From fe00c5a96e4db3c70615e805b17a527728e94fc6 Mon Sep 17 00:00:00 2001
From: Nicolas Guillot <nicolas.guillot@myscript.com>
Date: Wed, 1 Oct 2025 10:30:03 +0200
Subject: [PATCH] add iiiint LaTeX command support

---
 .../MathRender/MTMathAtomFactory.swift          |  1 +
 .../SwiftMathTests/MTMathListBuilderTests.swift | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/Sources/SwiftMath/MathRender/MTMathAtomFactory.swift b/Sources/SwiftMath/MathRender/MTMathAtomFactory.swift
index fc4d9ff..81f0d4c 100644
--- a/Sources/SwiftMath/MathRender/MTMathAtomFactory.swift
+++ b/Sources/SwiftMath/MathRender/MTMathAtomFactory.swift
@@ -331,6 +331,7 @@ public class MTMathAtomFactory {
         "int" : MTMathAtomFactory.operatorWithName( "\u{222B}", limits: false),
         "iint" : MTMathAtomFactory.operatorWithName( "\u{222C}", limits: false),
         "iiint" : MTMathAtomFactory.operatorWithName( "\u{222D}", limits: false),
+        "iiiint" : MTMathAtomFactory.operatorWithName( "\u{2A0C}", limits: false),
         "oint" : MTMathAtomFactory.operatorWithName( "\u{222E}", limits: false),
         "bigwedge" : MTMathAtomFactory.operatorWithName( "\u{22C0}", limits: true),
         "bigvee" : MTMathAtomFactory.operatorWithName( "\u{22C1}", limits: true),
diff --git a/Tests/SwiftMathTests/MTMathListBuilderTests.swift b/Tests/SwiftMathTests/MTMathListBuilderTests.swift
index accc7c9..b051a38 100644
--- a/Tests/SwiftMathTests/MTMathListBuilderTests.swift
+++ b/Tests/SwiftMathTests/MTMathListBuilderTests.swift
@@ -2286,12 +2286,25 @@ final class MTMathListBuilderTests: XCTestCase {
             var error: NSError? = nil
             let list = MTMathListBuilder.build(fromString: latex, error: &error)
 
-            if list == nil || error != nil {
-                throw XCTSkip("Multiple integral symbols (\\iint, \\iiint) not implemented: \(desc). Error: \(error?.localizedDescription ?? "nil result")")
+            if let err = error {
+                XCTFail("ERROR: \(err.localizedDescription)")
+            } else if list == nil {
+                XCTFail("List is nil but no error")
             }
 
             let unwrappedList = try XCTUnwrap(list, "Should parse: \(desc)")
+            XCTAssertNil(error, "Should not error on \(desc): \(error?.localizedDescription ?? "")")
             XCTAssertTrue(unwrappedList.atoms.count >= 1, "\(desc) should have atoms")
+
+            // Verify we have a large operator (integral) in the list
+            var foundOperator = false
+            for atom in unwrappedList.atoms {
+                if atom.type == .largeOperator {
+                    foundOperator = true
+                    break
+                }
+            }
+            XCTAssertTrue(foundOperator, "\(desc) should contain a large operator (integral)")
         }
     }