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From: Gerben Wierda <gerben.wierda@rna.nl>
Newsgroups: gmane.comp.tex.context
Subject: Re: How do I handle strings with " characters in it
 in METAPOST?
Date: Sun, 29 Mar 2020 16:25:55 +0200
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We should move this to the thread

What alternative for scantokens( "btex " & texcommands & " etex=E2=80=9D)?=


I=E2=80=99ve put my vardef there. The calls to this vardef are created =
by lua code.

I need to fix two things: use a string variable to build a btex-etex =
construct and be able to use (almost) any character in that variable.=20

I can adapt the strings, if I know what I have to replace things with. I =
can manipulate the strings while still in lua. But if I change it and =
then via MP hand it to a \type{} statement in ConTeXt the replacement =
will be typeset literally. So, it will be pretty complex. If I drop the =
use of \type{} inside the btex-etex I have to =E2=80=98escape' =
everything that TeX doesn=E2=80=99t see as normal text catcode. That, =
again might play havoc with breaking words across lines later.

G

> On 29 Mar 2020, at 15:09, Wolfgang Schuster =
<wolfgang.schuster.lists@gmail.com> wrote:
>=20
> Gerben Wierda schrieb am 29.03.2020 um 15:06:
>>> On 29 Mar 2020, at 14:35, Wolfgang Schuster =
<wolfgang.schuster.lists@gmail.com =
<mailto:wolfgang.schuster.lists@gmail.com>> wrote:
>>>=20
>>> Gerben Wierda schrieb am 29.03.2020 um 14:30:
>>>>> On 29 Mar 2020, at 12:58, Wolfgang Schuster =
<wolfgang.schuster.lists@gmail.com =
<mailto:wolfgang.schuster.lists@gmail.com>> wrote:
>>>>>=20
>>>>> Gerben Wierda schrieb am 29.03.2020 um 12:52:
>>>>>> I am using MetaFun (Lua code) to create METAPOST commands from an =
XML file. One of the issues I am running into that in METAPOST I have to =
handle strings with " characters in them and METAPOST doesn=E2=80=99t =
like those. The argument using the string
>>>>>> Foo "Bar=E2=80=9D Foo
>>>>>=20
>>>>>     ^^^
>>>>>=20
>>>>> Use correct left quotation marks or \quotation{=E2=80=A6}.
>>>> I=E2=80=99m not hard coding the string, I=E2=80=99m reading it from =
an XML. So, whatever I do, I need to do it by manipulating the string.
>>>> E.g. if the string I read contains
>>>> Foo "Bar=E2=80=9D Foo
>>>> your suggestion means  I have to programmatically change that to
>>>> Foo \quotation{Bar} Foo
>>>> which is too complicated, given that I don=E2=80=99t have regular =
expression replace at my disposal.
>>>> I might be able to change al =E2=80=9C instances into something =
else by walking through the string and building a new one.
>>>=20
>>> Your example uses " before Bar and not =E2=80=9C which is the =
problem.
>> Yes, I am aware that that is my problem. It is just that I do not =
have the luxury to decide myself what will be put in the string. It must =
work for any string. So, I will have to be putting that string to \type =
and make sure that is used as the label.
>=20
> Does btex .. etex help or can't you change the strings and replace the =
quotation marks before you pass them to MetaPost?
>=20
> \starttext
>=20
> \startMPcode
> draw textext.urt("One");
> draw btex "Two" etex shifted (0,15);
> label.urt("Three",(0,30));
> label.urt(btex "Four" etex,(0,45));
> \stopMPcode
>=20
> \stoptext
>=20
> Wolfgang


