[Complex Text Layouts] Add third-party TextServer dependencies (ICU, HarfBuzz, Graphite).

1 files changed, 646 insertions, 0 deletions

diff --git a/thirdparty/icu4c/common/unicode/ucptrie.h b/thirdparty/icu4c/common/unicode/ucptrie.h
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+++ b/thirdparty/icu4c/common/unicode/ucptrie.h
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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+// ucptrie.h (modified from utrie2.h)
+// created: 2017dec29 Markus W. Scherer
+
+#ifndef __UCPTRIE_H__
+#define __UCPTRIE_H__
+
+#include "unicode/utypes.h"
+#include "unicode/ucpmap.h"
+#include "unicode/utf8.h"
+
+#if U_SHOW_CPLUSPLUS_API
+#include "unicode/localpointer.h"
+#endif   // U_SHOW_CPLUSPLUS_API
+
+U_CDECL_BEGIN
+
+/**
+ * \file
+ *
+ * This file defines an immutable Unicode code point trie.
+ *
+ * @see UCPTrie
+ * @see UMutableCPTrie
+ */
+
+#ifndef U_IN_DOXYGEN
+/** @internal */
+typedef union UCPTrieData {
+    /** @internal */
+    const void *ptr0;
+    /** @internal */
+    const uint16_t *ptr16;
+    /** @internal */
+    const uint32_t *ptr32;
+    /** @internal */
+    const uint8_t *ptr8;
+} UCPTrieData;
+#endif
+
+/**
+ * Immutable Unicode code point trie structure.
+ * Fast, reasonably compact, map from Unicode code points (U+0000..U+10FFFF) to integer values.
+ * For details see http://site.icu-project.org/design/struct/utrie
+ *
+ * Do not access UCPTrie fields directly; use public functions and macros.
+ * Functions are easy to use: They support all trie types and value widths.
+ *
+ * When performance is really important, macros provide faster access.
+ * Most macros are specific to either "fast" or "small" tries, see UCPTrieType.
+ * There are "fast" macros for special optimized use cases.
+ *
+ * The macros will return bogus values, or may crash, if used on the wrong type or value width.
+ *
+ * @see UMutableCPTrie
+ * @stable ICU 63
+ */
+struct UCPTrie {
+#ifndef U_IN_DOXYGEN
+    /** @internal */
+    const uint16_t *index;
+    /** @internal */
+    UCPTrieData data;
+
+    /** @internal */
+    int32_t indexLength;
+    /** @internal */
+    int32_t dataLength;
+    /** Start of the last range which ends at U+10FFFF. @internal */
+    UChar32 highStart;
+    /** highStart>>12 @internal */
+    uint16_t shifted12HighStart;
+
+    /** @internal */
+    int8_t type;  // UCPTrieType
+    /** @internal */
+    int8_t valueWidth;  // UCPTrieValueWidth
+
+    /** padding/reserved @internal */
+    uint32_t reserved32;
+    /** padding/reserved @internal */
+    uint16_t reserved16;
+
+    /**
+     * Internal index-3 null block offset.
+     * Set to an impossibly high value (e.g., 0xffff) if there is no dedicated index-3 null block.
+     * @internal
+     */
+    uint16_t index3NullOffset;
+    /**
+     * Internal data null block offset, not shifted.
+     * Set to an impossibly high value (e.g., 0xfffff) if there is no dedicated data null block.
+     * @internal
+     */
+    int32_t dataNullOffset;
+    /** @internal */
+    uint32_t nullValue;
+
+#ifdef UCPTRIE_DEBUG
+    /** @internal */
+    const char *name;
+#endif
+#endif
+};
+#ifndef U_IN_DOXYGEN
+typedef struct UCPTrie UCPTrie;
+#endif
+
+/**
+ * Selectors for the type of a UCPTrie.
+ * Different trade-offs for size vs. speed.
+ *
+ * @see umutablecptrie_buildImmutable
+ * @see ucptrie_openFromBinary
+ * @see ucptrie_getType
+ * @stable ICU 63
+ */
+enum UCPTrieType {
+    /**
+     * For ucptrie_openFromBinary() to accept any type.
+     * ucptrie_getType() will return the actual type.
+     * @stable ICU 63
+     */
+    UCPTRIE_TYPE_ANY = -1,
+    /**
+     * Fast/simple/larger BMP data structure. Use functions and "fast" macros.
