public static IpnbCellRaw fromCell(@NotNull final IpnbCell cell, int nbformat) {
final IpnbCellRaw raw = new IpnbCellRaw();
if (cell instanceof IpnbEditableCell) {
raw.metadata = ((IpnbEditableCell) cell).getMetadata();
}
if (cell instanceof IpnbMarkdownCell) {
raw.cell_type = "markdown";
raw.source = ((IpnbMarkdownCell) cell).getSource();
} else if (cell instanceof IpnbCodeCell) {
raw.cell_type = "code";
final ArrayList<CellOutputRaw> outputRaws = new ArrayList<CellOutputRaw>();
for (IpnbOutputCell outputCell : ((IpnbCodeCell) cell).getCellOutputs()) {
outputRaws.add(CellOutputRaw.fromOutput(outputCell, nbformat));
}
raw.outputs = outputRaws;
final Integer promptNumber = ((IpnbCodeCell) cell).getPromptNumber();
if (nbformat == 4) {
raw.execution_count = promptNumber != null && promptNumber >= 0 ? promptNumber : null;
raw.source = ((IpnbCodeCell) cell).getSource();
} else {
raw.prompt_number = promptNumber != null && promptNumber >= 0 ? promptNumber : null;
raw.language = ((IpnbCodeCell) cell).getLanguage();
raw.input = ((IpnbCodeCell) cell).getSource();
}
} else if (cell instanceof IpnbRawCell) {
raw.cell_type = "raw";
raw.source = ((IpnbRawCell) cell).getSource();
} else if (cell instanceof IpnbHeadingCell) {
raw.cell_type = "heading";
raw.source = ((IpnbHeadingCell) cell).getSource();
raw.level = ((IpnbHeadingCell) cell).getLevel();
}
return raw;
}
@Nullable
private static ArrayList<String> getStringOrArray(String name, JsonObject object) {
final JsonElement jsonElement = object.get(name);
final ArrayList<String> strings = Lists.newArrayList();
if (jsonElement == null) return null;
if (jsonElement.isJsonArray()) {
final JsonArray array = jsonElement.getAsJsonArray();
for (JsonElement element : array) {
strings.add(element.getAsString());
}
} else {
strings.add(jsonElement.getAsString());
}
return strings;
}