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// © 2016 and later: Unicode, Inc. and others.
/*
*******************************************************************************
*
* 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 "unicode/utf16.h"
#include "cmemory.h"
#include "ruleiter.h"
#include "ucase.h"
#include "uprops.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 char16_t *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 char16_t *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
}
namespace {
/** For case closure on a large set, look only at code points with relevant properties. */
const UnicodeSet &maybeOnlyCaseSensitive(const UnicodeSet &src, UnicodeSet &subset) {
// The subset must have been constructed with all code points,
// so that the retainAll() intersection effectively copies all single code points from src.
U_ASSERT(subset.contains(0, 0x10ffff));
if (src.size() < 30) {
return src;
}
// Return the intersection of the src code points with Case_Sensitive ones.
UErrorCode errorCode = U_ZERO_ERROR;
const UnicodeSet *sensitive =
CharacterProperties::getBinaryPropertySet(UCHAR_CASE_SENSITIVE, errorCode);
if (U_FAILURE(errorCode)) {
return src;
}
// Start by copying the "smaller" set.
// (We "copy" by intersecting all Unicode *code points* with the first set,
// which omits any strings.)
if (src.getRangeCount() > sensitive->getRangeCount()) {
subset.retainAll(*sensitive);
subset.retainAll(src);
} else {
subset.retainAll(src);
subset.retainAll(*sensitive);
}
return subset;
}
// Per-character scf = Simple_Case_Folding of a string.
// (Normally when we case-fold a string we use full case foldings.)
bool scfString(const UnicodeString &s, UnicodeString &scf) {
// Iterate over the raw buffer for best performance.
const char16_t *p = s.getBuffer();
int32_t length = s.length();
// Loop while not needing modification.
for (int32_t i = 0; i < length;) {
UChar32 c;
U16_NEXT(p, i, length, c); // post-increments i
UChar32 scfChar = u_foldCase(c, U_FOLD_CASE_DEFAULT);
if (scfChar != c) {
// Copy the characters before c.
scf.setTo(p, i - U16_LENGTH(c));
// Loop over the rest of the string and keep case-folding.
for (;;) {
scf.append(scfChar);
if (i == length) {
return true;
}
U16_NEXT(p, i, length, c); // post-increments i
scfChar = u_foldCase(c, U_FOLD_CASE_DEFAULT);
}
}
}
return false;
}
} // namespace
UnicodeSet& UnicodeSet::closeOver(int32_t attribute) {
if (isFrozen() || isBogus()) {
return *this;
}
switch (attribute & USET_CASE_MASK) {
case 0:
break;
case USET_CASE_INSENSITIVE:
closeOverCaseInsensitive(/* simple= */ false);
break;
case USET_ADD_CASE_MAPPINGS:
closeOverAddCaseMappings();
break;
case USET_SIMPLE_CASE_INSENSITIVE:
closeOverCaseInsensitive(/* simple= */ true);
break;
default:
// bad option (unreachable)
break;
}
return *this;
}
void UnicodeSet::closeOverCaseInsensitive(bool simple) {
// Start with input set to guarantee inclusion.
UnicodeSet foldSet(*this);
// Full case mappings closure:
// Remove strings because the strings will actually be reduced (folded);
// therefore, start with no strings and add only those needed.
// Do this before processing code points, because they may add strings.
if (!simple && foldSet.hasStrings()) {
foldSet.strings->removeAllElements();
}
USetAdder sa = {
foldSet.toUSet(),
_set_add,
_set_addRange,
_set_addString,
nullptr, // don't need remove()
nullptr // don't need removeRange()
};
UnicodeSet subset(0, 0x10ffff);
const UnicodeSet &codePoints = maybeOnlyCaseSensitive(*this, subset);
// Iterate over the ranges of single code points. Nested loop for each code point.
int32_t n = codePoints.getRangeCount();
for (int32_t i=0; i<n; ++i) {
UChar32 start = codePoints.getRangeStart(i);
UChar32 end = codePoints.getRangeEnd(i);
if (simple) {
for (UChar32 cp=start; cp<=end; ++cp) {
ucase_addSimpleCaseClosure(cp, &sa);
}
} else {
for (UChar32 cp=start; cp<=end; ++cp) {
ucase_addCaseClosure(cp, &sa);
}
}
}
if (hasStrings()) {
UnicodeString str;
for (int32_t j=0; j<strings->size(); ++j) {
const UnicodeString *pStr = (const UnicodeString *) strings->elementAt(j);
if (simple) {
if (scfString(*pStr, str)) {
foldSet.remove(*pStr).add(str);
}
} else {
str = *pStr;
str.foldCase();
if(!ucase_addStringCaseClosure(str.getBuffer(), str.length(), &sa)) {
foldSet.add(str); // does not map to code points: add the folded string itself
}
}
}
}
*this = foldSet;
}
void UnicodeSet::closeOverAddCaseMappings() {
// Start with input set to guarantee inclusion.
UnicodeSet foldSet(*this);
UnicodeSet subset(0, 0x10ffff);
const UnicodeSet &codePoints = maybeOnlyCaseSensitive(*this, subset);
// Iterate over the ranges of single code points. Nested loop for each code point.
int32_t n = codePoints.getRangeCount();
UChar32 result;
const char16_t *full;
UnicodeString str;
for (int32_t i=0; i<n; ++i) {
UChar32 start = codePoints.getRangeStart(i);
UChar32 end = codePoints.getRangeEnd(i);
// 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, nullptr, nullptr, &full, UCASE_LOC_ROOT);
addCaseMapping(foldSet, result, full, str);
result = ucase_toFullTitle(cp, nullptr, nullptr, &full, UCASE_LOC_ROOT);
addCaseMapping(foldSet, result, full, str);
result = ucase_toFullUpper(cp, nullptr, nullptr, &full, UCASE_LOC_ROOT);
addCaseMapping(foldSet, result, full, str);
result = ucase_toFullFolding(cp, &full, 0);
addCaseMapping(foldSet, result, full, str);
}
}
if (hasStrings()) {
Locale root("");
#if !UCONFIG_NO_BREAK_ITERATION
UErrorCode status = U_ZERO_ERROR;
BreakIterator *bi = BreakIterator::createWordInstance(root, status);
if (U_SUCCESS(status)) {
#endif
for (int32_t j=0; j<strings->size(); ++j) {
const UnicodeString *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;
}
U_NAMESPACE_END