
| MissingSince, |
| MissingFeature, |
| MultipleStabilityLevels, |
| UnsupportedLiteral |
| } |
| |
| fn handle_errors(diag: &Handler, span: Span, error: AttrError) { |
| match error { |
| AttrError::MultipleItem(item) => span_err!(diag, span, E0538, |
| "multiple '{}' items", item), |
| AttrError::UnknownMetaItem(item) => span_err!(diag, span, E0541, |
| "unknown meta item '{}'", item), |
| AttrError::MissingSince => span_err!(diag, span, E0542, "missing 'since'"), |
| AttrError::MissingFeature => span_err!(diag, span, E0546, "missing 'feature'"), |
| AttrError::MultipleStabilityLevels => span_err!(diag, span, E0544, |
| "multiple stability levels"), |
| AttrError::UnsupportedLiteral => span_err!(diag, span, E0565, "unsupported literal"), |
| } |
| } |
| |
| pub fn mark_used(attr: &Attribute) { |
| debug!("Marking {:?} as used.", attr); |
| let AttrId(id) = attr.id; |
| USED_ATTRS.with(|slot| { |
| let idx = (id / 64) as usize; |
| let shift = id % 64; |
| if slot.borrow().len() <= idx { |
| slot.borrow_mut().resize(idx + 1, 0); |
| } |
| slot.borrow_mut()[idx] |= 1 << shift; |
| }); |
| } |
| |
| pub fn is_used(attr: &Attribute) -> bool { |
| let AttrId(id) = attr.id; |
| USED_ATTRS.with(|slot| { |
| let idx = (id / 64) as usize; |
| let shift = id % 64; |
| slot.borrow().get(idx).map(|bits| bits & (1 << shift) != 0) |
| .unwrap_or(false) |
| }) |
| } |
| |
| pub fn mark_known(attr: &Attribute) { |
| debug!("Marking {:?} as known.", attr); |
| let AttrId(id) = attr.id; |
| KNOWN_ATTRS.with(|slot| { |
| let idx = (id / 64) as usize; |
| let shift = id % 64; |
| if slot.borrow().len() <= idx { |
| slot.borrow_mut().resize(idx + 1, 0); |
| } |
| slot.borrow_mut()[idx] |= 1 << shift; |
| }); |
| } |
| |
| pub fn is_known(attr: &Attribute) -> bool { |
| let AttrId(id) = attr.id; |
| KNOWN_ATTRS.with(|slot| { |
| let idx = (id / 64) as usize; |
| let shift = id % 64; |
| slot.borrow().get(idx).map(|bits| bits & (1 << shift) != 0) |
| .unwrap_or(false) |
| }) |
| } |
| |
| impl NestedMetaItem { |
| /// Returns the MetaItem if self is a NestedMetaItemKind::MetaItem. |
| pub fn meta_item(&self) -> Option<&MetaItem> { |
| match self.node { |
| NestedMetaItemKind::MetaItem(ref item) => Some(item), |
| _ => None |
| } |
| } |
| |
| /// Returns the Lit if self is a NestedMetaItemKind::Literal. |
| pub fn literal(&self) -> Option<&Lit> { |
| match self.node { |
| NestedMetaItemKind::Literal(ref lit) => Some(lit), |
| _ => None |
| } |
| } |
| |
| /// Returns the Span for `self`. |
| pub fn span(&self) -> Span { |
| self.span |
| } |
| |
| /// Returns true if this list item is a MetaItem with a name of `name`. |
| pub fn check_name(&self, name: &str) -> bool { |
| self.meta_item().map_or(false, |meta_item| meta_item.check_name(name)) |
| } |
| |
| /// Returns the name of the meta item, e.g. `foo` in `#[foo]`, |
| /// `#[foo="bar"]` and `#[foo(bar)]`, if self is a MetaItem |
| pub fn name(&self) -> Option<Name> { |
| self.meta_item().and_then(|meta_item| Some(meta_item.name())) |
| } |
| |
| /// Gets the string value if self is a MetaItem and the MetaItem is a |
| /// MetaItemKind::NameValue variant containing a string, otherwise None. |
| pub fn value_str(&self) -> Option<Symbol> { |
| self.meta_item().and_then(|meta_item| meta_item.value_str()) |
| } |
| |
| /// Returns a name and single literal value tuple of the MetaItem. |
| pub fn name_value_literal(&self) -> Option<(Name, &Lit)> { |
| self.meta_item().and_then( |
| |meta_item| meta_item.meta_item_list().and_then( |
| |meta_item_list| { |
| if meta_item_list.len() == 1 { |
| let nested_item = &meta_item_list[0]; |
| if nested_item.is_literal() { |
| Some((meta_item.name(), nested_item.literal().unwrap())) |
| } else { |
| None |
| } |
| } |
| else { |
| None |
| }})) |
| } |
| |
| /// Returns a MetaItem if self is a MetaItem with Kind Word. |
| pub fn word(&self) -> Option<&MetaItem> { |
| self.meta_item().and_then(|meta_item| if meta_item.is_word() { |
| Some(meta_item) |
| } else { |
| None |
| }) |
| } |
| |
| /// Gets a list of inner meta items from a list MetaItem type. |
| pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> { |
| self.meta_item().and_then(|meta_item| meta_item.meta_item_list()) |
| } |
| |
| /// Returns `true` if the variant is MetaItem. |
| pub fn is_meta_item(&self) -> bool { |
| self.meta_item().is_some() |
| } |
| |
| /// Returns `true` if the variant is Literal. |
| pub fn is_literal(&self) -> bool { |
| self.literal().is_some() |
| } |
| |
| /// Returns `true` if self is a MetaItem and the meta item is a word. |
| pub fn is_word(&self) -> bool { |
| self.word().is_some() |
| } |
| |
| /// Returns `true` if self is a MetaItem and the meta item is a ValueString. |
| pub fn is_value_str(&self) -> bool { |
| self.value_str().is_some() |
| } |
