From a9c0e1172fe56eb0db7c556a25621076e35b1cb9 Mon Sep 17 00:00:00 2001
From: timerix <timerix11@gmail.com>
Date: Mon, 5 Dec 2022 19:02:09 +0600
Subject: [PATCH] SpanHelper

---
 DTLib/Extensions/SpanHelper.cs | 39 ++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 DTLib/Extensions/SpanHelper.cs

diff --git a/DTLib/Extensions/SpanHelper.cs b/DTLib/Extensions/SpanHelper.cs
new file mode 100644
index 0000000..a5eb440
--- /dev/null
+++ b/DTLib/Extensions/SpanHelper.cs
@@ -0,0 +1,39 @@
+namespace DTLib.Extensions;
+
+#if NETSTANDARD2_1_OR_GREATER || NET2_1_OR_GREATER
+public static class SpanHelper
+{
+    public static ReadOnlySpan<char> After(this ReadOnlySpan<char> span, char c)
+    {
+        var index = span.IndexOf(c);
+        if (index == -1)
+            throw new Exception($"char <{c}> not found in span <{span}>");
+        return span.Slice(index+1);
+    }
+    
+    public static ReadOnlySpan<char> After(this ReadOnlySpan<char> span, ReadOnlySpan<char> s)
+    {
+        var index = span.IndexOf(s);
+        if (index == -1)
+            throw new Exception($"span <{s}> not found in span <{span}>");
+        return span.Slice(index+s.Length);
+    }
+    
+    
+    public static ReadOnlySpan<char> Before(this ReadOnlySpan<char> span, char c)
+    {
+        var index = span.IndexOf(c);
+        if (index == -1)
+            throw new Exception($"char <{c}> not found in span <{span}>");
+        return span.Slice(0,index);
+    }
+    
+    public static ReadOnlySpan<char> Before(this ReadOnlySpan<char> span, ReadOnlySpan<char> s)
+    {
+        var index = span.IndexOf(s);
+        if (index == -1)
+            throw new Exception($"span <{s}> not found in span <{span}>");
+        return span.Slice(0,index);
+    }
+}
+#endif
\ No newline at end of file