Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.4)
// Compass (v1.0.1)
// ----

// LIB
// -------------------------------------------------------------------------

// 1. Check if the value maps to one of our keywords and if so, swap out the value
@function core-parse-value-filter($value){
  @return $value;
}

// 2. Check if the resolved value is unitless. If so multiply the value by the rhythm
// unit we are using
@function core-lookup-value-filter($value){
  @return $value;
}

@mixin padding-top($value) {
  
  @if core-should-parse-value($value) {
    $value: core-parse-value-filter($value);
    $value: core-lookup-value-filter($value);
  }
  
  padding-top: #{$value};
}

// CORE
// -------------------------------------------------------------------------

$core-valid-unitless-values: "auto" "initial" "inherit" 0;

@function core-should-parse-value($value){
  @return core-is-valid-unitless($value) or core-is-number_with_unit($value);
}

@function core-is-valid-unitless($value) {
  @return not not index($core-valid-unitless-values, $value);
}

@function core-is-number_with_unit($value) {
  @return not (type-of($value) == "number" and not unitless($value));
}

.Default {
  @include padding-top(10px);
}

// APP
// -------------------------------------------------------------------------

$rhythm-units-map: (
  single: 1,
  double: 2,
  triple: 3,
  quadruple: 4,
  half: 0.5,
  third: 0.33333333333,
  quarter: 0.25
);

$rhythm-map: (
  vertical: 10px,
  horizontal: 14px
);

@function core-parse-value-filter($key){
  @if map-has-key($rhythm-units-map, $key) {
    @return map-get($rhythm-units-map, $key);
  } @else {
    @error 'Unsupported key';
  }
}

@function core-lookup-value-filter($value){
  @return $value;
}

.Lookup {
  @include padding-top(single);
}

SassMeister-output.css

.Default {
  padding-top: 10px;
}

.Lookup {
  padding-top: 1;
}