Re: [NTG-context] Trimming strings and Lua string.trim question
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.wolfg...@gmail.com mailto:schuster.wolfg...@gmail.com:
Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@rik.users.panix.com
mailto:cont...@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,
,
,
zuswim jet,
zuswim jet,
zuswim jet,
,
}, \n)
utilities.strings.striplines(str,'prune'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'prune and collapse'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'prune and no empty'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'retain'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
utilities.strings.striplines(str,'retain and collapse'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
utilities.strings.striplines(str,'retain and no empty'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
so you can choose what you like
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] Trimming strings and Lua string.trim question
On 2014-03-06 05:38, Hans Hagen wrote:
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.wolfg...@gmail.com mailto:schuster.wolfg...@gmail.com:
Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@rik.users.panix.com
mailto:cont...@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,
,
,
zuswim jet,
zuswim jet,
zuswim jet,
,
}, \n)
utilities.strings.striplines(str,'prune'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'prune and collapse'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'prune and no empty'):
[[aap
noot mies
zuswim jet
zuswim jet
zuswim jet]]
utilities.strings.striplines(str,'retain'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
utilities.strings.striplines(str,'retain and collapse'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
utilities.strings.striplines(str,'retain and no empty'):
[[
aap
noot mies
zuswim jet
zuswim jet
zuswim jet
]]
so you can choose what you like
Hans
indeed, beauty is in the eye of the beholder.
Thank you for the flexible solution that allows each of us to find beauty.
Could you please ensure that this handles text in buffers the same way
that it handles other strings? I noticed that this is handled a bit
differently, as the following shows,but perhaps it is my clumsy coding.
The buffer result is closer to what I expect in terms of internal
whitespace, but still does not show expected trimming of leading and
trailing whitespace. That trimming, of course, is the point of the exercise.
\def\StringsStripLong#1%
{\ctxlua{context(utilities.strings.striplong([==[#1]==]))}}
\def\StringStrip#1%
{\ctxlua{context(string.strip([==[#1]==]))}}
\startbuffer[testbuffer]
B This is a test.
And it has an unexpected result.
\stopbuffer
\long\def\testmacro{
M This is a test.
And it has an unexpected result.
}
\starttext
\subject{Lua string.strip passed TeX buffer}
¦\StringStrip{\getbuffer[testbuffer]}¦
\subject{Lua string.strip passed TeX macro}
¦\StringStrip{\testmacro}¦
\subject{Lua utilities.strings.striplong passed TeX buffer}
¦\StringsStripLong{\getbuffer[testbuffer]}¦
\subject{Lua utilities.strings.striplong passed TeX macro}
¦\StringsStripLong{\testmacro}¦
\stoptext
--
Rik
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___
Re: [NTG-context] Trimming strings and Lua string.trim question
Am 06.03.2014 um 16:04 schrieb Rik Kabel cont...@rik.users.panix.com: Could you please ensure that this handles text in buffers the same way that it handles other strings? I noticed that this is handled a bit differently, as the following shows,but perhaps it is my clumsy coding. The buffer result is closer to what I expect in terms of internal whitespace, but still does not show expected trimming of leading and trailing whitespace. That trimming, of course, is the point of the exercise. This can’t work because \getbuffer is a unexpandable command and what you pass to Lua is the string \getbuffer[testbuffer] and not the content of the buffer. When you want to manipulate the content of a buffer you have to access the content at the Lua side with the buffers.getcontent(…) function. BTW: You don’t need \long in MkIV because definitions use it by default. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Trimming strings and Lua string.trim question
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
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Trimming strings and Lua string.trim question
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
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Trimming strings and Lua string.trim question
Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@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”. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Trimming strings and Lua string.trim question
Am 05.03.2014 um 16:18 schrieb Wolfgang Schuster schuster.wolfg...@gmail.com: Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@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 ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Trimming strings and Lua string.trim question
On 2014-03-05 10:18, Wolfgang Schuster wrote: Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@rik.users.panix.com mailto:cont...@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. Wolfgang Thank you, Wolfgang. I have updated the wiki entry for this function. I have not been able to verify that other functions are similarly misidentified in the wiki, and have therefore not updated any others. Those who are more familiar with the functions may wish to review it. -- Rik ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Trimming strings and Lua string.trim question
On 2014-03-05 10:54, Wolfgang Schuster wrote: Am 05.03.2014 um 16:18 schrieb Wolfgang Schuster schuster.wolfg...@gmail.com mailto:schuster.wolfg...@gmail.com: Am 05.03.2014 um 16:07 schrieb Rik Kabel cont...@rik.users.panix.com mailto:cont...@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. So, is this a confirmed bug? -- Rik ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
