From 8d37ce9bf25ccd37e50e9f766bb8df710e855217 Mon Sep 17 00:00:00 2001
From: Jacob McDonnell <jacob@simplelittledream.com>
Date: Wed, 8 Dec 2021 21:52:01 -0500
Subject: Rewrote Jed to have multiple classes and cleaned up the code

---
 src/cmd.java | 151 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 src/cmd.java

(limited to 'src/cmd.java')

diff --git a/src/cmd.java b/src/cmd.java
new file mode 100644
index 0000000..d49c589
--- /dev/null
+++ b/src/cmd.java
@@ -0,0 +1,151 @@
+package jed;
+
+public class cmd {
+
+    private static int currentLine = 0;
+
+    /* parser: the command parser for jed, takes user input and interprets the command */
+    public static int parser(String cmd) {
+        int err = 0;
+        if (isNum(cmd)) {
+            currentLine = Integer.parseInt(cmd) - 1;
+            System.out.printf("%d %s\n", currentLine + 1, jed.file.buffer.get(currentLine));
+        } else {
+            char c = cmd.charAt(0);
+            switch (c) {
+                case 'w':
+                    if (cmd.length() > 1) {
+                        String s[] = new String[2];
+                        s = cmd.split(" ");
+                        jed.file.hasName = true;
+                        jed.file.fileName = s[1];
+                    }
+                    err = jed.file.writeFile();
+                    break;
+                case 'q': // q quits
+                    return 1;
+                case 'a': // a appends
+                    append();
+                    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
+                    changeLine();
+                    break;
+                case 'd':
+                    deleteLine(); // d delete current line
+                    break;
+                case 'g': // g/expression/ finds user input
+                    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("/");
+                    replace(0, jed.file.buffer.size(), s[1], s[2]);
+                    break;
+                case '<': // <integer, integer>command works with d and s/ex/nex/
+                    String t[] = new String[2];
+                    t = cmd.split(">");
+                    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("/");
+                    replace(currentLine, currentLine + 1, m[1], m[2]);
+                    break;
+                case 'o':  // o fileName opens a file
+                    jed.file.fileName = cmd.substring(2,cmd.length());
+                    jed.file.hasName = true;
+                    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;
+    }
+
+    /* range: gets the inputed range and runs the command with the range */
+    private static void range(String range, String cmd) {
+        String num[] = new String[2];
+        num = range.replace("<", "").split(",");
+        String temp[] = new String[3];
+        temp = cmd.split("/");
+        int start = Integer.parseInt(num[0]) - 1, stop = Integer.parseInt(num[1]);
+        if (start <= 0 || start-1 >jed.file.buffer.size() || stop <= 0 || stop-1 > jed.file.buffer.size() || stop <= start)
+            System.out.println("?");
+        if (temp[0].equals("s"))
+            replace(start, stop, temp[1], temp[2]);
+        else if (temp[0].equals("d"))
+            deleteLine(start, stop);
+    }
+
+    /* deleteLine: deletes line in the range of start to stop */
+    private static void deleteLine(int start, int stop) {
+        for (int i = start; i < stop;  i++) {
+            jed.file.buffer.remove(start);
+        }
+    }
+
+    /* replace: replaces an expression with new user input */
+    private static void replace(int start, int stop, String ex, String newEx) {
+        for (int i = start; i < stop; i++) {
+            String line = jed.file.buffer.get(i);
+            jed.file.buffer.add(i, line.replace(ex, newEx));
+            jed.file.buffer.remove(i + 1);
+        }
+    }
+
+    /* find: finds user input in the file and prints it with line numbers */
+    private static void find(String expression) {
+        for (int i = 0; i < jed.file.buffer.size(); i++) {
+            String line = jed.file.buffer.get(i);
+            for (int j = 0, k = expression.length(); k < line.length(); j++, k++) {
+                if (line.substring(j, k).equals(expression)) {
+                    System.out.printf("%d %s\n", i + 1, line);
+                    break;
+                }
+            }
+        }
+    }
+
+    /* changeLine: changes the current line */
+    private static void changeLine() {
+        jed.file.buffer.remove(currentLine);
+        String input;
+        int line = currentLine;
+        while (!(input = jed.kbIn.nextLine()).equals("."))
+            jed.file.buffer.add(line++, input);
+    }
+
+    /* deleteLine: deletes the current line */
+    private static void deleteLine() {
+        jed.file.buffer.remove(currentLine);
+    }
+
+    /* 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;
+    }
+
+    /* append: appends user input to the end of a file */
+    private static void append() {
+        String input;
+        while (!(input = jed.kbIn.nextLine()).equals("."))
+            jed.file.buffer.add(input);
+    }
+}
\ No newline at end of file
-- 
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