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###lass_css LASS Writing CSS fails

://?.com/Shinmera/LASS/blame/master/README.md Examples

LASS supports two modes, one being directly in your lisp code, the other in pure LASS files. Adding LASS into your code is easy:

(lass:compile-and-write
 '(div
   :background black))

    "div{
        background: black;
    }"

LASS works on the following simple principles: A list is a block. The first argument in the list is a selector. The body of the list makes up the properties and sub-blocks. A property is started with a keyword that is used as the property name. Following is a bunch of property arguments until a new keyword, list, or the end is reached. A list inside a block is, again, a block with the twist that the parent block's selector is prepended to the sub-block's selector.

(lass:compile-and-write
 '(nav
   (ul
    :list-style none
    (li
     :margin 0 :padding 0
     :display inline-block)))))

    nav ul{
        list-style: none;
    }
    
    nav ul li{
        margin: 0;
        padding: 0;
        display: inline-block;
    }

Since LASS' COMPILE-SHEET simply takes a bunch of lists as its argument, you can use the backquote and comma to integrate variables from your lisp environment:

(let ((color "HWB(205.7 0% 6.7%)"))
  (lass:compile-and-write
   `(art
     :background ,color))))

    art{
        background: HWB(205.7 0% 6.7%);
    }

Alternatively however, and this is especially useful in pure LASS files, you can use the LET block to create LASS-specific bindings:

(lass:compile-and-write
 '(:let ((color "RGB(0, 136, 238)"))
   (art
    :background #(color))))

    art{
        background: RGB(0, 136, 238);
    }

LASS' selector mechanism is very flexible and allows for some complex logic to reduce duplication:

    (lass:compile-and-write
     '(article
       ((:or p blockquote)
        :margin 0 :padding 0
    
        (a
         :color black)
          
        ((:and a :hover)
         :color darkred))))

    article p, article blockquote{
        margin: 0;
        padding: 0;
    }
    
    article p a, article blockquote a{
        color: black;
    }
    
    article p a:hover, article blockquote a:hover{
        color: darkred;
    }

But it can go even further:

    (lass:compile-and-write
     '((:and
        (:or article section)
        (:= data-author (:or yukari ran chen))
        (:nth-child (:or 1 2 3)))
       :display none))

    "article[data-author=\"yukari\"]:nth-child(1),
     article[data-author=\"yukari\"]:nth-child(2),
     article[data-author=\"yukari\"]:nth-child(3),
     article[data-author=\"ran\"]:nth-child(1),
     article[data-author=\"ran\"]:nth-child(2),
     article[data-author=\"ran\"]:nth-child(3),
     article[data-author=\"chen\"]:nth-child(1),
     article[data-author=\"chen\"]:nth-child(2),
     article[data-author=\"chen\"]:nth-child(3),
     section[data-author=\"yukari\"]:nth-child(1),
     section[data-author=\"yukari\"]:nth-child(2),
     section[data-author=\"yukari\"]:nth-child(3),
     section[data-author=\"ran\"]:nth-child(1),
     section[data-author=\"ran\"]:nth-child(2),
     section[data-author=\"ran\"]:nth-child(3),
     section[data-author=\"chen\"]:nth-child(1),
     section[data-author=\"chen\"]:nth-child(2),
     section[data-author=\"chen\"]:nth-child(3){
        display: none;
    }"

Whoa nelly!

Some CSS properties are not fully specified yet and require browser-specific prefixes. LASS can help you with that, too:

    (lass:compile-and-write
     '(.fun
       :linear-gradient "deg(45)" black 0% darkgray 100%
       :transform rotate -45deg))

    .fun{
        background: -moz-linear-gradient(deg(45), black 0%, darkgray 100%);
        background: -o-linear-gradient(deg(45), black 0%, darkgray 100%);
        background: -webkit-linear-gradient(deg(45), black 0%, darkgray 100%);
        background: -ms-linear-gradient(deg(45), black 0%, darkgray 100%);
        background: linear-gradient(deg(45), black 0%, darkgray 100%);
        -moz-transform: rotate(-45deg);
        -o-transform: rotate(-45deg);
        -webkit-transform: rotate(-45deg);
        -ms-transform: rotate(-45deg);
        transform: rotate(-45deg);
    }

LASS also supports the various @QUERY operator blocks:

(lass:compile-and-write
 '(:media "(max-width: 800px)"
   (art
    :margin 0)))

    @media (max-width: 800px){
        art{
            margin: 0;
        }
    }

By default LASS activates pretty-printing and inserts newlines and spaces where appropriate in order to make the result readable and easy to debug. However, you can also deactivate that and directly produce minified CSS:

(let ((lass:*pretty* NIL))
  (lass:compile-and-write
   '(:media "(max-width: 800px)"
     (div
      :margin 0))))

    @media (max-width: 800px){div{margin:0;}}

As mentioned above you can write pure LASS files to compile down to a CSS file. To do that, simply M-x xah-fly-save-buffer-if-file

://?.com/Shinmera/LASS/blame/master/README.md