From b720a7fddc06f116808758ef021d9ebfeaa89551 Mon Sep 17 00:00:00 2001
From: David Shah <davey1576@gmail.com>
Date: Sun, 1 Jul 2018 16:40:40 +0200
Subject: [PATCH] Starting to develop a new Python wrapper system

Signed-off-by: David Shah <davey1576@gmail.com>
---
 common/pybindings.h |  4 +-
 common/pywrappers.h | 91 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 2 deletions(-)
 create mode 100644 common/pywrappers.h

diff --git a/common/pybindings.h b/common/pybindings.h
index 4180c2e9..1565a138 100644
--- a/common/pybindings.h
+++ b/common/pybindings.h
@@ -21,14 +21,14 @@
 #ifndef COMMON_PYBINDINGS_H
 #define COMMON_PYBINDINGS_H
 
-#include "pycontainers.h"
-
 #include <Python.h>
 #include <boost/python.hpp>
 #include <boost/python/suite/indexing/map_indexing_suite.hpp>
 #include <boost/python/suite/indexing/vector_indexing_suite.hpp>
 #include <stdexcept>
 #include <utility>
+#include "pycontainers.h"
+#include "pywrappers.h"
 
 #include "nextpnr.h"
 
diff --git a/common/pywrappers.h b/common/pywrappers.h
new file mode 100644
index 00000000..e4391b21
--- /dev/null
+++ b/common/pywrappers.h
@@ -0,0 +1,91 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@symbioticeda.com>
+ *  Copyright (C) 2018  David Shah <david@symbioticeda.com>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef PYWRAPPERS_H
+#define PYWRAPPERS_H
+
+#include <boost/function_types/function_arity.hpp>
+#include <boost/function_types/function_type.hpp>
+#include <boost/function_types/parameter_types.hpp>
+#include <boost/function_types/result_type.hpp>
+#include <boost/python.hpp>
+#include <boost/python/suite/indexing/map_indexing_suite.hpp>
+#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
+#include <utility>
+#include "nextpnr.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+using namespace boost::python;
+
+namespace PythonConversion {
+template <typename T> struct ContextualWrapper
+{
+    Context *ctx;
+    T base;
+
+    ContextualWrapper(Context *c, T &&x) : ctx(c), base(x){};
+
+    operator T() { return base; };
+    typedef T base_type;
+};
+
+// Action options
+class do_nothing
+{
+    template <typename T> T operator()(Context *ctx, T x) { return x; }
+
+    template <typename T> using ret_type = T;
+    template <typename T> using arg_type = T;
+};
+
+class wrap_context
+{
+    template <typename T> ContextualWrapper<T> operator()(Context *ctx, T x) { return ContextualWrapper<T>(ctx, x); }
+
+    template <typename T> using ret_type = ContextualWrapper<T>;
+};
+
+class unwrap_context
+{
+    template <typename T> T operator()(Context *ctx, ContextualWrapper<T> x) { return x.base; }
+
+    template <typename T> using arg_type = ContextualWrapper<T>;
+};
+
+// Function wrapper
+// Example: one parameter, one return
+template <typename Class, typename FuncT, FuncT fn, typename rv_conv, typename arg1_conv> struct function_wrapper
+{
+    using result_type = typename boost::function_types::result_type<FuncT>::type;
+    using arg1_type = typename boost::mpl::at_c<boost::function_types::parameter_types<FuncT>, 1>::type;
+    using class_type = ContextualWrapper<Class>;
+
+    static typename rv_conv::ret_type wrapped_fn(class_type &cls, typename arg1_conv::arg_type arg1)
+    {
+        return rv_conv()(cls.ctx, cls.base.*fn(arg1_conv()(cls.ctx, arg1)));
+    }
+};
+
+} // namespace PythonConversion
+
+NEXTPNR_NAMESPACE_END
+
+#endif