InputParser.java

package calculator.parser;

import calculator.global.DefaultDelimiter;

import java.util.Arrays;

public class InputParser {

    private static final InputParser INSTANCE = new InputParser();
    private final Delimiter delimiter;

    private InputParser() {
        this.delimiter = Delimiter.getInstance();
    }

    public static InputParser getInstance() {
        return INSTANCE;
    }

    public String[] parse(String input) {
        String customDelimiter = delimiter.extractDelimiter(input);
        if (!delimiter.validateHasDefaultOrCustomDelimiter(input, customDelimiter)) {
            throw new IllegalArgumentException("허용되지 않는 입력문입니다.");
        }
        String defaultSyntax = delimiter.removeDelimiterSyntax(input);
        return extractNumbersFromDefaultSyntax(defaultSyntax, customDelimiter);
    }

    private String[] extractNumbersFromDefaultSyntax(String defaultSyntax, String customDelimiter) {
        String delimiters = DefaultDelimiter.COMMA.getKey() + DefaultDelimiter.COLON.getKey() + customDelimiter;
        String[] numbers = defaultSyntax.split("[" + delimiters + "]");

        return Arrays.stream(numbers)
                .filter(num -> !num.isEmpty())
                .toArray(String[]::new);
    }
}