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146 lines
3.7 KiB
146 lines
3.7 KiB
// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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// Allow implicit conversion from char16_t* to UnicodeString for this file:
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// Helpful in toString methods and elsewhere.
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#define UNISTR_FROM_STRING_EXPLICIT
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#include "numparse_types.h"
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#include "string_segment.h"
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#include "putilimp.h"
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#include "unicode/utf16.h"
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#include "unicode/uniset.h"
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U_NAMESPACE_BEGIN
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StringSegment::StringSegment(const UnicodeString& str, bool ignoreCase)
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: fStr(str), fStart(0), fEnd(str.length()),
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fFoldCase(ignoreCase) {}
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int32_t StringSegment::getOffset() const {
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return fStart;
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}
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void StringSegment::setOffset(int32_t start) {
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fStart = start;
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}
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void StringSegment::adjustOffset(int32_t delta) {
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fStart += delta;
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}
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void StringSegment::adjustOffsetByCodePoint() {
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fStart += U16_LENGTH(getCodePoint());
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}
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void StringSegment::setLength(int32_t length) {
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fEnd = fStart + length;
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}
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void StringSegment::resetLength() {
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fEnd = fStr.length();
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}
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int32_t StringSegment::length() const {
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return fEnd - fStart;
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}
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char16_t StringSegment::charAt(int32_t index) const {
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return fStr.charAt(index + fStart);
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}
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UChar32 StringSegment::codePointAt(int32_t index) const {
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return fStr.char32At(index + fStart);
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}
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UnicodeString StringSegment::toUnicodeString() const {
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return UnicodeString(fStr.getBuffer() + fStart, fEnd - fStart);
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}
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const UnicodeString StringSegment::toTempUnicodeString() const {
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// Use the readonly-aliasing constructor for efficiency.
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return UnicodeString(FALSE, fStr.getBuffer() + fStart, fEnd - fStart);
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}
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UChar32 StringSegment::getCodePoint() const {
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char16_t lead = fStr.charAt(fStart);
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if (U16_IS_LEAD(lead) && fStart + 1 < fEnd) {
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return fStr.char32At(fStart);
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} else if (U16_IS_SURROGATE(lead)) {
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return -1;
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} else {
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return lead;
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}
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}
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bool StringSegment::startsWith(UChar32 otherCp) const {
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return codePointsEqual(getCodePoint(), otherCp, fFoldCase);
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}
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bool StringSegment::startsWith(const UnicodeSet& uniset) const {
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// TODO: Move UnicodeSet case-folding logic here.
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// TODO: Handle string matches here instead of separately.
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UChar32 cp = getCodePoint();
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if (cp == -1) {
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return false;
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}
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return uniset.contains(cp);
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}
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bool StringSegment::startsWith(const UnicodeString& other) const {
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if (other.isBogus() || other.length() == 0 || length() == 0) {
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return false;
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}
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int cp1 = getCodePoint();
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int cp2 = other.char32At(0);
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return codePointsEqual(cp1, cp2, fFoldCase);
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}
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int32_t StringSegment::getCommonPrefixLength(const UnicodeString& other) {
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return getPrefixLengthInternal(other, fFoldCase);
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}
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int32_t StringSegment::getCaseSensitivePrefixLength(const UnicodeString& other) {
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return getPrefixLengthInternal(other, false);
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}
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int32_t StringSegment::getPrefixLengthInternal(const UnicodeString& other, bool foldCase) {
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U_ASSERT(other.length() > 0);
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int32_t offset = 0;
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for (; offset < uprv_min(length(), other.length());) {
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// TODO: case-fold code points, not chars
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char16_t c1 = charAt(offset);
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char16_t c2 = other.charAt(offset);
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if (!codePointsEqual(c1, c2, foldCase)) {
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break;
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}
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offset++;
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}
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return offset;
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}
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bool StringSegment::codePointsEqual(UChar32 cp1, UChar32 cp2, bool foldCase) {
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if (cp1 == cp2) {
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return true;
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}
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if (!foldCase) {
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return false;
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}
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cp1 = u_foldCase(cp1, TRUE);
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cp2 = u_foldCase(cp2, TRUE);
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return cp1 == cp2;
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}
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bool StringSegment::operator==(const UnicodeString& other) const {
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return toTempUnicodeString() == other;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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