Add vendor folder to git

vendor/github.com/googleapis/gnostic/generator/INSTALL.sh

@@ -0,0 +1,18 @@
+go get github.com/golang/protobuf/protoc-gen-go
+
+pushd $GOPATH/src/github.com/googleapis/gnostic/generator 
+go build
+cd ..
+./generator/generator
+popd
+
+pushd $GOPATH/src/github.com/googleapis/gnostic/generator
+go install
+popd
+
+pushd $GOPATH/src/github.com/googleapis/gnostic/OpenAPIv2
+protoc \
+--go_out=Mgoogle/protobuf/any.proto=github.com/golang/protobuf/ptypes/any:. OpenAPIv2.proto 
+go build
+go install
+popd

vendor/github.com/googleapis/gnostic/generator/README.md

@@ -0,0 +1,11 @@
+# The gnostic compiler generator
+
+This directory contains code that generates a protocol buffer
+representation and supporting code for a JSON schema.
+
+It is currently used to build models of OpenAPI specifications
+and extensions which are described as "vendor extensions" in 
+OpenAPI 2.0 and "specification extensions" in OpenAPI 3.0.
+
+For usage information, run the "generator" binary with no
+options.

vendor/github.com/googleapis/gnostic/generator/domain.go

@@ -0,0 +1,620 @@
+// 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 main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"sort"
+	"strings"
+
+	"github.com/googleapis/gnostic/jsonschema"
+)
+
+// models a collection of types that is defined by a schema
+type Domain struct {
+	TypeModels         map[string]*TypeModel   // models of the types in the domain
+	Prefix             string                  // type prefix to use
+	Schema             *jsonschema.Schema      // top-level schema
+	PatternNames       map[string]string       // a configured mapping from patterns to property names
+	ObjectTypeRequests map[string]*TypeRequest // anonymous types implied by type instantiation
+	MapTypeRequests    map[string]string       // "NamedObject" types that will be used to implement ordered maps
+	Version            string                  // OpenAPI Version ("v2" or "v3")
+}
+
+func NewDomain(schema *jsonschema.Schema, version string) *Domain {
+	cc := &Domain{}
+	cc.TypeModels = make(map[string]*TypeModel, 0)
+	cc.PatternNames = make(map[string]string, 0)
+	cc.ObjectTypeRequests = make(map[string]*TypeRequest, 0)
+	cc.MapTypeRequests = make(map[string]string, 0)
+	cc.Schema = schema
+	cc.Version = version
+	return cc
+}
+
+// Returns a capitalized name to use for a generated type
+func (domain *Domain) TypeNameForStub(stub string) string {
+	return domain.Prefix + strings.ToUpper(stub[0:1]) + stub[1:len(stub)]
+}
+
+// Returns a capitalized name to use for a generated type based on a JSON reference
+func (domain *Domain) typeNameForReference(reference string) string {
+	parts := strings.Split(reference, "/")
+	first := parts[0]
+	last := parts[len(parts)-1]
+	if first == "#" {
+		return domain.TypeNameForStub(last)
+	} else {
+		return "Schema"
+	}
+}
+
+// Returns a property name to use for a JSON reference
+func (domain *Domain) propertyNameForReference(reference string) *string {
+	parts := strings.Split(reference, "/")
+	first := parts[0]
+	last := parts[len(parts)-1]
+	if first == "#" {
+		return &last
+	} else {
+		return nil
+	}
+	return nil
+}
+
+// Determines the item type for arrays defined by a schema
+func (domain *Domain) arrayItemTypeForSchema(propertyName string, schema *jsonschema.Schema) string {
+	// default
+	itemTypeName := "Any"
+
+	if schema.Items != nil {
+
+		if schema.Items.SchemaArray != nil {
+
+			if len(*(schema.Items.SchemaArray)) > 0 {
+				ref := (*schema.Items.SchemaArray)[0].Ref
+				if ref != nil {
+					itemTypeName = domain.typeNameForReference(*ref)
+				} else {
+					types := (*schema.Items.SchemaArray)[0].Type
+					if types == nil {
+						// do nothing
+					} else if (types.StringArray != nil) && len(*(types.StringArray)) == 1 {
+						itemTypeName = (*types.StringArray)[0]
+					} else if (types.StringArray != nil) && len(*(types.StringArray)) > 1 {
+						itemTypeName = fmt.Sprintf("%+v", types.StringArray)
+					} else if types.String != nil {
+						itemTypeName = *(types.String)
+					} else {
+						itemTypeName = "UNKNOWN"
+					}
+				}
+			}
+
+		} else if schema.Items.Schema != nil {
+			types := schema.Items.Schema.Type
+
+			if schema.Items.Schema.Ref != nil {
+				itemTypeName = domain.typeNameForReference(*schema.Items.Schema.Ref)
+			} else if schema.Items.Schema.OneOf != nil {
+				// this type is implied by the "oneOf"
+				itemTypeName = domain.TypeNameForStub(propertyName + "Item")
+				domain.ObjectTypeRequests[itemTypeName] =
+					NewTypeRequest(itemTypeName, propertyName, schema.Items.Schema)
+			} else if types == nil {
+				// do nothing
+			} else if (types.StringArray != nil) && len(*(types.StringArray)) == 1 {
+				itemTypeName = (*types.StringArray)[0]
+			} else if (types.StringArray != nil) && len(*(types.StringArray)) > 1 {
+				itemTypeName = fmt.Sprintf("%+v", types.StringArray)
+			} else if types.String != nil {
+				itemTypeName = *(types.String)
+			} else {
+				itemTypeName = "UNKNOWN"
+			}
+		}
+
+	}
+	return itemTypeName
+}
+
+func (domain *Domain) buildTypeProperties(typeModel *TypeModel, schema *jsonschema.Schema) {
+	if schema.Properties != nil {
+		for _, pair := range *(schema.Properties) {
+			propertyName := pair.Name
+			propertySchema := pair.Value
+			if propertySchema.Ref != nil {
+				// the property schema is a reference, so we will add a property with the type of the referenced schema
+				propertyTypeName := domain.typeNameForReference(*(propertySchema.Ref))
+				typeProperty := NewTypeProperty()
+				typeProperty.Name = propertyName
+				typeProperty.Type = propertyTypeName
+				typeModel.addProperty(typeProperty)
+			} else if propertySchema.Type != nil {
+				// the property schema specifies a type, so add a property with the specified type
+				if propertySchema.TypeIs("string") {
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, "string")
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					if propertySchema.Enumeration != nil {
+						allowedValues := make([]string, 0)
+						for _, enumValue := range *propertySchema.Enumeration {
+							if enumValue.String != nil {
+								allowedValues = append(allowedValues, *enumValue.String)
+							}
+						}
+						typeProperty.StringEnumValues = allowedValues
+					}
+					typeModel.addProperty(typeProperty)
+				} else if propertySchema.TypeIs("boolean") {
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, "bool")
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					typeModel.addProperty(typeProperty)
+				} else if propertySchema.TypeIs("number") {
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, "float")
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					typeModel.addProperty(typeProperty)
+				} else if propertySchema.TypeIs("integer") {
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, "int")
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					typeModel.addProperty(typeProperty)
+				} else if propertySchema.TypeIs("object") {
+					// the property has an "anonymous" object schema, so define a new type for it and request its creation
+					anonymousObjectTypeName := domain.TypeNameForStub(propertyName)
+					domain.ObjectTypeRequests[anonymousObjectTypeName] =
+						NewTypeRequest(anonymousObjectTypeName, propertyName, propertySchema)
+					// add a property with the type of the requested type
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, anonymousObjectTypeName)
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					typeModel.addProperty(typeProperty)
+				} else if propertySchema.TypeIs("array") {
+					// the property has an array type, so define it as a repeated property of the specified type
+					propertyTypeName := domain.arrayItemTypeForSchema(propertyName, propertySchema)
+					typeProperty := NewTypePropertyWithNameAndType(propertyName, propertyTypeName)
+					typeProperty.Repeated = true
+					if propertySchema.Description != nil {
+						typeProperty.Description = *propertySchema.Description
+					}
+					if typeProperty.Type == "string" {
+						itemSchema := propertySchema.Items.Schema
+						if itemSchema != nil {
+							if itemSchema.Enumeration != nil {
+								allowedValues := make([]string, 0)
+								for _, enumValue := range *itemSchema.Enumeration {
+									if enumValue.String != nil {
+										allowedValues = append(allowedValues, *enumValue.String)
+									}
+								}
+								typeProperty.StringEnumValues = allowedValues
+							}
+						}
+					}
+					typeModel.addProperty(typeProperty)
+				} else {
+					log.Printf("ignoring %+v, which has an unsupported property type '%s'", propertyName, propertySchema.Type.Description())
+				}
+			} else if propertySchema.IsEmpty() {
+				// an empty schema can contain anything, so add an accessor for a generic object
+				typeName := "Any"
+				typeProperty := NewTypePropertyWithNameAndType(propertyName, typeName)
+				typeModel.addProperty(typeProperty)
+			} else if propertySchema.OneOf != nil {
+				anonymousObjectTypeName := domain.TypeNameForStub(propertyName + "Item")
+				domain.ObjectTypeRequests[anonymousObjectTypeName] =
+					NewTypeRequest(anonymousObjectTypeName, propertyName, propertySchema)
+				typeProperty := NewTypePropertyWithNameAndType(propertyName, anonymousObjectTypeName)
+				typeModel.addProperty(typeProperty)
+			} else if propertySchema.AnyOf != nil {
+				anonymousObjectTypeName := domain.TypeNameForStub(propertyName + "Item")
+				domain.ObjectTypeRequests[anonymousObjectTypeName] =
+					NewTypeRequest(anonymousObjectTypeName, propertyName, propertySchema)
+				typeProperty := NewTypePropertyWithNameAndType(propertyName, anonymousObjectTypeName)
+				typeModel.addProperty(typeProperty)
+			} else {
+				log.Printf("ignoring %s.%s, which has an unrecognized schema:\n%+v", typeModel.Name, propertyName, propertySchema.String())
+			}
+		}
+	}
+}
+
+func (domain *Domain) buildTypeRequirements(typeModel *TypeModel, schema *jsonschema.Schema) {
+	if schema.Required != nil {
+		typeModel.Required = (*schema.Required)
+	}
+}
+
+func (domain *Domain) buildPatternPropertyAccessors(typeModel *TypeModel, schema *jsonschema.Schema) {
+	if schema.PatternProperties != nil {
+		typeModel.OpenPatterns = make([]string, 0)
+		for _, pair := range *(schema.PatternProperties) {
+			propertyPattern := pair.Name
+			propertySchema := pair.Value
+			typeModel.OpenPatterns = append(typeModel.OpenPatterns, propertyPattern)
+			typeName := "Any"
+			propertyName := domain.PatternNames[propertyPattern]
+			if propertySchema.Ref != nil {
+				typeName = domain.typeNameForReference(*propertySchema.Ref)
+			}
+			propertyTypeName := fmt.Sprintf("Named%s", typeName)
+			property := NewTypePropertyWithNameTypeAndPattern(propertyName, propertyTypeName, propertyPattern)
+			property.Implicit = true
+			property.MapType = typeName
+			property.Repeated = true
+			domain.MapTypeRequests[property.MapType] = property.MapType
+			typeModel.addProperty(property)
+		}
+	}
+}
+
+func (domain *Domain) buildAdditionalPropertyAccessors(typeModel *TypeModel, schema *jsonschema.Schema) {
+	if schema.AdditionalProperties != nil {
+		if schema.AdditionalProperties.Boolean != nil {
+			if *schema.AdditionalProperties.Boolean == true {
+				typeModel.Open = true
+				propertyName := "additionalProperties"
+				typeName := "NamedAny"
