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use std::ops::{Index, Range};
use logos::{Logos, Source};
pub fn lex_command_name<'a, T>(lexer: &mut logos::Lexer<'a, T>) -> &'a str
where
T: Logos<'a>,
T::Source: Index<Range<usize>, Output = str>,
{
let start = lexer.span().end;
let input = &lexer.source()[start..lexer.source().len()];
let mut chars = input.chars().peekable();
let Some(c) = chars.next() else {
return "";
};
if c.is_whitespace() {
return "";
}
lexer.bump(c.len_utf8());
if c.is_alphanumeric() || c == '@' {
while let Some(c) = chars.next() {
match c {
'*' => {
lexer.bump(c.len_utf8());
break;
}
c if c.is_alphanumeric() => {
lexer.bump(c.len_utf8());
}
'_' => {
if !matches!(chars.peek(), Some(c) if c.is_alphanumeric()) {
break;
}
lexer.bump(c.len_utf8());
}
'@' | ':' => {
lexer.bump(c.len_utf8());
}
_ => {
break;
}
}
}
}
&lexer.source()[start..lexer.span().end]
}
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