From 6e39b49cc2588ace8818a0a0f4508d6ada4bd398 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Thu, 30 Oct 2014 07:25:13 -0700
Subject: [PATCH] Add Json::stream to write Value to a Streambuf

---
 src/ripple/json/impl/json_writer.cpp | 82 ++++++++++++++++++++++++++++
 src/ripple/json/json_value.h         |  8 +++
 2 files changed, 90 insertions(+)

diff --git a/src/ripple/json/impl/json_writer.cpp b/src/ripple/json/impl/json_writer.cpp
index 79834e03f..50d7009fb 100644
--- a/src/ripple/json/impl/json_writer.cpp
+++ b/src/ripple/json/impl/json_writer.cpp
@@ -908,5 +908,87 @@ std::ostream& operator<< ( std::ostream& sout, const Value& root )
     return sout;
 }
 
+//------------------------------------------------------------------------------
+
+namespace detail {
+
+inline
+void
+write_string (write_t write, std::string const& s)
+{
+    write(s.data(), s.size());
+}
+
+void
+write_value (write_t write, Value const& value)
+{
+    switch (value.type())
+    {
+    case nullValue:
+        write("null", 4);
+        break;
+
+    case intValue:
+        write_string(write, valueToString(value.asInt()));
+        break;
+
+    case uintValue:
+        write_string(write, valueToString(value.asUInt()));
+        break;
+
+    case realValue:
+        write_string(write, valueToString(value.asDouble()));
+        break;
+
+    case stringValue:
+        write_string(write, valueToQuotedString(value.asCString()));
+        break;
+
+    case booleanValue:
+        write_string(write, valueToString(value.asBool()));
+        break;
+
+    case arrayValue:
+    {
+        write("[", 1);
+        int const size = value.size();
+        for (int index = 0; index < size; ++index)
+        {
+            if (index > 0)
+                write(",", 1);
+            write_value(write, value[index]);
+        }
+        write("]", 1);
+        break;
+    }
+
+    case objectValue:
+    {
+        Value::Members const members = value.getMemberNames();
+        write("{", 1);
+        for (auto it = members.begin(); it != members.end(); ++it)
+        {
+            std::string const& name = *it;
+            if (it != members.begin())
+                write(",", 1);
+
+            write_string(write, valueToQuotedString(name.c_str()));
+            write(":", 1);
+            write_value(write, value[name]);
+        }
+        write("}", 1);
+        break;
+    }
+    }
+}
+
+} // detail
+
+void
+stream (Json::Value const& jv, write_t write)
+{
+    detail::write_value(write, jv);
+    write("\n", 1);
+}
 
 } // namespace Json
diff --git a/src/ripple/json/json_value.h b/src/ripple/json/json_value.h
index 5912d80dc..877746782 100644
--- a/src/ripple/json/json_value.h
+++ b/src/ripple/json/json_value.h
@@ -23,6 +23,7 @@
 #include <ripple/json/json_config.h>
 #include <ripple/json/json_forwards.h>
 #include <beast/strings/String.h>
+#include <functional>
 #include <map>
 #include <vector>
 
@@ -1082,6 +1083,13 @@ public:
     }
 };
 
+//------------------------------------------------------------------------------
+
+using write_t = std::function<void(void const*, std::size_t)>;
+
+/** Stream compact JSON to the specified function. */
+void
+stream (Json::Value const& jv, write_t write);
 
 } // namespace Json