+     * @stable ICU 63
+     */
+    UCPTRIE_TYPE_FAST,
+    /**
+     * Small/slower BMP data structure. Use functions and "small" macros.
+     * @stable ICU 63
+     */
+    UCPTRIE_TYPE_SMALL
+};
+#ifndef U_IN_DOXYGEN
+typedef enum UCPTrieType UCPTrieType;
+#endif
+
+/**
+ * Selectors for the number of bits in a UCPTrie data value.
+ *
+ * @see umutablecptrie_buildImmutable
+ * @see ucptrie_openFromBinary
+ * @see ucptrie_getValueWidth
+ * @stable ICU 63
+ */
+enum UCPTrieValueWidth {
+    /**
+     * For ucptrie_openFromBinary() to accept any data value width.
+     * ucptrie_getValueWidth() will return the actual data value width.
+     * @stable ICU 63
+     */
+    UCPTRIE_VALUE_BITS_ANY = -1,
+    /**
+     * The trie stores 16 bits per data value.
+     * It returns them as unsigned values 0..0xffff=65535.
+     * @stable ICU 63
+     */
+    UCPTRIE_VALUE_BITS_16,
+    /**
+     * The trie stores 32 bits per data value.
+     * @stable ICU 63
+     */
+    UCPTRIE_VALUE_BITS_32,
+    /**
+     * The trie stores 8 bits per data value.
+     * It returns them as unsigned values 0..0xff=255.
+     * @stable ICU 63
+     */
+    UCPTRIE_VALUE_BITS_8
+};
+#ifndef U_IN_DOXYGEN
+typedef enum UCPTrieValueWidth UCPTrieValueWidth;
+#endif
+
+/**
+ * Opens a trie from its binary form, stored in 32-bit-aligned memory.
+ * Inverse of ucptrie_toBinary().
+ *
+ * The memory must remain valid and unchanged as long as the trie is used.
+ * You must ucptrie_close() the trie once you are done using it.
+ *
+ * @param type selects the trie type; results in an
+ *             U_INVALID_FORMAT_ERROR if it does not match the binary data;
+ *             use UCPTRIE_TYPE_ANY to accept any type
+ * @param valueWidth selects the number of bits in a data value; results in an
+ *                  U_INVALID_FORMAT_ERROR if it does not match the binary data;
+ *                  use UCPTRIE_VALUE_BITS_ANY to accept any data value width
+ * @param data a pointer to 32-bit-aligned memory containing the binary data of a UCPTrie
+ * @param length the number of bytes available at data;
+ *               can be more than necessary
+ * @param pActualLength receives the actual number of bytes at data taken up by the trie data;
+ *                      can be NULL
+ * @param pErrorCode an in/out ICU UErrorCode
+ * @return the trie
+ *
+ * @see umutablecptrie_open
+ * @see umutablecptrie_buildImmutable
+ * @see ucptrie_toBinary
+ * @stable ICU 63
+ */
+U_CAPI UCPTrie * U_EXPORT2
+ucptrie_openFromBinary(UCPTrieType type, UCPTrieValueWidth valueWidth,
+                       const void *data, int32_t length, int32_t *pActualLength,
+                       UErrorCode *pErrorCode);
+
+/**
+ * Closes a trie and releases associated memory.
+ *
+ * @param trie the trie
+ * @stable ICU 63
+ */
+U_CAPI void U_EXPORT2
+ucptrie_close(UCPTrie *trie);
+
+/**
+ * Returns the trie type.
+ *
+ * @param trie the trie
+ * @return the trie type
+ * @see ucptrie_openFromBinary
+ * @see UCPTRIE_TYPE_ANY
+ * @stable ICU 63
+ */
+U_CAPI UCPTrieType U_EXPORT2
+ucptrie_getType(const UCPTrie *trie);
+
+/**
+ * Returns the number of bits in a trie data value.
+ *
+ * @param trie the trie
+ * @return the number of bits in a trie data value
+ * @see ucptrie_openFromBinary
+ * @see UCPTRIE_VALUE_BITS_ANY
+ * @stable ICU 63
+ */
+U_CAPI UCPTrieValueWidth U_EXPORT2
+ucptrie_getValueWidth(const UCPTrie *trie);
+
+/**
+ * Returns the value for a code point as stored in the trie, with range checking.
