private static Exp AddRead(Exp bin, byte[] bytes, Exp.Type retType)
{
return(new Exp.Module(bin, bytes, (int)retType, MODULE));
}
/// <summary>
/// Create expression that selects list item identified by index and returns
/// selected data specified by returnType.
/// </summary>
/// <example>
/// <code>
/// // a[3] == 5
/// Exp.EQ(
/// ListExp.GetByIndex(ListReturnType.VALUE, Type.INT, Exp.Val(3), Exp.ListBin("a")),
/// Exp.Val(5));
/// </code>
/// </example>
/// <param name="returnType">metadata attributes to return. See <see cref="ListReturnType"/></param>
/// <param name="valueType"> expected type of return value </param>
/// <param name="index"> list index expression </param>
/// <param name="bin">list bin or list value expression</param>
/// <param name="ctx">optional context path for nested CDT</param>
public static Exp GetByIndex(ListReturnType returnType, Exp.Type valueType, Exp index, Exp bin, params CTX[] ctx)
{
byte[] bytes = PackUtil.Pack(ListOperation.GET_BY_INDEX, (int)returnType, index, ctx);
return(AddRead(bin, bytes, valueType));
}
/// <summary>
/// Create expression that selects list item identified by rank and returns selected
/// data specified by returnType.
/// </summary>
/// <example>
/// <code>
/// // Player with lowest score.
/// ListExp.GetByRank(ListReturnType.VALUE, Type.STRING, Exp.Val(0), Exp.ListBin("a"))
/// </code>
/// </example>
/// <param name="returnType">metadata attributes to return. See <see cref="ListReturnType"/></param>
/// <param name="valueType">expected type of return value</param>
/// <param name="rank">rank expression</param>
/// <param name="bin">list bin or list value expression</param>
/// <param name="ctx">optional context path for nested CDT</param>
public static Exp GetByRank(ListReturnType returnType, Exp.Type valueType, Exp rank, Exp bin, params CTX[] ctx)
{
byte[] bytes = PackUtil.Pack(ListOperation.GET_BY_RANK, (int)returnType, rank, ctx);
return(AddRead(bin, bytes, valueType));
}
/// <summary>
/// Create expression that selects map item identified by key and returns selected data
/// specified by returnType.
/// </summary>
/// <example>
/// <code>
/// // Map bin "a" contains key "B"
/// Exp.GT(
/// MapExp.GetByKey(MapReturnType.COUNT, Type.INT, Exp.Val("B"), Exp.MapBin("a")),
/// Exp.Val(0));
/// </code>
/// </example>
/// <param name="returnType">metadata attributes to return. See <see cref="MapReturnType"/> </param>
/// <param name="valueType"> expected type of return value </param>
/// <param name="key"> map key expression </param>
/// <param name="bin"> bin or map value expression </param>
/// <param name="ctx"> optional context path for nested CDT </param>
public static Exp GetByKey(MapReturnType returnType, Exp.Type valueType, Exp key, Exp bin, params CTX[] ctx)
{
byte[] bytes = PackUtil.Pack(MapOperation.GET_BY_KEY, (int)returnType, key, ctx);
return(AddRead(bin, bytes, valueType));
}
