From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/86570 Path: news.gmane.org!not-for-mail From: Rik Kabel Newsgroups: gmane.comp.tex.context Subject: Re: Trimming strings and Lua string.trim question Date: Wed, 05 Mar 2014 10:07:10 -0500 Message-ID: <53173D9E.1050907@rik.users.panix.com> References: <5316ABF3.5050302@rik.users.panix.com> <5316DF28.3070300@wxs.nl> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0360684222==" X-Trace: ger.gmane.org 1394032046 9279 80.91.229.3 (5 Mar 2014 15:07:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 5 Mar 2014 15:07:26 +0000 (UTC) To: ntg-context@ntg.nl Original-X-From: ntg-context-bounces@ntg.nl Wed Mar 05 16:07:35 2014 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from balder.ntg.nl ([5.39.185.229]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WLDPt-0001TD-3p for gctc-ntg-context-518@m.gmane.org; Wed, 05 Mar 2014 16:07:29 +0100 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 75AE7101F3; Wed, 5 Mar 2014 16:07:28 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id GVknJmAxogNK; Wed, 5 Mar 2014 16:07:22 +0100 (CET) Original-Received: from balder.ntg.nl (localhost [IPv6:::1]) by balder.ntg.nl (Postfix) with ESMTP id 0ACBB101E3; Wed, 5 Mar 2014 16:07:22 +0100 (CET) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id CCC91101E3 for ; Wed, 5 Mar 2014 16:07:20 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id cofzSItDwojF for ; Wed, 5 Mar 2014 16:07:19 +0100 (CET) Original-Received: from filter4-til.mf.surf.net (filter4-til.mf.surf.net [194.171.167.220]) by balder.ntg.nl (Postfix) with ESMTP id 2530D101E1 for ; Wed, 5 Mar 2014 16:07:19 +0100 (CET) Original-Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89]) by filter4-til.mf.surf.net (8.14.3/8.14.3/Debian-9.4) with ESMTP id s25F7DvQ018496 for ; Wed, 5 Mar 2014 16:07:18 +0100 Original-Received: from [192.168.1.153] (adsl-98-77-175-214.mia.bellsouth.net [98.77.175.214]) by mailbackend.panix.com (Postfix) with ESMTP id B6C6D383CC for ; Wed, 5 Mar 2014 10:07:12 -0500 (EST) User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 In-Reply-To: <5316DF28.3070300@wxs.nl> X-Bayes-Prob: 0.0001 (Score 0, tokens from: ntg-context@ntg.nl, base:default, @@RPTN) X-CanIt-Geo: ip=166.84.1.89; country=US; region=NY; city=Richmond Hill; postalcode=11418; latitude=40.7005; longitude=-73.8345; metrocode=501; areacode=718; http://maps.google.com/maps?q=40.7005,-73.8345&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0VLxP7d39 - 118758d91020 - 20140305 (trained as not-spam) X-Scanned-By: CanIt (www . roaringpenguin . com) on 194.171.167.220 X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.14 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ntg-context-bounces@ntg.nl Original-Sender: ntg-context-bounces@ntg.nl Xref: news.gmane.org gmane.comp.tex.context:86570 Archived-At: This is a multi-part message in MIME format. --===============0360684222== Content-Type: multipart/alternative; boundary="------------030806050808050905040409" This is a multi-part message in MIME format. --------------030806050808050905040409 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 2014-03-05 03:24, Hans Hagen wrote: > 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=20 >> 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=3Dmkvi >> \starttexdefinition StringStrip #STRING >> \startluacode >> context(string.strip([=3D=3D[#STRING]=3D=3D])) >> \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} >> =A6\ignorespaces\test\removeunwantedspaces=A6 >> >> \subject{Lua string.strip} >> =A6\StringStrip{\test}=A6 >> \stoptext > > striplong > It would be nice if striplong worked, but the example fails when=20 string.striplong is used in place of string.strip. The log says: ! LuaTeX error [string "\directlua "]:1: attempt to call field 'striplong' (a nil value) stack traceback: [string "\directlua "]:1: in main chunk. Is the format of the call different than shown in the wiki, or is a=20 different mechanism required to quote a potentially long string? --=20 Rik --------------030806050808050905040409 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 2014-03-05 03:24, Hans Hagen wrote:
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


It would be nice if striplong worked, but the example fails when string.striplong is used in place of string.strip. The log says:

! LuaTeX error [string "\directlua "]:1: attempt to call field 'striplong' (a nil value)
stack traceback:
    [string "\directlua "]:1: in main chunk.
Is the format of the call different than shown in the wiki, or is a different mechanism required to quote a potentially long string?

--
Rik
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