Struct syn::File

source · []
pub struct File {
    pub shebang: Option<String>,
    pub attrs: Vec<Attribute>,
    pub items: Vec<Item>,
}
Expand description

A complete file of Rust source code.

This type is available only 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.

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

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

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

This method tests for !=.

Write self to the given TokenStream. Read more

Convert self directly into a TokenStream object. Read more

Convert self directly into a TokenStream object. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty. Read more

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.