Add error messages

Author: kazuhitoyokoi

lib/nodegen.js

@@ -299,6 +299,16 @@ function swagger2node(data, options) {
             }
         });
 
+        if (swagger.swagger !== '2.0') {
+            reject('unsupported version of OpenAPI document');
+            return;
+        }
+
+        if (!swagger.info.title) {
+            reject('No title is specified in OpenAPI document');
+            return;
+        }
+
         var className = swagger.info.title.toLowerCase().replace(/(^|[^a-z0-9]+)[a-z0-9]/g,
             function (str) {
                 return str.replace(/^[^a-z0-9]+/, '').toUpperCase();
@@ -310,7 +320,7 @@ function swagger2node(data, options) {
 
         if (data.module) {
             if (data.prefix) {
-                reject('error: module name and prefix are conflicted.');
+                reject('module name and prefix are conflicted.');
                 return;
             }
         } else {
@@ -603,7 +613,7 @@ function wottd2node(data, options) {
 
         if (data.module) {
             if (data.prefix) {
-                reject('error: module name and prefix are conflicted');
+                reject('module name and prefix are conflicted');
                 return;
             }
         } else {