/// <summary>
/// Deserialize to an <see cref="Expression"/> tree.
/// </summary>
/// <param name="json">The json text.</param>
/// <param name="queryRoot">The root of the query to apply.</param>
/// <param name="config">Optional configuration.</param>
/// <returns>The deserialized <see cref="Expression"/> or <c>null</c>.</returns>
/// <exception cref="ArgumentException">Thrown when the json is <c>null</c> or whitespace.</exception>
public static Expression Deserialize(
string json,
Expression queryRoot = null,
Action <IConfigurationBuilder> config = null)
{
Ensure.NotNullOrWhitespace(() => json);
SerializationState state;
if (config != null)
{
var builder = ServiceHost.GetService <IConfigurationBuilder>();
config(builder);
state = builder.Configure();
}
else
{
state = DefaultConfiguration.Value.GetDefaultState();
}
state.QueryRoot = queryRoot;
var root = JsonSerializer.Deserialize <SerializationRoot>(json, state.Options);
state.TypeIndex = new List <string>(
root.TypeIndex ?? new string[0]);
if (root.Expression is JsonElement jsonChild)
{
return(SerializerValue.Deserialize(jsonChild, state));
}
return(null);
}
/// <summary>
/// Deserialize to an <see cref="Expression"/> tree.
/// </summary>
/// <param name="root">The root expression.</param>
/// <param name="queryRoot">The root of the query to apply.</param>
/// <param name="config">Optional configuration.</param>
/// <param name="stateCallback">Register a callback to inspect the state.</param>
/// <returns>The deserialized <see cref="Expression"/> or <c>null</c>.</returns>
/// <exception cref="ArgumentException">Thrown when the json is <c>null</c> or whitespace.</exception>
public static Expression Deserialize(
SerializationRoot root,
Expression queryRoot = null,
Action <IConfigurationBuilder> config = null,
Action <SerializationState> stateCallback = null)
{
SerializationState state;
if (config != null)
{
var builder = ServiceHost.GetService <IConfigurationBuilder>();
config(builder);
state = builder.Configure();
}
else
{
state = DefaultConfiguration.Value.GetDefaultState();
}
state.QueryRoot = queryRoot;
state.TypeIndex = new List <string>(
root.TypeIndex ?? new string[0]);
var result = SerializerValue.Deserialize(root.Expression, state);
stateCallback?.Invoke(state);
return(result);
}
private static Expression Roundtrip(Expression expr, IExpressionSerializer serializer)
{
var slim = serializer.Lift(expr);
var bonsai = serializer.Serialize(slim);
var roundtrippedSlim = serializer.Deserialize(bonsai);
return(serializer.Reduce(roundtrippedSlim));
}
/// <summary> /// Deserializes JSON into a slim representation of an expression. /// </summary> /// <param name="json">The JSON to deserialize.</param> /// <returns>The deserialized slim expression.</returns> private ExpressionSlim DeserializeExpressionSlim(string json) => _expressionSerializer.Deserialize(json);