Struct syn::Block

source ·
pub struct Block {
    pub brace_token: Brace,
    pub stmts: Vec<Stmt>,
}
Expand description

A braced block containing Rust statements.

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

Fields

brace_token: Bracestmts: Vec<Stmt>

Statements in a block

Implementations

Parse the body of a block as zero or more statements, possibly including one trailing expression.

This function is available if Syn is built with the "parsing" feature.

Example
#[macro_use]
extern crate syn;

use syn::{token, Attribute, Block, Ident, Stmt};
use syn::parse::{Parse, ParseStream, Result};

// Parse a function with no generics or parameter list.
//
//     fn playground {
//         let mut x = 1;
//         x += 1;
//         println!("{}", x);
//     }
struct MiniFunction {
    attrs: Vec<Attribute>,
    fn_token: Token![fn],
    name: Ident,
    brace_token: token::Brace,
    stmts: Vec<Stmt>,
}

impl Parse for MiniFunction {
    fn parse(input: ParseStream) -> Result<Self> {
        let outer_attrs = input.call(Attribute::parse_outer)?;
        let fn_token: Token![fn] = input.parse()?;
        let name: Ident = input.parse()?;

        let content;
        let brace_token = braced!(content in input);
        let inner_attrs = content.call(Attribute::parse_inner)?;
        let stmts = content.call(Block::parse_within)?;

        Ok(MiniFunction {
            attrs: {
                let mut attrs = outer_attrs;
                attrs.extend(inner_attrs);
                attrs
            },
            fn_token: fn_token,
            name: name,
            brace_token: brace_token,
            stmts: stmts,
        })
    }
}

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 !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
Write self to the given TokenStream. 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.