Terminal control/Restricted width positional input/No wrapping: Difference between revisions
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For the purpose of this task, obtain input from the user, showing data entry at row 3, column 5, with input width restricted to a maximum of 8 characters.
Note: In this task input wrapping is not allowed. (See [[
For a similar task using a graphical user interface, see [[
[[Category:Terminal control]]
=={{header|Common Lisp}}==
==={{header|ncurses}}===
To interface ncurses from Lisp, the ''[https://www.cliki.net/croatoan croatoan]'' library is used.
<syntaxhighlight lang="lisp">;; Load the library from the quicklisp repository
(ql:quickload "croatoan")
(in-package :croatoan)
(defun field-input-no-wrapping (row column input-length)
(with-screen (scr :input-echoing nil :cursor-visible t :enable-colors t :enable-function-keys t :input-blocking t)
(let ((field (make-instance 'field :position (list row column) :width input-length :window scr)))
(setf (style field)
(list :background (list :simple-char #\.)))
(bind field #\newline 'accept)
(edit field)
(clear scr)
(refresh scr)
;; return the value of the field as a string
(value field))))
;; call the routine
(field-input-no-wrapping 2 4 8)</syntaxhighlight>
=={{header|FreeBASIC}}==
<syntaxhighlight lang="freebasic">Function getInput(fila As Integer, columna As Integer, ancho As Integer) As String
Locate fila, columna, 0
Dim As String KBD, cadena = ""
Do
Do: KBD = Inkey: Loop Until KBD <> ""
If KBD = Chr(8) Then
cadena = Left(cadena, Len(cadena) - 1)
Print !"\b ";
Else
If Len(cadena) < ancho Then cadena &= KBD
End If
Locate fila, columna : Print cadena;
Loop Until KBD = Chr(13)
Return cadena
End Function
Dim As String s = getInput(3, 5, 8)
Locate 23,1 : Print "You entered: "; s
Sleep</syntaxhighlight>
=={{header|Go}}==
{{works with|Windows 10}}
{{trans|Kotlin}}
<br>
This uses _getch() rather than _getwch() as only ASCII is supported.
<syntaxhighlight lang="go">package main
/*
#include <windows.h>
#include <conio.h>
*/
import "C"
import (
"fmt"
"os"
"os/exec"
)
var conOut = C.GetStdHandle(C.STD_OUTPUT_HANDLE)
func setCursor(p C.COORD) {
C.SetConsoleCursorPosition(conOut, p)
}
func cls() {
cmd := exec.Command("cmd", "/c", "cls")
cmd.Stdout = os.Stdout
cmd.Run()
}
func getInput(row, col, width int) string {
if row < 0 || row > 20 || col < 0 || width < 1 || width > 78 || col > (79 - width) {
panic("Invalid parameter(s) to getInput. Terminating program")
}
coord := C.COORD{C.short(col), C.short(row)}
setCursor(coord)
var sb []byte
full := false
loop:
for {
ch := C._getch() // gets next character, no echo
switch c := byte(ch); c {
case 3, 13:
break loop // break on Ctrl-C or enter key
case 8:
if len(sb) > 0 { // mimic backspace
fmt.Print("\b \b")
sb = sb[:len(sb) - 1]
}
case 0, 224:
C._getch() // consume extra character
default:
if c >= 32 && c <= 126 && !full {
C._putch(ch) // echo ascii character, ignore others
sb = append(sb, c)
}
}
full = len(sb) == width // can't exceed width
}
return string(sb)
}
func main() {
cls() // clear the console
s := getInput(2, 4, 8) // Windows console row/col numbering starts at 0
coord := C.COORD{0, 22}
setCursor(coord)
fmt.Printf("You entered '%s'\n", s)
}</syntaxhighlight>
=={{header|Julia}}==
Requires an ANSI compatible terminal and a system C library implementing _getch() for unbuffered keyboard input. Note the code below is identical to the code in [[Terminal_control/Restricted_width_positional_input/No_wrapping]] but with no width argument in the input call.
