C++ extractor improvements (#1803)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Split of NodeTree.
Split out FileUtil.
Split out MacroWriter.

* Rename slang-cpp-extractor-main.cpp -> cpp-extractor-main.cpp

* First pass at extractor unit-tests

* Initial parsing of enum.

* Ability to disable/enable parsing of scope types.

* Initial support for typedef.

* Added operator== != to ArrayVIew.
Added test for splitting to unit tests.

* Improve comment in StringUtil.

* Fix comment.

* Fix typo.

2 files changed, 25 insertions, 8 deletions

diff --git a/source/compiler-core/slang-diagnostic-sink.cpp b/source/compiler-core/slang-diagnostic-sink.cpp
index 2adf31f69..727c322a5 100644
--- a/source/compiler-core/slang-diagnostic-sink.cpp
+++ b/source/compiler-core/slang-diagnostic-sink.cpp
@@ -385,6 +385,23 @@ static void formatDiagnostic(
     }
 }
 
+void DiagnosticSink::init(SourceManager* sourceManager, SourceLocationLexer sourceLocationLexer)
+{
+    m_errorCount = 0;
+    m_internalErrorLocsNoted = 0;
+
+    m_flags = 0;
+
+    m_sourceManager = sourceManager;
+    m_sourceLocationLexer = sourceLocationLexer;
+
+    // If we have a source location lexer, we'll by default enable source location output
+    if (sourceLocationLexer)
+    {
+        setFlag(Flag::SourceLocationLine);
+    }
+}
+
 void DiagnosticSink::diagnoseImpl(SourceLoc const& pos, DiagnosticInfo const& info, int argCount, DiagnosticArg const* const* args)
 {
     StringBuilder sb;
diff --git a/source/compiler-core/slang-diagnostic-sink.h b/source/compiler-core/slang-diagnostic-sink.h
index 84001e6f5..347ff761c 100644
--- a/source/compiler-core/slang-diagnostic-sink.h
+++ b/source/compiler-core/slang-diagnostic-sink.h
@@ -217,16 +217,16 @@ public:
         /// character caret at location
     SourceLocationLexer getSourceLocationLexer() const { return m_sourceLocationLexer; }
 
+        /// Initialize state. 
+    void init(SourceManager* sourceManager, SourceLocationLexer sourceLocationLexer);
+
         /// Ctor
-    DiagnosticSink(SourceManager* sourceManager, SourceLocationLexer sourceLocationLexer)
-        : m_sourceManager(sourceManager),
-            m_sourceLocationLexer(sourceLocationLexer)
+    DiagnosticSink(SourceManager* sourceManager, SourceLocationLexer sourceLocationLexer) { init(sourceManager, sourceLocationLexer); }
+        /// Default Ctor
+    DiagnosticSink():
+        m_sourceManager(nullptr),
+        m_sourceLocationLexer (nullptr)
     {
-        // If we have a source location lexer, we'll by default enable source location output
-        if (sourceLocationLexer)
-        {
-            setFlag(Flag::SourceLocationLine);
-        }
     }
 
     // Public members