From 677eb1e1017630a1d1abbb528d28b90110990ef4 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 22 Jan 2024 12:02:41 +0200
Subject: Initial take

---
 libbuild2/json.cxx | 169 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 libbuild2/json.cxx

(limited to 'libbuild2/json.cxx')

diff --git a/libbuild2/json.cxx b/libbuild2/json.cxx
new file mode 100644
index 0000000..0fee8af
--- /dev/null
+++ b/libbuild2/json.cxx
@@ -0,0 +1,169 @@
+// file      : libbuild2/json.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/json.hxx>
+
+#ifndef BUILD2_BOOTSTRAP
+#  include <libbutl/json/parser.hxx>
+#  include <libbutl/json/serializer.hxx>
+#endif
+
+using namespace butl::json;
+
+namespace build2
+{
+#ifndef BUILD2_BOOTSTRAP
+  json_value::
+  json_value (parser& p)
+  {
+    // A JSON input text cannot be empty.
+    //
+    event e (*p.next ());
+
+    switch (e)
+    {
+    case event::begin_object:
+      {
+        container_type c; // For exception safety.
+        while (*p.next () != event::end_object)
+        {
+          string_type n (p.name ());
+          json_value v (p);
+          v.name = move (n);
+          c.push_back (move (v));
+        }
+
+        new (&container) container_type (move (c));
+        type = json_type::object;
+        break;
+      }
+    case event::begin_array:
+      {
+        container_type c; // For exception safety.
+        while (*p.peek () != event::end_array)
+          c.push_back (json_value (p));
+        p.next (); // Consume end_array.
+
+        new (&container) container_type (move (c));
+        type = json_type::array;
+        break;
+      }
+    case event::string:
+      {
+        string_type& s (p.value ());
+
+        // Don't move if small string optimized.
+        //
+        if (s.size () > 15)
+          new (&string) string_type (move (s));
+        else
+          new (&string) string_type (s);
+
+        type = json_type::string;
+        break;
+      }
+    case event::number:
+      {
+        string_type& s (p.value ());
+
+        if (s[0] == '-')
+        {
+          signed_number = p.value<int64_t> ();
+          type = json_type::signed_number;
+        }
+        else
+        {
+          unsigned_number = p.value<uint64_t> ();
+          type = json_type::unsigned_number;
+        }
+
+        break;
+      }
+    case event::boolean:
+      {
+        boolean = p.value<bool> ();
+        type = json_type::boolean;
+        break;
+      }
+    case event::null:
+      {
+        type = json_type::null;
+        break;
+      }
+    case event::name:
+    case event::end_array:
+    case event::end_object:
+      {
+        assert (false);
+        type = json_type::null;
+        break;
+      }
+    }
+  }
+
+  void
+  serialize (buffer_serializer& s, const json_value& v)
+  {
+    if (v.name)
+      s.member_name (*v.name);
+
+    switch (v.type)
+    {
+    case json_type::null:
+      {
+        s.value (nullptr);
+        break;
+      }
+    case json_type::boolean:
+      {
+        s.value (v.boolean);
+        break;
+      }
+    case json_type::signed_number:
+      {
+        s.value (v.signed_number);
+        break;
+      }
+    case json_type::unsigned_number:
+      {
+        s.value (v.unsigned_number);
+        break;
+      }
+    case json_type::string:
+      {
+        s.value (v.string);
+        break;
+      }
+    case json_type::array:
+      {
+        s.begin_array ();
+        for (const json_value& e: v.container)
+          serialize (s, e);
+        s.end_array ();
+        break;
+      }
+    case json_type::object:
+      {
+        s.begin_object ();
+        for (const json_value& m: v.container)
+          serialize (s, m);
+        s.end_object ();
+        break;
+      }
+    }
+  }
+#else
+  json_value::
+  json_value (parser&)
+  {
+    assert (false);
+    type = json_type::null;
+  }
+
+  void
+  serialize (buffer_serializer&, const json_value&)
+  {
+    assert (false);
+  }
+#endif
+}
-- 
cgit v1.1