<syntaxhighlight lang="julia">getch() = UInt8(ccall(:_getch, Cint, ()))
cls() = print("\33[2J")
reposition(row, col) = print("\u001b[$row;$(col)H")
clearfromcursor() = print("\u001b[K")
function input_y_x_upto(row, col, cmax, width=cmax)
buf = ""
while (buflen = length(buf)) < cmax && !((c = getch()) in [0xff, 0x0d, 0x0a])
reposition(row, col)
clearfromcursor()
if c == '\b' && buflen > 0
buf = buf[1:end-1]
else
buf = buf * Char(c)
end
print(buf[(buflen > width ? buflen - width + 1 : 1):end])
end
return buf
end
cls()
reposition(3, 5)
s = input_y_x_upto(3, 5, 8)
println("\n\n\nResult: You entered <<$s>>")
</syntaxhighlight>
=={{header|Kotlin}}==
{{works with|Windows 10}}
This assumes an 80 x 25 Windows console and uses the Win32 function _getwch() to get character input without (immediately) echoing it to the console. Only ASCII characters in the range 32 to 126 are then printed if the maximum width would not be exceeded.
Apart from these, only the backspace key (8), return key (13) and Ctrl-C (3) are handled, all other keys being ignored. Some keys (such as the function and arrow keys) return a two character sequence starting with either 0 or 224 and so, after the first character is trapped, the second character needs to be removed from the buffer.
It would also be possible to allow for printable Unicode characters (>= 160) to be entered by adding an extra clause to the 'when' statement. However, for this to work properly, you will need to be using a suitable code page (65001, say) and a suitable font (Lucida Console, say).
<syntaxhighlight lang="scala">// Kotlin Native v0.5
import kotlinx.cinterop.*
import platform.windows.*
import platform.posix.*
val ascii = 32..126
val conOut = GetStdHandle(STD_OUTPUT_HANDLE)!!
fun setCursor(p: COORD) = SetConsoleCursorPosition(conOut, p.readValue())
fun getInput(row: Short, col: Short, width: Int): String {
require(row in 0..20 && col in 0..(79 - width) && width in 1..78) { "Invalid parameter(s)" }
memScoped {
val coord = alloc<COORD>().apply { X = col; Y = row }
setCursor(coord)
}
val sb = StringBuilder(width)
var full = false
loop@ while (true) {
val ch = _getwch() // gets next character, no echo
when (ch.toInt()) {
3, 13 -> break@loop // break on Ctrl-C or enter key
8 -> if (sb.length > 0) { print("\b \b"); sb.length-- } // mimic backspace
0, 224 -> _getwch() // consume extra character
in ascii -> if (!full) { _putwch(ch); sb.append(ch.toChar()) } // echo ascii character
else -> {} // igore other characters
}
full = sb.length == width // can't exceed width
}
return sb.toString()
}
fun main(args: Array<String>) {
system("cls") // clear the console
val s = getInput(2, 4, 8) // Windows console row/col numbering starts at 0
memScoped {
val coord = alloc<COORD>().apply { X = 0 ; Y = 22 }
setCursor(coord)
}
println("You entered '$s'")
}</syntaxhighlight>
=={{header|Nim}}==
{{trans|Julia}}
As in the Julia version we translated, the code is identical to the code in [[Terminal_control/Restricted_width_positional_input/No_wrapping]] but with no width argument in the input call. See this version for some general comments about the code.
<syntaxhighlight lang="nim">import strformat, terminal
proc eraseLineEnd() = stdout.write("\e[K")
proc inputXYUpto(row, col, cmax: int; width = cmax): string =
while result.len < cmax and not ((let c = getch(); c) in ['\xff', '\f', '\r']):
setCursorPos(row, col)
eraseLineEnd()
if c in ['\b', '\x7f'] and result.len > 0:
result.setLen(result.len - 1)
else:
result.add c
stdout.write result[(if result.len > width: result.len - width else: 0)..result.high]
eraseScreen()
setCursorPos(3, 5)
let s = inputXYUpto(3, 5, 8)
echo &"\n\n\nResult: You entered <<{s}>>"</syntaxhighlight>
=={{header|Perl}}==
Works on ArchLinux in an xterm.
