System.register(["src/external/dexie.js", "src/client/strings.js", "systemjs-babel-build", "src/client/ContextJS/src/contextjs.js", "src/client/files.js", "src/client/paths.js", "babel-plugin-syntax-jsx", "babel-plugin-syntax-do-expressions", "babel-plugin-syntax-function-bind", "babel-plugin-syntax-async-generators", "src/client/bibliography.js", "src/external/bibtexParse.js", "src/client/markdown.js", "src/external/diff-match-patch.js", "utils"], function (_export, _context) {
  "use strict";

  var Dexie, Strings, babelDefault, cop, Files, Paths, babelPluginSyntaxJSX, babelPluginSyntaxDoExpressions, babelPluginSyntaxFunctionBind, babelPluginSyntaxGenerators, Bibliography, BibtexParser, Markdown, diff, wait;
  return {
    setters: [function (_srcExternalDexieJs) {
      Dexie = _srcExternalDexieJs.default;
    }, function (_srcClientStringsJs) {
      Strings = _srcClientStringsJs.default;
    }, function (_systemjsBabelBuild) {
      babelDefault = _systemjsBabelBuild.default;
    }, function (_srcClientContextJSSrcContextjsJs) {
      cop = _srcClientContextJSSrcContextjsJs;
    }, function (_srcClientFilesJs) {
      Files = _srcClientFilesJs.default;
    }, function (_srcClientPathsJs) {
      Paths = _srcClientPathsJs.default;
    }, function (_babelPluginSyntaxJsx) {
      babelPluginSyntaxJSX = _babelPluginSyntaxJsx.default;
    }, function (_babelPluginSyntaxDoExpressions) {
      babelPluginSyntaxDoExpressions = _babelPluginSyntaxDoExpressions.default;
    }, function (_babelPluginSyntaxFunctionBind) {
      babelPluginSyntaxFunctionBind = _babelPluginSyntaxFunctionBind.default;
    }, function (_babelPluginSyntaxAsyncGenerators) {
      babelPluginSyntaxGenerators = _babelPluginSyntaxAsyncGenerators.default;
    }, function (_srcClientBibliographyJs) {
      Bibliography = _srcClientBibliographyJs.default;
    }, function (_srcExternalBibtexParseJs) {
      BibtexParser = _srcExternalBibtexParseJs.default;
    }, function (_srcClientMarkdownJs) {
      Markdown = _srcClientMarkdownJs.default;
    }, function (_srcExternalDiffMatchPatchJs) {
      diff = _srcExternalDiffMatchPatchJs.default;
    }, function (_utils) {
      wait = _utils.wait;
    }],
    execute: function () {
      const __SystemJSRewritingHack = {};
      _recorder_._src_client_fileindex_js = _recorder_._src_client_fileindex_js || {};
      Object.defineProperty(_recorder_._src_client_fileindex_js, "getBaseURL", {
        get() {
          return getBaseURL;
        },

        set(thisIsVererySecretVariableName) {
          getBaseURL = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Dexie", {
        get() {
          return Dexie;
        },

        set(thisIsVererySecretVariableName) {
          Dexie = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Strings", {
        get() {
          return Strings;
        },

        set(thisIsVererySecretVariableName) {
          Strings = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babelDefault", {
        get() {
          return babelDefault;
        },

        set(thisIsVererySecretVariableName) {
          babelDefault = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });

      const babel = babelDefault.babel;
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babel", {
        get() {
          return babel;
        },

        set(thisIsVererySecretVariableName) {
          babel = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "cop", {
        get() {
          return cop;
        },

        set(thisIsVererySecretVariableName) {
          cop = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Files", {
        get() {
          return Files;
        },

        set(thisIsVererySecretVariableName) {
          Files = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Paths", {
        get() {
          return Paths;
        },

        set(thisIsVererySecretVariableName) {
          Paths = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babelPluginSyntaxJSX", {
        get() {
          return babelPluginSyntaxJSX;
        },

        set(thisIsVererySecretVariableName) {
          babelPluginSyntaxJSX = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babelPluginSyntaxDoExpressions", {
        get() {
          return babelPluginSyntaxDoExpressions;
        },

        set(thisIsVererySecretVariableName) {
          babelPluginSyntaxDoExpressions = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babelPluginSyntaxFunctionBind", {
        get() {
          return babelPluginSyntaxFunctionBind;
        },

        set(thisIsVererySecretVariableName) {
          babelPluginSyntaxFunctionBind = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "babelPluginSyntaxGenerators", {
        get() {
          return babelPluginSyntaxGenerators;
        },

        set(thisIsVererySecretVariableName) {
          babelPluginSyntaxGenerators = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Bibliography", {
        get() {
          return Bibliography;
        },

        set(thisIsVererySecretVariableName) {
          Bibliography = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "BibtexParser", {
        get() {
          return BibtexParser;
        },

        set(thisIsVererySecretVariableName) {
          BibtexParser = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "Markdown", {
        get() {
          return Markdown;
        },

        set(thisIsVererySecretVariableName) {
          Markdown = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "diff", {
        get() {
          return diff;
        },

        set(thisIsVererySecretVariableName) {
          diff = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });


      const dmp = new diff.diff_match_patch();

