1 files changed, 80 insertions, 2 deletions

diff --git a/src/jed.java b/src/jed.java
index 7c14070..ddd3718 100644
--- a/src/jed.java
+++ b/src/jed.java
@@ -4,7 +4,7 @@ import java.util.Scanner;
 
 public class jed {
 
-    public static Scanner kbIn = new Scanner(System.in);
+    private static Scanner kbIn = new Scanner(System.in);
     public static filebuffer file;
 
     public static void main(String args[]) {
@@ -20,10 +20,88 @@ public class jed {
 
         while (true) {
             String line = kbIn.nextLine();
-            int err = cmd.parser(line);
+            int err = parser(line);
             if (err == 1)
                 break;
         }
         kbIn.close();
     }
+
+    /* parser: the command parser for jed, takes user input and interprets the command */
+    private static int parser(String cmd) {
+        int err = 0;
+        if (isNum(cmd)) {
+            jed.file.changeCurrentLine(Integer.parseInt(cmd) - 1);
+            System.out.printf("%d %s\n", jed.file.getCurrentLine() + 1, jed.file.getLine(jed.file.getCurrentLine()));
+        } else {
+            char c = cmd.charAt(0);
+            switch (c) {
+                case 'w':
+                    if (cmd.length() > 1) {
+                        String s[] = new String[2];
+                        s = cmd.split(" ");
+                        jed.file.changeName(s[1]);
+                    }
+                    err = jed.file.writeFile();
+                    break;
+                case 'q': // q quits
+                    return 1;
+                case 'a': // a appends
+                    jed.file.append(kbIn);
+                    break;
+                case 'p': // p prints lines
+                    jed.file.printFile(false);
+                    break;
+                case 'n': //n prints lines with numbers
+                    jed.file.printFile(true);
+                    break;
+                case 'c': // c change current line
+                    jed.file.changeLine(kbIn);
+                    break;
+                case 'd':
+                    jed.file.deleteLine(); // d delete current line
+                    break;
+                case 'g': // g/expression/ finds user input
+                    jed.file.find(cmd.substring(2, cmd.length() - 1));
+                    break;
+                case '%': // %s/expression/newExpression/ replaces an expression with new user input through the whole file
+                    String s[] = new String[3];
+                    s = cmd.split("/");
+                    jed.file.replace(0, jed.file.getFileSize(), s[1], s[2]);
+                    break;
+                case '<': // <integer, integer>command works with d and s/ex/nex/
+                    String t[] = new String[2];
+                    t = cmd.split(">");
+                    jed.file.range(t[0], t[1]);
+                    break;
+                case 's': // s/expression/newExpression/ replaces an expression with new user input in the current line
+                    String m[] = new String[3];
+                    m = cmd.split("/");
+                    jed.file.replace(jed.file.getCurrentLine(), jed.file.getCurrentLine() + 1, m[1], m[2]);
+                    break;
+                case 'o':  // o fileName opens a file
+                    jed.file.changeName(cmd.substring(2,cmd.length()));
+                    jed.file.readFile();
+                    break;
+                default:
+                    System.out.println("?");
+                    break;
+            }
+        }
+        if (err == 1) // error in writing the file
+            System.out.println("Error writing the file");
+        return 0;
+    }
+
+    /* isNum: checks if a string is a number, only to be used for changing lines */
+    private static boolean isNum(String s) {
+        try {
+            Integer.parseInt(s);
+        } catch (NumberFormatException e) {
+            return false;
+        } catch (NullPointerException e) {
+            return false;
+        }
+        return true;
+    }
 }
\ No newline at end of file