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From: "Rudd, Kevin" <kevin@lps.umd.edu>
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Subject: MP keyword function: string parameters no longer
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Date: Wed, 21 Jul 2021 16:51:53 +0000
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Thread-Topic: MP keyword function: string parameters no longer accept string
 variables directly
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Hi---

Here's another apparent change on the MP side---for keyword functions, stri=
ng parameters no longer accept string variables directly. They do seem to r=
egister them (hasparameter =3D> true) but don't capture the value (getparam=
eter =3D> 0). Thus:

system          > ConTeXt  ver: 2021.07.16 22:03 LMTX  fmt: 2021.7.21  int:=
 english/english

metapost        > trace > This is MPLIB for LuaMetaTeX, version 3.11, runni=
ng in scaled mode.
metapost        > trace >
metapost        > trace > loading metafun for lmtx, including the plain 1.0=
04 base definitions
metapost        > trace >
metapost        > trace > >> "string constant fuschia ..."
metapost        > trace > >> true
metapost        > trace > >> "fuschia"
metapost        > trace > >> "string variable fuschia =3D fuschia ..."
metapost        > trace > >> true
metapost        > trace > >> 0
metapost        > trace > >> "expression containing string variable fuschia=
 =3D fuschia ..."
metapost        > trace > >> true
metapost        > trace > >> "fuschia"

String constant: succeeds
String variable: fails
String expression with string variable: succeeds

Here's the MWE:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% system          > ConTeXt  ver: 2021.07.16 22:03 LMTX  fmt: 2021.7.21  in=
t: english/english

\startMPdefinitions

    presetparameters "parameters_Test"
    [
    ]

    def Test =3D
        applyparameters "parameters_Test" "do_Test"
    enddef;

    def do_Test =3D
        pushparameters "parameters_Test";
        show hasparameter "color";
        show getparameter "color";
    enddef;

\stopMPdefinitions

\starttext

hello

\startalignment[center]
    \startplacefigure
        \startMPcode
            string fuschia; fuschia =3D "fuschia";

            show "string constant fuschia ...";
            Test [ color =3D "fuschia" ];

            show "string variable fuschia =3D " & fuschia & " ...";
            Test [ color =3D  fuschia  ];

            show "expression containing string variable fuschia =3D " & fus=
chia & " ...";
            Test [ color =3D  "" & fuschia  ];

        \stopMPcode
    \stopplacefigure
\stopalignment

goodbye

\stoptext

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


Kevin W. Rudd, Ph.D.
CAPT, USN (Ret)

Computer Architecture & Computer Engineering
Advanced Computing Systems (ACS) Research Program
Laboratory for Physical Sciences (LPS)

