_sass-inherit.scss

// * css-inherit-fn/_sass-inherit.scss
// * BSD 2-Clause License
// * Copyright (c) Jane Ori, PropJockey, 2022

@mixin buildDepthSelector($evenOdd, $sel, $maxDepth) {
  $full: "";
  $selX: $sel;
  $i: 1;
  @if $evenOdd == "even" {
    $selX: $selX + " " + $sel;
    $i: 2;
  }
  @while $i <= $maxDepth {
    $full: $full + $selX + ":not(";
    $selX: $selX + " " + $sel;
    $full: $full + $selX + "), ";
    $selX: $selX + " " + $sel;
    $i: $i + 2;
  }
  :where(#{$full}) {
    @content
  }
}

@mixin __inheritchainswap($ioA, $ioB, $assignments) {
  $arglen: length($assignments);
  $i: 1;
  @while $i <= $arglen {
    $assignment: nth($assignments, $i);
    $index: str-index($assignment, ":");
    $var: str-slice($assignment, 1, $index - 1);
    $val: str-slice($assignment, $index + 1, -1);
    @if str-slice($val, 1, 1) == " " {
      $val: str-slice($val, 2, -1);
    }
    $index: str-index($val, "inherit(--");
    @while $index {
      $before: str-slice($val, 1, $index - 1);
      $after: str-slice($val, $index + 10, -1);
      $val: $before + "var(--" + $ioA + $after;
      $index: str-index($val, "inherit(--");
    }
    #{$var}: unquote($val);
    #{str-insert($var, $ioB, 3)}: var(unquote($var));
    $i: $i + 1;
  }
}

@mixin buildInherit($sel, $maxDepth, $assignments...) {
  @include buildDepthSelector("odd", $sel, $maxDepth) {
    @include __inheritchainswap("io1_", "io2_", $assignments);
  }
  @include buildDepthSelector("even", $sel, $maxDepth) {
    @include __inheritchainswap("io2_", "io1_", $assignments);
  }
}