314 lines
8.4 KiB
C++
314 lines
8.4 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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*
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* scriptset.cpp
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*
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* created on: 2013 Jan 7
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* created by: Andy Heninger
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*/
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#include "unicode/utypes.h"
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#include "unicode/uchar.h"
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#include "unicode/unistr.h"
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#include "scriptset.h"
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#include "uassert.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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//----------------------------------------------------------------------------
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//
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// ScriptSet implementation
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//
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//----------------------------------------------------------------------------
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ScriptSet::ScriptSet() {
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uprv_memset(bits, 0, sizeof(bits));
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}
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ScriptSet::~ScriptSet() {
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}
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ScriptSet::ScriptSet(const ScriptSet &other) {
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*this = other;
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}
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ScriptSet & ScriptSet::operator =(const ScriptSet &other) {
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uprv_memcpy(bits, other.bits, sizeof(bits));
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return *this;
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}
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bool ScriptSet::operator == (const ScriptSet &other) const {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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if (bits[i] != other.bits[i]) {
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return false;
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}
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}
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return true;
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}
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UBool ScriptSet::test(UScriptCode script, UErrorCode &status) const {
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if (U_FAILURE(status)) {
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return false;
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}
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if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return false;
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}
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uint32_t index = script / 32;
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uint32_t bit = 1 << (script & 31);
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return ((bits[index] & bit) != 0);
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}
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ScriptSet &ScriptSet::set(UScriptCode script, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *this;
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}
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if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return *this;
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}
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uint32_t index = script / 32;
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uint32_t bit = 1 << (script & 31);
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bits[index] |= bit;
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return *this;
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}
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ScriptSet &ScriptSet::reset(UScriptCode script, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *this;
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}
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if (script < 0 || (int32_t)script >= SCRIPT_LIMIT) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return *this;
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}
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uint32_t index = script / 32;
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uint32_t bit = 1 << (script & 31);
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bits[index] &= ~bit;
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return *this;
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}
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ScriptSet &ScriptSet::Union(const ScriptSet &other) {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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bits[i] |= other.bits[i];
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}
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return *this;
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}
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ScriptSet &ScriptSet::intersect(const ScriptSet &other) {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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bits[i] &= other.bits[i];
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}
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return *this;
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}
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ScriptSet &ScriptSet::intersect(UScriptCode script, UErrorCode &status) {
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ScriptSet t;
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t.set(script, status);
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if (U_SUCCESS(status)) {
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this->intersect(t);
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}
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return *this;
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}
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UBool ScriptSet::intersects(const ScriptSet &other) const {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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if ((bits[i] & other.bits[i]) != 0) {
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return true;
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}
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}
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return false;
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}
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UBool ScriptSet::contains(const ScriptSet &other) const {
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ScriptSet t(*this);
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t.intersect(other);
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return (t == other);
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}
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ScriptSet &ScriptSet::setAll() {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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bits[i] = 0xffffffffu;
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}
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return *this;
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}
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ScriptSet &ScriptSet::resetAll() {
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uprv_memset(bits, 0, sizeof(bits));
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return *this;
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}
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int32_t ScriptSet::countMembers() const {
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// This bit counter is good for sparse numbers of '1's, which is
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// very much the case that we will usually have.
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int32_t count = 0;
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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uint32_t x = bits[i];
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while (x > 0) {
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count++;
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x &= (x - 1); // and off the least significant one bit.
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}
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}
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return count;
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}
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int32_t ScriptSet::hashCode() const {
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int32_t hash = 0;
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for (int32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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hash ^= bits[i];
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}
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return hash;
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}
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int32_t ScriptSet::nextSetBit(int32_t fromIndex) const {
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// TODO: Wants a better implementation.