443-654-7878
kevin@lps.umd.edu<mailto:kevin@lps.umd.edu>

Visiting Research Professor
United States Naval Academy

rudd@usna.edu<mailto:rudd@usna.edu>



--_000_0604A08239474F0AB31DBB72F96F4C37lpsumdedu_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break:=
 after-white-space;" class=3D"">
Hi---
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Here's another apparent change on the MP side---for&nbsp;ke=
yword functions, string parameters no longer accept string variables direct=
ly. They do seem to register them (hasparameter =3D&gt; true) but don't cap=
ture the value (getparameter =3D&gt; 0). Thus:</div>
<div class=3D""><br class=3D"">
</div>
<blockquote style=3D"margin: 0 0 0 40px; border: none; padding: 0px;" class=
=3D"">
<div class=3D"">
<div class=3D"">system &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&gt; ConTeXt &nbsp=
;ver: 2021.07.16 22:03 LMTX &nbsp;fmt: 2021.7.21 &nbsp;int: english/english=
</div>
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; This is=
 MPLIB for LuaMetaTeX, version 3.11, running in scaled mode.</div>
</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt;&nbsp;</=
div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; loading=
 metafun for lmtx, including the plain 1.004 base definitions</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt;&nbsp;</=
div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; &quot;string constant fuschia ...&quot;</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; true</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; &quot;fuschia&quot;</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; &quot;string variable fuschia =3D fuschia ...&quot;</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; true</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; 0</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; &quot;expression containing string variable fuschia =3D fuschia ...&quot;=
</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; true</div>
</div>
<div class=3D"">
<div class=3D"">metapost &nbsp; &nbsp; &nbsp; &nbsp;&gt; trace &gt; &gt;&gt=
; &quot;fuschia&quot;</div>
</div>
</blockquote>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">String constant: succeeds</div>
<div class=3D"">String variable: fails</div>
<div class=3D"">String expression with string variable: succeeds</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Here's the MWE:</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%=
%%%%%%%%%%%%%</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">
<div class=3D"">
<div class=3D"">% system &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&gt; ConTeXt &nb=
sp;ver: 2021.07.16 22:03 LMTX &nbsp;fmt: 2021.7.21 &nbsp;int: english/engli=
sh</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">\startMPdefinitions</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; presetparameters &quot;parameters_Test&quot;<=
/div>
<div class=3D"">&nbsp; &nbsp; [</div>
<div class=3D"">&nbsp; &nbsp; ]</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; def Test =3D</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; applyparameters &quot;parameter=
s_Test&quot; &quot;do_Test&quot;</div>
<div class=3D"">&nbsp; &nbsp; enddef;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; def do_Test =3D</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; pushparameters &quot;parameters=
_Test&quot;;</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; show hasparameter &quot;color&q=
uot;;</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; show getparameter &quot;color&q=
uot;;</div>
<div class=3D"">&nbsp; &nbsp; enddef;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">\stopMPdefinitions</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">\starttext</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">hello</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">\startalignment[center]</div>
<div class=3D"">&nbsp; &nbsp; \startplacefigure</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; \startMPcode</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string fuschia; f=
uschia =3D &quot;fuschia&quot;;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; show &quot;string=
 constant fuschia ...&quot;;</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Test [ color =3D =
&quot;fuschia&quot; ];</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; show &quot;string=
 variable fuschia =3D &quot; &amp; fuschia &amp; &quot; ...&quot;;</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Test [ color =3D =
&nbsp;fuschia &nbsp;];</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; show &quot;expres=
sion containing string variable fuschia =3D &quot; &amp; fuschia &amp; &quo=
t; ...&quot;;</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Test [ color =3D =
&nbsp;&quot;&quot; &amp; fuschia &nbsp;];</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; \stopMPcode</div>
<div class=3D"">&nbsp; &nbsp; \stopplacefigure</div>
<div class=3D"">\stopalignment</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">goodbye</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">\stoptext</div>
</div>
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">
<div class=3D"">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%=
%%%%%%%%%%%%%</div>
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><br class=3D"">
<div class=3D"">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break: =
after-white-space;" class=3D"">
<div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; text-align: start; text-indent: 0px; text-transform: none=
; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
Kevin W. Rudd, Ph.D.<br class=3D"">
CAPT, USN (Ret)<br class=3D"">
<br class=3D"">
Computer Architecture &amp;&nbsp;Computer Engineering&nbsp;<br class=3D"">
Advanced Computing&nbsp;Systems (ACS) Research&nbsp;Program&nbsp;<br class=
=3D"">
Laboratory for Physical&nbsp;Sciences (LPS)&nbsp;<br class=3D"">
<br class=3D"">
443-654-7878&nbsp;<br class=3D"">
<a href=3D"mailto:kevin@lps.umd.edu" class=3D"">kevin@lps.umd.edu</a></div>
<div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; text-align: start; text-indent: 0px; text-transform: none=
; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<br class=3D"">
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; text-align: start; text-indent: 0px; text-transform: none=
; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
Visiting Research Professor<br class=3D"">
United States Naval Academy<br class=3D"">
<br class=3D"">
<a href=3D"mailto:rudd@usna.edu" class=3D"">rudd@usna.edu</a><br class=3D""=
>
<br class=3D"">
</div>
</div>
</div>
<br class=3D"">
</div>
</body>
</html>

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