+ * Returns the trie error value if c is not in the range 0..U+10FFFF.
+ *
+ * Easier to use than UCPTRIE_FAST_GET() and similar macros but slower.
+ * Easier to use because, unlike the macros, this function works on all UCPTrie
+ * objects, for all types and value widths.
+ *
+ * @param trie the trie
+ * @param c the code point
+ * @return the trie value,
+ *         or the trie error value if the code point is not in the range 0..U+10FFFF
+ * @stable ICU 63
+ */
+U_CAPI uint32_t U_EXPORT2
+ucptrie_get(const UCPTrie *trie, UChar32 c);
+
+/**
+ * Returns the last code point such that all those from start to there have the same value.
+ * Can be used to efficiently iterate over all same-value ranges in a trie.
+ * (This is normally faster than iterating over code points and get()ting each value,
+ * but much slower than a data structure that stores ranges directly.)
+ *
+ * If the UCPMapValueFilter function pointer is not NULL, then
+ * the value to be delivered is passed through that function, and the return value is the end
+ * of the range where all values are modified to the same actual value.
+ * The value is unchanged if that function pointer is NULL.
+ *
+ * Example:
+ * \code
+ * UChar32 start = 0, end;
+ * uint32_t value;
+ * while ((end = ucptrie_getRange(trie, start, UCPMAP_RANGE_NORMAL, 0,
+ *                                NULL, NULL, &value)) >= 0) {
+ *     // Work with the range start..end and its value.
+ *     start = end + 1;
+ * }
+ * \endcode
+ *
+ * @param trie the trie
+ * @param start range start
+ * @param option defines whether surrogates are treated normally,
+ *               or as having the surrogateValue; usually UCPMAP_RANGE_NORMAL
+ * @param surrogateValue value for surrogates; ignored if option==UCPMAP_RANGE_NORMAL
+ * @param filter a pointer to a function that may modify the trie data value,
+ *     or NULL if the values from the trie are to be used unmodified
+ * @param context an opaque pointer that is passed on to the filter function
+ * @param pValue if not NULL, receives the value that every code point start..end has;
+ *     may have been modified by filter(context, trie value)
+ *     if that function pointer is not NULL
+ * @return the range end code point, or -1 if start is not a valid code point
+ * @stable ICU 63
+ */
+U_CAPI UChar32 U_EXPORT2
+ucptrie_getRange(const UCPTrie *trie, UChar32 start,
+                 UCPMapRangeOption option, uint32_t surrogateValue,
+                 UCPMapValueFilter *filter, const void *context, uint32_t *pValue);
+
+/**
+ * Writes a memory-mappable form of the trie into 32-bit aligned memory.
+ * Inverse of ucptrie_openFromBinary().
+ *
+ * @param trie the trie
+ * @param data a pointer to 32-bit-aligned memory to be filled with the trie data;
+ *             can be NULL if capacity==0
+ * @param capacity the number of bytes available at data, or 0 for pure preflighting
+ * @param pErrorCode an in/out ICU UErrorCode;
+ *                   U_BUFFER_OVERFLOW_ERROR if the capacity is too small
+ * @return the number of bytes written or (if buffer overflow) needed for the trie
+ *
+ * @see ucptrie_openFromBinary()
+ * @stable ICU 63
+ */
+U_CAPI int32_t U_EXPORT2
+ucptrie_toBinary(const UCPTrie *trie, void *data, int32_t capacity, UErrorCode *pErrorCode);
+
+/**
+ * Macro parameter value for a trie with 16-bit data values.
+ * Use the name of this macro as a "dataAccess" parameter in other macros.
+ * Do not use this macro in any other way.
+ *
+ * @see UCPTRIE_VALUE_BITS_16
+ * @stable ICU 63
+ */
+#define UCPTRIE_16(trie, i) ((trie)->data.ptr16[i])
+
+/**
+ * Macro parameter value for a trie with 32-bit data values.
+ * Use the name of this macro as a "dataAccess" parameter in other macros.
+ * Do not use this macro in any other way.
+ *
+ * @see UCPTRIE_VALUE_BITS_32
+ * @stable ICU 63
+ */
+#define UCPTRIE_32(trie, i) ((trie)->data.ptr32[i])
+
+/**
+ * Macro parameter value for a trie with 8-bit data values.
