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

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

/*

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

*

*   Copyright (C) 2011, International Business Machines

*   Corporation and others.  All Rights Reserved.

*

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

*   file name:  uniset_closure.cpp

*   encoding:   UTF-8

*   tab size:   8 (not used)

*   indentation:4

*

*   created on: 2011may30

*   created by: Markus W. Scherer

*

*   UnicodeSet::closeOver() and related methods moved here from uniset_props.cpp

*   to simplify dependencies.

*   In particular, this depends on the BreakIterator, but the BreakIterator

*   code also builds UnicodeSets from patterns and needs uniset_props.

*/

#include "unicode/brkiter.h"

#include "unicode/locid.h"

#include "unicode/parsepos.h"

#include "unicode/uniset.h"

#include "cmemory.h"

#include "ruleiter.h"

#include "ucase.h"

#include "util.h"

#include "uvector.h"

U_NAMESPACE_BEGIN

// TODO memory debugging provided inside uniset.cpp

// could be made available here but probably obsolete with use of modern

// memory leak checker tools

#define _dbgct(me)

//----------------------------------------------------------------

// Constructors &c

//----------------------------------------------------------------

UnicodeSet::UnicodeSet(const UnicodeString& pattern,

                       uint32_t options,

                       const SymbolTable* symbols,

                       UErrorCode& status) {

    applyPattern(pattern, options, symbols, status);

    _dbgct(this);

}

UnicodeSet::UnicodeSet(const UnicodeString& pattern, ParsePosition& pos,

                       uint32_t options,

                       const SymbolTable* symbols,

                       UErrorCode& status) {

    applyPattern(pattern, pos, options, symbols, status);

    _dbgct(this);

}

//----------------------------------------------------------------

// Public API

//----------------------------------------------------------------

UnicodeSet& UnicodeSet::applyPattern(const UnicodeString& pattern,

                                     uint32_t options,

                                     const SymbolTable* symbols,

                                     UErrorCode& status) {

    ParsePosition pos(0);

    applyPattern(pattern, pos, options, symbols, status);

    if (U_FAILURE(status)) return *this;

    int32_t i = pos.getIndex();

    if (options & USET_IGNORE_SPACE) {

        // Skip over trailing whitespace

        ICU_Utility::skipWhitespace(pattern, i, TRUE);

    }

    if (i != pattern.length()) {

        status = U_ILLEGAL_ARGUMENT_ERROR;

    }

    return *this;

}

UnicodeSet& UnicodeSet::applyPattern(const UnicodeString& pattern,

                              ParsePosition& pos,

                              uint32_t options,

                              const SymbolTable* symbols,

                              UErrorCode& status) {

    if (U_FAILURE(status)) {

        return *this;

    }

    if (isFrozen()) {

        status = U_NO_WRITE_PERMISSION;

        return *this;

    }

    // Need to build the pattern in a temporary string because

    // _applyPattern calls add() etc., which set pat to empty.

    UnicodeString rebuiltPat;

    RuleCharacterIterator chars(pattern, symbols, pos);

    applyPattern(chars, symbols, rebuiltPat, options, &UnicodeSet::closeOver, 0, status);

    if (U_FAILURE(status)) return *this;

    if (chars.inVariable()) {

        // syntaxError(chars, "Extra chars in variable value");

        status = U_MALFORMED_SET;

        return *this;

    }

    setPattern(rebuiltPat);

    return *this;

}

// USetAdder implementation

// Does not use uset.h to reduce code dependencies

static void U_CALLCONV

_set_add(USet *set, UChar32 c) {

    ((UnicodeSet *)set)->add(c);

}

static void U_CALLCONV

_set_addRange(USet *set, UChar32 start, UChar32 end) {

    ((UnicodeSet *)set)->add(start, end);

}

static void U_CALLCONV

_set_addString(USet *set, const UChar *str, int32_t length) {

    ((UnicodeSet *)set)->add(UnicodeString((UBool)(length<0), str, length));

