From 2047676a0e0c01e01188d48b33720b7e2b5c385a Mon Sep 17 00:00:00 2001
From: That_One_Nerd <dev@that-one-nerd.net>
Date: Fri, 7 Jul 2023 14:57:56 -0400
Subject: [PATCH] Added string sections.

---
 Changelog.md                           |   1 +
 Nerd_STF/Extensions/StringExtension.cs | 101 +++++++++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 Nerd_STF/Extensions/StringExtension.cs

diff --git a/Changelog.md b/Changelog.md
index 73565e7..5501c60 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -77,6 +77,7 @@
             + ZScore(Equation, Equation, Equation)
             + InvokeMethod(Equation, MethodInfo, object?[]?)
             + InvokeMathMethod(Equation, string, object?[]?)
+        + StringExtension
     + Helpers
         + CordicHelper
         + MathfHelper
diff --git a/Nerd_STF/Extensions/StringExtension.cs b/Nerd_STF/Extensions/StringExtension.cs
new file mode 100644
index 0000000..d19df3f
--- /dev/null
+++ b/Nerd_STF/Extensions/StringExtension.cs
@@ -0,0 +1,101 @@
+namespace Nerd_STF.Extensions;
+
+public static class StringExtension
+{
+    public static string? GetSection(this string str, string prefix, bool includeFix = true, int startIndex = 0,
+        int? endIndex = null)
+    {
+        endIndex ??= str.Length;
+
+        int start = str.IndexOf(prefix, startIndex);
+        if (start == -1 || start > endIndex.Value) return null;
+
+        int end = str.IndexOf(prefix, start + prefix.Length);
+        if (end == -1) end = str.Length;
+        else if (end > endIndex.Value) end = endIndex.Value;
+
+        if (includeFix)
+        {
+            start += prefix.Length;
+            if (start > end) return null;
+        }
+
+        return str[start..end];
+    }
+    public static string? GetSection(this string str, string prefix, string suffix, bool includeFix = true,
+        int startIndex = 0, int? endIndex = null)
+    {
+        endIndex ??= str.Length;
+
+        int start = str.IndexOf(prefix, startIndex);
+        if (start == -1 || start > endIndex.Value) return null;
+
+        int end = str.IndexOf(suffix, start + prefix.Length);
+        if (end == -1) return null;
+        else if (end > endIndex.Value) end = endIndex.Value;
+
+        if (includeFix) start += prefix.Length;
+        else end += suffix.Length;
+
+        if (start > end) return null;
+
+        return str[start..end];
+    }
+
+    public static string[] GetSections(this string str, string prefix, bool includeFix = true, int startIndex = 0,
+        int? endIndex = null)
+    {
+        endIndex ??= str.Length;
+
+        List<string> sections = new();
+        for (int i = startIndex; i < endIndex && i < str.Length; )
+        {
+            int start = str.IndexOf(prefix, startIndex);
+            if (start == -1 || start > endIndex.Value) break;
+
+            int end = str.IndexOf(prefix, start + prefix.Length);
+            if (end == -1) end = str.Length;
+            else if (end > endIndex.Value) end = endIndex.Value;
+
+            if (includeFix)
+            {
+                start += prefix.Length;
+                if (start > end) break;
+            }
+
+            sections.Add(str[start..end]);
+            i = end;
+        }
+
+        return sections.ToArray();
+    }
+    public static string[] GetSections(this string str, string prefix, string suffix, bool includeFix = true, int startIndex = 0,
+        int? endIndex = null)
+    {
+        endIndex ??= str.Length;
+
+        List<string> sections = new();
+        for (int i = startIndex; i < endIndex && i < str.Length; )
+        {
+            endIndex ??= str.Length;
+
+            int start = str.IndexOf(prefix, i);
+            if (start == -1 || start > endIndex.Value) break;
+
+            int end = str.IndexOf(suffix, start + prefix.Length);
+            if (end == -1) break;
+            else if (end > endIndex.Value) end = endIndex.Value;
+
+            if (includeFix) start += prefix.Length;
+            else end += suffix.Length;
+
+            if (start > end) break;
+
+            i = end;
+
+            sections.Add(str[start..end]);
+        }
+
+        return sections.ToArray();
+    }
+}