[tw5] Re: use variable for macro param default

[Mohammad]

Added to TW-Scripts

On Friday, April 5, 2019 at 7:19:50 AM UTC+4:30, TonyM wrote:
>
> PS
>
> As Posted elsewhere this is the method I use for default parameters
>
> I often use a variation of this when making my own macros to allow it to 
> use current tiddler or another if provided. Basically it provides a default 
> of the current tiddler
>
> *However you could use this for any input parameter.*
>
> \define mymacro(tiddlername)
> <$set name=selected-tiddler value="$tiddlername$" emptyValue=<<
> currentTiddler>> >
> Action: <>
> 
> \end
>
> <>
> <>
>
> This also illustrates another design principal, I almost always write my 
> macros to operate on the current tiddler such that if placed in wikitext a 
> list without a variable set the macros operate on the changing current 
> tiddler, or it can be given a specific tiddler. If I use a variable in the 
> list it uses the currentTiddler and the list will not change the 
> currentTiddler value
>
> Regards
> Tony
>
> On Monday, April 1, 2019 at 9:40:08 PM UTC+11, TonyM wrote:
>>
>> S s
>>
>> Also in my request to format variables in the view widget, Jeremy points 
>> out plans to introduce a format operator into filters. This will allow 
>> variables passed into a filter to return a value in the set widget filter 
>> or triple curly braces method after further transformation.
>>
>> This is clearly indicating the further development of filters such that 
>> we can do more with variables including maths.
>>
>> Regards
>> Tony
>>
>>

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[tw5] Re: use variable for macro param default

[TonyM]

PS

As Posted elsewhere this is the method I use for default parameters

I often use a variation of this when making my own macros to allow it to 
use current tiddler or another if provided. Basically it provides a default 
of the current tiddler

*However you could use this for any input parameter.*

\define mymacro(tiddlername)
<$set name=selected-tiddler value="$tiddlername$" emptyValue=<<
currentTiddler>> >
Action: <>

\end

<>
<>

This also illustrates another design principal, I almost always write my 
macros to operate on the current tiddler such that if placed in wikitext a 
list without a variable set the macros operate on the changing current 
tiddler, or it can be given a specific tiddler. If I use a variable in the 
list it uses the currentTiddler and the list will not change the 
currentTiddler value

Regards
Tony

On Monday, April 1, 2019 at 9:40:08 PM UTC+11, TonyM wrote:
>
> S s
>
> Also in my request to format variables in the view widget, Jeremy points 
> out plans to introduce a format operator into filters. This will allow 
> variables passed into a filter to return a value in the set widget filter 
> or triple curly braces method after further transformation.
>
> This is clearly indicating the further development of filters such that we 
> can do more with variables including maths.
>
> Regards
> Tony
>
>

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[tw5] Re: use variable for macro param default

[TonyM]

S s

Also in my request to format variables in the view widget, Jeremy points out 
plans to introduce a format operator into filters. This will allow variables 
passed into a filter to return a value in the set widget filter or triple curly 
braces method after further transformation.

This is clearly indicating the further development of filters such that we can 
do more with variables including maths.

Regards
Tony

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[tw5] Re: use variable for macro param default

[Mohammad]

Yep, this gets the code more clear!

--Mohammad

On Monday, April 1, 2019 at 12:40:04 PM UTC+4:30, S. S. wrote:
>
> Mohammad,
>
> In a similar vein, there is a new filter operator set for release in the 
> next version 5.1.20: getvariable 
> 
>
> Cheers!
>
> On Sunday, March 31, 2019 at 7:52:49 PM UTC+7, Mohammad wrote:
>>
>> Thanks for clarification.
>> It is interesting.
>>
>> Best
>> Mohammad
>>
>

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[tw5] Re: use variable for macro param default

[S. S.]

Mohammad,

In a similar vein, there is a new filter operator set for release in the 
next version 5.1.20: getvariable 


Cheers!

On Sunday, March 31, 2019 at 7:52:49 PM UTC+7, Mohammad wrote:
>
> Thanks for clarification.
> It is interesting.
>
> Best
> Mohammad
>

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[tw5] Re: use variable for macro param default

[TonyM]

Mohammad,

This seems in fact to be like plane language and self documenting code. Written 
to be read, rather than simply demonstrate ones coding skills. Perhaps like 
basic vs c++ 

It seems to me with the broad audience tiddlywiki attracts, we should always 
code sharable material this way.

Thanks for that.
Tony

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[tw5] Re: use variable for macro param default

[Mohammad]

Hi Tony,
 Have a look at 
https://stackoverflow.com/questions/17930267/what-is-the-difference-between-syntax-and-semantics-of-programming-languages
and also Wikipewdia but in short!
Semantics is about the *meaning* of the sentence. It answers the questions: 
is this sentence valid? If so, what does the sentence mean?

For example I prefer the first piece of code below which create an aside


1.

