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Jamal macro library snippet macros
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package javax0.jamal.snippet;


import javax0.jamal.api.Input;
import javax0.jamal.api.Macro;
import javax0.jamal.api.Processor;
import javax0.jamal.tools.InputHandler;

/**
 * Macros defined in static inner classes that change the casing of the input.
 */
public class Case {
    private static String deCapitalize(String s) {
        if (s != null && !s.isEmpty()) {
            return s.substring(0, 1).toLowerCase() + s.substring(1);
        }
        return s;
    }

    static String capitalize(String s) {
        if (s != null && !s.isEmpty()) {
            return s.substring(0, 1).toUpperCase() + s.substring(1);
        }
        return s;
    }

    /**
     * Converts the argument of the macro to all characters lower case.
     */
    public static class Lower implements Macro {
        @Override
        public String evaluate(Input input, Processor processor) {
            InputHandler.skipWhiteSpaces(input);
            return input.toString().trim().toLowerCase();
        }

        @Override
        public String getId() {
            return "case:lower";
        }
    }

    /**
     * Converts the argument of the macro to all characters upper case.
     */
    public static class Upper implements Macro {
        @Override
        public String evaluate(Input input, Processor processor) {
            return input.toString().trim().toUpperCase();
        }
        @Override
        public String getId() {
            return "case:upper";
        }
    }

    /**
     * Capitalizes the input. Changes the first character to upper case.
     */
    public static class Cap implements Macro {
        @Override
        public String evaluate(Input input, Processor processor) {
            return capitalize(input.toString().trim());
        }
        @Override
        public String getId() {
            return "case:cap";
        }

    }

    /**
     * Uncapitalizes the input. Changes the first character to lower case.
     */
    public static class Decap implements Macro {
        @Override
        public String evaluate(Input input, Processor processor) {
            return deCapitalize(input.toString().trim());
        }
        @Override
        public String getId() {
            return "case:decap";
        }
    }
}