Command and Parser

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

@@ -3,7 +3,9 @@
 import static java.util.Objects.requireNonNull;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_AUTHOR;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_DESCRIPTION;
+import static seedu.algobase.logic.parser.CliSyntax.PREFIX_DIFFICULTY;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_NAME;
+import static seedu.algobase.logic.parser.CliSyntax.PREFIX_SOURCE;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_TAG;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_WEBLINK;
 
@@ -26,12 +28,13 @@ public class AddCommand extends Command {
             + PREFIX_DESCRIPTION + "DESCRIPTION "
             + "[" + PREFIX_TAG + "TAG]...\n"
             + "Example: " + COMMAND_WORD + " "
-            + PREFIX_NAME + "John Doe "
-            + PREFIX_AUTHOR + "98765432 "
-            + PREFIX_WEBLINK + "johnd@example.com "
-            + PREFIX_DESCRIPTION + "311, Clementi Ave 2, #02-25 "
-            + PREFIX_TAG + "friends "
-            + PREFIX_TAG + "owesMoney";
+            + PREFIX_NAME + "Sequences "
+            + PREFIX_AUTHOR + "Tung Kam Chuen "
+            + PREFIX_WEBLINK + "https://open.kattis.com/problems/sequences "
+            + PREFIX_DESCRIPTION
+            + "Find the sum of the number of inversions of the 2k sequences, modulo 1000000007 (109+7). "
+            + PREFIX_DIFFICULTY + "3.0 "
+            + PREFIX_SOURCE + "Kattis";
 
     public static final String MESSAGE_SUCCESS = "New Problem added: %1$s";
     public static final String MESSAGE_DUPLICATE_PERSON = "This Problem already exists in the algobase";

src/main/java/seedu/algobase/logic/commands/EditCommand.java

@@ -46,8 +46,8 @@ public class EditCommand extends Command {
             + "[" + PREFIX_DESCRIPTION + "DESCRIPTION] "
             + "[" + PREFIX_TAG + "TAG]...\n"
             + "Example: " + COMMAND_WORD + " 1 "
-            + PREFIX_AUTHOR + "91234567 "
-            + PREFIX_WEBLINK + "johndoe@example.com";
+            + PREFIX_AUTHOR + "Tung Kam Chuen "
+            + PREFIX_WEBLINK + "https://open.kattis.com/problems/sequences";
 
     public static final String MESSAGE_EDIT_PERSON_SUCCESS = "Edited Problem: %1$s";
     public static final String MESSAGE_NOT_EDITED = "At least one field to edit must be provided.";

src/main/java/seedu/algobase/logic/parser/AddCommandParser.java

@@ -10,6 +10,7 @@
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_TAG;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_WEBLINK;
 
+import java.util.HashSet;
 import java.util.Set;
 import java.util.stream.Stream;
 
@@ -38,21 +39,62 @@ public class AddCommandParser implements Parser<AddCommand> {
     public AddCommand parse(String args) throws ParseException {
         ArgumentMultimap argMultimap =
                 ArgumentTokenizer.tokenize(args, PREFIX_NAME, PREFIX_AUTHOR, PREFIX_WEBLINK, PREFIX_DESCRIPTION,
-                        PREFIX_TAG);
+                        PREFIX_TAG, PREFIX_DIFFICULTY, PREFIX_REMARK, PREFIX_SOURCE);
 
