le_bool ScriptRun::next()
{
if (scriptEnd >= charLimit) {
return false;
}
scriptCode = -1;
for (scriptStart = scriptEnd; scriptEnd < charLimit; scriptEnd += 1) {
LEUnicode16 high = charArray[scriptEnd];
LEUnicode32 ch = high;
if (scriptEnd < charLimit - 1 && high >= 0xD800 && high <= 0xDBFF)
{
LEUnicode16 low = charArray[scriptEnd + 1];
if (low >= 0xDC00 && low <= 0xDFFF) {
ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
scriptEnd += 1;
}
}
le_int32 sc = getScriptCode(ch);
if (sameScript(scriptCode, sc)) {
if (scriptCode <= 0 && sc > 0) {
scriptCode = sc;
}
} else {
break;
}
}
return true;
}
bool
gfxScriptItemizer::Next(PRUint32& aRunStart, PRUint32& aRunLimit,
PRInt32& aRunScript)
{
/* if we've fallen off the end of the text, we're done */
if (scriptLimit >= textLength) {
return PR_FALSE;
}
SYNC_FIXUP();
scriptCode = HB_SCRIPT_COMMON;
for (scriptStart = scriptLimit; scriptLimit < textLength; scriptLimit += 1) {
PRUint32 ch;
PRInt32 sc;
PRInt32 pairIndex;
PRUint32 startOfChar = scriptLimit;
ch = textPtr[scriptLimit];
/*
* MODIFICATION for Gecko - clear the paired-character stack
* when we see a space character, because we cannot trust
* context outside the current "word" when doing textrun
* construction
*/
if (ch == 0x20) {
while (STACK_IS_NOT_EMPTY()) {
pop();
}
sc = HB_SCRIPT_COMMON;
pairIndex = -1;
} else {
/* decode UTF-16 (may be surrogate pair) */
if (NS_IS_HIGH_SURROGATE(ch) && scriptLimit < textLength - 1) {
PRUint32 low = textPtr[scriptLimit + 1];
if (NS_IS_LOW_SURROGATE(low)) {
ch = SURROGATE_TO_UCS4(ch, low);
scriptLimit += 1;
}
}
sc = gfxUnicodeProperties::GetScriptCode(ch);
pairIndex = getPairIndex(ch);
/*
* Paired character handling:
*
* if it's an open character, push it onto the stack.
* if it's a close character, find the matching open on the
* stack, and use that script code. Any non-matching open
* characters above it on the stack will be poped.
*/
if (pairIndex >= 0) {
if ((pairIndex & 1) == 0) {
push(pairIndex, scriptCode);
} else {
PRInt32 pi = pairIndex & ~1;
while (STACK_IS_NOT_EMPTY() && TOP().pairIndex != pi) {
pop();
}
if (STACK_IS_NOT_EMPTY()) {
sc = TOP().scriptCode;
}
}
}
}
if (sameScript(scriptCode, sc)) {
if (scriptCode <= HB_SCRIPT_INHERITED && sc > HB_SCRIPT_INHERITED) {
scriptCode = sc;
fixup(scriptCode);
}
/*
* if this character is a close paired character,
* pop the matching open character from the stack
*/
if (pairIndex >= 0 && (pairIndex & 1) != 0) {
pop();
}
} else {
/*
* reset scriptLimit in case it was advanced during reading a
* multiple-code-unit character
*/
scriptLimit = startOfChar;
break;
}
}
aRunStart = scriptStart;
aRunLimit = scriptLimit;
aRunScript = scriptCode;
return PR_TRUE;
}
