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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+*   Copyright (c) 2001-2007, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   11/20/2001  aliu        Creation.
+**********************************************************************
+*/
+#ifndef ESCTRN_H
+#define ESCTRN_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_TRANSLITERATION
+
+#include "unicode/translit.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * A transliterator that converts Unicode characters to an escape
+ * form.  Examples of escape forms are "U+4E01" and "&#x10FFFF;".
+ * Escape forms have a prefix and suffix, either of which may be
+ * empty, a radix, typically 16 or 10, a minimum digit count,
+ * typically 1, 4, or 8, and a boolean that specifies whether
+ * supplemental characters are handled as 32-bit code points or as two
+ * 16-bit code units.  Most escape forms handle 32-bit code points,
+ * but some, such as the Java form, intentionally break them into two
+ * surrogate pairs, for backward compatibility.
+ *
+ * <p>Some escape forms actually have two different patterns, one for
+ * BMP characters (0..FFFF) and one for supplements (>FFFF).  To
+ * handle this, a second EscapeTransliterator may be defined that
+ * specifies the pattern to be produced for supplementals.  An example
+ * of a form that requires this is the C form, which uses "\\uFFFF"
+ * for BMP characters and "\\U0010FFFF" for supplementals.
+ *
+ * <p>This class is package private.  It registers several standard
+ * variants with the system which are then accessed via their IDs.
+ *
+ * @author Alan Liu
+ */
+class EscapeTransliterator : public Transliterator {
+
+ private:
+
+    /**
+     * The prefix of the escape form; may be empty, but usually isn't.
+     */
+    UnicodeString prefix;
+
+    /**
+     * The prefix of the escape form; often empty.
+     */
+    UnicodeString suffix;
+
+    /**
+     * The radix to display the number in.  Typically 16 or 10.  Must
+     * be in the range 2 to 36.
+     */
+    int32_t radix;
+
+    /**
+     * The minimum number of digits.  Typically 1, 4, or 8.  Values
+     * less than 1 are equivalent to 1.
+     */
+    int32_t minDigits;
+
+    /**
+     * If true, supplementals are handled as 32-bit code points.  If
+     * false, they are handled as two 16-bit code units.
+     */
+    UBool grokSupplementals;
+
+    /**
+     * The form to be used for supplementals.  If this is null then
+     * the same form is used for BMP characters and supplementals.  If
+     * this is not null and if grokSupplementals is true then the
+     * prefix, suffix, radix, and minDigits of this object are used
+     * for supplementals.  This pointer is owned.
+     */
+    EscapeTransliterator* supplementalHandler;
+
+ public:
+
+    /**
+     * Registers standard variants with the system.  Called by
+     * Transliterator during initialization.
+     */
+    static void registerIDs();
+
+    /**
+     * Constructs an escape transliterator with the given ID and
+     * parameters.  See the class member documentation for details.
+     */
+    EscapeTransliterator(const UnicodeString& ID,
+                         const UnicodeString& prefix, const UnicodeString& suffix,
+                         int32_t radix, int32_t minDigits,
+                         UBool grokSupplementals,
+                         EscapeTransliterator* adoptedSupplementalHandler);
+
+    /**
+     * Copy constructor.
+     */
+    EscapeTransliterator(const EscapeTransliterator&);
+
+    /**
+     * Destructor.
+     */
+    virtual ~EscapeTransliterator();
+
+    /**
+     * Transliterator API.
+     */
+    virtual Transliterator* clone() const;
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for the actual class.
+     */
+    virtual UClassID getDynamicClassID() const;
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for this class.
+     */
+    U_I18N_API static UClassID U_EXPORT2 getStaticClassID();
+
+ protected:
+
+    /**
+     * Implements {@link Transliterator#handleTransliterate}.
+     */
+    virtual void handleTransliterate(Replaceable& text, UTransPosition& offset,
+                             UBool isIncremental) const;
+
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */
+
+#endif