unicode-text.nct

use std/io
use std/string.String

func main(): i32! {
    let decorated: &str = "　ΟΣ　"
    let trimmed = decorated.trim()
    if trimmed != "ΟΣ" || trimmed.char_count() != 2 {
        return 1
    }

    let lowercase = trimmed.to_lowercase()
    let uppercase = "Straße".to_uppercase()
    if (&lowercase as &str) != "ος" || (&uppercase as &str) != "STRASSE" {
        return 2
    }

    let face = char.from_u32(128512) otherwise {
        return 3
    }
    if face != '😀' || face.utf8_len() != 4 || face.is_alphabetic() {
        return 4
    }

    var suffix = String.copy("Aλ😀")
    let removed = suffix.pop() otherwise {
        return 5
    }
    suffix.truncate(1)?
    if removed != '😀' || (&suffix as &str) != "A" {
        return 6
    }

    io.println(&lowercase)?
    io.println(&uppercase)?
    io.println(&suffix)?
    return 0
}