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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);
}
}
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