mlemanczyk/even-perfect-numbers-scanner
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Add inclusive exponent range filters to results parser

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Marek Lemańczyk committed 2025-09-19 13:47:56 +02:00
1 parent cc4a6f6bed
commit 3a64478aab
1 file changed
+145 -69
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EvenPerfectBitScanner.ResultsParser/Program.cs
+145 -69
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@@ -21,76 +21,147 @@ internal static class Program
private const string DefaultHeader = "p,searchedMersenne,detailedCheck,isPerfect";
private static int Main(string[] args)
{
if (args.Length == 0)
{
PrintHelp();
return 1;
}
private static int Main(string[] args)
{
if (args.Length == 0)
{
PrintHelp();
return 1;
}
if (args.Length == 1 && IsHelpOption(args[0]))
{
PrintHelp();
return 0;
}
if (args.Length == 1 && IsHelpOption(args[0]))
{
PrintHelp();
return 0;
}
if (args.Length != 1)
{
Console.Error.WriteLine("Only a single CSV file path is supported.");
PrintHelp();
return 1;
}
string inputPath = args[0];
if (IsHelpOption(inputPath))
{
PrintHelp();
return 0;
}
string inputPath = args[0];
if (!File.Exists(inputPath))
{
Console.Error.WriteLine($"Input file '{inputPath}' was not found.");
return 1;
}
if (!File.Exists(inputPath))
{
Console.Error.WriteLine($"Input file '{inputPath}' was not found.");
return 1;
}
if (!TryParseRangeArguments(args.AsSpan(1), out ulong pMin, out ulong pMax))
{
return 1;
}
try
{
ProcessFile(inputPath);
return 0;
}
catch (Exception exception)
{
Console.Error.WriteLine($"Processing failed: {exception.Message}");
if (pMin > pMax)
{
Console.Error.WriteLine("The --p-min value cannot be greater than --p-max.");
return 1;
}
try
{
ProcessFile(inputPath, pMin, pMax);
return 0;
}
catch (Exception exception)
{
Console.Error.WriteLine($"Processing failed: {exception.Message}");
return 1;
}
}
private static bool IsHelpOption(string value) => HelpOptions.Contains(value);
private static void PrintHelp()
{
Console.WriteLine("EvenPerfectBitScanner.ResultsParser");
Console.WriteLine("Parses CSV results produced by the candidate scanner.");
Console.WriteLine();
Console.WriteLine("Usage:");
Console.WriteLine(" EvenPerfectBitScanner.ResultsParser <results.csv>");
Console.WriteLine();
Console.WriteLine("The program accepts the following help switches:");
Console.WriteLine(" --?, -?, /?, -help, --help, --h, -h, /h, /help");
Console.WriteLine();
Console.WriteLine("Outputs prime results into four files placed next to the source file:");
Console.WriteLine(" raw-primes-<name> - prime entries in the original order");
Console.WriteLine(" sorted-primes-<name> - prime entries sorted by p");
Console.WriteLine(" sorted-primes-passed-<name> - sorted prime entries with isPerfect = true");
Console.WriteLine(" sorted-primes-rejected-<name> - sorted prime entries with isPerfect = false");
private static bool TryParseRangeArguments(ReadOnlySpan<string> arguments, out ulong pMin, out ulong pMax)
{
pMin = 0UL;
pMax = ulong.MaxValue;
if (arguments.Length == 0)
{
return true;
}
if ((arguments.Length & 1) == 1)
{
Console.Error.WriteLine("Each range option must be followed by a numeric value.");
PrintHelp();
return false;
}
for (int i = 0; i < arguments.Length; i += 2)
{
string option = arguments[i];
string value = arguments[i + 1];
try
{
switch (option)
{
case "--p-min":
pMin = ParseRangeValue(option, value);
break;
case "--p-max":
pMax = ParseRangeValue(option, value);
break;
default:
Console.Error.WriteLine($"Unsupported option '{option}'.");
PrintHelp();
return false;
}
}
