| //! Functions dealing with attributes and meta items |
| |
| mod builtin; |
| |
| pub use builtin::{ |
| cfg_matches, contains_feature_attr, eval_condition, find_crate_name, find_deprecation, |
| find_repr_attrs, find_stability, find_unwind_attr, Deprecation, InlineAttr, OptimizeAttr, |
| IntType, ReprAttr, RustcDeprecation, Stability, StabilityLevel, UnwindAttr, |
| }; |
| pub use IntType::*; |
| pub use ReprAttr::*; |
| pub use StabilityLevel::*; |
| |
| use crate::ast; |
| use crate::ast::{AttrId, Attribute, AttrStyle, Name, Ident, Path, PathSegment}; |
| use crate::ast::{MetaItem, MetaItemKind, NestedMetaItem}; |
| use crate::ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind, GenericParam}; |
| use crate::mut_visit::visit_clobber; |
| use crate::source_map::{BytePos, Spanned, respan, dummy_spanned}; |
| use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration}; |
| use crate::parse::parser::Parser; |
| use crate::parse::{self, ParseSess, PResult}; |
| use crate::parse::token::{self, Token}; |
| use crate::ptr::P; |
| use crate::symbol::{keywords, LocalInternedString, Symbol}; |
| use crate::ThinVec; |
| use crate::tokenstream::{TokenStream, TokenTree, DelimSpan}; |
| use crate::GLOBALS; |
| |
| use log::debug; |
| use syntax_pos::{FileName, Span}; |
| |
| use std::iter; |
| use std::ops::DerefMut; |
| |
| pub fn mark_used(attr: &Attribute) { |
| debug!("Marking {:?} as used.", attr); |
| GLOBALS.with(|globals| { |
| globals.used_attrs.lock().insert(attr.id); |
| }); |
| } |
| |
| pub fn is_used(attr: &Attribute) -> bool { |
| GLOBALS.with(|globals| { |
| globals.used_attrs.lock().contains(attr.id) |
| }) |
| } |
| |
| pub fn mark_known(attr: &Attribute) { |
| debug!("Marking {:?} as known.", attr); |
| GLOBALS.with(|globals| { |
| globals.known_attrs.lock().insert(attr.id); |
| }); |
| } |
| |
| pub fn is_known(attr: &Attribute) -> bool { |
| GLOBALS.with(|globals| { |
| globals.known_attrs.lock().contains(attr.id) |
| }) |
| } |
| |
| pub fn is_known_lint_tool(m_item: Ident) -> bool { |
| ["clippy"].contains(&m_item.as_str().as_ref()) |
| } |
| |
| impl NestedMetaItem { |
| /// Returns the MetaItem if self is a NestedMetaItem::MetaItem. |
| pub fn meta_item(&self) -> Option<&MetaItem> { |
| match *self { |
| NestedMetaItem::MetaItem(ref item) => Some(item), |
| _ => None |
| } |
| } |
| |
| /// Returns the Lit if self is a NestedMetaItem::Literal. |
| pub fn literal(&self) -> Option<&Lit> { |
| match *self { |
| NestedMetaItem::Literal(ref lit) => Some(lit), |
| _ => None |
| } |
| } |
| |
| /// 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)) |
| } |
| |
| /// For a single-segment meta-item returns its name, otherwise returns `None`. |
| pub fn ident(&self) -> Option<Ident> { |
| self.meta_item().and_then(|meta_item| meta_item.ident()) |
| } |
| pub fn name_or_empty(&self) -> LocalInternedString { |
| self.ident().unwrap_or(keywords::Invalid.ident()).name.as_str() |
| } |
| |
| /// 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 { |
| if let Some(ident) = meta_item.ident() { |
| if let Some(lit) = meta_item_list[0].literal() { |
| return Some((ident.name, lit)); |
| } |
| } |
| } |
| 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.meta_item().map_or(false, |meta_item| meta_item.is_word()) |
| } |
| |
| /// 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 { |
| /// Returns `true` if the attribute's path matches the argument. If it matches, then the |
| /// attribute is marked as used. |
| /// |
| /// To check the attribute name without marking it used, use the `path` field directly. |
| pub fn check_name(&self, name: &str) -> bool { |
| let matches = self.path == name; |
