Struct syn::File

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

Available on crate feature full only.

A complete file of Rust source code.

Typically File objects are created with parse_file.

Example

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

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");
            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");

    // Debug impl is available if Syn is built with "extra-traits" feature.
    println!("{:#?}", syntax);
}

Running with its own source code as input, this program prints output that begins with:

File {
    shebang: None,
    attrs: [],
    items: [
        Use(
            ItemUse {
                attrs: [],
                vis: Inherited,
                use_token: Use,
                leading_colon: None,
                tree: Path(
                    UsePath {
                        ident: Ident(
                            std,
                        ),
                        colon2_token: Colon2,
                        tree: Name(
                            UseName {
                                ident: Ident(
                                    env,
                                ),
                            },
                        ),
                    },
                ),
                semi_token: Semi,
            },
        ),
...

Fields

shebang: Option<String>

attrs: Vec<Attribute>

items: Vec<Item>

Trait Implementations

impl Clone for File

Available on crate feature clone-impls only.

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for File

Available on crate feature extra-traits only.

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for File

Available on crate feature extra-traits only.

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Parse for File

Available on crate feature parsing only.

fn parse(input: ParseStream<'_>) -> Result<Self>

impl PartialEq for File

Available on crate feature extra-traits only.

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ToTokens for File

Available on crate feature printing only.

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl Eq for File

Available on crate feature extra-traits only.