Struct HexStr

pub struct HexStr {
    pub hex_token: hex,
    pub value: LitStr,
}

A hex string.

Fields

hex_token: hex

The prefix of the string.

value: LitStr

The string literal.

Methods from Deref<Target = LitStr>

pub fn value(&self) -> String

pub fn parse<T>(&self) -> Result<T, Error>

where T: Parse,

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>(&self, parser: F) -> Result<<F as Parser>::Output, Error>

where F: Parser,

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 HexStr

fn clone(&self) -> HexStr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HexStr

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Deref for HexStr

type Target = LitStr

The resulting type after dereferencing.

fn deref(&self) -> &<HexStr as Deref>::Target

Dereferences the value.

impl DerefMut for HexStr

fn deref_mut(&mut self) -> &mut <HexStr as Deref>::Target

Mutably dereferences the value.

impl Parse for HexStr

fn parse(input: &ParseBuffer<'_>) -> Result<HexStr, Error>

impl Spanned for HexStr

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.

fn set_span(&mut self, span: Span)

Sets the span of this syntax tree node if it is not empty.

fn with_span(self, span: Span) -> Self

where Self: Sized,

Sets the span of this owned syntax tree node if it is not empty.