From 02476faeec20616581189c2a822a417bcafffde5 Mon Sep 17 00:00:00 2001
From: kkazuha7 <213830798+kkazuha7@users.noreply.github.com>
Date: Sun, 17 Aug 2025 07:52:17 +0000
Subject: [PATCH 1/2] fix: MagicNumberStringMacro to support custom parsing
 argument

---
 Sources/BinaryParsingMacros/MagicNumberStringMacro.swift | 7 ++++++-
 Tests/BinaryParsingMacrosTests/ParserMacroTests.swift    | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift b/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
index 129bccf..6137e68 100644
--- a/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
+++ b/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
@@ -51,9 +51,14 @@ public struct MagicNumberStringMacro: ExpressionMacro {
       return ""
     }
 
+    var parsingExpr = "input"
+    if let parsingArg = node.arguments.first(where: { $0.label?.text == "parsing" }) {
+      parsingExpr = parsingArg.expression.description
+    }
+
     return """
       _loadAndCheckDirectBytes(\
-      parsing: &input, \
+      parsing: \(raw: parsingExpr), \
       bigEndianValue: 0x\(raw: String(integerValue, radix: 16)) as \(raw: integerType))
       """
   }
diff --git a/Tests/BinaryParsingMacrosTests/ParserMacroTests.swift b/Tests/BinaryParsingMacrosTests/ParserMacroTests.swift
index 482943d..0f072d9 100644
--- a/Tests/BinaryParsingMacrosTests/ParserMacroTests.swift
+++ b/Tests/BinaryParsingMacrosTests/ParserMacroTests.swift
@@ -20,9 +20,9 @@ struct StringifyMacroSwiftTestingTests {
   @Test
   func magicNumberString() {
     assertMacro {
-      #"try #magicNumber("qoif", parsing: &input)"#
+      #"try #magicNumber("qoif", parsing: &data)"#
     } expansion: {
-      "try _loadAndCheckDirectBytes(parsing: &input, bigEndianValue: 0x716f6966 as UInt32)"
+      "try _loadAndCheckDirectBytes(parsing: &data, bigEndianValue: 0x716f6966 as UInt32)"
     }
   }
 }

From 52436dd861e49243b8caf6d29905984d29689f73 Mon Sep 17 00:00:00 2001
From: kkazuha7 <213830798+kkazuha7@users.noreply.github.com>
Date: Wed, 3 Sep 2025 00:21:24 -0400
Subject: [PATCH 2/2] style: fix format issue

---
 Sources/BinaryParsingMacros/MagicNumberStringMacro.swift | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift b/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
index 6137e68..3513353 100644
--- a/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
+++ b/Sources/BinaryParsingMacros/MagicNumberStringMacro.swift
@@ -52,7 +52,9 @@ public struct MagicNumberStringMacro: ExpressionMacro {
     }
 
     var parsingExpr = "input"
-    if let parsingArg = node.arguments.first(where: { $0.label?.text == "parsing" }) {
+    if let parsingArg = node.arguments.first(where: {
+      $0.label?.text == "parsing"
+    }) {
       parsingExpr = parsingArg.expression.description
     }