Rosetta Code

Terminal control/Restricted width positional input/With wrapping: Difference between revisions

Page Discussion

Terminal control/Restricted width positional input/With wrapping (view source)

Revision as of 12:18, 13 February 2024

17,193 bytes added ,  3 months ago
m
→‎{{header|Wren}}: Changed to Wren S/H
m (bugfix)
m (→‎{{header|Wren}}: Changed to Wren S/H)
 
(17 intermediate revisions by 10 users not shown)
Line 1:
{{draft task}}
[[Category:Terminal control]]
 
Create a routine to obtain data entry using a specific place on the terminal screen. Data entry fields should be restricted to a specific length, and the cursor should not move beyond the input length.
 
TheData routineentry fields should acceptbe parametersrestricted forto rowa numberspecific length, column number  and inputthe length, andcursor should obtainnot amove stringbeyond the input length.
value entered by the user.
 
The routine should accept parameters for row number,   column number,   and input length,   and should obtain a string value entered by the user.
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.
 
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 allowed. If the length of input exceeds the maximum width, the left hand side of the field should disappear, allowing additional input to be obtained. However, the cursor must not move beyond the designated input length.
 
 
Note:   in this task input wrapping is allowed.   If the length of input exceeds the maximum width, the left hand side of the field should disappear, allowing additional input to be obtained.   However, the cursor must not move beyond the designated input length.
 
It is permissible to use navigation keys to see input field length.
Line 14 ⟶ 17:
(See [[Terminal control/Restricted width positional input/No wrapping]] for similar input routine with no wrapping).
 
For a similar task using a graphical user interface,   see   [[Graphical User Interface/Restricted width positional input/With wrapping]].
<br><br>
 
=={{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-with-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 :max-buffer-length 30 :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-with-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 = ""
Dim As Integer ini
Do
Do: KBD = Inkey: Loop Until KBD <> ""
If KBD = Chr(8) Then 'backspace
cadena = Left(cadena, Len(cadena) - 1)
Print !"\b ";
Else
cadena &= KBD
End If
ini = Iif(Len(cadena) > ancho, Len(cadena) - ancho + 1, 1)
Locate fila, columna : Print Mid(cadena, ini, ancho);
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>
 
[[Category:Terminal control]]
 
=={{header|Go}}==
Line 23 ⟶ 75:
<br>
This uses _getch() rather than _getwch() as only ASCII is supported.
<langsyntaxhighlight lang="go">package main
 
/*
Line 103 ⟶ 155:
setCursor(coord)
fmt.Printf("You entered '%s'\n", s)
}</langsyntaxhighlight>
 
 
=={{header|Julia}}==
Requires an ANSI compatible terminal and a system C library implementing _getch() for unbuffered keyboard input.
<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, 80, 8)
println("\n\n\nResult: You entered <<$s>>")
</syntaxhighlight>
 
=={{header|Kotlin}}==
{{works with|Windows 10}}
This follows a similar approach to the Kotlin entry for the [[Terminal control/Restricted width positional input/No wrapping]] task except, of course, that the code now allows for wrapping.
<langsyntaxhighlight lang="scala">// Kotlin Native v0.5
 
import kotlinx.cinterop.*
Line 176 ⟶ 257:
}
println("You entered '$s'")
}</langsyntaxhighlight>
 
=={{header|Nim}}==
{{trans|Julia}}
Rather than using directly escape codes, we use the standard module <code>terminal</code> which works on Posix systems and on Windows. Unfortunately, there is no function to clear from cursor to end of line, so we had to provide one, but it works only on Posix systems.
 
We had also to check for backspace character and for character <code>'\x7f'</code> as the backspace key gives this last value (but Control+H gives <code>'\x08'</code> i.e. ASCII backspace character).
 
