function processFile(blob, fileName) {
        loadScriptPromise('https://cdn.jsdelivr.net/npm/jszip@3.10.1/dist/jszip.min.js').then(function() {
            var reader = new FileReader();
            reader.onload = function(e) {
                JSZip.loadAsync(e.target.result).then(function(zip) {
                    // Apple Pages files are zip archives that embed a PDF preview.
                    // Newer iWork (>=2013): 'preview.pdf' at root.
                    // Older iWork ('09 / '11): 'QuickLook/Preview.pdf'.
                    var candidates = ['preview.pdf', 'QuickLook/Preview.pdf', 'Preview.pdf'];
                    var entry = null;
                    for (var i = 0; i < candidates.length; i++) {
                        entry = zip.file(candidates[i]);
                        if (entry) break;
                    }
                    if (!entry) {
                        // Fall back to a case-insensitive scan in case Apple changes casing.
                        zip.forEach(function(path, f) {
                            if (!entry && /(^|\/)preview\.pdf$/i.test(path)) entry = f;
                        });
                    }
                    if (!entry) {
                        alert('This .pages file does not contain an embedded PDF preview. Open it in Pages and re-save with “Include preview in document” enabled, then try again.');
                        return;
                    }
                    entry.async('blob').then(function(pdfBlob) {
                        var outBlob = new Blob([pdfBlob], { type: 'application/pdf' });
                        var outName = (fileName || 'document').replace(/\.pages$/i, '') + '.pdf';
                        add_file_output(URL.createObjectURL(outBlob), outName);
                    }).catch(function() { alert('Could not read the embedded PDF from this .pages file.'); });
                }).catch(function() {
                    alert('Could not read this .pages file. It may be password-protected or corrupted.');
                });
            };
            reader.onerror = function() { alert('Could not read this .pages file.'); };
            reader.readAsArrayBuffer(blob);
        }).catch(function() { alert('Could not load the conversion library.'); });
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}