add char_decl_plugin

src/ast/char_decl_plugin.h

@@ -0,0 +1,73 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    char_decl_plugin.h
+
+Abstract:
+
+    char_plugin for unicode suppport
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2011-11-14
+
+Revision History:
+
+    Updated to string sequences 2015-12-5
+
+    Add SMTLIB 2.6 support 2020-5-17
+
+--*/
+#pragma once
+
+#include "ast/ast.h"
+#include "ast/bv_decl_plugin.h"
+#include <string>
+
+enum char_sort_kind {
+    CHAR_SORT
+};
+
+enum char_op_kind {
+    OP_CHAR_CONST,
+    OP_CHAR_LE
+};
+
+class char_decl_plugin : public decl_plugin {
+    sort* m_char { nullptr };
+    symbol m_charc_sym;
+
+    void set_manager(ast_manager * m, family_id id) override;
+
+public:
+    char_decl_plugin();
+
+    ~char_decl_plugin() override {}
+
+    void finalize() override {}
+
+    decl_plugin* mk_fresh() override { return alloc(char_decl_plugin); }
+
+    sort* mk_sort(decl_kind k, unsigned num_parameters, parameter const* parameters) override { return m_char; }
+
+    func_decl* mk_func_decl(decl_kind k, unsigned num_parameters, parameter const* parameters,
+        unsigned arity, sort* const* domain, sort* range) override;
+
+    void get_op_names(svector<builtin_name>& op_names, symbol const& logic) override;
+
+    void get_sort_names(svector<builtin_name>& sort_names, symbol const& logic) override;
+
+    bool is_value(app* e) const override;
+
+    bool is_unique_value(app* e) const override;
+
+    bool are_equal(app* a, app* b) const override;
+
+    bool are_distinct(app* a, app* b) const override;
+
+    app* mk_char(unsigned u);
+
+    expr* get_some_value(sort* s) override;
+};