+				property := NewTypePropertyWithNameAndType(propertyName, typeName)
+				property.Implicit = true
+				property.MapType = "Any"
+				property.Repeated = true
+				domain.MapTypeRequests[property.MapType] = property.MapType
+				typeModel.addProperty(property)
+				return
+			}
+		} else if schema.AdditionalProperties.Schema != nil {
+			typeModel.Open = true
+			schema := schema.AdditionalProperties.Schema
+			if schema.Ref != nil {
+				propertyName := "additionalProperties"
+				mapType := domain.typeNameForReference(*schema.Ref)
+				typeName := fmt.Sprintf("Named%s", mapType)
+				property := NewTypePropertyWithNameAndType(propertyName, typeName)
+				property.Implicit = true
+				property.MapType = mapType
+				property.Repeated = true
+				domain.MapTypeRequests[property.MapType] = property.MapType
+				typeModel.addProperty(property)
+				return
+			} else if schema.Type != nil {
+				typeName := *schema.Type.String
+				if typeName == "string" {
+					propertyName := "additionalProperties"
+					typeName := "NamedString"
+					property := NewTypePropertyWithNameAndType(propertyName, typeName)
+					property.Implicit = true
+					property.MapType = "string"
+					property.Repeated = true
+					domain.MapTypeRequests[property.MapType] = property.MapType
+					typeModel.addProperty(property)
+					return
+				} else if typeName == "array" {
+					if schema.Items != nil {
+						itemType := *schema.Items.Schema.Type.String
+						if itemType == "string" {
+							propertyName := "additionalProperties"
+							typeName := "NamedStringArray"
+							property := NewTypePropertyWithNameAndType(propertyName, typeName)
+							property.Implicit = true
+							property.MapType = "StringArray"
+							property.Repeated = true
+							domain.MapTypeRequests[property.MapType] = property.MapType
+							typeModel.addProperty(property)
+							return
+						}
+					}
+				}
+			} else if schema.OneOf != nil {
+				propertyTypeName := domain.TypeNameForStub(typeModel.Name + "Item")
+				propertyName := "additionalProperties"
+				typeName := fmt.Sprintf("Named%s", propertyTypeName)
+				property := NewTypePropertyWithNameAndType(propertyName, typeName)
+				property.Implicit = true
+				property.MapType = propertyTypeName
+				property.Repeated = true
+				domain.MapTypeRequests[property.MapType] = property.MapType
+				typeModel.addProperty(property)
+
+				domain.ObjectTypeRequests[propertyTypeName] =
+					NewTypeRequest(propertyTypeName, propertyName, schema)
+			}
+		}
+	}
+}
+
+func (domain *Domain) buildOneOfAccessors(typeModel *TypeModel, schema *jsonschema.Schema) {
+	oneOfs := schema.OneOf
+	if oneOfs == nil {
+		return
+	}
+	typeModel.Open = true
+	typeModel.OneOfWrapper = true
+	for _, oneOf := range *oneOfs {
+		if oneOf.Ref != nil {
+			ref := *oneOf.Ref
+			typeName := domain.typeNameForReference(ref)
+			propertyName := domain.propertyNameForReference(ref)
+
+			if propertyName != nil {
+				typeProperty := NewTypePropertyWithNameAndType(*propertyName, typeName)
+				typeModel.addProperty(typeProperty)
+			}
+		} else if oneOf.Type != nil && oneOf.Type.String != nil {
+			switch *oneOf.Type.String {
+			case "boolean":
+				typeProperty := NewTypePropertyWithNameAndType("boolean", "bool")
+				typeModel.addProperty(typeProperty)
+			case "integer":
+				typeProperty := NewTypePropertyWithNameAndType("integer", "int")
+				typeModel.addProperty(typeProperty)
+			case "number":
+				typeProperty := NewTypePropertyWithNameAndType("number", "float")
+				typeModel.addProperty(typeProperty)
+			case "string":
+				typeProperty := NewTypePropertyWithNameAndType("string", "string")
+				typeModel.addProperty(typeProperty)
+			default:
+				log.Printf("Unsupported oneOf:\n%+v", oneOf.String())
+			}
+		} else {
+			log.Printf("Unsupported oneOf:\n%+v", oneOf.String())
+		}
+
+	}
+}
+
+func schemaIsContainedInArray(s1 *jsonschema.Schema, s2 *jsonschema.Schema) bool {
+	if s2.TypeIs("array") {
+		if s2.Items.Schema != nil {
+			if s1.IsEqual(s2.Items.Schema) {
+				return true
+			} else {
+				return false
+			}
+		} else {
+			return false
+		}
+	} else {
+		return false
+	}
+}
+
+func (domain *Domain) addAnonymousAccessorForSchema(
+	typeModel *TypeModel,
+	schema *jsonschema.Schema,
+	repeated bool) {
+	ref := schema.Ref
+	if ref != nil {
+		typeName := domain.typeNameForReference(*ref)
+		propertyName := domain.propertyNameForReference(*ref)
+		if propertyName != nil {
+			property := NewTypePropertyWithNameAndType(*propertyName, typeName)
+			property.Repeated = true
+			typeModel.addProperty(property)
+			typeModel.IsItemArray = true
+		}
+	} else {
+		typeName := "string"
+		propertyName := "value"
+		property := NewTypePropertyWithNameAndType(propertyName, typeName)
+		property.Repeated = true
+		typeModel.addProperty(property)
+		typeModel.IsStringArray = true
+	}
+}
+
+func (domain *Domain) buildAnyOfAccessors(typeModel *TypeModel, schema *jsonschema.Schema) {
+	anyOfs := schema.AnyOf
+	if anyOfs == nil {
+		return
+	}
+	if len(*anyOfs) == 2 {
+		if schemaIsContainedInArray((*anyOfs)[0], (*anyOfs)[1]) {
+			//log.Printf("ARRAY OF %+v", (*anyOfs)[0].String())
+			schema := (*anyOfs)[0]
+			domain.addAnonymousAccessorForSchema(typeModel, schema, true)
+		} else if schemaIsContainedInArray((*anyOfs)[1], (*anyOfs)[0]) {
+			//log.Printf("ARRAY OF %+v", (*anyOfs)[1].String())
+			schema := (*anyOfs)[1]
+			domain.addAnonymousAccessorForSchema(typeModel, schema, true)
+		} else {
+			for _, anyOf := range *anyOfs {
+				ref := anyOf.Ref
+				if ref != nil {
+					typeName := domain.typeNameForReference(*ref)
+					propertyName := domain.propertyNameForReference(*ref)
+					if propertyName != nil {
+						property := NewTypePropertyWithNameAndType(*propertyName, typeName)
+						typeModel.addProperty(property)
+					}
+				} else {
+					typeName := "bool"
+					propertyName := "boolean"
+					property := NewTypePropertyWithNameAndType(propertyName, typeName)
+					typeModel.addProperty(property)
+				}
+			}
+		}
+	} else {
+		log.Printf("Unhandled anyOfs:\n%s", schema.String())
+	}
+}
+
+func (domain *Domain) buildDefaultAccessors(typeModel *TypeModel, schema *jsonschema.Schema) {
+	typeModel.Open = true
+	propertyName := "additionalProperties"
+	typeName := "NamedAny"
+	property := NewTypePropertyWithNameAndType(propertyName, typeName)
+	property.MapType = "Any"
+	property.Repeated = true
+	domain.MapTypeRequests[property.MapType] = property.MapType
+	typeModel.addProperty(property)
+}
+
+func (domain *Domain) BuildTypeForDefinition(
+	typeName string,
+	propertyName string,
+	schema *jsonschema.Schema) *TypeModel {
+	if (schema.Type == nil) || (*schema.Type.String == "object") {
+		return domain.buildTypeForDefinitionObject(typeName, propertyName, schema)
+	} else {
+		return nil
+	}
+}
+
+func (domain *Domain) buildTypeForDefinitionObject(
+	typeName string,
+	propertyName string,
+	schema *jsonschema.Schema) *TypeModel {
+	typeModel := NewTypeModel()
+	typeModel.Name = typeName
+	if schema.IsEmpty() {
+		domain.buildDefaultAccessors(typeModel, schema)
+	} else {
+		if schema.Description != nil {
+			typeModel.Description = *schema.Description
+		}
+		domain.buildTypeProperties(typeModel, schema)
+		domain.buildTypeRequirements(typeModel, schema)
+		domain.buildPatternPropertyAccessors(typeModel, schema)
+		domain.buildAdditionalPropertyAccessors(typeModel, schema)
+		domain.buildOneOfAccessors(typeModel, schema)
+		domain.buildAnyOfAccessors(typeModel, schema)
+	}
+	return typeModel
+}
+
+func (domain *Domain) Build() (err error) {
+	if (domain.Schema == nil) || (domain.Schema.Definitions == nil) {
+		return errors.New("missing definitions section")
+	}
+	// create a type for the top-level schema
+	typeName := domain.Prefix + "Document"
+	typeModel := NewTypeModel()
+	typeModel.Name = typeName
+	domain.buildTypeProperties(typeModel, domain.Schema)
+	domain.buildTypeRequirements(typeModel, domain.Schema)
+	domain.buildPatternPropertyAccessors(typeModel, domain.Schema)
+	domain.buildAdditionalPropertyAccessors(typeModel, domain.Schema)
+	domain.buildOneOfAccessors(typeModel, domain.Schema)
+	domain.buildAnyOfAccessors(typeModel, domain.Schema)
+	if len(typeModel.Properties) > 0 {
+		domain.TypeModels[typeName] = typeModel
+	}
+
+	// create a type for each object defined in the schema
+	if domain.Schema.Definitions != nil {
+		for _, pair := range *(domain.Schema.Definitions) {
+			definitionName := pair.Name
+			definitionSchema := pair.Value
+			typeName := domain.TypeNameForStub(definitionName)
+			typeModel := domain.BuildTypeForDefinition(typeName, definitionName, definitionSchema)
+			if typeModel != nil {
+				domain.TypeModels[typeName] = typeModel
+			}
+		}
+	}
+	// iterate over anonymous object types to be instantiated and generate a type for each
+	for typeName, typeRequest := range domain.ObjectTypeRequests {
+		domain.TypeModels[typeRequest.Name] =
+			domain.buildTypeForDefinitionObject(typeName, typeRequest.PropertyName, typeRequest.Schema)
+	}
+
+	// iterate over map item types to be instantiated and generate a type for each
+	mapTypeNames := make([]string, 0)
+	for mapTypeName, _ := range domain.MapTypeRequests {
+		mapTypeNames = append(mapTypeNames, mapTypeName)
+	}
+	sort.Strings(mapTypeNames)
+
+	for _, mapTypeName := range mapTypeNames {
+		typeName := "Named" + strings.Title(mapTypeName)
+		typeModel := NewTypeModel()
+		typeModel.Name = typeName
+		typeModel.Description = fmt.Sprintf(
+			"Automatically-generated message used to represent maps of %s as ordered (name,value) pairs.",
+			mapTypeName)
+		typeModel.IsPair = true
+		typeModel.PairValueType = mapTypeName
+
+		nameProperty := NewTypeProperty()
+		nameProperty.Name = "name"
+		nameProperty.Type = "string"
+		nameProperty.Description = "Map key"
+		typeModel.addProperty(nameProperty)
+
+		valueProperty := NewTypeProperty()
+		valueProperty.Name = "value"
+		valueProperty.Type = mapTypeName
+		valueProperty.Description = "Mapped value"
+		typeModel.addProperty(valueProperty)
+
+		domain.TypeModels[typeName] = typeModel
+	}
+
+	// add a type for string arrays
+	stringArrayType := NewTypeModel()
+	stringArrayType.Name = "StringArray"
+	stringProperty := NewTypeProperty()
+	stringProperty.Name = "value"
+	stringProperty.Type = "string"
+	stringProperty.Repeated = true
+	stringArrayType.addProperty(stringProperty)
+	domain.TypeModels[stringArrayType.Name] = stringArrayType
+
+	// add a type for "Any"
+	anyType := NewTypeModel()
+	anyType.Name = "Any"
+	anyType.Open = true
+	anyType.IsBlob = true
+	valueProperty := NewTypeProperty()
+	valueProperty.Name = "value"
+	valueProperty.Type = "google.protobuf.Any"
+	anyType.addProperty(valueProperty)
+	yamlProperty := NewTypeProperty()
+	yamlProperty.Name = "yaml"
+	yamlProperty.Type = "string"
+	anyType.addProperty(yamlProperty)
+	domain.TypeModels[anyType.Name] = anyType
+	return err
+}
+
+func (domain *Domain) sortedTypeNames() []string {
+	typeNames := make([]string, 0)
+	for typeName, _ := range domain.TypeModels {
+		typeNames = append(typeNames, typeName)
+	}
+	sort.Strings(typeNames)
+	return typeNames
+}
+
+func (domain *Domain) Description() string {
+	typeNames := domain.sortedTypeNames()
+	result := ""
+	for _, typeName := range typeNames {
+		result += domain.TypeModels[typeName].description()
+	}
+	return result
+}