      Object.defineProperty(_recorder_._src_client_fileindex_js, "dmp", {
        get() {
          return dmp;
        },

        set(thisIsVererySecretVariableName) {
          dmp = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      const syntaxPlugins = [babelPluginSyntaxJSX, babelPluginSyntaxDoExpressions, babelPluginSyntaxFunctionBind, babelPluginSyntaxGenerators];

      Object.defineProperty(_recorder_._src_client_fileindex_js, "syntaxPlugins", {
        get() {
          return syntaxPlugins;
        },

        set(thisIsVererySecretVariableName) {
          syntaxPlugins = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      const FETCH_TIMEOUT = 5000;

      Object.defineProperty(_recorder_._src_client_fileindex_js, "FETCH_TIMEOUT", {
        get() {
          return FETCH_TIMEOUT;
        },

        set(thisIsVererySecretVariableName) {
          FETCH_TIMEOUT = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      const t = babel.types;

      Object.defineProperty(_recorder_._src_client_fileindex_js, "t", {
        get() {
          return t;
        },

        set(thisIsVererySecretVariableName) {
          t = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      Object.defineProperty(_recorder_._src_client_fileindex_js, "wait", {
        get() {
          return wait;
        },

        set(thisIsVererySecretVariableName) {
          wait = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });


      function getBaseURL(url) {
        return url.replace(/[#?].*/, "");
      }

      class FileIndex {

        static current() {
          // FileIndex._current = null
          if (!this._current) {
            this._current = new FileIndex("file_index");
          }
          return this._current;
        }

        toString() {
          return "[" + this.name + ":FileIndex]";
        }

        clear() {
          this.db.files.clear();
          this.db.modules.clear();
          this.db.links.clear();
          this.db.classes.clear();
          this.db.versions.clear();
          this.db.exports.clear
          // this.db.delete() 
          ();
        }

        constructor(name) {
          this.name = name;
          this.db = this.fileCacheDB();
        }

        fileCacheDB() {
          var db = new Dexie(this.name);

          db.version(1).stores({
            files: 'url,name,type,version,modified,options,title,tags,versions',
            history: '[url+version],url,name,type,version,modified,options,title,tags',
            commits: 'hash,message,date',
            links: '[link+url], link, url, location, status',
            modules: 'url, *dependencies',
            classes: '[name+url], name, url, loc, start, end, superClassName, superClassUrl, [superClassName+superClassUrl], *methods',
            versions: '[class+url+method+commitId+date], [class+method], [class+url+action], [class+url+method], class, url, method, commitId, date, action, user'
          }).upgrade(function () {});

          db.version(2).stores({
            files: 'url,name,type,version,modified,options,title,tags,versions',
            history: '[url+version],url,name,type,version,modified,options,title,tags',
            commits: 'hash,message,date',
            links: '[link+url], link, url, location, status',
            modules: 'url, *dependencies',
            classes: '[name+url], name, url, loc, start, end, superClassName, superClassUrl, [superClassName+superClassUrl], *methods',
            versions: '[class+url+method+commitId+date], [class+method], [class+url+action], [class+url+method], class, url, method, commitId, date, action, user',
            exports: 'url,*functions,*classes'
          }).upgrade(function () {});
          db.version(3).stores({
            files: 'url,name,type,version,modified,options,title,tags,versions',
            bibliography: 'key, type, title, author, year, references, organization',
            history: '[url+version],url,name,type,version,modified,options,title,tags',
            commits: 'hash,message,date',
            links: '[link+url], link, url, location, status',
            modules: 'url, *dependencies',
            classes: '[name+url], name, url, loc, start, end, superClassName, superClassUrl, [superClassName+superClassUrl], *methods',
            versions: '[class+url+method+commitId+date], [class+method], [class+url+action], [class+url+method], class, url, method, commitId, date, action, user',
            exports: 'url,*functions,*classes'
          }).upgrade(function () {});

          db.version(4).stores({
            files: 'url,name,type,version,modified,options,title,tags,versions,bibkey',
            bibliography: 'key, type, title, author, year, references, organization',
            history: '[url+version],url,name,type,version,modified,options,title,tags',
            commits: 'hash,message,date',
            links: '[link+url], link, url, location, status',
            modules: 'url, *dependencies',
            classes: '[name+url], name, url, loc, start, end, superClassName, superClassUrl, [superClassName+superClassUrl], *methods',
            versions: '[class+url+method+commitId+date], [class+method], [class+url+action], [class+url+method], class, url, method, commitId, date, action, user',
            exports: 'url,*functions,*classes'
          }).upgrade(function () {});

          db.version(5).stores({
            files: 'url,name,type,version,modified,options,title,*tags,*versions,bibkey', // references
            bibref: '[url+key], key, url, type, title, author, year, *references, organization',
            history: '[url+version],url,name,type,version,modified,options,title,*tags',
            commits: 'hash,message,date',
            links: '[link+url], link, url, location, status',
            modules: 'url, *dependencies',
            classes: '[name+url], name, url, loc, start, end, superClassName, superClassUrl, [superClassName+superClassUrl], *methods',
            versions: '[class+url+method+commitId+date], [class+method], [class+url+action], [class+url+method], class, url, method, commitId, date, action, user',
            exports: 'url,*functions,*classes'
          }).upgrade(function () {});

