Re: [tlaplus] Font dependency specification

How about using a record for representing a font attribute, with the set of all such records defined as:

FontAttribute == [fontset : FontSet, face : Face, overlay : Overlay]

for suitable constants FontSet, Face, and Overlay.

It looks like the possible attributes at a specific "point" are restricted further, these could then be specified along the lines of

FontAttributes(pt) == [fontset : FontSetsAt(pt), face : FacesAt(pt), overlay : OverlaysAt(pt)]

Stephan

On 2 Jan 2026, at 00:20, marta zhango <martazhango@xxxxxxxxx> wrote:

I want to describe that font attributes are dependent upon three things -
fontset, faces, and overlays. How can I write this in TLA?

Perhaps like this

FontAttris(point) \def
\E face \in ActiveFaces(point),
\E overlay \in OverlaysAt(point),
\E charset \in Fontset(point)
or

FontFaceAttributes(font-at(point)) = faces(pt) ^ Overlays(pt) ^ Fontset(pt)

or
□ (FontAttrs(pt) ∈ Faces(pt) × Overlays(pt) × Fontset(pt))
How can I approach this?

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