vendor/github.com/googleapis/gnostic/generator/generate-compiler.go

@@ -0,0 +1,638 @@
+// 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 main
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/googleapis/gnostic/printer"
+)
+
+func (domain *Domain) GenerateCompiler(packageName string, license string, imports []string) string {
+	code := &printer.Code{}
+	code.Print(license)
+	code.Print("// THIS FILE IS AUTOMATICALLY GENERATED.\n")
+
+	// generate package declaration
+	code.Print("package %s\n", packageName)
+
+	code.Print("import (")
+	for _, filename := range imports {
+		code.Print("\"" + filename + "\"")
+	}
+	code.Print(")\n")
+
+	// generate a simple Version() function
+	code.Print("func Version() string {")
+	code.Print("  return \"%s\"", packageName)
+	code.Print("}\n")
+
+	typeNames := domain.sortedTypeNames()
+
+	// generate NewX() constructor functions for each type
+	for _, typeName := range typeNames {
+		domain.generateConstructorForType(code, typeName)
+	}
+
+	// generate ResolveReferences() methods for each type
+	for _, typeName := range typeNames {
+		domain.generateResolveReferencesMethodsForType(code, typeName)
+	}
+
+	return code.String()
+}
+
+func (domain *Domain) generateConstructorForType(code *printer.Code, typeName string) {
+	code.Print("func New%s(in interface{}, context *compiler.Context) (*%s, error) {", typeName, typeName)
+	code.Print("errors := make([]error, 0)")
+
+	typeModel := domain.TypeModels[typeName]
+	parentTypeName := typeName
+
+	if typeModel.IsStringArray {
+		code.Print("x := &TypeItem{}")
+		code.Print("switch in := in.(type) {")
+		code.Print("case string:")
+		code.Print("  x.Value = make([]string, 0)")
+		code.Print("  x.Value = append(x.Value, in)")
+		code.Print("case []interface{}:")
+		code.Print("  x.Value = make([]string, 0)")
+		code.Print("  for _, v := range in {")
+		code.Print("    value, ok := v.(string)")
+		code.Print("    if ok {")
+		code.Print("      x.Value = append(x.Value, value)")
+		code.Print("    } else {")
+		code.Print("      message := fmt.Sprintf(\"has unexpected value for string array element: %%+v (%%T)\", value, value)")
+		code.Print("      errors = append(errors, compiler.NewError(context, message))")
+		code.Print("    }")
+		code.Print("  }")
+		code.Print("default:")
+		code.Print("  message := fmt.Sprintf(\"has unexpected value for string array: %%+v (%%T)\", in, in)")
+		code.Print("  errors = append(errors, compiler.NewError(context, message))")
+		code.Print("}")
+	} else if typeModel.IsItemArray {
+		if domain.Version == "v2" {
+			code.Print("x := &ItemsItem{}")
+			code.Print("m, ok := compiler.UnpackMap(in)")
+			code.Print("if !ok {")
+			code.Print("  message := fmt.Sprintf(\"has unexpected value for item array: %%+v (%%T)\", in, in)")
+			code.Print("  errors = append(errors, compiler.NewError(context, message))")
+			code.Print("} else {")
+			code.Print("  x.Schema = make([]*Schema, 0)")
+			code.Print("  y, err := NewSchema(m, compiler.NewContext(\"<array>\", context))")
+			code.Print("  if err != nil {")
+			code.Print("    return nil, err")
+			code.Print("  }")
+			code.Print("  x.Schema = append(x.Schema, y)")
+			code.Print("}")
+		} else if domain.Version == "v3" {
+			code.Print("x := &ItemsItem{}")
+			code.Print("m, ok := compiler.UnpackMap(in)")
+			code.Print("if !ok {")
+			code.Print("  message := fmt.Sprintf(\"has unexpected value for item array: %%+v (%%T)\", in, in)")
+			code.Print("  errors = append(errors, compiler.NewError(context, message))")
+			code.Print("} else {")
+			code.Print("  x.SchemaOrReference = make([]*SchemaOrReference, 0)")
+			code.Print("  y, err := NewSchemaOrReference(m, compiler.NewContext(\"<array>\", context))")
+			code.Print("  if err != nil {")
+			code.Print("    return nil, err")
+			code.Print("  }")
+			code.Print("  x.SchemaOrReference = append(x.SchemaOrReference, y)")
+			code.Print("}")
+		}
+	} else if typeModel.IsBlob {
+		code.Print("x := &Any{}")
+		code.Print("bytes, _ := yaml.Marshal(in)")
+		code.Print("x.Yaml = string(bytes)")
+	} else if typeModel.Name == "StringArray" {
+		code.Print("x := &StringArray{}")
+		code.Print("a, ok := in.([]interface{})")
+		code.Print("if !ok {")
+		code.Print("  message := fmt.Sprintf(\"has unexpected value for StringArray: %%+v (%%T)\", in, in)")
+		code.Print("  errors = append(errors, compiler.NewError(context, message))")
+		code.Print("} else {")
+		code.Print("  x.Value = make([]string, 0)")
+		code.Print("  for _, s := range a {")
+		code.Print("    x.Value = append(x.Value, s.(string))")
+		code.Print("  }")
+		code.Print("}")
+	} else if typeModel.Name == "Primitive" {
+		code.Print("	x := &Primitive{}")
+		code.Print("	matched := false")
+		code.Print("	switch in := in.(type) {")
+		code.Print("	case bool:")
+		code.Print("		x.Oneof = &Primitive_Boolean{Boolean: in}")
+		code.Print("		matched = true")
+		code.Print("	case string:")
+		code.Print("		x.Oneof = &Primitive_String_{String_: in}")
+		code.Print("		matched = true")
+		code.Print("	case int64:")
+		code.Print("		x.Oneof = &Primitive_Integer{Integer: in}")
+		code.Print("		matched = true")
+		code.Print("	case int32:")
+		code.Print("		x.Oneof = &Primitive_Integer{Integer: int64(in)}")
+		code.Print("		matched = true")
+		code.Print("	case int:")
+		code.Print("		x.Oneof = &Primitive_Integer{Integer: int64(in)}")
+		code.Print("		matched = true")
+		code.Print("	case float64:")
+		code.Print("		x.Oneof = &Primitive_Number{Number: in}")
+		code.Print("		matched = true")
+		code.Print("	case float32:")
+		code.Print("		x.Oneof = &Primitive_Number{Number: float64(in)}")
+		code.Print("		matched = true")
+		code.Print("	}")
+		code.Print("	if matched {")
+		code.Print("		// since the oneof matched one of its possibilities, discard any matching errors")
+		code.Print("		errors = make([]error, 0)")
+		code.Print("	}")
+	} else if typeModel.Name == "SpecificationExtension" {
+		code.Print("	x := &SpecificationExtension{}")
+		code.Print("	matched := false")
+		code.Print("	switch in := in.(type) {")
+		code.Print("	case bool:")
+		code.Print("		x.Oneof = &SpecificationExtension_Boolean{Boolean: in}")
+		code.Print("		matched = true")
+		code.Print("	case string:")
+		code.Print("		x.Oneof = &SpecificationExtension_String_{String_: in}")
+		code.Print("		matched = true")
+		code.Print("	case int64:")
+		code.Print("		x.Oneof = &SpecificationExtension_Integer{Integer: in}")
+		code.Print("		matched = true")
+		code.Print("	case int32:")
+		code.Print("		x.Oneof = &SpecificationExtension_Integer{Integer: int64(in)}")
+		code.Print("		matched = true")
+		code.Print("	case int:")
+		code.Print("		x.Oneof = &SpecificationExtension_Integer{Integer: int64(in)}")
+		code.Print("		matched = true")
+		code.Print("	case float64:")
+		code.Print("		x.Oneof = &SpecificationExtension_Number{Number: in}")
+		code.Print("		matched = true")
+		code.Print("	case float32:")
+		code.Print("		x.Oneof = &SpecificationExtension_Number{Number: float64(in)}")
+		code.Print("		matched = true")
+		code.Print("	}")
+		code.Print("	if matched {")
+		code.Print("		// since the oneof matched one of its possibilities, discard any matching errors")
+		code.Print("		errors = make([]error, 0)")
+		code.Print("	}")
+	} else {
+		oneOfWrapper := typeModel.OneOfWrapper
+
+		code.Print("x := &%s{}", typeName)
+
+		if oneOfWrapper {
+			code.Print("matched := false")
+		}
+
+		unpackAtTop := !oneOfWrapper || len(typeModel.Required) > 0
+		if unpackAtTop {
+			code.Print("m, ok := compiler.UnpackMap(in)")
+			code.Print("if !ok {")
+			code.Print("  message := fmt.Sprintf(\"has unexpected value: %%+v (%%T)\", in, in)")
+			code.Print("  errors = append(errors, compiler.NewError(context, message))")
+			code.Print("} else {")
+		}
+		if len(typeModel.Required) > 0 {
+			// verify that map includes all required keys
+			keyString := ""
+			sort.Strings(typeModel.Required)
+			for _, k := range typeModel.Required {
