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using System;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
using Microsoft.Extensions.Primitives;
using System.Globalization;
using Npgsql;
using NpgsqlTypes;
namespace NpgsqlRest;
internal class ParameterParser
{
internal static bool TryParseParameter(
ref StringValues values,
ref TypeDescriptor descriptor,
ref NpgsqlParameter parameter)
{
static bool TryGetValue(
ref TypeDescriptor descriptor,
ref string? value,
out object? resultValue)
{
if (!descriptor.IsText && string.IsNullOrEmpty(value))
{
resultValue = DBNull.Value;
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Smallint)
{
if (short.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var shortValue))
{
resultValue = shortValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Integer)
{
if (int.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var intValue))
{
resultValue = intValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Bigint)
{
if (long.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var bigValue))
{
resultValue = bigValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Double)
{
if (double.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var doubleValue))
{
resultValue = doubleValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Real)
{
if (float.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var floatValue))
{
resultValue = floatValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Numeric || descriptor.BaseDbType == NpgsqlDbType.Money)
{
if (decimal.TryParse(value, CultureInfo.InvariantCulture.NumberFormat, out var decimalValue))
{
resultValue = decimalValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Boolean)
{
if (bool.TryParse(value, out var boolValue))
{
resultValue = boolValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Timestamp || descriptor.BaseDbType == NpgsqlDbType.TimestampTz)
{
if (DateTime.TryParse(value, out var dateTimeValue))
{
if (descriptor.BaseDbType == NpgsqlDbType.TimestampTz)
{
resultValue = DateTime.SpecifyKind(dateTimeValue, DateTimeKind.Utc);
}
else
{
resultValue = dateTimeValue;
}
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Date)
{
if (DateOnly.TryParse(value, out var dateTimeValue))
{
resultValue = dateTimeValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Time || descriptor.BaseDbType == NpgsqlDbType.TimeTz)
{
if (DateTime.TryParse(value, out var dateTimeValue))
{
if (descriptor.BaseDbType == NpgsqlDbType.TimeTz)
{
resultValue = new DateTimeOffset(DateTime.SpecifyKind(dateTimeValue, DateTimeKind.Utc));
}
else
{
resultValue = TimeOnly.FromDateTime(dateTimeValue);
};
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Uuid)
{
if (Guid.TryParse(value, out var guidValue))
{
resultValue = guidValue;
return true;
}
else
{
resultValue = null!;
return false;
}
}
else if (descriptor.IsText)
{
resultValue = value;
return true;
}
// for all other cases, use raw string
resultValue = value;
return true;
}
if (descriptor.IsArray == false)
{
if (values.Count == 0)
{
parameter.Value = DBNull.Value;
return true;
}
else if (values.Count == 1)
{
var value = values[0];
if (TryGetValue(ref descriptor, ref value, out var resultValue))
{
parameter.Value = resultValue;
return true;
}
return false;
}
else
{
StringBuilder sb = new();
for (var i = 0; i < values.Count; i++)
{
sb.Append(values[i]);
}
var value = sb.ToString();
if (TryGetValue(ref descriptor, ref value, out var resultValue))
{
parameter.Value = resultValue;
return true;
}
return false;
}
}
else
{
if (values.Count == 0)
{
parameter.Value = DBNull.Value;
return true;
}
else
{
var list = new List<object?>(values.Count);
for (var i = 0; i < values.Count; i++)
{
var value = values[i];
if (TryGetValue(ref descriptor, ref value, out var resultValue))
{
list.Add(resultValue);
}
else
{
return false;
}
}
parameter.Value = list;
return true;
}
}
}
internal static bool TryParseParameter(
ref JsonNode? value,
ref TypeDescriptor descriptor,
ref NpgsqlParameter parameter)
{
if (value is null)
{
parameter.Value = DBNull.Value;
return true;
}
JsonValueKind kind = value.GetValueKind();
if (kind == JsonValueKind.Null)
{
parameter.Value = DBNull.Value;
return true;
}
bool TryGetNonStringValue(
ref TypeDescriptor descriptor,
ref JsonNode value,
ref JsonValueKind valueKind,
out object result)
{
try
{
if (valueKind == JsonValueKind.Number)
{
if (descriptor.BaseDbType == NpgsqlDbType.Smallint)
{
result = value.GetValue<short>();
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Integer)
{
result = value.GetValue<int>();
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Bigint)
{
result = value.GetValue<long>();
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Double)
{
result = value.GetValue<double>();
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Real)
{
result = value.GetValue<float>();
return true;
}
else if (descriptor.BaseDbType == NpgsqlDbType.Numeric || descriptor.BaseDbType == NpgsqlDbType.Money)
{
result = value.GetValue<decimal>();
return true;
}
}
if ((valueKind == JsonValueKind.True || valueKind == JsonValueKind.False) && descriptor.BaseDbType == NpgsqlDbType.Boolean)
{
result = value.GetValue<bool>();
return true;
}
}
catch (Exception ex) when (ex is FormatException || ex is InvalidOperationException)
{
}
result = null!;
return false;
}
bool TryGetNonStringValueFromString(
ref TypeDescriptor descriptor,
ref string content,
out object result)
{
if (descriptor.BaseDbType == NpgsqlDbType.Timestamp || descriptor.BaseDbType == NpgsqlDbType.TimestampTz)
{
if (DateTime.TryParse(content, out var dateTimeValue))
{
if (descriptor.BaseDbType == NpgsqlDbType.TimestampTz)
{
result = DateTime.SpecifyKind(dateTimeValue, DateTimeKind.Utc);
}
else
{
result = dateTimeValue;
}
return true;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Date)
{
if (DateOnly.TryParse(content, out var dateTimeValue))
{
result = dateTimeValue;
return true;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Time || descriptor.BaseDbType == NpgsqlDbType.TimeTz)
{
if (DateTime.TryParse(content, out var dateTimeValue))
{
if (descriptor.BaseDbType == NpgsqlDbType.TimeTz)
{
result = new DateTimeOffset(DateTime.SpecifyKind(dateTimeValue, DateTimeKind.Utc));
}
else
{
result = TimeOnly.FromDateTime(dateTimeValue);
};
return true;
}
}
else if (descriptor.BaseDbType == NpgsqlDbType.Uuid)
{
if (Guid.TryParse(content, out var guidValue))
{
result = guidValue;
return true;
}
}
result = null!;
return false;
}
if (TryGetNonStringValue(ref descriptor, ref value, ref kind, out var nonStringValue))
{
parameter.Value = nonStringValue;
return true;
}
if (kind == JsonValueKind.Array)
{
var list = new List<object?>();
JsonArray array = value.AsArray();
for (var i = 0; i < array.Count; i++)
{
var arrayItem = array[i];
if (arrayItem is null)
{
list.Add(null);
continue;
}
var arrayItemKind = arrayItem.GetValueKind();
if (arrayItemKind == JsonValueKind.Null)
{
list.Add(null);
continue;
}
if (TryGetNonStringValue(ref descriptor, ref arrayItem, ref arrayItemKind, out object arrayValue))
{
list.Add(arrayValue);
continue;
}
var arrayItemContent = arrayItem.ToString();
if (TryGetNonStringValueFromString(ref descriptor, ref arrayItemContent, out arrayValue))
{
list.Add(arrayValue);
continue;
}
list.Add(arrayItemContent);
}
parameter.Value = list;
return true;
}
var content = value.ToString();
if (TryGetNonStringValueFromString(ref descriptor, ref content, out nonStringValue))
{
parameter.Value = nonStringValue;
return true;
}
parameter.Value = content;
return true;
}
}
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