| if matches { |
| mark_used(self); |
| } |
| matches |
| } |
| |
| /// For a single-segment attribute returns its name, otherwise returns `None`. |
| pub fn ident(&self) -> Option<Ident> { |
| if self.path.segments.len() == 1 { |
| Some(self.path.segments[0].ident) |
| } else { |
| None |
| } |
| } |
| pub fn name_or_empty(&self) -> LocalInternedString { |
| self.ident().unwrap_or(keywords::Invalid.ident()).name.as_str() |
| } |
| |
| 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.tokens.is_empty() |
| } |
| |
| 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 { |
| /// For a single-segment meta-item returns its name, otherwise returns `None`. |
| pub fn ident(&self) -> Option<Ident> { |
| if self.path.segments.len() == 1 { |
| Some(self.path.segments[0].ident) |
| } else { |
| None |
| } |
| } |
| pub fn name_or_empty(&self) -> LocalInternedString { |
| self.ident().unwrap_or(keywords::Invalid.ident()).name.as_str() |
| } |
| |
| // #[attribute(name = "value")] |
| // ^^^^^^^^^^^^^^ |
| pub fn name_value_literal(&self) -> Option<&Lit> { |
| match &self.node { |
| MetaItemKind::NameValue(v) => Some(v), |
| _ => None, |
| } |
| } |
| |
| 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 check_name(&self, name: &str) -> bool { |
| self.path == 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 { |
| /// Extracts the MetaItem from inside this Attribute. |
| pub fn meta(&self) -> Option<MetaItem> { |
| let mut tokens = self.tokens.trees().peekable(); |
| Some(MetaItem { |
| path: self.path.clone(), |
| 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> { |
| Ok(MetaItem { |
| path: self.path.clone(), |
| node: self.parse(sess, |parser| parser.parse_meta_item_kind())?, |
| span: self.span, |
| }) |
| } |
| |
| /// Converts 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( |
| Ident::from_str("doc"), |
| dummy_spanned(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(ident: Ident, value: Spanned<Symbol>) -> MetaItem { |
| let value = respan(value.span, LitKind::Str(value.node, ast::StrStyle::Cooked)); |
| mk_name_value_item(ident.span.to(value.span), ident, value) |
| } |
| |
| pub fn mk_name_value_item(span: Span, ident: Ident, value: ast::Lit) -> MetaItem { |
| MetaItem { path: Path::from_ident(ident), span, node: MetaItemKind::NameValue(value) } |
| } |
| |
| pub fn mk_list_item(span: Span, ident: Ident, items: Vec<NestedMetaItem>) -> MetaItem { |
| MetaItem { path: Path::from_ident(ident), span, node: MetaItemKind::List(items) } |
| } |
| |
| pub fn mk_word_item(ident: Ident) -> MetaItem { |
| MetaItem { path: Path::from_ident(ident), span: ident.span, node: MetaItemKind::Word } |
| } |
| |
| pub fn mk_nested_word_item(ident: Ident) -> NestedMetaItem { |
| NestedMetaItem::MetaItem(mk_word_item(ident)) |
| } |
| |
| 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: item.path, |
| 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: item.path, |
| 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: Path::from_ident(Ident::from_str("doc").with_span_pos(span)), |
| 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 filter_by_name<'a>(attrs: &'a [Attribute], name: &'a str) |
| -> impl Iterator<Item = &'a Attribute> { |
| attrs.iter().filter(move |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()) |
| } |
| |
| impl MetaItem { |
| fn tokens(&self) -> TokenStream { |
| let mut idents = vec![]; |
| let mut last_pos = BytePos(0 as u32); |
| for (i, segment) in self.path.segments.iter().enumerate() { |
| let is_first = i == 0; |
| if !is_first { |
| let mod_sep_span = Span::new(last_pos, |
| segment.ident.span.lo(), |
| segment.ident.span.ctxt()); |