<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, 80, 8)
echo &"\n\n\nResult: You entered <<{s}>>"</syntaxhighlight>
 
=={{header|Perl}}==
<syntaxhighlight lang="perl">#!/usr/bin/perl
 
use strict; # https://rosettacode.org/wiki/Terminal_control/Restricted_width_positional_input/With_wrapping
use warnings;
use Term::ReadKey;
 
sub input
{
my ($row, $column, $length) = @_;
my ($input, $done, $start) = ( '', 0,
"\e[$row;${column}H" . ' ' x $length . "\e[$row;${column}H");
local $| = 1;
ReadMode 'raw';
until( $done )
{
print $start, substr $input, -$length;
local $_ = ReadKey 0;
if( tr/ -~// ) { $input .= $_ } # add char
elsif( tr/\cu// ) { $input = '' } # clear all
elsif( tr/\b\x7f// ) { chop $input } # delete last char
elsif( tr/\n\r\e\cc// ) { $done++ } # guess!
}
ReadMode 'restore';
return $input;
}
 
print "\e[H\e[Jinput at row 3 column 5 length 8\n";
my $in = input( 3, 5, 8 );
print "\n\n\ninput is $in\n\n";</syntaxhighlight>
 
=={{header|Phix}}==
<!--<syntaxhighlight lang="phix">(notonline)-->
<lang Phix>function getInput(integer row, col, width)
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (position, wait_key)</span>
position(row,col)
<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>
string s = ""
<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>
while 1 do
<span style="color: #004080;">string</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
integer ch = wait_key()
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
if ch='\r' then exit end if
<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>
if ch='\b' then
<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>
if length(s)>0 then
<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>
puts(1,"\b \b")
<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>
s = s[1..$-1]
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\b \b"</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..$-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
if length(s)>=width then
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
position(row,col)
<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>
puts(1,s[-width..-1])
<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>
end if
<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;">s</span><span style="color: #0000FF;">[-</span><span style="color: #000000;">width</span><span style="color: #0000FF;">..-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
elsif ch>=' ' and ch<='~' then
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
s &= ch
<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>
if length(s)<=width then
<span style="color: #000000;">s</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">ch</span>
puts(1,ch)
<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>
else
<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>
position(row,col)
<span style="color: puts(1,s[-width..-1])#008080;">else</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>
end if
<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;">s</span><span style="color: #0000FF;">[-</span><span style="color: #000000;">width</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;">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 (except Tab) 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)
} elsif $pointer >= 8 {
$field ~= $_;
$spacer = '';
update($field.substr(*-8))
}
}
when "\c[127]" { # backspace
if $pointer > 0 {
$field.=substr(0,*-1);
$spacer = ' ' x (8 - $field.chars max 0);
$pointer -= 1 if $field.chars < 8;
my $display = $field.chars < 8 ?? $field !! $field.substr(*-8);
update($display~$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}}==
(Only works with: &nbsp; 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 res = ""
var blank = " " * (maxWidth-1)
while (true) {
var byte = Stdin.readByte()
if (byte >= 32 && byte < 127) { // All printable ASCII characters
var char = String.fromByte(byte)
res = res + char
var count = res.count
if (count <= maxWidth-1) {
textAtPos.call(res, r, c)
} else {
textAtPos.call(res[-maxWidth+1..-1], r, c)
}
} else if (byte == 127 && res.count > 0) { // Backspace/delete (127 used rather than 8)
res = res[0...-1]
var count = res.count
if (count <= maxWidth-1) {
textAtPos.call(blank, r, c)
textAtPos.call(res, r, c)
} else {
textAtPos.call(res[-maxWidth+1..-1], r, c)
}
} 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
}
 
var res = input.call(3, 5, 8)
System.print(res)</syntaxhighlight>
 
=={{header|Yabasic}}==
<syntaxhighlight lang="yabasic">// Rosetta Code problem: http://rosettacode.org/wiki/Restricted_width_positional_input/With_wrapping
// by Galileo, 04/2022
 
clear screen
 
sub getInput$(r, c, long)
local text$, c$, ini, lt
c = c - 1
r = r - 1
print at(c, r);
do
c$ = inkey$
if c$ = "enter" break
if c$ = "backspace" then
text$ = left$(text$, len(text$) - 1)
print "\b ";
else
text$ = text$ + c$
end if
lt = len(text$)
end while
if lt > long then ini = lt - long + 1 else ini = 1 end if
return s
print at(c, r) mid$(text$, ini, long);
end function
loop
return text$
end sub
 
text$ = getInput$(3, 5, 8)
clear_screen() -- clear the console
string s = getInput(3, 5, 8)
print at(1, 23) "You entered: ", text$</syntaxhighlight>
position(23,1)
printf(1,"You entered '%s'\n",{s})</lang>
PureFox
9,476

edits

Retrieved from "https://rosettacode.org/wiki/Special:MobileDiff/225010...351940"