From 5e96a1af3136adf6bda8273c85832fa77b0e4e61 Mon Sep 17 00:00:00 2001
From: jahav <havlicek.honza@gmail.com>
Date: Fri, 4 Oct 2024 18:48:00 +0200
Subject: [PATCH] Add Reference.TryParseSheetName

---
 .../ReferenceParserTests.cs                   | 29 ++++++++++++
 src/ClosedXML.Parser/ReferenceParser.cs       | 44 +++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/src/ClosedXML.Parser.Tests/ReferenceParserTests.cs b/src/ClosedXML.Parser.Tests/ReferenceParserTests.cs
index 740209e..9207132 100644
--- a/src/ClosedXML.Parser.Tests/ReferenceParserTests.cs
+++ b/src/ClosedXML.Parser.Tests/ReferenceParserTests.cs
@@ -76,6 +76,35 @@ public void TryParseSheetA1_requires_argument()
         Assert.Throws<ArgumentNullException>(() => ReferenceParser.TryParseSheetA1(null!, out _, out _));
     }
 
+    [Theory]
+    [InlineData("Sheet!Name", "Sheet", "Name")]
+    [InlineData("'Hello World'!Name", "Hello World", "Name")]
+    [InlineData("' John''s World! '!Name", " John's World! ", "Name")]
+    public void TryParseSheetName_parses_sheet_and_name(string text, string expectedSheet, string expectedName)
+    {
+        var success = ReferenceParser.TryParseSheetName(text, out var sheet, out var name);
+
+        Assert.True(success);
+        Assert.Equal(expectedSheet, sheet);
+        Assert.Equal(expectedName, name);
+    }
+
+    [Fact]
+    public void TryParseSheetName_requires_text()
+    {
+        Assert.Throws<ArgumentNullException>(() => ReferenceParser.TryParseSheetName(null!, out _, out _));
+    }
+
+    [Theory]
+    [InlineData("Name")]
+    [InlineData("some_name")]
+    [InlineData("A1")]
+    public void TryParseSheetName_cant_parse_pure_name(string text)
+    {
+        var success = ReferenceParser.TryParseSheetName(text, out _, out _);
+        Assert.False(success);
+    }
+
     public static IEnumerable<object[]> ParseSheetA1TestCases
     {
         get
diff --git a/src/ClosedXML.Parser/ReferenceParser.cs b/src/ClosedXML.Parser/ReferenceParser.cs
index 2b35d59..6787a18 100644
--- a/src/ClosedXML.Parser/ReferenceParser.cs
+++ b/src/ClosedXML.Parser/ReferenceParser.cs
@@ -119,6 +119,50 @@ public static bool TryParseSheetA1(string text, out string sheetName, out Refere
         return true;
     }
 
+    /// <summary>
+    /// Try to parse a text as a sheet name (e.g. <c>Sheet!Name</c>). Doesn't accept pure name
+    /// without sheet (e.g. <c>name</c>).
+    /// </summary>
+    /// <param name="text">Text to parse.</param>
+    /// <param name="sheetName">Parsed sheet name, unescaped.</param>
+    /// <param name="name">Parsed defined name.</param>
+    /// <returns><c>true</c> if parsing was a success, <c>false</c> otherwise.</returns>
+    [PublicAPI]
+    public static bool TryParseSheetName(string text, out string sheetName, out string name)
+    {
+        if (text is null)
+            throw new ArgumentNullException(nameof(text));
+
+        var tokens = RolexLexer.GetTokensA1(text.AsSpan());
+        var isValid = tokens.Count switch
+        {
+            3 => tokens[0].SymbolId == Token.SINGLE_SHEET_PREFIX &&
+                 tokens[1].SymbolId == Token.NAME &&
+                 tokens[2].SymbolId == Token.EofSymbolId,
+            _ => false,
+        };
+        if (!isValid)
+        {
+            sheetName = string.Empty;
+            name = string.Empty;
+            return false;
+        }
+
+        var sheetPrefixToken = tokens[0];
+        var sheetPrefix = text.AsSpan(sheetPrefixToken.StartIndex, sheetPrefixToken.Length);
+        TokenParser.ParseSingleSheetPrefix(sheetPrefix, out int? workbookIndex, out sheetName);
+        if (workbookIndex is not null)
+        {
+            sheetName = string.Empty;
+            name = string.Empty;
+            return false;
+        }
+
+        var nameToken = tokens[1];
+        name = text.AsSpan().Slice(nameToken.StartIndex, nameToken.Length).ToString();
+        return true;
+    }
+
     private static bool IsA1Reference(IReadOnlyList<Token> tokens)
     {
         var isValid = tokens.Count switch