+ * Use the name of this macro as a "dataAccess" parameter in other macros.
+ * Do not use this macro in any other way.
+ *
+ * @see UCPTRIE_VALUE_BITS_8
+ * @stable ICU 63
+ */
+#define UCPTRIE_8(trie, i) ((trie)->data.ptr8[i])
+
+/**
+ * Returns a trie value for a code point, with range checking.
+ * Returns the trie error value if c is not in the range 0..U+10FFFF.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param c (UChar32, in) the input code point
+ * @return The code point's trie value.
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_CP_INDEX(trie, 0xffff, c))
+
+/**
+ * Returns a 16-bit trie value for a code point, with range checking.
+ * Returns the trie error value if c is not in the range U+0000..U+10FFFF.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_SMALL
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param c (UChar32, in) the input code point
+ * @return The code point's trie value.
+ * @stable ICU 63
+ */
+#define UCPTRIE_SMALL_GET(trie, dataAccess, c) \
+    dataAccess(trie, _UCPTRIE_CP_INDEX(trie, UCPTRIE_SMALL_MAX, c))
+
+/**
+ * UTF-16: Reads the next code point (UChar32 c, out), post-increments src,
+ * and gets a value from the trie.
+ * Sets the trie error value if c is an unpaired surrogate.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param src (const UChar *, in/out) the source text pointer
+ * @param limit (const UChar *, in) the limit pointer for the text, or NULL if NUL-terminated
+ * @param c (UChar32, out) variable for the code point
+ * @param result (out) variable for the trie lookup result
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_U16_NEXT(trie, dataAccess, src, limit, c, result) UPRV_BLOCK_MACRO_BEGIN { \
+    (c) = *(src)++; \
+    int32_t __index; \
+    if (!U16_IS_SURROGATE(c)) { \
+        __index = _UCPTRIE_FAST_INDEX(trie, c); \
+    } else { \
+        uint16_t __c2; \
+        if (U16_IS_SURROGATE_LEAD(c) && (src) != (limit) && U16_IS_TRAIL(__c2 = *(src))) { \
+            ++(src); \
+            (c) = U16_GET_SUPPLEMENTARY((c), __c2); \
+            __index = _UCPTRIE_SMALL_INDEX(trie, c); \
+        } else { \
+            __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \
+        } \
+    } \
+    (result) = dataAccess(trie, __index); \
+} UPRV_BLOCK_MACRO_END
+
+/**
+ * UTF-16: Reads the previous code point (UChar32 c, out), pre-decrements src,
+ * and gets a value from the trie.
+ * Sets the trie error value if c is an unpaired surrogate.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param start (const UChar *, in) the start pointer for the text
+ * @param src (const UChar *, in/out) the source text pointer
+ * @param c (UChar32, out) variable for the code point
+ * @param result (out) variable for the trie lookup result
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_U16_PREV(trie, dataAccess, start, src, c, result) UPRV_BLOCK_MACRO_BEGIN { \
+    (c) = *--(src); \
+    int32_t __index; \
+    if (!U16_IS_SURROGATE(c)) { \
+        __index = _UCPTRIE_FAST_INDEX(trie, c); \
+    } else { \
+        uint16_t __c2; \
+        if (U16_IS_SURROGATE_TRAIL(c) && (src) != (start) && U16_IS_LEAD(__c2 = *((src) - 1))) { \
+            --(src); \
+            (c) = U16_GET_SUPPLEMENTARY(__c2, (c)); \
+            __index = _UCPTRIE_SMALL_INDEX(trie, c); \
+        } else { \
+            __index = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET; \
+        } \
+    } \
+    (result) = dataAccess(trie, __index); \
+} UPRV_BLOCK_MACRO_END
+
+/**
+ * UTF-8: Post-increments src and gets a value from the trie.
+ * Sets the trie error value for an ill-formed byte sequence.
+ *
+ * Unlike UCPTRIE_FAST_U16_NEXT() this UTF-8 macro does not provide the code point
+ * because it would be more work to do so and is often not needed.
