CAMLprim value mlre2__find_first(value v_regex, value v_sub, value v_str) {
CAMLparam2(v_regex, v_str);
CAMLlocal1(v_retval);
CAMLlocalN(error_args, 2);
const RE2 * re = Regex_val(v_regex);
const char* input = String_val(v_str);
int len = caml_string_length(v_str);
StringPiece str = StringPiece(input, len);
int n = Int_val(v_sub) + 1;
StringPiece * submatches = new StringPiece[n];
assert_valid_sub(re, v_sub);
if (! re->Match(str, 0, str.length(), RE2::UNANCHORED, submatches, n)) {
delete[] submatches;
caml_raise_with_string(*caml_named_value("mlre2__Regex_match_failed"),
re->pattern().c_str());
}
StringPiece * sub = submatches + Int_val(v_sub);
if (!sub->data()) {
delete[] submatches;
error_args[0] = caml_copy_string(re->pattern().c_str());
error_args[1] = v_sub;
caml_raise_with_args(*caml_named_value("mlre2__Regex_submatch_did_not_capture"),
2, error_args);
}
v_retval = caml_alloc_string(sub->length());
memcpy(String_val(v_retval), String_val(v_str) + (sub->data() - input), sub->length());
delete[] submatches;
CAMLreturn(v_retval);
}
void SplitStringKeepEmpty(
const StringPiece& full,
const StringPiece& delim,
std::vector<std::string>* result)
{
// 单个字符的分隔符转调字符版本的分割函数，要快一些
if (delim.length() == 1)
{
SplitStringKeepEmpty(full, delim[0], result);
return;
}
result->clear();
if (full.empty() || delim.empty())
return;
size_t prev_pos = 0;
size_t pos;
std::string token;
while ((pos = full.find(delim, prev_pos)) != std::string::npos)
{
token.assign(full.data() + prev_pos, pos - prev_pos);
result->push_back(token);
prev_pos = pos + delim.length();
}
token.assign(full.data() + prev_pos, full.length() - prev_pos);
result->push_back(token);
}
static int new_pos(const char *input, StringPiece &remaining, int startpos, StringPiece &match) {
if (remaining.length() < 0) {
return -1;
} else {
/* casting these size_t's to int is safe because StringPiece's track
* their lengths using ints */
size_t first_unexamined = remaining.data() + startpos - input;
size_t first_unmatched = match.data() - input + match.length();
return (int) (first_unexamined > first_unmatched ? first_unexamined : first_unmatched);
}
}
UCollationResult Collator::compareUTF8(const StringPiece &source,
const StringPiece &target,
UErrorCode &status) const {
if(U_FAILURE(status)) {
return UCOL_EQUAL;
}
UCharIterator sIter, tIter;
uiter_setUTF8(&sIter, source.data(), source.length());
uiter_setUTF8(&tIter, target.data(), target.length());
return compare(sIter, tIter, status);
}
std::u16string utf8ToUtf16(const StringPiece& utf8) {
ssize_t utf16Length = utf8_to_utf16_length(reinterpret_cast<const uint8_t*>(utf8.data()),
utf8.length());
if (utf16Length <= 0) {
return {};
}
std::u16string utf16;
utf16.resize(utf16Length);
utf8_to_utf16(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length(), &*utf16.begin());
return utf16;
}
/* this is to ensure we don't return the same zero-length match forever */
static int ensure_progress(StringPiece &str, const StringPiece &match) {
static RE2 re(".");
if (match.length() > 0) {
return match.length();
} else if (str.length() > 0) {
StringPiece str_copy = str;
/* Drops one character from the front of the StringPiece.
