Inserting a new text at given cursor position

Question

I am working on customizing the codemirror for my new language mode. As part of this new mode implementation, I am writing a new tool bar where user can select some text and

Answer 1

Improved function that, if selection present, replaces the text, if not, inserts in current cursor position

function insertString(editor,str){

        var selection = editor.getSelection();

        if(selection.length>0){
            editor.replaceSelection(str);
        }
        else{

            var doc = editor.getDoc();
            var cursor = doc.getCursor();

            var pos = {
               line: cursor.line,
               ch: cursor.ch
            }

            doc.replaceRange(str, pos);

        }

    }