third_party/rust/syn/src/file.rs
author Markus Stange <mstange@themasta.com>
Tue, 02 Oct 2018 01:50:56 +0000
changeset 497549 255e04ebe3bd06b1ecdcea2a5a699ffc7fd9920d
parent 497516 00eb79fc9f8ae1a9ad35de97d3eb5ffe9b1108cc
child 512920 11bcaa1ae0240696119ad1c74709ff3ac5bee3d4
permissions -rw-r--r--
Bug 1457481 - Run mach vendor rust. r=froydnj,erahm Most importantly, this picks up "object" and "goblin" for ELF binary parsing. We only use the ELF code from goblin, so the mach-O parsing code gets eliminated by the linker. Overall, this increases the Android installer size by 20KB. Try pushes for reference: before: https://treeherder.mozilla.org/#/jobs?repo=try&revision=834b56dc5ab3d63a43a32f740ee8212296ac726d&selectedJob=201600899 after: https://treeherder.mozilla.org/#/jobs?repo=try&revision=6983b27e8d3cb715d3b7e6cbd276683f6466e3cc&selectedJob=201600475 installer size: 34524820 -> 34542861 (34.52MB -> 34.54MB) $ mach vendor rust Updating registry `https://github.com/rust-lang/crates.io-index` Adding goblin v0.0.17 Adding memmap v0.6.2 Adding miniz-sys v0.1.10 Adding object v0.10.0 Adding parity-wasm v0.31.3 Adding plain v0.2.3 Adding profiler_helper v0.1.0 (file:///Users/mstange/code/mozilla/tools/profiler/rust-helper) Adding scroll v0.9.1 Adding scroll_derive v0.9.5 Adding syn v0.15.5 Adding thin-vec v0.1.0 Adding uuid v0.6.5 0:30.11 The following files exceed the filesize limit of 102400: third_party/rust/miniz-sys/miniz.c third_party/rust/syn-0.14.6/src/expr.rs third_party/rust/syn-0.14.6/src/gen/fold.rs third_party/rust/syn-0.14.6/src/gen/visit.rs third_party/rust/syn-0.14.6/src/gen/visit_mut.rs The syn dependency is not compiled for goblin, as far as I can tell - it's only needed for the 'syn' feature of scroll_derive, and scroll does not ask for scroll_derive/syn. object -> goblin -> scroll -> scroll_derive -/-> syn But it looks like other versions of syn were already in the tree. Depends on D7021 Differential Revision: https://phabricator.services.mozilla.com/D7023

// Copyright 2018 Syn Developers
//
// 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.

use super::*;

ast_struct! {
    /// A complete file of Rust source code.
    ///
    /// *This type is available if Syn is built with the `"full"` feature.*
    ///
    /// # Example
    ///
    /// Parse a Rust source file into a `syn::File` and print out a debug
    /// representation of the syntax tree.
    ///
    /// ```
    /// # extern crate syn;
    /// #
    /// use std::env;
    /// use std::fs::File;
    /// use std::io::Read;
    /// use std::process;
    ///
    /// fn main() {
    /// # }
    /// #
    /// # fn fake_main() {
    ///     let mut args = env::args();
    ///     let _ = args.next(); // executable name
    ///
    ///     let filename = match (args.next(), args.next()) {
    ///         (Some(filename), None) => filename,
    ///         _ => {
    ///             eprintln!("Usage: dump-syntax path/to/filename.rs");
    ///             process::exit(1);
    ///         }
    ///     };
    ///
    ///     let mut file = File::open(&filename).expect("Unable to open file");
    ///
    ///     let mut src = String::new();
    ///     file.read_to_string(&mut src).expect("Unable to read file");
    ///
    ///     let syntax = syn::parse_file(&src).expect("Unable to parse file");
    ///     println!("{:#?}", syntax);
    /// }
    /// ```
    ///
    /// Running with its own source code as input, this program prints output
    /// that begins with:
    ///
    /// ```text
    /// File {
    ///     shebang: None,
    ///     attrs: [],
    ///     items: [
    ///         ExternCrate(
    ///             ItemExternCrate {
    ///                 attrs: [],
    ///                 vis: Inherited,
    ///                 extern_token: Extern,
    ///                 crate_token: Crate,
    ///                 ident: Ident {
    ///                     term: Term(
    ///                         "syn"
    ///                     ),
    ///                     span: Span
    ///                 },
    ///                 rename: None,
    ///                 semi_token: Semi
    ///             }
    ///         ),
    /// ...
    /// ```
    pub struct File {
        pub shebang: Option<String>,
        pub attrs: Vec<Attribute>,
        pub items: Vec<Item>,
    }
}

#[cfg(feature = "parsing")]
pub mod parsing {
    use super::*;

    use parse::{Parse, ParseStream, Result};

    impl Parse for File {
        fn parse(input: ParseStream) -> Result<Self> {
            Ok(File {
                shebang: None,
                attrs: input.call(Attribute::parse_inner)?,
                items: {
                    let mut items = Vec::new();
                    while !input.is_empty() {
                        items.push(input.parse()?);
                    }
                    items
                },
            })
        }
    }
}

#[cfg(feature = "printing")]
mod printing {
    use super::*;
    use attr::FilterAttrs;
    use proc_macro2::TokenStream;
    use quote::{ToTokens, TokenStreamExt};

    impl ToTokens for File {
        fn to_tokens(&self, tokens: &mut TokenStream) {
            tokens.append_all(self.attrs.inner());
            tokens.append_all(&self.items);
        }
    }
}