Implemented using a regex call because that's the easiest way
to handle multibyte Unicode characters. */
RE2::Consume(&str_copy, re);
return (int) (str_copy.data() - str.data());
} else return 1; /* we halt on negative length strings, so this value is arbitrary */
}
/// Return the vocID of word "text" if it exist in the vocabulary
/// Otherwise return 0
IndexType C_IDVocabulary::returnId(const StringPiece &text) const {
StringPiece stemmed(text);
if (stem_len_ > 0) { //take first stem_len_ characters
stemmed = text.substr(stem_len_);
} else if ((stem_len_ < 0) && (text.length() > -stem_len_)) {//take last stem_len_ characters
stemmed = text.substr(text.length() + stem_len_, -stem_len_);
} //otherwise leave as it is
WordId::const_iterator iter = word_id_.find(stemmed);
if(iter == word_id_.end()) {
return 0;
} else {
return iter->second;
}
}
// -------------------------------------
void
DigitList::set(const StringPiece &source, UErrorCode &status) {
if (U_FAILURE(status)) {
return;
}
// Figure out a max number of digits to use during the conversion, and
// resize the number up if necessary.
int32_t numDigits = source.length();
if (numDigits > fContext.digits) {
fContext.digits = numDigits;
char *t = fStorage.resize(sizeof(decNumber) + numDigits, fStorage.getCapacity());
if (t == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
fDecNumber = (decNumber *)fStorage.getAlias();
}
fContext.status = 0;
uprv_decNumberFromString(fDecNumber, source.data(), &fContext);
if ((fContext.status & DEC_Conversion_syntax) != 0) {
status = U_DECIMAL_NUMBER_SYNTAX_ERROR;
}
fHaveDouble = FALSE;
}
void DoSplitLines(
const StringPiece& full,
std::vector<StringType>* result,
bool keep_line_endling
)
{
result->clear();
size_t prev_pos = 0;
size_t pos;
StringType token;
while ((pos = full.find('\n', prev_pos)) != std::string::npos)
{
token.assign(full.data() + prev_pos, pos - prev_pos + 1);
if (!keep_line_endling)
RemoveLineEnding(&token);
result->push_back(token);
prev_pos = pos + 1;
}
if (prev_pos < full.size())
{
token.assign(full.data() + prev_pos, full.length() - prev_pos);
if (!keep_line_endling)
RemoveLineEnding(&token);
result->push_back(token);
}
}
// For each character in characters_wanted, sets the index corresponding
// to the ASCII code of that character to 1 in table. This is used by
// the m_find.*_of methods below to tell whether or not a character is in
// the lookup table in constant time.
// The argument `table' must be an array that is large enough to hold all
// the possible values of an unsigned char. Thus it should be be declared
// as follows:
// bool table[UCHAR_MAX + 1]
static inline void BuildLookupTable(const StringPiece& characters_wanted,
bool* table) {
const size_type length = characters_wanted.length();
const char* const data = characters_wanted.data();
for (size_type i = 0; i < length; ++i) {
table[static_cast<unsigned char>(data[i])] = true;
}
}
CAMLprim value mlre2__find_all(value v_regex, value v_sub, value v_str) {
CAMLparam2(v_regex, v_str);
CAMLlocal3(v_retval, v_car, v_cons);
std::vector<StringPiece> results;
const RE2 * re = Regex_val(v_regex);
const char* input = String_val(v_str);
int len = caml_string_length(v_str);
StringPiece str = StringPiece(input, len);
int n = Int_val(v_sub) + 1;
int startpos = 0;
StringPiece * matches = new StringPiece[n];
StringPiece * sub = matches + Int_val(v_sub);
assert_valid_sub(re, v_sub);
while (str.length() > startpos
&& re->Match(str, startpos, str.length(), RE2::UNANCHORED, matches, n)) {