<syntaxhighlight lang="perl">#!/usr/bin/perl
use strict; # https://rosettacode.org/wiki/Terminal_control/Restricted_width_positional_input/No_wrapping
use warnings;
use List::Util qw( min max );
$| = 1;
sub label { printf "\e[%d;%dH%s", @_; }
sub getinput
{
my ($row, $column, $length, $prompt) = @_;
defined $prompt and length $prompt < $column - 1 and
label( $row, $column - length $prompt, $prompt);
my $at = "\e[%d;%dH%-$length.${length}s\e[%d;%dH";
my $input = '';
my $pos = 0;
use Term::ReadKey;
eval
{
ReadMode 'cbreak';
local $_;
my $more = 1;
while( $more )
{
printf $at, $row, $column, $input, $row, $column + $pos;
0 < sysread *STDIN, $_, 1024 or last;
print "\e[10;1H\e[J"; use Data::Dump 'dd'; dd $_;
for( /\e[O\[][0-9;]*[A-~]|./gs )
{
/^[\n\r\e]\z/ ? do { $more = 0 } :
/^[ -~]\z/ ? do {
substr $input, $pos++, 0, $_; $input &= "\xff" x $length;
$pos = min $pos, $length } :
$_ eq "\b" ? do { $pos = max $pos - 1, 0; substr $input, $pos, 1, '' } :
$_ eq "\e[D" ? do { $pos = max 0, $pos - 1 } :
$_ eq "\e[C" ? do { $pos = min length $input, $pos + 1 } :
$_ eq "\e[H" ? do { $pos = 0 } :
$_ eq "\e[F" ? do { $pos = length $input } :
$_ eq "\e[3~" ? do { length $input and substr $input, $pos, 1, ''; } :
0;
}
}
};
ReadMode 'restore';
return $input;
}
print "\e[H\e[J";
#label(2, 5, "Enter input below");
my $text = getinput( 3, 25, 8, "test string: " );
print "\n\nyour input <$text>\n";</syntaxhighlight>
=={{header|Phix}}==
<!--<syntaxhighlight lang="phix">(notonline)-->
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (position, wait_key, backspace)</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">getInput</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">row</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">col</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">width</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">position</span><span style="color: #0000FF;">(</span><span style="color: #000000;">row</span><span style="color: #0000FF;">,</span><span style="color: #000000;">col</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">ch</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">wait_key</span><span style="color: #0000FF;">()</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">ch</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'\r'</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">ch</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'\b'</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)></span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\b \b"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..$-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">elsif</span> <span style="color: #000000;">ch</span><span style="color: #0000FF;">>=</span><span style="color: #008000;">' '</span> <span style="color: #008080;">and</span> <span style="color: #000000;">ch</span><span style="color: #0000FF;"><=</span><span style="color: #008000;">'~'</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)<=</span><span style="color: #000000;">width</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">ch</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">s</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">ch</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">s</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #7060A8;">clear_screen</span><span style="color: #0000FF;">()</span> <span style="color: #000080;font-style:italic;">-- clear the console</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">getInput</span><span style="color: #0000FF;">(</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">5</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">8</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">position</span><span style="color: #0000FF;">(</span><span style="color: #000000;">23</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"You entered '%s'\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">s</span><span style="color: #0000FF;">})</span>
<!--</syntaxhighlight>-->
=={{header|Raku}}==
(formerly Perl 6)
{{works with|Rakudo|2018.10}}
Should work with any termios compatible terminal.
All printable character keys work, as does backspace and enter. Ctrl-c to exit. All other keys / key-combos are ignored.
<syntaxhighlight lang="raku" line>use Term::termios;
constant $saved = Term::termios.new(fd => 1).getattr;
constant $termios = Term::termios.new(fd => 1).getattr;
# raw mode interferes with carriage returns, so
# set flags needed to emulate it manually
$termios.unset_iflags(<BRKINT ICRNL ISTRIP IXON>);
$termios.unset_lflags(<ECHO ICANON IEXTEN ISIG>);
$termios.setattr(:DRAIN);
END {
$saved.setattr(:NOW); # reset terminal to original settings
print "\e[?25h \e[H\e[J"; # clear and reset screen
}
my $row = 3;
my $column = 5;
my $field = '';
my $spacer = ' ' x 8;
my $pointer = 0;
my ($rows,$cols) = qx/stty size/.words; # get screen size
my @screen = "\e[41m{' ' x $cols}\e[0m" xx $rows;
update($spacer);
loop {
my $key = $*IN.read(4).decode;
given $key {
when ' '..'~' {
if $pointer < 8 {
$field ~= $_;
$spacer = ' ' x 8 - $field.chars;
$pointer +=1;
update($field~$spacer)
}
}
when "\c[127]" { # backspace
if $pointer > 0 {
$field.=substr(0,*-1);
$spacer = ' ' x 8 - $field.chars;
$pointer -= 1;
update($field~$spacer)
}
}
when "\c[13]" {
update(' ');
print "\e[10;6H\e[1;33;41mYou entered: $field\e[0m\e[$row;{$column}H";
$field = '';
$pointer = 0;
}
when "\c[0003]" { exit } # Ctrl-c
default { }
}
}
sub update ($str) {
($rows,$cols) = qx/stty size/.words;
@screen = "\e[41m{' ' x $cols}\e[0m" xx $rows;
print "\e[H\e[J{@screen.join: "\n"}\e[$row;{$column}H$str\e[$row;{$column + $pointer}H";
}</syntaxhighlight>
=={{header|REXX}}==
(This REXX program only works with: REXX/Personal)
<syntaxhighlight lang="rexx">/*REXX pgm reads text from the terminal screen from a certain row, column, and length.*/
parse arg row col len . /*obtain optional arguments from the CL*/
if row=='' | row=="," then row= 3 /*Not specified? Then use the default.*/
if col=='' | col=="," then col= 5 /* " " " " " " */
if len=='' | len=="," then len= 8 /* " " " " " " */
parse upper version v . /*obtain the version of REXX being used*/
if v\=='REXX/PERSONAL' then do; say /*Not correct version? Tell err msg. */
say '***error***:'
say 'This REXX program requires Personal REXX version.'
