v2 and v3 response model now in place.

Closing in around the branch soon, all the leaves and twigs are just about in place.

what-changed/model/response.go

@@ -2,3 +2,156 @@
 // SPDX-License-Identifier: MIT
 
 package model
+
+import (
+	"github.com/pb33f/libopenapi/datamodel/low"
+	"github.com/pb33f/libopenapi/datamodel/low/v2"
+	"github.com/pb33f/libopenapi/datamodel/low/v3"
+	"reflect"
+)
+
+type ResponseChanges struct {
+	PropertyChanges
+	ExtensionChanges *ExtensionChanges
+	HeadersChanges   map[string]*HeaderChanges
+
+	// v2
+	SchemaChanges   *SchemaChanges
+	ExamplesChanges *ExamplesChanges
+
+	// v3
+	ContentChanges map[string]*MediaTypeChanges
+	LinkChanges    map[string]*LinkChanges
+	ServerChanges  *ServerChanges
+}
+
+func (r *ResponseChanges) TotalChanges() int {
+	c := r.PropertyChanges.TotalChanges()
+	if r.ExtensionChanges != nil {
+		c += r.ExtensionChanges.TotalChanges()
+	}
+	if r.SchemaChanges != nil {
+		c += r.SchemaChanges.TotalChanges()
+	}
+	if r.ExamplesChanges != nil {
+		c += r.ExamplesChanges.TotalChanges()
+	}
+	for k := range r.HeadersChanges {
+		c += r.HeadersChanges[k].TotalChanges()
+	}
+	for k := range r.ContentChanges {
+		c += r.ContentChanges[k].TotalChanges()
+	}
+	for k := range r.LinkChanges {
+		c += r.LinkChanges[k].TotalChanges()
+	}
+	return c
+}
+
+func (r *ResponseChanges) TotalBreakingChanges() int {
+	c := r.PropertyChanges.TotalBreakingChanges()
+	if r.SchemaChanges != nil {
+		c += r.SchemaChanges.TotalBreakingChanges()
+	}
+	for k := range r.HeadersChanges {
+		c += r.HeadersChanges[k].TotalBreakingChanges()
+	}
+	for k := range r.ContentChanges {
+		c += r.ContentChanges[k].TotalBreakingChanges()
+	}
+	for k := range r.LinkChanges {
+		c += r.LinkChanges[k].TotalBreakingChanges()
+	}
+	return c
+}
+
+func CompareResponse(l, r any) *ResponseChanges {
+
+	var changes []*Change
+	var props []*PropertyCheck
+
+	rc := new(ResponseChanges)
+
+	if reflect.TypeOf(&v2.Response{}) == reflect.TypeOf(l) && reflect.TypeOf(&v2.Response{}) == reflect.TypeOf(r) {
+
+		lResponse := l.(*v2.Response)
+		rResponse := r.(*v2.Response)
+
+		// perform hash check to avoid further processing
+		if low.AreEqual(lResponse, rResponse) {
+			return nil
+		}
+
+		// description
+		addPropertyCheck(&props, lResponse.Description.ValueNode, rResponse.Description.ValueNode,
+			lResponse.Description.Value, lResponse.Description.Value, &changes, v3.DescriptionLabel, false)
+
+		if !lResponse.Schema.IsEmpty() && !rResponse.Schema.IsEmpty() {
+			rc.SchemaChanges = CompareSchemas(lResponse.Schema.Value, rResponse.Schema.Value)
+		}
+		if !lResponse.Schema.IsEmpty() && rResponse.Schema.IsEmpty() {
+			CreateChange(&changes, ObjectRemoved, v3.SchemaLabel,
+				lResponse.Schema.ValueNode, nil, true,
+				lResponse.Schema.Value, nil)
+		}
+		if lResponse.Schema.IsEmpty() && !rResponse.Schema.IsEmpty() {
+			CreateChange(&changes, ObjectAdded, v3.SchemaLabel,
+				nil, rResponse.Schema.ValueNode, true,
+				nil, lResponse.Schema.Value)
+		}
+
+		rc.HeadersChanges =
+			CheckMapForChanges(lResponse.Headers.Value, rResponse.Headers.Value,
+				&changes, v3.HeadersLabel, CompareHeadersV2)
+
+		if !lResponse.Examples.IsEmpty() && !rResponse.Examples.IsEmpty() {
+			rc.ExamplesChanges = CompareExamplesV2(lResponse.Examples.Value, rResponse.Examples.Value)
+		}
+		if !lResponse.Examples.IsEmpty() && rResponse.Examples.IsEmpty() {
+			CreateChange(&changes, PropertyRemoved, v3.ExamplesLabel,
+				lResponse.Schema.ValueNode, nil, false,
+				lResponse.Schema.Value, nil)
+		}
+		if lResponse.Examples.IsEmpty() && !rResponse.Examples.IsEmpty() {
+			CreateChange(&changes, ObjectAdded, v3.ExamplesLabel,
+				nil, rResponse.Schema.ValueNode, false,
+				nil, lResponse.Schema.Value)
+		}
+
+		rc.ExtensionChanges = CompareExtensions(lResponse.Extensions, rResponse.Extensions)
+	}
+
+	if reflect.TypeOf(&v3.Response{}) == reflect.TypeOf(l) && reflect.TypeOf(&v3.Response{}) == reflect.TypeOf(r) {
+
+		lResponse := l.(*v3.Response)
+		rResponse := r.(*v3.Response)
+
+		// perform hash check to avoid further processing
+		if low.AreEqual(lResponse, rResponse) {
+			return nil
+		}
+
+		// description
+		addPropertyCheck(&props, lResponse.Description.ValueNode, rResponse.Description.ValueNode,
+			lResponse.Description.Value, lResponse.Description.Value, &changes, v3.DescriptionLabel, false)
+
+		rc.HeadersChanges =
+			CheckMapForChanges(lResponse.Headers.Value, rResponse.Headers.Value,
+				&changes, v3.HeadersLabel, CompareHeadersV3)
+
+		rc.ContentChanges =
+			CheckMapForChanges(lResponse.Content.Value, rResponse.Content.Value,
+				&changes, v3.ContentLabel, CompareMediaTypes)
+
+		rc.LinkChanges =
+			CheckMapForChanges(lResponse.Links.Value, rResponse.Links.Value,
+				&changes, v3.LinksLabel, CompareLinks)
+
+		rc.ExtensionChanges = CompareExtensions(lResponse.Extensions, rResponse.Extensions)
+	}
+
+	CheckProperties(props)
+	rc.Changes = changes
+	return rc
+
+}