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SassMeister-input.scss

// ----
// Sass (v3.3.7)
// Compass (v1.0.0.alpha.18)
// ----

// Handle Errors
//@include handle-error(test param, {accepted types or strings as spaced list}, {optional custom message as string});
@mixin handle-error($test, $testAgainst, $custom-message:null) {
  
  $string-match: false;
  $type-match: false;
  $message: null;
  
  @each $item in $testAgainst {
    @if ($item == $test) { $string-match:true;}
    @if (type-of($test) == $item) { $type-match:true;}
  }
  
  @if ($custom-message != null) {
    $message: $custom-message;
  }
  @else {
    $message: "The type of the passed variable is incorrent. expected:{#{$testAgainst}}, was:{#{$test} as #{type-of($test)}}";
  }
  
  @if ($string-match == false and $type-match == false) {
      @warn $message;
      // Included for test cases
      status:$message;
  }
  // Included for test cases
  @else {
      status:"ok!";
  }
}


// Example in Use
// ---------------------------------------------------------------------------
@mixin set-background($color) {
  background:$color;
  @include handle-error($color, color "transparent" );
}


// Test Cases
// ---------------------------------------------------------------------------
test-string-match-true {
  $param: "random-string";
  @include handle-error($param, number "random-string" );
}

test-string-match-false {
  $param: "random-string";
  @include handle-error($param, number "random-string-check" );
}

test-color-match-true {
  $param: #ffffff;
  @include handle-error($param, color);
}

test-color-match-true {
  $param: green;
  @include handle-error($param, color);
}

test-color-match-false {
  $param: newMadeupColor;
  @include handle-error($param, color);
}

test-custom-error-true {
  $param: blue ;
  @include handle-error($param, number, "This is a custom error!");
}

SassMeister-output.css

test-string-match-true {
  status: "ok!";
}

test-string-match-false {
  status: 'The type of the passed variable is incorrent. expected:{number "random-string-check"}, was:{random-string as string}';
}

test-color-match-true {
  status: "ok!";
}

test-color-match-true {
  status: "ok!";
}

test-color-match-false {
  status: "The type of the passed variable is incorrent. expected:{color}, was:{newMadeupColor as string}";
}

test-custom-error-true {
  status: "This is a custom error!";
}