/**
* Returns true if the specfied position is a boundary position. As a side
* effect, leaves the iterator pointing to the first boundary position at
* or after "offset".
* @param offset the offset to check.
* @return True if "offset" is a boundary position.
*/
UBool BreakIterator::isBoundary(int32_t offset) {
// the beginning index of the iterator is always a boundary position by definition
if (offset == 0) {
first(); // For side effects on current position, tag values.
return TRUE;
}
if (offset == (int32_t)utext_nativeLength(fText)) {
last(); // For side effects on current position, tag values.
return TRUE;
}
// out-of-range indexes are never boundary positions
if (offset < 0) {
first(); // For side effects on current position, tag values.
return FALSE;
}
if (offset > utext_nativeLength(fText)) {
last(); // For side effects on current position, tag values.
return FALSE;
}
// otherwise, we can use following() on the position before the specified
// one and return true if the position we get back is the one the user
// specified
utext_previous32From(fText, offset);
int32_t backOne = (int32_t)UTEXT_GETNATIVEINDEX(fText);
UBool result = following(backOne) == offset;
return result;
}
/**
* Sets the current iteration position to the end of the text.
* @return The text's past-the-end offset.
*/
int32_t BreakIterator::last(void) {
reset();
if (fText == NULL) {
fLastRuleStatusIndex = 0;
fLastStatusIndexValid = TRUE;
return BreakIterator::DONE;
}
fLastStatusIndexValid = FALSE;
int32_t pos = (int32_t)utext_nativeLength(fText);
utext_setNativeIndex(fText, pos);
return pos;
}
//---------------------------------------------------------------------
//
// pattern
//
//---------------------------------------------------------------------
UnicodeString RegexPattern::pattern() const {
if (fPatternString != NULL) {
return *fPatternString;
} else if (fPattern == NULL) {
return UnicodeString();
} else {
UErrorCode status = U_ZERO_ERROR;
int64_t nativeLen = utext_nativeLength(fPattern);
int32_t len16 = utext_extract(fPattern, 0, nativeLen, NULL, 0, &status); // buffer overflow error
UnicodeString result;
status = U_ZERO_ERROR;
UChar *resultChars = result.getBuffer(len16);
utext_extract(fPattern, 0, nativeLen, resultChars, len16, &status); // unterminated warning
result.releaseBuffer(len16);
return result;
}
}
/**
* Sets the iterator to refer to the last boundary position before the
* specified position.
* @offset The position to begin searching for a break from.
* @return The position of the last boundary before the starting position.
*/
int32_t BreakIterator::preceding(int32_t offset) {
// if we have cached break positions and offset is in the range
// covered by them, use them
if (fCachedBreakPositions != NULL) {
// TODO: binary search?
// TODO: What if offset is outside range, but break is not?
if (offset > fCachedBreakPositions[0]
&& offset <= fCachedBreakPositions[fNumCachedBreakPositions - 1]) {
fPositionInCache = 0;
while (fPositionInCache < fNumCachedBreakPositions
&& offset > fCachedBreakPositions[fPositionInCache])
++fPositionInCache;
--fPositionInCache;
// If we're at the beginning of the cache, need to reevaluate the
// rule status
if (fPositionInCache <= 0) {
fLastStatusIndexValid = FALSE;
}
utext_setNativeIndex(fText, fCachedBreakPositions[fPositionInCache]);
return fCachedBreakPositions[fPositionInCache];
}
else {
reset();
}
}
// if the offset passed in is already past the end of the text,
// just return DONE; if it's before the beginning, return the
// text's starting offset
if (fText == NULL || offset > utext_nativeLength(fText)) {
// return BreakIterator::DONE;
return last();
}
else if (offset < 0) {
return first();
}
// if we start by updating the current iteration position to the
// position specified by the caller, we can just use previous()
// to carry out this operation
if (fSafeFwdTable != NULL) {
// new rule syntax
utext_setNativeIndex(fText, offset);
int32_t newOffset = (int32_t)UTEXT_GETNATIVEINDEX(fText);
if (newOffset != offset) {
// Will come here if specified offset was not a code point boundary AND
// the underlying implmentation is using UText, which snaps any non-code-point-boundary
// indices to the containing code point.
