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diff --git a/intl/icu/source/i18n/collationruleparser.h b/intl/icu/source/i18n/collationruleparser.h
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+++ b/intl/icu/source/i18n/collationruleparser.h
@@ -0,0 +1,197 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2013-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationruleparser.h
+*
+* created on: 2013apr10
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATIONRULEPARSER_H__
+#define __COLLATIONRULEPARSER_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/ucol.h"
+#include "unicode/uniset.h"
+#include "unicode/unistr.h"
+
+struct UParseError;
+
+U_NAMESPACE_BEGIN
+
+struct CollationData;
+struct CollationTailoring;
+
+class Locale;
+class Normalizer2;
+
+struct CollationSettings;
+
+class U_I18N_API CollationRuleParser : public UMemory {
+public:
+    /** Special reset positions. */
+    enum Position {
+        FIRST_TERTIARY_IGNORABLE,
+        LAST_TERTIARY_IGNORABLE,
+        FIRST_SECONDARY_IGNORABLE,
+        LAST_SECONDARY_IGNORABLE,
+        FIRST_PRIMARY_IGNORABLE,
+        LAST_PRIMARY_IGNORABLE,
+        FIRST_VARIABLE,
+        LAST_VARIABLE,
+        FIRST_REGULAR,
+        LAST_REGULAR,
+        FIRST_IMPLICIT,
+        LAST_IMPLICIT,
+        FIRST_TRAILING,
+        LAST_TRAILING
+    };
+
+    /**
+     * First character of contractions that encode special reset positions.
+     * U+FFFE cannot be tailored via rule syntax.
+     *
+     * The second contraction character is POS_BASE + Position.
+     */
+    static const UChar POS_LEAD = 0xfffe;
+    /**
+     * Base for the second character of contractions that encode special reset positions.
+     * Braille characters U+28xx are printable and normalization-inert.
+     * @see POS_LEAD
+     */
+    static const UChar POS_BASE = 0x2800;
+
+    class U_I18N_API Sink : public UObject {
+    public:
+        virtual ~Sink();
+        /**
+         * Adds a reset.
+         * strength=UCOL_IDENTICAL for &str.
+         * strength=UCOL_PRIMARY/UCOL_SECONDARY/UCOL_TERTIARY for &[before n]str where n=1/2/3.
+         */
+        virtual void addReset(int32_t strength, const UnicodeString &str,
+                              const char *&errorReason, UErrorCode &errorCode) = 0;
+        /**
+         * Adds a relation with strength and prefix | str / extension.
+         */
+        virtual void addRelation(int32_t strength, const UnicodeString &prefix,
+                                 const UnicodeString &str, const UnicodeString &extension,
+                                 const char *&errorReason, UErrorCode &errorCode) = 0;
+
+        virtual void suppressContractions(const UnicodeSet &set, const char *&errorReason,
+                                          UErrorCode &errorCode);
+
+        virtual void optimize(const UnicodeSet &set, const char *&errorReason,
+                              UErrorCode &errorCode);
+    };
+
+    class U_I18N_API Importer : public UObject {
+    public:
+        virtual ~Importer();
+        virtual void getRules(
+                const char *localeID, const char *collationType,
+                UnicodeString &rules,
+                const char *&errorReason, UErrorCode &errorCode) = 0;
+    };
+
+    /**
+     * Constructor.
+     * The Sink must be set before parsing.
+     * The Importer can be set, otherwise [import locale] syntax is not supported.
+     */
+    CollationRuleParser(const CollationData *base, UErrorCode &errorCode);
+    ~CollationRuleParser();
+
+    /**
+     * Sets the pointer to a Sink object.
+     * The pointer is aliased: Pointer copy without cloning or taking ownership.
+     */
+    void setSink(Sink *sinkAlias) {
+        sink = sinkAlias;
+    }
+
+    /**
+     * Sets the pointer to an Importer object.
+     * The pointer is aliased: Pointer copy without cloning or taking ownership.
+     */
+    void setImporter(Importer *importerAlias) {
+        importer = importerAlias;
+    }
+
+    void parse(const UnicodeString &ruleString,
+               CollationSettings &outSettings,
+               UParseError *outParseError,
+               UErrorCode &errorCode);
+
+    const char *getErrorReason() const { return errorReason; }
+
+    /**
+     * Gets a script or reorder code from its string representation.
+     * @return the script/reorder code, or
+     * -1 if not recognized
+     */
+    static int32_t getReorderCode(const char *word);
+
+private:
+    /** UCOL_PRIMARY=0 .. UCOL_IDENTICAL=15 */
+    static const int32_t STRENGTH_MASK = 0xf;
+    static const int32_t STARRED_FLAG = 0x10;
+    static const int32_t OFFSET_SHIFT = 8;
+
+    void parse(const UnicodeString &ruleString, UErrorCode &errorCode);
+    void parseRuleChain(UErrorCode &errorCode);
+    int32_t parseResetAndPosition(UErrorCode &errorCode);
+    int32_t parseRelationOperator(UErrorCode &errorCode);
+    void parseRelationStrings(int32_t strength, int32_t i, UErrorCode &errorCode);
+    void parseStarredCharacters(int32_t strength, int32_t i, UErrorCode &errorCode);
+    int32_t parseTailoringString(int32_t i, UnicodeString &raw, UErrorCode &errorCode);
+    int32_t parseString(int32_t i, UnicodeString &raw, UErrorCode &errorCode);
+
+    /**
+     * Sets str to a contraction of U+FFFE and (U+2800 + Position).
+     * @return rule index after the special reset position
+     */
+    int32_t parseSpecialPosition(int32_t i, UnicodeString &str, UErrorCode &errorCode);
+    void parseSetting(UErrorCode &errorCode);
+    void parseReordering(const UnicodeString &raw, UErrorCode &errorCode);
+    static UColAttributeValue getOnOffValue(const UnicodeString &s);
+
+    int32_t parseUnicodeSet(int32_t i, UnicodeSet &set, UErrorCode &errorCode);
+    int32_t readWords(int32_t i, UnicodeString &raw) const;
+    int32_t skipComment(int32_t i) const;
+
+    void setParseError(const char *reason, UErrorCode &errorCode);
+    void setErrorContext();
+
+    /**
+     * ASCII [:P:] and [:S:]:
+     * [\u0021-\u002F \u003A-\u0040 \u005B-\u0060 \u007B-\u007E]
+     */
+    static UBool isSyntaxChar(UChar32 c);
+    int32_t skipWhiteSpace(int32_t i) const;
+
+    const Normalizer2 &nfd, &nfc;
+
+    const UnicodeString *rules;
+    const CollationData *const baseData;
+    CollationSettings *settings;
+    UParseError *parseError;
+    const char *errorReason;
+
+    Sink *sink;
+    Importer *importer;
+
+    int32_t ruleIndex;
+};
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATIONRULEPARSER_H__