Method substitute_concat

src/pre_processor.rs:336–387

(&mut self, span: &mut Span)

    }

    fn substitute_concat(&mut self, span: &mut Span) -> Result<bool, Diagnostic> {
        let Token::Name(macro_name) = get_token(&self.tokens[*self.i]) else {
            return Ok(false);
        };
        let macro_name_span = get_span(&self.tokens[*self.i]);
        if macro_name != "CONCAT" {
            return Ok(false);
        }
        if self
            .tokens
            .get(*self.i + 1)
            .is_none_or(|token| get_token(token) != &Token::LParen)
        {
            return Ok(false);
        }
        if self
            .tokens
            .get(*self.i + 3)
            .is_none_or(|token| get_token(token) != &Token::Comma)
        {
            return Ok(false);
        }
        if self
            .tokens
            .get(*self.i + 5)
            .is_none_or(|token| get_token(token) != &Token::RParen)
        {
            return Ok(false);
        }
        let Some(Token::Name(left)) = self.tokens.get(*self.i + 2).map(get_token).cloned() else {
            return Ok(false);
        };
        let Some(Token::Name(right)) = self.tokens.get(*self.i + 4).map(get_token).cloned() else {
            return Ok(false);
        };
        self.remove_token(span);
        self.remove_token(span);
        self.remove_token(span);
        self.remove_token(span);
        self.remove_token(span);
        self.remove_token(span);
        self.tokens.insert(
            *self.i,
            (
                macro_name_span.start,
                Token::Name(format!("{}{}", left, right).into()),
                macro_name_span.end,
            ),
        );
        span.end += 1;
        Ok(true)
    }
}