// For breakitereator::preceding only, these non-code-point indices need to be moved
// up to refer to the following codepoint.
UTEXT_NEXT32(fText);
offset = (int32_t)UTEXT_GETNATIVEINDEX(fText);
}
// TODO: (synwee) would it be better to just check for being in the middle of a surrogate pair,
// rather than adjusting the position unconditionally?
// (Change would interact with safe rules.)
// TODO: change RBBI behavior for off-boundary indices to match that of UText?
// affects only preceding(), seems cleaner, but is slightly different.
UTEXT_PREVIOUS32(fText);
handleNext(fSafeFwdTable);
int32_t result = (int32_t)UTEXT_GETNATIVEINDEX(fText);
while (result >= offset) {
result = previous();
}
return result;
}
if (fSafeRevTable != NULL) {
// backup plan if forward safe table is not available
// TODO: check whether this path can be discarded
// It's probably OK to say that rules must supply both safe tables
// if they use safe tables at all. We have certainly never described
// to anyone how to work with just one safe table.
utext_setNativeIndex(fText, offset);
UTEXT_NEXT32(fText);
// handle previous will give result <= offset
handlePrevious(fSafeRevTable);
// next will give result 0 or 1 boundary away from offset,
// most of the time
// we have to
int32_t oldresult = next();
while (oldresult < offset) {
int32_t result = next();
if (result >= offset) {
return oldresult;
}
oldresult = result;
}
int32_t result = previous();
if (result >= offset) {
return previous();
}
return result;
}
// old rule syntax
utext_setNativeIndex(fText, offset);
return previous();
}
/**
* Sets the iterator to refer to the first boundary position following
* the specified position.
* @offset The position from which to begin searching for a break position.
* @return The position of the first break after the current position.
*/
int32_t BreakIterator::following(int32_t offset) {
// if we have cached break positions and offset is in the range
// covered by them, use them
// TODO: could use binary search
// TODO: what if offset is outside range, but break is not?
if (fCachedBreakPositions != NULL) {
if (offset >= fCachedBreakPositions[0]
&& offset < fCachedBreakPositions[fNumCachedBreakPositions - 1]) {
fPositionInCache = 0;
// We are guaranteed not to leave the array due to range test above
while (offset >= fCachedBreakPositions[fPositionInCache]) {
++fPositionInCache;
}
int32_t pos = fCachedBreakPositions[fPositionInCache];
utext_setNativeIndex(fText, pos);
return pos;
}
else {
reset();
}
}
// if the offset passed in is already past the end of the text,
// just return DONE; if it's before the beginning, return the
// text's starting offset
fLastRuleStatusIndex = 0;
fLastStatusIndexValid = TRUE;
if (fText == NULL || offset >= utext_nativeLength(fText)) {
last();
return next();
}
else if (offset < 0) {
return first();
}
// otherwise, set our internal iteration position (temporarily)
// to the position passed in. If this is the _beginning_ position,
// then we can just use next() to get our return value
int32_t result = 0;
if (fSafeRevTable != NULL) {
// new rule syntax
utext_setNativeIndex(fText, offset);
// move forward one codepoint to prepare for moving back to a
// safe point.
