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Message-ID: <8b8380f8-fcaa-483b-bfd8-dfc4cf554d6e@rik.users.panix.com>
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From: Rik Kabel <ConTeXt@rik.users.panix.com>
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Subject: [NTG-context] Low-level macro help needed
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Hello Hans and developers,

I have been trying to convert some two- and three-step macros (as shown=20
below) to single-step macros using the LMTX syntax given in the=20
low-level macros manual. I have succeeded in many cases, but failed when=20
the macro follows one particular group of patterns.

The group of patterns is similar to this macro to process

    \MyMacro[optional]{Required}{Required}{Optional}

In this the number of arguments can be 2, 3, or 4.

A three-step solution might be as follows, which I use for a list of=20
persons:

    \defineregister[Bindex]
    \setupregister [Bindex][n=3D1,
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 bal=
ance=3Dno,
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 met=
hod=3Ddefault, % or New follows Newton!
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 com=
press=3Dno, % yes if not note number+q
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 exp=
ansion=3Dyes,
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pag=
ecommand=3D\gobbleoneargument
     =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ]

    \starttexdefinition unexpanded Bi
     =C2=A0 \dosingleempty\doBindex
    \stoptexdefinition

    \starttexdefinition unexpanded doBindex [#SORTAS]#INDEXED
     =C2=A0 \def\SortAs{#SORTAS}%
     =C2=A0 \def\Indexed{#INDEXED}%
     =C2=A0 \dodoublegroupempty\doBindexFull
    \stoptexdefinition

    \starttexdefinition doBindexFull #BD#MORE
     =C2=A0 \doifemptyelse{#MORE}
     =C2=A0=C2=A0=C2=A0 {\Bindex[\SortAs]{\Indexed\ #BD}}
     =C2=A0=C2=A0=C2=A0 {\Bindex[\SortAs]{\Indexed\ #BD\\ #MORE}}
    \stoptexdefinition

with input like:

    \Bi{Rumble, Walker}{1938|=E2=80=93|}%
    \Bi{Runia, David Theunis}{1951|=E2=80=93|}{Classicist}%
    \Bi{Rutherford, Ernest (Baron Rutherford of
    Nelson)}{1871|=E2=80=93|1937}{Physicist}%
    \Bi{Saenger, Paul}{1945|=E2=80=93|}%
    \Bi{Saldarini, Anthony J.}{1941|=E2=80=93|2001}%
    \Bi{Salter, William M.}{1853|=E2=80=93|1931}%
    \Bi[Saint-Exupery]{de Saint-Exup=C3=A9ry, Antoine}{1900|=E2=80=93|194=
4}%
    \Bi{Santayana, George}{1863|=E2=80=93|1952}%
    \Bi{Sapir, Edward}{1884|=E2=80=93|1939}{Linguist}%
    \Bi[Schrodinger]{Schr=C3=B6dinger, Erwin}{1887|=E2=80=93|1961}{Physic=
ist}%
    \Bi[Spinoza]{de Spinoza, Baruch (Benedict de Spinoza, Bento de
    Espinosa)}{1632|=E2=80=93|1677}%

The best I can get with the newer syntax is a two-step:


    \starttexdefinition unexpanded Bi
     =C2=A0 \dosingleempty\doBindex
    \stoptexdefinition
    \tolerant\def\doBindex [#1]#=3D#=3D#=3D%
     =C2=A0 {\doifemptyelse{#4}
     =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3}}%
     =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3\\ #4}}%
     =C2=A0 }

In the low-level macros manual, near the end of chapter 2, it says that=20
some day there may be a use for #?, #!, #<, or #>. If I am not missing=20
something in the manual about how to provide that first optional=20
argument as an empty value, I think I have one. Could [#?] always return=20
a value (perhaps empty)? That would allow something like:

    \tolerant\def\doBindex [#?]#=3D#=3D#=3D%
     =C2=A0 {\doifemptyelse{#4}
     =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3}}%
     =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3\\ #4}}%
     =C2=A0 }

