Why won't my script work on all files in the folder?

Question

Hi, below is a script I hobbled together from various sources using the search function on this forum. It is supposed to change hyphens to en-dashes in a ai files in a folder. However, when I run it, it only works on one file. After it makes the change and closes the first file, it stops. Can anyone help me troubleshoot and fix the problem?
var destFolder, sourceFolder, files, fileType, sourceDoc, targetFile, pdfSaveOpts;
sourceFolder = Folder.selectDialog;
if ( sourceFolder != null )
    files = new Array();
    fileType = "*.ai";
    files = sourceFolder.getFiles( fileType );
    if ( files.length > 0 )
        destFolder = sourceFolder;
       for ( i = 0; i < files.length; i++ )
            sourceDoc = app.open(files[i]); // returns the document object
var active_doc = app.activeDocument;
var search_string = '-';
var replace_string = "\u2013";
var text_frames = active_doc.textFrames;
if (text_frames.length > 0)
    for (var i = 0 ; i < text_frames.length; i++)
          var this_text_frame = text_frames[i];
           var new_string = this_text_frame.contents.replace(search_string, replace_string);
           if (new_string != this_text_frame.contents)
                    this_text_frame.contents = new_string;
         sourceDoc.save();
         sourceDoc.close();

Answer 1

no easy way as you may wish, but not as difficult either. For eps files, you have to use SaveAs() method,
if ai - do save
if eps - do saveAs
here's a sample from the Documentation, or search the forum for other samples
// Exports current document to destFile as an EPS file with specified
// options, destFile contains the full path including the file name
function exportFileAsEPS (destFile) {
var newFile = new File(destFile);
var saveDoc;
if ( app.documents.length == 0 )
saveDoc = app.documents.add();
else
saveDoc = app.activeDocument;
var saveOpts = new EPSSaveOptions();
saveOpts.cmykPostScript = true;
saveOpts.embedAllFonts = true;
saveDoc.saveAs( newFile, saveOpts );