franta-hg@31: /**
franta-hg@31:  * Rozšířené atributy – program na správu rozšířených atributů souborů
franta-hg@31:  * Copyright © 2023 František Kučera (frantovo.cz)
franta-hg@31:  *
franta-hg@31:  * This program is free software: you can redistribute it and/or modify
franta-hg@31:  * it under the terms of the GNU General Public License as published by
franta-hg@31:  * the Free Software Foundation, either version 3 of the License.
franta-hg@31:  *
franta-hg@31:  * This program is distributed in the hope that it will be useful,
franta-hg@31:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@31:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
franta-hg@31:  * GNU General Public License for more details.
franta-hg@31:  *
franta-hg@31:  * You should have received a copy of the GNU General Public License
franta-hg@31:  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
franta-hg@31:  */
franta-hg@31: package cz.frantovo.rozsireneatributy;
franta-hg@31: 
franta-hg@31: import cz.frantovo.rozsireneatributy.Konfigurace.DefiniceAtributu;
franta-hg@31: import cz.frantovo.rozsireneatributy.Konfigurace.DefiniceHodnoty;
franta-hg@31: import java.io.File;
franta-hg@31: import java.util.Arrays;
franta-hg@31: import java.util.Collection;
franta-hg@31: import java.util.ResourceBundle;
franta-hg@31: 
franta-hg@31: /**
franta-hg@31:  * Converts command line arguments from String array to object. Checks basic
franta-hg@31:  * constraints (if only supported options are used and if they have correct
franta-hg@31:  * number of parameters)
franta-hg@31:  *
franta-hg@31:  * @author Ing. František Kučera (frantovo.cz)
franta-hg@31:  */
franta-hg@31: public class CLIParser {
franta-hg@31: 
franta-hg@31: 	private static final ResourceBundle překlady = ResourceBundle
franta-hg@31: 		.getBundle(Atribut.class.getPackageName() + ".Překlady");
franta-hg@31: 
franta-hg@31: 	public Konfigurace parsujParametry(String[] parametry)
franta-hg@31: 		throws CLIParserException {
franta-hg@31: 		Konfigurace k = new Konfigurace();
franta-hg@31: 
franta-hg@31: 		for (int i = 0; i < parametry.length; i++) {
franta-hg@31: 			String parametr = parametry[i];
franta-hg@31: 
franta-hg@31: 			boolean odpovídá = false;
franta-hg@31: 
franta-hg@31: 			for (Token t : Token.values()) {
franta-hg@31: 				if (t.odpovídá(parametr)) {
franta-hg@31: 					int parsedArgs = t.parsuj(parametry, i, k);
franta-hg@31: 					i = i + parsedArgs;
franta-hg@31: 					odpovídá = true;
franta-hg@31: 				}
franta-hg@31: 			}
franta-hg@31: 
franta-hg@31: 			if (!odpovídá) {
franta-hg@31: 				throw new CLIParserException(
franta-hg@31: 					překlady.getString("chyba.cli.neznámýParametr") + parametr);
franta-hg@31: 			}
franta-hg@31: 		}
franta-hg@31: 
franta-hg@31: 		if (k.getSoubor() == null)
franta-hg@31: 			throw new CLIParserException(
franta-hg@31: 					překlady.getString("chyba.cli.chybíSoubor"));
franta-hg@31: 		
franta-hg@31: 		return k;
franta-hg@31: 	}
franta-hg@31: 
franta-hg@31: 	private static String načtiDalší(String[] parametry, int index)
franta-hg@31: 		throws CLIParserException {
franta-hg@31: 		if (index < parametry.length) {
franta-hg@31: 			return parametry[index];
franta-hg@31: 		} else {
franta-hg@31: 			throw new CLIParserException("Expecting value for option: "
franta-hg@31: 				+ parametry[index - 1]);
franta-hg@31: 		}
franta-hg@31: 	}
franta-hg@31: 
franta-hg@31: 	private static boolean načtiDalšíBoolean(String[] parametry, int index)
franta-hg@31: 		throws CLIParserException {
franta-hg@31: 		String s = načtiDalší(parametry, index);
franta-hg@31: 		switch (s) {
franta-hg@31: 			case "true":
franta-hg@31: 			case "ano":
franta-hg@31: 				return true;
franta-hg@31: 			case "false":
franta-hg@31: 			case "ne":
franta-hg@31: 				return false;
