plugin work

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/qe/qe_solve_plugin.h

@@ -0,0 +1,52 @@
+/**
+Copyright (c) 2018 Microsoft Corporation
+
+Module Name:
+
+    qe_solve.h
+
+Abstract:
+
+    Light-weight variable solving plugin model for qe-lite and term_graph.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner), Arie Gurfinkel 2018-6-8
+
+Revision History:
+
+
+--*/
+
+#pragma once
+
+#include "ast/ast.h"
+#include "util/plugin_manager.h"
+#include "qe/qe_vartest.h"
+
+namespace qe {
+
+    class solve_plugin {
+    protected:
+        ast_manager&      m;
+        family_id         m_id;
+        is_variable_proc& m_is_var;
+
+        virtual expr_ref solve(expr* atom, bool is_pos) = 0;
+        bool is_variable(expr* e) const { return m_is_var(e); }
+    public:
+        solve_plugin(ast_manager& m, family_id fid, is_variable_proc& is_var) : m(m), m_id(fid), m_is_var(is_var) {}
+        virtual ~solve_plugin() {}
+        family_id get_family_id() const { return m_id; }
+        /// Process (and potentially augment) a literal
+        expr_ref operator() (expr *lit);
+    };
+
+    solve_plugin* mk_arith_solve_plugin(ast_manager& m, is_variable_proc& is_var);
+
+    solve_plugin* mk_dt_solve_plugin(ast_manager& m, is_variable_proc& is_var);
+
+    solve_plugin* mk_bv_solve_plugin(ast_manager& m, is_variable_proc& is_var);
+
+    solve_plugin* mk_array_solve_plugin(ast_manager& m, is_variable_proc& is_var);
+}