An enormous amount of surgery on the low level model.

Every `Build()` method now requires a `context.Context`. This is so the rolodex knows where to resolve from when locating relative links. Without knowing where we are, there is no way to resolve anything. This new mechanism allows the model to recurse across as many files as required to locate references, without loosing track of where we are in the process.

Signed-off-by: quobix <dave@quobix.com>

datamodel/low/v3/callback.go

@@ -4,6 +4,7 @@
 package v3
 
 import (
+	"context"
 	"crypto/sha256"
 	"fmt"
 	"github.com/pb33f/libopenapi/utils"
@@ -39,7 +40,7 @@ func (cb *Callback) FindExpression(exp string) *low.ValueReference[*PathItem] {
 }
 
 // Build will extract extensions, expressions and PathItem objects for Callback
-func (cb *Callback) Build(_, root *yaml.Node, idx *index.SpecIndex) error {
+func (cb *Callback) Build(ctx context.Context, _, root *yaml.Node, idx *index.SpecIndex) error {
 	root = utils.NodeAlias(root)
 	utils.CheckForMergeNodes(root)
 	cb.Reference = new(low.Reference)
@@ -57,7 +58,7 @@ func (cb *Callback) Build(_, root *yaml.Node, idx *index.SpecIndex) error {
 		if strings.HasPrefix(currentCB.Value, "x-") {
 			continue // ignore extension.
 		}
-		callback, eErr, _, rv := low.ExtractObjectRaw[*PathItem](currentCB, callbackNode, idx)
+		callback, eErr, _, rv := low.ExtractObjectRaw[*PathItem](ctx, currentCB, callbackNode, idx)
 		if eErr != nil {
 			return eErr
 		}