}

//----------------------------------------------------------------

// Case folding API

//----------------------------------------------------------------

// add the result of a full case mapping to the set

// use str as a temporary string to avoid constructing one

static inline void

addCaseMapping(UnicodeSet &set, int32_t result, const UChar *full, UnicodeString &str) {

    if(result >= 0) {

        if(result > UCASE_MAX_STRING_LENGTH) {

            // add a single-code point case mapping

            set.add(result);

        } else {

            // add a string case mapping from full with length result

            str.setTo((UBool)FALSE, full, result);

            set.add(str);

        }

    }

    // result < 0: the code point mapped to itself, no need to add it

    // see ucase.h

}

UnicodeSet& UnicodeSet::closeOver(int32_t attribute) {

    if (isFrozen() || isBogus()) {

        return *this;

    }

    if (attribute & (USET_CASE_INSENSITIVE | USET_ADD_CASE_MAPPINGS)) {

        {

            UnicodeSet foldSet(*this);

            UnicodeString str;

            USetAdder sa = {

                foldSet.toUSet(),

                _set_add,

                _set_addRange,

                _set_addString,

                NULL, // don't need remove()

                NULL // don't need removeRange()

            };

            // start with input set to guarantee inclusion

            // USET_CASE: remove strings because the strings will actually be reduced (folded);

            //            therefore, start with no strings and add only those needed

            if ((attribute & USET_CASE_INSENSITIVE) && foldSet.hasStrings()) {

                foldSet.strings->removeAllElements();

            }

            int32_t n = getRangeCount();

            UChar32 result;

            const UChar *full;

            for (int32_t i=0; i<n; ++i) {

                UChar32 start = getRangeStart(i);

                UChar32 end   = getRangeEnd(i);

                if (attribute & USET_CASE_INSENSITIVE) {

                    // full case closure

                    for (UChar32 cp=start; cp<=end; ++cp) {

                        ucase_addCaseClosure(cp, &sa);

                    }

                } else {

                    // add case mappings

                    // (does not add long s for regular s, or Kelvin for k, for example)

                    for (UChar32 cp=start; cp<=end; ++cp) {

                        result = ucase_toFullLower(cp, NULL, NULL, &full, UCASE_LOC_ROOT);

                        addCaseMapping(foldSet, result, full, str);

                        result = ucase_toFullTitle(cp, NULL, NULL, &full, UCASE_LOC_ROOT);

                        addCaseMapping(foldSet, result, full, str);

                        result = ucase_toFullUpper(cp, NULL, NULL, &full, UCASE_LOC_ROOT);

                        addCaseMapping(foldSet, result, full, str);

                        result = ucase_toFullFolding(cp, &full, 0);

                        addCaseMapping(foldSet, result, full, str);

                    }

                }

            }

            if (hasStrings()) {

                if (attribute & USET_CASE_INSENSITIVE) {

                    for (int32_t j=0; j<strings->size(); ++j) {

                        str = *(const UnicodeString *) strings->elementAt(j);

                        str.foldCase();

                        if(!ucase_addStringCaseClosure(str.getBuffer(), str.length(), &sa)) {

                            foldSet.add(str); // does not map to code points: add the folded string itself

                        }

                    }

                } else {

                    Locale root("");

#if !UCONFIG_NO_BREAK_ITERATION

                    UErrorCode status = U_ZERO_ERROR;

                    BreakIterator *bi = BreakIterator::createWordInstance(root, status);

                    if (U_SUCCESS(status)) {

#endif

                        const UnicodeString *pStr;

                        for (int32_t j=0; j<strings->size(); ++j) {

                            pStr = (const UnicodeString *) strings->elementAt(j);

                            (str = *pStr).toLower(root);

                            foldSet.add(str);

#if !UCONFIG_NO_BREAK_ITERATION

                            (str = *pStr).toTitle(bi, root);

                            foldSet.add(str);

#endif

                            (str = *pStr).toUpper(root);

                            foldSet.add(str);

                            (str = *pStr).foldCase();

                            foldSet.add(str);

                        }

#if !UCONFIG_NO_BREAK_ITERATION

                    }

                    delete bi;

#endif

                }

            }

            *this = foldSet;

        }

    }

    return *this;

}

U_NAMESPACE_END