Update gnostic to use yaml.v3 (google#194)

* small steps toward yaml.v3 conversion

* Read and write json schemas with yaml.v3

* rewrite helpers to yaml.v3 (project fails to compile)

* major rework, compiles and passes some tests

* passing most of the core tests

* ugly-passing all unit tests

(requires hand-editing the generated main.go files for extensions, to-fix next)

* cleaner passing of unit tests, all generated files are propertly generated now.

* many type assertions eliminated

* minor renaming

* Update company name.

* regenerate OpenAPIv2.go to remove experimental code (accidentally added)

* fix openapiv3.proto to maintain Info field order, go mod tidy, regen go.sum

* Add new ParseDocument() functions to directly read OpenAPI v2 and v3 docs from bytes.

COMPILE-PROTOS.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright 2016 Google Inc. All Rights Reserved.
+# Copyright 2016 Google LLC. 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.

apps/disco/main.go

@@ -1,4 +1,4 @@
-// Copyright 2019 Google Inc. All Rights Reserved.
+// Copyright 2019 Google LLC. 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.

apps/petstore-builder/builder_test.go

@@ -57,7 +57,7 @@ func testBuilder(version string, t *testing.T) {
 	// Verify that the generated text matches our reference.
 	err = exec.Command("diff", textFile, textReference).Run()
 	if err != nil {
-		t.Logf("Diff failed: %+v", err)
+		t.Logf("Diff %s vs %s failed: %+v", textFile, textReference, err)
 		t.FailNow()
 	}
 

apps/petstore-builder/main.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

apps/petstore-builder/petstore-v2.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

apps/petstore-builder/petstore-v3.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

apps/report-messages/main.go

@@ -1,4 +1,4 @@
-// Copyright 2018 Google Inc. All Rights Reserved.
+// Copyright 2018 Google LLC. 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.

apps/report/main.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

compiler/context.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

compiler/error.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.

compiler/extension-handler.go

@@ -1,4 +1,4 @@
-// Copyright 2017 Google Inc. All Rights Reserved.
+// Copyright 2017 Google LLC. 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.
@@ -16,26 +16,25 @@ package compiler
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"os/exec"
 
 	"strings"
 
-	"errors"
-
 	"github.com/golang/protobuf/proto"
 	"github.com/golang/protobuf/ptypes/any"
 	ext_plugin "github.com/googleapis/gnostic/extensions"
-	yaml "gopkg.in/yaml.v2"
+	yaml "gopkg.in/yaml.v3"
 )
 
 // ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
 type ExtensionHandler struct {
 	Name string
 }
 
-// HandleExtension calls a binary extension handler.
-func HandleExtension(context *Context, in interface{}, extensionName string) (bool, *any.Any, error) {
+// CallExtension calls a binary extension handler.
+func CallExtension(context *Context, in *yaml.Node, extensionName string) (bool, *any.Any, error) {
 	handled := false
 	var errFromPlugin error
 	var outFromPlugin *any.Any
@@ -54,7 +53,7 @@ func HandleExtension(context *Context, in interface{}, extensionName string) (bo
 	return handled, outFromPlugin, errFromPlugin
 }
 
-func (extensionHandlers *ExtensionHandler) handle(in interface{}, extensionName string) (*any.Any, error) {
+func (extensionHandlers *ExtensionHandler) handle(in *yaml.Node, extensionName string) (*any.Any, error) {
 	if extensionHandlers.Name != "" {
 		binary, _ := yaml.Marshal(in)
 
@@ -76,7 +75,6 @@ func (extensionHandlers *ExtensionHandler) handle(in interface{}, extensionName
 		cmd := exec.Command(extensionHandlers.Name)
 		cmd.Stdin = bytes.NewReader(requestBytes)
 		output, err := cmd.Output()
-
 		if err != nil {
 			fmt.Printf("Error: %+v\n", err)
 			return nil, err