Add gnostic to Godep

vendor/github.com/googleapis/gnostic/compiler/error.go

@@ -0,0 +1,59 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package compiler
+
+// basic error type
+type Error struct {
+	Context *Context
+	Message string
+}
+
+func NewError(context *Context, message string) *Error {
+	return &Error{Context: context, Message: message}
+}
+
+func (err *Error) Error() string {
+	if err.Context != nil {
+		return "ERROR " + err.Context.Description() + " " + err.Message
+	} else {
+		return "ERROR " + err.Message
+	}
+}
+
+// container for groups of errors
+type ErrorGroup struct {
+	Errors []error
+}
+
+func NewErrorGroupOrNil(errors []error) error {
+	if len(errors) == 0 {
+		return nil
+	} else if len(errors) == 1 {
+		return errors[0]
+	} else {
+		return &ErrorGroup{Errors: errors}
+	}
+}
+
+func (group *ErrorGroup) Error() string {
+	result := ""
+	for i, err := range group.Errors {
+		if i > 0 {
+			result += "\n"
+		}
+		result += err.Error()
+	}
+	return result
+}