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Java zavádza string templates od johny - Skúšobne som si vytvoril CLR procesor pre farebný...

Skúšobne som si vytvoril CLR procesor pre farebný výpis na konzole. Syntax sa ale v blízkej budúcnosti pravdepodobne môže zmeniť.

import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;

enum Ansi {
    RESET("\u001B[0m"),
    RED("\u001B[31m"),
    GREEN("\u001B[32m"),
    YELLOW("\u001B[33m"),
    BLUE("\u001B[34m"),
    WHITE("\u001B[37m"),
    DEFAULT("\u001B[39m");

    private final String code;

    Ansi(String code) {
        this.code = code;
    }

    public String c() {
        return code;
    }

    public static boolean contains(String val) {
        return Arrays.stream(Ansi.values()).anyMatch(n -> n.name().equalsIgnoreCase(val));
    }

}

void main() {

    System.out.println(Ansi.RED);

    String name = "John Doe";

    System.out.println(STR."\{Ansi.BLUE.c()}an old falcon \{Ansi.RESET.c()}");
    System.out.println(CLR."RED Hello \{name}!");
    System.out.println(CLR."GREEN Hi \{name}!");
    System.out.println(CLR."YELLOW Halo \{name}!");
    System.out.println(CLR."BLUE Ahoj \{name}!");
    System.out.println(CLR."GREEN Ahoj \{name}!");
    System.out.println(CLR."BLUE Ahoj ako sa mas \{name}?");
    System.out.println(CLR."BLUEs ? 21 d");
    System.out.println(CLR."");
    System.out.println(CLR." ");
}

StringTemplate.Processor<String, RuntimeException> CLR = temp -> {

    List<String> fragments = new ArrayList<>(temp.fragments());

    String first = fragments.getFirst();
    String[] els = first.split(" ", 2);

    if (els.length != 2) {
        return StringTemplate.interpolate(temp.fragments(), temp.values());
    }

    Ansi val = Ansi.DEFAULT;
    String col = els[0];
    String msg = els[1];

    if (!Ansi.contains(col)) {
        return StringTemplate.interpolate(temp.fragments(), temp.values());
    } else {

        val = Ansi.valueOf(col);

        String res = switch (val) {
            // case null -> Ansi.DEFAULT.c();
            case Ansi.RED -> Ansi.RED.c();
            case Ansi.GREEN -> Ansi.GREEN.c();
            case Ansi.YELLOW -> Ansi.YELLOW.c();
            case Ansi.BLUE -> Ansi.BLUE.c();
            default -> Ansi.DEFAULT.c();
        };

        fragments.removeFirst();
        fragments.addFirst(res + msg);

        String last = fragments.removeLast();
        fragments.addLast(last + Ansi.RESET.c());
        return StringTemplate.interpolate(fragments, temp.values());
    }
};