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// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
// This file contains one implementation of FormattedValue.
// Other independent implementations should go into their own cpp file for
// better dependency modularization.
#include "formattedval_impl.h"
#include "putilimp.h"
U_NAMESPACE_BEGIN
FormattedValueFieldPositionIteratorImpl::FormattedValueFieldPositionIteratorImpl(
int32_t initialFieldCapacity,
UErrorCode& status)
: fFields(initialFieldCapacity * 4, status) {
}
FormattedValueFieldPositionIteratorImpl::~FormattedValueFieldPositionIteratorImpl() = default;
UnicodeString FormattedValueFieldPositionIteratorImpl::toString(
UErrorCode&) const {
return fString;
}
UnicodeString FormattedValueFieldPositionIteratorImpl::toTempString(
UErrorCode&) const {
// The alias must point to memory owned by this object;
// fastCopyFrom doesn't do this when using a stack buffer.
return UnicodeString(true, fString.getBuffer(), fString.length());
}
Appendable& FormattedValueFieldPositionIteratorImpl::appendTo(
Appendable& appendable,
UErrorCode&) const {
appendable.appendString(fString.getBuffer(), fString.length());
return appendable;
}
UBool FormattedValueFieldPositionIteratorImpl::nextPosition(
ConstrainedFieldPosition& cfpos,
UErrorCode&) const {
U_ASSERT(fFields.size() % 4 == 0);
int32_t numFields = fFields.size() / 4;
int32_t i = static_cast<int32_t>(cfpos.getInt64IterationContext());
for (; i < numFields; i++) {
UFieldCategory category = static_cast<UFieldCategory>(fFields.elementAti(i * 4));
int32_t field = fFields.elementAti(i * 4 + 1);
if (cfpos.matchesField(category, field)) {
int32_t start = fFields.elementAti(i * 4 + 2);
int32_t limit = fFields.elementAti(i * 4 + 3);
cfpos.setState(category, field, start, limit);
break;
}
}
cfpos.setInt64IterationContext(i == numFields ? i : i + 1);
return i < numFields;
}
FieldPositionIteratorHandler FormattedValueFieldPositionIteratorImpl::getHandler(
UErrorCode& status) {
return FieldPositionIteratorHandler(&fFields, status);
}
void FormattedValueFieldPositionIteratorImpl::appendString(
UnicodeString string,
UErrorCode& status) {
if (U_FAILURE(status)) {
return;
}
fString.append(string);
// Make the string NUL-terminated
if (fString.getTerminatedBuffer() == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
}
void FormattedValueFieldPositionIteratorImpl::addOverlapSpans(
UFieldCategory spanCategory,
int8_t firstIndex,
UErrorCode& status) {
// In order to avoid fancy data structures, this is an O(N^2) algorithm,
// which should be fine for all real-life applications of this function.
int32_t s1a = INT32_MAX;
int32_t s1b = 0;
int32_t s2a = INT32_MAX;
int32_t s2b = 0;
int32_t numFields = fFields.size() / 4;
for (int32_t i = 0; i<numFields; i++) {
int32_t field1 = fFields.elementAti(i * 4 + 1);
for (int32_t j = i + 1; j<numFields; j++) {
int32_t field2 = fFields.elementAti(j * 4 + 1);
if (field1 != field2) {
continue;
}
// Found a duplicate
s1a = uprv_min(s1a, fFields.elementAti(i * 4 + 2));
s1b = uprv_max(s1b, fFields.elementAti(i * 4 + 3));
s2a = uprv_min(s2a, fFields.elementAti(j * 4 + 2));
s2b = uprv_max(s2b, fFields.elementAti(j * 4 + 3));
break;
}
}
if (s1a != INT32_MAX) {
// Success: add the two span fields
fFields.addElement(spanCategory, status);
fFields.addElement(firstIndex, status);
fFields.addElement(s1a, status);
fFields.addElement(s1b, status);
fFields.addElement(spanCategory, status);
fFields.addElement(1 - firstIndex, status);
fFields.addElement(s2a, status);
fFields.addElement(s2b, status);
}
}
void FormattedValueFieldPositionIteratorImpl::sort() {
// Use bubble sort, O(N^2) but easy and no fancy data structures.
int32_t numFields = fFields.size() / 4;
while (true) {
bool isSorted = true;
for (int32_t i=0; i<numFields-1; i++) {
int32_t categ1 = fFields.elementAti(i*4 + 0);
int32_t field1 = fFields.elementAti(i*4 + 1);
int32_t start1 = fFields.elementAti(i*4 + 2);
int32_t limit1 = fFields.elementAti(i*4 + 3);
int32_t categ2 = fFields.elementAti(i*4 + 4);
int32_t field2 = fFields.elementAti(i*4 + 5);
int32_t start2 = fFields.elementAti(i*4 + 6);
int32_t limit2 = fFields.elementAti(i*4 + 7);
int64_t comparison = 0;
if (start1 != start2) {
// Higher start index -> higher rank
comparison = start2 - start1;
} else if (limit1 != limit2) {
// Higher length (end index) -> lower rank
comparison = limit1 - limit2;
} else if (categ1 != categ2) {
// Higher field category -> lower rank
comparison = categ1 - categ2;
} else if (field1 != field2) {
// Higher field -> higher rank
comparison = field2 - field1;
}
if (comparison < 0) {
// Perform a swap
isSorted = false;
fFields.setElementAt(categ2, i*4 + 0);
fFields.setElementAt(field2, i*4 + 1);
fFields.setElementAt(start2, i*4 + 2);
fFields.setElementAt(limit2, i*4 + 3);
fFields.setElementAt(categ1, i*4 + 4);
fFields.setElementAt(field1, i*4 + 5);
fFields.setElementAt(start1, i*4 + 6);
fFields.setElementAt(limit1, i*4 + 7);
}
}
if (isSorted) {
break;
}
}
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
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