From 83f8b6a45fc041586819537ca86be2eb534f79b0 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 16 Mar 2017 18:14:16 +0200
Subject: Implement create meta-operation

---
 build2/config/module.cxx | 66 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 build2/config/module.cxx

(limited to 'build2/config/module.cxx')

diff --git a/build2/config/module.cxx b/build2/config/module.cxx
new file mode 100644
index 0000000..6d54e46
--- /dev/null
+++ b/build2/config/module.cxx
@@ -0,0 +1,66 @@
+// file      : build2/config/module.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <build2/config/module>
+
+using namespace std;
+
+namespace build2
+{
+  namespace config
+  {
+    void module::
+    save_variable (const variable& var, uint64_t flags)
+    {
+      const string& n (var.name);
+
+      // First try to find the module with the name that is the longest
+      // prefix of this variable name.
+      //
+      auto& sm (saved_modules);
+      auto i (sm.end ());
+
+      if (!sm.empty ())
+      {
+        i = sm.upper_bound (n);
+
+        // Get the greatest less than, if any. We might still not be a
+        // suffix. And we still have to check the last element if
+        // upper_bound() returned end().
+        //
+        if (i == sm.begin () || !sm.key_comp ().prefix ((--i)->first, n))
+          i = sm.end ();
+      }
+
+      // If no module matched, then create one based on the variable name.
+      //
+      if (i == sm.end ())
+      {
+        // @@ For now with 'config.' prefix.
+        //
+        i = sm.insert (string (n, 0, n.find ('.', 7)));
+      }
+
+      // Don't insert duplicates. The config.import vars are particularly
+      // susceptible to duplication.
+      //
+      saved_variables& sv (i->second);
+      auto j (sv.find (var));
+
+      if (j == sv.end ())
+        sv.push_back (saved_variable {var, flags});
+      else
+        assert (j->flags == flags);
+    }
+
+    void module::
+    save_module (const char* name, int prio)
+    {
+      saved_modules.insert (string ("config.") += name, prio);
+    }
+
+    const string module::name ("config");
+    const uint64_t module::version (1);
+  }
+}
-- 
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