Refactor parser

build.gradle

@@ -57,6 +57,7 @@ dependencies {
     implementation group: 'org.openjfx', name: 'javafx-graphics', version: javaFxVersion, classifier: 'mac'
     implementation group: 'org.openjfx', name: 'javafx-graphics', version: javaFxVersion, classifier: 'linux'
 
+    implementation group: 'commons-cli', name: 'commons-cli', version: '1.4'
     implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.7.0'
     implementation group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version: '2.7.4'
 

src/main/java/seedu/address/logic/LogicManager.java

@@ -10,7 +10,7 @@
 import seedu.address.logic.commands.Command;
 import seedu.address.logic.commands.CommandResult;
 import seedu.address.logic.commands.exceptions.CommandException;
-import seedu.address.logic.parser.AddressBookParser;
+import seedu.address.logic.parser.McGymmyParser;
 import seedu.address.logic.parser.exceptions.ParseException;
 import seedu.address.model.Model;
 import seedu.address.model.ReadOnlyAddressBook;
@@ -26,23 +26,23 @@ public class LogicManager implements Logic {
 
     private final Model model;
     private final Storage storage;
-    private final AddressBookParser addressBookParser;
+    private final McGymmyParser mcGymmyParser;
 
     /**
      * Constructs a {@code LogicManager} with the given {@code Model} and {@code Storage}.
      */
     public LogicManager(Model model, Storage storage) {
         this.model = model;
         this.storage = storage;
-        addressBookParser = new AddressBookParser();
+        mcGymmyParser = new McGymmyParser();
     }
 
     @Override
     public CommandResult execute(String commandText) throws CommandException, ParseException {
         logger.info("----------------[USER COMMAND][" + commandText + "]");
 
         CommandResult commandResult;
-        Command command = addressBookParser.parseCommand(commandText);
+        Command command = mcGymmyParser.parse(commandText);
         commandResult = command.execute(model);
 
         try {

src/main/java/seedu/address/logic/commands/AddCommand.java

@@ -1,54 +1,57 @@
 package seedu.address.logic.commands;
 
 import static java.util.Objects.requireNonNull;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_ADDRESS;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_EMAIL;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_NAME;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_PHONE;
-import static seedu.address.logic.parser.CliSyntax.PREFIX_TAG;
+
+import java.util.HashSet;
 
 import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.logic.parser.ParserUtil;
+import seedu.address.logic.parser.parameter.Parameter;
 import seedu.address.model.Model;
+import seedu.address.model.person.Address;
+import seedu.address.model.person.Email;
+import seedu.address.model.person.Name;
 import seedu.address.model.person.Person;
+import seedu.address.model.person.Phone;
 
 /**
  * Adds a person to the address book.
  */
 public class AddCommand extends Command {
-
     public static final String COMMAND_WORD = "add";
 
-    public static final String MESSAGE_USAGE = COMMAND_WORD + ": Adds a person to the address book. "
-            + "Parameters: "
-            + PREFIX_NAME + "NAME "
-            + PREFIX_PHONE + "PHONE "
-            + PREFIX_EMAIL + "EMAIL "
-            + PREFIX_ADDRESS + "ADDRESS "
-            + "[" + PREFIX_TAG + "TAG]...\n"
-            + "Example: " + COMMAND_WORD + " "
-            + PREFIX_NAME + "John Doe "
-            + PREFIX_PHONE + "98765432 "
-            + PREFIX_EMAIL + "johnd@example.com "
-            + PREFIX_ADDRESS + "311, Clementi Ave 2, #02-25 "
-            + PREFIX_TAG + "friends "
-            + PREFIX_TAG + "owesMoney";
-
     public static final String MESSAGE_SUCCESS = "New person added: %1$s";
     public static final String MESSAGE_DUPLICATE_PERSON = "This person already exists in the address book";
 
