430 lines
11 KiB
C++
430 lines
11 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 2002, 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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* file name: uiter.cpp
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002jan18
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* created by: Markus W. Scherer
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*/
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#include "unicode/utypes.h"
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#include "unicode/ustring.h"
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#include "unicode/chariter.h"
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#include "unicode/rep.h"
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#include "unicode/uiter.h"
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U_CDECL_BEGIN
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/* No-Op UCharIterator implementation for illegal input --------------------- */
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static int32_t U_CALLCONV
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noopGetIndex(UCharIterator * /*iter*/, UCharIteratorOrigin /*origin*/) {
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return 0;
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}
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static int32_t U_CALLCONV
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noopMove(UCharIterator * /*iter*/, int32_t /*delta*/, UCharIteratorOrigin /*origin*/) {
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return 0;
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}
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static UBool U_CALLCONV
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noopHasNext(UCharIterator * /*iter*/) {
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return FALSE;
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}
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static int32_t U_CALLCONV
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noopCurrent(UCharIterator * /*iter*/) {
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return -1;
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}
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static const UCharIterator noopIterator={
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0, 0, 0, 0, 0, 0,
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noopGetIndex,
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noopMove,
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noopHasNext,
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noopHasNext,
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noopCurrent,
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noopCurrent,
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noopCurrent,
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0
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};
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/* UCharIterator implementation for simple strings -------------------------- */
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/*
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* This is an implementation of a code unit (UChar) iterator
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* for UChar * strings.
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*
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* The UCharIterator.context field holds a pointer to the string.
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*/
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static int32_t U_CALLCONV
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stringIteratorGetIndex(UCharIterator *iter, UCharIteratorOrigin origin) {
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switch(origin) {
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case UITER_ZERO:
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return 0;
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case UITER_START:
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return iter->start;
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case UITER_CURRENT:
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return iter->index;
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case UITER_LIMIT:
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return iter->limit;
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case UITER_LENGTH:
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return iter->length;
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default:
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/* not a valid origin */
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/* Should never get here! */
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return -1;
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}
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}
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static int32_t U_CALLCONV
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stringIteratorMove(UCharIterator *iter, int32_t delta, UCharIteratorOrigin origin) {
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int32_t pos;
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switch(origin) {
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case UITER_ZERO:
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pos=delta;
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break;
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case UITER_START:
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pos=iter->start+delta;
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break;
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case UITER_CURRENT:
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pos=iter->index+delta;
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break;
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case UITER_LIMIT:
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pos=iter->limit+delta;
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break;
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case UITER_LENGTH:
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pos=iter->length+delta;
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break;
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default:
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return -1; /* Error */
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}
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if(pos<iter->start) {
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pos=iter->start;
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} else if(pos>iter->limit) {
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pos=iter->limit;
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}
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return iter->index=pos;
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}
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static UBool U_CALLCONV
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stringIteratorHasNext(UCharIterator *iter) {
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return iter->index<iter->limit;
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}
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static UBool U_CALLCONV
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stringIteratorHasPrevious(UCharIterator *iter) {
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return iter->index>iter->start;
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}
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static int32_t U_CALLCONV
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stringIteratorCurrent(UCharIterator *iter) {
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if(iter->index<iter->limit) {
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return ((const UChar *)(iter->context))[iter->index];
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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stringIteratorNext(UCharIterator *iter) {
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if(iter->index<iter->limit) {
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return ((const UChar *)(iter->context))[iter->index++];
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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stringIteratorPrevious(UCharIterator *iter) {
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if(iter->index>iter->start) {
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return ((const UChar *)(iter->context))[--iter->index];
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} else {
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return -1;
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}
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}
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static const UCharIterator stringIterator={
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0, 0, 0, 0, 0, 0,
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stringIteratorGetIndex,
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stringIteratorMove,
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stringIteratorHasNext,
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stringIteratorHasPrevious,
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stringIteratorCurrent,
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stringIteratorNext,
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stringIteratorPrevious,
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0
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};
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U_CAPI void U_EXPORT2
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uiter_setString(UCharIterator *iter, const UChar *s, int32_t length) {
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if(iter!=0) {
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if(s!=0 && length>=-1) {
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*iter=stringIterator;
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iter->context=s;
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if(length>=0) {
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iter->length=length;
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} else {
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iter->length=u_strlen(s);
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}
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iter->limit=iter->length;
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} else {
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*iter=noopIterator;
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}
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}
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}
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/* UCharIterator wrapper around CharacterIterator --------------------------- */
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/*
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* This is wrapper code around a C++ CharacterIterator to
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* look like a C UCharIterator.