| |
| /// Returns `true` if self is a MetaItem and the meta item is a list. |
| pub fn is_meta_item_list(&self) -> bool { |
| self.meta_item_list().is_some() |
| } |
| } |
| |
| impl Attribute { |
| pub fn check_name(&self, name: &str) -> bool { |
| let matches = self.path == name; |
| if matches { |
| mark_used(self); |
| } |
| matches |
| } |
| |
| pub fn name(&self) -> Option<Name> { |
| match self.path.segments.len() { |
| 1 => Some(self.path.segments[0].identifier.name), |
| _ => None, |
| } |
| } |
| |
| pub fn value_str(&self) -> Option<Symbol> { |
| self.meta().and_then(|meta| meta.value_str()) |
| } |
| |
| pub fn meta_item_list(&self) -> Option<Vec<NestedMetaItem>> { |
| match self.meta() { |
| Some(MetaItem { node: MetaItemKind::List(list), .. }) => Some(list), |
| _ => None |
| } |
| } |
| |
| pub fn is_word(&self) -> bool { |
| self.path.segments.len() == 1 && self.tokens.is_empty() |
| } |
| |
| pub fn span(&self) -> Span { |
| self.span |
| } |
| |
| pub fn is_meta_item_list(&self) -> bool { |
| self.meta_item_list().is_some() |
| } |
| |
| /// Indicates if the attribute is a Value String. |
| pub fn is_value_str(&self) -> bool { |
| self.value_str().is_some() |
| } |
| } |
| |
| impl MetaItem { |
| pub fn name(&self) -> Name { |
| self.name |
| } |
| |
| pub fn value_str(&self) -> Option<Symbol> { |
| match self.node { |
| MetaItemKind::NameValue(ref v) => { |
| match v.node { |
| LitKind::Str(ref s, _) => Some(*s), |
| _ => None, |
| } |
| }, |
| _ => None |
| } |
| } |
| |
| pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> { |
| match self.node { |
| MetaItemKind::List(ref l) => Some(&l[..]), |
| _ => None |
| } |
| } |
| |
| pub fn is_word(&self) -> bool { |
| match self.node { |
| MetaItemKind::Word => true, |
| _ => false, |
| } |
| } |
| |
| pub fn span(&self) -> Span { self.span } |
| |
| pub fn check_name(&self, name: &str) -> bool { |
| self.name() == name |
| } |
| |
| pub fn is_value_str(&self) -> bool { |
| self.value_str().is_some() |
| } |
| |
| pub fn is_meta_item_list(&self) -> bool { |
| self.meta_item_list().is_some() |
| } |
| } |
| |
| impl Attribute { |
| /// Extract the MetaItem from inside this Attribute. |
| pub fn meta(&self) -> Option<MetaItem> { |
| let mut tokens = self.tokens.trees().peekable(); |
| Some(MetaItem { |
| name: match self.path.segments.len() { |
| 1 => self.path.segments[0].identifier.name, |
| _ => return None, |
| }, |
| node: if let Some(node) = MetaItemKind::from_tokens(&mut tokens) { |
| if tokens.peek().is_some() { |
| return None; |
| } |
| node |
| } else { |
| return None; |
| }, |
| span: self.span, |
| }) |
| } |
| |
| pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T> |
| where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>, |
| { |
| let mut parser = Parser::new(sess, self.tokens.clone(), None, false, false); |
| let result = f(&mut parser)?; |
| if parser.token != token::Eof { |
| parser.unexpected()?; |
| } |
| Ok(result) |
| } |
| |
| pub fn parse_list<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, Vec<T>> |
| where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>, |
| { |
| if self.tokens.is_empty() { |
| return Ok(Vec::new()); |
| } |
| self.parse(sess, |parser| { |
| parser.expect(&token::OpenDelim(token::Paren))?; |
| let mut list = Vec::new(); |
| while !parser.eat(&token::CloseDelim(token::Paren)) { |
| list.push(f(parser)?); |
| if !parser.eat(&token::Comma) { |
| parser.expect(&token::CloseDelim(token::Paren))?; |
| break |
| } |
| } |
| Ok(list) |
| }) |
| } |
| |
| pub fn parse_meta<'a>(&self, sess: &'a ParseSess) -> PResult<'a, MetaItem> { |
| if self.path.segments.len() > 1 { |
| sess.span_diagnostic.span_err(self.path.span, "expected ident, found path"); |
| } |
| |
| Ok(MetaItem { |
| name: self.path.segments.last().unwrap().identifier.name, |
| node: self.parse(sess, |parser| parser.parse_meta_item_kind())?, |
| span: self.span, |
| }) |
| } |
| |
| /// Convert self to a normal #[doc="foo"] comment, if it is a |
| /// comment like `///` or `/** */`. (Returns self unchanged for |
| /// non-sugared doc attributes.) |
| pub fn with_desugared_doc<T, F>(&self, f: F) -> T where |
| F: FnOnce(&Attribute) -> T, |
| { |
| if self.is_sugared_doc { |
| let comment = self.value_str().unwrap(); |
| let meta = mk_name_value_item_str( |
| Symbol::intern("doc"), |
| Symbol::intern(&strip_doc_comment_decoration(&comment.as_str()))); |
| let mut attr = if self.style == ast::AttrStyle::Outer { |
| mk_attr_outer(self.span, self.id, meta) |
| } else { |
| mk_attr_inner(self.span, self.id, meta) |
| }; |
| attr.is_sugared_doc = true; |
| f(&attr) |
| } else { |
| f(self) |
| } |
| } |
| } |
| |
| /* Constructors */ |
| |
| pub fn mk_name_value_item_str(name: Name, value: Symbol) -> MetaItem { |
