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From: Hans Hagen <pragma@wxs.nl>
To: ntg-context@ntg.nl
Subject: Re: Trimming strings and Lua string.trim question
Date: Thu, 06 Mar 2014 11:38:09 +0100	[thread overview]
Message-ID: <53185011.5070801@wxs.nl> (raw)
In-Reply-To: <5317ACAB.4050904@rik.users.panix.com>

On 3/6/2014 12:00 AM, Rik Kabel wrote:
> On 2014-03-05 10:54, Wolfgang Schuster wrote:
>>
>> Am 05.03.2014 um 16:18 schrieb Wolfgang Schuster
>> <schuster.wolfgang@gmail.com <mailto:schuster.wolfgang@gmail.com>>:
>>
>>>
>>> Am 05.03.2014 um 16:07 schrieb Rik Kabel <context@rik.users.panix.com
>>> <mailto:context@rik.users.panix.com>>:
>>>
>>>>> 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?
>>>
>>> The name of the function is “strings.striplong”.
>>
>> This should be “utilities.strings.striplong” but it has no effect
>> because when take a look
>> at the saved string in Lua you can see that blank lines are removed
>> from the text.
>>
>> Wolfgang
>
> Indeed. This does build without error, but the
> utilities.strings.striplong result is worse than the string.strip
> result, with some additional whitespace at the end of the test string
> from the earlier example.

the definition of 'worse' depends on expectations and given the fact 
that in tex a newline or two newlines in a row have a different meaning 
it is just a guess what you want to achieve

anyway, the next beta will have

local str = table.concat( {
"  ",
"    aap",
"  noot mies",
"  ",
"    ",
" zus    wim jet",
"zus    wim jet",
"       zus    wim jet",
"    ",
}, "\n")

utilities.strings.striplines(str,'prune'):

[[aap
noot mies


zus    wim jet
zus    wim jet
zus    wim jet]]

utilities.strings.striplines(str,'prune and collapse'):

[[aap
noot mies

zus    wim jet
zus    wim jet
zus    wim jet]]

utilities.strings.striplines(str,'prune and no empty'):

[[aap
noot mies
zus    wim jet
zus    wim jet
zus    wim jet]]

utilities.strings.striplines(str,'retain'):

[[
aap
noot mies


zus    wim jet
zus    wim jet
zus    wim jet
]]

utilities.strings.striplines(str,'retain and collapse'):

[[
aap
noot mies

zus    wim jet
zus    wim jet
zus    wim jet
]]

utilities.strings.striplines(str,'retain and no empty'):

[[
aap
noot mies
zus    wim jet
zus    wim jet
zus    wim jet
]]

so you can choose what you like

Hans




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  reply	other threads:[~2014-03-06 10:38 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
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 [this message]
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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