mirror of https://github.com/torvalds/linux.git
111 lines
3.1 KiB
Rust
111 lines
3.1 KiB
Rust
// SPDX-License-Identifier: Apache-2.0 OR MIT
|
|
|
|
#[cfg(feature = "parsing")]
|
|
use crate::lookahead;
|
|
|
|
pub use proc_macro2::Ident;
|
|
|
|
#[cfg(feature = "parsing")]
|
|
pub_if_not_doc! {
|
|
#[doc(hidden)]
|
|
#[allow(non_snake_case)]
|
|
pub fn Ident(marker: lookahead::TokenMarker) -> Ident {
|
|
match marker {}
|
|
}
|
|
}
|
|
|
|
macro_rules! ident_from_token {
|
|
($token:ident) => {
|
|
impl From<Token![$token]> for Ident {
|
|
fn from(token: Token![$token]) -> Ident {
|
|
Ident::new(stringify!($token), token.span)
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
ident_from_token!(self);
|
|
ident_from_token!(Self);
|
|
ident_from_token!(super);
|
|
ident_from_token!(crate);
|
|
ident_from_token!(extern);
|
|
|
|
impl From<Token![_]> for Ident {
|
|
fn from(token: Token![_]) -> Ident {
|
|
Ident::new("_", token.span)
|
|
}
|
|
}
|
|
|
|
pub(crate) fn xid_ok(symbol: &str) -> bool {
|
|
let mut chars = symbol.chars();
|
|
let first = chars.next().unwrap();
|
|
if !(first == '_' || first.is_ascii_alphabetic()) {
|
|
return false;
|
|
}
|
|
for ch in chars {
|
|
if !(ch == '_' || ch.is_ascii_alphanumeric()) {
|
|
return false;
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(feature = "parsing")]
|
|
mod parsing {
|
|
use crate::buffer::Cursor;
|
|
use crate::error::Result;
|
|
use crate::parse::{Parse, ParseStream};
|
|
use crate::token::Token;
|
|
use proc_macro2::Ident;
|
|
|
|
fn accept_as_ident(ident: &Ident) -> bool {
|
|
match ident.to_string().as_str() {
|
|
"_" |
|
|
// Based on https://doc.rust-lang.org/1.65.0/reference/keywords.html
|
|
"abstract" | "as" | "async" | "await" | "become" | "box" | "break" |
|
|
"const" | "continue" | "crate" | "do" | "dyn" | "else" | "enum" |
|
|
"extern" | "false" | "final" | "fn" | "for" | "if" | "impl" | "in" |
|
|
"let" | "loop" | "macro" | "match" | "mod" | "move" | "mut" |
|
|
"override" | "priv" | "pub" | "ref" | "return" | "Self" | "self" |
|
|
"static" | "struct" | "super" | "trait" | "true" | "try" | "type" |
|
|
"typeof" | "unsafe" | "unsized" | "use" | "virtual" | "where" |
|
|
"while" | "yield" => false,
|
|
_ => true,
|
|
}
|
|
}
|
|
|
|
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
|
|
impl Parse for Ident {
|
|
fn parse(input: ParseStream) -> Result<Self> {
|
|
input.step(|cursor| {
|
|
if let Some((ident, rest)) = cursor.ident() {
|
|
if accept_as_ident(&ident) {
|
|
Ok((ident, rest))
|
|
} else {
|
|
Err(cursor.error(format_args!(
|
|
"expected identifier, found keyword `{}`",
|
|
ident,
|
|
)))
|
|
}
|
|
} else {
|
|
Err(cursor.error("expected identifier"))
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
impl Token for Ident {
|
|
fn peek(cursor: Cursor) -> bool {
|
|
if let Some((ident, _rest)) = cursor.ident() {
|
|
accept_as_ident(&ident)
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
fn display() -> &'static str {
|
|
"identifier"
|
|
}
|
|
}
|
|
}
|