| let value_lit = dummy_spanned(LitKind::Str(value, ast::StrStyle::Cooked)); |
| mk_spanned_name_value_item(DUMMY_SP, name, value_lit) |
| } |
| |
| pub fn mk_name_value_item(name: Name, value: ast::Lit) -> MetaItem { |
| mk_spanned_name_value_item(DUMMY_SP, name, value) |
| } |
| |
| pub fn mk_list_item(name: Name, items: Vec<NestedMetaItem>) -> MetaItem { |
| mk_spanned_list_item(DUMMY_SP, name, items) |
| } |
| |
| pub fn mk_list_word_item(name: Name) -> ast::NestedMetaItem { |
| dummy_spanned(NestedMetaItemKind::MetaItem(mk_spanned_word_item(DUMMY_SP, name))) |
| } |
| |
| pub fn mk_word_item(name: Name) -> MetaItem { |
| mk_spanned_word_item(DUMMY_SP, name) |
| } |
| |
| pub fn mk_spanned_name_value_item(sp: Span, name: Name, value: ast::Lit) -> MetaItem { |
| MetaItem { span: sp, name: name, node: MetaItemKind::NameValue(value) } |
| } |
| |
| pub fn mk_spanned_list_item(sp: Span, name: Name, items: Vec<NestedMetaItem>) -> MetaItem { |
| MetaItem { span: sp, name: name, node: MetaItemKind::List(items) } |
| } |
| |
| pub fn mk_spanned_word_item(sp: Span, name: Name) -> MetaItem { |
| MetaItem { span: sp, name: name, node: MetaItemKind::Word } |
| } |
| |
| pub fn mk_attr_id() -> AttrId { |
| use std::sync::atomic::AtomicUsize; |
| use std::sync::atomic::Ordering; |
| |
| static NEXT_ATTR_ID: AtomicUsize = AtomicUsize::new(0); |
| |
| let id = NEXT_ATTR_ID.fetch_add(1, Ordering::SeqCst); |
| assert!(id != ::std::usize::MAX); |
| AttrId(id) |
| } |
| |
| /// Returns an inner attribute with the given value. |
| pub fn mk_attr_inner(span: Span, id: AttrId, item: MetaItem) -> Attribute { |
| mk_spanned_attr_inner(span, id, item) |
| } |
| |
| /// Returns an inner attribute with the given value and span. |
| pub fn mk_spanned_attr_inner(sp: Span, id: AttrId, item: MetaItem) -> Attribute { |
| Attribute { |
| id, |
| style: ast::AttrStyle::Inner, |
| path: ast::Path::from_ident(item.span, ast::Ident::with_empty_ctxt(item.name)), |
| tokens: item.node.tokens(item.span), |
| is_sugared_doc: false, |
| span: sp, |
| } |
| } |
| |
| |
| /// Returns an outer attribute with the given value. |
| pub fn mk_attr_outer(span: Span, id: AttrId, item: MetaItem) -> Attribute { |
| mk_spanned_attr_outer(span, id, item) |
| } |
| |
| /// Returns an outer attribute with the given value and span. |
| pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute { |
| Attribute { |
| id, |
| style: ast::AttrStyle::Outer, |
| path: ast::Path::from_ident(item.span, ast::Ident::with_empty_ctxt(item.name)), |
| tokens: item.node.tokens(item.span), |
| is_sugared_doc: false, |
| span: sp, |
| } |
| } |
| |
| pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute { |
| let style = doc_comment_style(&text.as_str()); |
| let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked)); |
| Attribute { |
| id, |
| style, |
| path: ast::Path::from_ident(span, ast::Ident::from_str("doc")), |
| tokens: MetaItemKind::NameValue(lit).tokens(span), |
| is_sugared_doc: true, |
| span, |
| } |
| } |
| |
| pub fn list_contains_name(items: &[NestedMetaItem], name: &str) -> bool { |
| items.iter().any(|item| { |
| item.check_name(name) |
| }) |
| } |
| |
| pub fn contains_name(attrs: &[Attribute], name: &str) -> bool { |
| attrs.iter().any(|item| { |
| item.check_name(name) |
| }) |
| } |
| |
| pub fn find_by_name<'a>(attrs: &'a [Attribute], name: &str) -> Option<&'a Attribute> { |
| attrs.iter().find(|attr| attr.check_name(name)) |
| } |
| |
| pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> { |
| attrs.iter() |
| .find(|at| at.check_name(name)) |
| .and_then(|at| at.value_str()) |
| } |
| |
| /// Check if `attrs` contains an attribute like `#![feature(feature_name)]`. |
| /// This will not perform any "sanity checks" on the form of the attributes. |
| pub fn contains_feature_attr(attrs: &[Attribute], feature_name: &str) -> bool { |
| attrs.iter().any(|item| { |
| item.check_name("feature") && |
| item.meta_item_list().map(|list| { |
| list.iter().any(|mi| { |
| mi.word().map(|w| w.name() == feature_name) |
| .unwrap_or(false) |
| }) |
| }).unwrap_or(false) |
| }) |
| } |
| |
| /* Higher-level applications */ |
| |
| pub fn find_crate_name(attrs: &[Attribute]) -> Option<Symbol> { |
| first_attr_value_str_by_name(attrs, "crate_name") |
| } |
| |
| #[derive(Copy, Clone, PartialEq)] |
| pub enum InlineAttr { |
| None, |
| Hint, |
| Always, |
| Never, |
| } |
| |
| /// Determine what `#[inline]` attribute is present in `attrs`, if any. |
| pub fn find_inline_attr(diagnostic: Option<&Handler>, attrs: &[Attribute]) -> InlineAttr { |
| attrs.iter().fold(InlineAttr::None, |ia, attr| { |
| if attr.path != "inline" { |
| return ia; |
| } |
| let meta = match attr.meta() { |
| Some(meta) => meta.node, |
| None => return ia, |
| }; |
| match meta { |
| MetaItemKind::Word => { |
