/**
* Relational pipes
* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
*
* 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, version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <sstream>
#include "UnescapingProcessor.h"
using namespace std;
using namespace relpipe::writer;
namespace relpipe {
namespace in {
namespace ini {
namespace lib {
class BasicUnescapingProcessor : public UnescapingProcessor {
public:
std::string unescape(const std::string& s, const TextType type) override {
std::stringstream result;
for (int i = 0, length = s.size(); i < length; i++) {
char ch = s[i];
if (i + 1 < length && ch == ESC) {
ch = s[i + 1];
if (ch == 'n') put(result, '\n', i);
else if (ch == 'r') put(result, '\r', i);
else if (ch == 't') put(result, '\t', i);
else if (ch == 's') put(result, ' ', i); // TODO: Reconsider what is „basic“ escaping and should be supported.
else if (ch == '"') put(result, ch, i); // The delimiters (\n,]",') are already unescaped during the first stage in the INIReader while parsing (the delimiter relevant to given environment is unescaped, e.g. \" in "quoted" value).
else if (ch == '\'') put(result, ch, i); // So it does not necessary to do it here. But someone might write a="xxx\'zzz" however it is superfluous because a="xxx'zzz" will also work.
else if (ch == ']') put(result, ch, i);
else if (ch == ':') put(result, ch, i);
else if (ch == ';') put(result, ch, i);
else if (ch == '#') put(result, ch, i);
else if (ch == '=') put(result, ch, i);
else if (ch == ESC) put(result, ESC, i).put(ESC); // copy and skip even the second \ to avoid its misinterpretation in the next cycle
else result.put(ESC); // keep the escape sequence for later unescaping phase
} else if (ch == ESC) {
throw std::logic_error(std::string("Missing escape sequence")); // this should not happen
} else {
result.put(ch);
}
}
return result.str();
}
};
}
}
}
}