/**
* search consecutive Japanese/Kanji chars
* @param MbString &$mbText [the haystack]
* @param integer $offset [search neighbors to this offset]
* @return array/false [0/1 = position/length, false otherwise]
*/
protected function searchConsecutiveJpnChars(MbString &$mbText, $offset = 0)
{
$mbText_len = $mbText->strlen();
for ($idx = $offset; $idx < $mbText_len; ++$idx) {
// search a Japanese char/word's location ($idx) in $mbText
if (!$this->mbMustBeJpn->has($mbText[$idx])) {
continue;
}
// search consecutive Japanese chars frontward
for ($idxF = $idx - 1; $idxF >= 0; --$idxF) {
if (!$this->mbMayBeJpnChars->has($mbText[$idxF])) {
break;
}
}
++$idxF;
// position correction
// search consecutive Japanese chars backward
for ($idxB = $idx + 1; $idxB < $mbText_len; ++$idxB) {
if (!$this->mbMayBeJpnChars->has($mbText[$idxB])) {
break;
}
}
--$idxB;
// position correction
// a Japanese region has been found
break;
}
return $idx < $mbText_len ? [$idxF, $idxB - $idxF + 1] : false;
}
protected function replaceRepeatPattern(&$text, array $convTable, $context)
{
// split text into text parts (even key) and symbol parts (odd key)
$textSplit = preg_split($this->punctuationRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE);
$textSplitCnt = count($textSplit);
// get text parts and merge them into a new string to $textNoSymbol
$textNoSymbol = [];
for ($i = 0; $i < $textSplitCnt; $i += 2) {
$textNoSymbol[] =& $textSplit[$i];
}
$textNoSymbol = implode('', $textNoSymbol);
$mbTextNoSymbol = new MbString($textNoSymbol, $this->encoding);
$mbTextNoSymbol_len = $mbTextNoSymbol->strlen();
// do conversion on the de-symboled text, i.e., $mbTextNoSymbol
foreach ($convTable as $sr => &$repArr) {
list($rep, $conditionRegex) = $repArr;
$mbSr = new MbString($sr, $this->encoding);
$mbRep = new MbString($rep, $this->encoding);
$mbSr_len = $mbSr->strlen();
$mbRep_len = $mbRep->strlen();
// skip replacements which will cause different lengths
if ($mbSr_len != $mbRep_len) {
unset($mbSr, $mbRep);
continue;
}
// start the replacement
$seek = -1;
while (true) {
// find the position of the searched string
$seek = $mbTextNoSymbol->strpos($sr, $seek + 1);
if ($seek === false) {
break;
}
// check the $conditionRegex
$textSlice = $mbTextNoSymbol->substr($seek > $context ? $seek - $context : 0, $mbSr_len + $context << 1);
if (!empty($conditionRegex) && !preg_match("/{$conditionRegex}/u", $textSlice)) {
continue;
}
// replace frontward
$seekFront = $seek;
while ($seekFront > 0) {
--$seekFront;
// check $charToCheck is in $sr or not
$charToCheck = $mbTextNoSymbol[$seekFront];
$charToCheckPosInSr = $mbSr->strpos($charToCheck);
if ($charToCheckPosInSr === false) {
break;
}
// replace $charToCheck with the corresponding one
$repChar = $mbRep[$charToCheckPosInSr];
$mbTextNoSymbol->substr_replace_i($repChar, $seekFront, 1);
}
// replace backward
$seekBack = $seek + $mbSr_len;
while ($seekBack < $mbTextNoSymbol_len) {
// check $charToCheck is in $sr or not
$charToCheck = $mbTextNoSymbol[$seekBack];
$charToCheckPosInSr = $mbSr->strpos($charToCheck);
if ($charToCheckPosInSr === false) {
break;
}
// replace $charToCheck with the corresponding one
$repChar = $mbRep[$charToCheckPosInSr];
$mbTextNoSymbol->substr_replace_i($repChar, $seekBack, 1);
++$seekBack;
}
// replace the center
$mbTextNoSymbol->substr_replace_i($rep, $seek, $mbSr_len);
}
unset($mbSr, $mbRep);
}
// patch text parts in $textSplit by using $mbTextNoSymbol
for ($i = $seek = 0; $i < $textSplitCnt; $i += 2) {
$pieceLength = MbString::static_strlen($textSplit[$i], $this->encoding);
$textSplit[$i] = $mbTextNoSymbol->substr($seek, $pieceLength);
$seek += $pieceLength;
}
unset($mbTextNoSymbol);
// re-construct $text by concatenating $textSplit
$text = implode('', $textSplit);
}