rust/src/libsyntax/lib.rs

// Copyright 2012-2013 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.

//! The Rust parser and macro expander.
//!
//! # Note
//!
//! This API is completely unstable and subject to change.

#![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/",
       test(attr(deny(warnings))))]
#![deny(warnings)]

#![feature(unicode)]
#![feature(rustc_diagnostic_macros)]
#![feature(non_exhaustive)]
#![feature(const_atomic_usize_new)]
#![feature(rustc_attrs)]

// See librustc_cratesio_shim/Cargo.toml for a comment explaining this.
#[allow(unused_extern_crates)]
extern crate rustc_cratesio_shim;

#[macro_use] extern crate bitflags;
extern crate serialize;
#[macro_use] extern crate log;
extern crate std_unicode;
pub extern crate rustc_errors as errors;
extern crate syntax_pos;
extern crate rustc_data_structures;
#[macro_use] extern crate scoped_tls;

extern crate serialize as rustc_serialize; // used by deriving

use rustc_data_structures::sync::Lock;

// A variant of 'try!' that panics on an Err. This is used as a crutch on the
// way towards a non-panic!-prone parser. It should be used for fatal parsing
// errors; eventually we plan to convert all code using panictry to just use
// normal try.
// Exported for syntax_ext, not meant for general use.
#[macro_export]
macro_rules! panictry {
    ($e:expr) => ({
        use std::result::Result::{Ok, Err};
        use errors::FatalError;
        match $e {
            Ok(e) => e,
            Err(mut e) => {
                e.emit();
                FatalError.raise()
            }
        }
    })
}

#[macro_export]
macro_rules! unwrap_or {
    ($opt:expr, $default:expr) => {
        match $opt {
            Some(x) => x,
            None => $default,
        }
    }
}

struct Globals {
    used_attrs: Lock<Vec<u64>>,
    known_attrs: Lock<Vec<u64>>,
    syntax_pos_globals: syntax_pos::Globals,
}

impl Globals {
    fn new() -> Globals {
        Globals {
            used_attrs: Lock::new(Vec::new()),
            known_attrs: Lock::new(Vec::new()),
            syntax_pos_globals: syntax_pos::Globals::new(),
        }
    }
}

pub fn with_globals<F, R>(f: F) -> R
    where F: FnOnce() -> R
{
    let globals = Globals::new();
    GLOBALS.set(&globals, || {
        syntax_pos::GLOBALS.set(&globals.syntax_pos_globals, f)
    })
}

scoped_thread_local!(static GLOBALS: Globals);

#[macro_use]
pub mod diagnostics {
    #[macro_use]
    pub mod macros;
    pub mod plugin;
    pub mod metadata;
}

// NB: This module needs to be declared first so diagnostics are
// registered before they are used.
pub mod diagnostic_list;

pub mod util {
    pub mod lev_distance;
    pub mod node_count;
    pub mod parser;
    #[cfg(test)]
    pub mod parser_testing;
    pub mod small_vector;
    pub mod move_map;

    mod thin_vec;
    pub use self::thin_vec::ThinVec;

    mod rc_slice;
    pub use self::rc_slice::RcSlice;
}

pub mod json;

pub mod syntax {
    pub use ext;
    pub use parse;
    pub use ast;
}

pub mod abi;
pub mod ast;
pub mod attr;
pub mod codemap;
#[macro_use]
pub mod config;
pub mod entry;
pub mod edition;
pub mod feature_gate;
pub mod fold;
pub mod parse;
pub mod ptr;
pub mod show_span;
pub mod std_inject;
pub mod str;
pub use syntax_pos::symbol;
pub mod test;
pub mod tokenstream;
pub mod visit;

pub mod print {
    pub mod pp;
    pub mod pprust;
}

pub mod ext {
    pub use syntax_pos::hygiene;
    pub mod base;
    pub mod build;
    pub mod derive;
    pub mod expand;
    pub mod placeholders;
    pub mod quote;
    pub mod source_util;

    pub mod tt {
        pub mod transcribe;
        pub mod macro_parser;
        pub mod macro_rules;
        pub mod quoted;
    }
}

#[cfg(test)]
mod test_snippet;

__build_diagnostic_array! { libsyntax, DIAGNOSTICS }