+				if keyString != "" {
+					keyString += ","
+				}
+				keyString += "\""
+				keyString += k
+				keyString += "\""
+			}
+			code.Print("requiredKeys := []string{%s}", keyString)
+			code.Print("missingKeys := compiler.MissingKeysInMap(m, requiredKeys)")
+			code.Print("if len(missingKeys) > 0 {")
+			code.Print("  message := fmt.Sprintf(\"is missing required %%s: %%+v\", compiler.PluralProperties(len(missingKeys)), strings.Join(missingKeys, \", \"))")
+			code.Print("  errors = append(errors, compiler.NewError(context, message))")
+			code.Print("}")
+		}
+
+		if !typeModel.Open {
+			// verify that map has no unspecified keys
+			allowedKeys := make([]string, 0)
+			for _, property := range typeModel.Properties {
+				if !property.Implicit {
+					allowedKeys = append(allowedKeys, property.Name)
+				}
+			}
+			sort.Strings(allowedKeys)
+			allowedKeyString := ""
+			for _, allowedKey := range allowedKeys {
+				if allowedKeyString != "" {
+					allowedKeyString += ","
+				}
+				allowedKeyString += "\""
+				allowedKeyString += allowedKey
+				allowedKeyString += "\""
+			}
+			allowedPatternString := ""
+			if typeModel.OpenPatterns != nil {
+				for _, pattern := range typeModel.OpenPatterns {
+					if allowedPatternString != "" {
+						allowedPatternString += ","
+					}
+					allowedPatternString += "\""
+					allowedPatternString += pattern
+					allowedPatternString += "\""
+				}
+			}
+			// verify that map includes only allowed keys and patterns
+			code.Print("allowedKeys := []string{%s}", allowedKeyString)
+			code.Print("allowedPatterns := []string{%s}", allowedPatternString)
+			code.Print("invalidKeys := compiler.InvalidKeysInMap(m, allowedKeys, allowedPatterns)")
+			code.Print("if len(invalidKeys) > 0 {")
+			code.Print("  message := fmt.Sprintf(\"has invalid %%s: %%+v\", compiler.PluralProperties(len(invalidKeys)), strings.Join(invalidKeys, \", \"))")
+			code.Print("  errors = append(errors, compiler.NewError(context, message))")
+			code.Print("}")
+		}
+
+		var fieldNumber = 0
+		for _, propertyModel := range typeModel.Properties {
+			propertyName := propertyModel.Name
+			fieldNumber += 1
+			propertyType := propertyModel.Type
+			if propertyType == "int" {
+				propertyType = "int64"
+			}
+			var displayName = propertyName
+			if displayName == "$ref" {
+				displayName = "_ref"
+			}
+			if displayName == "$schema" {
+				displayName = "_schema"
+			}
+			displayName = camelCaseToSnakeCase(displayName)
+
+			var line = fmt.Sprintf("%s %s = %d;", propertyType, displayName, fieldNumber)
+			if propertyModel.Repeated {
+				line = "repeated " + line
+			}
+			code.Print("// " + line)
+
+			fieldName := strings.Title(propertyName)
+			if propertyName == "$ref" {
+				fieldName = "XRef"
+			}
+
+			typeModel, typeFound := domain.TypeModels[propertyType]
+			if typeFound && !typeModel.IsPair {
+				if propertyModel.Repeated {
+					code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+					code.Print("if (v%d != nil) {", fieldNumber)
+					code.Print("  // repeated %s", typeModel.Name)
+					code.Print("  x.%s = make([]*%s, 0)", fieldName, typeModel.Name)
+					code.Print("  a, ok := v%d.([]interface{})", fieldNumber)
+					code.Print("  if ok {")
+					code.Print("    for _, item := range a {")
+					code.Print("      y, err := New%s(item, compiler.NewContext(\"%s\", context))", typeModel.Name, propertyName)
+					code.Print("      if err != nil {")
+					code.Print("        errors = append(errors, err)")
+					code.Print("      }")
+					code.Print("      x.%s = append(x.%s, y)", fieldName, fieldName)
+					code.Print("    }")
+					code.Print("  }")
+					code.Print("}")
+				} else {
+					if oneOfWrapper {
+						code.Print("{")
+						if !unpackAtTop {
+							code.Print("  m, ok := compiler.UnpackMap(in)")
+							code.Print("  if ok {")
+						}
+						code.Print("    // errors might be ok here, they mean we just don't have the right subtype")
+						code.Print("    t, matching_error := New%s(m, compiler.NewContext(\"%s\", context))", typeModel.Name, propertyName)
+						code.Print("    if matching_error == nil {")
+						code.Print("      x.Oneof = &%s_%s{%s: t}", parentTypeName, typeModel.Name, typeModel.Name)
+						code.Print("      matched = true")
+						code.Print("    } else {")
+						code.Print("      errors = append(errors, matching_error)")
+						code.Print("    }")
+						if !unpackAtTop {
+							code.Print("  }")
+						}
+						code.Print("}")
+					} else {
+						code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+						code.Print("if (v%d != nil) {", fieldNumber)
+						code.Print("  var err error")
+						code.Print("  x.%s, err = New%s(v%d, compiler.NewContext(\"%s\", context))",
+							fieldName, typeModel.Name, fieldNumber, propertyName)
+						code.Print("  if err != nil {")
+						code.Print("    errors = append(errors, err)")
+						code.Print("  }")
+						code.Print("}")
+					}
+				}
+			} else if propertyType == "string" {
+				if propertyModel.Repeated {
+					code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+					code.Print("if (v%d != nil) {", fieldNumber)
+					code.Print("  v, ok := v%d.([]interface{})", fieldNumber)
+					code.Print("  if ok {")
+					code.Print("    x.%s = compiler.ConvertInterfaceArrayToStringArray(v)", fieldName)
+					code.Print("  } else {")
+					code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+					code.Print("    errors = append(errors, compiler.NewError(context, message))")
+					code.Print("}")
+
+					if propertyModel.StringEnumValues != nil {
+						code.Print("// check for valid enum values")
+						code.Print("// %+v", propertyModel.StringEnumValues)
+
+						stringArrayLiteral := "[]string{"
+						for i, item := range propertyModel.StringEnumValues {
+							if i > 0 {
+								stringArrayLiteral += ","
+							}
+							stringArrayLiteral += "\"" + item + "\""
+						}
+						stringArrayLiteral += "}"
+						code.Print("if ok && !compiler.StringArrayContainsValues(%s, x.%s) {", stringArrayLiteral, fieldName)
+						code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v\", v%d)", propertyName, fieldNumber)
+						code.Print("  errors = append(errors, compiler.NewError(context, message))")
+						code.Print("}")
+					}
+
+					code.Print("}")
+				} else {
+					code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+					code.Print("if (v%d != nil) {", fieldNumber)
+					code.Print("  x.%s, ok = v%d.(string)", fieldName, fieldNumber)
+					code.Print("  if !ok {")
+					code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+					code.Print("    errors = append(errors, compiler.NewError(context, message))")
+					code.Print("  }")
+
+					if propertyModel.StringEnumValues != nil {
+						code.Print("// check for valid enum values")
+						code.Print("// %+v", propertyModel.StringEnumValues)
+
+						stringArrayLiteral := "[]string{"
+						for i, item := range propertyModel.StringEnumValues {
+							if i > 0 {
+								stringArrayLiteral += ","
+							}
+							stringArrayLiteral += "\"" + item + "\""
+						}
+						stringArrayLiteral += "}"
+
+						code.Print("if ok && !compiler.StringArrayContainsValue(%s, x.%s) {", stringArrayLiteral, fieldName)
+						code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+						code.Print("  errors = append(errors, compiler.NewError(context, message))")
+						code.Print("}")
+					}
+					code.Print("}")
+				}
+			} else if propertyType == "float" {
+				code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+				code.Print("if (v%d != nil) {", fieldNumber)
+				code.Print("  switch v%d := v%d.(type) {", fieldNumber, fieldNumber)
+				code.Print("  case float64:")
+				code.Print("    x.%s = v%d", fieldName, fieldNumber)
+				code.Print("  case float32:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  case uint64:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  case uint32:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  case int64:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  case int32:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  case int:")