-        if (!arePrefixesPresent(argMultimap, PREFIX_NAME, PREFIX_DESCRIPTION, PREFIX_AUTHOR, PREFIX_WEBLINK)
+        if (!arePrefixesPresent(argMultimap, PREFIX_NAME)
                 || !argMultimap.getPreamble().isEmpty()) {
             throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, AddCommand.MESSAGE_USAGE));
         }
-
         Name name = ParserUtil.parseName(argMultimap.getValue(PREFIX_NAME).get());
-        Author author = ParserUtil.parseAuthor(argMultimap.getValue(PREFIX_AUTHOR).get());
-        WebLink webLink = ParserUtil.parseWeblink(argMultimap.getValue(PREFIX_WEBLINK).get());
-        Description description = ParserUtil.parseDescription(argMultimap.getValue(PREFIX_DESCRIPTION).get());
-        Set<Tag> tagList = ParserUtil.parseTags(argMultimap.getAllValues(PREFIX_TAG));
-        Difficulty difficulty = ParserUtil.parseDifficulty(argMultimap.getValue(PREFIX_DIFFICULTY).get());
-        Remark remark = ParserUtil.parseRemark(argMultimap.getValue(PREFIX_REMARK).get());
-        Source source = ParserUtil.parseSource(argMultimap.getValue(PREFIX_SOURCE).get());
+
+        Author author;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            author = ParserUtil.parseAuthor(argMultimap.getValue(PREFIX_AUTHOR).get());
+        } else {
+            author = Author.DEFAULT_AUTHOR;
+        }
+
+        WebLink webLink;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            webLink = ParserUtil.parseWeblink(argMultimap.getValue(PREFIX_WEBLINK).get());
+        } else {
+            webLink = WebLink.DEFAULT_WEBLINK;
+        }
+
+        Description description;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            description = ParserUtil.parseDescription(argMultimap.getValue(PREFIX_DESCRIPTION).get());
+        } else {
+            description = Description.DEFAULT_DESCRIPTION;
+        }
+
+        Set<Tag> tagList;
+        if (arePrefixesPresent(argMultimap, PREFIX_TAG)) {
+            tagList = ParserUtil.parseTags(argMultimap.getAllValues(PREFIX_TAG));
+        } else {
+            tagList = new HashSet<>();
+        }
+
+        Difficulty difficulty;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            difficulty = ParserUtil.parseDifficulty(argMultimap.getValue(PREFIX_DIFFICULTY).get());
+        } else {
+            difficulty = Difficulty.DEFAULT_DIFFICULTY;
+        }
+
+        Remark remark;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            remark = ParserUtil.parseRemark(argMultimap.getValue(PREFIX_REMARK).get());
+        } else {
+            remark = Remark.DEFAULT_REMARK;
+        }
+
+        Source source;
+        if (arePrefixesPresent(argMultimap, PREFIX_AUTHOR)) {
+            source = ParserUtil.parseSource(argMultimap.getValue(PREFIX_SOURCE).get());
+        } else {
+            source = Source.DEFAULT_SOURCE;
+        }
 
         Problem problem = new Problem(name, author, webLink, description, tagList, difficulty, remark, source);
 

src/main/java/seedu/algobase/logic/parser/EditCommandParser.java

@@ -4,7 +4,10 @@
 import static seedu.algobase.commons.core.Messages.MESSAGE_INVALID_COMMAND_FORMAT;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_AUTHOR;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_DESCRIPTION;
+import static seedu.algobase.logic.parser.CliSyntax.PREFIX_DIFFICULTY;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_NAME;
+import static seedu.algobase.logic.parser.CliSyntax.PREFIX_REMARK;
+import static seedu.algobase.logic.parser.CliSyntax.PREFIX_SOURCE;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_TAG;
 import static seedu.algobase.logic.parser.CliSyntax.PREFIX_WEBLINK;
 
@@ -33,7 +36,7 @@ public EditCommand parse(String args) throws ParseException {
         requireNonNull(args);
         ArgumentMultimap argMultimap =
                 ArgumentTokenizer.tokenize(args, PREFIX_NAME, PREFIX_AUTHOR, PREFIX_WEBLINK, PREFIX_DESCRIPTION,
-                        PREFIX_TAG);
+                        PREFIX_TAG, PREFIX_DIFFICULTY, PREFIX_REMARK, PREFIX_SOURCE);
 
         Index index;
 
@@ -58,6 +61,16 @@ public EditCommand parse(String args) throws ParseException {
                     ParserUtil.parseDescription(argMultimap.getValue(PREFIX_DESCRIPTION).get()));
         }
         parseTagsForEdit(argMultimap.getAllValues(PREFIX_TAG)).ifPresent(editProblemDescriptor::setTags);
+        if (argMultimap.getValue(PREFIX_DIFFICULTY).isPresent()) {
+            editProblemDescriptor.setDifficulty(
+                    ParserUtil.parseDifficulty(argMultimap.getValue(PREFIX_DIFFICULTY).get()));
+        }
+        if (argMultimap.getValue(PREFIX_REMARK).isPresent()) {
+            editProblemDescriptor.setRemark(ParserUtil.parseRemark(argMultimap.getValue(PREFIX_REMARK).get()));
+        }
+        if (argMultimap.getValue(PREFIX_SOURCE).isPresent()) {
+            editProblemDescriptor.setSource(ParserUtil.parseSource(argMultimap.getValue(PREFIX_SOURCE).get()));
+        }
 
         if (!editProblemDescriptor.isAnyFieldEdited()) {
             throw new ParseException(EditCommand.MESSAGE_NOT_EDITED);

src/main/java/seedu/algobase/model/problem/Author.java

@@ -12,7 +12,13 @@ public class Author {
 
     public static final String MESSAGE_CONSTRAINTS =
             "Author numbers should only contain numbers, and it should be at least 3 digits long";
-    public static final String VALIDATION_REGEX = "\\d{3,}";
+    public static final Author DEFAULT_AUTHOR = new Author();
+
+    /*
+     * The first character of the author's name must not be a whitespace,
+     * otherwise " " (a blank string) becomes a valid input.
+     */
+    public static final String VALIDATION_REGEX = "[\\p{Alnum}][\\p{Alnum} ]*";
     public final String value;
 
