Function consume_conditional_token_or_errors

crates/gitql-parser/src/parser.rs:3987–4002

(
    tokens: &'a [Token],
    position: &'a mut usize,
    condition: fn(&Token) -> bool,
    message: &'a str,
)

#[inline(always)]
pub(crate) fn consume_conditional_token_or_errors<'a>(
    tokens: &'a [Token],
    position: &'a mut usize,
    condition: fn(&Token) -> bool,
    message: &'a str,
) -> Result<&'a Token, Box<Diagnostic>> {
    if *position < tokens.len() && condition(&tokens[*position]) {
        *position += 1;
        let index = *position - 1;
        return Ok(&tokens[index]);
    }

    Err(Diagnostic::error(message)
        .with_location(calculate_safe_location(tokens, *position))
        .as_boxed())
}

#[inline(always)]
pub(crate) fn calculate_safe_location(tokens: &[Token], position: usize) -> SourceLocation {