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// SPDX-License-Identifier: GPL-2.0
use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{
parse::{
Parse,
ParseStream, //
},
Attribute,
Error,
LitStr,
Result, //
};
/// A string literal that is required to have ASCII value only.
pub(crate) struct AsciiLitStr(LitStr);
impl Parse for AsciiLitStr {
fn parse(input: ParseStream<'_>) -> Result<Self> {
let s: LitStr = input.parse()?;
if !s.value().is_ascii() {
return Err(Error::new_spanned(s, "expected ASCII-only string literal"));
}
Ok(Self(s))
}
}
impl ToTokens for AsciiLitStr {
fn to_tokens(&self, ts: &mut TokenStream) {
self.0.to_tokens(ts);
}
}
impl AsciiLitStr {
pub(crate) fn value(&self) -> String {
self.0.value()
}
}
pub(crate) fn file() -> String {
#[cfg(not(CONFIG_RUSTC_HAS_SPAN_FILE))]
{
proc_macro::Span::call_site()
.source_file()
.path()
.to_string_lossy()
.into_owned()
}
#[cfg(CONFIG_RUSTC_HAS_SPAN_FILE)]
#[allow(clippy::incompatible_msrv)]
{
proc_macro::Span::call_site().file()
}
}
/// Obtain all `#[cfg]` attributes.
pub(crate) fn gather_cfg_attrs(attr: &[Attribute]) -> impl Iterator<Item = &Attribute> + '_ {
attr.iter().filter(|a| a.path().is_ident("cfg"))
}
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