startpos += ensure_progress(str, matches[0]);
startpos = new_pos(input, str, startpos, matches[0]);
/* push_back followed by back-to-front consing gives the correct final order */
if (sub->data()) {
results.push_back(*sub);
}
}
if (results.size() <= 0) {
delete[] matches;
caml_raise_with_string(*caml_named_value("mlre2__Regex_match_failed"),
re->pattern().c_str());
}
v_retval = Val_emptylist;
for (std::vector<StringPiece>::reverse_iterator it = results.rbegin(); it != results.rend(); ++it) {
v_car = caml_alloc_string(it->length());
memcpy(String_val(v_car), String_val(v_str) + (it->data() - input), it->length());
v_cons = caml_alloc_small(2, Tag_cons);
Field(v_cons, 0) = v_car;
Field(v_cons, 1) = v_retval;
v_retval = v_cons;
}
delete[] matches;
CAMLreturn(v_retval);
}
void CaseMap::utf8ToUpper(
const char *locale, uint32_t options,
StringPiece src, ByteSink &sink, Edits *edits,
UErrorCode &errorCode) {
ucasemap_mapUTF8(
ustrcase_getCaseLocale(locale), options, UCASEMAP_BREAK_ITERATOR_NULL
src.data(), src.length(),
ucasemap_internalUTF8ToUpper, sink, edits, errorCode);
}
void CaseMap::utf8Fold(
uint32_t options,
StringPiece src, ByteSink &sink, Edits *edits,
UErrorCode &errorCode) {
ucasemap_mapUTF8(
UCASE_LOC_ROOT, options, UCASEMAP_BREAK_ITERATOR_NULL
src.data(), src.length(),
ucasemap_internalUTF8Fold, sink, edits, errorCode);
}
static jobject NativeDecimalFormat_parse(JNIEnv* env, jclass, jlong addr, jstring text,
jobject position, jboolean parseBigDecimal) {
static jmethodID gPP_getIndex = env->GetMethodID(JniConstants::parsePositionClass, "getIndex", "()I");
static jmethodID gPP_setIndex = env->GetMethodID(JniConstants::parsePositionClass, "setIndex", "(I)V");
static jmethodID gPP_setErrorIndex = env->GetMethodID(JniConstants::parsePositionClass, "setErrorIndex", "(I)V");
ScopedJavaUnicodeString src(env, text);
if (!src.valid()) {
return NULL;
}
// make sure the ParsePosition is valid. Actually icu4c would parse a number
// correctly even if the parsePosition is set to -1, but since the RI fails
// for that case we have to fail too
int parsePos = env->CallIntMethod(position, gPP_getIndex, NULL);
if (parsePos < 0 || parsePos > env->GetStringLength(text)) {
return NULL;
}
Formattable res;
ParsePosition pp(parsePos);
DecimalFormat* fmt = toDecimalFormat(addr);
fmt->parse(src.unicodeString(), res, pp);
if (pp.getErrorIndex() == -1) {
env->CallVoidMethod(position, gPP_setIndex, pp.getIndex());
} else {
env->CallVoidMethod(position, gPP_setErrorIndex, pp.getErrorIndex());
return NULL;
}
if (parseBigDecimal) {
UErrorCode status = U_ZERO_ERROR;
StringPiece str = res.getDecimalNumber(status);
if (U_SUCCESS(status)) {
int len = str.length();
const char* data = str.data();
if (strncmp(data, "NaN", 3) == 0 ||
strncmp(data, "Inf", 3) == 0 ||
strncmp(data, "-Inf", 4) == 0) {
double resultDouble = res.getDouble(status);
return doubleValueOf(env, resultDouble);
}
return newBigDecimal(env, data, len);
}
return NULL;
}
switch (res.getType()) {
case Formattable::kDouble: return doubleValueOf(env, res.getDouble());
case Formattable::kLong: return longValueOf(env, res.getLong());
case Formattable::kInt64: return longValueOf(env, res.getInt64());
default: return NULL;
}
}
CAMLprim value mlre2__iter_next(value v_regex, value v_pos,
value v_max_submatch, value v_input) {
CAMLparam2(v_regex, v_input);
CAMLlocal3(v_retval, v_match_array, v_match);
/* [v_retval] is the return value.
* [v_match_array] is the array used to return captured substrings
* [v_match] is the substring captured by a submatch.
