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Edit File : ucharstrie.h \| Size : 22.59 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2010-2012, International Business Machines * Corporation and others. All Rights Reserved. ******************************************************************************* * file name: ucharstrie.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 2010nov14 * created by: Markus W. Scherer / #ifndef __UCHARSTRIE_H__ #define __UCHARSTRIE_H__ /* * \file * \brief C++ API: Trie for mapping Unicode strings (or 16-bit-unit sequences) * to integer values. / #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API #include "unicode/unistr.h" #include "unicode/uobject.h" #include "unicode/ustringtrie.h" U_NAMESPACE_BEGIN class Appendable; class UCharsTrieBuilder; class UVector32; /* * Light-weight, non-const reader class for a UCharsTrie. * Traverses a char16_t-serialized data structure with minimal state, * for mapping strings (16-bit-unit sequences) to non-negative integer values. * * This class owns the serialized trie data only if it was constructed by * the builder's build() method. * The public constructor and the copy constructor only alias the data (only copy the pointer). * There is no assignment operator. * * This class is not intended for public subclassing. * @stable ICU 4.8 / class U_COMMON_API UCharsTrie : public UMemory { public: /* * Constructs a UCharsTrie reader instance. * * The trieUChars must contain a copy of a char16_t sequence from the UCharsTrieBuilder, * starting with the first char16_t of that sequence. * The UCharsTrie object will not read more char16_ts than * the UCharsTrieBuilder generated in the corresponding build() call. * * The array is not copied/cloned and must not be modified while * the UCharsTrie object is in use. * * @param trieUChars The char16_t array that contains the serialized trie. * @stable ICU 4.8 / UCharsTrie(ConstChar16Ptr trieUChars) : ownedArray_(nullptr), uchars_(trieUChars), pos_(uchars_), remainingMatchLength_(-1) {} /* * Destructor. * @stable ICU 4.8 / ~UCharsTrie(); /* * Copy constructor, copies the other trie reader object and its state, * but not the char16_t array which will be shared. (Shallow copy.) * @param other Another UCharsTrie object. * @stable ICU 4.8 / UCharsTrie(const UCharsTrie &other) : ownedArray_(nullptr), uchars_(other.uchars_), pos_(other.pos_), remainingMatchLength_(other.remainingMatchLength_) {} /* * Resets this trie to its initial state. * @return this @stable ICU 4.8 / UCharsTrie &reset() { pos_=uchars_; remainingMatchLength_=-1; return this; } /** * Returns the state of this trie as a 64-bit integer. * The state value is never 0. * * @return opaque state value * @see resetToState64 * @stable ICU 65 / uint64_t getState64() const { return (static_cast<uint64_t>(remainingMatchLength_ + 2) << kState64RemainingShift) \| static_cast<uint64_t>(pos_ - uchars_); } /* * Resets this trie to the saved state. * Unlike resetToState(State), the 64-bit state value * must be from getState64() from the same trie object or * from one initialized the exact same way. * Because of no validation, this method is faster. * * @param state The opaque trie state value from getState64(). * @return this @see getState64 * @see resetToState * @see reset * @stable ICU 65 / UCharsTrie &resetToState64(uint64_t state) { remainingMatchLength_ = static_cast<int32_t>(state >> kState64RemainingShift) - 2; pos_ = uchars_ + (state & kState64PosMask); return this; } /** * UCharsTrie state object, for saving a trie's current state * and resetting the trie back to this state later. * @stable ICU 4.8 / class State : public UMemory { public: /* * Constructs an empty State. * @stable ICU 4.8 / State() { uchars=nullptr; } private: friend class UCharsTrie; const char16_t uchars; const char16_t pos; int32_t remainingMatchLength; }; /* * Saves the state of this trie. * @param state The State object to hold the trie's state. * @return this @see resetToState * @stable ICU 4.8 / const UCharsTrie &saveState(State &state) const { state.uchars=uchars_; state.pos=pos_; state.remainingMatchLength=remainingMatchLength_; return this; } /** * Resets this trie to the saved state. * If the state object contains no state, or the state of a different trie, * then this trie remains unchanged. * @param state The State object which holds a saved trie state. * @return this @see saveState * @see reset * @stable ICU 4.8 / UCharsTrie &resetToState(const State &state) { if(uchars_==state.uchars && uchars_!=nullptr) { pos_=state.pos; remainingMatchLength_=state.remainingMatchLength; } return this; } /** * Determines whether the string so far matches, whether it has a value, * and whether another input char16_t can continue a matching string. * @return The match/value Result. * @stable ICU 4.8 / UStringTrieResult current() const; /* * Traverses the trie from the initial state for this input char16_t. * Equivalent to reset().next(uchar). * @param uchar Input char value. Values below 0 and above 0xffff will never match. * @return The match/value Result. * @stable ICU 4.8 / inline UStringTrieResult first(int32_t uchar) { remainingMatchLength_=-1; return nextImpl(uchars_, uchar); } /* * Traverses the trie from the initial state for the * one or two UTF-16 code units for this input code point. * Equivalent to reset().nextForCodePoint(cp). * @param cp A Unicode code point 0..0x10ffff. * @return The match/value Result. * @stable ICU 4.8 / UStringTrieResult firstForCodePoint(UChar32 cp); /* * Traverses the trie from the current state for this input char16_t. * @param uchar Input char value. Values below 0 and above 0xffff will never match. * @return The match/value Result. * @stable ICU 4.8 / UStringTrieResult next(int32_t uchar); /* * Traverses the trie from the current state for the * one or two UTF-16 code units for this input code point. * @param cp A Unicode code point 0..0x10ffff. * @return The match/value Result. * @stable ICU 4.8 / UStringTrieResult nextForCodePoint(UChar32 cp); /* * Traverses the trie from the current state for this string. * Equivalent to * \code * Result result=current(); * for(each c in s) * if(!USTRINGTRIE_HAS_NEXT(result)) return USTRINGTRIE_NO_MATCH; * result=next(c); * return