catch (FormatException exception)
{
Console.Error.WriteLine(exception.Message);
PrintHelp();
return false;
}
}
return true;
}
private static ulong ParseRangeValue(string option, string value)
{
if (!ulong.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out ulong parsed))
{
throw new FormatException($"Value '{value}' for option '{option}' is not a valid non-negative integer.");
}
return parsed;
}
private static void PrintHelp()
{
Console.WriteLine("EvenPerfectBitScanner.ResultsParser");
Console.WriteLine("Parses CSV results produced by the candidate scanner.");
Console.WriteLine();
Console.WriteLine("Usage:");
Console.WriteLine(" EvenPerfectBitScanner.ResultsParser <results.csv> [--p-min <value>] [--p-max <value>]");
Console.WriteLine();
Console.WriteLine("The program accepts the following help switches:");
Console.WriteLine(" --?, -?, /?, -help, --help, --h, -h, /h, /help");
Console.WriteLine();
Console.WriteLine("Optional range arguments allow filtering primes by exponent:");
Console.WriteLine(" --p-min <value> - include entries with p >= value");
Console.WriteLine(" --p-max <value> - include entries with p <= value");
Console.WriteLine();
Console.WriteLine("Outputs prime results into four files placed next to the source file:");
Console.WriteLine(" raw-primes-<name> - prime entries in the original order");
Console.WriteLine(" sorted-primes-<name> - prime entries sorted by p");
Console.WriteLine(" sorted-primes-passed-<name> - sorted prime entries with isPerfect = true");
Console.WriteLine(" sorted-primes-rejected-<name> - sorted prime entries with isPerfect = false");
Console.WriteLine();
Console.WriteLine("Example:");
Console.WriteLine(" EvenPerfectBitScanner.ResultsParser results.csv");
}
Console.WriteLine(" EvenPerfectBitScanner.ResultsParser results.csv --p-min 89 --p-max 107");
}
private static void ProcessFile(string inputPath)
{
using IEnumerator<string> enumerator = File.ReadLines(inputPath).GetEnumerator();
if (!enumerator.MoveNext())
{
Console.WriteLine("Input file did not contain any data. Created empty outputs using the default header.");
private static void ProcessFile(string inputPath, ulong pMin, ulong pMax)
{
using IEnumerator<string> enumerator = File.ReadLines(inputPath).GetEnumerator();
if (!enumerator.MoveNext())
{
Console.WriteLine("Input file did not contain any data. Created empty outputs using the default header.");
string fallbackHeader = DefaultHeader;
string rawFallbackPath = BuildOutputPath(inputPath, "raw-primes-");
WriteCsv(rawFallbackPath, fallbackHeader, Array.Empty<CandidateResult>());
@@ -111,20 +182,25 @@ internal static class Program
List<CandidateResult> pendingResults = new();
List<CandidateResult> primeResults = new();
int consoleProgress = 0;
while (enumerator.MoveNext())
{
string currentLine = enumerator.Current;
if (string.IsNullOrWhiteSpace(currentLine))
{
continue;
}
while (enumerator.MoveNext())
{
string currentLine = enumerator.Current;
if (string.IsNullOrWhiteSpace(currentLine))
{
continue;
}
CandidateResult result = ParseLine(currentLine);
InsertPendingResult(pendingResults, result);
DrainPrimeMatches(pendingResults, primeResults, ref currentPrime, primeEnumerator, false);
if (++consoleProgress == 10_000)
{
Console.WriteLine($"Processed {result.P}");
CandidateResult result = ParseLine(currentLine);
if (result.P < pMin || result.P > pMax)
{
continue;
}
InsertPendingResult(pendingResults, result);
DrainPrimeMatches(pendingResults, primeResults, ref currentPrime, primeEnumerator, false);
if (++consoleProgress == 10_000)
{
Console.WriteLine($"Processed {result.P}");
consoleProgress = 0;
}
}