| idents.push(TokenTree::Token(mod_sep_span, Token::ModSep).into()); |
| } |
| idents.push(TokenTree::Token(segment.ident.span, |
| Token::from_ast_ident(segment.ident)).into()); |
| last_pos = segment.ident.span.hi(); |
| } |
| self.node.tokens(self.span).append_to_tree_and_joint_vec(&mut idents); |
| TokenStream::new(idents) |
| } |
| |
| fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem> |
| where I: Iterator<Item = TokenTree>, |
| { |
| // FIXME: Share code with `parse_path`. |
| let path = match tokens.next() { |
| Some(TokenTree::Token(span, token @ Token::Ident(..))) | |
| Some(TokenTree::Token(span, token @ Token::ModSep)) => 'arm: { |
| let mut segments = if let Token::Ident(ident, _) = token { |
| if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() { |
| tokens.next(); |
| vec![PathSegment::from_ident(ident.with_span_pos(span))] |
| } else { |
| break 'arm Path::from_ident(ident.with_span_pos(span)); |
| } |
| } else { |
| vec![PathSegment::path_root(span)] |
| }; |
| loop { |
| if let Some(TokenTree::Token(span, |
| Token::Ident(ident, _))) = tokens.next() { |
| segments.push(PathSegment::from_ident(ident.with_span_pos(span))); |
| } else { |
| return None; |
| } |
| if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() { |
| tokens.next(); |
| } else { |
| break; |
| } |
| } |
| let span = span.with_hi(segments.last().unwrap().ident.span.hi()); |
| Path { span, segments } |
| } |
| Some(TokenTree::Token(_, Token::Interpolated(nt))) => match *nt { |
| token::Nonterminal::NtIdent(ident, _) => Path::from_ident(ident), |
| token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()), |
| token::Nonterminal::NtPath(ref path) => path.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(path.span.hi()), |
| _ => path.span.hi(), |
| }; |
| let span = path.span.with_hi(hi); |
| Some(MetaItem { path, node, span }) |
| } |
| } |
| |
| impl MetaItemKind { |
| pub fn tokens(&self, span: Span) -> TokenStream { |
| match *self { |
| MetaItemKind::Word => TokenStream::empty(), |
| MetaItemKind::NameValue(ref lit) => { |
| let mut vec = vec![TokenTree::Token(span, Token::Eq).into()]; |
| lit.tokens().append_to_tree_and_joint_vec(&mut vec); |
| TokenStream::new(vec) |
| } |
| 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()); |
| } |
| item.tokens().append_to_tree_and_joint_vec(&mut tokens); |
| } |
| TokenTree::Delimited( |
| DelimSpan::from_single(span), |
| token::Paren, |
| TokenStream::new(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(_, delim, ref tts)) if delim == token::Paren => { |
| tokens.next(); |
| tts.clone() |
| } |
| _ => return Some(MetaItemKind::Word), |
| }; |
| |
| let mut tokens = delimited.into_trees().peekable(); |
| let mut result = Vec::new(); |
| while let Some(..) = tokens.peek() { |
| let item = NestedMetaItem::from_tokens(&mut tokens)?; |
| result.push(item); |
| match tokens.next() { |
| None | Some(TokenTree::Token(_, Token::Comma)) => {} |
| _ => return None, |
| } |
| } |
| Some(MetaItemKind::List(result)) |
| } |
| } |
| |
| impl NestedMetaItem { |
| pub fn span(&self) -> Span { |
| match *self { |
| NestedMetaItem::MetaItem(ref item) => item.span, |
| NestedMetaItem::Literal(ref lit) => lit.span, |
| } |
| } |
| |
| fn tokens(&self) -> TokenStream { |
| match *self { |
| NestedMetaItem::MetaItem(ref item) => item.tokens(), |
| NestedMetaItem::Literal(ref lit) => lit.tokens(), |
| } |
| } |
| |
| fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItem> |
| 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(NestedMetaItem::Literal(respan(span, node))); |
| } |
| } |
| |
| MetaItem::from_tokens(tokens).map(NestedMetaItem::MetaItem) |
| } |
| } |
| |
