Struct syn::LitStr

pub struct LitStr { /* private fields */ }

A UTF-8 string literal: "foo".

Implementations

impl LitStr

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

pub fn value(&self) -> String

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))
}

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)?;

pub fn span(&self) -> Span

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

pub fn suffix(&self) -> &str

pub fn token(&self) -> Literal

Trait Implementations

impl Clone for LitStr

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl From<LitStr> for Lit

fn from(e: LitStr) -> Lit

Converts to this type from the input type.

impl Parse for LitStr

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

impl ToTokens for LitStr

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) -> TokenStreamwhere Self: Sized,

Convert self directly into a TokenStream object.

impl Token for LitStr