| mark_used(attr); |
| InlineAttr::Hint |
| } |
| MetaItemKind::List(ref items) => { |
| mark_used(attr); |
| if items.len() != 1 { |
| diagnostic.map(|d|{ span_err!(d, attr.span, E0534, "expected one argument"); }); |
| InlineAttr::None |
| } else if list_contains_name(&items[..], "always") { |
| InlineAttr::Always |
| } else if list_contains_name(&items[..], "never") { |
| InlineAttr::Never |
| } else { |
| diagnostic.map(|d| { |
| span_err!(d, items[0].span, E0535, "invalid argument"); |
| }); |
| |
| InlineAttr::None |
| } |
| } |
| _ => ia, |
| } |
| }) |
| } |
| |
| /// True if `#[inline]` or `#[inline(always)]` is present in `attrs`. |
| pub fn requests_inline(attrs: &[Attribute]) -> bool { |
| match find_inline_attr(None, attrs) { |
| InlineAttr::Hint | InlineAttr::Always => true, |
| InlineAttr::None | InlineAttr::Never => false, |
| } |
| } |
| |
| /// Tests if a cfg-pattern matches the cfg set |
| pub fn cfg_matches(cfg: &ast::MetaItem, sess: &ParseSess, features: Option<&Features>) -> bool { |
| eval_condition(cfg, sess, &mut |cfg| { |
| if let (Some(feats), Some(gated_cfg)) = (features, GatedCfg::gate(cfg)) { |
| gated_cfg.check_and_emit(sess, feats); |
| } |
| sess.config.contains(&(cfg.name(), cfg.value_str())) |
| }) |
| } |
| |
| /// Evaluate a cfg-like condition (with `any` and `all`), using `eval` to |
| /// evaluate individual items. |
| pub fn eval_condition<F>(cfg: &ast::MetaItem, sess: &ParseSess, eval: &mut F) |
| -> bool |
| where F: FnMut(&ast::MetaItem) -> bool |
| { |
| match cfg.node { |
| ast::MetaItemKind::List(ref mis) => { |
| for mi in mis.iter() { |
| if !mi.is_meta_item() { |
| handle_errors(&sess.span_diagnostic, mi.span, AttrError::UnsupportedLiteral); |
| return false; |
| } |
| } |
| |
| // The unwraps below may look dangerous, but we've already asserted |
| // that they won't fail with the loop above. |
| match &*cfg.name.as_str() { |
| "any" => mis.iter().any(|mi| { |
| eval_condition(mi.meta_item().unwrap(), sess, eval) |
| }), |
| "all" => mis.iter().all(|mi| { |
| eval_condition(mi.meta_item().unwrap(), sess, eval) |
| }), |
| "not" => { |
| if mis.len() != 1 { |
| span_err!(sess.span_diagnostic, cfg.span, E0536, "expected 1 cfg-pattern"); |
| return false; |
| } |
| |
| !eval_condition(mis[0].meta_item().unwrap(), sess, eval) |
| }, |
| p => { |
| span_err!(sess.span_diagnostic, cfg.span, E0537, "invalid predicate `{}`", p); |
| false |
| } |
| } |
| }, |
| ast::MetaItemKind::Word | ast::MetaItemKind::NameValue(..) => { |
| eval(cfg) |
| } |
| } |
| } |
| |
| /// Represents the #[stable], #[unstable], #[rustc_{deprecated,const_unstable}] attributes. |
| #[derive(RustcEncodable, RustcDecodable, Clone, Debug, PartialEq, Eq, Hash)] |
| pub struct Stability { |
| pub level: StabilityLevel, |
| pub feature: Symbol, |
| pub rustc_depr: Option<RustcDeprecation>, |
| pub rustc_const_unstable: Option<RustcConstUnstable>, |
| } |
| |
| /// The available stability levels. |
| #[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)] |
| pub enum StabilityLevel { |
| // Reason for the current stability level and the relevant rust-lang issue |
| Unstable { reason: Option<Symbol>, issue: u32 }, |
| Stable { since: Symbol }, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)] |
| pub struct RustcDeprecation { |
| pub since: Symbol, |
| pub reason: Symbol, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)] |
| pub struct RustcConstUnstable { |
| pub feature: Symbol, |
| } |
| |
| #[derive(RustcEncodable, RustcDecodable, PartialEq, PartialOrd, Clone, Debug, Eq, Hash)] |
| pub struct Deprecation { |
| pub since: Option<Symbol>, |
| pub note: Option<Symbol>, |
| } |
| |
| impl StabilityLevel { |
| pub fn is_unstable(&self) -> bool { if let Unstable {..} = *self { true } else { false }} |
| pub fn is_stable(&self) -> bool { if let Stable {..} = *self { true } else { false }} |
| } |
| |
| fn find_stability_generic<'a, I>(diagnostic: &Handler, |
| attrs_iter: I, |
| item_sp: Span) |
| -> Option<Stability> |
| where I: Iterator<Item = &'a Attribute> |
| { |
| let mut stab: Option<Stability> = None; |
| let mut rustc_depr: Option<RustcDeprecation> = None; |
| let mut rustc_const_unstable: Option<RustcConstUnstable> = None; |
| |
| 'outer: for attr in attrs_iter { |
| if ![ |
| "rustc_deprecated", |
| "rustc_const_unstable", |
| "unstable", |
| "stable", |
| ].iter().any(|&s| attr.path == s) { |
| continue // not a stability level |
| } |
| |
| mark_used(attr); |
| |
| let meta = attr.meta(); |
| if let Some(MetaItem { node: MetaItemKind::List(ref metas), .. }) = meta { |
| let meta = meta.as_ref().unwrap(); |
| let get = |meta: &MetaItem, item: &mut Option<Symbol>| { |
| if item.is_some() { |
| handle_errors(diagnostic, meta.span, AttrError::MultipleItem(meta.name())); |
| return false |
