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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* JsonPointer.cpp
* An implementation of RFC 6901.
* Copyright (C) 2014 Simon Newton
*/
#include <string>
#include "ola/web/JsonPointer.h"
#include "ola/StringUtils.h"
namespace ola {
namespace web {
using std::string;
using std::vector;
JsonPointer::JsonPointer()
: m_is_valid(true) {
}
JsonPointer::JsonPointer(const JsonPointer &other)
: m_is_valid(other.m_is_valid),
m_tokens(other.m_tokens) {
}
JsonPointer::JsonPointer(const string &path)
: m_is_valid(true) {
if (path.empty()) {
return;
}
if (path[0] != '/') {
m_is_valid = false;
return;
}
Tokens escaped_tokens;
StringSplit(path.substr(1), &escaped_tokens, "/");
Tokens::const_iterator iter = escaped_tokens.begin();
for (; iter != escaped_tokens.end(); ++iter) {
m_tokens.push_back(UnEscapeString(*iter));
}
}
bool JsonPointer::operator==(const JsonPointer &other) const {
return m_tokens == other.m_tokens;
}
void JsonPointer::Push(const string &token) {
m_tokens.push_back(token);
}
void JsonPointer::Pop() {
if (!m_tokens.empty()) {
m_tokens.pop_back();
}
}
string JsonPointer::ToString() const {
string path;
if (!m_tokens.empty()) {
Tokens::const_iterator iter = m_tokens.begin();
path.push_back('/');
while (iter != m_tokens.end()) {
path.append(EscapeString(*iter++));
if (iter != m_tokens.end()) {
path.push_back('/');
}
}
}
return path;
}
bool JsonPointer::IsPrefixOf(const JsonPointer &other) const {
if (!(IsValid() && other.IsValid())) {
return false;
}
Tokens::const_iterator our_iter = m_tokens.begin();
Tokens::const_iterator other_iter = other.m_tokens.begin();
for (; our_iter != m_tokens.end() && other_iter != other.m_tokens.end();
our_iter++, other_iter++) {
if (*our_iter != *other_iter) {
return false;
}
}
return other_iter != other.m_tokens.end();
}
string JsonPointer::EscapeString(const string &input) {
string escaped_property;
escaped_property.reserve(input.size());
for (string::const_iterator iter = input.begin(); iter != input.end();
++iter) {
switch (*iter) {
case '~':
escaped_property.push_back(*iter);
escaped_property.push_back('0');
break;
case '/':
escaped_property.push_back('~');
escaped_property.push_back('1');
break;
default:
escaped_property.push_back(*iter);
}
}
return escaped_property;
}
string JsonPointer::UnEscapeString(const string &input) {
string token = input;
size_t pos = 0;
// Section 4 of the RFC explains why we do it in this order.
while ((pos = token.find("~1")) != string::npos) {
token[pos] = '/';
token.erase(pos + 1, 1);
}
while ((pos = token.find("~0")) != string::npos) {
token[pos] = '~';
token.erase(pos + 1, 1);
}
return token;
}
} // namespace web
} // namespace ola
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