Make DefaultResolver public (#59)

Make DefaultResolver public so that `buf lint` can use it to resolve
`MessageConstraints` and `FieldConstraints`.

internal/evaluator/builder.go

@@ -38,6 +38,12 @@ type Builder struct {
 	Load        func(desc protoreflect.MessageDescriptor) MessageEvaluator
 }
 
+type StandardConstraintResolver interface {
+	ResolveMessageConstraints(desc protoreflect.MessageDescriptor) *validate.MessageConstraints
+	ResolveOneofConstraints(desc protoreflect.OneofDescriptor) *validate.OneofConstraints
+	ResolveFieldConstraints(desc protoreflect.FieldDescriptor) *validate.FieldConstraints
+}
+
 // NewBuilder initializes a new Builder.
 func NewBuilder(
 	env *cel.Env,

internal/evaluator/builder_test.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/bufbuild/protovalidate-go/celext"
 	pb "github.com/bufbuild/protovalidate-go/internal/gen/tests/example/v1"
+	"github.com/bufbuild/protovalidate-go/resolver"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/protobuf/proto"
@@ -32,7 +33,7 @@ func TestBuildCache(t *testing.T) {
 	env, err := celext.DefaultEnv(true)
 	require.NoError(t, err, "failed to construct CEL environment")
 	bldr := NewBuilder(
-		env, false, DefaultResolver{},
+		env, false, resolver.DefaultResolver{},
 	)
 	wg := sync.WaitGroup{}
 	for i := 0; i < 100; i++ {

internal/evaluator/resolver.go → resolver/resolver.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package evaluator
+package resolver
 
 import (
 	"strings"
@@ -28,14 +28,11 @@ const (
 	previousExtensionIndex = "51071"
 )
 
-type StandardConstraintResolver interface {
-	ResolveMessageConstraints(desc protoreflect.MessageDescriptor) *validate.MessageConstraints
-	ResolveOneofConstraints(desc protoreflect.OneofDescriptor) *validate.OneofConstraints
-	ResolveFieldConstraints(desc protoreflect.FieldDescriptor) *validate.FieldConstraints
-}
-
+// DefaultResolver resolves protovalidate constraints options from descriptors.
 type DefaultResolver struct{}
 
+// ResolveMessageConstraints returns the MessageConstraints option set for the
+// MessageDescriptor.
 func (r DefaultResolver) ResolveMessageConstraints(desc protoreflect.MessageDescriptor) *validate.MessageConstraints {
 	constraints := resolveExt[protoreflect.MessageDescriptor, *validate.MessageConstraints](desc, validate.E_Message)
 	if constraints == nil {
@@ -44,6 +41,8 @@ func (r DefaultResolver) ResolveMessageConstraints(desc protoreflect.MessageDesc
 	return constraints
 }
 
+// ResolveOneofConstraints returns the OneofConstraints option set for the
+// OneofDescriptor.
 func (r DefaultResolver) ResolveOneofConstraints(desc protoreflect.OneofDescriptor) *validate.OneofConstraints {
 	constraints := resolveExt[protoreflect.OneofDescriptor, *validate.OneofConstraints](desc, validate.E_Oneof)
 	if constraints == nil {
@@ -52,6 +51,8 @@ func (r DefaultResolver) ResolveOneofConstraints(desc protoreflect.OneofDescript
 	return constraints
 }
 
+// ResolveFieldConstraints returns the FieldConstraints option set for the
+// FieldDescriptor.
 func (r DefaultResolver) ResolveFieldConstraints(desc protoreflect.FieldDescriptor) *validate.FieldConstraints {
 	constraints := resolveExt[protoreflect.FieldDescriptor, *validate.FieldConstraints](desc, validate.E_Field)
 	if constraints == nil {

validator.go

@@ -21,6 +21,7 @@ import (
 	"github.com/bufbuild/protovalidate-go/celext"
 	"github.com/bufbuild/protovalidate-go/internal/errors"
 	"github.com/bufbuild/protovalidate-go/internal/evaluator"
+	"github.com/bufbuild/protovalidate-go/resolver"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoreflect"
 )
@@ -58,7 +59,7 @@ type Validator struct {
 // up the CEL execution environment if the configuration is invalid. See the
 // individual ValidatorOption for how they impact the fallibility of New.
 func New(options ...ValidatorOption) (*Validator, error) {
-	cfg := config{resolver: evaluator.DefaultResolver{}}
+	cfg := config{resolver: resolver.DefaultResolver{}}
 	for _, opt := range options {
 		opt(&cfg)
 	}