-    private final Person toAdd;
-
-    /**
-     * Creates an AddCommand to add the specified {@code Person}
-     */
-    public AddCommand(Person person) {
-        requireNonNull(person);
-        toAdd = person;
-    }
+    private final Parameter<Name> nameParameter = this.addParameter(
+        "name",
+        "n",
+        "Name of person to add",
+        "John Doe",
+        ParserUtil::parseName
+    );
+    private final Parameter<Phone> phoneParameter = this.addParameter(
+        "phone",
+        "p",
+        "Phone number of person to add",
+        "98765432",
+        ParserUtil::parsePhone
+    );
+    private final Parameter<Email> emailParameter = this.addParameter(
+        "email",
+        "e",
+        "Email address of person to add",
+        "johnd@example.com",
+        ParserUtil::parseEmail
+
+    );
 
     @Override
     public CommandResult execute(Model model) throws CommandException {
         requireNonNull(model);
+        // rewriting this class as an example, address and tags not implemented.
+        Person toAdd = new Person(nameParameter.consume(), phoneParameter.consume(), emailParameter.consume(),
+            new Address("dummy value"), new HashSet<>());
 
         if (model.hasPerson(toAdd)) {
             throw new CommandException(MESSAGE_DUPLICATE_PERSON);
@@ -57,11 +60,4 @@ public CommandResult execute(Model model) throws CommandException {
         model.addPerson(toAdd);
         return new CommandResult(String.format(MESSAGE_SUCCESS, toAdd));
     }
-
-    @Override
-    public boolean equals(Object other) {
-        return other == this // short circuit if same object
-                || (other instanceof AddCommand // instanceof handles nulls
-                && toAdd.equals(((AddCommand) other).toAdd));
-    }
 }

src/main/java/seedu/address/logic/commands/Command.java

@@ -1,12 +1,23 @@
 package seedu.address.logic.commands;
 
 import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.logic.parser.exceptions.ParameterConflictException;
+import seedu.address.logic.parser.parameter.AbstractParameter;
+import seedu.address.logic.parser.parameter.OptionalParameter;
+import seedu.address.logic.parser.parameter.Parameter;
+import seedu.address.logic.parser.parameter.ParameterConverter;
+import seedu.address.logic.parser.parameter.ParameterSet;
 import seedu.address.model.Model;
 
 /**
  * Represents a command with hidden internal logic and the ability to be executed.
  */
 public abstract class Command {
+    private final ParameterSet parameterSet;
+
+    protected Command() {
+        this.parameterSet = new ParameterSet();
+    }
 
     /**
      * Executes the command and returns the result message.
@@ -17,4 +28,79 @@ public abstract class Command {
      */
     public abstract CommandResult execute(Model model) throws CommandException;
 
