1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
package jed;
import java.util.Scanner;
public class jed {
private static Scanner kbIn = new Scanner(System.in);
private static filebuffer file;
public static void main(String args[]) {
String fileName = null;
boolean hasName = true;
try { // checks if the user provided a file name
fileName = args[0];
} catch (IndexOutOfBoundsException e) {
hasName = false;
}
file = new filebuffer(fileName, hasName);
/* Main command prompt */
while (true) {
System.out.print("> ");
String line = kbIn.nextLine();
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)) {
file.changeCurrentLine(Integer.parseInt(cmd) - 1);
} else {
char c = cmd.charAt(0);
switch (c) {
case 'w':
if (cmd.length() > 1) {
String s[] = new String[2];
s = cmd.split(" ");
file.changeName(s[1]);
}
err = file.writeFile();
break;
case 'q': // q quits
return 1;
case 'a': // a appends
file.append(kbIn, false);
break;
case 'A': // A appends after the current line
file.append(kbIn, true);
break;
case 'p': // p prints lines
file.printFile(false);
break;
case 'n': //n prints lines with numbers
file.printFile(true);
break;
case 'c': // c change current line
file.changeLine(kbIn);
break;
case 'd':
file.deleteLine(); // d delete current line
break;
case 'g': // g/expression/ finds user input
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("/");
file.replace(0, file.getFileSize(), s[1], s[2]);
break;
case '<': // <integer, integer> prefix works with d and s/ex/nex/
String t[] = new String[2];
t = cmd.split(">");
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("/");
file.replace(file.getCurrentLine(), file.getCurrentLine() + 1, m[1], m[2]);
break;
case 'o': // o fileName opens a file
file.changeName(cmd.substring(2,cmd.length()));
file.readFile();
break;
case 'h': // help command
help();
break;
case '^': case '-': // previous line command
if ((file.getCurrentLine() - 1) > -1)
file.changeCurrentLine((file.getCurrentLine() - 1));
else
System.out.println("?");
break;
case '+': // Next line command
if ((file.getCurrentLine() + 1) <= file.getFileSize())
file.changeCurrentLine((file.getCurrentLine() + 1));
else
System.out.println("?");
break;
case '$': // Last line command
file.changeCurrentLine(file.getFileSize() - 1);
break;
default:
System.out.println("?");
break;
}
}
if (err == 1) // error in writing the file
System.out.println("Error writing the file");
return 0;
}
private static void help() {
System.out.println("Jed commands:\nq: quits.\nw: writes the file.\nw: filename: writes with inputted name.\no: filename: opens the file.\na: appends user input to the end of the file.\nA: appends user input after the current line.\np: prints the file.\nn: prints the file with line numbers.\nc: deletes and changes the current line.\nd: deletes the current line.\nAny integer: changes to that line number.\ng/expression/: finds and prints the expression.\n%s/expression/newExpression/: replaces an expression with new user input through the whole file.\n<integer, integer>: prefix works with d and s/ex/nex/ for a range of line.\ns/expression/newExpression/: replaces an expression with new user input in the current line.\nh: prints the commands and their description.");
}
/* 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;
}
}
|