--=20
Rik



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    <meta http-equiv=3D"content-type" content=3D"text/html; charset=3DUTF=
-8">
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  <body>
    <p>Hello Hans and developers,</p>
    <p>I have been trying to convert some two- and three-step macros (as
      shown below) to single-step macros using the LMTX syntax given in
      the low-level macros manual. I have succeeded in many cases, but
      failed when the macro follows one particular group of patterns.</p>
    <p>The group of patterns is similar to this macro to process</p>
    <blockquote>
      <p>\MyMacro[optional]{Required}{Required}{Optional}</p>
    </blockquote>
    <p>In this the number of arguments can be 2, 3, or 4.</p>
    <p>A three-step solution might be as follows, which I use for a list
      of persons:</p>
    <blockquote>
      <p>\defineregister[Bindex]<br>
        \setupregister [Bindex][n=3D1,<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
balance=3Dno,<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
method=3Ddefault, % or New follows Newton!<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
compress=3Dno, % yes if not note number+q<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
expansion=3Dyes,<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
pagecommand=3D\gobbleoneargument<br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ]</p>
      <p>\starttexdefinition unexpanded Bi<br>
        =C2=A0 \dosingleempty\doBindex<br>
        \stoptexdefinition<br>
        <br>
        \starttexdefinition unexpanded doBindex [#SORTAS]#INDEXED<br>
        =C2=A0 \def\SortAs{#SORTAS}%<br>
        =C2=A0 \def\Indexed{#INDEXED}%<br>
        =C2=A0 \dodoublegroupempty\doBindexFull<br>
        \stoptexdefinition<br>
        <br>
        \starttexdefinition doBindexFull #BD#MORE<br>
        =C2=A0 \doifemptyelse{#MORE}<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[\SortAs]{\Indexed\ #BD}}<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[\SortAs]{\Indexed\ #BD\\ #MORE}}<br>
        \stoptexdefinition</p>
    </blockquote>
    <p>with input like:</p>
    <blockquote>
      <p>\Bi{Rumble, Walker}{1938|=E2=80=93|}%<br>
        \Bi{Runia, David Theunis}{1951|=E2=80=93|}{Classicist}%<br>
        \Bi{Rutherford, Ernest (Baron Rutherford of
        Nelson)}{1871|=E2=80=93|1937}{Physicist}%<br>
        \Bi{Saenger, Paul}{1945|=E2=80=93|}%<br>
        \Bi{Saldarini, Anthony J.}{1941|=E2=80=93|2001}%<br>
        \Bi{Salter, William M.}{1853|=E2=80=93|1931}%<br>
        \Bi[Saint-Exupery]{de Saint-Exup=C3=A9ry, Antoine}{1900|=E2=80=93=
|1944}%<br>
        \Bi{Santayana, George}{1863|=E2=80=93|1952}%<br>
        \Bi{Sapir, Edward}{1884|=E2=80=93|1939}{Linguist}%<br>
        \Bi[Schrodinger]{Schr=C3=B6dinger, Erwin}{1887|=E2=80=93|1961}{Ph=
ysicist}%<br>
        \Bi[Spinoza]{de Spinoza, Baruch (Benedict de Spinoza, Bento de
        Espinosa)}{1632|=E2=80=93|1677}%</p>
    </blockquote>
    <p>The best I can get with the newer syntax is a two-step:</p>
    <blockquote>
      <p><br>
        \starttexdefinition unexpanded Bi<br>
        =C2=A0 \dosingleempty\doBindex<br>
        \stoptexdefinition<br>
        \tolerant\def\doBindex [#1]#=3D#=3D#=3D%<br>
        =C2=A0 {\doifemptyelse{#4}<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3}}%<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3\\ #4}}%<br>
        =C2=A0 }<br>
      </p>
    </blockquote>
    <p>In the low-level macros manual, near the end of chapter 2, it
      says that some day there may be a use for #?, #!, #&lt;, or #&gt;.
      If I am not missing something in the manual about how to provide
      that first optional argument as an empty value, I think I have
      one. Could [#?] always return a value (perhaps empty)? That would
      allow something like:</p>
    <blockquote>
      <p>\tolerant\def\doBindex [#?]#=3D#=3D#=3D%<br>
        =C2=A0 {\doifemptyelse{#4}<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3}}%<br>
        =C2=A0=C2=A0=C2=A0 {\Bindex[#1]{#2\ #3\\ #4}}%<br>
        =C2=A0 }</p>
    </blockquote>
    <p>-- <br>
      Rik<br>
    </p>
    <p><br>
    </p>
    <p></p>
    <p><br>
    </p>
  </body>
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