Get a variable name as a string - sass

Question

I have a class with the name .text-black, I also have a map with some values.
$black: #000;
map:
dark: $black;
I want to loop through this map and create a new class with the $key and then extend they new class with using the value text-black.
There are 2 problems I have. The first I think I have solved, if I can get the $value as $black instead of #000. Then I can remove the $ using string replacement.
The second challenge however is proving a headache for me. I need to get $black in stead of #000.
Here is my code showing my approach so far.
// String Replacement to remove '$' from varaible name.
#function str-replace($string, $search, $replace: '') {
$index: str-index($string, $search);
#if $index {
#return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace)
}
#return $string;
}
// get color from map
#function text-color($key: "weekly-digest") {
#return map-get($text-colors, $key);
}
$black: #000000;
// map text-colors
$text-colors: () !default;
$text-colors: map-merge(
(
"news": $black,
),
$text-colors
);
// Extendable classes.
.text-black{
color: $black;
}
// Loop function
#each $name, $value in $text-colors {
&--#{$name} {
background-color: $value;
#extend .text-#{$value} // This should return '.text-black' not '.text-#000000'
}
}

Answer 1

I try to give you 3 different solutions. In all these solutions I used 2 colors (black & red) only to see if they could work in combination:
1. Using a function str-split() (maybe the most intricated, but use your code)
I found a magical function that splits a string in 2 elements How to split a string into two lists of numbers in SASS?.
So my idea is to use that function (thanks to #dayenite: if you like this solution, please upvote him ;)) in a string using a character (in my example "_") to split your maps in 3 different value (something like 2 keys and 1 value):
1. "news"
2. "black"
3. "#000"
Your map could become something like this:
$text-colors: map-merge(
(
"news_black":$black,
"info_red": $red
),
$text-colors
);
This is all the code in action:
#function str-split($string, $separator) {
// empty array/list
$split-arr: ();
// first index of separator in string
$index : str-index($string, $separator);
// loop through string
#while $index != null {
// get the substring from the first character to the separator
$item: str-slice($string, 1, $index - 1);
// push item to array
$split-arr: append($split-arr, $item);
// remove item and separator from string
$string: str-slice($string, $index + 1);
// find new index of separator
$index : str-index($string, $separator);
}
// add the remaining string to list (the last item)
$split-arr: append($split-arr, $string);
#return $split-arr;
}
/* Example with 2 colors */
$black: #000000;
$red: #ff0000;
$text-colors: () !default;
$text-colors: map-merge(
(
"news_black":$black,
"info_red": $red //my add
),
$text-colors
);
// Extendable classes.
.text-black{
color: $black;
}
.text-red{
color: $red;
}
// Loop function
.my-div{
#each $name, $value in $text-colors {
$list: (); // Create every time an empty list with my 2 argoments, for example "news" and "black"
$split-values: str-split($name, "_"); //use the function to split the string
#each $valore in $split-values {
$list: append($list, str-split($valore, " "));
}
//set here the first part of the string (i.e. news/info)
&--#{nth($list, 1)} {
background-color: $value;
#extend .text-#{nth($list, 2)} // set here the second part: black/red
}
}
}
https://www.sassmeister.com/gist/08f699dba4436d3bae6a4d8b666e815b
2. Using a nested list
This time I created a simple nested list with 3 value ("news", "black", $black), the result is the same.
$black: #000000;
$red: #ff0000;
// list text-colors
$text-colors: (
( "news", "black", $black ),
( "info", "red", $red )
);
// Extendable classes.
.text-black{
color: $black;
}
.text-red{
color: $red;
}
.mydiv{
// Loop function
#each $item in $text-colors {
&--#{nth($item, 1)} {
background-color: nth($item, 3);
#extend .text-#{nth($item, 2)}
}
}
}
https://www.sassmeister.com/gist/59adf5ee60ea46dd7a24e94d7db91d85
3. Using a nested map
Here I use nested maps, but the structure is different from yours and I don't know if it's ok for you.
$black: #000000;
$red: #ff0000;
// map text-colors
$text-colors: (
news:(black: $black),
info:(red: $red)
);
.text-black{
color: $black;
}
.text-red{
color: $red;
}
.mydiv{
// Loop function
#each $name, $value in $text-colors {
&--#{$name} {
#each $name-color, $value-color in $value {
background-color: $value-color;
#extend .text-#{$name-color}
}
}
}
}
https://www.sassmeister.com/gist/8ddec08755befc84f6e4846fbc625130
Well, I haven't another ideas. I hope at least one way could help you to solve your problem.
Cheers :)