          db.version(6).stores({
            files: "url,name,type,version,modified,options,title,*tags,*versions,bibkey,*references"
          }).upgrade(function () {});

          db.version(7).stores({
            bibref: '[url+key], key, url, type, title, *authors, year, *references, organization'
          }).upgrade(function () {});
          db.version(8).stores({}).upgrade(function () {});
          db.version(9).stores({
            bibliography: null
          }).upgrade(function () {});
          db.version(10).stores({
            bibref: null
          }).upgrade(function () {});
          db.version(11).stores({
            bibliography: '[url+key], key, url, type, title, *authors, year, *references, organization'
          }).upgrade(function () {});
          db.version(12).stores({
            bibliography: '[url+key], key, url, type, title, *authors,*keywords, year, *references, organization'
          }).upgrade(function () {});
          db.version(13).stores({
            files: "url,name,type,version,modified,options,title,*tags,*versions,bibkey,*references, *unboundIdentifiers"
          }).upgrade(function () {});
          return db;
        }

        async toArray() {
          return this.db.files.where("name").notEqual("").toArray();
        }

        async update() {
          await this.updateTitleAndTags();
          await this.updateAllModuleSemantics();
          await this.updateAllLinks();
          await this.updateAllLatestVersionHistories();
        }

        async updateTitleAndTags() {
          return this.showProgress("update title", () => {
            return this.db.files.where("name").notEqual("").modify(ea => {
              this.extractTitleAndTags(ea);
            });
          });
        }

        extractTitleAndTags(file) {
          if (!file.content) return;
          file.title = file.content.split("\n")[0].replace(/## /, "");
          file.tags = Strings.matchAll('(?: )(#[A-Za-z0-9]+)(?=[ \n])(?! ?{)', file.content).map(ea => ea[1]);
        }

        async updateAllBibkeys() {
          var result = [];
          await this.db.transaction('rw', this.db.files, () => {
            this.db.files.where("type").equals("file").each(file => {
              if (file.url.match(/\.pdf$/)) {
                file.bibkey = Bibliography.urlToKey(file.url);
                this.db.files.put(file);
                result.push(file);
              }
            });
          });
          return result;
        }

        addBibrefs(file) {
          if (file.url.match(/\.bib$/) && file.content) {
            console.log('[fileindex] addBibrefs');
            var bib = BibtexParser.toJSON(file.content);
            bib.forEach(entry => {
              var refentry = {
                key: entry.citationKey || "undefined",
                url: file.url,
                source: BibtexParser.toBibtex([entry], false),
                type: entry.entryType,
                references: []
              };

              if (entry.entryTags) {
                refentry.authors = Bibliography.splitAuthors(entry.entryTags.author || entry.entryTags.Author);
                refentry.title = Bibliography.cleanTitle(entry.entryTags.title || entry.entryTags.Title);
                refentry.year = entry.entryTags.year || entry.entryTags.Year;
                refentry.keywords = (entry.entryTags.keywords || entry.entryTags.Keywords || "").split(", ");
                refentry.organization = entry.entryTags.organization || entry.entryTags.Organization;
              }
              this.db.bibliography.put(refentry);
            });
          }
        }

        async updateAllBibrefs() {
          var result = [];
          await this.db.transaction('rw', this.db.files, this.db.bibliography, () => {
            this.db.files.where("type").equals("file").each(file => {
              this.addBibrefs(file);
            });
          });
          return result;
        }

        async updateAllModuleSemantics() {
          await this.db.transaction('rw', this.db.files, this.db.classes, this.db.modules, () => {
            this.db.files.where("type").equals("file").each(file => {
              this.addModuleSemantics(file);
            });
          });
        }

        async addModuleSemantics(file) {
          if (file.name && file.name.match(/\.js$/)) {
            var result = this.extractModuleSemantics(file);
            this.updateModule(file.url, result);
            this.updateClasses(file, result);
            this.updateExportEntry(file.url, result);
            this.updateUnboundIdentifiers(file, result);
          }
        }

        extractModuleSemantics(file) {
          var ast = this.parseSource(file.url, file.content);
          if (!ast) {
            console.info('Could not parse file:', file.url);
            return [];
          }
          var results = this.parseModuleSemantics(ast);
          return results;
        }

        async updateClasses(file, semantics) {
          if (!semantics || !semantics.classes) {
            return;
          }
          var classNames = [];
          for (var eaClass of semantics.classes) {
            if (eaClass.superClassName && !eaClass.superClassUrl) {
              let superClass = semantics.classes.find(item => item.name == eaClass.superClassName);
              eaClass.superClassName = superClass ? superClass.superClassName : '';
              eaClass.superClassUrl = superClass ? file.url : '';
            } else if (eaClass.superClassName && eaClass.superClassUrl) {
              eaClass.superClassUrl = await System.resolve(eaClass.superClassUrl, file.url);
            }
            eaClass.url = file.url;
            eaClass.nom = eaClass.methods ? eaClass.methods.length : 0;
            classNames.push(eaClass.name);
            await this.addClass(eaClass);
          }
          var allClasses = await this.db.classes.where({ url: file.url }).toArray