result; * \endcode * @param s A string. Can be nullptr if length is 0. * @param length The length of the string. Can be -1 if NUL-terminated. * @return The match/value Result. * @stable ICU 4.8 / UStringTrieResult next(ConstChar16Ptr s, int32_t length); /* * Returns a matching string's value if called immediately after * current()/first()/next() returned USTRINGTRIE_INTERMEDIATE_VALUE or USTRINGTRIE_FINAL_VALUE. * getValue() can be called multiple times. * * Do not call getValue() after USTRINGTRIE_NO_MATCH or USTRINGTRIE_NO_VALUE! * @return The value for the string so far. * @stable ICU 4.8 / inline int32_t getValue() const { const char16_t pos=pos_; int32_t leadUnit=pos++; // U_ASSERT(leadUnit>=kMinValueLead); return leadUnit&kValueIsFinal ? readValue(pos, leadUnit&0x7fff) : readNodeValue(pos, leadUnit); } /* * Determines whether all strings reachable from the current state * map to the same value. * @param uniqueValue Receives the unique value, if this function returns true. * (output-only) * @return true if all strings reachable from the current state * map to the same value. * @stable ICU 4.8 / inline UBool hasUniqueValue(int32_t &uniqueValue) const { const char16_t pos=pos_; // Skip the rest of a pending linear-match node. return pos!=nullptr && findUniqueValue(pos+remainingMatchLength_+1, false, uniqueValue); } /** * Finds each char16_t which continues the string from the current state. * That is, each char16_t c for which it would be next(c)!=USTRINGTRIE_NO_MATCH now. * @param out Each next char16_t is appended to this object. * @return the number of char16_ts which continue the string from here * @stable ICU 4.8 / int32_t getNextUChars(Appendable &out) const; /* * Iterator for all of the (string, value) pairs in a UCharsTrie. * @stable ICU 4.8 / class U_COMMON_API Iterator : public UMemory { public: /* * Iterates from the root of a char16_t-serialized UCharsTrie. * @param trieUChars The trie char16_ts. * @param maxStringLength If 0, the iterator returns full strings. * Otherwise, the iterator returns strings with this maximum length. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @stable ICU 4.8 / Iterator(ConstChar16Ptr trieUChars, int32_t maxStringLength, UErrorCode &errorCode); /* * Iterates from the current state of the specified UCharsTrie. * @param trie The trie whose state will be copied for iteration. * @param maxStringLength If 0, the iterator returns full strings. * Otherwise, the iterator returns strings with this maximum length. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @stable ICU 4.8 / Iterator(const UCharsTrie &trie, int32_t maxStringLength, UErrorCode &errorCode); /* * Destructor. * @stable ICU 4.8 / ~Iterator(); /* * Resets this iterator to its initial state. * @return this @stable ICU 4.8 / Iterator &reset(); /* * @return true if there are more elements. * @stable ICU 4.8 / UBool hasNext() const; /* * Finds the next (string, value) pair if there is one. * * If the string is truncated to the maximum length and does not * have a real value, then the value is set to -1. * In this case, this "not a real value" is indistinguishable from * a real value of -1. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @return true if there is another element. * @stable ICU 4.8 / UBool next(UErrorCode &errorCode); /* * @return The string for the last successful next(). * @stable ICU 4.8 / const UnicodeString &getString() const { return str_; } /* * @return The value for the last successful next(). * @stable ICU 4.8 / int32_t getValue() const { return value_; } private: UBool truncateAndStop() { pos_=nullptr; value_=-1; // no real value for str return true; } const char16_t branchNext(const char16_t pos, int32_t length, UErrorCode &errorCode); const char16_t uchars_; const char16_t pos_; const char16_t initialPos_; int32_t remainingMatchLength_; int32_t initialRemainingMatchLength_; UBool skipValue_; // Skip intermediate value which was already delivered. UnicodeString str_; int32_t maxLength_; int32_t value_; // The stack stores pairs of integers for backtracking to another // outbound edge of a branch node. // The first integer is an offset from uchars_. // The second integer has the str_.length() from before the node in bits 15..0, // and the remaining branch length in bits 31..16. // (We could store the remaining branch length minus 1 in bits 30..16 and not use the sign bit, // but the code looks more confusing that way.) UVector32 stack_; }; private: friend class UCharsTrieBuilder; /* * Constructs a UCharsTrie reader instance. * Unlike the public constructor which just aliases an array, * this constructor adopts the builder's array. * This constructor is only called by the builder. / UCharsTrie(char16_t adoptUChars, const char16_t trieUChars) : ownedArray_(adoptUChars), uchars_(trieUChars), pos_(uchars_), remainingMatchLength_(-1) {} // No assignment operator. UCharsTrie &operator=(const UCharsTrie &other) = delete; inline void stop() { pos_=nullptr; } // Reads a compact 32-bit integer. // pos is already after the leadUnit, and the lead unit has bit 15 reset. static inline int32_t readValue(const char16_t pos, int32_t leadUnit) { int32_t value; if(leadUnit<kMinTwoUnitValueLead) { value=leadUnit; } else if(leadUnit<kThreeUnitValueLead) { value=((leadUnit-kMinTwoUnitValueLead)<<16)\|pos; } else { value=(pos[0]<<16)\|pos[1]; } return value; } static inline const char16_t skipValue(const char16_t pos, int32_t leadUnit) { if(leadUnit>=kMinTwoUnitValueLead) { if(leadUnit<kThreeUnitValueLead) { ++pos; } else { pos+=2; } } return pos; } static inline const char16_t skipValue(const char16_t pos) { int32_t leadUnit=pos++; return skipValue(pos, leadUnit&0x7fff); } static inline int32_t readNodeValue(const char16_t pos, int32_t leadUnit) { // U_ASSERT(kMinValueLead<=leadUnit && leadUnit<kValueIsFinal); int32_t value; if(leadUnit<kMinTwoUnitNodeValueLead) { value=(leadUnit>>6)-1; } else if(leadUnit<kThreeUnitNodeValueLead) { value=(((leadUnit&0x7fc0)-kMinTwoUnitNodeValueLead)<<10)\|pos; } else { value=(pos[0]<<16)\|pos[1]; } return value; } static inline const char16_t skipNodeValue(const char16_t pos, int32_t leadUnit) { // U_ASSERT(kMinValueLead<=leadUnit && leadUnit<kValueIsFinal); if(leadUnit>=kMinTwoUnitNodeValueLead) { if(leadUnit<kThreeUnitNodeValueLead) { ++pos; } else { pos+=2; } } return pos; } static inline const char16_t jumpByDelta(const char16_t pos) { int32_t delta=pos++; if(delta>=kMinTwoUnitDeltaLead) { if(delta==kThreeUnitDeltaLead) { delta=(pos[0]<<16)\|pos[1]; pos+=2; } else { delta=((delta-kMinTwoUnitDeltaLead)<<16)\|pos++; } } return pos+delta; } static const char16_t skipDelta(const char16_t pos) { int32_t delta=pos++; if(delta>=kMinTwoUnitDeltaLead) { if(delta==kThreeUnitDeltaLead) { pos+=2; } else { ++pos; } } return pos; } static inline UStringTrieResult valueResult(int32_t node) { return static_cast<UStringTrieResult>(USTRINGTRIE_INTERMEDIATE_VALUE - (node >> 15)); } // Handles a branch node for both next(uchar) and next(string). UStringTrieResult branchNext(const char16_t pos, int32_t length, int32_t uchar); // Requires remainingLength_<0. UStringTrieResult nextImpl(const char16_t pos, int32_t uchar); // Helper functions for hasUniqueValue(). // Recursively finds a unique value (or whether there is not a unique one) // from a branch. static const char16_t findUniqueValueFromBranch(const char16_t pos, int32_t length, UBool haveUniqueValue, int32_t &uniqueValue); // Recursively finds a unique value (or whether there is not a unique one) // starting from a position on a node lead unit. static UBool findUniqueValue(const char16_t pos, UBool haveUniqueValue, int32_t &uniqueValue); // Helper functions for getNextUChars(). // getNextUChars() when pos is on a branch node. static void getNextBranchUChars(const char16_t pos, int32_t length, Appendable &out); // UCharsTrie data structure // // The trie consists of a series of char16_t-serialized nodes for incremental // Unicode string/char16_t sequence matching. (char16_t=16-bit unsigned integer) // The root node is at the beginning of the trie data. // // Types of nodes are distinguished by their node lead unit ranges. // After each node, except a final-value node, another node follows to // encode match values or continue matching further units. // // Node types: // - Final-value node: Stores a 32-bit integer in a compact, variable-length format. // The value is for the string/char16_t sequence so far. // - Match node, optionally with an intermediate value in a different compact format. // The value, if present, is for the string/char16_t sequence so far. // // Aside from the value, which uses the node lead unit's high bits: // // - Linear-match node: Matches a number of units. // - Branch node: Branches to other nodes according to the current input unit. // The node unit is the length of the branch (number of units to select from) // minus 1. It is followed by a sub-node: // - If the length is at most kMaxBranchLinearSubNodeLength, then // there are length-1 (key, value) pairs and then one more comparison unit. // If one of the key units matches, then the value is either a final value for // the string so far, or a "jump" delta to the next node. // If the last unit matches, then matching continues with the next node. // (Values have the same encoding as final-value nodes.) // - If the length is greater than kMaxBranchLinearSubNodeLength, then // there is one unit and one "jump" delta. // If the input unit is less than the sub-node unit, then "jump" by delta to // the next sub-node which will have a length of length/2. // (The delta has its own compact encoding.) // Otherwise, skip the "jump" delta to the next sub-node // which will have a length of length-length/2. // Match-node lead unit values, after masking off intermediate-value bits: // 0000..002f: Branch node. If node!=0 then the length is node+1, otherwise // the length is one more than the next unit. // For a branch sub-node with at most this many entries, we drop down // to a linear search. static const int32_t kMaxBranchLinearSubNodeLength=5; // 0030..003f: Linear-match node, match 1..16 units and continue reading the next node. static const int32_t kMinLinearMatch=0x30; static const int32_t kMaxLinearMatchLength=0x10; // Match-node lead unit bits 14..6 for the optional intermediate value. // If these bits are 0, then there is no intermediate value. // Otherwise, see the NodeValue* constants below. static const int32_t kMinValueLead=kMinLinearMatch+kMaxLinearMatchLength; // 0x0040 static const int32_t kNodeTypeMask=kMinValueLead-1; // 0x003f // A final-value node has bit 15 set. static const int32_t kValueIsFinal=0x8000; // Compact value: After testing and masking off bit 15, use the following thresholds. static const int32_t kMaxOneUnitValue=0x3fff; static const int32_t kMinTwoUnitValueLead=kMaxOneUnitValue+1; // 0x4000 static const int32_t kThreeUnitValueLead=0x7fff; static const int32_t kMaxTwoUnitValue=((kThreeUnitValueLead-kMinTwoUnitValueLead)<<16)-1; // 0x3ffeffff // Compact intermediate-value integer, lead unit shared with a branch or linear-match node. static const int32_t kMaxOneUnitNodeValue=0xff; static const int32_t kMinTwoUnitNodeValueLead=kMinValueLead+((kMaxOneUnitNodeValue+1)<<6); // 0x4040 static const int32_t kThreeUnitNodeValueLead=0x7fc0; static const int32_t kMaxTwoUnitNodeValue= ((kThreeUnitNodeValueLead-kMinTwoUnitNodeValueLead)<<10)-1; // 0xfdffff // Compact delta integers. static const int32_t kMaxOneUnitDelta=0xfbff; static const int32_t kMinTwoUnitDeltaLead=kMaxOneUnitDelta+1; // 0xfc00 static const int32_t kThreeUnitDeltaLead=0xffff; static const int32_t kMaxTwoUnitDelta=((kThreeUnitDeltaLead-kMinTwoUnitDeltaLead)<<16)-1; // 0x03feffff // For getState64(): // The remainingMatchLength_ is -1..14=(kMaxLinearMatchLength=0x10)-2 // so we need at least 5 bits for that. // We add 2 to store it as a positive value 1..16=kMaxLinearMatchLength. static constexpr int32_t kState64RemainingShift = 59; static constexpr uint64_t kState64PosMask = (UINT64_C(1) << kState64RemainingShift) - 1; char16_t ownedArray_; // Fixed value referencing the UCharsTrie words. const char16_t uchars_; // Iterator variables. // Pointer to next trie unit to read. nullptr if no more matches. const char16_t pos_; // Remaining length of a linear-match node, minus 1. Negative if not in such a node. int32_t remainingMatchLength_; }; U_NAMESPACE_END #endif / U_SHOW_CPLUSPLUS_API */ #endif // __UCHARSTRIE_H__ Back