// this handles offset being between a supplementary character
UTEXT_NEXT32(fText);
// handlePrevious will move most of the time to < 1 boundary away
handlePrevious(fSafeRevTable);
int32_t result = next();
while (result <= offset) {
result = next();
}
return result;
}
if (fSafeFwdTable != NULL) {
// backup plan if forward safe table is not available
utext_setNativeIndex(fText, offset);
UTEXT_PREVIOUS32(fText);
// handle next will give result >= offset
handleNext(fSafeFwdTable);
// previous will give result 0 or 1 boundary away from offset,
// most of the time
// we have to
int32_t oldresult = previous();
while (oldresult > offset) {
int32_t result = previous();
if (result <= offset) {
return oldresult;
}
oldresult = result;
}
int32_t result = next();
if (result <= offset) {
return next();
}
return result;
}
// otherwise, we have to sync up first. Use handlePrevious() to back
// up to a known break position before the specified position (if
// we can determine that the specified position is a break position,
// we don't back up at all). This may or may not be the last break
// position at or before our starting position. Advance forward
// from here until we've passed the starting position. The position
// we stop on will be the first break position after the specified one.
// old rule syntax
utext_setNativeIndex(fText, offset);
if (offset==0 ||
offset==1 && utext_getNativeIndex(fText)==0) {
return next();
}
result = previous();
while (result != BreakIterator::DONE && result <= offset) {
result = next();
}
return result;
}
static void TestAPI(void) {
UErrorCode status = U_ZERO_ERROR;
UBool gFailed = FALSE;
(void)gFailed; /* Suppress set but not used warning. */
/* Open */
{
UText utLoc = UTEXT_INITIALIZER;
const char * cString = "\x61\x62\x63\x64";
UChar uString[] = {0x41, 0x42, 0x43, 0};
UText *uta;
UText *utb;
UChar c;
uta = utext_openUChars(NULL, uString, -1, &status);
TEST_SUCCESS(status);
c = utext_next32(uta);
TEST_ASSERT(c == 0x41);
utb = utext_close(uta);
TEST_ASSERT(utb == NULL);
uta = utext_openUTF8(&utLoc, cString, -1, &status);
TEST_SUCCESS(status);
TEST_ASSERT(uta == &utLoc);
uta = utext_close(&utLoc);
TEST_ASSERT(uta == &utLoc);
}
/* utext_clone() */
{
UChar uString[] = {0x41, 0x42, 0x43, 0};
int64_t len;
UText *uta;
UText *utb;
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, uString, -1, &status);
TEST_SUCCESS(status);
utb = utext_clone(NULL, uta, FALSE, FALSE, &status);
TEST_SUCCESS(status);
TEST_ASSERT(utb != NULL);
TEST_ASSERT(utb != uta);
len = utext_nativeLength(uta);
TEST_ASSERT(len == u_strlen(uString));
utext_close(uta);
utext_close(utb);
}
/* basic access functions */
{
UChar uString[] = {0x41, 0x42, 0x43, 0};
UText *uta;
UChar32 c;
int64_t len;
UBool b;
int64_t i;
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, uString, -1, &status);
TEST_ASSERT(uta!=NULL);
TEST_SUCCESS(status);
b = utext_isLengthExpensive(uta);
TEST_ASSERT(b==TRUE);
len = utext_nativeLength(uta);
TEST_ASSERT(len == u_strlen(uString));
b = utext_isLengthExpensive(uta);
TEST_ASSERT(b==FALSE);
c = utext_char32At(uta, 0);
TEST_ASSERT(c==uString[0]);
c = utext_current32(uta);
TEST_ASSERT(c==uString[0]);
c = utext_next32(uta);
TEST_ASSERT(c==uString[0]);
c = utext_current32(uta);