          // deleted obsolete classes
          ();var obsoleteClasses = allClasses.filter(ea => !classNames.includes(ea.name));
          for (let eaClass of obsoleteClasses) {
            await this.db.classes.where({ name: eaClass.name, url: eaClass.url }).delete();
          }
        }

        async addClass(clazz) {
          await this.db.classes.where({ name: clazz.name, url: clazz.url }).delete();
          this.db.classes.put(clazz);
        }

        async updateExportEntry(url, semantics) {
          if (!semantics || !semantics.functionExports && !semantics.classExports) {
            return;
          }
          if (semantics.functionExports.length > 0 || semantics.classExports.length > 0) {
            let exportEntry = {
              url: url,
              functions: semantics.functionExports,
              classes: semantics.classExports
            };
            await this.addExportEntry(exportEntry);
          }
        }

        async addExportEntry(exportEntry) {
          await this.db.exports.where({ url: exportEntry.url }).delete();
          this.db.exports.put(exportEntry);
        }

        async updateUnboundIdentifiers(file, semantics) {
          if (!semantics || !semantics.unboundIdentifiers) {
            return;
          }
          if (semantics.unboundIdentifiers.length > 0) {
            file.unboundIdentifiers = semantics.unboundIdentifiers.filter((value, index, self) => self.indexOf(value) === index);
            this.db.files.put(file);
          }
        }

        async updateModule(fileUrl, semantics) {
          if (!semantics || !semantics.dependencies) {
            return;
          }

          let resolvedDependencies = await ModuleDependencyAnalysis.resolveModuleDependencies(fileUrl, semantics.dependencies);
          this.db.transaction("rw", this.db.modules, () => {
            this.db.modules.put(resolvedDependencies);
          });
        }

        /* extract links and check status */
        async updateAllLinks() {
          await this.db.transaction('rw', this.db.files, this.db.links, () => {
            this.db.files.where("type").equals("file").each(file => {
              this.addLinks(file);
            });
          });
          console.log('updateAllLinks() finished.');
        }

        async addLinks(file) {
          BrokenLinkAnalysis.extractLinks(file).then(links => {
            this.db.transaction("rw!", this.db.links, async () => {
              this.db.links.where("url").equals(file.url).delete();
              if (links) {
                this.db.links.bulkPut(links);
              }
            });
          });
        }

        /* checks status of links */
        async checkLink(link, statusCache = new Map()) {
          var normalizedLink = Paths.normalizePath(link.link, link.url);
          console.log("[fileindex] checkLink " + link.url + " -> " + normalizedLink);
          var status = statusCache.get(normalizedLink);
          if (!status) {
            status = await this.validateLink(normalizedLink);
            statusCache.set(normalizedLink, status);
          }
          if (status == "broken") {
            console.warn("[fileindex ] broken link " + link.url + " -> " + link.link);
          }
          await this.db.transaction("rw", this.db.links, () => {
            this.db.links.where({ url: link.url, link: link.link }).modify({ status: status });
          });
          return status;
        }

        async checkLinks(links) {
          var statusCache = new Map();
          for (var link of links) {
            await this.checkLink(link, statusCache);
            console.log("[fileindex] updated status " + link.link + " " + link.status);
          }
        }

        async checkLinksFile(url) {
          return this.checkLinks((await this.db.links.where({ url: url }).toArray()));
        }

        async checkAllLinks() {
          return this.checkLinks((await this.db.links.toArray()));
        }

        async extractLinks(file) {
          return BrokenLinkAnalysis.extractLinks(file);
        }

        async validateLink(link) {
          return BrokenLinkAnalysis.validateLink(link);
        }

        async updateAllVersions() {
          await this.db.transaction('rw', this.db.files, this.db.versions, () => {
            return this.db.files.where("type").equals("file").toArray();
          }).then(files => {
            files.forEach(file => {
              if (file.name && file.name.match(/\.js$/)) this.addVersions(file);
            });
          });
        }

        async loadVersions(url) {
          try {
            let response = await await fetch(url, {
              method: "OPTIONS",
              headers: {
                showversions: true,
                "debug-initiator": "fileindex.js#loadVersions"
              }
            });
            let text = await response.text();
            return JSON.parse(text).versions;
          } catch (e) {
            console.error("[fileindex] could not parse versions for " + url, e
            // throw new Error("[fileindex] could not parse versions for " + url, e) 
            );
          }
          return [];
        }

        async addVersions(file) {

          let versions = (await this.loadVersions(file.url)).filter(ea => ea);

          for (let version of versions) {
            var historicFileResult = await this.db.history.where({
              'url': "" + file.url,
              'version': "" + version.version }).toArray();
            if (historicFileResult.length > 0) {
              // console.log("[fileindex] found ", historicFileResult)
            } else {
              // console.log("[fileindex] NEW VERSION " + file.url)

              if (!version.parents) throw new Error("parents missing");
              var parentVersionHash = version.parents.split(" ")[0];

              var historicFile = {
                url: file.url,
                type: file.type,
                name: file.name,
                version: version.version,
                previous: parentVersionHash
                // console.log("[fileindex] add history", historicFile)
              };await this.db.transaction("rw", this.db.history, () => {
                this.db.history.put(historicFile);
              });

              var modifications = await this.findModifiedClassesAndMethods(file.url, version, parentVersionHash
              // console.log("[fileindex] add method modifications ", modifications)
              );this.db.transaction("rw", this.db.versions, () => {
                this.db.versions.bulkPut(modifications);
              }