     /**
@@ -26,6 +32,10 @@ public Author(String author) {
         value = author;
     }
 
+    private Author() {
+        value = "";
+    }
+
     /**
      * Returns true if a given string is a valid author number.
      */

src/main/java/seedu/algobase/model/problem/Description.java

@@ -10,6 +10,7 @@
 public class Description {
 
     public static final String MESSAGE_CONSTRAINTS = "Descriptions can take any values, and it should not be blank";
+    public static final Description DEFAULT_DESCRIPTION = new Description();
 
     /*
      * The first character of the description must not be a whitespace,
@@ -30,6 +31,10 @@ public Description(String description) {
         value = description;
     }
 
+    private Description() {
+        value = "";
+    }
+
     /**
      * Returns true if a given string is a valid weblink.
      */

src/main/java/seedu/algobase/model/problem/Difficulty.java

@@ -11,6 +11,7 @@ public class Difficulty {
 
     public static final String MESSAGE_CONSTRAINTS = "Difficulty should be numeric.";
     public static final Difficulty DEFAULT_DIFFICULTY = new Difficulty();
+    public static final String VALIDATION_REGEX = "\\d+.\\d+";
     public final double value;
 
     /**

src/main/java/seedu/algobase/model/problem/Name.java

@@ -13,7 +13,7 @@ public class Name {
             "Names should only contain alphanumeric characters and spaces, and it should not be blank";
 
     /*
-     * The first character of the description must not be a whitespace,
+     * The first character of the name must not be a whitespace,
      * otherwise " " (a blank string) becomes a valid input.
      */
     public static final String VALIDATION_REGEX = "[\\p{Alnum}][\\p{Alnum} ]*";

src/main/java/seedu/algobase/model/problem/WebLink.java

@@ -3,29 +3,19 @@
 import static java.util.Objects.requireNonNull;
 import static seedu.algobase.commons.util.AppUtil.checkArgument;
 
+import java.net.MalformedURLException;
+import java.net.URL;
+
 /**
  * Represents a Problem's weblink in the algobase.
  * Guarantees: immutable; is valid as declared in {@link #isValidWeblink(String)}
  */
 public class WebLink {
 
-    private static final String SPECIAL_CHARACTERS = "!#$%&'*+/=?`{|}~^.-";
-    public static final String MESSAGE_CONSTRAINTS = "Weblinks should be of the format local-part@domain "
-            + "and adhere to the following constraints:\n"
-            + "1. The local-part should only contain alphanumeric characters and these special characters, excluding "
-            + "the parentheses, (" + SPECIAL_CHARACTERS + ") .\n"
-            + "2. This is followed by a '@' and then a domain name. "
-            + "The domain name must:\n"
-            + "    - be at least 2 characters long\n"
-            + "    - start and end with alphanumeric characters\n"
-            + "    - consist of alphanumeric characters, a period or a hyphen for the characters in between, if any.";
-    // alphanumeric and special characters
-    private static final String LOCAL_PART_REGEX = "^[\\w" + SPECIAL_CHARACTERS + "]+";
-    private static final String DOMAIN_FIRST_CHARACTER_REGEX = "[^\\W_]"; // alphanumeric characters except underscore
-    private static final String DOMAIN_MIDDLE_REGEX = "[a-zA-Z0-9.-]*"; // alphanumeric, period and hyphen
-    private static final String DOMAIN_LAST_CHARACTER_REGEX = "[^\\W_]$";
-    public static final String VALIDATION_REGEX = LOCAL_PART_REGEX + "@"
-            + DOMAIN_FIRST_CHARACTER_REGEX + DOMAIN_MIDDLE_REGEX + DOMAIN_LAST_CHARACTER_REGEX;
+    public static final String MESSAGE_CONSTRAINTS = "Weblinks should be parsable by java.net.URL";
+    public static final String VALIDATION_REGEX =
+            "<\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]>";
+    public static final WebLink DEFAULT_WEBLINK = new WebLink();
 
     public final String value;
 
@@ -40,11 +30,20 @@ public WebLink(String weblink) {
         value = weblink;
     }
 
+    private WebLink() {
+        value = "";
+    }
+
     /**
      * Returns if a given string is a valid weblink.
      */
     public static boolean isValidWeblink(String test) {
-        return test.matches(VALIDATION_REGEX);
+        try {
+            URL url = new URL(test);
+            return true;
+        } catch (MalformedURLException e) {
+            return false;
+        }
     }
 
