1 files changed, 105 insertions, 0 deletions
diff --git a/src/s3select/rapidjson/example/messagereader/messagereader.cpp b/src/s3select/rapidjson/example/messagereader/messagereader.cpp
new file mode 100644
index 000000000..3399bc940
--- /dev/null
+++ b/src/s3select/rapidjson/example/messagereader/messagereader.cpp
@@ -0,0 +1,105 @@
+// Reading a message JSON with Reader (SAX-style API).
+// The JSON should be an object with key-string pairs.
+
+#include "rapidjson/reader.h"
+#include "rapidjson/error/en.h"
+#include <iostream>
+#include <string>
+#include <map>
+
+using namespace std;
+using namespace rapidjson;
+
+typedef map<string, string> MessageMap;
+
+#if defined(__GNUC__)
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(effc++)
+#endif
+
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(switch-enum)
+#endif
+
+struct MessageHandler
+    : public BaseReaderHandler<UTF8<>, MessageHandler> {
+    MessageHandler() : messages_(), state_(kExpectObjectStart), name_() {}
+
+    bool StartObject() {
+        switch (state_) {
+        case kExpectObjectStart:
+            state_ = kExpectNameOrObjectEnd;
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    bool String(const char* str, SizeType length, bool) {
+        switch (state_) {
+        case kExpectNameOrObjectEnd:
+            name_ = string(str, length);
+            state_ = kExpectValue;
+            return true;
+        case kExpectValue:
+            messages_.insert(MessageMap::value_type(name_, string(str, length)));
+            state_ = kExpectNameOrObjectEnd;
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    bool EndObject(SizeType) { return state_ == kExpectNameOrObjectEnd; }
+
+    bool Default() { return false; } // All other events are invalid.
+
+    MessageMap messages_;
+    enum State {
+        kExpectObjectStart,
+        kExpectNameOrObjectEnd,
+        kExpectValue
+    }state_;
+    std::string name_;
+};
+
+#if defined(__GNUC__)
+RAPIDJSON_DIAG_POP
+#endif
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
+
+static void ParseMessages(const char* json, MessageMap& messages) {
+    Reader reader;
+    MessageHandler handler;
+    StringStream ss(json);
+    if (reader.Parse(ss, handler))
+        messages.swap(handler.messages_);   // Only change it if success.
+    else {
+        ParseErrorCode e = reader.GetParseErrorCode();
+        size_t o = reader.GetErrorOffset();
+        cout << "Error: " << GetParseError_En(e) << endl;;
+        cout << " at offset " << o << " near '" << string(json).substr(o, 10) << "...'" << endl;
+    }
+}
+
+int main() {
+    MessageMap messages;
+
+    const char* json1 = "{ \"greeting\" : \"Hello!\", \"farewell\" : \"bye-bye!\" }";
+    cout << json1 << endl;
+    ParseMessages(json1, messages);
+
+    for (MessageMap::const_iterator itr = messages.begin(); itr != messages.end(); ++itr)
+        cout << itr->first << ": " << itr->second << endl;
+
+    cout << endl << "Parse a JSON with invalid schema." << endl;
+    const char* json2 = "{ \"greeting\" : \"Hello!\", \"farewell\" : \"bye-bye!\", \"foo\" : {} }";
+    cout << json2 << endl;
+    ParseMessages(json2, messages);
+
+    return 0;
+}