*/
const RE2 * re = Regex_val(v_regex);
const char * input = String_val(v_input);
int startpos = Int_val(v_pos);
int len = caml_string_length(v_input);
StringPiece str = StringPiece(input, len);
int max_submatch = Int_val(v_max_submatch) < 0
? re->NumberOfCapturingGroups()
: Int_val(v_max_submatch);
/* +1 for whole match ("subpattern zero") */
int n = 1 + (max_submatch > 0 ? max_submatch : 0);
StringPiece *submatches = new StringPiece[n];
StringPiece *sub = submatches; /* extra pointer for iterating over [submatches] */
if (str.length() < startpos
|| ! re->Match(str, startpos, str.length(), RE2::UNANCHORED, submatches, n)) {
PAIR(v_retval, Val_int(-1), Val_none);
} else {
startpos += ensure_progress(str, submatches[0]);
v_match_array = caml_alloc_tuple(n);
for (int i = 0; i < n; ++i) {
sub = submatches + i;
if (sub->data()) {
PAIR(v_retval, Val_int((int)(sub->data() - input)), Val_int(sub->length()));
SOME(v_match, v_retval);
} else v_match = Val_none;
Store_field(v_match_array, i, v_match);
}
SOME(v_match, v_match_array);
PAIR(v_retval, Val_int(new_pos(input, str, startpos, submatches[0])), v_match);
}
delete[] submatches;
CAMLreturn(v_retval);
}
/**
* Set the DigitList from a decimal number string.
*
* The incoming string _must_ be nul terminated, even though it is arriving
* as a StringPiece because that is what the decNumber library wants.
* We can get away with this for an internal function; it would not
* be acceptable for a public API.
*/
void
DigitList::set(StringPiece source, UErrorCode &status, uint32_t /*fastpathBits*/) {
if (U_FAILURE(status)) {
return;
}
#if 0
if(fastpathBits==(kFastpathOk|kNoDecimal)) {
int32_t size = source.size();
const char *data = source.data();
int64_t r = 0;
int64_t m = 1;
// fast parse
while(size>0) {
char ch = data[--size];
if(ch=='+') {
break;
} else if(ch=='-') {
r = -r;
break;
} else {
int64_t d = ch-'0';
//printf("CH[%d]=%c, %d, *=%d\n", size,ch, (int)d, (int)m);
r+=(d)*m;
m *= 10;
}
}
//printf("R=%d\n", r);
set(r);
} else
#endif
{
// Figure out a max number of digits to use during the conversion, and
// resize the number up if necessary.
int32_t numDigits = source.length();
if (numDigits > fContext.digits) {
// fContext.digits == fStorage.getCapacity()
decNumber *t = fStorage.resize(numDigits, fStorage.getCapacity());
if (t == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
fDecNumber = t;
fContext.digits = numDigits;
}
fContext.status = 0;
uprv_decNumberFromString(fDecNumber, source.data(), &fContext);
if ((fContext.status & DEC_Conversion_syntax) != 0) {
status = U_DECIMAL_NUMBER_SYNTAX_ERROR;
}
}
internalClear();
}
void C_IDVocabulary::Insert(const StringPiece &word, IndexType id) {
if (id_word_.size() < id) {
id_word_.resize(id + 1);
}
char *&place = id_word_[id];
if (place) {
StringPiece existing(place);
if (existing != word) {
std::cerr << "Duplicate SALM vocab id " << id << ": " << existing << " and " << word << std::endl;
abort();
} else {
return;
}
}
place = new char[word.length() + 1];
memcpy(place, word.data(), word.length());
place[word.length()] = 0;
std::pair<WordId::iterator, bool> result(word_id_.insert(make_pair(StringPiece(place, word.length()), id)));
if (!result.second) {
std::cerr << "SALM words " << word << " and " << result.first->second << " have the same id " << id << std::endl;
abort();
}
}
// Do not assert in this function since it is used by the asssertion code!
std::wstring SysMultiByteToWide(const StringPiece& mb, uint32 code_page) {
if (mb.empty())
return std::wstring();
int mb_length = static_cast<int>(mb.length());
// Compute the length of the buffer.
