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/*
* SPDX-FileCopyrightText: 2021~2021 CSSlayer <wengxt@gmail.com>
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
*/
#include <string>
namespace fcitx::gtk {
enum class UnescapeState { NORMAL, ESCAPE };
bool unescape(std::string &str) {
if (str.empty()) {
return true;
}
bool unescapeQuote = false;
// having quote at beginning and end, escape
if (str.size() >= 2 && str.front() == '"' && str.back() == '"') {
unescapeQuote = true;
str.pop_back();
str.erase(0, 1);
}
size_t i = 0;
size_t j = 0;
UnescapeState state = UnescapeState::NORMAL;
do {
switch (state) {
case UnescapeState::NORMAL:
if (str[i] == '\\') {
state = UnescapeState::ESCAPE;
} else {
str[j] = str[i];
j++;
}
break;
case UnescapeState::ESCAPE:
if (str[i] == '\\') {
str[j] = '\\';
j++;
} else if (str[i] == 'n') {
str[j] = '\n';
j++;
} else if (str[i] == '\"' && unescapeQuote) {
str[j] = '\"';
j++;
} else {
return false;
}
state = UnescapeState::NORMAL;
break;
}
} while (str[i++]);
str.resize(j - 1);
return true;
}
} // namespace fcitx::gtk
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