| } |
| if let Some(v) = meta.value_str() { |
| *item = Some(v); |
| true |
| } else { |
| span_err!(diagnostic, meta.span, E0539, "incorrect meta item"); |
| false |
| } |
| }; |
| |
| macro_rules! get_meta { |
| ($($name:ident),+) => { |
| $( |
| let mut $name = None; |
| )+ |
| for meta in metas { |
| if let Some(mi) = meta.meta_item() { |
| match &*mi.name().as_str() { |
| $( |
| stringify!($name) |
| => if !get(mi, &mut $name) { continue 'outer }, |
| )+ |
| _ => { |
| handle_errors(diagnostic, mi.span, |
| AttrError::UnknownMetaItem(mi.name())); |
| continue 'outer |
| } |
| } |
| } else { |
| handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral); |
| continue 'outer |
| } |
| } |
| } |
| } |
| |
| match &*meta.name.as_str() { |
| "rustc_deprecated" => { |
| if rustc_depr.is_some() { |
| span_err!(diagnostic, item_sp, E0540, |
| "multiple rustc_deprecated attributes"); |
| continue 'outer |
| } |
| |
| get_meta!(since, reason); |
| |
| match (since, reason) { |
| (Some(since), Some(reason)) => { |
| rustc_depr = Some(RustcDeprecation { |
| since, |
| reason, |
| }) |
| } |
| (None, _) => { |
| handle_errors(diagnostic, attr.span(), AttrError::MissingSince); |
| continue |
| } |
| _ => { |
| span_err!(diagnostic, attr.span(), E0543, "missing 'reason'"); |
| continue |
| } |
| } |
| } |
| "rustc_const_unstable" => { |
| if rustc_const_unstable.is_some() { |
| span_err!(diagnostic, item_sp, E0553, |
| "multiple rustc_const_unstable attributes"); |
| continue 'outer |
| } |
| |
| get_meta!(feature); |
| if let Some(feature) = feature { |
| rustc_const_unstable = Some(RustcConstUnstable { |
| feature |
| }); |
| } else { |
| span_err!(diagnostic, attr.span(), E0629, "missing 'feature'"); |
| continue |
| } |
| } |
| "unstable" => { |
| if stab.is_some() { |
| handle_errors(diagnostic, attr.span(), AttrError::MultipleStabilityLevels); |
| break |
| } |
| |
| let mut feature = None; |
| let mut reason = None; |
| let mut issue = None; |
| for meta in metas { |
| if let Some(mi) = meta.meta_item() { |
| match &*mi.name().as_str() { |
| "feature" => if !get(mi, &mut feature) { continue 'outer }, |
| "reason" => if !get(mi, &mut reason) { continue 'outer }, |
| "issue" => if !get(mi, &mut issue) { continue 'outer }, |
| _ => { |
| handle_errors(diagnostic, meta.span, |
| AttrError::UnknownMetaItem(mi.name())); |
| continue 'outer |
| } |
| } |
| } else { |
| handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral); |
| continue 'outer |
| } |
| } |
| |
| match (feature, reason, issue) { |
| (Some(feature), reason, Some(issue)) => { |
| stab = Some(Stability { |
| level: Unstable { |
| reason, |
| issue: { |
| if let Ok(issue) = issue.as_str().parse() { |
| issue |
| } else { |
| span_err!(diagnostic, attr.span(), E0545, |
| "incorrect 'issue'"); |
| continue |
| } |
| } |
| }, |
| feature, |
| rustc_depr: None, |
| rustc_const_unstable: None, |
| }) |
| } |
| (None, _, _) => { |
| handle_errors(diagnostic, attr.span(), AttrError::MissingFeature); |
| continue |
| } |
| _ => { |
| span_err!(diagnostic, attr.span(), E0547, "missing 'issue'"); |
| continue |
| } |
| } |
| } |
| "stable" => { |
| if stab.is_some() { |
| handle_errors(diagnostic, attr.span(), AttrError::MultipleStabilityLevels); |
| break |
| } |
| |
| let mut feature = None; |
| let mut since = None; |
| for meta in metas { |
| if let NestedMetaItemKind::MetaItem(ref mi) = meta.node { |
| match &*mi.name().as_str() { |
| "feature" => if !get(mi, &mut feature) { continue 'outer }, |
| "since" => if !get(mi, &mut since) { continue 'outer }, |
| _ => { |
| handle_errors(diagnostic, meta.span, |
| AttrError::UnknownMetaItem(mi.name())); |
| continue 'outer |
| } |
| } |
| } else { |
| handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral); |
| continue 'outer |
| } |
| } |
| |
| match (feature, since) { |
| (Some(feature), Some(since)) => { |
| stab = Some(Stability { |
| level: Stable { |
| since, |
| }, |
| feature, |
| rustc_depr: None, |
| rustc_const_unstable: None, |
| }) |
| } |
| (None, _) => { |
| handle_errors(diagnostic, attr.span(), AttrError::MissingFeature); |
| continue |
| } |
| _ => { |
| handle_errors(diagnostic, attr.span(), AttrError::MissingSince); |
| continue |
| } |
| } |
| } |
| _ => unreachable!() |
| } |
| } else { |
| span_err!(diagnostic, attr.span(), E0548, "incorrect stability attribute type"); |
| continue |
| } |
| } |
| |
| // Merge the deprecation info into the stability info |
| if let Some(rustc_depr) = rustc_depr { |
| if let Some(ref mut stab) = stab { |
| stab.rustc_depr = Some(rustc_depr); |
| } else { |
| span_err!(diagnostic, item_sp, E0549, |
| "rustc_deprecated attribute must be paired with \ |
| either stable or unstable attribute"); |
| } |
| } |
| |
| // Merge the const-unstable info into the stability info |
