op-challenger: Move generic split game logic to separate package.

op-challenger/game/fault/trace/outputs/output_cannon.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/trace"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/trace/split"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
 	"github.com/ethereum/go-ethereum/log"
 )
@@ -21,6 +22,6 @@ func NewOutputCannonTraceAccessor(ctx context.Context, logger log.Logger, rollup
 		return nil, errors.New("not implemented")
 	}
 
-	selector := newSplitProviderSelector(outputProvider, int(topDepth), cannonCreator)
+	selector := split.NewSplitProviderSelector(outputProvider, int(topDepth), cannonCreator)
 	return trace.NewAccessor(selector), nil
 }

op-challenger/game/fault/trace/outputs/split.go → op-challenger/game/fault/trace/split/split.go

-package outputs
+package split
 
 import (
 	"context"
@@ -16,7 +16,7 @@ var (
 
 type ProviderCreator func(ctx context.Context, pre types.Claim, post types.Claim) (types.TraceProvider, error)
 
-func newSplitProviderSelector(topProvider types.TraceProvider, topDepth int, bottomProviderCreator ProviderCreator) trace.ProviderSelector {
+func NewSplitProviderSelector(topProvider types.TraceProvider, topDepth int, bottomProviderCreator ProviderCreator) trace.ProviderSelector {
 	return func(ctx context.Context, game types.Game, ref types.Claim, pos types.Position) (types.TraceProvider, error) {
 		if pos.Depth() <= topDepth {
 			return topProvider, nil

op-challenger/game/fault/trace/outputs/split_test.go → op-challenger/game/fault/trace/split/split_test.go

-package outputs
+package split
 
 import (
 	"context"
@@ -311,7 +311,7 @@ func setupAlphabetSplitSelector(t *testing.T) (*alphabet.AlphabetTraceProvider,
 			AlphabetTraceProvider: alphabet.NewTraceProvider(post.Value.Hex(), bottomDepth),
 		}, nil
 	}
-	selector := newSplitProviderSelector(top, topDepth, bottomCreator)
+	selector := NewSplitProviderSelector(top, topDepth, bottomCreator)
 
 	claimBuilder := test.NewAlphabetClaimBuilder(t, topDepth+bottomDepth)
 	gameBuilder := claimBuilder.GameBuilder(true, true)