adding ematching engine, fixing seq_unicode

src/ast/euf/euf_mam.h

@@ -0,0 +1,66 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    euf_mam.h
+
+Abstract:
+
+    Matching Abstract Machine
+
+Author:
+
+    Leonardo de Moura (leonardo) 2007-02-13.
+    Nikolaj Bjorner (nbjorner) 2021-01-22.
+
+--*/
+#pragma once
+
+#include "ast/ast.h"
+#include "ast/euf/euf_egraph.h"
+#include <functional>
+
+namespace euf {
+
+    /**
+       \brief Matching Abstract Machine (MAM)
+    */
+    class mam {
+        friend class mam_impl;
+
+        mam() {}
+
+    public:
+
+        static mam * mk(egraph & ctx, 
+                        std::function<void(quantifier*, app*, unsigned, enode* const*, unsigned)>& add_instance);
+        
+        virtual ~mam() {}
+        
+        virtual void add_pattern(quantifier * q, app * mp) = 0;
+
+        virtual void push_scope() = 0;
+
+        virtual void pop_scope(unsigned num_scopes) = 0;
+
+        virtual void match() = 0;
+        
+        virtual void rematch(bool use_irrelevant = false) = 0;
+
+        virtual bool has_work() const = 0;
+        
+        virtual void add_eq_eh(enode * r1, enode * r2) = 0;
+
+        virtual void reset() = 0;
+
+        virtual std::ostream& display(std::ostream& out) = 0;
+        
+        virtual void on_match(quantifier * q, app * pat, unsigned num_bindings, enode * const * bindings, unsigned max_generation) = 0;
+        
+        virtual bool is_shared(enode * n) const = 0;
+
+        virtual bool check_missing_instances() = 0;
+    };
+};
+