| if let Some(rustc_const_unstable) = rustc_const_unstable { |
| if let Some(ref mut stab) = stab { |
| stab.rustc_const_unstable = Some(rustc_const_unstable); |
| } else { |
| span_err!(diagnostic, item_sp, E0630, |
| "rustc_const_unstable attribute must be paired with \ |
| either stable or unstable attribute"); |
| } |
| } |
| |
| stab |
| } |
| |
| fn find_deprecation_generic<'a, I>(diagnostic: &Handler, |
| attrs_iter: I, |
| item_sp: Span) |
| -> Option<Deprecation> |
| where I: Iterator<Item = &'a Attribute> |
| { |
| let mut depr: Option<Deprecation> = None; |
| |
| 'outer: for attr in attrs_iter { |
| if attr.path != "deprecated" { |
| continue |
| } |
| |
| mark_used(attr); |
| |
| if depr.is_some() { |
| span_err!(diagnostic, item_sp, E0550, "multiple deprecated attributes"); |
| break |
| } |
| |
| depr = if let Some(metas) = attr.meta_item_list() { |
| let get = |meta: &MetaItem, item: &mut Option<Symbol>| { |
| if item.is_some() { |
| handle_errors(diagnostic, meta.span, AttrError::MultipleItem(meta.name())); |
| return false |
| } |
| if let Some(v) = meta.value_str() { |
| *item = Some(v); |
| true |
| } else { |
| span_err!(diagnostic, meta.span, E0551, "incorrect meta item"); |
| false |
| } |
| }; |
| |
| let mut since = None; |
| let mut note = None; |
| for meta in metas { |
| if let NestedMetaItemKind::MetaItem(ref mi) = meta.node { |
| match &*mi.name().as_str() { |
| "since" => if !get(mi, &mut since) { continue 'outer }, |
| "note" => if !get(mi, &mut note) { continue 'outer }, |
| _ => { |
| handle_errors(diagnostic, meta.span, |
| AttrError::UnknownMetaItem(mi.name())); |
| continue 'outer |
| } |
| } |
| } else { |
| handle_errors(diagnostic, meta.span, AttrError::UnsupportedLiteral); |
| continue 'outer |
| } |
| } |
| |
| Some(Deprecation {since: since, note: note}) |
| } else { |
| Some(Deprecation{since: None, note: None}) |
| } |
| } |
| |
| depr |
| } |
| |
| /// Find the first stability attribute. `None` if none exists. |
| pub fn find_stability(diagnostic: &Handler, attrs: &[Attribute], |
| item_sp: Span) -> Option<Stability> { |
| find_stability_generic(diagnostic, attrs.iter(), item_sp) |
| } |
| |
| /// Find the deprecation attribute. `None` if none exists. |
| pub fn find_deprecation(diagnostic: &Handler, attrs: &[Attribute], |
| item_sp: Span) -> Option<Deprecation> { |
| find_deprecation_generic(diagnostic, attrs.iter(), item_sp) |
| } |
| |
| |
| /// Parse #[repr(...)] forms. |
| /// |
| /// Valid repr contents: any of the primitive integral type names (see |
| /// `int_type_of_word`, below) to specify enum discriminant type; `C`, to use |
| /// the same discriminant size that the corresponding C enum would or C |
| /// structure layout, and `packed` to remove padding. |
| pub fn find_repr_attrs(diagnostic: &Handler, attr: &Attribute) -> Vec<ReprAttr> { |
| let mut acc = Vec::new(); |
| if attr.path == "repr" { |
| if let Some(items) = attr.meta_item_list() { |
| mark_used(attr); |
| for item in items { |
| if !item.is_meta_item() { |
| handle_errors(diagnostic, item.span, AttrError::UnsupportedLiteral); |
| continue |
| } |
| |
| let mut recognised = false; |
| if let Some(mi) = item.word() { |
| let word = &*mi.name().as_str(); |
| let hint = match word { |
| "C" => Some(ReprC), |
| "packed" => Some(ReprPacked), |
| "simd" => Some(ReprSimd), |
| _ => match int_type_of_word(word) { |
| Some(ity) => Some(ReprInt(ity)), |
| None => { |
| None |
| } |
| } |
| }; |
| |
| if let Some(h) = hint { |
| recognised = true; |
| acc.push(h); |
| } |
| } else if let Some((name, value)) = item.name_value_literal() { |
| if name == "align" { |
| recognised = true; |
| let mut align_error = None; |
| if let ast::LitKind::Int(align, ast::LitIntType::Unsuffixed) = value.node { |
| if align.is_power_of_two() { |
| // rustc::ty::layout::Align restricts align to <= 2147483647 |
| if align <= 2147483647 { |
| acc.push(ReprAlign(align as u32)); |
| } else { |
| align_error = Some("larger than 2147483647"); |
| } |
| } else { |
| align_error = Some("not a power of two"); |
| } |
| } else { |
| align_error = Some("not an unsuffixed integer"); |
| } |
| if let Some(align_error) = align_error { |
| span_err!(diagnostic, item.span, E0589, |
| "invalid `repr(align)` attribute: {}", align_error); |
| } |
| } |
| } |
| if !recognised { |
| // Not a word we recognize |
| span_err!(diagnostic, item.span, E0552, |
| "unrecognized representation hint"); |
| } |
| } |
| } |
| } |
| acc |
| } |
| |
| fn int_type_of_word(s: &str) -> Option<IntType> { |
| match s { |
| "i8" => Some(SignedInt(ast::IntTy::I8)), |
| "u8" => Some(UnsignedInt(ast::UintTy::U8)), |
| "i16" => Some(SignedInt(ast::IntTy::I16)), |
| "u16" => Some(UnsignedInt(ast::UintTy::U16)), |
| "i32" => Some(SignedInt(ast::IntTy::I32)), |
