diff options
Diffstat (limited to 'syn/src/ident.rs')
-rw-r--r-- | syn/src/ident.rs | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/syn/src/ident.rs b/syn/src/ident.rs deleted file mode 100644 index 4ca7484..0000000 --- a/syn/src/ident.rs +++ /dev/null @@ -1,101 +0,0 @@ -#[cfg(feature = "parsing")] -use crate::buffer::Cursor; -#[cfg(feature = "parsing")] -use crate::lookahead; -#[cfg(feature = "parsing")] -use crate::parse::{Parse, ParseStream, Result}; -#[cfg(feature = "parsing")] -use crate::token::Token; -use unicode_xid::UnicodeXID; - -pub use proc_macro2::Ident; - -#[cfg(feature = "parsing")] -#[doc(hidden)] -#[allow(non_snake_case)] -pub fn Ident(marker: lookahead::TokenMarker) -> Ident { - match marker {} -} - -#[cfg(feature = "parsing")] -fn accept_as_ident(ident: &Ident) -> bool { - match ident.to_string().as_str() { - "_" | - // Based on https://doc.rust-lang.org/grammar.html#keywords - // and https://github.com/rust-lang/rfcs/blob/master/text/2421-unreservations-2018.md - // and https://github.com/rust-lang/rfcs/blob/master/text/2420-unreserve-proc.md - "abstract" | "as" | "become" | "box" | "break" | "const" | "continue" | - "crate" | "do" | "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" | "type" | "typeof" | "unsafe" | "unsized" | "use" | "virtual" | - "where" | "while" | "yield" => false, - _ => true, - } -} - -#[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) { - return Ok((ident, rest)); - } - } - Err(cursor.error("expected identifier")) - }) - } -} - -#[cfg(feature = "parsing")] -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" - } -} - -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 fn xid_ok(symbol: &str) -> bool { - let mut chars = symbol.chars(); - let first = chars.next().unwrap(); - if !(UnicodeXID::is_xid_start(first) || first == '_') { - return false; - } - for ch in chars { - if !UnicodeXID::is_xid_continue(ch) { - return false; - } - } - true -} |