Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.forth > #59747

Re: The Forth console and cursor management

Show all headers | View raw

Alex <alex@rivadpm.com> writes:
>
><quote>
>6.1.0695 ACCEPT
>
>Because external system hardware and software may perform the ACCEPT 
>function, when a line terminator is received the action of the cursor, 
>and therefore the display, is implementation-defined. It is recommended 
>that *the cursor remain immediately following the entered text* after a 
>line terminator is received.
></quote>
>
>Which is very elegant, but unfortunately with a standard Windows console 
>an absolute swine to implement. Using file reads through stdin, Windows 
>treats the enter key as a CR LF, and moves the cursor appropriately.

Under Unix you have to switch the terminal to raw mode to get decent
behaviour.  Googling for "Windows console raw mode" brought up this:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms683462%28v=vs.85%29.aspx

This tells you to disable Line input mode, Processed input mode, Echo
input mode and Processed output mode to get the console into raw mode.

> A 
>quick straw poll:
>
>Does your favourite Forth do this (the > and < are meta chars to 
>indicate input and output, the underscore is the cursor caret)
>
>   >1 2 3 .s
>   <[3] 1 2 3  ok[3]
>   <_
>
>
>or this?
>
>   >1 2 3 .s [3] 1 2 3  ok[3]
>   <_

1 2 3 .s <3> 1 2 3  ok

I don't think that the other output would be particularly revealing,
because the .S may contain a CR itself.

Better tests are:

key .

(and then press "a" without "enter").  On Gforth, SwiftForth, and VFX
this gives:

key . 97  ok

Once you have a properly working KEY (which requires raw mode), you
can build an ACCEPT on top of that.

The alternative indicated in the text above is if you cannot get a
raw-mode terminal.  Then KEY and KEY? won't work properly, and ACCEPT
will just process the complete line provided by the cooked-mode
terminal.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2017: http://www.euroforth.org/ef17/

Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

The Forth console and cursor management Alex <alex@rivadpm.com> - 2017-05-23 12:57 +0100
  Re: The Forth console and cursor management Raimond Dragomir <raimond.dragomir@gmail.com> - 2017-05-23 05:18 -0700
  Re: The Forth console and cursor management anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-23 12:48 +0000
    Re: The Forth console and cursor management Alex <alex@rivadpm.com> - 2017-05-23 15:45 +0100
    Re: The Forth console and cursor management albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-05-23 20:48 +0200
      Re: The Forth console and cursor management anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-05-24 10:16 +0000
  Re: The Forth console and cursor management minforth@arcor.de - 2017-05-23 06:22 -0700
    Re: The Forth console and cursor management Mark Wills <markwills1970@gmail.com> - 2017-05-23 06:27 -0700
  Re: The Forth console and cursor management minforth@arcor.de - 2017-05-23 06:44 -0700
    Re: The Forth console and cursor management rickman <gnuarm@gmail.com> - 2017-05-23 11:50 -0400
  Re: The Forth console and cursor management Matthias Trute <matthias.trute@gmail.com> - 2017-05-23 09:20 -0700
    Re: The Forth console and cursor management rickman <gnuarm@gmail.com> - 2017-05-23 17:46 -0400
  Re: The Forth console and cursor management peter.m.falth@gmail.com - 2017-05-23 12:12 -0700
  Re: The Forth console and cursor management Rob Sciuk <rob@controlq.com> - 2017-05-26 12:44 -0400

csiph-web