| impl Lit { |
| crate 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 escaped = string.as_str().escape_default().to_string(); |
| 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" |
| })), false), |
| LitKind::Err(val) => Token::Literal(token::Lit::Err(val), None), |
| } |
| } |
| |
| fn from_token(token: Token) -> Option<LitKind> { |
| match token { |
| Token::Ident(ident, false) if ident.name == "true" => Some(LitKind::Bool(true)), |
| Token::Ident(ident, false) if ident.name == "false" => Some(LitKind::Bool(false)), |
| Token::Interpolated(nt) => match *nt { |
| token::NtExpr(ref v) | token::NtLiteral(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 visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F); |
| } |
| |
| impl<T: HasAttrs> HasAttrs for Spanned<T> { |
| fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() } |
| fn visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F) { |
| self.node.visit_attrs(f); |
| } |
| } |
| |
| impl HasAttrs for Vec<Attribute> { |
| fn attrs(&self) -> &[Attribute] { |
| self |
| } |
| fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| f(self) |
| } |
| } |
| |
| impl HasAttrs for ThinVec<Attribute> { |
| fn attrs(&self) -> &[Attribute] { |
| self |
| } |
| fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| visit_clobber(self, |this| { |
| let mut vec = this.into(); |
| f(&mut vec); |
| vec.into() |
| }); |
| } |
| } |
| |
| impl<T: HasAttrs + 'static> HasAttrs for P<T> { |
| fn attrs(&self) -> &[Attribute] { |
| (**self).attrs() |
| } |
| fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| (**self).visit_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 visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| match self { |
| StmtKind::Local(local) => local.visit_attrs(f), |
| StmtKind::Item(..) => {} |
| StmtKind::Expr(expr) => expr.visit_attrs(f), |
| StmtKind::Semi(expr) => expr.visit_attrs(f), |
| StmtKind::Mac(mac) => { |
| let (_mac, _style, attrs) = mac.deref_mut(); |
| attrs.visit_attrs(f); |
| } |
| } |
| } |
| } |
| |
| impl HasAttrs for Stmt { |
| fn attrs(&self) -> &[ast::Attribute] { |
| self.node.attrs() |
| } |
| |
| fn visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F) { |
| self.node.visit_attrs(f); |
| } |
| } |
| |
| impl HasAttrs for GenericParam { |
| fn attrs(&self) -> &[ast::Attribute] { |
| &self.attrs |
| } |
| |
| fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| self.attrs.visit_attrs(f); |
| } |
| } |
| |
| macro_rules! derive_has_attrs { |
| ($($ty:path),*) => { $( |
| impl HasAttrs for $ty { |
| fn attrs(&self) -> &[Attribute] { |
| &self.attrs |
| } |
| |
| fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) { |
| self.attrs.visit_attrs(f); |
| } |
| } |
| )* } |
| } |
| |
| derive_has_attrs! { |
| Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm, |
| ast::Field, ast::FieldPat, ast::Variant_ |
| } |
| |
| pub fn inject(mut krate: ast::Crate, parse_sess: &ParseSess, attrs: &[String]) -> ast::Crate { |
| for raw_attr in attrs { |
| let mut parser = parse::new_parser_from_source_str( |
| parse_sess, |
| FileName::cli_crate_attr_source_code(&raw_attr), |
| raw_attr.clone(), |
| ); |
| |
| let start_span = parser.span; |
| let (path, tokens) = panictry!(parser.parse_meta_item_unrestricted()); |
| let end_span = parser.span; |
| if parser.token != token::Eof { |
| parse_sess.span_diagnostic |
| .span_err(start_span.to(end_span), "invalid crate attribute"); |
| continue; |
| } |
| |
| krate.attrs.push(Attribute { |
| id: mk_attr_id(), |
| style: AttrStyle::Inner, |
| path, |
| tokens, |
| is_sugared_doc: false, |
| span: start_span.to(end_span), |
| }); |
| } |
| |
| krate |
| } |