int charcount = MultiByteToWideChar(code_page, 0,
mb.data(), mb_length, NULL, 0);
if (charcount == 0)
return std::wstring();
std::wstring wide;
wide.resize(charcount);
MultiByteToWideChar(code_page, 0, mb.data(), mb_length, &wide[0], charcount);
return wide;
}
// This function merges a vector of string components
void JoinStrings(
const std::vector<std::string>& components,
const StringPiece& delim,
std::string* result)
{
size_t length = 0;
for (std::vector<std::string>::const_iterator iter = components.begin();
iter != components.end(); ++iter)
{
if (iter != components.begin())
{
length += delim.length();
}
length += iter->size();
}
result->reserve(length);
return JoinStrings<std::vector<std::string>::const_iterator>(
components.begin(), components.end(), delim, result);
}
// Replace the first "old" pattern with the "new" pattern in a string
std::string ReplaceFirst(
const StringPiece& s,
const StringPiece& oldsub,
const StringPiece& newsub)
{
if (oldsub.empty())
return s.as_string();
std::string res;
std::string::size_type pos = s.find(oldsub);
if (pos == std::string::npos)
return s.as_string();
else
{
res.append(s.data(), pos);
res.append(newsub.data(), newsub.size());
res.append(s.data() + pos + oldsub.size(), s.length() - pos - oldsub.size());
}
return res;
}
// Replace all the "old" pattern with the "new" pattern in a string
std::string ReplaceAll(const StringPiece& s, const StringPiece& oldsub,
const StringPiece& newsub)
{
if (oldsub.empty())
return s.as_string();
std::string res;
std::string::size_type start_pos = 0;
std::string::size_type pos;
do {
pos = s.find(oldsub, start_pos);
if (pos == std::string::npos)
{
break;
}
res.append(s.data() + start_pos, pos - start_pos);
res.append(newsub.data(), newsub.size());
start_pos = pos + oldsub.size();
} while (true);
res.append(s.data() + start_pos, s.length() - start_pos);
return res;
}
/** 功能: 把一个字符串划分成多个字符串
* 参数:
* 输入参数 const StringPiece& full 主字符串
* 输入参数 const StringPiece& delim 字符串分界符号
* 输出参数 std::vector<std::string>& result 分解后的结果
*/
void SplitStringKeepEmpty(
const StringPiece& full,
char delim,
std::vector<std::string>* result)
{
result->clear();
if (full.empty())
return;
size_t prev_pos = 0;
size_t pos;
std::string token;
while ((pos = full.find(delim, prev_pos)) != std::string::npos)
{
token.assign(full.data() + prev_pos, pos - prev_pos);
result->push_back(token);
prev_pos = pos + 1;
}
token.assign(full.data() + prev_pos, full.length() - prev_pos);
result->push_back(token);
}
void DecNum::setTo(StringPiece str, UErrorCode& status) {
// We need NUL-terminated for decNumber; CharString guarantees this, but not StringPiece.
CharString cstr(str, status);
if (U_FAILURE(status)) { return; }
_setTo(cstr.data(), str.length(), status);
}
void
StringTest::TestStringPiece() {
// Default constructor.
StringPiece empty;
if(!empty.empty() || empty.data()!=NULL || empty.length()!=0 || empty.size()!=0) {
errln("StringPiece() failed");
}
// Construct from NULL const char * pointer.
StringPiece null(NULL);
if(!null.empty() || null.data()!=NULL || null.length()!=0 || null.size()!=0) {
errln("StringPiece(NULL) failed");
}
// Construct from const char * pointer.
static const char *abc_chars="abc";
StringPiece abc(abc_chars);
if(abc.empty() || abc.data()!=abc_chars || abc.length()!=3 || abc.size()!=3) {
errln("StringPiece(abc_chars) failed");
}
// Construct from const char * pointer and length.
static const char *abcdefg_chars="abcdefg";
StringPiece abcd(abcdefg_chars, 4);
if(abcd.empty() || abcd.data()!=abcdefg_chars || abcd.length()!=4 || abcd.size()!=4) {
errln("StringPiece(abcdefg_chars, 4) failed");
}
#if U_HAVE_STD_STRING
// Construct from std::string.
std::string uvwxyz_string("uvwxyz");
StringPiece uvwxyz(uvwxyz_string);
if(uvwxyz.empty() || uvwxyz.data()!=uvwxyz_string.data() || uvwxyz.length()!=6 || uvwxyz.size()!=6) {
errln("StringPiece(uvwxyz_string) failed");
}
#endif
// Substring constructor with pos.
