[][src]Struct syn::File

pub struct File {
    pub shebang: Option<String>,
    pub attrs: Vec<Attribute>,
    pub items: Vec<Item>,

A complete file of Rust source code.

This type is available if Syn is built with the "full" feature.


Parse a Rust source file into a syn::File and print out a debug representation of the syntax tree.

This code runs with edition 2018
use std::env;
use std::fs::File;
use std::io::Read;
use std::process;

fn 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");

    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:

File {
    shebang: None,
    attrs: [],
    items: [
            ItemExternCrate {
                attrs: [],
                vis: Inherited,
                extern_token: Extern,
                crate_token: Crate,
                ident: Ident {
                    term: Term(
                    span: Span
                rename: None,
                semi_token: Semi


shebang: Option<String>attrs: Vec<Attribute>items: Vec<Item>

Trait Implementations

impl Parse for File[src]

impl Clone for File[src]

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl PartialEq<File> for File[src]

impl Eq for File[src]

impl Debug for File[src]

impl Hash for File[src]

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher

Feeds a slice of this type into the given [Hasher]. Read more

impl ToTokens for File[src]

fn into_token_stream(self) -> TokenStream[src]

Convert self directly into a TokenStream object. Read more

Auto Trait Implementations

impl !Sync for File

impl !Send for File

impl Unpin for File

impl !RefUnwindSafe for File

impl UnwindSafe for File

Blanket Implementations

impl<T> Spanned for T where
    T: ToTokens

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

impl<T> Any for T where
    T: 'static + ?Sized