| "u32" => Some(UnsignedInt(ast::UintTy::U32)), |
| "i64" => Some(SignedInt(ast::IntTy::I64)), |
| "u64" => Some(UnsignedInt(ast::UintTy::U64)), |
| "i128" => Some(SignedInt(ast::IntTy::I128)), |
| "u128" => Some(UnsignedInt(ast::UintTy::U128)), |
| "isize" => Some(SignedInt(ast::IntTy::Isize)), |
| "usize" => Some(UnsignedInt(ast::UintTy::Usize)), |
| _ => None |
| } |
| } |
| |
| #[derive(PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)] |
| pub enum ReprAttr { |
| ReprInt(IntType), |
| ReprC, |
| ReprPacked, |
| ReprSimd, |
| ReprAlign(u32), |
| } |
| |
| #[derive(Eq, Hash, PartialEq, Debug, RustcEncodable, RustcDecodable, Copy, Clone)] |
| pub enum IntType { |
| SignedInt(ast::IntTy), |
| UnsignedInt(ast::UintTy) |
| } |
| |
| impl IntType { |
| #[inline] |
| pub fn is_signed(self) -> bool { |
| match self { |
| SignedInt(..) => true, |
| UnsignedInt(..) => false |
| } |
| } |
| } |
| |
| impl MetaItem { |
| fn tokens(&self) -> TokenStream { |
| let ident = TokenTree::Token(self.span, Token::Ident(Ident::with_empty_ctxt(self.name))); |
| TokenStream::concat(vec![ident.into(), self.node.tokens(self.span)]) |
| } |
| |
| fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem> |
| where I: Iterator<Item = TokenTree>, |
| { |
| let (span, name) = match tokens.next() { |
| Some(TokenTree::Token(span, Token::Ident(ident))) => (span, ident.name), |
| Some(TokenTree::Token(_, Token::Interpolated(ref nt))) => match nt.0 { |
| token::Nonterminal::NtIdent(ident) => (ident.span, ident.node.name), |
| token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()), |
| _ => return None, |
| }, |
| _ => return None, |
| }; |
| let list_closing_paren_pos = tokens.peek().map(|tt| tt.span().hi()); |
| let node = MetaItemKind::from_tokens(tokens)?; |
| let hi = match node { |
| MetaItemKind::NameValue(ref lit) => lit.span.hi(), |
| MetaItemKind::List(..) => list_closing_paren_pos.unwrap_or(span.hi()), |
| _ => span.hi(), |
| }; |
| Some(MetaItem { name, node, span: span.with_hi(hi) }) |
| } |
| } |
| |
| impl MetaItemKind { |
| pub fn tokens(&self, span: Span) -> TokenStream { |
| match *self { |
| MetaItemKind::Word => TokenStream::empty(), |
| MetaItemKind::NameValue(ref lit) => { |
| TokenStream::concat(vec![TokenTree::Token(span, Token::Eq).into(), lit.tokens()]) |
| } |
| MetaItemKind::List(ref list) => { |
| let mut tokens = Vec::new(); |
| for (i, item) in list.iter().enumerate() { |
| if i > 0 { |
| tokens.push(TokenTree::Token(span, Token::Comma).into()); |
| } |
| tokens.push(item.node.tokens()); |
| } |
| TokenTree::Delimited(span, Delimited { |
| delim: token::Paren, |
| tts: TokenStream::concat(tokens).into(), |
| }).into() |
| } |
| } |
| } |
| |
| fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind> |
| where I: Iterator<Item = TokenTree>, |
| { |
| let delimited = match tokens.peek().cloned() { |
| Some(TokenTree::Token(_, token::Eq)) => { |
| tokens.next(); |
| return if let Some(TokenTree::Token(span, token)) = tokens.next() { |
| LitKind::from_token(token) |
| .map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span })) |
| } else { |
| None |
| }; |
| } |
| Some(TokenTree::Delimited(_, ref delimited)) if delimited.delim == token::Paren => { |
| tokens.next(); |
| delimited.stream() |
| } |
| _ => return Some(MetaItemKind::Word), |
| }; |
| |
| let mut tokens = delimited.into_trees().peekable(); |
| let mut result = Vec::new(); |
| while let Some(..) = tokens.peek() { |
| let item = NestedMetaItemKind::from_tokens(&mut tokens)?; |
| result.push(respan(item.span(), item)); |
| match tokens.next() { |
| None | Some(TokenTree::Token(_, Token::Comma)) => {} |
| _ => return None, |
| } |
| } |
| Some(MetaItemKind::List(result)) |
| } |
| } |
| |
| impl NestedMetaItemKind { |
| fn span(&self) -> Span { |
| match *self { |
| NestedMetaItemKind::MetaItem(ref item) => item.span, |
| NestedMetaItemKind::Literal(ref lit) => lit.span, |
| } |
| } |
| |
| fn tokens(&self) -> TokenStream { |
| match *self { |
| NestedMetaItemKind::MetaItem(ref item) => item.tokens(), |
| NestedMetaItemKind::Literal(ref lit) => lit.tokens(), |
| } |
| } |
| |
| fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItemKind> |
| where I: Iterator<Item = TokenTree>, |
| { |
| if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() { |
| if let Some(node) = LitKind::from_token(token) { |
| tokens.next(); |
| return Some(NestedMetaItemKind::Literal(respan(span, node))); |
| } |
| } |
| |
| MetaItem::from_tokens(tokens).map(NestedMetaItemKind::MetaItem) |
| } |
| } |
| |
| impl Lit { |
| fn tokens(&self) -> TokenStream { |
| TokenTree::Token(self.span, self.node.token()).into() |
| } |
| } |
| |
| impl LitKind { |
| fn token(&self) -> Token { |
| use std::ascii; |
| |
| match *self { |
