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// stringutils.cpp
/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/stringutils.h"
#include "mongo/util/hex.h"
namespace mongo {
using std::string;
using std::vector;
void splitStringDelim(const string& str, vector<string>* res, char delim) {
if (str.empty())
return;
size_t beg = 0;
size_t pos = str.find(delim);
while (pos != string::npos) {
res->push_back(str.substr(beg, pos - beg));
beg = ++pos;
pos = str.find(delim, beg);
}
res->push_back(str.substr(beg));
}
void joinStringDelim(const vector<string>& strs, string* res, char delim) {
for (vector<string>::const_iterator it = strs.begin(); it != strs.end(); ++it) {
if (it != strs.begin())
res->push_back(delim);
res->append(*it);
}
}
LexNumCmp::LexNumCmp(bool lexOnly) : _lexOnly(lexOnly) {}
int LexNumCmp::cmp(StringData sd1, StringData sd2, bool lexOnly) {
bool startWord = true;
size_t s1 = 0;
size_t s2 = 0;
while (s1 < sd1.size() && s2 < sd2.size()) {
bool d1 = (sd1[s1] == '.');
bool d2 = (sd2[s2] == '.');
if (d1 && !d2)
return -1;
if (d2 && !d1)
return 1;
if (d1 && d2) {
++s1;
++s2;
startWord = true;
continue;
}
bool p1 = (sd1[s1] == (char)255);
bool p2 = (sd2[s2] == (char)255);
if (p1 && !p2)
return 1;
if (p2 && !p1)
return -1;
if (!lexOnly) {
bool n1 = isdigit(sd1[s1]);
bool n2 = isdigit(sd2[s2]);
if (n1 && n2) {
// get rid of leading 0s
if (startWord) {
while (s1 < sd1.size() && sd1[s1] == '0')
s1++;
while (s2 < sd2.size() && sd2[s2] == '0')
s2++;
}
size_t e1 = s1;
size_t e2 = s2;
while (e1 < sd1.size() && isdigit(sd1[e1]))
e1++;
while (e2 < sd2.size() && isdigit(sd2[e2]))
e2++;
size_t len1 = e1 - s1;
size_t len2 = e2 - s2;
int result;
// if one is longer than the other, return
if (len1 > len2) {
return 1;
} else if (len2 > len1) {
return -1;
}
// if the lengths are equal, just strcmp
else {
result = strncmp(sd1.rawData() + s1, sd2.rawData() + s2, len1);
if (result)
return (result > 0) ? 1 : -1;
}
// otherwise, the numbers are equal
s1 = e1;
s2 = e2;
startWord = false;
continue;
}
if (n1)
return 1;
if (n2)
return -1;
}
if (sd1[s1] > sd2[s2])
return 1;
if (sd2[s2] > sd1[s1])
return -1;
s1++;
s2++;
startWord = false;
}
if (s1 < sd1.size() && sd1[s1])
return 1;
if (s2 < sd2.size() && sd2[s2])
return -1;
return 0;
}
int LexNumCmp::cmp(StringData s1, StringData s2) const {
return cmp(s1, s2, _lexOnly);
}
bool LexNumCmp::operator()(StringData s1, StringData s2) const {
return cmp(s1, s2) < 0;
}
int versionCmp(const StringData rhs, const StringData lhs) {
if (rhs == lhs)
return 0;
// handle "1.2.3-" and "1.2.3-pre"
if (rhs.size() < lhs.size()) {
if (strncmp(rhs.rawData(), lhs.rawData(), rhs.size()) == 0 && lhs[rhs.size()] == '-')
return +1;
} else if (rhs.size() > lhs.size()) {
if (strncmp(rhs.rawData(), lhs.rawData(), lhs.size()) == 0 && rhs[lhs.size()] == '-')
return -1;
}
return LexNumCmp::cmp(rhs, lhs, false);
}
std::string escape(StringData sd, bool escape_slash) {
StringBuilder ret;
ret.reset(sd.size());
for (const auto& c : sd) {
switch (c) {
case '"':
ret << "\\\"";
break;
case '\\':
ret << "\\\\";
break;
case '/':
ret << (escape_slash ? "\\/" : "/");
break;
case '\b':
ret << "\\b";
break;
case '\f':
ret << "\\f";
break;
case '\n':
ret << "\\n";
break;
case '\r':
ret << "\\r";
break;
case '\t':
ret << "\\t";
break;
default:
if (c >= 0 && c <= 0x1f) {
// For c < 0x7f, ASCII value == Unicode code point.
ret << "\\u00" << toHexLower(&c, 1);
} else {
ret << c;
}
}
}
return ret.str();
}
} // namespace mongo
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