Edit File : ucharstrie.h | Size : 22.59 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2010-2012, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  ucharstrie.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2010nov14
*   created by: Markus W. Scherer
*/

#ifndef __UCHARSTRIE_H__
#define __UCHARSTRIE_H__

/**
 * \file
 * \brief C++ API: Trie for mapping Unicode strings (or 16-bit-unit sequences)
 *                 to integer values.
 */

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/unistr.h"
#include "unicode/uobject.h"
#include "unicode/ustringtrie.h"

U_NAMESPACE_BEGIN

class Appendable;
class UCharsTrieBuilder;
class UVector32;

/**
 * Light-weight, non-const reader class for a UCharsTrie.
 * Traverses a char16_t-serialized data structure with minimal state,
 * for mapping strings (16-bit-unit sequences) to non-negative integer values.
 *
 * This class owns the serialized trie data only if it was constructed by
 * the builder's build() method.
 * The public constructor and the copy constructor only alias the data (only copy the pointer).
 * There is no assignment operator.
 *
 * This class is not intended for public subclassing.
 * @stable ICU 4.8
 */
class U_COMMON_API UCharsTrie : public UMemory {
public:
    /**
     * Constructs a UCharsTrie reader instance.
     *
     * The trieUChars must contain a copy of a char16_t sequence from the UCharsTrieBuilder,
     * starting with the first char16_t of that sequence.
     * The UCharsTrie object will not read more char16_ts than
     * the UCharsTrieBuilder generated in the corresponding build() call.
     *
     * The array is not copied/cloned and must not be modified while
     * the UCharsTrie object is in use.
     *
     * @param trieUChars The char16_t array that contains the serialized trie.
     * @stable ICU 4.8
     */
    UCharsTrie(ConstChar16Ptr trieUChars)
            : ownedArray_(nullptr), uchars_(trieUChars),
              pos_(uchars_), remainingMatchLength_(-1) {}