              // if (i >= 9) break; // consider latest ten versions        
              );
            }
          }
        }

        async loadVersion(url, version) {
          if (!window.FileIndexFileCache) {
            window.FileIndexFileCache = new Map();
          }
          var key = url + "@" + version;
          var cached = window.FileIndexFileCache.get(key);
          if (!cached) {
            cached = await Files.loadFile(url, version);
            window.FileIndexFileCache.set(key, cached);
          }
          return cached;
        }

        findSameMethodInClass(aClass, aMethod) {
          return aClass.methods.find(method => method.name == aMethod.name && method.static == aMethod.static && method.kind == aMethod.kind);
        }

        findSameClassInModule(aModule, aClass) {
          return aModule.classes.find(ea => ea.name == aClass.name);
        }

        createModification(fileUrl, action, version, previousVersionHash, aClass, aMethod, source = "") {
          var result = {
            url: fileUrl,
            class: aClass.name,
            method: "+null+",
            date: version.date,
            user: version.author,
            commitId: version.version,
            previousCommitId: previousVersionHash,
            action: action,
            source: source
          };
          if (aMethod) {
            result.method = aMethod.name;
            result.static = aMethod.static, result.kind = aMethod.kind;
            result.start = aMethod.start;
            result.end = aMethod.end;
          }
          return result;
        }

        async findModifiedClassesAndMethods(fileUrl, latestVersion, previousVersionHash) {
          console.log("findModifiedClassesAndMethods ", fileUrl, latestVersion, previousVersionHash);
          let modifications = new Array();
          let latestContent = await this.loadVersion(fileUrl, latestVersion.version);
          let previousContent = await this.loadVersion(fileUrl, previousVersionHash);
          let astLastest = await this.parseSource(fileUrl, latestContent);
          let astPrevious = await this.parseSource(fileUrl, previousContent);

          if (!astLastest || !astPrevious) {
            return modifications;
          }

          let latest = await this.parseModuleSemantics(astLastest);
          let previous = await this.parseModuleSemantics(astPrevious
          // classes
          );for (let classLatest of latest.classes) {
            try {
              let previousClass = this.findSameClassInModule(previous, classLatest);
              if (!previousClass) {
                // added class
                modifications.push(this.createModification(fileUrl, !previousClass ? "added" : "modified", latestVersion, previousVersionHash, classLatest));
              }
              // methods
              for (let methodLastest of classLatest.methods) {
                var latestSource = latestContent.substring(methodLastest.start, methodLastest.end);
                var modification = this.createModification(fileUrl, "added", latestVersion, previousVersionHash, classLatest, methodLastest, latestSource);

                if (!previousClass) {
                  // added method
                  modifications.push(modification);
                } else {
                  let methodPreviousClass = this.findSameMethodInClass(previousClass, methodLastest);
                  if (methodPreviousClass) {
                    var prevSource = previousContent.substring(methodPreviousClass.start, methodPreviousClass.end);
                    if (prevSource != latestSource) {
                      modification.action = "modified";
                      var diff1 = dmp.diff_main(prevSource, latestSource);
                      modification.patch = dmp.patch_toText(dmp.patch_make(diff1));
                      modification.previousSource = prevSource;
                      modifications.push(modification);
                    } else {
                      // the source was the same in the previous version
                    }
                  } else {
                    // method was not there in previous version
                    modification.action = "added";
                    modifications.push(modification);
                  }
                }
              }

              if (!previousClass) continue;
              for (let methodPreviousClass of previousClass.methods) {
                let latestClassMethod = this.findSameMethodInClass(classLatest, methodPreviousClass);
                if (!latestClassMethod) {
                  // deleted method
                  modifications.push(this.createModification(fileUrl, "deleted", latestVersion, previousVersionHash, classLatest, methodPreviousClass, ""));
                }
              }
            } catch (error) {
              console.error("Version history couldn't created for class: ", classLatest, error);
            }
          }
          return modifications;
        }

