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#![crate_name = "proc_macro"]
#![stable(feature = "proc_macro_lib", since = "1.15.0")]
#![crate_type = "rlib"]
#![crate_type = "dylib"]
#![deny(warnings)]
#![deny(missing_docs)]
#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
html_root_url = "https://doc.rust-lang.org/nightly/",
html_playground_url = "https://play.rust-lang.org/",
issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
test(no_crate_inject, attr(deny(warnings))),
test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))))]
#![feature(rustc_private)]
#![feature(staged_api)]
#![feature(lang_items)]
extern crate syntax;
use std::fmt;
use std::str::FromStr;
use syntax::errors::DiagnosticBuilder;
use syntax::parse;
use syntax::tokenstream::TokenStream as TokenStream_;
#[stable(feature = "proc_macro_lib", since = "1.15.0")]
pub struct TokenStream {
inner: TokenStream_,
}
#[derive(Debug)]
#[stable(feature = "proc_macro_lib", since = "1.15.0")]
pub struct LexError {
_inner: (),
}
#[unstable(feature = "proc_macro_internals", issue = "27812")]
#[doc(hidden)]
pub mod __internal {
use std::cell::Cell;
use std::rc::Rc;
use syntax::ast;
use syntax::ptr::P;
use syntax::parse::{self, token, ParseSess};
use syntax::tokenstream::{TokenTree, TokenStream as TokenStream_};
use super::{TokenStream, LexError};
pub fn new_token_stream(item: P<ast::Item>) -> TokenStream {
TokenStream {
inner: TokenTree::Token(item.span, token::Interpolated(Rc::new(token::NtItem(item))))
.into()
}
}
pub fn token_stream_wrap(inner: TokenStream_) -> TokenStream {
TokenStream {
inner: inner
}
}
pub fn token_stream_parse_items(stream: TokenStream) -> Result<Vec<P<ast::Item>>, LexError> {
with_parse_sess(move |sess| {
let mut parser = parse::stream_to_parser(sess, stream.inner);
let mut items = Vec::new();
while let Some(item) = try!(parser.parse_item().map_err(super::parse_to_lex_err)) {
items.push(item)
}
Ok(items)
})
}
pub fn token_stream_inner(stream: TokenStream) -> TokenStream_ {
stream.inner
}
pub trait Registry {
fn register_custom_derive(&mut self,
trait_name: &str,
expand: fn(TokenStream) -> TokenStream,
attributes: &[&'static str]);
fn register_attr_proc_macro(&mut self,
name: &str,
expand: fn(TokenStream, TokenStream) -> TokenStream);
fn register_bang_proc_macro(&mut self,
name: &str,
expand: fn(TokenStream) -> TokenStream);
}
thread_local! {
static CURRENT_SESS: Cell<*const ParseSess> = Cell::new(0 as *const _);
}
pub fn set_parse_sess<F, R>(sess: &ParseSess, f: F) -> R
where F: FnOnce() -> R
{
struct Reset { prev: *const ParseSess }
impl Drop for Reset {
fn drop(&mut self) {
CURRENT_SESS.with(|p| p.set(self.prev));
}
}
CURRENT_SESS.with(|p| {
let _reset = Reset { prev: p.get() };
p.set(sess);
f()
})
}
pub fn with_parse_sess<F, R>(f: F) -> R
where F: FnOnce(&ParseSess) -> R
{
let p = CURRENT_SESS.with(|p| p.get());
assert!(!p.is_null(), "proc_macro::__internal::with_parse_sess() called \
before set_parse_sess()!");
f(unsafe { &*p })
}
}
fn parse_to_lex_err(mut err: DiagnosticBuilder) -> LexError {
err.cancel();
LexError { _inner: () }
}
#[stable(feature = "proc_macro_lib", since = "1.15.0")]
impl FromStr for TokenStream {
type Err = LexError;
fn from_str(src: &str) -> Result<TokenStream, LexError> {
__internal::with_parse_sess(|sess| {
let src = src.to_string();
let name = "<proc-macro source code>".to_string();
let stream = parse::parse_stream_from_source_str(name, src, sess);
Ok(__internal::token_stream_wrap(stream))
})
}
}
#[stable(feature = "proc_macro_lib", since = "1.15.0")]
impl fmt::Display for TokenStream {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.inner.fmt(f)
}
}