[prev in list] [next in list] [prev in thread] [next in thread] 

List:       konsole-devel
Subject:    [Konsole-devel] [Bug 107487] Please add the xterm-256 colour
From:       Lars Doelle <lars.doelle () on-line ! de>
Date:       2006-06-07 0:03:31
Message-ID: 20060607000331.20489.qmail () ktown ! kde ! org
[Download RAW message or body]

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
         
http://bugs.kde.org/show_bug.cgi?id=107487         




------- Additional Comments From lars.doelle on-line de  2006-06-07 02:03 \
------- Hmm, a quick follow up...

On Tuesday 06 June 2006 23:20, lars.doelle on-line de wrote:

> The code really spells
> > 48 - set default background color
> > 5 - set blink
> > <PS> - for <Color> in most cases an unknown name.


Here i am wrong - 48 is not defined, at least not for VT100 and its \
successors. Neverthenless it does not invalidate my argumentation. See e.g.

http://vt100.net/docs/vt100-ug/chapter3.html#S3.3.2

which is very clear about the association. Thus 48 would be ignored, 5 \
would set blink and any defined value for PS would legal be interpreted as \
such by virtually any terminal which emulates a VT100 based set of ESC \
codes. The extension is incompatible.

But - ECMA-48:

http://www.ecma-international.org/publications/files/ecma-st/ECMA-048.pdf

See §8.3.117 (SGR), page 62
---
38 (reserved for future standardization; intended for setting character \
foreground colour as specified in  ISO 8613-6 [CCITT Recommendation T.416])
48 (reserved for future standardization; intended for setting character \
background colour as specified in  ISO 8613-6 [CCITT Recommendation T.416])
---

Hmm, ISO/IEC 8613-6:1994 - this means $$$

http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=22943
 Add to shopping basket  Size     Price
  ISO/IEC 8613-6:1994 PDF version (en)  15052 KB     CHF 164,00

The codes may or may not be defined as used in xterm, moving the whole \
thing in safer waters, especially with respect to codes 38,48.

Anyway still issues. How is this supposed to work? Keep in mind that the \
code is associative. Citing ECMA-48:

---
5.4.3 Types of parameters
      In a control sequence with parameters, each parameter sub-string \
                corresponds to one parameter and
      represents the value of that parameter. The number of parameters is \
                either fixed or variable, depending
      on the control function. If the number of parameters is variable, \
                neither the maximum number of values
      nor the order in which the corresponding actions are performed are \
                defined by this Standard.
      A parameter may be purely numeric or it may be selective, i.e. \
denoting one of a numbered list of actions  the control function can \
                perform.
      ...
---

Each parameter substring represents one parameter.

---
5.4.2 Parameter string format
      A parameter string which does not start with a bit combination in the \
range 03/12 to 03/15 shall have the  following format:
      a) A parameter string consists of one or more parameter sub-strings, \
each of which represents a number  in decimal notation.
      b) Each parameter sub-string consists of one or more bit combinations \
                from 03/00 to 03/10; the bit
          combinations from 03/00 to 03/09 represent the digits ZERO to \
                NINE; bit combination 03/10 may be
          used as a separator in a parameter sub-string, for example, to \
separate the fractional part of a decimal  number from the integer part of \
that number.  c) Parameter sub-strings are separated by one bit combination \
                03/11.
      ...
----

So a parameter substring is 0-9 and the colon. The semicolon separates \
sub-parameters. Thus 48:5:<Color> would be one sub-parameter, and \
48;5;<Color> many independent, each having an independent meaning in case \
of a selective parameter.

---
8.3.117 SGR - SELECT GRAPHIC RENDITION
        Notation: (Ps...)
        Representation: CSI Ps... 06/13
        Parameter default value: Ps = 0
---

Above, Ps... means variable number of selective parameters.

If they really do 48;5;<Color>, this is inconsistent, as it breaks the \
parameter concept cited above, at least in my reading. So how to interpret \
e.g.?

ESC[48;5m ESC[39m
ESC[48m ESC[5m ESC[39m
ESC[39;48;49m


-lars



_______________________________________________
konsole-devel mailing list
konsole-devel@kde.org
https://mail.kde.org/mailman/listinfo/konsole-devel


[prev in list] [next in list] [prev in thread] [next in thread]