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*
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* The UCharIterator.context field holds a pointer to the CharacterIterator.
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*/
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static int32_t U_CALLCONV
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characterIteratorGetIndex(UCharIterator *iter, UCharIteratorOrigin origin) {
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switch(origin) {
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case UITER_ZERO:
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return 0;
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case UITER_START:
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return ((CharacterIterator *)(iter->context))->startIndex();
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case UITER_CURRENT:
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return ((CharacterIterator *)(iter->context))->getIndex();
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case UITER_LIMIT:
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return ((CharacterIterator *)(iter->context))->endIndex();
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case UITER_LENGTH:
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return ((CharacterIterator *)(iter->context))->getLength();
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default:
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/* not a valid origin */
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/* Should never get here! */
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return -1;
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}
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}
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static int32_t U_CALLCONV
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characterIteratorMove(UCharIterator *iter, int32_t delta, UCharIteratorOrigin origin) {
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switch(origin) {
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case UITER_ZERO:
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((CharacterIterator *)(iter->context))->setIndex(delta);
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return ((CharacterIterator *)(iter->context))->getIndex();
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case UITER_START:
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case UITER_CURRENT:
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case UITER_LIMIT:
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return ((CharacterIterator *)(iter->context))->move(delta, (CharacterIterator::EOrigin)origin);
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case UITER_LENGTH:
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((CharacterIterator *)(iter->context))->setIndex(((CharacterIterator *)(iter->context))->getLength()+delta);
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return ((CharacterIterator *)(iter->context))->getIndex();
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default:
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/* not a valid origin */
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/* Should never get here! */
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return -1;
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}
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}
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static UBool U_CALLCONV
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characterIteratorHasNext(UCharIterator *iter) {
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return ((CharacterIterator *)(iter->context))->hasNext();
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}
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static UBool U_CALLCONV
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characterIteratorHasPrevious(UCharIterator *iter) {
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return ((CharacterIterator *)(iter->context))->hasPrevious();
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}
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static int32_t U_CALLCONV
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characterIteratorCurrent(UCharIterator *iter) {
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int32_t c;
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c=((CharacterIterator *)(iter->context))->current();
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if(c!=0xffff || ((CharacterIterator *)(iter->context))->hasNext()) {
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return c;
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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characterIteratorNext(UCharIterator *iter) {
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if(((CharacterIterator *)(iter->context))->hasNext()) {
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return ((CharacterIterator *)(iter->context))->nextPostInc();
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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characterIteratorPrevious(UCharIterator *iter) {
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if(((CharacterIterator *)(iter->context))->hasPrevious()) {
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return ((CharacterIterator *)(iter->context))->previous();
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} else {
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return -1;
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}
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}
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static const UCharIterator characterIteratorWrapper={
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0, 0, 0, 0, 0, 0,
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characterIteratorGetIndex,
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characterIteratorMove,
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characterIteratorHasNext,
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characterIteratorHasPrevious,
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characterIteratorCurrent,
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characterIteratorNext,
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characterIteratorPrevious,
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0
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};
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U_CAPI void U_EXPORT2
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uiter_setCharacterIterator(UCharIterator *iter, CharacterIterator *charIter) {
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if(iter!=0) {
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if(charIter!=0) {
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*iter=characterIteratorWrapper;
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iter->context=charIter;
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} else {
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*iter=noopIterator;
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}
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}
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}
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/* UCharIterator wrapper around Replaceable --------------------------------- */
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/*
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* This is an implementation of a code unit (UChar) iterator
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* based on a Replaceable object.
