Struct syn::LitStr

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pub struct LitStr { /* private fields */ }
Expand description

A UTF-8 string literal: "foo".

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impl LitStr

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pub fn new(value: &str, span: Span) -> Self

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pub fn value(&self) -> String

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pub fn parse<T: Parse>(&self) -> Result<T>

Parse a syntax tree node from the content of this string literal.

All spans in the syntax tree will point to the span of this LitStr.

§Example
use syn::{Attribute, Error, Expr, Lit, Meta, Path, Result};

// Parses the path from an attribute that looks like:
//
//     #[path = "a::b::c"]
//
// or returns `None` if the input is some other attribute.
fn get_path(attr: &Attribute) -> Result<Option<Path>> {
    if !attr.path().is_ident("path") {
        return Ok(None);
    }

    if let Meta::NameValue(meta) = &attr.meta {
        if let Expr::Lit(expr) = &meta.value {
            if let Lit::Str(lit_str) = &expr.lit {
                return lit_str.parse().map(Some);
            }
        }
    }

    let message = "expected #[path = \"...\"]";
    Err(Error::new_spanned(attr, message))
}
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pub fn parse_with<F: Parser>(&self, parser: F) -> Result<F::Output>

Invoke parser on the content of this string literal.

All spans in the syntax tree will point to the span of this LitStr.

§Example
let lit_str: LitStr = /* ... */;

// Parse a string literal like "a::b::c" into a Path, not allowing
// generic arguments on any of the path segments.
let basic_path = lit_str.parse_with(syn::Path::parse_mod_style)?;
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pub fn span(&self) -> Span

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pub fn set_span(&mut self, span: Span)

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pub fn suffix(&self) -> &str

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pub fn token(&self) -> Literal

Trait Implementations§

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impl Clone for LitStr

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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 From<LitStr> for Lit

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fn from(e: LitStr) -> Lit

Converts to this type from the input type.
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impl Parse for LitStr

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

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impl ToTokens for LitStr

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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
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impl Token for LitStr

Auto Trait Implementations§

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impl Freeze for LitStr

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impl RefUnwindSafe for LitStr

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impl !Send for LitStr

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impl !Sync for LitStr

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impl Unpin for LitStr

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impl UnwindSafe for LitStr

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.