  Epcot Center
  The Epcot Center is a theme park in Disney World, Florida.



2.

  Epcot Center
  The Epcot Center is a theme park in Disney World, Florida.


Solution one is much more meaningful, easier to understand and easier to 
maintain, while both solutions are syntactically correct!

Other resources: [[https://www.webopedia.com/TERM/S/semantics.html]]

In linguistics, semantics is the study of meanings. In computer science 
, the term is 
frequently used to differentiate the meaning of an instruction 
 from its format 
. The format, which covers 
the spelling of language  
components 
and the rules controlling how components are combined, is called the 
language's *syntax* . For 
example, if you misspell a command 
, it is a syntax error. If, 
on the other hand, you enter a legal command that does not make any sense 
in the current context, it is a semantic error.

--Mohammad



On Monday, April 1, 2019 at 2:39:54 AM UTC+4:30, TonyM wrote:
>
> Mohammad,
>
> you and others are often referring to symantic, can you share a definition 
> if possible. The term clashes in my mind with philosophy and natural 
> languages use of the word.
>
> Thanks
> Tony
>
>

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[tw5] Re: use variable for macro param default

[TonyM]

Mohammad,

you and others are often referring to symantic, can you share a definition if 
possible. The term clashes in my mind with philosophy and natural languages use 
of the word.

Thanks
Tony

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[tw5] Re: use variable for macro param default

[Mohammad]

Thanks for clarification.
It is interesting.

Best
Mohammad

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[tw5] Re: use variable for macro param default

[S. S.]

Mohammad,

Since we are using the parameter *c* as a variable, we have to define its 
value as a variable first.
So if we wanted to pass the value *red* to the parameter *c*, we first have 
to define the variable *red*.
In this case we give the variable *red* the value *red* also.
Then it will work, as shown below.

\define myhelper(h) 
\define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<$c$
>>/>

<$set name="variable_for_color" value="blue">
a <> b


<$set name="red" value="red">
c <> d


Results in HTML produced:
a  b

c  d


Regards.





On Sunday, March 31, 2019 at 7:28:16 PM UTC+7, Mohammad wrote:
>
> Why this does not work?
>
> <$set name="variable_for_color" value="blue">
> a <> b
>
> c <> d
> 
>
>
> It produces
>
>
>  a  b c  d 
> 
>
>
>
> On Sunday, March 31, 2019 at 3:49:19 PM UTC+4:30, S. S. wrote:
>>
>> RA,
>>
>> See if this works for you:
>> \define myhelper(h) 
>> \define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<
>> $c$>>/>
>>
>> <$set name="variable_for_color" value="blue">
>> a <> b
>> 
>>
>> Inspecting the underlying HTML gives:
>> 
>> a  b
>>
>> 
>>
>> Cheers
>>
>>
>> On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>>>
>>> Is it possible? I want to do something like this:
>>>
>>> \define mymacro(c:variable_for_color)   >> "color:variable_for_color"/>
>>>
>>> So, there are 3 questions here really: defining a variable before 
>>> defining a macro, using variable as a macro parameter default, and using 
>>> variable inside html tag.
>>>
>>

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[tw5] Re: use variable for macro param default

[Mohammad]

Also this is interesting

h=<<$c$>>



On Sunday, March 31, 2019 at 3:49:19 PM UTC+4:30, S. S. wrote:
>
> RA,
>
> See if this works for you:
> \define myhelper(h) 
> \define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<
> $c$>>/>
>
> <$set name="variable_for_color" value="blue">
> a <> b
> 
>
> Inspecting the underlying HTML gives:
> 
> a  b
>
> 
>
> Cheers
>
>
> On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>>
>> Is it possible? I want to do something like this:
>>
>> \define mymacro(c:variable_for_color)   > "color:variable_for_color"/>
>>
>> So, there are 3 questions here really: defining a variable before 
>> defining a macro, using variable as a macro parameter default, and using 
>> variable inside html tag.
>>
>

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[tw5] Re: use variable for macro param default

[Mohammad]

Hi S.S,
 Your solution teaches one new rule
A variable can be referenced as default value in a macro definition by its 
name
So: c:<> or c:$(varname)$ does not work
BUT
c:"varname" works!

Is this is bug or it is a rule?

--Mohammad


On Sunday, March 31, 2019 at 3:49:19 PM UTC+4:30, S. S. wrote:
>
> RA,
>
> See if this works for you:
> \define myhelper(h) 
> \define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<
> $c$>>/>
>
> <$set name="variable_for_color" value="blue">
> a <> b
> 
>
> Inspecting the underlying HTML gives:
> 
> a  b
>
> 
>
> Cheers
>
>
> On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>>
>> Is it possible? I want to do something like this:
>>
>> \define mymacro(c:variable_for_color)   > "color:variable_for_color"/>
>>
>> So, there are 3 questions here really: defining a variable before 
>> defining a macro, using variable as a macro parameter default, and using 
>> variable inside html tag.
>>
>

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[tw5] Re: use variable for macro param default

[Mohammad]

Why this does not work?