/**
     * Destructor.
     * @stable ICU 4.8
     */
    ~UCharsTrie();

/**
     * Copy constructor, copies the other trie reader object and its state,
     * but not the char16_t array which will be shared. (Shallow copy.)
     * @param other Another UCharsTrie object.
     * @stable ICU 4.8
     */
    UCharsTrie(const UCharsTrie &other)
            : ownedArray_(nullptr), uchars_(other.uchars_),
              pos_(other.pos_), remainingMatchLength_(other.remainingMatchLength_) {}

/**
     * Resets this trie to its initial state.
     * @return *this
     * @stable ICU 4.8
     */
    UCharsTrie &reset() {
        pos_=uchars_;
        remainingMatchLength_=-1;
        return *this;
    }

/**
     * Returns the state of this trie as a 64-bit integer.
     * The state value is never 0.
     *
     * @return opaque state value
     * @see resetToState64
     * @stable ICU 65
     */
    uint64_t getState64() const {
        return (static_cast<uint64_t>(remainingMatchLength_ + 2) << kState64RemainingShift) |
            static_cast<uint64_t>(pos_ - uchars_);
    }

/**
     * Resets this trie to the saved state.
     * Unlike resetToState(State), the 64-bit state value
     * must be from getState64() from the same trie object or
     * from one initialized the exact same way.
     * Because of no validation, this method is faster.
     *
     * @param state The opaque trie state value from getState64().
     * @return *this
     * @see getState64
     * @see resetToState
     * @see reset
     * @stable ICU 65
     */
    UCharsTrie &resetToState64(uint64_t state) {
        remainingMatchLength_ = static_cast<int32_t>(state >> kState64RemainingShift) - 2;
        pos_ = uchars_ + (state & kState64PosMask);
        return *this;
    }

/**
     * UCharsTrie state object, for saving a trie's current state
     * and resetting the trie back to this state later.
     * @stable ICU 4.8
     */
    class State : public UMemory {
    public:
        /**
         * Constructs an empty State.
         * @stable ICU 4.8
         */
        State() { uchars=nullptr; }
    private:
        friend class UCharsTrie;

const char16_t *uchars;
        const char16_t *pos;
        int32_t remainingMatchLength;
    };

/**
     * Saves the state of this trie.
     * @param state The State object to hold the trie's state.
     * @return *this
     * @see resetToState
     * @stable ICU 4.8
     */
    const UCharsTrie &saveState(State &state) const {
        state.uchars=uchars_;
        state.pos=pos_;
        state.remainingMatchLength=remainingMatchLength_;
        return *this;
    }

/**
     * Resets this trie to the saved state.
     * If the state object contains no state, or the state of a different trie,
     * then this trie remains unchanged.
     * @param state The State object which holds a saved trie state.
     * @return *this
     * @see saveState
     * @see reset
     * @stable ICU 4.8
     */
    UCharsTrie &resetToState(const State &state) {
        if(uchars_==state.uchars && uchars_!=nullptr) {
            pos_=state.pos;
            remainingMatchLength_=state.remainingMatchLength;
        }
        return *this;
    }

/**
     * Determines whether the string so far matches, whether it has a value,
     * and whether another input char16_t can continue a matching string.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    UStringTrieResult current() const;

/**
     * Traverses the trie from the initial state for this input char16_t.
     * Equivalent to reset().next(uchar).
     * @param uchar Input char value. Values below 0 and above 0xffff will never match.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    inline UStringTrieResult first(int32_t uchar) {
        remainingMatchLength_=-1;
        return nextImpl(uchars_, uchar);
    }

/**
     * Traverses the trie from the initial state for the
     * one or two UTF-16 code units for this input code point.
     * Equivalent to reset().nextForCodePoint(cp).
     * @param cp A Unicode code point 0..0x10ffff.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    UStringTrieResult firstForCodePoint(UChar32 cp);

/**
     * Traverses the trie from the current state for this input char16_t.
     * @param uchar Input char value. Values below 0 and above 0xffff will never match.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    UStringTrieResult next(int32_t uchar);

/**
     * Traverses the trie from the current state for the
     * one or two UTF-16 code units for this input code point.
     * @param cp A Unicode code point 0..0x10ffff.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    UStringTrieResult nextForCodePoint(UChar32 cp);

