From 8e2422a0022f5bd8e7d1fe8d1ca7b259451869ea Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 2 Mar 2022 16:27:48 +0200
Subject: Add ability to serialize pre-serialized JSON value

---
 libbutl/json/serializer.cxx |  2 ++
 libbutl/json/serializer.hxx | 12 ++++++++++++
 libbutl/json/serializer.ixx | 15 +++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/libbutl/json/serializer.cxx b/libbutl/json/serializer.cxx
index 84941ed..0e8b566 100644
--- a/libbutl/json/serializer.cxx
+++ b/libbutl/json/serializer.cxx
@@ -283,6 +283,8 @@ namespace butl
           // Fall through.
         case event::number:
           {
+            // Note: this event is also used by value_json_text().
+
             if (st != nullptr && name_expected (*st))
               goto fail_unexpected_event;
 
diff --git a/libbutl/json/serializer.hxx b/libbutl/json/serializer.hxx
index fad91e2..b52bf65 100644
--- a/libbutl/json/serializer.hxx
+++ b/libbutl/json/serializer.hxx
@@ -235,6 +235,18 @@ namespace butl
       void
       value (std::nullptr_t);
 
+      // Serialize value as a pre-serialized JSON value.
+      //
+      // Note that the value is expected to be a valid (and suitable) UTF-8-
+      // encoded JSON text. Note also that if pretty-printing is enabled,
+      // the resulting output may not be correctly indented.
+      //
+      void
+      value_json_text (const char*);
+
+      void
+      value_json_text (const std::string&);
+
       // Serialize next JSON event.
       //
       // If check is false, then don't check whether the value is valid UTF-8
diff --git a/libbutl/json/serializer.ixx b/libbutl/json/serializer.ixx
index 5b2c173..50fe397 100644
--- a/libbutl/json/serializer.ixx
+++ b/libbutl/json/serializer.ixx
@@ -151,6 +151,21 @@ namespace butl
       next (event::null);
     }
 
+    inline void buffer_serializer::
+    value_json_text (const char* v)
+    {
+      // Use event::number (which doesn't involve any quoting) with a disabled
+      // check.
+      //
+      next (event::number, {v, strlen (v)}, false /* check */);
+    }
+
+    inline void buffer_serializer::
+    value_json_text (const std::string& v)
+    {
+      next (event::number, {v.c_str (), v.size ()}, false /* check */);
+    }
+
     inline size_t buffer_serializer::
     to_chars (char* b, size_t s, int v)
     {
-- 
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