EditableBufferedReader.java
4.69 KB
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
package pad.prac1;
import java.io.*;
import java.util.Scanner;
import java.util.regex.Pattern;
public class EditableBufferedReader extends BufferedReader
{
/*
* MODE DEFINITIONS
*/
public static final int DEL_BACKWARD = 0;
public static final int DEL_FORWARD = 1;
public static final int INSERT = 0;
public static final int OVERWRITE = 1;
/*
* TYPE DEFINITIONS
*/
public static final int ESCAPE_SEQUENCE = 0;
public static final int PRINTABLE = 1;
public static final int NON_PRINTABLE = 2;
/* KEY DEFINITIONS
*
* ESC (0x1B) starts an escape sequence
* ESC+[+C (0x1B 0x5B 0x43) Cursor Forward
* ESC+[+D (0x1B 0x5B 0x44) Cursor Backward
* ESC+[+2+~ (0x1B 0x5B 0x32 0x7E) Insert
* ESC+[+3+~ (0x1B 0x5B 0x33 0x7E) Delete forward
* ESC+O+H (0x1B 0x4F 0x48) Home
* ESC+O+F (0x1B 0x4F 0x46) End
*/
public static final int RETURN_KEY = 0x0D;
public static final int BACKSPACE = 0x08;
public static final int BACKSPACE_DEL = 0x7F;
public static final int ESC = 0x1B;
public static final int ESC_SEQ = 0x5B;
public static final int FORWARD = 0x43;
public static final int BACKWARD = 0x44;
public static final int GOTO = 0x48;
public static final int DEL = 0x33;
public static final int TILDE = 0x7E;
public static final int HOME_END = 0x4F;
public static final int HOME = 0x48;
public static final int END = 0x46;
public static final int INSERT_KEY = 0x32;
public static final int INS_SPACE = 0x40;
public static final int DEL_CHAR = 0x50;
public static final int EOF = 0x04;
public static final int LINE_FEED = 0x0A;
private Console console = new Console();
private Line line = new Line(console);
private boolean endOfFile = false;
public EditableBufferedReader(Reader in)
{
super(in);
}
public EditableBufferedReader(Reader in, int sz)
{
super(in,sz);
}
private void setRaw() throws IOException, InterruptedException
{
String[] cmd = {"/bin/sh", "-c", "stty raw -echo </dev/tty"};
Runtime.getRuntime().exec(cmd).waitFor();
}
private void unsetRaw() throws IOException, InterruptedException
{
String[] cmd = {"/bin/sh", "-c", "stty -raw echo </dev/tty"};
Runtime.getRuntime().exec(cmd).waitFor();
}
private void parseKey() throws IOException
{
Pattern pattern;
Scanner scanner = new Scanner(System.in);
pattern = Pattern.compile("(.{1})");
if(scanner.findWithinHorizon(pattern,0) != null)
{
int character = (int)scanner.match().group(1).charAt(0);
if(character >= 0x20 || character == EOF || character == BACKSPACE || character == RETURN_KEY)
{
switch(character)
{
case EOF:
endOfFile = true;
break;
case BACKSPACE:
case BACKSPACE_DEL:
line.delChar(DEL_BACKWARD);
break;
case RETURN_KEY:
character = LINE_FEED;
default:
line.addChar((char)character);
break;
}
return;
}
}
pattern = Pattern.compile("\\^\\[\\[(.{1}).*");
if(scanner.findWithinHorizon(pattern,3) != null) //escape sequence
{
int character = scanner.match().group(1).charAt(0);
switch(character)
{
case FORWARD:
line.setCursorTo(line.getCursorPosition()+1);
break;
case BACKWARD:
line.setCursorTo(line.getCursorPosition()-1);
break;
case DEL:
line.delChar(DEL_FORWARD);
break;
case INSERT_KEY:
line.toggleMode();
break;
}
return;
}
pattern = Pattern.compile("\\^\\[O(\\w{1})");
if(scanner.findWithinHorizon(pattern,3) != null) //HOME or END
{
int character = (int)scanner.match().group(1).charAt(0);
switch(character)
{
case HOME:
line.setCursorTo(1);
break;
case END:
line.setCursorTo(line.length()+1);
break;
}
return;
}
}
public int read() throws IOException
{
return super.read();
}
public String readLine()
{
try
{
setRaw();
}
catch (Exception e)
{
System.out.println("Couldn't set terminal in raw mode");
return "";
}
try
{
while(!endOfFile)
{
parseKey();
}
}
catch(Exception e)
{
System.out.println("Error reading line");
return "";
}
try
{
unsetRaw();
}
catch (Exception e)
{
System.out.println("Couldn't unset raw mode");
return "";
}
System.out.println("");
return line.toString();
}
}
/* TO-DO
*
* up/down keys (needs text to work)
* pgup pgdown keys (goesto penultima linea visible)
* read terminal size
* update size dynamically
* long strings wrap down
* cursor keys skip final \n on a line
* careful if overwrite mode and final character is \n
*/