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+/*********************                                                        */
+/*! \file strings_rewriter.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds, Andres Noetzli, Tianyi Liang
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Rewrite rules for string-specific operators in theory of strings
+ **
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef CVC4__THEORY__STRINGS__STRINGS_REWRITER_H
+#define CVC4__THEORY__STRINGS__STRINGS_REWRITER_H
+
+#include "expr/node.h"
+#include "theory/strings/sequences_rewriter.h"
+
+namespace CVC4 {
+namespace theory {
+namespace strings {
+
+/**
+ * An extension of SequencesRewriter that handles operators that
+ * are specific to strings (and cannot be applied to sequences).
+ */
+class StringsRewriter : public SequencesRewriter
+{
+ public:
+  /** rewrite string to integer
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.to_int( s )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteStrToInt(Node n);
+
+  /** rewrite integer to string
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.from_int( i )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteIntToStr(Node n);
+
+  /** rewrite string convert
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.tolower( s ) and str.toupper( s )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteStrConvert(Node n);
+
+  /** rewrite string less than or equal
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.<=( t, s )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteStringLeq(Node n);
+
+  /** rewrite str.from_code
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.from_code( t )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteStringFromCode(Node n);
+
+  /** rewrite str.to_code
+   *
+   * This is the entry point for post-rewriting terms n of the form
+   *   str.to_code( t )
+   * Returns the rewritten form of n.
+   */
+  static Node rewriteStringToCode(Node n);
+};
+
+}  // namespace strings
+}  // namespace theory
+}  // namespace CVC4
+
+#endif /* CVC4__THEORY__STRINGS__STRINGS_REWRITER_H */