scss

  1. scss
    1. Description
    2. Author
    3. Documentation
      1. Syntax
      2. Emitter
      3. scss2css
    4. Examples
      1. Basic
      2. More Complex
      3. SCSS Plus
    5. License

Description

An implementation of the s-expression based CSS notation SCSS. It slightly modifies and extends the original implementation of the WebIt! (site seems defunct) framework.

Author

Moritz Heidkamp

Documentation

Only the emitter side is implemented at the moment.

Syntax

stylesheet ::= (css <import-clause>* <rule>+)

import-clause ::= (import <string>)

rule ::= (<complex-selector> <declaration>+)

complex-selector ::= <single-selector> |
                     <grouping-selector>

simple-selector ::= <symbol> |
                    (= class <symbol>) |
                    (= class <simple-selector> <symbol>) |
                    (= pclass <symbol>) |
                    (= pclass <simple-selector> <symbol>) |
                    (= id <symbol>) |
                    (= id <simple-selector> <symbol>)

path-selector ::= (<combinator> <single-selector>+)

combinator ::= // | + | >

single-selector ::= <simple-selector> |
                    <path-selector>

grouping-selector ::= (<single-selector>+)

declaration ::= (<symbol> <scheme-expression>) |
                (! (<symbol> <scheme-expression>))

Alternatively the following extended syntax dubbed SCSS Plus is available:

stylesheet ::= (css+ <import-clause>* <rule>+)

import-clause ::= (import <string>)

rule ::= (<complex-selector> [<declaration> | <nested-rule>]+)

nested-rule ::= (<path-selector> [<declaration> | <nested-rule>]+)

complex-selector ::= <single-selector> |
                     <grouping-selector>

simple-selector ::= <symbol> |
                    (= class <symbol>) |
                    (= class <simple-selector> <symbol>) |
                    (= pclass <symbol>) |
                    (= pclass <simple-selector> <symbol>) |
                    (= id <symbol>) |
                    (= id <simple-selector> <symbol>)

path-selector ::= (<combinator> <single-selector>+)

combinator ::= // | + | > | &

single-selector ::= <simple-selector> |
                    <path-selector>

grouping-selector ::= (<single-selector>+)

declaration ::= (<symbol> <scheme-expression>) |
                (! (<symbol> <scheme-expression>))

The two differences are that you can nest rules which results in much more compact stylesheets as well as use the & combinator which will concatenate nested selectors.

Emitter

[procedure] (scss->css scss [port])

Write the CSS translation of scss (which is a list following the syntax described under Syntax) to port.

scss2css

scss2css is a program that is installed with this egg. It takes a file name argument which should contain an SCSS document. If no file name is given it will read from standard input instead. The document will be read and evaled. The result of that is passed to scss->css which in turn writes the resulting CSS to standard output. When the -n option is passed the document won't be evaled.

Examples

Basic

(scss->css '(css (p (text-align center))))

=>

p { text-align: center } 

More Complex

(scss->css '(css (((= class p note) (+ p p))
                  (font-style italic)
                  (background-color "#ccc"))
                 (|#content| 
                  (width 100em))))

=>

p.note, p + p { font-style: italic; background-color: #ccc }
#content { width: 100em }

SCSS Plus

(scss->css '(css+ ((= id main)
                   (display block)
                   ((// p)
                    (font-size 1em)
                    ((& .error)
                     (! (color red)))))))

=>

#main { display: block }
#main p { font-size: 1em }
#main p.error { color: red !important }

License

 Copyright (c) 2010-2012, Moritz Heidkamp
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 
 3. Neither the name of the <organization> nor the
    names of its contributors may be used to endorse or promote products
    derived from this software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.