create rectangles in ilustrator using dimensions from csv

Ouch!

There are so much ways to do this. But You need many "secure question" in the script - e.g. it is dependent of color mode, or swatches exists, or the installed language of Illustrator and so on …

Here is one "simple way" to work with three additional RGB color values columns in your txt file. Be sure that the color mode of your document is RGB.

// rectangleDraw_dataFromTxt.jsx
// regards pixxxelschubser

var aDoc = app.activeDocument;
var mm = 2.8346456;
// required: tab separated txt and opened RGB document in Illustrator (CS5+)
// see https://forums.adobe.com/message/7934424#7934424
// top    left    width    height    R    G    B
// 20    20    100    100    255    0    0

var aFile = File ("~/Desktop/Testdateien/topleftwidthheight.txt");
aFile.open("r");
var txtFile = aFile.read();
aFile.close();
var theText = txtFile.split("\n");
var T, rect, col;
var col = new RGBColor();

for (i=0; i<theText.length-1; i++) {
T=theText.split( "\t");

$.writeln(T[4]);
rect = aDoc.pathItems.rectangle( -(T[0] * mm), T[1] * mm, T[2] * mm, T[3] * mm );
col.red = T[4];
col.green = T[5];
col.blue = T[6];
rect.fillColor = col;
}

Have fun