+ * If the trie value differs from the error value, then the byte sequence is well-formed,
+ * and the code point can be assembled without revalidation.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param src (const char *, in/out) the source text pointer
+ * @param limit (const char *, in) the limit pointer for the text (must not be NULL)
+ * @param result (out) variable for the trie lookup result
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_U8_NEXT(trie, dataAccess, src, limit, result) UPRV_BLOCK_MACRO_BEGIN { \
+    int32_t __lead = (uint8_t)*(src)++; \
+    if (!U8_IS_SINGLE(__lead)) { \
+        uint8_t __t1, __t2, __t3; \
+        if ((src) != (limit) && \
+            (__lead >= 0xe0 ? \
+                __lead < 0xf0 ?  /* U+0800..U+FFFF except surrogates */ \
+                    U8_LEAD3_T1_BITS[__lead &= 0xf] & (1 << ((__t1 = *(src)) >> 5)) && \
+                    ++(src) != (limit) && (__t2 = *(src) - 0x80) <= 0x3f && \
+                    (__lead = ((int32_t)(trie)->index[(__lead << 6) + (__t1 & 0x3f)]) + __t2, 1) \
+                :  /* U+10000..U+10FFFF */ \
+                    (__lead -= 0xf0) <= 4 && \
+                    U8_LEAD4_T1_BITS[(__t1 = *(src)) >> 4] & (1 << __lead) && \
+                    (__lead = (__lead << 6) | (__t1 & 0x3f), ++(src) != (limit)) && \
+                    (__t2 = *(src) - 0x80) <= 0x3f && \
+                    ++(src) != (limit) && (__t3 = *(src) - 0x80) <= 0x3f && \
+                    (__lead = __lead >= (trie)->shifted12HighStart ? \
+                        (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \
+                        ucptrie_internalSmallU8Index((trie), __lead, __t2, __t3), 1) \
+            :  /* U+0080..U+07FF */ \
+                __lead >= 0xc2 && (__t1 = *(src) - 0x80) <= 0x3f && \
+                (__lead = (int32_t)(trie)->index[__lead & 0x1f] + __t1, 1))) { \
+            ++(src); \
+        } else { \
+            __lead = (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET;  /* ill-formed*/ \
+        } \
+    } \
+    (result) = dataAccess(trie, __lead); \
+} UPRV_BLOCK_MACRO_END
+
+/**
+ * UTF-8: Pre-decrements src and gets a value from the trie.
+ * Sets the trie error value for an ill-formed byte sequence.
+ *
+ * Unlike UCPTRIE_FAST_U16_PREV() this UTF-8 macro does not provide the code point
+ * because it would be more work to do so and is often not needed.
+ * If the trie value differs from the error value, then the byte sequence is well-formed,
+ * and the code point can be assembled without revalidation.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param start (const char *, in) the start pointer for the text
+ * @param src (const char *, in/out) the source text pointer
+ * @param result (out) variable for the trie lookup result
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_U8_PREV(trie, dataAccess, start, src, result) UPRV_BLOCK_MACRO_BEGIN { \
+    int32_t __index = (uint8_t)*--(src); \
+    if (!U8_IS_SINGLE(__index)) { \
+        __index = ucptrie_internalU8PrevIndex((trie), __index, (const uint8_t *)(start), \
+                                              (const uint8_t *)(src)); \
+        (src) -= __index & 7; \
+        __index >>= 3; \
+    } \
+    (result) = dataAccess(trie, __index); \
+} UPRV_BLOCK_MACRO_END
+
+/**
+ * Returns a trie value for an ASCII code point, without range checking.
+ *
+ * @param trie (const UCPTrie *, in) the trie (of either fast or small type)
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param c (UChar32, in) the input code point; must be U+0000..U+007F
+ * @return The ASCII code point's trie value.
+ * @stable ICU 63
+ */
+#define UCPTRIE_ASCII_GET(trie, dataAccess, c) dataAccess(trie, c)
+
+/**
+ * Returns a trie value for a BMP code point (U+0000..U+FFFF), without range checking.
+ * Can be used to look up a value for a UTF-16 code unit if other parts of
+ * the string processing check for surrogates.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param c (UChar32, in) the input code point, must be U+0000..U+FFFF
+ * @return The BMP code point's trie value.
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_BMP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_FAST_INDEX(trie, c))
+
+/**
+ * Returns a trie value for a supplementary code point (U+10000..U+10FFFF),
+ * without range checking.
