stylint/src/checks/checkForEfficiency.js

A linter for stylus

'use strict';

// check for 0 0 0 0 or 50px 0 50px 0 type mistakes
module.exports = function checkForEfficiency( line, arr ) {
    if ( typeof line !== 'string' || typeof arr === 'undefined') { return; }

    // filter the array from the line with all white space removed
    arr = arr.filter(function( str ) {
        return str.length > 0;
    });

    // if margin or padding we run the tests
    if ( arr[0] === 'margin' ||
        arr[0] === 'padding' ||
        arr[0] === '\tmargin' ||
        arr[0] === '\tpadding' ) {

        // if line is potentially inefficient it needs to be at least this long
        if ( arr.length > 2 ) {
            // ex: margin 0 5px
            if ( arr.length === 3 ) {
                // ex margin 0 0
                if ( arr[1] === arr[2] )  {
                    return false;
                }
                else {
                    return true;
                }
            }
            // ex margin 0 5px 10px
            else if ( arr.length === 4 ) {
                // ex margin 0 5px 0
                if ( arr[1] === arr[3] ) {
                    return false;
                }
                else {
                    return true;
                }
            }
            // ex margin 0 50px 10px 7px
            else if ( arr.length === 5 ) {
                // ex margin 0 5px 0 5px
                if ( arr[1] === arr[3] && arr[2] === arr[4] ) {
                    return false;
                }
                // ex margin 0 5px 5px 5px
                else if ( arr[1] !== arr[3] && arr[2] === arr[4] ) {
                    return false;
                }
                else {
                    return true;
                }
            }
        }
        else {
            return true;
        }
    }
}