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// @file str.h
/* Copyright 2010 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.
*/
#pragma once
/**
* String utilities.
*
* TODO: De-inline.
* TODO: Retire the mongoutils namespace, and move str under the mongo namespace.
*/
#include <string>
#include <sstream>
#include "mongo/bson/util/builder.h"
namespace mongoutils {
namespace str {
/** the idea here is to make one liners easy. e.g.:
return str::stream() << 1 << ' ' << 2;
since the following doesn't work:
(std::stringstream() << 1).str();
*/
class stream {
public:
mongo::StringBuilder ss;
template <class T>
stream& operator<<(const T& v) {
ss << v;
return *this;
}
operator std::string() const {
return ss.str();
}
};
inline bool startsWith(const char* str, const char* prefix) {
const char* s = str;
const char* p = prefix;
while (*p) {
if (*p != *s)
return false;
p++;
s++;
}
return true;
}
inline bool startsWith(const std::string& s, const std::string& p) {
return startsWith(s.c_str(), p.c_str());
}
// while these are trivial today use in case we do different wide char things later
inline bool startsWith(const char* p, char ch) {
return *p == ch;
}
inline bool startsWith(const std::string& s, char ch) {
return startsWith(s.c_str(), ch);
}
inline bool endsWith(const std::string& s, const std::string& p) {
int l = p.size();
int x = s.size();
if (x < l)
return false;
return strncmp(s.c_str() + x - l, p.c_str(), l) == 0;
}
inline bool endsWith(const char* s, char p) {
size_t len = strlen(s);
return len && s[len - 1] == p;
}
inline bool endsWith(const char* p, const char* suffix) {
size_t a = strlen(p);
size_t b = strlen(suffix);
if (b > a)
return false;
return strcmp(p + a - b, suffix) == 0;
}
inline bool equals(const char* a, const char* b) {
return strcmp(a, b) == 0;
}
/** find char x, and return rest of std::string thereafter, or "" if not found */
inline const char* after(const char* s, char x) {
const char* p = strchr(s, x);
return (p != 0) ? p + 1 : "";
}
inline std::string after(const std::string& s, char x) {
const char* p = strchr(s.c_str(), x);
return (p != 0) ? std::string(p + 1) : "";
}
/** find std::string x, and return rest of std::string thereafter, or "" if not found */
inline const char* after(const char* s, const char* x) {
const char* p = strstr(s, x);
return (p != 0) ? p + strlen(x) : "";
}
inline std::string after(const std::string& s, const std::string& x) {
const char* p = strstr(s.c_str(), x.c_str());
return (p != 0) ? std::string(p + x.size()) : "";
}
/** @return true if s contains x
* These should not be used with strings containing NUL bytes
*/
inline bool contains(const std::string& s, const std::string& x) {
return strstr(s.c_str(), x.c_str()) != 0;
}
inline bool contains(const std::string& s, char x) {
verify(x != '\0'); // this expects c-strings so don't use when looking for NUL bytes
return strchr(s.c_str(), x) != 0;
}
/** @return everything before the character x, else entire std::string */
inline std::string before(const std::string& s, char x) {
const char* p = strchr(s.c_str(), x);
return (p != 0) ? s.substr(0, p - s.c_str()) : s;
}
/** @return everything before the std::string x, else entire std::string */
inline std::string before(const std::string& s, const std::string& x) {
const char* p = strstr(s.c_str(), x.c_str());
return (p != 0) ? s.substr(0, p - s.c_str()) : s;
}
/** check if if strings share a common starting prefix
@return offset of divergence (or length if equal). 0=nothing in common. */
inline int shareCommonPrefix(const char* p, const char* q) {
int ofs = 0;
while (1) {
if (*p == 0 || *q == 0)
break;
if (*p != *q)
break;
p++;
q++;
ofs++;
}
return ofs;
}
inline int shareCommonPrefix(const std::string& a, const std::string& b) {
return shareCommonPrefix(a.c_str(), b.c_str());
}
/** std::string to unsigned. zero if not a number. can end with non-num chars */
inline unsigned toUnsigned(const std::string& a) {
unsigned x = 0;
const char* p = a.c_str();
while (1) {
if (!isdigit(*p))
break;
x = x * 10 + (*p - '0');
p++;
}
return x;
}
/** split a std::string on a specific char. We don't split N times, just once
on the first occurrence. If char not present entire std::string is in L
and R is empty.
@return true if char found
*/
inline bool splitOn(const std::string& s, char c, std::string& L, std::string& R) {
const char* start = s.c_str();
const char* p = strchr(start, c);
if (p == 0) {
L = s;
R.clear();
return false;
}
L = std::string(start, p - start);
R = std::string(p + 1);
return true;
}
/** split scanning reverse direction. Splits ONCE ONLY. */
inline bool rSplitOn(const std::string& s, char c, std::string& L, std::string& R) {
const char* start = s.c_str();
const char* p = strrchr(start, c);
if (p == 0) {
L = s;
R.clear();
return false;
}
L = std::string(start, p - start);
R = std::string(p + 1);
return true;
}
/** @return number of occurrences of c in s */
inline unsigned count(const std::string& s, char c) {
unsigned n = 0;
for (unsigned i = 0; i < s.size(); i++)
if (s[i] == c)
n++;
return n;
}
/** trim leading spaces. spaces only, not tabs etc. */
inline std::string ltrim(const std::string& s) {
const char* p = s.c_str();
while (*p == ' ')
p++;
return p;
}
} // namespace str
} // namespace mongoutils
namespace mongo {
using namespace mongoutils;
#if defined(_WIN32)
inline int strcasecmp(const char* s1, const char* s2) {
return _stricmp(s1, s2);
}
#endif
} // namespace mongo
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