// © 2016 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

/*

*******************************************************************************

*   Copyright (C) 2010-2016, International Business Machines

*   Corporation and others.  All Rights Reserved.

*******************************************************************************

*   file name:  ucharstriebuilder.h

*   encoding:   UTF-8

*   tab size:   8 (not used)

*   indentation:4

*

*   created on: 2010nov14

*   created by: Markus W. Scherer

*/

#ifndef __UCHARSTRIEBUILDER_H__

#define __UCHARSTRIEBUILDER_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#include "unicode/stringtriebuilder.h"

#include "unicode/ucharstrie.h"

#include "unicode/unistr.h"

/**

 * \file

 * \brief C++ API: Builder for icu::UCharsTrie

 */

U_NAMESPACE_BEGIN

class UCharsTrieElement;

/**

 * Builder class for UCharsTrie.

 *

 * This class is not intended for public subclassing.

 * @stable ICU 4.8

 */

class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder {

public:

    /**

     * Constructs an empty builder.

     * @param errorCode Standard ICU error code.

     * @stable ICU 4.8

     */

    UCharsTrieBuilder(UErrorCode &errorCode);

    /**

     * Destructor.

     * @stable ICU 4.8

     */

    virtual ~UCharsTrieBuilder();

    /**

     * Adds a (string, value) pair.

     * The string must be unique.

     * The string contents will be copied; the builder does not keep

     * a reference to the input UnicodeString or its buffer.

     * @param s The input string.

     * @param value The value associated with this string.

     * @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 *this

     * @stable ICU 4.8

     */

    UCharsTrieBuilder& add(const UnicodeString& s,

                           int32_t value,

                           UErrorCode& errorCode) U_LIFETIME_BOUND;

    /**

     * Builds a UCharsTrie for the add()ed data.

     * Once built, no further data can be add()ed until clear() is called.

     *

     * A UCharsTrie cannot be empty. At least one (string, value) pair

     * must have been add()ed.

     *

     * This method passes ownership of the builder's internal result array to the new trie object.

     * Another call to any build() variant will re-serialize the trie.

     * After clear() has been called, a new array will be used as well.

     * @param buildOption Build option, see UStringTrieBuildOption.

     * @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 A new UCharsTrie for the add()ed data.

     * @stable ICU 4.8

     */

    UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    /**

     * Builds a UCharsTrie for the add()ed data and char16_t-serializes it.

     * Once built, no further data can be add()ed until clear() is called.

     *

     * A UCharsTrie cannot be empty. At least one (string, value) pair

     * must have been add()ed.

     *

     * Multiple calls to buildUnicodeString() set the UnicodeStrings to the

     * builder's same char16_t array, without rebuilding.

     * If buildUnicodeString() is called after build(), the trie will be

     * re-serialized into a new array (because build() passes on ownership).

     * If build() is called after buildUnicodeString(), the trie object returned

     * by build() will become the owner of the underlying data for the

     * previously returned UnicodeString.

     * After clear() has been called, a new array will be used as well.

     * @param buildOption Build option, see UStringTrieBuildOption.

     * @param result A UnicodeString which will be set to the char16_t-serialized

     *               UCharsTrie for the add()ed data.

     * @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 result

     * @stable ICU 4.8

     */

    UnicodeString& buildUnicodeString(UStringTrieBuildOption buildOption,

                                      UnicodeString& result U_LIFETIME_BOUND,

                                      UErrorCode& errorCode) U_LIFETIME_BOUND;

    /**

     * Removes all (string, value) pairs.

     * New data can then be add()ed and a new trie can be built.

     * @return *this

     * @stable ICU 4.8

     */

    UCharsTrieBuilder& clear() U_LIFETIME_BOUND {

        strings.remove();

        elementsLength=0;

        ucharsLength=0;

        return *this;

    }

private:

    UCharsTrieBuilder(const UCharsTrieBuilder &other) = delete;  // no copy constructor

    UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other) = delete;  // no assignment operator

    void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    virtual int32_t getElementStringLength(int32_t i) const override;

    virtual char16_t getElementUnit(int32_t i, int32_t unitIndex) const override;

    virtual int32_t getElementValue(int32_t i) const override;

    virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const override;

    virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const override;

    virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const override;

    virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, char16_t unit) const override;

    virtual UBool matchNodesCanHaveValues() const override { return true; }

    virtual int32_t getMaxBranchLinearSubNodeLength() const override { return UCharsTrie::kMaxBranchLinearSubNodeLength; }

    virtual int32_t getMinLinearMatch() const override { return UCharsTrie::kMinLinearMatch; }

    virtual int32_t getMaxLinearMatchLength() const override { return UCharsTrie::kMaxLinearMatchLength; }

    class UCTLinearMatchNode : public LinearMatchNode {

    public:

        UCTLinearMatchNode(const char16_t *units, int32_t len, Node *nextNode);

        virtual bool operator==(const Node &other) const override;

        virtual void write(StringTrieBuilder &builder) override;

    private:

        const char16_t *s;

    };

    virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,

                                        Node *nextNode) const override;

    UBool ensureCapacity(int32_t length);

    virtual int32_t write(int32_t unit) override;

    int32_t write(const char16_t *s, int32_t length);

    virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length) override;

    virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) override;

    virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) override;

    virtual int32_t writeDeltaTo(int32_t jumpTarget) override;

    UnicodeString strings;

    UCharsTrieElement *elements;

    int32_t elementsCapacity;

    int32_t elementsLength;

    // char16_t serialization of the trie.

    // Grows from the back: ucharsLength measures from the end of the buffer!

    char16_t *uchars;

    int32_t ucharsCapacity;

    int32_t ucharsLength;

};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __UCHARSTRIEBUILDER_H__