/**
     * Traverses the trie from the current state for this string.
     * Equivalent to
     * \code
     * Result result=current();
     * for(each c in s)
     *   if(!USTRINGTRIE_HAS_NEXT(result)) return USTRINGTRIE_NO_MATCH;
     *   result=next(c);
     * return result;
     * \endcode
     * @param s A string. Can be nullptr if length is 0.
     * @param length The length of the string. Can be -1 if NUL-terminated.
     * @return The match/value Result.
     * @stable ICU 4.8
     */
    UStringTrieResult next(ConstChar16Ptr s, int32_t length);

/**
     * Returns a matching string's value if called immediately after
     * current()/first()/next() returned USTRINGTRIE_INTERMEDIATE_VALUE or USTRINGTRIE_FINAL_VALUE.
     * getValue() can be called multiple times.
     *
     * Do not call getValue() after USTRINGTRIE_NO_MATCH or USTRINGTRIE_NO_VALUE!
     * @return The value for the string so far.
     * @stable ICU 4.8
     */
    inline int32_t getValue() const {
        const char16_t *pos=pos_;
        int32_t leadUnit=*pos++;
        // U_ASSERT(leadUnit>=kMinValueLead);
        return leadUnit&kValueIsFinal ?
            readValue(pos, leadUnit&0x7fff) : readNodeValue(pos, leadUnit);
    }

/**
     * Determines whether all strings reachable from the current state
     * map to the same value.
     * @param uniqueValue Receives the unique value, if this function returns true.
     *                    (output-only)
     * @return true if all strings reachable from the current state
     *         map to the same value.
     * @stable ICU 4.8
     */
    inline UBool hasUniqueValue(int32_t &uniqueValue) const {
        const char16_t *pos=pos_;
        // Skip the rest of a pending linear-match node.
        return pos!=nullptr && findUniqueValue(pos+remainingMatchLength_+1, false, uniqueValue);
    }

/**
     * Finds each char16_t which continues the string from the current state.
     * That is, each char16_t c for which it would be next(c)!=USTRINGTRIE_NO_MATCH now.
     * @param out Each next char16_t is appended to this object.
     * @return the number of char16_ts which continue the string from here
     * @stable ICU 4.8
     */
    int32_t getNextUChars(Appendable &out) const;

/**
     * Iterator for all of the (string, value) pairs in a UCharsTrie.
     * @stable ICU 4.8
     */
    class U_COMMON_API Iterator : public UMemory {
    public:
        /**
         * Iterates from the root of a char16_t-serialized UCharsTrie.
         * @param trieUChars The trie char16_ts.
         * @param maxStringLength If 0, the iterator returns full strings.
         *                        Otherwise, the iterator returns strings with this maximum length.
         * @param errorCode Standard ICU error code. Its input value must
         *                  pass the U_SUCCESS() test, or else the function returns
         *                  immediately. Check for U_FAILURE() on output or use with
         *                  function chaining. (See User Guide for details.)
         * @stable ICU 4.8
         */
        Iterator(ConstChar16Ptr trieUChars, int32_t maxStringLength, UErrorCode &errorCode);

/**
         * Iterates from the current state of the specified UCharsTrie.
         * @param trie The trie whose state will be copied for iteration.
         * @param maxStringLength If 0, the iterator returns full strings.
         *                        Otherwise, the iterator returns strings with this maximum length.
         * @param errorCode Standard ICU error code. Its input value must
         *                  pass the U_SUCCESS() test, or else the function returns
         *                  immediately. Check for U_FAILURE() on output or use with
         *                  function chaining. (See User Guide for details.)
         * @stable ICU 4.8
         */
        Iterator(const UCharsTrie &trie, int32_t maxStringLength, UErrorCode &errorCode);

/**
         * Destructor.
         * @stable ICU 4.8
         */
        ~Iterator();

/**
         * Resets this iterator to its initial state.
         * @return *this
         * @stable ICU 4.8
         */
        Iterator &reset();

/**
         * @return true if there are more elements.
         * @stable ICU 4.8
         */
        UBool hasNext() const;

/**
         * Finds the next (string, value) pair if there is one.
         *
         * If the string is truncated to the maximum length and does not
         * have a real value, then the value is set to -1.
         * In this case, this "not a real value" is indistinguishable from
         * a real value of -1.
         * @param errorCode Standard ICU error code. Its input value must
         *                  pass the U_SUCCESS() test, or else the function returns
         *                  immediately. Check for U_FAILURE() on output or use with
         *                  function chaining. (See User Guide for details.)
         * @return true if there is another element.
         * @stable ICU 4.8
         */
        UBool next(UErrorCode &errorCode);

/**
         * @return The string for the last successful next().
         * @stable ICU 4.8
         */
        const UnicodeString &getString() const { return str_; }
        /**
         * @return The value for the last successful next().
         * @stable ICU 4.8
         */
        int32_t getValue() const { return value_; }

private:
        UBool truncateAndStop() {
            pos_=nullptr;
            value_=-1;  // no real value for str
            return true;
        }

const char16_t *branchNext(const char16_t *pos, int32_t length, UErrorCode &errorCode);

const char16_t *uchars_;
        const char16_t *pos_;
        const char16_t *initialPos_;
        int32_t remainingMatchLength_;
        int32_t initialRemainingMatchLength_;
        UBool skipValue_;  // Skip intermediate value which was already delivered.