+				code.Print("    x.%s = float64(v%d)", fieldName, fieldNumber)
+				code.Print("  default:")
+				code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+				code.Print("    errors = append(errors, compiler.NewError(context, message))")
+				code.Print("  }")
+				code.Print("}")
+			} else if propertyType == "int64" {
+				code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+				code.Print("if (v%d != nil) {", fieldNumber)
+				code.Print("  t, ok := v%d.(int)", fieldNumber)
+				code.Print("  if ok {")
+				code.Print("    x.%s = int64(t)", fieldName)
+				code.Print("  } else {")
+				code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+				code.Print("    errors = append(errors, compiler.NewError(context, message))")
+				code.Print("  }")
+				code.Print("}")
+			} else if propertyType == "bool" {
+				if oneOfWrapper {
+					propertyName := "Boolean"
+					code.Print("boolValue, ok := in.(bool)")
+					code.Print("if ok {")
+					code.Print("  x.Oneof = &%s_%s{%s: boolValue}", parentTypeName, propertyName, propertyName)
+					code.Print("}")
+				} else {
+					code.Print("v%d := compiler.MapValueForKey(m, \"%s\")", fieldNumber, propertyName)
+					code.Print("if (v%d != nil) {", fieldNumber)
+					code.Print("  x.%s, ok = v%d.(bool)", fieldName, fieldNumber)
+					code.Print("  if !ok {")
+					code.Print("    message := fmt.Sprintf(\"has unexpected value for %s: %%+v (%%T)\", v%d, v%d)", propertyName, fieldNumber, fieldNumber)
+					code.Print("    errors = append(errors, compiler.NewError(context, message))")
+					code.Print("  }")
+					code.Print("}")
+				}
+			} else {
+				mapTypeName := propertyModel.MapType
+				if mapTypeName != "" {
+					code.Print("// MAP: %s %s", mapTypeName, propertyModel.Pattern)
+					if mapTypeName == "string" {
+						code.Print("x.%s = make([]*NamedString, 0)", fieldName)
+					} else {
+						code.Print("x.%s = make([]*Named%s, 0)", fieldName, mapTypeName)
+					}
+					code.Print("for _, item := range m {")
+					code.Print("k, ok := item.Key.(string)")
+					code.Print("if ok {")
+					code.Print("v := item.Value")
+					if propertyModel.Pattern != "" {
+						code.Print("if compiler.PatternMatches(\"%s\", k) {", propertyModel.Pattern)
+					}
+
+					code.Print("pair := &Named" + strings.Title(mapTypeName) + "{}")
+					code.Print("pair.Name = k")
+
+					if mapTypeName == "string" {
+						code.Print("pair.Value = v.(string)")
+					} else if mapTypeName == "Any" {
+						code.Print("result := &Any{}")
+						code.Print("handled, resultFromExt, err := compiler.HandleExtension(context, v, k)")
+						code.Print("if handled {")
+						code.Print("	if err != nil {")
+						code.Print("		errors = append(errors, err)")
+						code.Print("	} else {")
+						code.Print("		bytes, _ := yaml.Marshal(v)")
+						code.Print("		result.Yaml = string(bytes)")
+						code.Print("		result.Value = resultFromExt")
+						code.Print("		pair.Value = result")
+						code.Print("	}")
+						code.Print("} else {")
+						code.Print("	pair.Value, err = NewAny(v, compiler.NewContext(k, context))")
+						code.Print("	if err != nil {")
+						code.Print("		errors = append(errors, err)")
+						code.Print("	}")
+						code.Print("}")
+
+					} else {
+						code.Print("var err error")
+						code.Print("pair.Value, err = New%s(v, compiler.NewContext(k, context))", mapTypeName)
+						code.Print("if err != nil {")
+						code.Print("  errors = append(errors, err)")
+						code.Print("}")
+					}
+					code.Print("x.%s = append(x.%s, pair)", fieldName, fieldName)
+					if propertyModel.Pattern != "" {
+						code.Print("}")
+					}
+					code.Print("}")
+					code.Print("}")
+				} else {
+					code.Print("// TODO: %s", propertyType)
+				}
+			}
+		}
+		if unpackAtTop {
+			code.Print("}")
+		}
+		if oneOfWrapper {
+			code.Print("if matched {")
+			code.Print("    // since the oneof matched one of its possibilities, discard any matching errors")
+			code.Print("	errors = make([]error, 0)")
+			code.Print("}")
+		}
+	}
+
+	// assumes that the return value is in a variable named "x"
+	code.Print("  return x, compiler.NewErrorGroupOrNil(errors)")
+	code.Print("}\n")
+}
+
+// ResolveReferences() methods
+func (domain *Domain) generateResolveReferencesMethodsForType(code *printer.Code, typeName string) {
+	code.Print("func (m *%s) ResolveReferences(root string) (interface{}, error) {", typeName)
+	code.Print("errors := make([]error, 0)")
+
+	typeModel := domain.TypeModels[typeName]
+	if typeModel.OneOfWrapper {
+		// call ResolveReferences on whatever is in the Oneof.
+		for _, propertyModel := range typeModel.Properties {
+			propertyType := propertyModel.Type
+			_, typeFound := domain.TypeModels[propertyType]
+			if typeFound {
+				code.Print("{")
+				code.Print("p, ok := m.Oneof.(*%s_%s)", typeName, propertyType)
+				code.Print("if ok {")
+				if propertyType == "JsonReference" { // Special case for OpenAPI
+					code.Print("info, err := p.%s.ResolveReferences(root)", propertyType)
+					code.Print("if err != nil {")
+					code.Print("  return nil, err")
+					code.Print("} else if info != nil {")
+					code.Print("  n, err := New%s(info, nil)", typeName)
+					code.Print("  if err != nil {")
+					code.Print("    return nil, err")
+					code.Print("  } else if n != nil {")
+					code.Print("    *m = *n")
+					code.Print("    return nil, nil")
+					code.Print("  }")
+					code.Print("}")
+				} else {
+					code.Print("_, err := p.%s.ResolveReferences(root)", propertyType)
+					code.Print("if err != nil {")
+					code.Print("	return nil, err")
+					code.Print("}")
+				}
+				code.Print("}")
+				code.Print("}")
+			}
+		}
+	} else {
+		for _, propertyModel := range typeModel.Properties {
+			propertyName := propertyModel.Name
+			var displayName = propertyName
+			if displayName == "$ref" {
+				displayName = "_ref"
+			}
+			if displayName == "$schema" {
+				displayName = "_schema"
+			}
+			displayName = camelCaseToSnakeCase(displayName)
+
+			fieldName := strings.Title(propertyName)
+			if propertyName == "$ref" {
+				fieldName = "XRef"
+				code.Print("if m.XRef != \"\" {")
+				//code.Print("log.Printf(\"%s reference to resolve %%+v\", m.XRef)", typeName)
+				code.Print("info, err := compiler.ReadInfoForRef(root, m.XRef)")
+
+				code.Print("if err != nil {")
+				code.Print("	return nil, err")
+				code.Print("}")
+				//code.Print("log.Printf(\"%%+v\", info)")
+
+				if len(typeModel.Properties) > 1 {
+					code.Print("if info != nil {")
+					code.Print("  replacement, err := New%s(info, nil)", typeName)
+					code.Print("  if err == nil {")
+					code.Print("    *m = *replacement")
+					code.Print("    return m.ResolveReferences(root)")
+					code.Print("  }")
+					code.Print("}")
+				}
+
+				code.Print("return info, nil")
+				code.Print("}")
+			}
+
+			if !propertyModel.Repeated {
+				propertyType := propertyModel.Type
+				typeModel, typeFound := domain.TypeModels[propertyType]
+				if typeFound && !typeModel.IsPair {
+					code.Print("if m.%s != nil {", fieldName)
+					code.Print("    _, err := m.%s.ResolveReferences(root)", fieldName)
+					code.Print("    if err != nil {")
+					code.Print("       errors = append(errors, err)")
+					code.Print("    }")
+					code.Print("}")
+				}
+			} else {
+				propertyType := propertyModel.Type
+				_, typeFound := domain.TypeModels[propertyType]
+				if typeFound {
+					code.Print("for _, item := range m.%s {", fieldName)
+					code.Print("if item != nil {")
+					code.Print("  _, err := item.ResolveReferences(root)")
+					code.Print("  if err != nil {")
+					code.Print("     errors = append(errors, err)")
+					code.Print("  }")
+					code.Print("}")
+					code.Print("}")
+				}
+
+			}
+		}
+	}
+	code.Print("  return nil, compiler.NewErrorGroupOrNil(errors)")
+	code.Print("}\n")
+}

