Option sets: a .o target for shared parameters

A named group of optional parameters, declared once and used by several
klammers, so a writer learns one vocabulary instead of a spelling per
klammer.  The "o" target is a pseudo-target beside "k": "k" declares a
klammer's interface and documents it, "o" declares an option interface and
documents it, and neither produces output for any target.

    @@caption_args.o :caption :number.bool true :caption_side.side
    : Arguments that define a caption for a block element @@

    @@code.k :filename @hpos_args :hpos left @ @caption_args :caption_side top @
    | text.literal : A source file displayed verbatim @@

A set is used only in the parameter list of a ".k" declaration -- the one
place a klammer's interface is declared once for all of its targets -- and
is resolved as that list is read.  Names and types come from the set; a
default may be overridden where it is used.  A klammer application in a
parameter list is now a definition-time error.

The SKS gains the sets caption_args and hpos_args (:hpos and :offset), and
@table, @image, @image_grid, @reference and @show gain .k declarations.  A
distance is no longer written as a position: :hpos 4em is rejected, and the
same layout is :hpos left :offset 4em.  Code listings are numbered by
default, like tables and figures.

New engine sources mac/option_set{,_registry}.{h,cpp}; tst/ ships two more
suites, option_set_test.sh and signature_test.sh (twelve in all).

 (from dev 34e536cb0329)
This commit is contained in:
2026-08-06 13:11:37 +02:00
parent 4306dcd490
commit 6e7596ab2e
37 changed files with 2198 additions and 267 deletions

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@@ -1,3 +1,26 @@
#[
A paragraph is a document-structural object, like a section or a table of
contents, and making paragraphs is a service @document provides: inside a
@document, blank-line-separated text becomes paragraphs (the LaTeX
convention) and @par need not be written. @par is the explicit form, for
a text FRAGMENT rendered without a @document, where nothing infers them.
Written inside a @document it is harmless: html sees a <p>, which the
paragraph pass recognizes as a block and leaves alone, and \par in
vertical mode is a no-op.
]#
@@par.k s : A paragraph of text @@
@@par.html :: <p>*s*</p> @@
@@par.tex ::
\par
*s*
\par
@@
# In plain text a paragraph is delimited by blank lines, which
# phases.justify_blocks then fills; #/2 inserts them without depending on
# the definition body's own whitespace surviving extraction.
@@par.txt :: #/2*s*#/2 @@
@@sp.k : Non-breaking space character @@
@@sp.html :: &^#160; @@
@@sp.tex :: ~ @@