Add SepReaderOptions.ColNameComparer

nietras · Mar 20, 2024 · 036b774 · 036b774
1 parent 6757c35
commit 036b774
Show file tree

Hide file tree

Showing 5 changed files with 24 additions and 5 deletions.
diff --git a/README.md b/README.md
@@ -279,6 +279,11 @@ public CultureInfo? CultureInfo { get; init; } = SepDefaults.CultureInfo;
 /// </summary>
 public bool HasHeader { get; init; } = true;
 /// <summary>
+/// Specifies <see cref="IEqualityComparer{T}" /> to use 
+/// for comparing header column names and index look up.
+/// </summary>
+public IEqualityComparer<string> ColNameComparer { get; init; } = SepDefaults.ColNameComparer;
+/// <summary>
 /// Specifies the method factory used to convert a column span 
 /// of `char`s to a `string`.
 /// </summary>
@@ -1500,6 +1505,7 @@ namespace nietras.SeparatedValues
     public delegate nietras.SeparatedValues.SepToString SepCreateToString(nietras.SeparatedValues.SepHeader? maybeHeader, int colCount);
     public static class SepDefaults
     {
+        public static System.StringComparer ColNameComparer { get; }
         public static System.Globalization.CultureInfo CultureInfo { get; }
         public static char Separator { get; }
     }
@@ -1627,6 +1633,7 @@ namespace nietras.SeparatedValues
     {
         public SepReaderOptions() { }
         public SepReaderOptions(nietras.SeparatedValues.Sep? sep) { }
+        public System.Collections.Generic.IEqualityComparer<string> ColNameComparer { get; init; }
         public nietras.SeparatedValues.SepCreateToString CreateToString { get; init; }
         public System.Globalization.CultureInfo? CultureInfo { get; init; }
         public bool DisableColCountCheck { get; init; }

diff --git a/src/Sep/SepDefaults.cs b/src/Sep/SepDefaults.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Globalization;
 
 namespace nietras.SeparatedValues;
@@ -10,6 +11,7 @@ public static class SepDefaults
 
     public static char Separator => _separator;
     public static CultureInfo CultureInfo { get; } = CultureInfo.InvariantCulture;
+    public static StringComparer ColNameComparer { get; } = StringComparer.Ordinal;
 
     internal static IReadOnlyList<char> AutoDetectSeparators { get; } =
         new[] { Separator, '\t', '|', ',' };

diff --git a/src/Sep/SepHeader.cs b/src/Sep/SepHeader.cs
@@ -19,10 +19,13 @@ public SepHeader(string row, Dictionary<string, int> colNameToIndex)
 
     public static SepHeader Empty { get; } = new(string.Empty, new Dictionary<string, int>());
 
-    internal static SepHeader Parse(Sep sep, string line)
+    internal static SepHeader Parse(Sep sep, string line) =>
+        Parse(sep, line, SepDefaults.ColNameComparer);
+
+    internal static SepHeader Parse(Sep sep, string line, IEqualityComparer<string> comparer)
     {
         var colNames = sep.Split(line);
-        var colNameToIndex = new Dictionary<string, int>(colNames.Length);
+        var colNameToIndex = new Dictionary<string, int>(colNames.Length, comparer);
         for (var i = 0; i < colNames.Length; i++)
         {
             var colName = colNames[i];

diff --git a/src/Sep/SepReader.cs b/src/Sep/SepReader.cs
@@ -111,7 +111,7 @@ internal void Initialize(SepReaderOptions options)
             _colCountExpected = firstRowColCount;
             if (options.HasHeader)
             {
-                var colNameToIndex = new Dictionary<string, int>(firstRowColCount);
+                var colNameToIndex = new Dictionary<string, int>(firstRowColCount, options.ColNameComparer);
                 for (var colIndex = 0; colIndex < firstRowColCount; colIndex++)
                 {
                     var colName = ToStringDirect(colIndex);

diff --git a/src/Sep/SepReaderOptions.cs b/src/Sep/SepReaderOptions.cs
@@ -1,4 +1,5 @@
-using System.Globalization;
+using System.Collections.Generic;
+using System.Globalization;
 
 namespace nietras.SeparatedValues;
 
@@ -11,6 +12,7 @@ public SepReaderOptions(Sep? sep)
         Sep = sep;
         CultureInfo = SepDefaults.CultureInfo;
         HasHeader = true;
+        ColNameComparer = SepDefaults.ColNameComparer;
         CreateToString = SepToString.Direct;
         DisableFastFloat = false;
         DisableColCountCheck = false;
@@ -31,6 +33,11 @@ public SepReaderOptions(Sep? sep)
     /// </summary>
     public bool HasHeader { get; init; } = true;
     /// <summary>
+    /// Specifies <see cref="IEqualityComparer{T}" /> to use 
+    /// for comparing header column names and index look up.
+    /// </summary>
+    public IEqualityComparer<string> ColNameComparer { get; init; } = SepDefaults.ColNameComparer;
+    /// <summary>
     /// Specifies the method factory used to convert a column span 
     /// of `char`s to a `string`.
     /// </summary>