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use attr;
use ast;
use codemap::{spanned, Spanned, mk_sp, Span};
use parse::common::*;
use parse::token;
use parse::parser::{Parser, TokenType};
use ptr::P;
pub trait ParserAttr {
fn parse_outer_attributes(&mut self) -> Vec<ast::Attribute>;
fn parse_attribute(&mut self, permit_inner: bool) -> ast::Attribute;
fn parse_inner_attrs_and_next(&mut self)
-> (Vec<ast::Attribute>, Vec<ast::Attribute>);
fn parse_meta_item(&mut self) -> P<ast::MetaItem>;
fn parse_meta_seq(&mut self) -> Vec<P<ast::MetaItem>>;
fn parse_optional_meta(&mut self) -> Vec<P<ast::MetaItem>>;
}
impl<'a> ParserAttr for Parser<'a> {
fn parse_outer_attributes(&mut self) -> Vec<ast::Attribute> {
let mut attrs: Vec<ast::Attribute> = Vec::new();
loop {
debug!("parse_outer_attributes: self.token={:?}",
self.token);
match self.token {
token::Pound => {
attrs.push(self.parse_attribute(false));
}
token::DocComment(s) => {
let attr = ::attr::mk_sugared_doc_attr(
attr::mk_attr_id(),
self.id_to_interned_str(s.ident()),
self.span.lo,
self.span.hi
);
if attr.node.style != ast::AttrOuter {
self.fatal("expected outer comment");
}
attrs.push(attr);
self.bump();
}
_ => break
}
}
return attrs;
}
fn parse_attribute(&mut self, permit_inner: bool) -> ast::Attribute {
debug!("parse_attributes: permit_inner={:?} self.token={:?}",
permit_inner, self.token);
let (span, value, mut style) = match self.token {
token::Pound => {
let lo = self.span.lo;
self.bump();
if permit_inner { self.expected_tokens.push(TokenType::Token(token::Not)); }
let style = if self.token == token::Not {
self.bump();
if !permit_inner {
let span = self.span;
self.span_err(span,
"an inner attribute is not permitted in \
this context");
self.span_help(span,
"place inner attribute at the top of the module or block");
}
ast::AttrInner
} else {
ast::AttrOuter
};
self.expect(&token::OpenDelim(token::Bracket));
let meta_item = self.parse_meta_item();
let hi = self.span.hi;
self.expect(&token::CloseDelim(token::Bracket));
(mk_sp(lo, hi), meta_item, style)
}
_ => {
let token_str = self.this_token_to_string();
self.fatal(&format!("expected `#`, found `{}`", token_str)[]);
}
};
if permit_inner && self.token == token::Semi {
self.bump();
self.span_warn(span, "this inner attribute syntax is deprecated. \
The new syntax is `#![foo]`, with a bang and no semicolon");
style = ast::AttrInner;
}
return Spanned {
span: span,
node: ast::Attribute_ {
id: attr::mk_attr_id(),
style: style,
value: value,
is_sugared_doc: false
}
};
}
fn parse_inner_attrs_and_next(&mut self)
-> (Vec<ast::Attribute> , Vec<ast::Attribute> ) {
let mut inner_attrs: Vec<ast::Attribute> = Vec::new();
let mut next_outer_attrs: Vec<ast::Attribute> = Vec::new();
loop {
let attr = match self.token {
token::Pound => {
self.parse_attribute(true)
}
token::DocComment(s) => {
let Span { lo, hi, .. } = self.span;
self.bump();
attr::mk_sugared_doc_attr(attr::mk_attr_id(),
self.id_to_interned_str(s.ident()),
lo,
hi)
}
_ => {
break;
}
};
if attr.node.style == ast::AttrInner {
inner_attrs.push(attr);
} else {
next_outer_attrs.push(attr);
break;
}
}
(inner_attrs, next_outer_attrs)
}
fn parse_meta_item(&mut self) -> P<ast::MetaItem> {
let nt_meta = match self.token {
token::Interpolated(token::NtMeta(ref e)) => {
Some(e.clone())
}
_ => None
};
match nt_meta {
Some(meta) => {
self.bump();
return meta;
}
None => {}
}
let lo = self.span.lo;
let ident = self.parse_ident();
let name = self.id_to_interned_str(ident);
match self.token {
token::Eq => {
self.bump();
let lit = self.parse_lit();
match lit.node {
ast::LitStr(..) => {}
_ => {
self.span_err(
lit.span,
"non-string literals are not allowed in meta-items");
}
}
let hi = self.span.hi;
P(spanned(lo, hi, ast::MetaNameValue(name, lit)))
}
token::OpenDelim(token::Paren) => {
let inner_items = self.parse_meta_seq();
let hi = self.span.hi;
P(spanned(lo, hi, ast::MetaList(name, inner_items)))
}
_ => {
let hi = self.last_span.hi;
P(spanned(lo, hi, ast::MetaWord(name)))
}
}
}
fn parse_meta_seq(&mut self) -> Vec<P<ast::MetaItem>> {
self.parse_seq(&token::OpenDelim(token::Paren),
&token::CloseDelim(token::Paren),
seq_sep_trailing_allowed(token::Comma),
|p| p.parse_meta_item()).node
}
fn parse_optional_meta(&mut self) -> Vec<P<ast::MetaItem>> {
match self.token {
token::OpenDelim(token::Paren) => self.parse_meta_seq(),
_ => Vec::new()
}
}
}