setExpressionToPaths.jsx

//setting one expression to all paths

var shapeWorksSetStrokeExpression = this;

shapeWorksSetStrokeExpression.go = function(expr){
    var activeComp = app.project.activeItem;
    if(activeComp && activeComp instanceof CompItem){
        var sel = activeComp.selectedLayers;
        if(sel.length > 0){
            for(var s = 0; s < sel.length; s++){
                if(sel[s] instanceof ShapeLayer){
                    $.writeln( sel[s].property("ADBE Root Vectors Group") instanceof PropertyGroup)
                    sel[s].property("ADBE Root Vectors Group").setStrokeExpression(expr);
                }
            }
        }
    }
}

PropertyGroup.prototype.setStrokeExpression = function(expr){
    if(this.property("ADBE Vector Graphic - Stroke")){
        //if we found a strokename
        this.property("ADBE Vector Graphic - Stroke").property("ADBE Vector Stroke Width").expression = expr;
    }
    else{
        for(var i=1;i<=this.numProperties;i++){
            var curProp=this.property(i);
            if(curProp instanceof PropertyGroup){
                curProp.setStrokeExpression(expr);
            }
        }
    }
}

AVLayer.prototype.findEffectByName = function(_name){
  //looks for an effect with given name inside given layer
  var eff = this.property("ADBE Effect Parade");
  for(var e = 1; e <= eff.numProperties; e++){
    if(eff.property(e).name == _name) return eff.property(e);
  }
  return null;
}

AVLayer.prototype.setSlider = function(_name, _value, _expression){
  //adding a slider to the layer
  var sl = this.property("ADBE Effect Parade").addProperty("ADBE Slider Control");
  sl.name = _name;
  sl.property("ADBE Slider Control-0001").setValue(_value);
  sl.property("ADBE Slider Control-0001").expression = _expression;

  return sl
}



shapeWorksSetStrokeExpression.go();