library.js

////////////////////////////////
//
//   mySymbol class
//
////////////////////////////////


function rotate90(input){ input.unshift(input.pop()); } //shift array one to right so it follows CSS style borders

//accepts layer name or index
function MySymbol(input){
    this.doc = app.activeDocument;
    this.mySymbolIndex = input || 0; 
    this.mySymbolItem = this.hasSymbolIndex() ? this.doc.symbolItems[this.mySymbolIndex] : false;
    this.visibleBounds = this.mySymbolItem.visibleBounds;
    this.controlBounds = this.mySymbolItem.controlBounds; 
    // array of 4 numbers for position of bounding box 
    this.name = this.mySymbolItem.symbol.name;
    this.top = Math.abs(this.mySymbolItem.top);
    this.left = this.mySymbolItem.left;
    this.topLeft = [Math.abs(this.mySymbolItem.top), this.mySymbolItem.left];
} 

MySymbol.prototype.getPosition = function(top, left) {
    //if(topLeft) {
    var relativePositionTop = this.top - top;
    var relativePositionLeft= this.left - left;
    return [relativePositionTop, relativePositionLeft];
    //} else { return [this.top, this.left]; }
};

MySymbol.prototype.hasSymbolIndex = function() {
    return this.mySymbolIndex <= this.doc.symbolItems.length - 1;
};
MySymbol.prototype.getWidth = function() {
    return this.mySymbolItem ? Math.round(this.mySymbolItem.width) : 0;
};
MySymbol.prototype.getHeight = function() {
    return this.mySymbolItem ? Math.round(this.mySymbolItem.height) : 0;
};

// returns width and height as an array
MySymbol.prototype.getWidthHeight = function() { 
    return [this.getWidth(), this.getHeight()];
}

MySymbol.prototype.isIn = function(parentItem) {
    var isTrue,
        child = this.visibleBounds,
        parentVB = parentItem.visibleBounds,
        parentLeft = parentVB[0], parentTop = Math.abs(parentVB[1]), parentRight = parentVB[2], parentBottom = Math.abs(parentVB[3]);
 
    pointIsIn(parentLeft, parentTop, parentBottom, parentRight, child);
    function pointIsIn(parentLeft, parentTop, parentBottom, parentRight, child) {        
 
        if ( child[0] >= parentLeft && Math.abs(child[1]) >= parentTop && child[2] <= parentRight && Math.abs(child[3]) <= parentBottom) {
            //print("pass");
            isTrue = true;
            //return true;
        } else {
            //print("fail");
            isTrue = false;
            //return false;
       }
    }
    //print("is true? "+isTrue);
    if (isTrue){ return true; } 
}

// get symbol by name
MySymbol.prototype.getByName = function(nameString) {
    for (i=0; i<idoc.symbolItems.length; i++) // loop thru all symbol items in the active document
        {
            var symbolitem = idoc.symbolItems[i]; // get each symbol item
            if (symbolitem.symbol.name == nameString) { // check if it is an instance of "Apples" symbol
                symbolitem.selected = true; // if it is, then select it
            }
     }
} 


//////////////////////////
//write CSV
//////////////////////////

function CSVFile(fileName) {
    this.fileName = fileName;
}

CSVFile.prototype.getFilePath = function() {
    var inputFolder = Folder.selectDialog();
    return inputFolder + "/" + this.fileName + ".csv";
};

CSVFile.prototype.write = function(input, mode) {
    var csv = new File(this.getFilePath());
    csv.open(mode || "w"); // defaulted to write to file, also allows append
    csv.writeln(input); // write your new data to it
    csv.close(); // close csv
};

CSVFile.prototype.append = function(input) {
    this.write(input, "a"); // append to file
};

CSVFile.prototype.edit = function(input) {
   this.edit (input, "e"); //open in edit mode
   tabellaDoc.open("e");// open in edit mode
   tabellaDoc.seek(0, 2); // go to end of file
   var stringa = activeDocument.name + " , " + dataFormattata + " , "; 
   tabellaDoc.writeln(input); 
   tabellaDoc.close(); 
}

main.js

var pageItems = doc.layers.getByName("parent").pageItems,
    CSV = new CSVFile("Sass vars2"),
    canvasWidthHeight = ["CanvasSide", doc.width, doc.height];

CSV.append(canvasWidthHeight);

//for each "div" inside of the parent
for ( var i = 0; i < pageItems.length; i++ ) {
    var currentContainer = pageItems[i];
    var passedSymbolsWithInfo = [];
    
    // loop through all the symbols to check if it is in the div    
    for(var j = 0; j < doc.symbolItems.length; j++){
        var currentSymbol = new MySymbol(j);
        if(currentSymbol.isIn(currentContainer)) {
            var currentContainerTopLeft = [Math.abs(currentContainer.top), currentContainer.left];
            var symbolRelativeToParent = currentSymbol.getPosition(currentContainerTopLeft[0], currentContainerTopLeft[1]);
            var symbolInfo = [currentSymbol.getWidthHeight(), symbolRelativeToParent, currentSymbol.name, currentContainer.name];
            passedSymbolsWithInfo.push(symbolInfo);
        }
    }
    print(" ======== end SYMBOL ======== ");
    CSV.append(passedSymbolsWithInfo);
}
print("\n ====== end DEV ======== ");