     @Override

src/main/java/seedu/algobase/model/util/SampleDataUtil.java

@@ -22,39 +22,48 @@
 public class SampleDataUtil {
     public static Problem[] getSampleProblems() {
         return new Problem[] {
-            new Problem(new Name("Alex Yeoh"), new Author("87438807"), new WebLink("alexyeoh@example.com"),
-                new Description("Blk 30 Geylang Street 29, #06-40"),
-                    getTagSet("friends"),
+            new Problem(new Name("Sequences"), new Author("Tung Kam Chuen"),
+                    new WebLink("https://open.kattis.com/problems/sequences"),
+                    new Description("Find the sum of the number of inversions of the 2k sequences, "
+                            + "modulo 1000000007(109+7)."),
+                    getTagSet(),
                     Difficulty.DEFAULT_DIFFICULTY,
                     Remark.DEFAULT_REMARK,
-                    Source.DEFAULT_SOURCE),
-            new Problem(new Name("Bernice Yu"), new Author("99272758"), new WebLink("berniceyu@example.com"),
-                new Description("Blk 30 Lorong 3 Serangoon Gardens, #07-18"),
-                    getTagSet("colleagues", "friends"),
-                    Difficulty.DEFAULT_DIFFICULTY,
-                    Remark.DEFAULT_REMARK,
-                    Source.DEFAULT_SOURCE),
-            new Problem(new Name("Charlotte Oliveiro"), new Author("93210283"), new WebLink("charlotte@example.com"),
-                new Description("Blk 11 Ang Mo Kio Street 74, #11-04"),
-                    getTagSet("neighbours"),
-                    Difficulty.DEFAULT_DIFFICULTY,
-                    Remark.DEFAULT_REMARK,
-                    Source.DEFAULT_SOURCE),
-            new Problem(new Name("David Li"), new Author("91031282"), new WebLink("lidavid@example.com"),
-                new Description("Blk 436 Serangoon Gardens Street 26, #16-43"),
-                    getTagSet("family"),
-                    Difficulty.DEFAULT_DIFFICULTY,
-                    Remark.DEFAULT_REMARK,
-                    Source.DEFAULT_SOURCE),
-            new Problem(new Name("Irfan Ibrahim"), new Author("92492021"), new WebLink("irfan@example.com"),
-                new Description("Blk 47 Tampines Street 20, #17-35"),
-                    getTagSet("classmates"),
-                    Difficulty.DEFAULT_DIFFICULTY,
+                    new Source("Kattis")),
+            new Problem(new Name("Two Sum"), Author.DEFAULT_AUTHOR,
+                    new WebLink("https://leetcode.com/problems/two-sum/"),
+                    new Description("Given an array of integers, "
+                            + "return indices of the two numbers such that they add up to a specific target."),
+                    getTagSet("array", "hash table", "algorithm"),
+                    new Difficulty("1.0"),
+                    new Remark("You may assume that each input would have exactly one solution, "
+                            + "and you may not use the same element twice."),
+                    new Source("LeetCode")),
+            new Problem(new Name("Second Highest Salary"), new Author("LeetCode"),
+                    new WebLink("https://leetcode.com/problems/second-highest-salary/"),
+                    new Description("Write a SQL query to get the second highest salary from the Employee table."),
+                    getTagSet("MySQL", "database"),
+                    new Difficulty("2.0"),
                     Remark.DEFAULT_REMARK,
-                    Source.DEFAULT_SOURCE),
-            new Problem(new Name("Roy Balakrishnan"), new Author("92624417"), new WebLink("royb@example.com"),
-                new Description("Blk 45 Aljunied Street 85, #11-31"),
-                    getTagSet("colleagues"),
+                    new Source("LeetCode")),
+            new Problem(new Name("Sudoku Solver"), Author.DEFAULT_AUTHOR,
+                    new WebLink("https://leetcode.com/problems/sudoku-solver/"),
+                    Description.DEFAULT_DESCRIPTION,
+                    getTagSet("hash table", "backtracking", "algorithm"),
+                    new Difficulty("5.0"),
+                    new Remark("You may assume that the given Sudoku puzzle will have a single unique solution."),
+                    new Source("LeetCode")),
+            new Problem(new Name("A. Dawid and Bags of Candies"), Author.DEFAULT_AUTHOR,
+                    new WebLink("https://codeforces.com/problemset/problem/1230/A"),
+                    Description.DEFAULT_DESCRIPTION,
+                    getTagSet("brute force"),
+                    new Difficulty("4.0"),
+                    new Remark("time limit per test1 second\n" + "memory limit per test256 megabytes"),
+                    new Source("CodeForce")),
+            new Problem(new Name("Factorial"), new Author("Wee Han"), WebLink.DEFAULT_WEBLINK,
+                    new Description("define a function factorial that takes in a number n "
+                            + "and returns the factorial of the number."),
+                    getTagSet("recursion"),
                     Difficulty.DEFAULT_DIFFICULTY,
                     Remark.DEFAULT_REMARK,
                     Source.DEFAULT_SOURCE)