Hello,
I'm rather new using OpenSCAD and now I have a problem to convert a certain
type of string to a special array.
it would be nice if someone can help me.
The background: because with OpenSCAD customizer its only possible to edit
strings and not arrays, with more than 1Dim,
I try to convert a string form a field in customizer to a group of arrays,
so that this can be further handeld by OpenScad.
The result should be a group of arrays like in "ArrTest"
Here is my Example-code:
/echo("---- Example conv. string to group of array -----");

// this string has to be converted to group of arrays:
// String can be changed in customizer
String="[1,2,3];[4,5,6];[7,8,9]";

// result, like it must be,but not editable in customizer
ArrTest=[[1,2,3],[4,5,6],[7,8,9]];

echo("ArrTest:",ArrTest);
echo("len(ArrTest): ",len(ArrTest));

ArrNew=[for(i=[0:len(ArrTest)-1]) ArrTest[i]];
echo("ArrNew:",ArrNew);
echo("Single Element: ArrNew[0][0]:",ArrNew[0][0]);

// the result of conversion, but not fully parameterized
ArrNewOk=[for(i=[0:len(ArrTest)-1])
[ArrTest[i][0],ArrTest[i][1],ArrTest[i][2]]];
echo("ArrNewOk(but 2nd part w.numbers not dyn.):",ArrNewOk);

// false Tries
ArrTry1=[for(i=[0:len(ArrTest)-1]) for(j=[0:2])
[ArrTest[i][j],ArrTest[i][j],ArrTest[i][j]]];
echo("ArrTry1(wrong):",ArrTry1);

ArrTry2=[for(i=[0:len(ArrTest)-1]) for(j=[0:2]) [ArrTest[i][j]]] ;
echo("ArrTry2(wrong):",ArrTry2);
/

"String": this string that can be changed in customizer
"ArrTest": example-string of the resultingmust be converted in this form
with help of some ext.libs (strings and TOUL),  I have converted the
input-string to the form in "ArrNewOk".
I can select each array and each element of the arrays. Thats ok so far.
This form has the desired result, but the second element of the array has
numbers and not vars.
I cannot find a way to build up the second loop (without using brackets in
the for loop), so that the result is correct.
"ArrTry1" and "ArrtTry2" give all incorrect results.

Has anyone a hint to solve my problem?
Miguel

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Hang in there Moster, I'm almost there.
I went the hard way, but just had a thought of a simpler way, depending.

Are you too fussed on internals?
Given it is three groups, separated by ';' of 3 numbers, separated by ',',
and various '[]'.
Are you OK with ',' instead of ';' (ie "[1,2,3],[4,5,6],[7,8,9]")?
I can just extracted 9 numbers, then return them as a vector of three
vectors as you specified is that ok?
I would ignore any '[' & ']' (thus having 9 numbers separated by ',')
Just makes it a bit simpler & concise code.

Either way, as I'm close on the original '...];[...' solution.

Noting that there is no syntax checking.

OpenSCAD Admin - email* me if you need anything,  or if I've done something stupid...

• on the Forum, click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

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Hi Michael,
thx for your answer.
yes, a possible input in form of [1,2,3],[1,2,3].. would be optimal. I had
choosen the separator ";" only because customizer isn't capable to handle it
as input. I need only tese group of arrays.
Meanwhile I have worked at a solution, what fits, but not nice and rather
complex, a nightmare to program for me, because at the end it has to be a
function. I used some code from your examples, Thanks a lot, and the lib
"strings.scad" from "16807" published on
thingiverse(https://www.thingiverse.com/thing:526023). I had choosen the
easier way and not to reinvent the wheel.
Here my result-code:

/include <strings.scad>
// string as input customizer
string="[1,2,3,3];[4,5,6,10]";
// the result is a coorect formatted group of array
aNew=str2arr(string);
echo(aNew);