vendor/github.com/googleapis/gnostic/generator/generate-extension.go

@@ -0,0 +1,297 @@
+// 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 main
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"sort"
+	"strings"
+
+	"github.com/googleapis/gnostic/compiler"
+	"github.com/googleapis/gnostic/jsonschema"
+	"github.com/googleapis/gnostic/printer"
+)
+
+var PROTO_OPTIONS_FOR_EXTENSION = []ProtoOption{
+	ProtoOption{
+		Name:  "java_multiple_files",
+		Value: "true",
+		Comment: "// This option lets the proto compiler generate Java code inside the package\n" +
+			"// name (see below) instead of inside an outer class. It creates a simpler\n" +
+			"// developer experience by reducing one-level of name nesting and be\n" +
+			"// consistent with most programming languages that don't support outer classes.",
+	},
+
+	ProtoOption{
+		Name:  "java_outer_classname",
+		Value: "VendorExtensionProto",
+		Comment: "// The Java outer classname should be the filename in UpperCamelCase. This\n" +
+			"// class is only used to hold proto descriptor, so developers don't need to\n" +
+			"// work with it directly.",
+	},
+}
+
+const additionalCompilerCodeWithMain = "" +
+	"func handleExtension(extensionName string, info yaml.MapSlice) (bool, proto.Message, error) {\n" +
+	"      switch extensionName {\n" +
+	"      // All supported extensions\n" +
+	"      %s\n" +
+	"      default:\n" +
+	"        return false, nil, nil\n" +
+	"       }\n" +
+	"}\n" +
+	"\n" +
+	"func main() {\n" +
+	"	openapiextension_v1.ProcessExtension(handleExtension)\n" +
+	"}\n"
+
+const caseString = "\n" +
+	"case \"%s\":\n" +
+	"newObject, err := %s.New%s(info, compiler.NewContext(\"$root\", nil))\n" +
+	"return true, newObject, err"
+
+func GenerateMainFile(packageName string, license string, codeBody string, imports []string) string {
+	code := &printer.Code{}
+	code.Print(license)
+	code.Print("// THIS FILE IS AUTOMATICALLY GENERATED.\n")
+
+	// generate package declaration
+	code.Print("package %s\n", packageName)
+
+	code.Print("import (")
+	for _, filename := range imports {
+		code.Print("\"" + filename + "\"")
+	}
+	code.Print(")\n")
+
+	code.Print(codeBody)
+	return code.String()
+}
+
+func getBaseFileNameWithoutExt(filePath string) string {
+	tmp := filepath.Base(filePath)
+	return tmp[0 : len(tmp)-len(filepath.Ext(tmp))]
+}
+
+func toProtoPackageName(input string) string {
+	var out = ""
+	nonAlphaNumeric := regexp.MustCompile("[^0-9A-Za-z_]+")
+	input = nonAlphaNumeric.ReplaceAllString(input, "")
+	for index, character := range input {
+		if character >= 'A' && character <= 'Z' {
+			if index > 0 && input[index-1] != '_' {
+				out += "_"
+			}
+			out += string(character - 'A' + 'a')
+		} else {
+			out += string(character)
+		}
+
+	}
+	return out
+}
+
+func GenerateExtension(schemaFile string, outDir string) error {
+
+	outFileBaseName := getBaseFileNameWithoutExt(schemaFile)
+	extensionNameWithoutXDashPrefix := outFileBaseName[len("x-"):]
+	outDir = path.Join(outDir, "openapi_extensions_"+extensionNameWithoutXDashPrefix)
+	protoPackage := toProtoPackageName(extensionNameWithoutXDashPrefix)
+	protoPackageName := strings.ToLower(protoPackage)
+	goPackageName := protoPackageName
+
+	protoOutDirectory := outDir + "/" + "proto"
+	var err error
+
+	project_root := os.Getenv("GOPATH") + "/src/github.com/googleapis/gnostic/"
+	baseSchema, err := jsonschema.NewSchemaFromFile(project_root + "jsonschema/schema.json")
+	if err != nil {
+		return err
+	}
+	baseSchema.ResolveRefs()
+	baseSchema.ResolveAllOfs()
+
+	openapiSchema, err := jsonschema.NewSchemaFromFile(schemaFile)
+	if err != nil {
+		return err
+	}
+	openapiSchema.ResolveRefs()
+	openapiSchema.ResolveAllOfs()
+
+	// build a simplified model of the types described by the schema
+	cc := NewDomain(openapiSchema, "v2") // TODO fix for OpenAPI v3
+
+	// create a type for each object defined in the schema
+	extensionToMessage := make(map[string]string)
+	schemaErrors := make([]error, 0)
+	if cc.Schema.Definitions != nil {
+		for _, pair := range *(cc.Schema.Definitions) {
+			definitionName := pair.Name
+			definitionSchema := pair.Value
+			// ensure the id field is set
+			if definitionSchema.Id == nil || len(*(definitionSchema.Id)) == 0 {
+				schemaErrors = append(schemaErrors,
+					errors.New(
+						fmt.Sprintf("Schema %s has no 'id' field, which must match the name of the OpenAPI extension that the schema represents.\n", definitionName)))
+			} else {
+				if _, ok := extensionToMessage[*(definitionSchema.Id)]; ok {
+					schemaErrors = append(schemaErrors,
+						errors.New(
+							fmt.Sprintf("Schema %s and %s have the same 'id' field value.\n",
+								definitionName, extensionToMessage[*(definitionSchema.Id)])))
+				}
+				extensionToMessage[*(definitionSchema.Id)] = definitionName
+			}
+			typeName := cc.TypeNameForStub(definitionName)
+			typeModel := cc.BuildTypeForDefinition(typeName, definitionName, definitionSchema)
+			if typeModel != nil {
+				cc.TypeModels[typeName] = typeModel
+			}
+		}
+	}
+	if len(schemaErrors) > 0 {
+		// error has been reported.
+		return compiler.NewErrorGroupOrNil(schemaErrors)
+	}
+
+	err = os.MkdirAll(outDir, os.ModePerm)
+	if err != nil {
+		return err
+	}
+
+	err = os.MkdirAll(protoOutDirectory, os.ModePerm)
+	if err != nil {
+		return err
+	}
+
+	// generate the protocol buffer description
+	PROTO_OPTIONS := append(PROTO_OPTIONS_FOR_EXTENSION,
+		ProtoOption{Name: "java_package", Value: "org.openapi.extension." + strings.ToLower(protoPackage), Comment: "// The Java package name must be proto package name with proper prefix."},
+		ProtoOption{Name: "objc_class_prefix", Value: strings.ToLower(protoPackage),
+			Comment: "// A reasonable prefix for the Objective-C symbols generated from the package.\n" +
+				"// It should at a minimum be 3 characters long, all uppercase, and convention\n" +
+				"// is to use an abbreviation of the package name. Something short, but\n" +
+				"// hopefully unique enough to not conflict with things that may come along in\n" +
+				"// the future. 'GPB' is reserved for the protocol buffer implementation itself.",
+		})
+
+	proto := cc.GenerateProto(protoPackageName, LICENSE, PROTO_OPTIONS, nil)
+	protoFilename := path.Join(protoOutDirectory, outFileBaseName+".proto")
+
+	err = ioutil.WriteFile(protoFilename, []byte(proto), 0644)
+	if err != nil {
+		return err
+	}
+
+	// generate the compiler
+	compiler := cc.GenerateCompiler(goPackageName, LICENSE, []string{
+		"fmt",
+		"strings",
+		"github.com/googleapis/gnostic/compiler",
+	})
+	goFilename := path.Join(protoOutDirectory, outFileBaseName+".go")
+	err = ioutil.WriteFile(goFilename, []byte(compiler), 0644)
+	if err != nil {
+		return err
+	}
+	err = exec.Command(runtime.GOROOT()+"/bin/gofmt", "-w", goFilename).Run()
+
+	// generate the main file.
+	outDirRelativeToGoPathSrc := strings.Replace(outDir, path.Join(os.Getenv("GOPATH"), "src")+"/", "", 1)
+	imports := []string{
+		"gopkg.in/yaml.v2",
+		"github.com/golang/protobuf/proto",
+		"github.com/googleapis/gnostic/extensions",
+		"github.com/googleapis/gnostic/compiler",
+		outDirRelativeToGoPathSrc + "/" + "proto",
+	}
+	var extensionNameKeys []string
+	for k := range extensionToMessage {
+		extensionNameKeys = append(extensionNameKeys, k)
+	}
+	sort.Strings(extensionNameKeys)
+
+	var cases string
+	for _, extensionName := range extensionNameKeys {
+		cases += fmt.Sprintf(caseString, extensionName, goPackageName, extensionToMessage[extensionName])
+	}
+	extMainCode := fmt.Sprintf(additionalCompilerCodeWithMain, cases)
+
+	main := GenerateMainFile("main", LICENSE, extMainCode, imports)
+	mainFileName := path.Join(outDir, "main.go")
+	err = ioutil.WriteFile(mainFileName, []byte(main), 0644)
+	if err != nil {
+		return err
+	}
+
+	// format the compiler
+	return exec.Command(runtime.GOROOT()+"/bin/gofmt", "-w", mainFileName).Run()
+}
+
+func ProcessExtensionGenCommandline(usage string) error {
+
+	outDir := ""
+	schameFile := ""
+
+	extParamRegex, _ := regexp.Compile("--(.+)=(.+)")
+
+	for i, arg := range os.Args {
+		if i == 0 {
+			continue // skip the tool name
+		}
+		var m [][]byte
+		if m = extParamRegex.FindSubmatch([]byte(arg)); m != nil {
+			flagName := string(m[1])
+			flagValue := string(m[2])
+			switch flagName {
+			case "out_dir":
+				outDir = flagValue
+			default:
+				fmt.Printf("Unknown option: %s.\n%s\n", arg, usage)
+				os.Exit(-1)
+			}
+		} else if arg == "--extension" {
+			continue
+		} else if arg[0] == '-' {
+			fmt.Printf("Unknown option: %s.\n%s\n", arg, usage)
+			os.Exit(-1)
+		} else {
+			schameFile = arg
+		}
+	}
+
+	if schameFile == "" {
+		fmt.Printf("No input json schema specified.\n%s\n", usage)
+		os.Exit(-1)
+	}
+	if outDir == "" {
+		fmt.Printf("Missing output directive.\n%s\n", usage)
+		os.Exit(-1)
+	}
+	if !strings.HasPrefix(getBaseFileNameWithoutExt(schameFile), "x-") {
+		fmt.Printf("Schema file name has to start with 'x-'.\n%s\n", usage)
+		os.Exit(-1)
+	}
+
+	return GenerateExtension(schameFile, outDir)
+}

