From: Hans Hagen <pragma@wxs.nl>
To: ntg-context@ntg.nl
Subject: Re: Trimming strings and Lua string.trim question
Date: Wed, 05 Mar 2014 09:24:08 +0100 [thread overview]
Message-ID: <5316DF28.3070300@wxs.nl> (raw)
In-Reply-To: <5316ABF3.5050302@rik.users.panix.com>
On 3/5/2014 5:45 AM, Rik Kabel wrote:
> I am trying to strip all leading and trailing whitespace from a string.
> I have tried two methods, neither of which is satisfactory.
>
> The first method uses \ignorespaces and \removeunwantedspaces. This
> fails to strip leading and trailing newlines.
>
> The second method uses the Lua string.strip function. The wiki description:
>
> Yields string with leading and trailing whitespace (spaces,
> horizontal and vertical tabs, newlines) removed
>
> suggests that this should do what I want, but I find that it removes
> internal whitespace as well as the leading and trailing whitespace.
>
> Can somebody suggest a better way of doing this?
>
> The following code demonstrates the problem:
>
> % macros=mkvi
> \starttexdefinition StringStrip #STRING
> \startluacode
> context(string.strip([==[#STRING]==]))
> \stopluacode
> \stoptexdefinition
> \long\def\test{
>
> This is a test. \quad
>
> And it has an unexpected result.
>
> With \tex{ignorespaces} and \tex{removeunwantedspaces}, the
> newlines remain.
>
> With Lua {\tt string.strip}, the \tex{quad} at the end of a
> paragraph is preserved, but the other internal whitespace
> (including newlines) is gone!
>
> }
> \starttext
> \subject{ignorespaces and removeunwantedspaces}
> ¦\ignorespaces\test\removeunwantedspaces¦
>
> \subject{Lua string.strip}
> ¦\StringStrip{\test}¦
> \stoptext
striplong
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next prev parent reply other threads:[~2014-03-05 8:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-05 4:45 Rik Kabel
2014-03-05 8:24 ` Hans Hagen [this message]
2014-03-05 15:07 ` Rik Kabel
2014-03-05 15:18 ` Wolfgang Schuster
2014-03-05 15:54 ` Wolfgang Schuster
2014-03-05 23:00 ` Rik Kabel
2014-03-06 10:38 ` Hans Hagen
2014-03-06 15:04 ` Rik Kabel
2014-03-06 15:27 ` Wolfgang Schuster
2014-03-05 16:28 ` Rik Kabel
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