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From: Gerben Wierda <gerben.wierda@rna.nl>
Newsgroups: gmane.comp.tex.context
Subject: Re: How do I get an empty line in a
 \framed[align=flushleft]{} item?
Date: Fri, 1 May 2020 01:44:37 +0200
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> On 30 Apr 2020, at 22:54, Wolfgang Schuster =
<wolfgang.schuster.lists@gmail.com> wrote:
>=20
> Gerben Wierda schrieb am 30.04.2020 um 22:47:
>> In normal TeX, when I type
>> Aap\\\\Aap
>> I get something like
>> Aap
>> Aap
>> But inside a \framed[align=3D]{} the empty line disappears. How do I =
get it back?
>> Minimal example:
>> \starttext
>> Testing\\\\Testing
>> \page
>> \framed[align=3Dflushleft]{Testing\\\\Testing}
>> \stoptext
>=20
> Use \blank

Too happy too soon. And I recall I ran into this earlier a while ago in =
another setting ago. But I thought of a solution.

Background:

I am automatically converting input from an XML file to =
METAPOST/ConTeXt. The input may contain one or more newlines.The text =
must end up in \framed[align=3D??, width=3D??] to be typeset.

I use lua to convert and make it safe to pass to METAPOST as a string =
argument that METAPOST can pass on to textext(), using the following =
function:

function doubleQuotableEscapedConTeXtString( str)
  local rep =3D lpeg.replacer {
   { '\n', '\\blank ' },
   { '{', '{\\textbraceleft}' },
   { '}', '{\\textbraceright}' },
   { '#', '{\\texthash}' },
   { '$', '{\\textdollar}' },
   { '&', '{\\textampersand}' },
   { '%', '{\\textpercent}' },
   { '\\','{\\textbackslash}' },
   { '|', '{\\textbar}' },
   { '_', '{\\textunderscore}' },
   { '~', '{\\textasciitilde}' },
   { '^', '{\\textasciicircum}' },
   { '"', "\"&ditto&\"" },
  }
  return rep:match(str)
end

Where it now says \\blank, it used to say \\\\.

Problem

\\\\ gets me what I want if there is one \n (it turns into one new =
line), but with two \n in succession it still gets me only a single =
=E2=80=99newline'
\\blank gets me what I want if there are multiple newlines, but gets me =
an extra empty line when I only want =E2=80=99next line=E2=80=99 and =
multiple \blanks do not work=20

But I found the solution by using \strut\\ instead of \blank. In the =
above table:

   { =E2=80=98\n', =E2=80=98\\strut\\\\' },

This fools ConTeXt in thinking there actually is something on that line =
and so multiple \\ will work.

G=

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	charset=utf-8

<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""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
30 Apr 2020, at 22:54, 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 30.04.2020 um 22:47:<br class=3D""><blockquote =
type=3D"cite" class=3D"">In normal TeX, when I type<br =
class=3D"">Aap\\\\Aap<br class=3D"">I get something like<br =
class=3D"">Aap<br class=3D"">Aap<br class=3D"">But inside a =
\framed[align=3D]{} the empty line disappears. How do I get it back?<br =
class=3D"">Minimal example:<br class=3D"">\starttext<br =
class=3D"">Testing\\\\Testing<br class=3D"">\page<br =
class=3D"">\framed[align=3Dflushleft]{Testing\\\\Testing}<br =
class=3D"">\stoptext<br class=3D""></blockquote><br class=3D"">Use =
\blank<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Too happy too soon. And I recall I ran into this =
earlier a while ago in another setting ago. But I thought of a =
solution.</div><div><br class=3D""></div><div>Background:</div><div><br =
class=3D""></div><div>I am automatically converting input from an XML =
file to METAPOST/ConTeXt. The input may contain one or more newlines.The =
text must end up in \framed[align=3D??, width=3D??] to be =
typeset.</div><div class=3D""><br class=3D""></div><div>I use lua to =
convert and make it safe to pass to METAPOST as a string argument that =
METAPOST can pass on to textext(), using the following =
function:</div><div><br class=3D""></div><div><div><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">function =
doubleQuotableEscapedConTeXtString( str)</span></font></div><div><span =
style=3D"font-family: Courier;" class=3D"">&nbsp; local rep =3D =
lpeg.replacer {</span></div><div><font face=3D"Courier" class=3D""><span =
style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ '\n', '\\blank ' =
},</span></font></div><div><span style=3D"font-family: Courier;" =
class=3D"">&nbsp; &nbsp;{ '{', '{\\textbraceleft}' =
},</span></div><div><font face=3D"Courier" class=3D""><span =
style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ '}', =
'{\\textbraceright}' },</span></font></div><div><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ =
'#', '{\\texthash}' },</span></font></div><div><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ =
'$', '{\\textdollar}' },</span></font></div><div><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ =
'&amp;', '{\\textampersand}' },</span></font></div><div><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; &nbsp;{ '%', '{\\textpercent}' =
},</span></font></div><div><font face=3D"Courier" class=3D""><span =
style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ =
'\\','{\\textbackslash}' },</span></font></div><div><font face=3D"Courier"=
 class=3D""><span style=3D"font-style: normal;" class=3D"">&nbsp; =
&nbsp;{ '|', '{\\textbar}' },</span></font></div><div><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; &nbsp;{ '_', '{\\textunderscore}' =
},</span></font></div><div><font face=3D"Courier" class=3D""><span =
style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ '~', =
'{\\textasciitilde}' },</span></font></div><div><font face=3D"Courier" =
class=3D""><span style=3D"font-style: normal;" class=3D"">&nbsp; &nbsp;{ =
'^', '{\\textasciicircum}' },</span></font></div><div><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">&nbsp; &nbsp;{ '"', "\"&amp;ditto&amp;\"" =
},</span></font></div><div><font face=3D"Courier" class=3D""><span =
style=3D"font-style: normal;" class=3D"">&nbsp; =
}</span></font></div><div><span style=3D"font-family: Courier;" =
class=3D"">&nbsp; return rep:match(str)</span></div><div><font =
face=3D"Courier" class=3D""><span style=3D"font-style: normal;" =
class=3D"">end</span></font></div><div><br =
class=3D""></div><div><div>Where it now says \\blank, it used to say =
\\\\.</div><div class=3D""><br =
class=3D""></div></div><div>Problem</div><div><br =
class=3D""></div><div>\\\\ gets me what I want if there is one \n (it =
turns into one new line), but with two \n in succession it still gets me =
only a single =E2=80=99newline'</div><div>\\blank gets me what I want if =
there are multiple newlines, but gets me an extra empty line when I only =
want =E2=80=99next line=E2=80=99 and multiple \blanks do not =
work&nbsp;</div><div><br class=3D""></div><div>But I found the solution =
by using \strut\\ instead of \blank. In the above table:</div><div><br =
class=3D""></div><div><div><div><font face=3D"Courier" class=3D"">&nbsp; =
&nbsp;{&nbsp;=E2=80=98\n',&nbsp;=E2=80=98\\strut\\\\' =
},</font></div><div class=3D""><div><br class=3D""></div></div><div =
class=3D"">This fools ConTeXt in thinking there actually is something on =
that line and so multiple \\ will work.</div><div class=3D""><br =
class=3D""></div><div =
class=3D"">G</div></div></div></div></div></body></html>=

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