+    /**
+     * Registers a parameter for use in the parameter set.
+     * Only registered parameters will be used in parsing.
+     * @param parameter parameter to be registered.
+     */
+    protected void registerParameter(AbstractParameter parameter) {
+        try {
+            this.parameterSet.addParameter(parameter);
+        } catch (ParameterConflictException e) {
+            // Commands can only be created by the developers so any parameter conflicts
+            // should not happen, and should fail here during testing.
+            assert false : e.getMessage();
+        }
+    }
+
+    /**
+     * Creates a new required parameter for this command. Also registers it for parsing in the parameter set,
+     * i.e. will be used in the parser.
+     * @param name Name of the parameter.
+     * @param flag flag used in the command, e.g. '-c' in 'add banana -c 100'
+     * @param description short description of what the parameter represents, e.g. 'carbs as an integer'
+     * @param example example value, e.g. '100'
+     * @param converter Function to parse the value from a String to T. May throw a ParseError.
+     */
+    protected <T> Parameter<T> addParameter(String name, String flag, String description,
+                                            String example, ParameterConverter<T> converter) {
+        Parameter<T> parameter = new Parameter<>(name, flag, description, example, converter);
+        this.registerParameter(parameter);
+        return parameter;
+    }
+
+    /**
+     * Creates a new required parameter for this command. Parameter will contain the raw input from the user.
+     * Also registers it for parsing in the parameter set, i.e. will be used in the parser.
+     * @param name Name of the parameter.
+     * @param flag flag used in the command, e.g. '-c' in 'add banana -c 100'
+     * @param description short description of what the parameter represents, e.g. 'carbs as an integer'
+     * @param example example value, e.g. '100'
+     */
+    protected Parameter<String> addParameter(String name, String flag, String description, String example) {
+        return this.addParameter(name, flag, description, example, (s) -> s);
+    }
+
+    /**
+     * Creates a new optional parameter for this command. Also registers it for parsing in the parameter set,
+     * i.e. will be used in the parser.
+     * @param name Name of the parameter.
+     * @param flag flag used in the command, e.g. '-c' in 'add banana -c 100'
+     * @param description short description of what the parameter represents, e.g. 'carbs as an integer'
+     * @param example example value, e.g. '100'
+     * @param converter Function to parse the value from a String to T. May throw a ParseError.
+     */
+    protected <T> OptionalParameter<T> addOptionalParameter(String name, String flag, String description,
+                                                            String example, ParameterConverter<T> converter) {
+        OptionalParameter<T> parameter = new OptionalParameter<>(name, flag, description, example, converter);
+        this.registerParameter(parameter);
+        return parameter;
+    }
+
+    /**
+     * Creates a new optional parameter for this command. Parameter will contain the raw input from the user.
+     * Also registers it for parsing in the parameter set, i.e. will be used in the parser.
+     * @param name Name of the parameter.
+     * @param flag flag used in the command, e.g. '-c' in 'add banana -c 100'
+     * @param description short description of what the parameter represents, e.g. 'carbs as an integer'
+     * @param example example value, e.g. '100'
+     */
+    protected OptionalParameter<String> addOptionalParameter(String name, String flag, String description,
+                                                             String example) {
+        return this.addOptionalParameter(name, flag, description, example, (s) -> s);
+    }
+
+    public ParameterSet getParameterSet() {
+        return parameterSet;
+    }
 }

src/main/java/seedu/address/logic/commands/DeleteCommand.java

@@ -7,6 +7,8 @@
 import seedu.address.commons.core.Messages;
 import seedu.address.commons.core.index.Index;
 import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.logic.parser.ParserUtil;
+import seedu.address.logic.parser.parameter.Parameter;
 import seedu.address.model.Model;
 import seedu.address.model.person.Person;
 
@@ -15,25 +17,21 @@
  */
 public class DeleteCommand extends Command {
 
-    public static final String COMMAND_WORD = "delete";
-
-    public static final String MESSAGE_USAGE = COMMAND_WORD
-            + ": Deletes the person identified by the index number used in the displayed person list.\n"
-            + "Parameters: INDEX (must be a positive integer)\n"
-            + "Example: " + COMMAND_WORD + " 1";
-
     public static final String MESSAGE_DELETE_PERSON_SUCCESS = "Deleted Person: %1$s";
 
-    private final Index targetIndex;
-
-    public DeleteCommand(Index targetIndex) {
-        this.targetIndex = targetIndex;
-    }
+    private final Parameter<Index> indexParameter = this.addParameter(
+        "index",
+        "",
+        "index number used in the displayed person list.",
+        "2",
+        ParserUtil::parseIndex
+    );
 
     @Override
     public CommandResult execute(Model model) throws CommandException {
         requireNonNull(model);
         List<Person> lastShownList = model.getFilteredPersonList();
+        Index targetIndex = indexParameter.consume();
 
         if (targetIndex.getZeroBased() >= lastShownList.size()) {
             throw new CommandException(Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
@@ -43,11 +41,4 @@ public CommandResult execute(Model model) throws CommandException {
         model.deletePerson(personToDelete);
         return new CommandResult(String.format(MESSAGE_DELETE_PERSON_SUCCESS, personToDelete));
     }
-
-    @Override
-    public boolean equals(Object other) {
-        return other == this // short circuit if same object
-                || (other instanceof DeleteCommand // instanceof handles nulls
-                && targetIndex.equals(((DeleteCommand) other).targetIndex)); // state check
-    }
 }