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*
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* The UCharIterator.context field holds a pointer to the Replaceable.
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* UCharIterator.length and UCharIterator.index hold Replaceable.length()
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* and the iteration index.
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*/
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static int32_t U_CALLCONV
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replaceableIteratorCurrent(UCharIterator *iter) {
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if(iter->index<iter->limit) {
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return ((Replaceable *)(iter->context))->charAt(iter->index);
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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replaceableIteratorNext(UCharIterator *iter) {
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if(iter->index<iter->limit) {
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return ((Replaceable *)(iter->context))->charAt(iter->index++);
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} else {
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return -1;
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}
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}
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static int32_t U_CALLCONV
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replaceableIteratorPrevious(UCharIterator *iter) {
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if(iter->index>iter->start) {
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return ((Replaceable *)(iter->context))->charAt(--iter->index);
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} else {
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return -1;
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}
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}
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static const UCharIterator replaceableIterator={
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0, 0, 0, 0, 0, 0,
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stringIteratorGetIndex,
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stringIteratorMove,
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stringIteratorHasNext,
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stringIteratorHasPrevious,
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replaceableIteratorCurrent,
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replaceableIteratorNext,
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replaceableIteratorPrevious,
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0
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};
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U_CAPI void U_EXPORT2
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uiter_setReplaceable(UCharIterator *iter, const Replaceable *rep) {
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if(iter!=0) {
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if(rep!=0) {
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*iter=replaceableIterator;
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iter->context=rep;
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iter->limit=iter->length=rep->length();
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} else {
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*iter=noopIterator;
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}
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}
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}
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/* Helper functions --------------------------------------------------------- */
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U_CAPI int32_t U_EXPORT2
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uiter_current32(UCharIterator *iter) {
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int32_t c, c2;
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c=iter->current(iter);
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if(UTF_IS_SURROGATE(c)) {
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if(UTF_IS_SURROGATE_FIRST(c)) {
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/*
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* go to the next code unit
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* we know that we are not at the limit because c!=-1
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*/
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iter->move(iter, 1, UITER_CURRENT);
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if(UTF_IS_SECOND_SURROGATE(c2=iter->current(iter))) {
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c=UTF16_GET_PAIR_VALUE(c, c2);
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}
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/* undo index movement */
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iter->move(iter, -1, UITER_CURRENT);
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} else {
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if(UTF_IS_FIRST_SURROGATE(c2=iter->previous(iter))) {
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c=UTF16_GET_PAIR_VALUE(c2, c);
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}
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if(c2>=0) {
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/* undo index movement */
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iter->move(iter, 1, UITER_CURRENT);
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}
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}
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}
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return c;
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}
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U_CAPI int32_t U_EXPORT2
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uiter_next32(UCharIterator *iter) {
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int32_t c, c2;
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c=iter->next(iter);
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if(UTF_IS_FIRST_SURROGATE(c)) {
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if(UTF_IS_SECOND_SURROGATE(c2=iter->next(iter))) {
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c=UTF16_GET_PAIR_VALUE(c, c2);
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} else if(c2>=0) {
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/* unmatched first surrogate, undo index movement */
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iter->move(iter, -1, UITER_CURRENT);
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}
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}
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return c;
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}
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U_CAPI int32_t U_EXPORT2
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uiter_previous32(UCharIterator *iter) {
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int32_t c, c2;
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c=iter->previous(iter);
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if(UTF_IS_SECOND_SURROGATE(c)) {
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if(UTF_IS_FIRST_SURROGATE(c2=iter->previous(iter))) {
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c=UTF16_GET_PAIR_VALUE(c2, c);
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} else if(c2>=0) {
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/* unmatched second surrogate, undo index movement */
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iter->move(iter, 1, UITER_CURRENT);
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}
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}
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return c;
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}
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U_CDECL_END
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