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/* Copyright (C) 2004-2023 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <cstdlib>
#include <errno.h>
#include <string>
#include "unacpp.h"
#include "unac.h"
#include "log.h"
#include "utf8iter.h"
using namespace std;
bool unacmaybefold(const string &in, string &out, UnacOp what)
{
char *cout = 0;
size_t out_len;
int status = -1;
switch (what) {
case UNACOP_UNAC:
status = unac_u8string(in.c_str(), in.length(), &cout, &out_len);
break;
case UNACOP_UNACFOLD:
status = unacfold_u8string(in.c_str(), in.length(), &cout, &out_len);
break;
case UNACOP_FOLD:
status = fold_u8string(in.c_str(), in.length(), &cout, &out_len);
break;
}
if (status < 0) {
if (cout)
free(cout);
out = string("unac_string failed, errno : ") + std::to_string(errno);
return false;
}
out.assign(cout, out_len);
if (cout)
free(cout);
return true;
}
std::string unactolower(const std::string& in)
{
std::string out;
unacmaybefold(in, out, UNACOP_FOLD);
return out;
}
// Functions to determine upper-case or accented status could be implemented
// hugely more efficiently inside the unac c code, but there only used for
// testing user-entered terms, so we don't really care.
bool unaciscapital(const string& in)
{
LOGDEB2("unaciscapital: [" << in << "]\n");
if (in.empty())
return false;
Utf8Iter it(in);
string shorter;
it.appendchartostring(shorter);
string lower;
if (!unacmaybefold(shorter, lower, UNACOP_FOLD)) {
LOGINFO("unaciscapital: unac/fold failed for [" << in << "]\n");
return false;
}
Utf8Iter it1(lower);
if (*it != *it1)
return true;
else
return false;
}
// Check if input contains upper case characters. We used to case-fold
// the input and look for a difference, but lowercasing and
// casefolding are actually not exactly the same, for example german
// sharp s folds to ss but lowercases to itself, and greek final sigma
// folds to sigma. So an input containing one of these characters
// would wrongly detected as containing upper case. We now handle a
// few special cases explicitly, by folding them before performing
// the lowercasing. There are actually quite a few other cases of
// lowercase being transformed by casefolding, check Unicode
// CaseFolding.txt for occurrences of SMALL. One more step towards
// ditching everything and using icu...
bool unachasuppercase(const string& _in)
{
LOGDEB("unachasuppercase: in [" << _in << "]\n");
if (_in.empty())
return false;
string in;
Utf8Iter it(_in);
for (; !it.eof(); it++) {
if (*it == 0xdf) {
// s sharp -> ss
in += 's';
in += 's';
} else if (*it == 0x3c2) {
// final sigma -> sigma
in.append("\xcf\x83");
} else {
it.appendchartostring(in);
}
}
LOGDEB("unachasuppercase: folded: [" << in << "]\n");
string lower;
if (!unacmaybefold(in, lower, UNACOP_FOLD)) {
LOGINFO("unachasuppercase: unac/fold failed for [" << in << "]\n");
return false;
}
LOGDEB("unachasuppercase: lower [" << lower << "]\n");
if (lower != in)
return true;
else
return false;
}
bool unachasaccents(const string& in)
{
LOGDEB("unachasaccents: in [" << in << "]\n");
if (in.empty())
return false;
string noac;
if (!unacmaybefold(in, noac, UNACOP_UNAC)) {
LOGINFO("unachasaccents: unac/unac failed for [" << (in) << "]\n" );
return false;
}
LOGDEB("unachasaccents: noac [" << noac << "]\n");
if (noac != in)
return true;
else
return false;
}
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