StringPiece sp(abcd, -1);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("StringPiece(abcd, -1) failed");
}
sp=StringPiece(abcd, 5);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("StringPiece(abcd, 5) failed");
}
sp=StringPiece(abcd, 2);
if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
errln("StringPiece(abcd, -1) failed");
}
// Substring constructor with pos and len.
sp=StringPiece(abcd, -1, 8);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("StringPiece(abcd, -1, 8) failed");
}
sp=StringPiece(abcd, 5, 8);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("StringPiece(abcd, 5, 8) failed");
}
sp=StringPiece(abcd, 2, 8);
if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
errln("StringPiece(abcd, -1) failed");
}
sp=StringPiece(abcd, 2, -1);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("StringPiece(abcd, 5, -1) failed");
}
// static const npos
const int32_t *ptr_npos=&StringPiece::npos;
if(StringPiece::npos!=0x7fffffff || *ptr_npos!=0x7fffffff) {
errln("StringPiece::npos!=0x7fffffff");
}
// substr() method with pos, using len=npos.
sp=abcd.substr(-1);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("abcd.substr(-1) failed");
}
sp=abcd.substr(5);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("abcd.substr(5) failed");
}
sp=abcd.substr(2);
if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
errln("abcd.substr(-1) failed");
}
// substr() method with pos and len.
sp=abcd.substr(-1, 8);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("abcd.substr(-1, 8) failed");
}
sp=abcd.substr(5, 8);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("abcd.substr(5, 8) failed");
}
sp=abcd.substr(2, 8);
if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
errln("abcd.substr(-1) failed");
}
sp=abcd.substr(2, -1);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("abcd.substr(5, -1) failed");
}
// clear()
sp=abcd;
sp.clear();
if(!sp.empty() || sp.data()!=NULL || sp.length()!=0 || sp.size()!=0) {
errln("abcd.clear() failed");
}
// remove_prefix()
sp=abcd;
sp.remove_prefix(-1);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("abcd.remove_prefix(-1) failed");
}
sp=abcd;
sp.remove_prefix(2);
if(sp.empty() || sp.data()!=abcdefg_chars+2 || sp.length()!=2 || sp.size()!=2) {
errln("abcd.remove_prefix(2) failed");
}
sp=abcd;
sp.remove_prefix(5);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("abcd.remove_prefix(5) failed");
}
// remove_suffix()
sp=abcd;
sp.remove_suffix(-1);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=4 || sp.size()!=4) {
errln("abcd.remove_suffix(-1) failed");
}
sp=abcd;
sp.remove_suffix(2);
if(sp.empty() || sp.data()!=abcdefg_chars || sp.length()!=2 || sp.size()!=2) {
errln("abcd.remove_suffix(2) failed");
}
sp=abcd;
sp.remove_suffix(5);
if(!sp.empty() || sp.length()!=0 || sp.size()!=0) {
errln("abcd.remove_suffix(5) failed");
}
}
CAMLprim value mlre2__matches(value v_regex, value v_str) {
StringPiece str = String_val(v_str);
return Val_int(Regex_val(v_regex)->Match(str, 0, str.length(),
RE2::UNANCHORED, NULL, 0));
}
bool StringStartsWithIgnoreCase(const StringPiece& str, const StringPiece& prefix)
{
return str.size() >= prefix.size() &&
memcasecmp(str.data(), prefix.data(), prefix.length()) == 0;
}