Add dfs algorithm

Add dfs algorithm

lib/schemaUtils.js

@@ -87,7 +87,8 @@ const { formatDataPath, checkIsCorrectType, isKnownType,
   ],
 
   crypto = require('crypto'),
-  DEFAULT_SCHEMA_UTILS = require('./30XUtils/schemaUtils30X');
+  DEFAULT_SCHEMA_UTILS = require('./30XUtils/schemaUtils30X'),
+  { getRelatedFiles } = require('./relatedFiles');
   /* eslint-enable */
 
 // See https://github.com/json-schema-faker/json-schema-faker/tree/master/docs#available-options
@@ -4842,6 +4843,35 @@ module.exports = {
         data: adaptedData
       }
     };
+  },
+
+  mapRootFiles(rootFiles) {
+    let data = rootFiles.map((root) => {
+      let relatedFiles = getRelatedFiles();
+      return { rootFile: { path: root.path }, relatedFiles: relatedFiles };
+    });
+
+    return data;
+  },
+
+  processRelatedFiles(inputRelatedFiles) {
+    let version = inputRelatedFiles.specificationVersion ? inputRelatedFiles.specificationVersion : '3.0.0',
+      res = {
+        result: true,
+        output: {
+          type: 'relatedFiles',
+          specification: {
+            type: 'OpenAPI',
+            version: version
+          },
+          data: [
+          ]
+        }
+      };
+    if (inputRelatedFiles.rootFiles && inputRelatedFiles.rootFiles.length > 0) {
+      res.output.data = this.mapRootFiles(inputRelatedFiles.rootFiles, version);
+    }
+    return res;
   }
 
 };