Add SepReaderHeader.TryIndexOf (#146)

nietras · Jul 11, 2024 · 900506f · 900506f
1 parent 0abb208
commit 900506f
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diff --git a/README.md b/README.md
@@ -1687,6 +1687,7 @@ namespace nietras.SeparatedValues
  public void IndicesOf(System.ReadOnlySpan<string> colNames, System.Span<int> colIndices) { }
  public System.Collections.Generic.IReadOnlyList<string> NamesStartingWith(string prefix, System.StringComparison comparison = 4) { }
  public override string ToString() { }
+ public bool TryIndexOf(string colName, out int colIndex) { }
  }
  public readonly struct SepReaderOptions : System.IEquatable<nietras.SeparatedValues.SepReaderOptions>
  {

diff --git a/src/Sep.Test/SepReaderHeaderTest.cs b/src/Sep.Test/SepReaderHeaderTest.cs
@@ -45,6 +45,13 @@ public void SepReaderHeaderTest_NotEmpty()
  AreEqual([0, 2], header.IndicesOf((ReadOnlySpan<string>)["A", "C"]));
  AreEqual([2, 0], header.IndicesOf((IReadOnlyList<string>)["C", "A"]));
 
+ var tryTrue = header.TryIndexOf("B", out var tryTrueIndex);
+ Assert.IsTrue(tryTrue);
+ Assert.AreEqual(1, tryTrueIndex);
+ var tryFalse = header.TryIndexOf("XX", out var tryFalseIndex);
+ Assert.IsFalse(tryFalse);
+ Assert.AreEqual(0, tryFalseIndex);
+
  var actualIndices = new int[2];
  header.IndicesOf((ReadOnlySpan<string>)["A", "C"], actualIndices);
  AreEqual([0, 2], actualIndices);

diff --git a/src/Sep/SepReaderHeader.cs b/src/Sep/SepReaderHeader.cs
@@ -41,6 +41,8 @@ internal static SepReaderHeader Parse(Sep sep, string line, IEqualityComparer<st
 
  public int IndexOf(string colName) => _colNameToIndex[colName];
 
+ public bool TryIndexOf(string colName, out int colIndex) => _colNameToIndex.TryGetValue(colName, out colIndex);
+
  public IReadOnlyList<string> NamesStartingWith(string prefix, StringComparison comparison = StringComparison.Ordinal)
  {
  var colNames = new List<string>();