From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Wed, 20 Sep 2023 02:23:10 -0400
Subject: [PATCH 4/5] Add llvm stream support

---
 .../detail/output/output_adapters.hpp         | 26 +++++++++++++++++++
 include/nlohmann/detail/output/serializer.hpp | 11 ++++++--
 include/nlohmann/json.hpp                     | 24 +++++++++++++++++
 3 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/include/nlohmann/detail/output/output_adapters.hpp b/include/nlohmann/detail/output/output_adapters.hpp
index 626f7c0c85e35ec51a90baa3bdd12cd8df7ba957..2e2e92f9718ec13aaa585955707419f27b2088c6 100644
--- a/include/nlohmann/detail/output/output_adapters.hpp
+++ b/include/nlohmann/detail/output/output_adapters.hpp
@@ -22,6 +22,8 @@
 
 #include <nlohmann/detail/macro_scope.hpp>
 
+#include <wpi/util/raw_ostream.hpp>
+
 NLOHMANN_JSON_NAMESPACE_BEGIN
 namespace detail
 {
@@ -118,6 +120,27 @@ class output_string_adapter : public output_adapter_protocol<CharType>
     StringType& str;
 };
 
+template<typename CharType>
+class raw_ostream_adapter : public output_adapter_protocol<CharType>
+{
+  public:
+    explicit raw_ostream_adapter(raw_ostream& s) noexcept
+        : os(s) {}
+
+
+    void write_character(CharType c) override {
+        os << c;
+    }
+
+    JSON_HEDLEY_NON_NULL(2)
+    void write_characters(const CharType* s, std::size_t length) override {
+        os.write(s, length);
+    }
+
+  private:
+    raw_ostream& os;
+};
+
 template<typename CharType, typename StringType = std::basic_string<CharType>>
 class output_adapter
 {
@@ -134,6 +157,9 @@ class output_adapter
     output_adapter(StringType& s)
         : oa(std::make_shared<output_string_adapter<CharType, StringType>>(s)) {}
 
+    output_adapter(raw_ostream& os)
+        : oa(std::make_shared<raw_ostream_adapter<CharType>>(os)) {}
+
     operator output_adapter_t<CharType>()
     {
         return oa;
diff --git a/include/nlohmann/detail/output/serializer.hpp b/include/nlohmann/detail/output/serializer.hpp
index 39f0a06d8b5725262866eefe5f22cfc3fad805cd..b5d4906f36702835a44d4fc567966d3064e9cbd1 100644
--- a/include/nlohmann/detail/output/serializer.hpp
+++ b/include/nlohmann/detail/output/serializer.hpp
@@ -65,15 +65,22 @@ class serializer
     @param[in] error_handler_  how to react on decoding errors
     */
     serializer(output_adapter_t<char> s, const char ichar,
-               error_handler_t error_handler_ = error_handler_t::strict)
+               error_handler_t error_handler_ = error_handler_t::strict,
+               size_t indent_init_len = 512)
         : o(std::move(s))
         , loc(std::localeconv())
         , thousands_sep(loc->thousands_sep == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->thousands_sep)))
         , decimal_point(loc->decimal_point == nullptr ? '\0' : std::char_traits<char>::to_char_type(* (loc->decimal_point)))
         , indent_char(ichar)
-        , indent_string(512, indent_char)
+        , indent_string(indent_init_len, indent_char)
         , error_handler(error_handler_)
     {}
+    
+    serializer(raw_ostream& os, const char ichar,
+               size_t indent_init_len = 512,
+               error_handler_t error_handler_ = error_handler_t::strict)
+        : serializer(output_adapter<char>(os), ichar, error_handler_, indent_init_len)
+    {}
 
     // delete because of pointer members
     serializer(const serializer&) = delete;
diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 8ece57d4a0fde54b24fb6985d9b455b12df835ac..a89e2151e589663ba487a462c3d15cd247ff06cf 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -1288,6 +1288,24 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
         return result;
     }
 
+    void dump(raw_ostream& os, const int indent = -1,
+                  const char indent_char = ' ',
+                  const bool ensure_ascii = false,
+                  const error_handler_t error_handler = error_handler_t::strict) const {
+      serializer s(os, indent_char);
+
+      if (indent >= 0)
+      {
+          s.dump(*this, true, ensure_ascii, static_cast<unsigned int>(indent));
+      }
+      else
+      {
+          s.dump(*this, false, ensure_ascii, 0);
+      }
+
+      os.flush();
+    }
+
     /// @brief return the type of the JSON value (explicit)
     /// @sa https://json.nlohmann.me/api/basic_json/type/
     constexpr value_t type() const noexcept
@@ -3998,6 +4016,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
         return o << j;
     }
 #endif  // JSON_NO_IO
+    
+    friend raw_ostream& operator<<(raw_ostream& o, const basic_json& j)
+    {
+        j.dump(o, 0);
+        return o;
+    }
     /// @}
 
     /////////////////////