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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
/* Things in the mongoutils namespace
(1) are not database specific, rather, true utilities
(2) are cross platform
(3) may require boost headers, but not libs
(4) are clean and easy to use in any c++ project without pulling in lots of other stuff
Note: within this module, we use int for all offsets -- there are no unsigned offsets
and no size_t's. If you need 3 gigabyte long strings, don't use this module.
*/
#include <string>
#include <sstream>
// this violates the README rules for mongoutils:
#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:
(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 equals( const char * a , const char * b ) { return strcmp( a , b ) == 0; }
/** find char x, and return rest of 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 string x, and return rest of 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 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 string x, else entire 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()); }
/** 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 string on a specific char. We don't split N times, just once
on the first occurrence. If char not present entire 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;
}
/** remove trailing chars in place */
inline void stripTrailing(std::string& s, const char *chars) {
std::string::iterator i = s.end();
while( s.begin() != i ) {
i--;
if( contains(chars, *i) ) {
s.erase(i);
}
}
}
}
}
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