783762a958
After open-source-parsers/jsoncpp@42a161f commit jsoncpp's version of valueToQuotedString no longer fits our needs, because too many UTF-8 characters are unnecessarily escaped. To remedy that, this commit provides our own string quoting implementation. Reported-by: Nadav Har'El <nyh@scylladb.com> Refs #3622
81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/*
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* Copyright (C) 2018 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "json.hh"
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namespace seastar {
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namespace json {
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static inline bool is_control_char(char c) {
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return c >= 0 && c <= 0x1F;
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}
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static inline bool needs_escaping(const sstring& s) {
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return std::any_of(s.begin(), s.end(), [](char c) {return is_control_char(c) || c == '"' || c == '\\';});
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}
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sstring value_to_quoted_string(const sstring& value) {
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if (!needs_escaping(value)) {
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return sprint("\"%s\"", value);
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}
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std::ostringstream oss;
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oss << std::hex << std::uppercase << std::setfill('0');
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oss.put('"');
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for (char c : value) {
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switch (c) {
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case '"':
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oss.put('\\').put('"');
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break;
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case '\\':
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oss.put('\\').put('\\');
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break;
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case '\b':
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oss.put('\\').put('b');
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break;
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case '\f':
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oss.put('\\').put('f');
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break;
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case '\n':
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oss.put('\\').put('n');
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break;
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case '\r':
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oss.put('\\').put('r');
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break;
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case '\t':
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oss.put('\\').put('t');
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break;
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default:
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if (is_control_char(c)) {
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oss.put('\\').put('u') << std::setw(4) << static_cast<int>(c);
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} else {
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oss.put(c);
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}
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break;
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}
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}
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oss.put('"');
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return oss.str();
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}
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}
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}
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