--Apple-Mail=_8F6CDAE0-28C1-43E0-86EC-7E72EF6125AB
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">We =
should move this to the thread<div class=3D""><span style=3D"color: =
rgba(0, 0, 0, 0.85098); font-family: &quot;Helvetica Neue&quot;;" =
class=3D""><br class=3D""></span></div><div class=3D""><font =
face=3D"Helvetica Neue" class=3D""><span style=3D"color: rgba(0, 0, 0, =
0.85098);" class=3D"">What alternative for scantokens( "btex " &amp; =
texcommands &amp; " etex</span><span style=3D"caret-color: rgba(0, 0, 0, =
0.85098); color: rgba(0, 0, 0, 0.85098);" class=3D"">=E2=80=9D</span><span=
 style=3D"color: rgba(0, 0, 0, 0.85098);" =
class=3D"">)?</span></font></div><div class=3D""><font face=3D"Helvetica =
Neue" class=3D""><span style=3D"caret-color: rgba(0, 0, 0, 0.85098); =
color: rgba(0, 0, 0, 0.85098);" class=3D""><br =
class=3D""></span></font></div><div class=3D""><font face=3D"Helvetica =
Neue" class=3D""><span style=3D"caret-color: rgba(0, 0, 0, 0.85098); =
color: rgba(0, 0, 0, 0.85098);" class=3D"">I=E2=80=99ve put my vardef =
there. The calls to this vardef are created by lua =
code.</span></font></div><div class=3D""><font face=3D"Helvetica Neue" =
class=3D""><span style=3D"caret-color: rgba(0, 0, 0, 0.85098); color: =
rgba(0, 0, 0, 0.85098);" class=3D""><br =
class=3D""></span></font></div><div class=3D""><font face=3D"Helvetica =
Neue" class=3D""><span style=3D"caret-color: rgba(0, 0, 0, 0.85098); =
color: rgba(0, 0, 0, 0.85098);" class=3D"">I need to fix two things: use =
a string variable to build a btex-etex construct and be able to use =
(almost) any character in that variable.&nbsp;</span></font></div><div =
class=3D""><font face=3D"Helvetica Neue" class=3D""><span =
style=3D"caret-color: rgba(0, 0, 0, 0.85098); color: rgba(0, 0, 0, =
0.85098);" class=3D""><br class=3D""></span></font></div><div =
class=3D""><font face=3D"Helvetica Neue" class=3D""><span =
style=3D"caret-color: rgba(0, 0, 0, 0.85098); color: rgba(0, 0, 0, =
0.85098);" class=3D"">I can adapt the strings, if I know what I have to =
replace things with. I can manipulate&nbsp;the strings while still in =
lua. But if I change it and then via MP hand it to a \type{} statement =
in ConTeXt the replacement will be typeset literally. So, it will be =
pretty complex. If I drop the use of \type{} inside the&nbsp;btex-etex I =
have to&nbsp;=E2=80=98escape' everything that TeX doesn=E2=80=99t see =
as&nbsp;normal text&nbsp;catcode.&nbsp;That, again might play havoc with =
breaking words across lines later.</span></font></div><div =
class=3D""><font face=3D"Helvetica Neue" class=3D""><span =
style=3D"caret-color: rgba(0, 0, 0, 0.85098); color: rgba(0, 0, 0, =
0.85098);" class=3D""><br class=3D""></span></font></div><div =
class=3D""><font face=3D"Helvetica Neue" class=3D""><span =
style=3D"caret-color: rgba(0, 0, 0, 0.85098); color: rgba(0, 0, 0, =
0.85098);" class=3D"">G<br class=3D""></span></font><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On 29 =
Mar 2020, at 15:09, Wolfgang Schuster &lt;<a =
href=3D"mailto:wolfgang.schuster.lists@gmail.com" =
class=3D"">wolfgang.schuster.lists@gmail.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D"">Gerben=
 Wierda schrieb am 29.03.2020 um 15:06:<br class=3D""><blockquote =
type=3D"cite" class=3D""><blockquote type=3D"cite" class=3D"">On 29 Mar =
2020, at 14:35, Wolfgang Schuster &lt;<a =
href=3D"mailto:wolfgang.schuster.lists@gmail.com" =
class=3D"">wolfgang.schuster.lists@gmail.com</a> &lt;<a =
href=3D"mailto:wolfgang.schuster.lists@gmail.com" =
class=3D"">mailto:wolfgang.schuster.lists@gmail.com</a>&gt;&gt; =
wrote:<br class=3D""><br class=3D"">Gerben Wierda schrieb am 29.03.2020 =
um 14:30:<br class=3D""><blockquote type=3D"cite" class=3D""><blockquote =
type=3D"cite" class=3D"">On 29 Mar 2020, at 12:58, Wolfgang Schuster =
&lt;<a href=3D"mailto:wolfgang.schuster.lists@gmail.com" =
class=3D"">wolfgang.schuster.lists@gmail.com</a> &lt;<a =
href=3D"mailto:wolfgang.schuster.lists@gmail.com" =
class=3D"">mailto:wolfgang.schuster.lists@gmail.com</a>&gt;&gt; =
wrote:<br class=3D""><br class=3D"">Gerben Wierda schrieb am 29.03.2020 =
um 12:52:<br class=3D""><blockquote type=3D"cite" class=3D"">I am using =
MetaFun (Lua code) to create METAPOST commands from an XML file. One of =
the issues I am running into that in METAPOST I have to handle strings =
with " characters in them and METAPOST doesn=E2=80=99t like those. The =
argument using the string<br class=3D"">Foo "Bar=E2=80=9D Foo<br =
class=3D""></blockquote><br class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;^^^<br =
class=3D""><br class=3D"">Use correct left quotation marks or =
\quotation{=E2=80=A6}.<br class=3D""></blockquote>I=E2=80=99m not hard =
coding the string, I=E2=80=99m reading it from an XML. So, whatever I =
do, I need to do it by manipulating the string.<br class=3D"">E.g. if =
the string I read contains<br class=3D"">Foo "Bar=E2=80=9D Foo<br =
class=3D"">your suggestion means &nbsp;I have to programmatically change =
that to<br class=3D"">Foo \quotation{Bar} Foo<br class=3D"">which is too =
complicated, given that I don=E2=80=99t have regular expression replace =
at my disposal.<br class=3D"">I might be able to change al =E2=80=9C =
instances into something else by walking through the string and building =
a new one.<br class=3D""></blockquote><br class=3D"">Your example uses " =
before Bar and not =E2=80=9C which is the problem.<br =
class=3D""></blockquote>Yes, I am aware that that is my problem. It is =
just that I do not have the luxury to decide myself what will be put in =
the string. It must work for any string. So, I will have to be putting =
that string to \type and make sure that is used as the label.<br =
class=3D""></blockquote><br class=3D"">Does btex .. etex help or can't =
you change the strings and replace the quotation marks before you pass =
them to MetaPost?<br class=3D""><br class=3D"">\starttext<br =
class=3D""><br class=3D"">\startMPcode<br class=3D"">draw =
textext.urt("One");<br class=3D"">draw btex "Two" etex shifted =
(0,15);<br class=3D"">label.urt("Three",(0,30));<br =
class=3D"">label.urt(btex "Four" etex,(0,45));<br =
class=3D"">\stopMPcode<br class=3D""><br class=3D"">\stoptext<br =
class=3D""><br class=3D"">Wolfgang<br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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