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// stringutils.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongo/pch.h"
#include "mongo/util/stringutils.h"
namespace mongo {
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( const StringData& sd1, const 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;
}
// 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( const StringData& s1, const StringData& s2 ) const {
return cmp( s1, s2, _lexOnly );
}
bool LexNumCmp::operator()( const StringData& s1, const 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);
}
} // namespace mongo
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