<$set name="variable_for_color" value="blue">
a <> b

c <> d



It produces


 a  b c  d 




On Sunday, March 31, 2019 at 3:49:19 PM UTC+4:30, S. S. wrote:
>
> RA,
>
> See if this works for you:
> \define myhelper(h) 
> \define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<
> $c$>>/>
>
> <$set name="variable_for_color" value="blue">
> a <> b
> 
>
> Inspecting the underlying HTML gives:
> 
> a  b
>
> 
>
> Cheers
>
>
> On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>>
>> Is it possible? I want to do something like this:
>>
>> \define mymacro(c:variable_for_color)   > "color:variable_for_color"/>
>>
>> So, there are 3 questions here really: defining a variable before 
>> defining a macro, using variable as a macro parameter default, and using 
>> variable inside html tag.
>>
>

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[tw5] Re: use variable for macro param default

[S. S.]

RA,

See if this works for you:
\define myhelper(h) 
\define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<$c$
>>/>

<$set name="variable_for_color" value="blue">
a <> b


Inspecting the underlying HTML gives:

a  b



Cheers


On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>
> Is it possible? I want to do something like this:
>
> \define mymacro(c:variable_for_color)"color:variable_for_color"/>
>
> So, there are 3 questions here really: defining a variable before defining 
> a macro, using variable as a macro parameter default, and using variable 
> inside html tag.
>

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[tw5] Re: use variable for macro param default

[Mohammad]

On Sunday, March 31, 2019 at 8:29:26 AM UTC+4:30, RA wrote:
>
> Is it possible? I want to do something like this:
>
> \define mymacro(c:variable_for_color)"color:variable_for_color"/>
>
> So, there are 3 questions here really: defining a variable before defining 
> a macro, using variable as a macro parameter default, and using variable 
> inside html tag.
>

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[tw5] Re: use variable for macro param default

[Mohammad]

This is not an elegant solution and not semantic, but works!

\define spanmac(text) 

$text$

\end

\define mymacro(c:"", text)  
<$list filter="[enlist[$c$ $(vc)$]limit[1]]" variable=myColor>
<>

\end



<$vars vc="red" >

;Test one, no color sent
:<>

;Test two
:<>



The vc has a default red color, so if you call the mymacro without c 
parameter, the default value here red is used!
If you pass c parameter, then it used! Try above code inside tiddlywiki.com

--Mohammad



On Sunday, March 31, 2019 at 10:15:44 AM UTC+4:30, RA wrote:
>
> Yes, but I'd like `c` to have a default value, and I'd like to define that 
> default not as a literal color value, but via a variable. Can you do that?
>
> On Saturday, March 30, 2019 at 10:12:41 PM UTC-7, Mohammad wrote:
>>
>> Why noy use something like this
>>
>> \define mymacro(c, text)   
>> 
>> $text$
>> \end
>>
>> Then use it as
>>
>> <>
>>
>>
>>
>>
>> On Sunday, March 31, 2019 at 8:29:26 AM UTC+4:30, RA wrote:
>>>
>>> Is it possible? I want to do something like this:
>>>
>>> \define mymacro(c:variable_for_color)   >> "color:variable_for_color"/>
>>>
>>> So, there are 3 questions here really: defining a variable before 
>>> defining a macro, using variable as a macro parameter default, and using 
>>> variable inside html tag.
>>>
>>

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[tw5] Re: use variable for macro param default

[RA]

Yes, but I'd like `c` to have a default value, and I'd like to define that 
default not as a literal color value, but via a variable. Can you do that?

On Saturday, March 30, 2019 at 10:12:41 PM UTC-7, Mohammad wrote:
>
> Why noy use something like this
>
> \define mymacro(c, text)   
> 
> $text$
> \end
>
> Then use it as
>
> <>
>
>
>
>
> On Sunday, March 31, 2019 at 8:29:26 AM UTC+4:30, RA wrote:
>>
>> Is it possible? I want to do something like this:
>>
>> \define mymacro(c:variable_for_color)   > "color:variable_for_color"/>
>>
>> So, there are 3 questions here really: defining a variable before 
>> defining a macro, using variable as a macro parameter default, and using 
>> variable inside html tag.
>>
>

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[tw5] Re: use variable for macro param default

[Mohammad]

Why noy use something like this

\define mymacro(c, text)   

$text$
\end

Then use it as

<>




On Sunday, March 31, 2019 at 8:29:26 AM UTC+4:30, RA wrote:
>
> Is it possible? I want to do something like this:
>
> \define mymacro(c:variable_for_color)"color:variable_for_color"/>
>
> So, there are 3 questions here really: defining a variable before defining 
> a macro, using variable as a macro parameter default, and using variable 
> inside html tag.
>

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