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From: Philipp Gesang <gesang@stud.uni-heidelberg.de>
To: ConTeXt ML <ntg-context@ntg.nl>
Subject: [callbacks] proper registration, node subtypes
Date: Mon, 25 Jun 2012 15:39:24 +0200	[thread overview]
Message-ID: <20120625133924.GB31738@phlegethon> (raw)


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Hi all,

I need a (pre-linebreak) callback to behave the same way with the
Context and Plain formats. *The sequence that nodes are traversed
in is very important.* Afaict the callback will have to be
registered as a “processors”/“before” nodes task. However, the
behavior is not identical:

1.  If the list contains a vlist or hlist, the callback is
    applied first on the inner list and then on the outer list.
    (Guess: it’s applied on the hpack_filter as well?)

2.  In Plain, glyph nodes have subtype 0 (GLYPH_CHARACTER), while
    in Context it’s 1 (GLYPH_LIGATURE).

Example code is appended.

Questions:
  - Which node task gets me a behavior similar to the raw
    pre_linebreak_filter?[*]
  - Does the difference wrt node subtype matter assuming I only
    (a) copy glyph nodes and (b) manipulate their .char field?

Any insights on this matter would be greatly appreciated. Regards
Philipp

[*] If this is not possible|recommended, what would a clean
    solution look like?



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             reply	other threads:[~2012-06-25 13:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-25 13:39 Philipp Gesang [this message]
2012-06-25 14:21 ` Hans Hagen
2012-06-25 14:50   ` Philipp Gesang
2012-06-26 11:13     ` Hans Hagen
2012-06-26 12:08       ` Philipp Gesang
2012-06-26 12:50         ` Hans Hagen

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