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if (fromIndex < 0) {
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return -1;
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}
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UErrorCode status = U_ZERO_ERROR;
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for (int32_t scriptIndex = fromIndex; scriptIndex < SCRIPT_LIMIT; scriptIndex++) {
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if (test((UScriptCode)scriptIndex, status)) {
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return scriptIndex;
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}
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}
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return -1;
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}
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UBool ScriptSet::isEmpty() const {
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for (uint32_t i=0; i<UPRV_LENGTHOF(bits); i++) {
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if (bits[i] != 0) {
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return false;
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}
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}
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return true;
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}
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UnicodeString &ScriptSet::displayScripts(UnicodeString &dest) const {
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UBool firstTime = true;
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for (int32_t i = nextSetBit(0); i >= 0; i = nextSetBit(i + 1)) {
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if (!firstTime) {
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dest.append((UChar)0x20);
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}
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firstTime = false;
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const char *scriptName = uscript_getShortName((UScriptCode(i)));
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dest.append(UnicodeString(scriptName, -1, US_INV));
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}
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return dest;
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}
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ScriptSet &ScriptSet::parseScripts(const UnicodeString &scriptString, UErrorCode &status) {
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resetAll();
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if (U_FAILURE(status)) {
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return *this;
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}
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UnicodeString oneScriptName;
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for (int32_t i=0; i<scriptString.length();) {
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UChar32 c = scriptString.char32At(i);
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i = scriptString.moveIndex32(i, 1);
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if (!u_isUWhiteSpace(c)) {
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oneScriptName.append(c);
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if (i < scriptString.length()) {
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continue;
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}
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}
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if (oneScriptName.length() > 0) {
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char buf[40];
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oneScriptName.extract(0, oneScriptName.length(), buf, sizeof(buf)-1, US_INV);
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buf[sizeof(buf)-1] = 0;
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int32_t sc = u_getPropertyValueEnum(UCHAR_SCRIPT, buf);
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if (sc == UCHAR_INVALID_CODE) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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} else {
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this->set((UScriptCode)sc, status);
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}
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if (U_FAILURE(status)) {
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return *this;
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}
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oneScriptName.remove();
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}
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}
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return *this;
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}
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void ScriptSet::setScriptExtensions(UChar32 codePoint, UErrorCode& status) {
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if (U_FAILURE(status)) { return; }
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static const int32_t FIRST_GUESS_SCRIPT_CAPACITY = 20;
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MaybeStackArray<UScriptCode,FIRST_GUESS_SCRIPT_CAPACITY> scripts;
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UErrorCode internalStatus = U_ZERO_ERROR;
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int32_t script_count = -1;
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while (true) {
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script_count = uscript_getScriptExtensions(
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codePoint, scripts.getAlias(), scripts.getCapacity(), &internalStatus);
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if (internalStatus == U_BUFFER_OVERFLOW_ERROR) {
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// Need to allocate more space
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if (scripts.resize(script_count) == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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internalStatus = U_ZERO_ERROR;
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} else {
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break;
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}
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}
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// Check if we failed for some reason other than buffer overflow
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if (U_FAILURE(internalStatus)) {
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status = internalStatus;
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return;
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}
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// Load the scripts into the ScriptSet and return
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for (int32_t i = 0; i < script_count; i++) {
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this->set(scripts[i], status);
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if (U_FAILURE(status)) { return; }
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}
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}
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U_NAMESPACE_END
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U_CAPI UBool U_EXPORT2
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uhash_equalsScriptSet(const UElement key1, const UElement key2) {
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icu::ScriptSet *s1 = static_cast<icu::ScriptSet *>(key1.pointer);
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icu::ScriptSet *s2 = static_cast<icu::ScriptSet *>(key2.pointer);
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return (*s1 == *s2);
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}
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U_CAPI int8_t U_EXPORT2
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uhash_compareScriptSet(UElement key0, UElement key1) {
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icu::ScriptSet *s0 = static_cast<icu::ScriptSet *>(key0.pointer);
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icu::ScriptSet *s1 = static_cast<icu::ScriptSet *>(key1.pointer);
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int32_t diff = s0->countMembers() - s1->countMembers();
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if (diff != 0) return static_cast<UBool>(diff);
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int32_t i0 = s0->nextSetBit(0);
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int32_t i1 = s1->nextSetBit(0);
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while ((diff = i0-i1) == 0 && i0 > 0) {
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i0 = s0->nextSetBit(i0+1);
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i1 = s1->nextSetBit(i1+1);
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}
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return (int8_t)diff;
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}
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U_CAPI int32_t U_EXPORT2
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uhash_hashScriptSet(const UElement key) {
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icu::ScriptSet *s = static_cast<icu::ScriptSet *>(key.pointer);
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return s->hashCode();
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}
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U_CAPI void U_EXPORT2
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uhash_deleteScriptSet(void *obj) {
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icu::ScriptSet *s = static_cast<icu::ScriptSet *>(obj);
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delete s;
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}
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