first commit

third_party/yaml-cpp/util/parse.cpp

@@ -0,0 +1,46 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+#include "yaml-cpp/eventhandler.h"
+#include "yaml-cpp/yaml.h"  // IWYU pragma: keep
+
+class NullEventHandler : public YAML::EventHandler {
+ public:
+  void OnDocumentStart(const YAML::Mark&) override {}
+  void OnDocumentEnd() override {}
+
+  void OnNull(const YAML::Mark&, YAML::anchor_t) override {}
+  void OnAlias(const YAML::Mark&, YAML::anchor_t) override {}
+  void OnScalar(const YAML::Mark&, const std::string&, YAML::anchor_t,
+                const std::string&) override {}
+
+  void OnSequenceStart(const YAML::Mark&, const std::string&, YAML::anchor_t,
+                       YAML::EmitterStyle::value) override {}
+  void OnSequenceEnd() override {}
+
+  void OnMapStart(const YAML::Mark&, const std::string&, YAML::anchor_t,
+                  YAML::EmitterStyle::value) override {}
+  void OnMapEnd() override {}
+};
+
+void parse(std::istream& input) {
+  try {
+    YAML::Node doc = YAML::Load(input);
+    std::cout << doc << "\n";
+  } catch (const YAML::Exception& e) {
+    std::cerr << e.what() << "\n";
+  }
+}
+
+int main(int argc, char** argv) {
+  if (argc > 1) {
+    std::ifstream fin;
+    fin.open(argv[1]);
+    parse(fin);
+  } else {
+    parse(std::cin);
+  }
+
+  return 0;
+}