        parseModuleSemantics(ast) {
          let classes = [];
          let dependencies = [];
          let importDeclarations = new Map();
          let functionExports = [];
          let classExports = [];
          let unboundIdentifiers = [];
          babel.traverse(ast, {
            ImportDeclaration(path) {
              if (path.node.source && path.node.source.value) {
                let specifierNames = [];
                let moduleUrl = path.node.source.value;
                if (path.node.specifiers) {
                  path.node.specifiers.forEach(function (item) {
                    if (item.type === "ImportNamespaceSpecifier") {
                      specifierNames.push('*');
                      importDeclarations.set('*', moduleUrl);
                    } else {
                      specifierNames.push(item.local.name);
                      importDeclarations.set(item.local.name, moduleUrl);
                    }
                  });
                }
                let dependency = {
                  url: path.node.source.value,
                  names: specifierNames
                };
                dependencies.push(dependency);
              }
            },
            ClassDeclaration(path) {
              let superClassName = '';
              let superClassUrl = '';
              if (path.node.id) {
                let clazz = {
                  name: path.node.id.name,
                  start: path.node.start, // start byte 
                  end: path.node.end, // end byte
                  loc: path.node.loc.end.line - path.node.loc.start.line + 1
                };
                superClassName = path.node.superClass ? path.node.superClass.name : '';
                superClassUrl = importDeclarations.get(superClassName);
                let methods = [];

                if (path.node.body.body) {
                  path.node.body.body.forEach(function (item) {
                    if (item.type === "ClassMethod") {
                      let method = {
                        name: item.key.name,
                        loc: item.loc.end.line - item.loc.start.line + 1,
                        start: item.start,
                        kind: item.kind,
                        static: item.static,
                        end: item.end,
                        leadingComments: item.leadingComments
                      };
                      methods.push(method);
                    }
                  });
                }
                clazz.methods = methods;
                clazz.superClassName = superClassName;
                clazz.superClassUrl = superClassUrl;
                classes.push(clazz);
              }
            },
            ExportNamedDeclaration(path) {
              if (t.isFunctionDeclaration(path.node.declaration)) {
                functionExports.push(path.node.declaration.id.name);
              }
              if (t.isClassDeclaration(path.node.declaration)) {
                classExports.push(path.node.declaration.id.name);
              }
            },
            Identifier(path) {
              if (t.isMemberExpression(path.parent)) {
                if (!t.isThisExpression(path.parent.object)) {
                  unboundIdentifiers.push(path.node.name);
                }
              }
            }
          });
          return { classes, dependencies, functionExports, classExports, unboundIdentifiers };
        }

        // ********************************************************

        showProgress(label, func) {
          ShowDexieProgress.currentLabel = label;
          return cop.withLayers([ShowDexieProgress], () => {
            return func();
          });
        }

        parseSource(filename, source) {
          try {
            return babel.transform(source, {
              babelrc: false,
              plugins: [...syntaxPlugins],
              presets: [],
              filename: filename,
              sourceFileName: filename,
              moduleIds: false,
              sourceMaps: true,
              compact: false,
              comments: true,
              code: true,
              ast: true,
              resolveModuleSource: undefined
            }).ast;
          } catch (e) {
            console.log('FileIndex, could not parse: ' + filename, e);
            return undefined;
          }
        }

        async updateFile(url) {
          url = getBaseURL(url);
          console.log("[fileindex] updateFile " + url);
          var stats = await fetch(url, {
            method: "OPTIONS",
            headers: {
              "debug-initiator": "fileindex.js#updateFile"
            }
          }).then(r => r.clone().json());

          if (!stats.error) {
            await this.addFile(url, stats.name, stats.type, stats.size, stats.modified);
          }
        }

        async addFile(url, name = "", type, size, modified) {
          var start = performance.now();
          if (url.match("/node_modules") || url.match(/\/\./)) {
            // console.log("FileIndex ignore  " + url)
            return;
          }
          console.log("[fileindex] addFile " + url);

          if (type == "file") {
            var json = await this.loadVersions(url);
            if (json) {
              var versions = json.map(ea => ea && ea.version).filter(ea => ea);
            } else {
              console.warn("[lively-index] could not addFile " + url);
            }
          }

          var file = {
            url: url,
            name: name,
            size: size,
            modified: modified,
            versions: versions
          };

          if (name.match(/\.((css)|(js)|(md)|(txt)|(bib)|(x?html))$/)) {
            if (size < 100000) {
              let response = await fetch(url, {
                method: "GET",
                headers: {
                  "debug-initiator": "fileindex.js#addFile"
                }
              });
              file.version = response.clone().headers.get("fileversion");
              file.content = await response.clone().text();
            }
          }

          let fileType = url.replace(/.*\./, "");
          if (type == "directory") {
            type = "directory";
          }
          file.type = type;

          if (file.content) {
            this.extractTitleAndTags(file);
            this.addLinks(file);
            if (file.name.match(/\.md$/)) {
              file.references = Markdown.extractReferences(file.content);
            }
          }

          if (file.name.match(/\.pdf$/)) {
            file.bibkey = Bibliography.urlToKey(file.url);
          }

          file.unboundIdentifiers = [];

          await this.db.transaction("rw", this.db.files, () => {
            this.db.files.put(file);
          });

          if (file.name.match(/\.bib$/)) {
            await this.db.transaction("rw", this.db.bibliography, () => {
              this.addBibrefs(file);
            });
          }

          if (file.name.match(/\.js$/)) {
            await this.addModuleSemantics(file
            // await this.addVersions(file) // #Disabled for now, this is expensive!
            );
          }

          console.log("[fileindex] addFile " + url + " FINISHED (" + Math.round(performance.now() - start) + "ms)");
        }

