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.

1 files changed, 72 insertions, 0 deletions

diff --git a/tools/slang-cpp-extractor/file-util.cpp b/tools/slang-cpp-extractor/file-util.cpp
new file mode 100644
index 000000000..1d37df650
--- /dev/null
+++ b/tools/slang-cpp-extractor/file-util.cpp
@@ -0,0 +1,72 @@
+#include "file-util.h"
+
+#include "../../source/core/slang-io.h"
+
+namespace CppExtract {
+using namespace Slang;
+
+/* static */SlangResult FileUtil::readAllText(const Slang::String& fileName, DiagnosticSink* sink, String& outRead)
+{
+    try
+    {
+        StreamReader reader(new FileStream(fileName, FileMode::Open, FileAccess::Read, FileShare::ReadWrite));
+        outRead = reader.ReadToEnd();
+    }
+    catch (const IOException&)
+    {
+        if (sink)
+        {
+            sink->diagnose(SourceLoc(), CPPDiagnostics::cannotOpenFile, fileName);
+        }
+        return SLANG_FAIL;
+    }
+    catch (...)
+    {
+        if (sink)
+        {
+            sink->diagnose(SourceLoc(), CPPDiagnostics::cannotOpenFile, fileName);
+        }
+        return SLANG_FAIL;
+    }
+
+    return SLANG_OK;
+}
+
+/* static */SlangResult FileUtil::writeAllText(const Slang::String& fileName, DiagnosticSink* sink, const UnownedStringSlice& text)
+{
+    try
+    {
+        if (File::exists(fileName))
+        {
+            String existingText;
+
+            if (readAllText(fileName, nullptr, existingText) == SLANG_OK)
+            {
+                if (existingText == text)
+                    return SLANG_OK;
+            }
+        }
+        StreamWriter writer(new FileStream(fileName, FileMode::Create));
+        writer.Write(text);
+    }
+    catch (const IOException&)
+    {
+        if (sink)
+        {
+            sink->diagnose(SourceLoc(), CPPDiagnostics::cannotOpenFile, fileName);
+        }
+        return SLANG_FAIL;
+    }
+
+    return SLANG_OK;
+}
+
+/* static */ void FileUtil::indent(Index indentCount, StringBuilder& out)
+{
+    for (Index i = 0; i < indentCount; ++i)
+    {
+        out << CPP_EXTRACT_INDENT_STRING;
+    }
+}
+
+} // namespace CppExtract