franta-hg@31: 			default:
franta-hg@31: 				throw new CLIParserException("Neplatná logická hodnota: " + s);
franta-hg@31: 		}
franta-hg@31: 	}
franta-hg@31: 
franta-hg@31: 	private static enum Token {
franta-hg@31: 
franta-hg@31: 		SOUBOR("--soubor", "--file") {
franta-hg@31: 			@Override
franta-hg@31: 			public int parsuj(String[] parametry, int index, Konfigurace k)
franta-hg@31: 				throws CLIParserException {
franta-hg@31: 				int originalIndex = index;
franta-hg@31: 				k.setSoubor(new File(načtiDalší(parametry, ++index)));
franta-hg@31: 				return index - originalIndex;
franta-hg@31: 			}
franta-hg@31: 		},
franta-hg@31: 		POVINNÉ_ZAMYKÁNÍ("--povinné-zamykání", "--mandatory-locking") {
franta-hg@31: 			@Override
franta-hg@31: 			public int parsuj(String[] parametry, int index, Konfigurace k)
franta-hg@31: 				throws CLIParserException {
franta-hg@31: 				int originalIndex = index;
franta-hg@31: 				k.setPovinnéZamykání(načtiDalšíBoolean(parametry, ++index));
franta-hg@31: 				return index - originalIndex;
franta-hg@31: 			}
franta-hg@31: 		},
franta-hg@31: 		DEFINICE_ATRIBUTU("--definice-atributu", "--attribute-definition") {
franta-hg@31: 			@Override
franta-hg@31: 			public int parsuj(String[] parametry, int index, Konfigurace k)
franta-hg@31: 				throws CLIParserException {
franta-hg@31: 				int originalIndex = index;
franta-hg@31: 				String název = načtiDalší(parametry, ++index);
franta-hg@31: 				String popis = načtiDalší(parametry, ++index);
franta-hg@31: 				k.addAtribut(new DefiniceAtributu(název, popis));
franta-hg@31: 				return index - originalIndex;
franta-hg@31: 			}
franta-hg@31: 		},
franta-hg@31: 		HODNOTA_ATRIBUTU("--hodnota", "--value") {
franta-hg@31: 			@Override
franta-hg@31: 			public int parsuj(String[] parametry, int index, Konfigurace k)
franta-hg@31: 				throws CLIParserException {
franta-hg@31: 				int originalIndex = index;
franta-hg@31: 				String hodnota = načtiDalší(parametry, ++index);
franta-hg@31: 				String popis = načtiDalší(parametry, ++index);
franta-hg@31: 
franta-hg@31: 				if (k.getAtributy().isEmpty())
franta-hg@31: 					throw new CLIParserException(
franta-hg@31: 						překlady.getString("chyba.cli.chybíDefiniceAtributu"));
franta-hg@31: 
franta-hg@31: 				k.getAtributy()
franta-hg@31: 					.get(k.getAtributy().size() - 1)
franta-hg@31: 					.addHodnota(new DefiniceHodnoty(hodnota, popis));
franta-hg@31: 
franta-hg@31: 				return index - originalIndex;
franta-hg@31: 			}
franta-hg@31: 		};
franta-hg@31: 
franta-hg@31: 		private final Collection<String> parametry;
franta-hg@31: 
franta-hg@31: 		private Token(String... parametry) {
franta-hg@31: 			this.parametry = Arrays.asList(parametry);
franta-hg@31: 		}
franta-hg@31: 
franta-hg@31: 		/**
franta-hg@31: 		 * @param parametr e.g. „--input-file“
franta-hg@31: 		 * @return whether option is this token
franta-hg@31: 		 */
franta-hg@31: 		public boolean odpovídá(String parametr) {
franta-hg@31: 			return parametry.contains(parametr);
franta-hg@31: 		}
franta-hg@31: 
franta-hg@31: 		/**
franta-hg@31: 		 * Parse String arguments and fill values into the options object.
franta-hg@31: 		 *
franta-hg@31: 		 * @param parametry CLI arguments
franta-hg@31: 		 * @param index index of the option matched by this token, like
franta-hg@31: 		 * „--input-file“
franta-hg@31: 		 * @param k object to be filled
franta-hg@31: 		 * @return number of parsed arguments – if option has no arguments (just
franta-hg@31: 		 * boolean flag), return 0, otherwise return positive integer: number of
franta-hg@31: 		 * eaten arguments.
franta-hg@31: 		 * @throws CLIParserException
franta-hg@31: 		 */
franta-hg@31: 		public abstract int parsuj(String[] parametry, int index, Konfigurace k)
franta-hg@31: 			throws CLIParserException;
franta-hg@31: 	}
franta-hg@31: }