        async dropFile(url) {
          console.log("FileIndex drop " + url + " from index");
          this.db.transaction("rw", this.db.files, () => {
            this.db.files.delete(url);
          });
        }

        async updateDirectory(baseURL, showProgress, updateDeleted) {
          var json = await fetch(baseURL, {
            method: "OPTIONS",
            headers: {
              filelist: true,
              "debug-initiator": "fileindex.js#updateDirectory"
            }
          }).then(r => {
            if (r.status == 200) {
              return r.json();
            } else {
              console.log("FileIndex fetch failed ", baseURL, r);
            }
          });
          if (!json) {
            console.log("FileIndex could not update " + baseURL);
            return;
          }

          if (showProgress) {
            var progress = await lively.showProgress("add " + baseURL.replace(/\/$/, "").replace(/.*\//, ""));
            var total = json.contents.length;
            var i = 0;
          }

          var lastModified = new Map();
          var visited = new Set();
          var all = new Set();
          await this.db.files.each(file => {
            all.add(file.url);
            lastModified.set(file.url, file.modified // #Workaround #PerformanceBug in #IndexDB 
            );
          });

          try {
            for (let ea of json.contents) {
              if (showProgress) progress.value = i++ / total;

              await wait(1000 // slow down the indexing

              );let eaURL = baseURL.replace(/\/$/, "") + ea.name.replace(/^\./, "");
              let name = eaURL.replace(/.*\//, "");
              if (lastModified.get(eaURL) !== ea.modified) {
                await this.addFile(eaURL, name, ea.type, ea.size, ea.modified);
              }
              visited.add(eaURL);
            }
            all.forEach(eaURL => {
              if (eaURL.startsWith(baseURL) && !visited.has(eaURL)) {
                this.dropFile(eaURL);
              }
            });
          } finally {
            if (showProgress) progress.remove();
          }
          console.log("FileIndex updateDirectory finished");
        }

        async addDirectory(baseURL) {
          this.updateDirectory(baseURL, true // much faster and better
          );
        }
        showAsTable() {
          var result = [];
          this.db.files.each(ea => {
            result.push({
              url: ea.url,
              size: ea.size,
              title: ea.title ? ea.title.replace(/</g, "&lt;").slice(0, 100) : "",
              tags: ea.tags,
              classes: ea.classes,
              functions: ea.functions
            });
          }).then(() => {
            var sorted = _.sortBy(result, ea => Number(ea.size)).reverse();

            lively.openComponentInWindow("lively-table").then(table => {
              table.setFromJSO(sorted);
              table.style.overflow = "auto";
              table.column("size").forEach(cell => cell.classList.add("number"));
            });
          });
        }
      }

      _export("default", FileIndex);

      Object.defineProperty(_recorder_._src_client_fileindex_js, "FileIndex", {
        get() {
          return FileIndex;
        },

        set(thisIsVererySecretVariableName) {
          _export("default", FileIndex = thisIsVererySecretVariableName);

          return true;
        },

        enumerable: true,
        configurable: true
      });
      class BrokenLinkAnalysis {

        static async extractLinks(file) {
          if (!file || !file.content || file.url.includes("/src/external/") || file.url.match(/\.js$/)) {
            return [];
          }

          var links = new Array();
          var statusCache = new Map();
          var extractedLinks = new Array();

          if (file.url.match(/\.md$/)) {
            // #BUG prevents loading in #FireFox due to invalid regexp group
            // FF RegExp version does not support lookbehinds. https://stackoverflow.com/questions/49816707/firefox-invalid-regex-group
            // #TODO Refactor

            // let patternMdFiles = /(?<=(\]:\s*)|(\]\s*\())((http(s)?:\/\/(w{3}[.])?([a-z0-9.-]{1,63}(([:]{1}[0-9]{4,})|([.]{1}){1,}([a-z]{2,})){1,})([a-zA-Z0-9\/\.\-\_#.?=%;]*))|((([./]+|[a-zA-Z\-_]))([a-zA-Z0-9\-_]+\.|[a-zA-Z0-9\-_]+\/)+([a-zA-Z0-9\-_#.?=%;]+)?))/gm
            //      // /(?<=<|\[.*\]:\s*|\[.*\]\)|src\s*=\s*('|")|href\s*=\s*('|"))((((http(s)?:\/\/)(w{3}[.])?)([a-z0-9-]{1,63}(([:]{1}[0-9]{4,})|([.]{1}){1,}([a-z]{2,})){1,}))|([./]+|[a-zA-Z_-]))([a-zA-Z0-9\-_]+\.|[a-zA-Z0-9\-_]+\/)+((\.)?[a-zA-Z0-9\-_#.?=%;]+(\/)?)/gm
            // extractedLinks = file.content.match(patternMdFiles)