vendor/github.com/googleapis/gnostic/generator/generate-proto.go

@@ -0,0 +1,118 @@
+// 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 main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/googleapis/gnostic/printer"
+)
+
+type ProtoOption struct {
+	Name    string
+	Value   string
+	Comment string
+}
+
+func (domain *Domain) GenerateProto(packageName string, license string, options []ProtoOption, imports []string) string {
+	code := &printer.Code{}
+	code.Print(license)
+	code.Print("// THIS FILE IS AUTOMATICALLY GENERATED.")
+	code.Print()
+
+	code.Print("syntax = \"proto3\";")
+	code.Print()
+	code.Print("package " + packageName + ";")
+	for _, importString := range imports {
+		code.Print()
+		code.Print("import \"" + importString + "\";")
+	}
+	code.Print()
+
+	// generate option declarations
+	for _, option := range options {
+		commentLines := strings.Split(option.Comment, "\n")
+		for _, commentLine := range commentLines {
+			code.Print(commentLine)
+		}
+		line := "option " + option.Name + " = "
+		if option.Value == "true" || option.Value == "false" {
+			line += option.Value
+		} else {
+			line += "\"" + option.Value + "\""
+		}
+		line += ";\n"
+		code.Print(line)
+	}
+
+	// generate message definitions
+	typeNames := domain.sortedTypeNames()
+	for _, typeName := range typeNames {
+		typeModel := domain.TypeModels[typeName]
+		if typeModel.Description != "" {
+			code.Print("// %s", typeModel.Description)
+		}
+		code.Print("message %s {", typeName)
+		code.Indent()
+		if typeModel.OneOfWrapper {
+			code.Print("oneof oneof {")
+			code.Indent()
+		}
+		var fieldNumber = 0
+		for _, propertyModel := range typeModel.Properties {
+			if propertyModel.Description != "" {
+				code.Print("// %s", propertyModel.Description)
+			}
+			propertyName := propertyModel.Name
+			fieldNumber += 1
+			propertyType := propertyModel.Type
+			if propertyType == "int" {
+				propertyType = "int64"
+			}
+			if propertyType == "float" {
+				propertyType = "double"
+			}
+
+			// TODO may be remove this.
+			if propertyType == "blob" {
+				propertyType = "string"
+			}
+
+			var displayName = propertyName
+			if displayName == "$ref" {
+				displayName = "_ref"
+			}
+			if displayName == "$schema" {
+				displayName = "_schema"
+			}
+			displayName = camelCaseToSnakeCase(displayName)
+
+			var line = fmt.Sprintf("%s %s = %d;", propertyType, displayName, fieldNumber)
+			if propertyModel.Repeated {
+				line = "repeated " + line
+			}
+			code.Print(line)
+		}
+		if typeModel.OneOfWrapper {
+			code.Outdent()
+			code.Print("}")
+		}
+		code.Outdent()
+		code.Print("}")
+		code.Print()
+	}
+	return code.String()
+}

vendor/github.com/googleapis/gnostic/generator/helpers.go

@@ -0,0 +1,34 @@
+// 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 main
+
+// Returns a "snake case" form of a camel-cased string.
+func camelCaseToSnakeCase(input string) string {
+	var out = ""
+
+	for index, runeValue := range input {
+		//fmt.Printf("%#U starts at byte position %d\n", runeValue, index)
+		if runeValue >= 'A' && runeValue <= 'Z' {
+			if index > 0 {
+				out += "_"
+			}
+			out += string(runeValue - 'A' + 'a')
+		} else {
+			out += string(runeValue)
+		}
+
+	}
+	return out
+}

