In my package, there is a tag structure that looks sort of like this (using
LaTeX like syntax rather than TeXmacs):
\zcite{zfieldID}{zfield-Data-v}{zfield-Text-t}
where the zfield-Text-t is like:
\zciteLayoutPrefix{...}\zsubCite{...}\zciteLayoutDelimiter{...}...\zciteLayoutSuffix{...}
When the cursor is just to the right of the zcite, it is highlit by a cyan
box. Pressing the left arrow key causes the cursor to jump all the way over
the zcite. When the cursor is just to the right of the zcite and I press
Backspace, it disactivates the tag and then I can move the cursor inside of
it. While I am inside of the disactivated zcite, the cursor moves in and
out of the zciteLayoutPrefix, zciteLayoutDelimiter, and zciteLayoutSuffix
tags.
The desired behavior is that I want to be able to cursor inside of the
zcite's zfield-Text-t, but I don't want to be able to cursor inside of the
zciteLayoutPrefix, zciteLayoutDelimiter, zciteLayoutSuffix, or zsubCite
tags, and of those, only the zsubCite tag can usefully support being
disactivated or changing mode to allow the cursor to move inside of it's
contents.
I actually like the way the cursor jumps across the zcite, leaving it as a
whole thing in itself... but I am implementing cutting and pasting of
zsubCite's that occur within the zcite, since a zcite field contains a
citeproc citation cluster that can have more than one source cited... So if
I could add another flag to the zfield-Data-v that is to hold the "drd"
state of the zfield... and have it support more than one "mode": (1)
Normal, where the cursor jumps across it, (2) cursor can move inside of the
zfield-Text-t, but the zcite is not disactivated, (3) zcite is disactivated.
In state (2), I want the cursor to jump over zsubCite's and the other
elements, which are the CSL style's citation layout prefix, delimiter, and
suffix strings wrapped in tags to give them handles and semantics. In state
(2), I ought to be able to use Ctrl-Space to set the mark, then arrows to
select zsubCite's. It does that now, and does select entire blocks, but not
as neatly, plus...
When in state (2), I want to move the cursor inside of the zfield-Text-t,
but have it's movement constrained to points between the zciteLayoutPrefix,
zsubCite, zciteLayoutDelimiter, or zciteLayoutSuffix, while the user
chooses a location at which to perform a clipboard-paste of zsubCite's
taken via clipboard-cut from another zcite field.
The constrained movement could be implemented via keyboard command
overloads that respect the context the way I need... but what about
drd-props to allow moving the cursor inside of the zcite, without needing
to disactivate it first?
Can a scheme program alter drd-props on-the-fly?
I'm having trouble even getting changes to drd-props that I put into the
tm-zotero.ts to have any effect at all. From my understanding, it ought to
already be allowing the cursor to move inside of the zcite, but it does
not. What's the secret to it? I've seen TeXmacs dump a C++ stack trace, and
then after that, I could move the cursor inside of the zcite! What changed
that allowed that? Can it be set up deliberately without an accidental segv?
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