| LitKind::Str(string, ast::StrStyle::Cooked) => { |
| let mut escaped = String::new(); |
| for ch in string.as_str().chars() { |
| escaped.extend(ch.escape_unicode()); |
| } |
| Token::Literal(token::Lit::Str_(Symbol::intern(&escaped)), None) |
| } |
| LitKind::Str(string, ast::StrStyle::Raw(n)) => { |
| Token::Literal(token::Lit::StrRaw(string, n), None) |
| } |
| LitKind::ByteStr(ref bytes) => { |
| let string = bytes.iter().cloned().flat_map(ascii::escape_default) |
| .map(Into::<char>::into).collect::<String>(); |
| Token::Literal(token::Lit::ByteStr(Symbol::intern(&string)), None) |
| } |
| LitKind::Byte(byte) => { |
| let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect(); |
| Token::Literal(token::Lit::Byte(Symbol::intern(&string)), None) |
| } |
| LitKind::Char(ch) => { |
| let string: String = ch.escape_default().map(Into::<char>::into).collect(); |
| Token::Literal(token::Lit::Char(Symbol::intern(&string)), None) |
| } |
| LitKind::Int(n, ty) => { |
| let suffix = match ty { |
| ast::LitIntType::Unsigned(ty) => Some(Symbol::intern(ty.ty_to_string())), |
| ast::LitIntType::Signed(ty) => Some(Symbol::intern(ty.ty_to_string())), |
| ast::LitIntType::Unsuffixed => None, |
| }; |
| Token::Literal(token::Lit::Integer(Symbol::intern(&n.to_string())), suffix) |
| } |
| LitKind::Float(symbol, ty) => { |
| Token::Literal(token::Lit::Float(symbol), Some(Symbol::intern(ty.ty_to_string()))) |
| } |
| LitKind::FloatUnsuffixed(symbol) => Token::Literal(token::Lit::Float(symbol), None), |
| LitKind::Bool(value) => Token::Ident(Ident::with_empty_ctxt(Symbol::intern(if value { |
| "true" |
| } else { |
| "false" |
| }))), |
| } |
| } |
| |
| fn from_token(token: Token) -> Option<LitKind> { |
| match token { |
| Token::Ident(ident) if ident.name == "true" => Some(LitKind::Bool(true)), |
| Token::Ident(ident) if ident.name == "false" => Some(LitKind::Bool(false)), |
| Token::Interpolated(ref nt) => match nt.0 { |
| token::NtExpr(ref v) => match v.node { |
| ExprKind::Lit(ref lit) => Some(lit.node.clone()), |
| _ => None, |
| }, |
| _ => None, |
| }, |
| Token::Literal(lit, suf) => { |
| let (suffix_illegal, result) = parse::lit_token(lit, suf, None); |
| if suffix_illegal && suf.is_some() { |
| return None; |
| } |
| result |
| } |
| _ => None, |
| } |
| } |
| } |
| |
| pub trait HasAttrs: Sized { |
| fn attrs(&self) -> &[ast::Attribute]; |
| fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self; |
| } |
| |
| impl<T: HasAttrs> HasAttrs for Spanned<T> { |
| fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() } |
| fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self { |
| respan(self.span, self.node.map_attrs(f)) |
| } |
| } |
| |
| impl HasAttrs for Vec<Attribute> { |
| fn attrs(&self) -> &[Attribute] { |
| self |
| } |
| fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self { |
| f(self) |
| } |
| } |
| |
| impl HasAttrs for ThinVec<Attribute> { |
| fn attrs(&self) -> &[Attribute] { |
| self |
| } |
| fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self { |
| f(self.into()).into() |
| } |
| } |
| |
| impl<T: HasAttrs + 'static> HasAttrs for P<T> { |
| fn attrs(&self) -> &[Attribute] { |
| (**self).attrs() |
| } |
| fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self { |
| self.map(|t| t.map_attrs(f)) |
| } |
| } |
| |
| impl HasAttrs for StmtKind { |
| fn attrs(&self) -> &[Attribute] { |
| match *self { |
| StmtKind::Local(ref local) => local.attrs(), |
| StmtKind::Item(..) => &[], |
| StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(), |
| StmtKind::Mac(ref mac) => { |
| let (_, _, ref attrs) = **mac; |
| attrs.attrs() |
| } |
| } |
| } |
| |
| fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self { |
| match self { |
| StmtKind::Local(local) => StmtKind::Local(local.map_attrs(f)), |
| StmtKind::Item(..) => self, |
| StmtKind::Expr(expr) => StmtKind::Expr(expr.map_attrs(f)), |
| StmtKind::Semi(expr) => StmtKind::Semi(expr.map_attrs(f)), |
| StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, style, attrs)| { |
| (mac, style, attrs.map_attrs(f)) |
| })), |
| } |
| } |
| } |
| |
| impl HasAttrs for Stmt { |
| fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() } |
| fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self { |
| Stmt { id: self.id, node: self.node.map_attrs(f), span: self.span } |
| } |
| } |
| |
| macro_rules! derive_has_attrs { |
| ($($ty:path),*) => { $( |
| impl HasAttrs for $ty { |
| fn attrs(&self) -> &[Attribute] { |
| &self.attrs |
| } |
| |
| fn map_attrs<F>(mut self, f: F) -> Self |
| where F: FnOnce(Vec<Attribute>) -> Vec<Attribute>, |
| { |
| self.attrs = self.attrs.map_attrs(f); |
| self |
| } |
| } |
| )* } |
| } |
| |
| derive_has_attrs! { |
| Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm, |
| ast::Field, ast::FieldPat, ast::Variant_ |
| } |
