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81 lines
3.2 KiB
81 lines
3.2 KiB
4 days ago
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using System.Globalization;
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using System.Text.RegularExpressions;
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namespace Housing.Services;
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// Adapted from the supplied ScpiMeasurement.cs. Resistance is stored/displayed in kOhm.
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public static class ScpiMeasurement
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{
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public const string ResistanceReadCommand = "MEAS:RES?";
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public const decimal OverloadValue = 999m;
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public const double OverloadThreshold = 9.0e37;
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public static async Task<(decimal Value, bool Overloaded)> ReadResistanceAsync(
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Func<string, Task<string>> queryAsync, string? command = null)
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{
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ArgumentNullException.ThrowIfNull(queryAsync);
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var response = await queryAsync(string.IsNullOrWhiteSpace(command)
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? ResistanceReadCommand : command).ConfigureAwait(false);
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return ParseResponse(response, "RESISTANCE", 0.001m);
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}
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public static (decimal Value, bool Overloaded) ParseResponse(
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string response, string label, decimal scale = 1m)
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{
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if (string.IsNullOrWhiteSpace(response))
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{
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throw new InvalidOperationException($"[{label}] 계측기 응답이 비어있습니다 (응답 수신 실패).");
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}
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var text = response.Trim();
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if (text.Equals("OL", StringComparison.OrdinalIgnoreCase) ||
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text.Equals("O.L", StringComparison.OrdinalIgnoreCase) ||
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text.Equals("OVERLOAD", StringComparison.OrdinalIgnoreCase) ||
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text.Equals("OVLD", StringComparison.OrdinalIgnoreCase))
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{
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return (OverloadValue, true);
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}
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// Require a complete numeric response; an error message containing a number
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// must never be interpreted as a measurement. Only base-unit suffixes are
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// accepted so that, for example, mA cannot silently be treated as A.
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var unitPattern = label.ToUpperInvariant() switch
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{
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"VOLTAGE" => @"(?:V|VOLT|VOLTS)",
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"CURRENT" => @"(?:A|AMP|AMPS|AMPERE|AMPERES)",
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"RESISTANCE" => @"(?:OHM|OHMS|Ω)",
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_ => @"(?!)"
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};
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var match = Regex.Match(text,
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@"^(?<number>[-+]?(?:\d+(?:\.\d*)?|\.\d+)(?:[Ee][-+]?\d+)?)(?:\s*" + unitPattern + @")?$",
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RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
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var numericText = match.Groups["number"].Value;
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if (!match.Success ||
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!double.TryParse(numericText, NumberStyles.Float, CultureInfo.InvariantCulture, out var number) ||
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!double.IsFinite(number))
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{
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throw new InvalidOperationException($"[{label}] 수치 파싱 실패. 원본 응답: [{text}]");
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}
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// Check overload before converting to decimal or applying the Ohm -> kOhm scale.
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if (Math.Abs(number) >= OverloadThreshold)
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{
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return (OverloadValue, true);
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}
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if (!decimal.TryParse(numericText, NumberStyles.Float, CultureInfo.InvariantCulture, out var value))
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{
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throw new InvalidOperationException($"[{label}] 수치 변환 실패. 원본 응답: [{text}]");
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}
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try
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{
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return (checked(value * scale), false);
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}
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catch (OverflowException ex)
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{
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throw new InvalidOperationException($"[{label}] 단위 변환 실패. 원본 응답: [{text}]", ex);
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}
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}
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}
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