Method is_current_char_func

crates/gitql-parser/src/tokenizer.rs:809–811

(&self, func: fn(char) -> bool)

    }

    fn is_current_char_func(&self, func: fn(char) -> bool) -> bool {
        self.index < self.content_len && func(self.content[self.index])
    }

    fn has_next(&self) -> bool {
        self.index < self.content_len