Draw Function Call Graph With graphviz

I made simple program for drawing function call graph with GraphViz.

Result

Sample File

This is my sample source file. this syntax is for my company's in-house front-end engine. It's based on Javascript. as you know, Javascript is interpreter language so I read all text and extract function by using only substring, indexof and lastindexof.

scwin.a = function(a1, a2){
	...
	blah blah
	...
}


/* scwin.b()'s comment */
scwin.b = async function(b1, b2){
	// scwin.b blah blah
}

// scwin.c()'s comment
scwin.c = function(){
	
	var c = scwin.a(); /*scwin.a()'s comment*/
}

scwin.d = 
function(){
	var d = scwin.b(t,d);
	scwin.c();//scwin.c()'s comment
}

scwin.e = 
function(){
	/*scwin.e()'s comment*/
}

scwin.f = function(){
	scwin.a();
	scwin.b();
}

scwin.g = function(){
	scwin.f();
	scwin.i();
}

scwin.h = function(){
	scwin.b();
}

scwin.i = function(){
	scwin.h();
}

Core source code

When You click "Create Graph", this method is called. If you want to change the way of extracting functions and mapping functions, modify getFunctions and getFunctionMap method.

  public void drawGraph(String filePath, String fileName) {

        String textInFile = getFileText(filePath); // get text from source file.
        ArrayList<String> functions = getFunctions(textInFile); // get defined function
        HashMap<String,ArrayList<String>> functionMap = getFunctionMap(functions,textInFile);
        drawNode(functionMap,fileName); // draw graph
        
    }