vendor/github.com/googleapis/gnostic/generator/main.go

@@ -0,0 +1,235 @@
+// 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.
+
+// generator generates Protocol Buffer models and support code from
+// JSON Schemas. It is used to generate representations of the
+// OpenAPI Specification and vendor and specification extensions
+// that are added by third-party OpenAPI authors.
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"runtime"
+	"strings"
+
+	"github.com/googleapis/gnostic/jsonschema"
+)
+
+const LICENSE = "" +
+	"// Copyright 2017 Google Inc. All Rights Reserved.\n" +
+	"//\n" +
+	"// Licensed under the Apache License, Version 2.0 (the \"License\");\n" +
+	"// you may not use this file except in compliance with the License.\n" +
+	"// You may obtain a copy of the License at\n" +
+	"//\n" +
+	"//    http://www.apache.org/licenses/LICENSE-2.0\n" +
+	"//\n" +
+	"// Unless required by applicable law or agreed to in writing, software\n" +
+	"// distributed under the License is distributed on an \"AS IS\" BASIS,\n" +
+	"// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n" +
+	"// See the License for the specific language governing permissions and\n" +
+	"// limitations under the License.\n"
+
+func proto_options(packageName string) []ProtoOption {
+	return []ProtoOption{
+		ProtoOption{
+			Name:  "java_multiple_files",
+			Value: "true",
+			Comment: "// This option lets the proto compiler generate Java code inside the package\n" +
+				"// name (see below) instead of inside an outer class. It creates a simpler\n" +
+				"// developer experience by reducing one-level of name nesting and be\n" +
+				"// consistent with most programming languages that don't support outer classes.",
+		},
+
+		ProtoOption{
+			Name:  "java_outer_classname",
+			Value: "OpenAPIProto",
+			Comment: "// The Java outer classname should be the filename in UpperCamelCase. This\n" +
+				"// class is only used to hold proto descriptor, so developers don't need to\n" +
+				"// work with it directly.",
+		},
+
+		ProtoOption{
+			Name:    "java_package",
+			Value:   "org." + packageName,
+			Comment: "// The Java package name must be proto package name with proper prefix.",
+		},
+
+		ProtoOption{
+			Name:  "objc_class_prefix",
+			Value: "OAS",
+			Comment: "// A reasonable prefix for the Objective-C symbols generated from the package.\n" +
+				"// It should at a minimum be 3 characters long, all uppercase, and convention\n" +
+				"// is to use an abbreviation of the package name. Something short, but\n" +
+				"// hopefully unique enough to not conflict with things that may come along in\n" +
+				"// the future. 'GPB' is reserved for the protocol buffer implementation itself.",
+		},
+	}
+}
+
+func GenerateOpenAPIModel(version string) error {
+	var input string
+	var filename string
+	var proto_packagename string
+	var extension_name string
+
+	switch version {
+	case "v2":
+		input = "openapi-2.0.json"
+		filename = "OpenAPIv2"
+		proto_packagename = "openapi.v2"
+		extension_name = "vendorExtension"
+	case "v3":
+		input = "openapi-3.0.json"
+		filename = "OpenAPIv3"
+		proto_packagename = "openapi.v3"
+		extension_name = "specificationExtension"
+	default:
+		return errors.New(fmt.Sprintf("Unknown OpenAPI version %s", version))
+	}
+
+	go_packagename := strings.Replace(proto_packagename, ".", "_", -1)
+
+	project_root := os.Getenv("GOPATH") + "/src/github.com/googleapis/gnostic/"
+
+	base_schema, err := jsonschema.NewSchemaFromFile(project_root + "jsonschema/schema.json")
+	if err != nil {
+		return err
+	}
+	base_schema.ResolveRefs()
+	base_schema.ResolveAllOfs()
+
+	openapi_schema, err := jsonschema.NewSchemaFromFile(project_root + filename + "/" + input)
+	if err != nil {
+		return err
+	}
+	openapi_schema.ResolveRefs()
+	openapi_schema.ResolveAllOfs()
+
+	// build a simplified model of the types described by the schema
+	cc := NewDomain(openapi_schema, version)
+	// generators will map these patterns to the associated property names
+	// these pattern names are a bit of a hack until we find a more automated way to obtain them
+	cc.PatternNames = map[string]string{
+		"^x-": extension_name,
+		// v2
+		"^/": "path",
+		"^([0-9]{3})$|^(default)$": "responseCode",
+		// v3
+		"^([0-9]{3})$": "responseCode",
+		"{property}":   "property",
+		"{name}":       "name",
+		"{expression}": "expression",
+		"/{path}":      "path",
+		"{media-type}": "mediaType",
+	}
+	err = cc.Build()
+	if err != nil {
+		return err
+	}
+
+	if true {
+		log.Printf("Type Model:\n%s", cc.Description())
+	}
+
+	// ensure that the target directory exists
+	err = os.MkdirAll(filename, 0755)
+	if err != nil {
+		return err
+	}
+
+	// generate the protocol buffer description
+	proto := cc.GenerateProto(proto_packagename, LICENSE,
+		proto_options(go_packagename), []string{"google/protobuf/any.proto"})
+	proto_filename := project_root + filename + "/" + filename + ".proto"
+	err = ioutil.WriteFile(proto_filename, []byte(proto), 0644)
+	if err != nil {
+		return err
+	}
+
+	// generate the compiler
+	compiler := cc.GenerateCompiler(go_packagename, LICENSE, []string{
+		"fmt",
+		"gopkg.in/yaml.v2",
+		"strings",
+		"github.com/googleapis/gnostic/compiler",
+	})
+	go_filename := project_root + filename + "/" + filename + ".go"
+	err = ioutil.WriteFile(go_filename, []byte(compiler), 0644)
+	if err != nil {
+		return err
+	}
+	// format the compiler
+	return exec.Command(runtime.GOROOT()+"/bin/gofmt", "-w", go_filename).Run()
+}
+
+func usage() string {
+	return fmt.Sprintf(`
+Usage: %s [OPTIONS]
+Options:
+  --v2
+    Generate Protocol Buffer representation and support code for OpenAPI v2.
+    Files are read from and written to appropriate locations in the gnostic project directory.
+  --v3  
+    Generate Protocol Buffer representation and support code for OpenAPI v3
+    Files are read from and written to appropriate locations in the gnostic project directory.
+  --extension EXTENSION_SCHEMA [EXTENSIONOPTIONS] 
+    Generate a gnostic extension that reads a set of OpenAPI extensions.
+    EXTENSION_SCHEMA is the json schema for the OpenAPI extensions to be supported.
+    EXTENSION_OPTIONS
+      --out_dir=PATH: Location for writing extension models and support code.
+`, path.Base(os.Args[0]))
+}
+
+func main() {
+	var openapi_version = ""
+	var generate_extensions = false
+
+	for i, arg := range os.Args {
+		if i == 0 {
+			continue // skip the tool name
+		}
+		if arg == "--v2" {
+			openapi_version = "v2"
+		} else if arg == "--v3" {
+			openapi_version = "v3"
+		} else if arg == "--extension" {
+			generate_extensions = true
+			break
+		} else {
+			fmt.Printf("Unknown option: %s.\n%s\n", arg, usage())
+			os.Exit(-1)
+		}
+	}
+
+	if openapi_version != "" {
+		err := GenerateOpenAPIModel(openapi_version)
+		if err != nil {
+			fmt.Printf("%+v\n", err)
+		}
+	} else if generate_extensions {
+		err := ProcessExtensionGenCommandline(usage())
+		if err != nil {
+			fmt.Printf("%+v\n", err)
+		}
+	} else {
+		fmt.Printf("%s\n", usage())
+	}
+}

vendor/github.com/googleapis/gnostic/generator/types.go

@@ -0,0 +1,117 @@
+// 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 main
+
+import (
+	"fmt"
+
+	"github.com/googleapis/gnostic/jsonschema"
+)
+
+/// Type Modeling
+
+// models types that we encounter during model-building that have no named schema
+type TypeRequest struct {
+	Name         string             // name of type to be created
+	PropertyName string             // name of a property that refers to this type
+	Schema       *jsonschema.Schema // schema for type
+	OneOfWrapper bool               // true if the type wraps "oneOfs"
+}
+
+func NewTypeRequest(name string, propertyName string, schema *jsonschema.Schema) *TypeRequest {
+	return &TypeRequest{Name: name, PropertyName: propertyName, Schema: schema}
+}
+
+// models type properties, eg. fields
+type TypeProperty struct {
+	Name             string   // name of property
+	Type             string   // type for property (scalar or message type)
+	StringEnumValues []string // possible values if this is an enumerated string type
+	MapType          string   // if this property is for a map, the name of the mapped type
+	Repeated         bool     // true if this property is repeated (an array)
+	Pattern          string   // if the property is a pattern property, names must match this pattern.
+	Implicit         bool     // true if this property is implied by a pattern or "additional properties" property
+	Description      string   // if present, the "description" field in the schema
+}
+
+func (typeProperty *TypeProperty) description() string {
+	result := ""
+	if typeProperty.Description != "" {
+		result += fmt.Sprintf("\t// %+s\n", typeProperty.Description)
+	}
+	if typeProperty.Repeated {
+		result += fmt.Sprintf("\t%s %s repeated %s\n", typeProperty.Name, typeProperty.Type, typeProperty.Pattern)
+	} else {
+		result += fmt.Sprintf("\t%s %s %s \n", typeProperty.Name, typeProperty.Type, typeProperty.Pattern)
+	}
+	return result
+}
+
+func NewTypeProperty() *TypeProperty {
+	return &TypeProperty{}
+}
+
+func NewTypePropertyWithNameAndType(name string, typeName string) *TypeProperty {
+	return &TypeProperty{Name: name, Type: typeName}
+}
+
+func NewTypePropertyWithNameTypeAndPattern(name string, typeName string, pattern string) *TypeProperty {
+	return &TypeProperty{Name: name, Type: typeName, Pattern: pattern}
+}
+
+// models types
+type TypeModel struct {
+	Name          string          // type name
+	Properties    []*TypeProperty // slice of properties
+	Required      []string        // required property names
+	OneOfWrapper  bool            // true if this type wraps "oneof" properties
+	Open          bool            // open types can have keys outside the specified set
+	OpenPatterns  []string        // patterns for properties that we allow
+	IsStringArray bool            // ugly override
+	IsItemArray   bool            // ugly override
+	IsBlob        bool            // ugly override
+	IsPair        bool            // type is a name-value pair used to support ordered maps
+	PairValueType string          // type for pair values (valid if IsPair == true)
+	Description   string          // if present, the "description" field in the schema
+}
+
+func (typeModel *TypeModel) addProperty(property *TypeProperty) {
+	if typeModel.Properties == nil {
+		typeModel.Properties = make([]*TypeProperty, 0)
+	}
+	typeModel.Properties = append(typeModel.Properties, property)
+}
+
+func (typeModel *TypeModel) description() string {
+	result := ""
+	if typeModel.Description != "" {
+		result += fmt.Sprintf("// %+s\n", typeModel.Description)
+	}
+	var wrapperinfo string
+	if typeModel.OneOfWrapper {
+		wrapperinfo = " oneof wrapper"
+	}
+	result += fmt.Sprintf("%+s%s\n", typeModel.Name, wrapperinfo)
+	for _, property := range typeModel.Properties {
+		result += property.description()
+	}
+	return result
+}
+
+func NewTypeModel() *TypeModel {
+	typeModel := &TypeModel{}
+	typeModel.Properties = make([]*TypeProperty, 0)
+	return typeModel
+}