Method exec

std/src/strings.rs:181–208

(&self, scope: Scope<'_>)

    }

    fn exec(&self, scope: Scope<'_>) -> CallResult<()> {
        debug_assert_eq!(1, scope.nargs());
        let s = scope.get_string(0);

        let mut chars = s.chars();
        let ch = match chars.next() {
            Some(ch) => ch,
            None => {
                return Err(CallError::Syntax(
                    scope.get_pos(0),
                    format!("Input string \"{}\" must be 1-character long", s),
                ));
            }
        };
        if chars.next().is_some() {
            return Err(CallError::Syntax(
                scope.get_pos(0),
                format!("Input string \"{}\" must be 1-character long", s),
            ));
        }
        let ch = if cfg!(debug_assertions) {
            i32::try_from(ch as u32).expect("Unicode code points end at U+10FFFF")
        } else {
            ch as i32
        };

        scope.return_integer(ch)
    }
}

/// The `CHR` function.