codenothing/CSSCompressor

var CSSCompressor = global.CSSCompressor;

function Stats( compressor ) {
    var self = this, now = Date.now();

    if ( ! ( self instanceof Stats ) ) {
        return new Stats( compressor );
    }

    // Setup
    self.compressor = compressor;
    self.time = {
        start: now,
        end: now,
        length: 0
    };
    self.before = {
        size: 0,
        selectors: 0,
        properties: 0
    };
    self.after = {
        size: 0,
        selectors: 0,
        properties: 0
    };
}

Stats.prototype = {

    // Start of compression
    start: function( time ) {
        var self = this, compressor = self.compressor;

        self.time.start = time;
        CSSCompressor.extend( self.before, {
            size: compressor.original.length,
            selectors: self._selectorCount( compressor.branches ),
            properties: self._propertyCount( compressor.branches )
        });
    },

    // End of compression
    end: function(){
        var self = this,
            now = Date.now(),
            compressor = self.compressor;

        self.time.end = now;
        self.time.length = self.time.end - self.time.start;
        CSSCompressor.extend( self.after, {
            size: compressor.css.length,
            selectors: self._selectorCount( compressor.branches ),
            properties: self._propertyCount( compressor.branches )
        });
    },

    // Counting selectors for stats
    _selectorCount: function( branches ) {
        var self = this, count = branches.length;

        branches.forEach(function( branch ) {
            if ( branch.branches ) {
                count += self._selectorCount( branch.branches );
            }
        });

        return count;
    },

    // Counting properties
    _propertyCount: function( branches ) {
        var self = this, count = 0;

        branches.forEach(function( branch ) {
            if ( branch.rules ) {
                count += branch.rules.length;
            }

            if ( branch.branches ) {
                count += self._propertyCount( branch.branches );
            }
        });

        return count;
    }

};


CSSCompressor.Stats = Stats;