Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

@function to-string($value) {
  @return inspect(#{$value});
}
 
// general string replace functionality! what's next, regex?
// also providing a fourth argument will prefix it to returned string
@function str-replace($string, $remove, $replace, $accumulator: "") {
  $pos: str-index($string, $remove);
  @if $remove == "" {
    @warn "no argument provided for $remove";
  } @else if $replace == $remove {
    @return $string;
  } @else if $pos {
    $accumulator: $accumulator + str-slice($string, 1, $pos - 1) + $replace;
    $part2: str-slice($string, $pos + str-length($remove));
    @return str-replace($part2, $remove, $replace, $accumulator);
  }
  @return $accumulator + $string;
}

@function str-remove($string, $list...) {
  @for $i from 1 through length($list) {
    $string: str-replace($string, to-string(nth($list, $i)), "");
  }
  @return $string;
}

@function rm-sp($string, $replace: ""){
  @return str-replace($string, " ", $replace);
}

// you could almost do this without the accumulator but the final append
// is important for a proper list
@function str-explode($string, $separator, $list: ()){
  $index: str-index($string, $separator);
  @if $index == null {
    @return append($list, $string);
  }
  $l: length($separator);
  $list: append($list, str-slice($string, 1, $index - $l));
  $remaining: str-slice($string, $l + $index);
  @return str-explode($remaining, $separator, $list);
}

@function rm-last($list){
  @return set-nth($list, length($list), "");
}

@function get-last($list){
  @return nth($list, length($list))
}

//creates a string by removing commas and spaces from a list
@function flaten-list($list, $separator: ","){
  @return rm-sp(str-replace(to-string($list), $separator, ""));
};
 
//this one is borrowed from hugo giraudel


// START TRANSITIONER

// changes "#main .fa" to "main-subclass-fa-transition", for instance
// b/c sass can't extend nested selectors
@function to-placeholder-name($value){
  @return str-replace(
            str-replace(
              rm-sp($value, '-'), '.', 'subclass-'), '#', 'subid-')
          + "-transition";
}
 
// drops a placeholder for given element and transition
@mixin placeholder-transition($name, $transition) {
  %#{$name} { transition: #{$transition}; }
}
 
@mixin transitioner($selector, $transition, $root: false, $properties-root: false) {
  $transition: to-string($transition);
  $selector: to-string($selector);
  @at-root {
    $placeholder: to-placeholder-name($selector);
    $s-for-transition: $selector;
    $s-for-properties: $selector + &;
    @if str-index($transition, extend) {
      $placeholder: to-placeholder-name(str-slice($transition, 8));
    } @else {
      @include placeholder-transition($placeholder, $transition);
    }
    @if $root {
      $s-for-transition: $root $selector;
    }
    @if $properties-root {
      $s-for-properties: $properties-root $selector + &;
    }
    #{$s-for-transition} { @extend %#{$placeholder}; }
    #{$s-for-properties} { @content; }
  }
}

@mixin from($root: ""){
  @at-root{
    $x: str-replace(to-string(&), $properties-root, "");
    $added-class: "." + get-last(str-explode($x, "."));
    #{$root str-remove($x, $added-class)}{
      @content;
    }
  }
}

@mixin to(){
  @at-root{
    $selector: to-string(&);
    @if str-index($selector, ':'){
      // removes additional space if pseudo-selector is used
      $selector: str-replace($selector, " :", ":");
    }
    #{$selector}{ @content; }
  }
}

$root: ".block.left > #main";
$properties-root: ".left";

.full-height{
    @include transitioner("#inner .results", height 0.6s ease-in-out, $root, $properties-root){
        @include from($root){
          height:0px;
        }
        @include to(){
          height:100%;
        }
    }
}

SassMeister-output.css

.block.left > #main #inner .results {
  transition: height 0.6s ease-in-out;
}

.block.left > #main #inner .results {
  height: 0px;
}
.left #inner .results.full-height {
  height: 100%;
}