UnicodeString str_;
        int32_t maxLength_;
        int32_t value_;

// The stack stores pairs of integers for backtracking to another
        // outbound edge of a branch node.
        // The first integer is an offset from uchars_.
        // The second integer has the str_.length() from before the node in bits 15..0,
        // and the remaining branch length in bits 31..16.
        // (We could store the remaining branch length minus 1 in bits 30..16 and not use the sign bit,
        // but the code looks more confusing that way.)
        UVector32 *stack_;
    };

private:
    friend class UCharsTrieBuilder;

/**
     * Constructs a UCharsTrie reader instance.
     * Unlike the public constructor which just aliases an array,
     * this constructor adopts the builder's array.
     * This constructor is only called by the builder.
     */
    UCharsTrie(char16_t *adoptUChars, const char16_t *trieUChars)
            : ownedArray_(adoptUChars), uchars_(trieUChars),
              pos_(uchars_), remainingMatchLength_(-1) {}

// No assignment operator.
    UCharsTrie &operator=(const UCharsTrie &other) = delete;

inline void stop() {
        pos_=nullptr;
    }

// Reads a compact 32-bit integer.
    // pos is already after the leadUnit, and the lead unit has bit 15 reset.
    static inline int32_t readValue(const char16_t *pos, int32_t leadUnit) {
        int32_t value;
        if(leadUnit<kMinTwoUnitValueLead) {
            value=leadUnit;
        } else if(leadUnit<kThreeUnitValueLead) {
            value=((leadUnit-kMinTwoUnitValueLead)<<16)|*pos;
        } else {
            value=(pos[0]<<16)|pos[1];
        }
        return value;
    }
    static inline const char16_t *skipValue(const char16_t *pos, int32_t leadUnit) {
        if(leadUnit>=kMinTwoUnitValueLead) {
            if(leadUnit<kThreeUnitValueLead) {
                ++pos;
            } else {
                pos+=2;
            }
        }
        return pos;
    }
    static inline const char16_t *skipValue(const char16_t *pos) {
        int32_t leadUnit=*pos++;
        return skipValue(pos, leadUnit&0x7fff);
    }

static inline int32_t readNodeValue(const char16_t *pos, int32_t leadUnit) {
        // U_ASSERT(kMinValueLead<=leadUnit && leadUnit<kValueIsFinal);
        int32_t value;
        if(leadUnit<kMinTwoUnitNodeValueLead) {
            value=(leadUnit>>6)-1;
        } else if(leadUnit<kThreeUnitNodeValueLead) {
            value=(((leadUnit&0x7fc0)-kMinTwoUnitNodeValueLead)<<10)|*pos;
        } else {
            value=(pos[0]<<16)|pos[1];
        }
        return value;
    }
    static inline const char16_t *skipNodeValue(const char16_t *pos, int32_t leadUnit) {
        // U_ASSERT(kMinValueLead<=leadUnit && leadUnit<kValueIsFinal);
        if(leadUnit>=kMinTwoUnitNodeValueLead) {
            if(leadUnit<kThreeUnitNodeValueLead) {
                ++pos;
            } else {
                pos+=2;
            }
        }
        return pos;
    }

static inline const char16_t *jumpByDelta(const char16_t *pos) {
        int32_t delta=*pos++;
        if(delta>=kMinTwoUnitDeltaLead) {
            if(delta==kThreeUnitDeltaLead) {
                delta=(pos[0]<<16)|pos[1];
                pos+=2;
            } else {
                delta=((delta-kMinTwoUnitDeltaLead)<<16)|*pos++;
            }
        }
        return pos+delta;
    }

static const char16_t *skipDelta(const char16_t *pos) {
        int32_t delta=*pos++;
        if(delta>=kMinTwoUnitDeltaLead) {
            if(delta==kThreeUnitDeltaLead) {
                pos+=2;
            } else {
                ++pos;
            }
        }
        return pos;
    }

static inline UStringTrieResult valueResult(int32_t node) {
        return static_cast<UStringTrieResult>(USTRINGTRIE_INTERMEDIATE_VALUE - (node >> 15));
    }

// Handles a branch node for both next(uchar) and next(string).
    UStringTrieResult branchNext(const char16_t *pos, int32_t length, int32_t uchar);

// Requires remainingLength_<0.
    UStringTrieResult nextImpl(const char16_t *pos, int32_t uchar);

// Helper functions for hasUniqueValue().
    // Recursively finds a unique value (or whether there is not a unique one)
    // from a branch.
    static const char16_t *findUniqueValueFromBranch(const char16_t *pos, int32_t length,
                                                  UBool haveUniqueValue, int32_t &uniqueValue);
    // Recursively finds a unique value (or whether there is not a unique one)
    // starting from a position on a node lead unit.
    static UBool findUniqueValue(const char16_t *pos, UBool haveUniqueValue, int32_t &uniqueValue);

// Helper functions for getNextUChars().
    // getNextUChars() when pos is on a branch node.
    static void getNextBranchUChars(const char16_t *pos, int32_t length, Appendable &out);

