Struct syn::Block

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

A braced block containing Rust statements.

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§brace_token: Brace§stmts: Vec<Stmt>

Statements in a block

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impl Block

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pub fn parse_within(input: ParseStream<'_>) -> Result<Vec<Stmt>>

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

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

// 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,
            name,
            brace_token,
            stmts,
        })
    }
}

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impl Clone for Block

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Parse for Block

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

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impl ToTokens for Block

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

Write self to the given TokenStream. Read more
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fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more
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fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert self directly into a TokenStream object. Read more

Auto Trait Implementations§

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impl Freeze for Block

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impl RefUnwindSafe for Block

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impl !Send for Block

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impl !Sync for Block

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impl Unpin for Block

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impl UnwindSafe for Block

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> Spanned for T
where T: Spanned + ?Sized,

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fn span(&self) -> Span

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.