//*****************************************************+
// function str2arr (string)
// concetanation from these code lines:
// remove brackets
/*
sShort=replace((replace(sFP_Holes, "[", "")), "]", "");
// number of Elements of the pseudo-StringArray, its format is string, ";"
as separator
aNumSep = split(sShort,";"); // result are 3 arrays with strings as element
// Elements of inner array als string
aNumSepInner = [for(i=[0:len(aNumSep)-1]) (split(aNumSep[i],","))];
// inner array, Element[0][0] as len-value, all Elements same dim.
arr = [for (i=[0:len(aNumSep)-1]) for(j=[0:len(aNumSepInner[0])-1])
(str2num(aNumSepInner[i][j]))];
// seperate array in Groups
aNew = array_group(arr,len(aNumSepInner[0]));
*/
function str2arr(string)=
array_group([for (i=[0:len(split((replace((replace(string, "[", "")), "]",
"")),";"))-1]) for(j=[0:len(([for(i=[0:len((split((replace((replace(string,
"[", "")), "]", "")),";")))-1]) (split((split((replace((replace(string, "[",
"")), "]", "")),";"))[i],","))])[0])-1])
(str2num(([for(i=[0:len((split((replace((replace(string, "[", "")), "]",
"")),";")))-1]) (split((split((replace((replace(string, "[", "")), "]",
"")),";"))[i],","))])[i][j]))],len([for(i=[0:len((split((replace((replace(string,
"[", "")), "]", "")),";")))-1]) (split((split((replace((replace(string, "[",
"")), "]", "")),";"))[i],","))][0]));

//********************************************************

function array_group(v, cnt=2, dflt=0) =
[for (i = [0:cnt:len(v)-1]) [for (j = [0:1:cnt-1]) default(v[i+j],
dflt)]];

// Function: default()
// Usage:
//  val = default(val, dflt);
// Topics: Undef Handling
// See Also: first_defined(), one_defined(), num_defined()
// Description:
//  Returns the value given as v if it is not undef.
//  Otherwise, returns the value of dflt.
// Arguments:
//  v = Value to pass through if not undef.
//  dflt = Value to return if v is undef.
function default(v,dflt=undef) = is_undef(v)? dflt : v;

// released to the public domain as "hex.scad", by MichaelAtOz
function str2num(h="0",i=-1) =
// convers a string of digits into a decimal number
i == -1
? str2num(h,i=len(h)-1)
:  i == 0
? decDigit(h[0])
: decDigit(h[i]) + 10*str2num(h,i-1);

function decDigit(d="") =
len(d) != 1 ? undef :
d[0] == "0" ? 0 :
d[0] == "1" ? 1 :
d[0] == "2" ? 2 :
d[0] == "3" ? 3 :
d[0] == "4" ? 4 :
d[0] == "5" ? 5 :
d[0] == "6" ? 6 :
d[0] == "7" ? 7 :
d[0] == "8" ? 8 :
d[0] == "9" ? 9 : (0/0); // 0/0=nan

//--------------------------------------

/

thanks and regards Miguel

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I have tried your hint, but cannot get the desired result?.
In easy words what the code should do, so it can be changed by customizer:
input: string="[1,2,3];[4,5,6];...
output: array=[[1, 2, 3 ], [4, 5, 6]...]

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Sorry, that is in regards to me coding a function to convert the string into the vector format you
want.

It doesn't happen automatically.

With ',' instead of ';' it is just easier to code it.

From: Moster [mailto:mostermann@gmx.de]
Sent: Mon, 24 May 2021 03:48
To: discuss@lists.openscad.org
Subject: [OpenSCAD] Re: search a solution converting special string to array for customizer

I have tried your hint, but cannot get the desired result?.
In easy words what the code should do, so it can be changed by customizer:
input: string="[1,2,3];[4,5,6];...
output: array=[[1, 2, 3 ], [4, 5, 6]...]

Sent from the OpenSCAD mailing http://forum.openscad.org/  list archive at Nabble.com.

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yes, the resulting function ist horrible. It takes so a long time because of
the high nested operations. As multiple code-lines its quick and easier to
understand, but if possible I need a function. I need this convertion in
multiple parts of the program.
I dont know how to build a function with multiple commands in OpenScad, so I
had clipped the commands together to a single one, to get a function. not
fine, I know.

the function should handle array group with same dimension:
[1,2,3],[4,5,6]... so that these can be expand or changed in their contents
(not in dimension). f.e. to chage it to [1,2,3],[10,12,23] in the
customizer.

The "golden" solution would be that it can also handle strings
[1,2,"text1"],[4,5,"text2"]..
I worked at this code actually, but its also this rather unmanageable
solution.

the aim of this is to expand and fully parametrize a program for creating
enclosures for electr. parts that was published at thingiverse: The Ultimate
Box Maker https://www.thingiverse.com/thing:1264391

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