Function filterImageFile

private/bufpkg/bufimage/bufimageutil/image_filter.go:153–214

(
	imageFile bufimage.ImageFile,
	imageIndex *imageIndex,
	closure *transitiveClosure,
	options *imageFilterOptions,
)

}

func filterImageFile(
	imageFile bufimage.ImageFile,
	imageIndex *imageIndex,
	closure *transitiveClosure,
	options *imageFilterOptions,
) (bufimage.ImageFile, error) {
	fileDescriptor := imageFile.FileDescriptorProto()
	var sourcePathsRemap sourcePathsRemapTrie
	builder := sourcePathsBuilder{
		imageIndex: imageIndex,
		closure:    closure,
		options:    options,
	}
	newFileDescriptor, changed, err := builder.remapFileDescriptor(&sourcePathsRemap, fileDescriptor)
	if err != nil {
		return nil, err
	}
	if newFileDescriptor == nil {
		return nil, nil // Filtered out.
	}
	if !changed {
		if len(sourcePathsRemap) > 0 {
			return nil, syserror.Newf("unexpected %d sourcePathsRemaps", len(sourcePathsRemap))
		}
		return imageFile, nil // No changes required.
	}

	// Remap the source code info.
	if locations := fileDescriptor.SourceCodeInfo.GetLocation(); len(locations) > 0 {
		newLocations := make([]*descriptorpb.SourceCodeInfo_Location, 0, len(locations))
		for _, location := range locations {
			oldPath := location.Path
			newPath, noComment := sourcePathsRemap.newPath(oldPath)
			if newPath == nil {
				continue
			}
			if noComment || !slices.Equal(oldPath, newPath) {
				location = maybeClone(location, options)
				location.Path = newPath
			}
			if noComment {
				location.LeadingDetachedComments = nil
				location.LeadingComments = nil
				location.TrailingComments = nil
			}
			newLocations = append(newLocations, location)
		}
		newFileDescriptor.SourceCodeInfo = &descriptorpb.SourceCodeInfo{
			Location: newLocations,
		}
	}
	return bufimage.NewImageFile(
		newFileDescriptor,
		imageFile.FullName(),
		imageFile.CommitID(),
		imageFile.ExternalPath(),
		imageFile.LocalPath(),
		imageFile.IsImport(),