set up basic repl/command structure for ease of testing backend

3 files changed, 132 insertions, 0 deletions

diff --git a/src/main/java/edu/brown/cs/student/term/Main.java b/src/main/java/edu/brown/cs/student/term/Main.java
new file mode 100644
index 0000000..c436b2e
--- /dev/null
+++ b/src/main/java/edu/brown/cs/student/term/Main.java
@@ -0,0 +1,54 @@
+package edu.brown.cs.student.term;
+
+import edu.brown.cs.student.term.repl.Command;
+import edu.brown.cs.student.term.repl.REPL;
+import joptsimple.OptionParser;
+import joptsimple.OptionSet;
+
+import java.util.HashMap;
+
+/**
+ * The Main class of our project. This is where execution begins.
+ *
+ */
+public final class Main {
+
+  private static final int DEFAULT_PORT = 4567;
+
+  /**
+   * The initial method called when execution begins.
+   *
+   * @param args
+   *          An array of command line arguments
+   */
+  public static void main(String[] args) {
+    new Main(args).run();
+  }
+
+  private String[] args;
+
+  private Main(String[] args) {
+    this.args = args;
+  }
+
+  private void run() {
+    // Parse command line arguments
+    OptionParser parser = new OptionParser();
+    parser.accepts("gui");
+    parser.accepts("port").withRequiredArg().ofType(Integer.class)
+    .defaultsTo(DEFAULT_PORT);
+    OptionSet options = parser.parse(args);
+
+    if (options.has("gui")) {
+      //do a gui type thing
+      //runSparkServer((int) options.valueOf("port"));
+    }
+
+    HashMap<String, Command> commandHashMap = new HashMap<>();
+    /** add commands to map here! */
+    REPL repl = new REPL(commandHashMap);
+    repl.runREPL();
+
+    // TODO: Process commands in a REPL
+  }
+}
\ No newline at end of file
diff --git a/src/main/java/edu/brown/cs/student/term/repl/Command.java b/src/main/java/edu/brown/cs/student/term/repl/Command.java
new file mode 100644
index 0000000..f8b0b04
--- /dev/null
+++ b/src/main/java/edu/brown/cs/student/term/repl/Command.java
@@ -0,0 +1,19 @@
+package edu.brown.cs.student.term.repl;
+
+/**
+ * Interface implemented by all five StarsCommand commands.
+ * Implemented by StarsCommand, NaiveNeighbors, NaiveRadiusCommand, RadiusCommand, NeighborsCommand
+ */
+public interface Command {
+  /**
+   * Main run method for every command.
+   * @param args arguments for the command
+   */
+  String run(String[] args);
+
+  /**
+   * Used to print command output to GUI.
+   * @return    String representing neighbors found by NeighborsCommand and RadiusCommand commands
+   */
+  String toString();
+}
diff --git a/src/main/java/edu/brown/cs/student/term/repl/REPL.java b/src/main/java/edu/brown/cs/student/term/repl/REPL.java
new file mode 100644
index 0000000..0be7e3f
--- /dev/null
+++ b/src/main/java/edu/brown/cs/student/term/repl/REPL.java
@@ -0,0 +1,59 @@
+package edu.brown.cs.student.term.repl;
+import edu.brown.cs.student.term.repl.Command;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * REPL Class maps input to proper class and function for that command.
+ */
+public class REPL {
+
+  private Map<String, Command> commands;
+
+  /**
+   * Constructor for a REPL object.
+   */
+  public REPL(HashMap<String, Command> userCommands) {
+    commands = userCommands;
+  }
+
+  /**
+   * Gets the current map of commands the REPL supports.
+   * @return the command map
+   */
+  public Map<String, Command> getReplCommandMap() {
+    return commands; }
+
+  /**
+   * Reads user input, maps it to the correct command, and continues.
+   */
+  public void runREPL() {
+    BufferedReader commandHandler = new BufferedReader(new InputStreamReader(System.in));
+    try {
+      String command = commandHandler.readLine();
+      while (command != null) {
+        String[] commandPieces = command.split("\\s+(?=([^\"]*\"[^\"]*\")*[^\"]*$)");
+
+        if (commands.containsKey(commandPieces[0])) {
+          Command desiredCommand = commands.get(commandPieces[0]);
+
+          String[] arguments = Arrays.copyOfRange(commandPieces, 1, commandPieces.length);
+
+          desiredCommand.run(arguments);
+        } else {
+          System.out.println("ERROR: Sorry, command not recognized! Please try again.");
+        }
+
+        command = commandHandler.readLine();
+      }
+    } catch (IOException e) {
+      //might wanna change this later
+      System.out.println("ERROR: Could not locate specified file!");
+    }
+  }
+}