Refactoring: prepare output generators for multi-threaded use

1 files changed, 58 insertions, 0 deletions

diff --git a/src/docvisitor.cpp b/src/docvisitor.cpp
new file mode 100644
index 0000000..664d3ca
--- /dev/null
+++ b/src/docvisitor.cpp
@@ -0,0 +1,58 @@
+/******************************************************************************
+ *
+ * Copyright (C) 1997-2020 by Dimitri van Heesch.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation under the terms of the GNU General Public License is hereby
+ * granted. No representations are made about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ * See the GNU General Public License for more details.
+ *
+ * Documents produced by Doxygen are derivative works derived from the
+ * input used in their production; they are not affected by this license.
+ */
+
+
+#include <unordered_map>
+
+#include "parserintf.h"
+#include "docvisitor.h"
+#include "util.h"
+#include "types.h"
+#include "doxygen.h"
+
+struct DocVisitor::Private
+{
+  int id;
+  std::unordered_map< std::string, std::unique_ptr<CodeParserInterface> > parserFactoryMap;
+};
+
+DocVisitor::DocVisitor(int id) : p(std::make_unique<Private>())
+{
+  p->id = id;
+}
+
+DocVisitor::~DocVisitor()
+{
+}
+
+CodeParserInterface &DocVisitor::getCodeParser(const char *extension)
+{
+  std::string ext(extension?extension:"");
+  // for each extension we create a code parser once per visitor, so that
+  // the context of the same parser object is reused thoughout multiple passes for instance
+  // for code fragments shown via dontinclude.
+  auto it = p->parserFactoryMap.find(ext);
+  if (it==p->parserFactoryMap.end())
+  {
+    auto factory = Doxygen::parserManager->getCodeParserFactory(extension);
+    auto result = p->parserFactoryMap.insert(std::make_pair(ext,factory()));
+    it = result.first;
+  }
+  return *it->second.get();
+}
+
+int DocVisitor::id() const
+{
+  return p->id;
+}