+ *
+ * @param trie (const UCPTrie *, in) the trie; must have type UCPTRIE_TYPE_FAST
+ * @param dataAccess UCPTRIE_16, UCPTRIE_32, or UCPTRIE_8 according to the trie’s value width
+ * @param c (UChar32, in) the input code point, must be U+10000..U+10FFFF
+ * @return The supplementary code point's trie value.
+ * @stable ICU 63
+ */
+#define UCPTRIE_FAST_SUPP_GET(trie, dataAccess, c) dataAccess(trie, _UCPTRIE_SMALL_INDEX(trie, c))
+
+/* Internal definitions ----------------------------------------------------- */
+
+#ifndef U_IN_DOXYGEN
+
+/**
+ * Internal implementation constants.
+ * These are needed for the API macros, but users should not use these directly.
+ * @internal
+ */
+enum {
+    /** @internal */
+    UCPTRIE_FAST_SHIFT = 6,
+
+    /** Number of entries in a data block for code points below the fast limit. 64=0x40 @internal */
+    UCPTRIE_FAST_DATA_BLOCK_LENGTH = 1 << UCPTRIE_FAST_SHIFT,
+
+    /** Mask for getting the lower bits for the in-fast-data-block offset. @internal */
+    UCPTRIE_FAST_DATA_MASK = UCPTRIE_FAST_DATA_BLOCK_LENGTH - 1,
+
+    /** @internal */
+    UCPTRIE_SMALL_MAX = 0xfff,
+
+    /**
+     * Offset from dataLength (to be subtracted) for fetching the
+     * value returned for out-of-range code points and ill-formed UTF-8/16.
+     * @internal
+     */
+    UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET = 1,
+    /**
+     * Offset from dataLength (to be subtracted) for fetching the
+     * value returned for code points highStart..U+10FFFF.
+     * @internal
+     */
+    UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET = 2
+};
+
+/* Internal functions and macros -------------------------------------------- */
+// Do not conditionalize with #ifndef U_HIDE_INTERNAL_API, needed for public API
+
+/** @internal */
+U_CAPI int32_t U_EXPORT2
+ucptrie_internalSmallIndex(const UCPTrie *trie, UChar32 c);
+
+/** @internal */
+U_CAPI int32_t U_EXPORT2
+ucptrie_internalSmallU8Index(const UCPTrie *trie, int32_t lt1, uint8_t t2, uint8_t t3);
+
+/**
+ * Internal function for part of the UCPTRIE_FAST_U8_PREVxx() macro implementations.
+ * Do not call directly.
+ * @internal
+ */
+U_CAPI int32_t U_EXPORT2
+ucptrie_internalU8PrevIndex(const UCPTrie *trie, UChar32 c,
+                            const uint8_t *start, const uint8_t *src);
+
+/** Internal trie getter for a code point below the fast limit. Returns the data index. @internal */
+#define _UCPTRIE_FAST_INDEX(trie, c) \
+    ((int32_t)(trie)->index[(c) >> UCPTRIE_FAST_SHIFT] + ((c) & UCPTRIE_FAST_DATA_MASK))
+
+/** Internal trie getter for a code point at or above the fast limit. Returns the data index. @internal */
+#define _UCPTRIE_SMALL_INDEX(trie, c) \
+    ((c) >= (trie)->highStart ? \
+        (trie)->dataLength - UCPTRIE_HIGH_VALUE_NEG_DATA_OFFSET : \
+        ucptrie_internalSmallIndex(trie, c))
+
+/**
+ * Internal trie getter for a code point, with checking that c is in U+0000..10FFFF.
+ * Returns the data index.
+ * @internal
+ */
+#define _UCPTRIE_CP_INDEX(trie, fastMax, c) \
+    ((uint32_t)(c) <= (uint32_t)(fastMax) ? \
+        _UCPTRIE_FAST_INDEX(trie, c) : \
+        (uint32_t)(c) <= 0x10ffff ? \
+            _UCPTRIE_SMALL_INDEX(trie, c) : \
+            (trie)->dataLength - UCPTRIE_ERROR_VALUE_NEG_DATA_OFFSET)
+
+U_CDECL_END
+
+#endif  // U_IN_DOXYGEN
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUCPTriePointer
+ * "Smart pointer" class, closes a UCPTrie via ucptrie_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 63
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUCPTriePointer, UCPTrie, ucptrie_close);
+
+U_NAMESPACE_END
+
+#endif  // U_SHOW_CPLUSPLUS_API
+
+#endif