          } else if (file.url.match(/\.(css|(x)?html)$/)) {

            // #TODO Refactor

            // let patternHtmlCssFiles = /(?<=(src\s*=\s*|href\s*=\s*|[a-zA-Z0-9\-_]+\s*\{\s*.*\s*:\s*)('|"))((((http(s)?:\/\/)(w{3}[.])?)([a-z0-9-]{1,63}(([:]{1}[0-9]{4,})|([.]{1}){1,}([a-z]{2,})){1,}))|([./]+|[a-zA-Z\-_]))([a-zA-Z0-9\-_]+\.|[a-zA-Z0-9\-_]+\/)+((\.)?[a-zA-Z0-9\-_#.?=%;]+(\/)?)/gm
            // extractedLinks = file.content.match(patternHtmlCssFiles)
          }
          if (!extractedLinks) {
            return [];
          }
          for (const extractedLink of extractedLinks) {
            var normalizedLink = Paths.normalizePath(extractedLink, file.url);
            var status = statusCache.get(normalizedLink);
            if (!status) {
              status = await this.validateLink(normalizedLink);
              statusCache.set(normalizedLink, status);
            }

            let link = {
              link: extractedLink,
              location: extractedLink.includes('lively-kernel.org') ? "internal" : "external",
              url: file.url,
              status: status
            };
            links.push(link);
          }
          return links;
        }

        static async validateLink(url) {
          console.log("[fileindex] validateLink " + url);
          try {
            var response = await BrokenLinkAnalysis.fetch(url, {
              method: "GET", // "GET" or "HEAD" or "OPTIONS" 
              mode: 'no-cors',
              redirect: "follow",
              referrer: "no-referrer" // no-referrer, *client
            }, FETCH_TIMEOUT);

            if (response.type === "basic") {
              // internal link
              if (response.ok) {
                return "alive";
              } else {
                return "broken";
              }
            } else if (response.type === "opaque") {
              // external link
              return "alive";
            }
          } catch (e) {
            return "broken";
          }
          return "alive"; // at least nothing went wrong?
        }

        static async fetch(url, options, timeout) {
          return Promise.race([fetch(url, options), new Promise((_, reject) => setTimeout(() => {
            reject(new Error('Fetch timeout: ' + url));
          }, timeout))]);
        }
      }

      Object.defineProperty(_recorder_._src_client_fileindex_js, "BrokenLinkAnalysis", {
        get() {
          return BrokenLinkAnalysis;
        },

        set(thisIsVererySecretVariableName) {
          BrokenLinkAnalysis = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      class ModuleDependencyAnalysis {

        static async resolveModuleDependencies(fileUrl, dependencies) {
          let resolvedDependencies = new Array();
          for (const dependency of dependencies) {
            let resolvedDependency = await System.resolve(dependency.url, fileUrl);
            if (!resolvedDependency) {
              resolvedDependencies.push(dependency.url);
            } else {
              resolvedDependencies.push(resolvedDependency);
            }
          }

          return {
            url: fileUrl,
            dependencies: resolvedDependencies
          };
        }
      }

      Object.defineProperty(_recorder_._src_client_fileindex_js, "ModuleDependencyAnalysis", {
        get() {
          return ModuleDependencyAnalysis;
        },

        set(thisIsVererySecretVariableName) {
          ModuleDependencyAnalysis = thisIsVererySecretVariableName;
          return true;
        },

        enumerable: true,
        configurable: true
      });
      cop.layer(self, "ShowDexieProgress").refineClass(FileIndex.current().db.Collection, {
        async modify(func) {
          var i = 0;
          var total = await this.count();
          var progress = await lively.showProgress("update");
          if (ShowDexieProgress.currentLabel) {
            progress.textContent = ShowDexieProgress.currentLabel;
          }
          var innerFunc = function (ea) {
            progress.value = i++ / total;
            func(ea);
          };
          // #TODO 'cop.proceed' does not work in the async setting...
          var result = await cop.withoutLayers([ShowDexieProgress], async () => {
            return this.modify(innerFunc);
          });
          progress.remove();
          return result;
        }
      });

      if (self.lively4fetchHandlers) {

        // remove old instances of me
        self.lively4fetchHandlers = self.lively4fetchHandlers.filter(ea => !ea.isFileIndexHandler);
        self.lively4fetchHandlers.unshift({
          isFileIndexHandler: true,
          handle(request, options) {
            // do nothing
          },
          async finsihed(request, options) {
            var url = (request.url || request).toString();
            var method = "GET";
            if (options && options.method) method = options.method;

            var extraSearchRoots = [];
            if (window.lively && lively.preferences) {
              extraSearchRoots = lively.preferences.get("ExtraSearchRoots");
            }

            var serverURL = lively4url.replace(/\/[^/]*$/, "");
            if (url.match(serverURL) || extraSearchRoots.find(ea => url.match(ea))) {
              if (method == "PUT") {
                //  
                // #TODO #PerformanceBug move this to worker and do it async....
                // await FileIndex.current().updateFile(url)
                if (lively.fileIndexWorker) {
                  lively.fileIndexWorker.postMessage({ message: "updateFile", url: url });
                }
              }
              if (method == "DELETE") {
                //
                // await FileIndex.current().dropFile(url)   
                if (lively.fileIndexWorker) {
                  lively.fileIndexWorker.postMessage({ message: "dropFile", url: url });
                }
              }
            }
          }
        });
      }
    }
  };
});