// UCharsTrie data structure
    //
    // The trie consists of a series of char16_t-serialized nodes for incremental
    // Unicode string/char16_t sequence matching. (char16_t=16-bit unsigned integer)
    // The root node is at the beginning of the trie data.
    //
    // Types of nodes are distinguished by their node lead unit ranges.
    // After each node, except a final-value node, another node follows to
    // encode match values or continue matching further units.
    //
    // Node types:
    //  - Final-value node: Stores a 32-bit integer in a compact, variable-length format.
    //    The value is for the string/char16_t sequence so far.
    //  - Match node, optionally with an intermediate value in a different compact format.
    //    The value, if present, is for the string/char16_t sequence so far.
    //
    //  Aside from the value, which uses the node lead unit's high bits:
    //
    //  - Linear-match node: Matches a number of units.
    //  - Branch node: Branches to other nodes according to the current input unit.
    //    The node unit is the length of the branch (number of units to select from)
    //    minus 1. It is followed by a sub-node:
    //    - If the length is at most kMaxBranchLinearSubNodeLength, then
    //      there are length-1 (key, value) pairs and then one more comparison unit.
    //      If one of the key units matches, then the value is either a final value for
    //      the string so far, or a "jump" delta to the next node.
    //      If the last unit matches, then matching continues with the next node.
    //      (Values have the same encoding as final-value nodes.)
    //    - If the length is greater than kMaxBranchLinearSubNodeLength, then
    //      there is one unit and one "jump" delta.
    //      If the input unit is less than the sub-node unit, then "jump" by delta to
    //      the next sub-node which will have a length of length/2.
    //      (The delta has its own compact encoding.)
    //      Otherwise, skip the "jump" delta to the next sub-node
    //      which will have a length of length-length/2.

// Match-node lead unit values, after masking off intermediate-value bits:

// 0000..002f: Branch node. If node!=0 then the length is node+1, otherwise
    // the length is one more than the next unit.

// For a branch sub-node with at most this many entries, we drop down
    // to a linear search.
    static const int32_t kMaxBranchLinearSubNodeLength=5;

// 0030..003f: Linear-match node, match 1..16 units and continue reading the next node.
    static const int32_t kMinLinearMatch=0x30;
    static const int32_t kMaxLinearMatchLength=0x10;

// Match-node lead unit bits 14..6 for the optional intermediate value.
    // If these bits are 0, then there is no intermediate value.
    // Otherwise, see the *NodeValue* constants below.
    static const int32_t kMinValueLead=kMinLinearMatch+kMaxLinearMatchLength;  // 0x0040
    static const int32_t kNodeTypeMask=kMinValueLead-1;  // 0x003f

// A final-value node has bit 15 set.
    static const int32_t kValueIsFinal=0x8000;

// Compact value: After testing and masking off bit 15, use the following thresholds.
    static const int32_t kMaxOneUnitValue=0x3fff;

static const int32_t kMinTwoUnitValueLead=kMaxOneUnitValue+1;  // 0x4000
    static const int32_t kThreeUnitValueLead=0x7fff;

static const int32_t kMaxTwoUnitValue=((kThreeUnitValueLead-kMinTwoUnitValueLead)<<16)-1;  // 0x3ffeffff

// Compact intermediate-value integer, lead unit shared with a branch or linear-match node.
    static const int32_t kMaxOneUnitNodeValue=0xff;
    static const int32_t kMinTwoUnitNodeValueLead=kMinValueLead+((kMaxOneUnitNodeValue+1)<<6);  // 0x4040
    static const int32_t kThreeUnitNodeValueLead=0x7fc0;

static const int32_t kMaxTwoUnitNodeValue=
        ((kThreeUnitNodeValueLead-kMinTwoUnitNodeValueLead)<<10)-1;  // 0xfdffff

// Compact delta integers.
    static const int32_t kMaxOneUnitDelta=0xfbff;
    static const int32_t kMinTwoUnitDeltaLead=kMaxOneUnitDelta+1;  // 0xfc00
    static const int32_t kThreeUnitDeltaLead=0xffff;

static const int32_t kMaxTwoUnitDelta=((kThreeUnitDeltaLead-kMinTwoUnitDeltaLead)<<16)-1;  // 0x03feffff

// For getState64():
    // The remainingMatchLength_ is -1..14=(kMaxLinearMatchLength=0x10)-2
    // so we need at least 5 bits for that.
    // We add 2 to store it as a positive value 1..16=kMaxLinearMatchLength.
    static constexpr int32_t kState64RemainingShift = 59;
    static constexpr uint64_t kState64PosMask = (UINT64_C(1) << kState64RemainingShift) - 1;

char16_t *ownedArray_;

// Fixed value referencing the UCharsTrie words.
    const char16_t *uchars_;

// Iterator variables.

// Pointer to next trie unit to read. nullptr if no more matches.
    const char16_t *pos_;
    // Remaining length of a linear-match node, minus 1. Negative if not in such a node.
    int32_t remainingMatchLength_;
};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __UCHARSTRIE_H__

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