TEST_ASSERT(c==uString[1]);
c = utext_previous32(uta);
TEST_ASSERT(c==uString[0]);
c = utext_current32(uta);
TEST_ASSERT(c==uString[0]);
c = utext_next32From(uta, 1);
TEST_ASSERT(c==uString[1]);
c = utext_next32From(uta, u_strlen(uString));
TEST_ASSERT(c==U_SENTINEL);
c = utext_previous32From(uta, 2);
TEST_ASSERT(c==uString[1]);
i = utext_getNativeIndex(uta);
TEST_ASSERT(i == 1);
utext_setNativeIndex(uta, 0);
b = utext_moveIndex32(uta, 1);
TEST_ASSERT(b==TRUE);
i = utext_getNativeIndex(uta);
TEST_ASSERT(i==1);
b = utext_moveIndex32(uta, u_strlen(uString)-1);
TEST_ASSERT(b==TRUE);
i = utext_getNativeIndex(uta);
TEST_ASSERT(i==u_strlen(uString));
b = utext_moveIndex32(uta, 1);
TEST_ASSERT(b==FALSE);
i = utext_getNativeIndex(uta);
TEST_ASSERT(i==u_strlen(uString));
utext_setNativeIndex(uta, 0);
c = UTEXT_NEXT32(uta);
TEST_ASSERT(c==uString[0]);
c = utext_current32(uta);
TEST_ASSERT(c==uString[1]);
c = UTEXT_PREVIOUS32(uta);
TEST_ASSERT(c==uString[0]);
c = UTEXT_PREVIOUS32(uta);
TEST_ASSERT(c==U_SENTINEL);
utext_close(uta);
}
{
/*
* UText opened on a NULL string with zero length
*/
UText *uta;
UChar32 c;
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, NULL, 0, &status);
TEST_SUCCESS(status);
c = UTEXT_NEXT32(uta);
TEST_ASSERT(c == U_SENTINEL);
utext_close(uta);
uta = utext_openUTF8(NULL, NULL, 0, &status);
TEST_SUCCESS(status);
c = UTEXT_NEXT32(uta);
TEST_ASSERT(c == U_SENTINEL);
utext_close(uta);
}
{
/*
* extract
*/
UText *uta;
UChar uString[] = {0x41, 0x42, 0x43, 0};
UChar buf[100];
int32_t i;
/* Test pinning of input bounds */
UChar uString2[] = {0x41, 0x42, 0x43, 0x44, 0x45,
0x46, 0x47, 0x48, 0x49, 0x4A, 0};
UChar * uString2Ptr = uString2 + 5;
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, uString, -1, &status);
TEST_SUCCESS(status);
status = U_ZERO_ERROR;
i = utext_extract(uta, 0, 100, NULL, 0, &status);
TEST_ASSERT(status==U_BUFFER_OVERFLOW_ERROR);
TEST_ASSERT(i == u_strlen(uString));
status = U_ZERO_ERROR;
memset(buf, 0, sizeof(buf));
i = utext_extract(uta, 0, 100, buf, 100, &status);
TEST_SUCCESS(status);
TEST_ASSERT(i == u_strlen(uString));
i = u_strcmp(uString, buf);
TEST_ASSERT(i == 0);
utext_close(uta);
/* Test pinning of input bounds */
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, uString2Ptr, -1, &status);
TEST_SUCCESS(status);
status = U_ZERO_ERROR;
memset(buf, 0, sizeof(buf));
i = utext_extract(uta, -3, 20, buf, 100, &status);
TEST_SUCCESS(status);
TEST_ASSERT(i == u_strlen(uString2Ptr));
i = u_strcmp(uString2Ptr, buf);
TEST_ASSERT(i == 0);
utext_close(uta);
}
{
/*
* Copy, Replace, isWritable
* Can't create an editable UText from plain C, so all we
* can easily do is check that errors returned.
*/
UText *uta;
UChar uString[] = {0x41, 0x42, 0x43, 0};
UBool b;
status = U_ZERO_ERROR;
uta = utext_openUChars(NULL, uString, -1, &status);
TEST_SUCCESS(status);
b = utext_isWritable(uta);
TEST_ASSERT(b == FALSE);
b = utext_hasMetaData(uta);
TEST_ASSERT(b == FALSE);
utext_replace(uta,
0, 1, /* start, limit */
uString, -1, /* replacement, replacement length */
&status);
TEST_ASSERT(status == U_NO_WRITE_PERMISSION);
utext_copy(uta,
0, 1, /* start, limit */
2, /* destination index */
FALSE, /* move flag */
&status);
TEST_ASSERT(status == U_NO_WRITE_PERMISSION);
utext_close(uta);
}
}