say
exit 13
end
$= scrread(row, col, len)
say 'data read from terminal row ' row " col " col ' length ' len " is:"
say $
exit 0 /*stick a fork in it, we're all done. */</syntaxhighlight>
=={{header|Wren}}==
Due to a bug the ''Stdin.readByte()'' method can currently process only the first byte of a multi-byte character. The others are skipped.
<syntaxhighlight lang="wren">import "io" for Stdin, Stdout
var textAtPos = Fn.new { |text, r, c|
System.write("\e[%(r);%(c)H%(text)")
Stdout.flush()
}
var input = Fn.new { |r, c, maxWidth|
System.write("\e[2J")
textAtPos.call("", r, c)
Stdin.isRaw = true
var w = 0
var res = List.filled(maxWidth, "")
while (true) {
var byte = Stdin.readByte()
if (byte >= 32 && byte < 127) { // All printable ASCII characters
var char = String.fromByte(byte)
textAtPos.call(char, r, c+w)
if (w < maxWidth-1) {
res[w] = char
w = w + 1
} else {
System.write("\b")
Stdout.flush()
res[w] = char
}
} else if (byte == 127 && w > 0) { // Backspace/delete (127 used rather than 8)
System.write("\b \b")
Stdout.flush()
w = w - 1
res[w] = ""
} else if (byte == 13 || byte == 10) { // Carriage return or line feed
System.print()
break
} else if (byte == 3 || byte == 4) { // Ctrl-C or Ctrl-D
Fiber.abort("\nScript aborted")
}
}
Stdin.isRaw = false
return res.join().trimEnd(" ")
}
var res = input.call(3, 5, 8)
System.print(res)</syntaxhighlight>
=={{header|XPL0}}==
<syntaxhighlight lang="xpl0">proc GetData(Col, Row, Width, Str);
int Col, Row, Width; char Str;
int I, C;
string 0;
[Cursor(Col, Row);
I:= 0;
loop [C:= ChIn(1); \Ctrl+C aborts
if C = $0D \CR\ then
[Str(I):= 0; \terminate\ quit];
if C = $08 \BS\ then
[if I > 0 then
[I:= I-1;
ChOut(0, C); \echo backspace
ChOut(0, ^ ); \erase character
ChOut(0, C); \echo backspace
];
];
if I<Width & C>=$20 & C<=$7E then
[ChOut(0, C); \echo character
Str(I):= C;
I:= I+1;
];
];
];
char Str(8+1);
[ChOut(0, $0C \FF\); \clear screen
GetData(5, 3, 8, Str);
Text(0, "
You entered: ");
Text(0, Str);
]</syntaxhighlight>
=={{header|Yabasic}}==
<syntaxhighlight lang="yabasic">// Rosetta Code problem: http://rosettacode.org/wiki/Restricted_width_positional_input/No_wrapping
// by Galileo, 04/2022
clear screen
sub getInput$(r, c, long)
local text$, c$
c = c - 1
r = r - 1
print at(c, r);
do
c$ = inkey$
if c$ = "enter" break
if c$ = "backspace" then
text$ = left$(text$, len(text$) - 1)
print "\b ";
else
if len(text$) < long text$ = text$ + c$
end if
print at(c, r) text$;
loop
return text$
end sub
text$ = getInput$(3, 5, 8)
print at(1, 23) "You entered: ", text$</syntaxhighlight>
| |||