Gabriele Cosmo
107 lines
2.9 KiB
Plaintext
107 lines
2.9 KiB
Plaintext
// Copyright (C) 2010, Guy Barrand. All rights reserved.
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// See the file tools.license for terms.
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#ifndef tools_smatch
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#define tools_smatch
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#include "words"
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#include <cstring>
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namespace tools {
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inline bool match(const std::string& a_string,const std::string& a_pattern,bool a_check_for_wilds = true){
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std::string::size_type lpattern = a_pattern.length();
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std::string::size_type lstring = a_string.length();
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if ((lpattern==0)&&(lstring==0)) return true;
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if ((lpattern==0)&&(lstring!=0)) return true;
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if ((lpattern!=0)&&(lstring==0)) return false;
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if((lpattern==1)&&(a_pattern[0]=='*')) return true;
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if(a_check_for_wilds) {
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bool some_star = false;
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for(std::string::size_type count=0;count<lpattern;count++) {
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if(a_pattern[count]=='*') {some_star = true;break;}
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}
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if(!some_star) { // no wildcard :
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return (a_pattern==a_string ? true : false );
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}
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}
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// complex pattern :
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//std::string::size_type* wps = new std::string::size_type[2*lpattern];
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if((2*lpattern)>1024) return false; //throw
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std::string::size_type wps[1024]; //OPTIMIZATION : we gain a lot with that.
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unsigned int wn;
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std::string::size_type* wls = wps+lpattern;
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words(a_pattern,"*",false,wn,wps,wls);
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if(!wn) {
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//delete [] wps;
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return true; // only wildcards :
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}
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// tricky case :
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char* token = (char*)a_string.c_str();
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{for(unsigned int count=0;count<wn;count++) {
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size_t lword = wls[count];
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if(!lword) continue;//should never happen !
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//WARNING : ws_pos does not have a null char at ws_pos+lword !
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char* ws_pos = (char*)(a_pattern.c_str()+wps[count]);
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if(count==0) {
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if(a_pattern[0]!='*') {
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// Begin of pattern (ws[0]) and a_string must match :
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if(::strncmp(token,ws_pos,lword)) {
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//delete [] wps;
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return false;
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}
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token = token + lword;
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continue;
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}
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}
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char old_char = *(ws_pos+lword);
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*(ws_pos+lword) = 0;
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char* pos = ::strstr(token,ws_pos);
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*(ws_pos+lword) = old_char;
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if(!pos) {
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//delete [] wps;
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return false;
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}
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if((count==(wn-1)) && (a_pattern[lpattern-1]!='*') ) { // Last word.
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// Compare last word and end of a_string.
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if(::strncmp(a_string.c_str()+lstring-lword,ws_pos,lword)) {
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//delete [] wps;
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return false;
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}
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break;
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} else {
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token = pos + lword;
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}
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}}
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//delete [] wps;
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return true;
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}
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//for tools/app/find.cpp :
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inline bool match2(const std::string& a_string,const std::string& a_pattern){
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return match(a_string,a_pattern,true);
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}
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inline void filter(std::vector<std::string>& a_v,
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const std::string& a_pattern,
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bool a_check_for_wilds = true){
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std::vector<std::string>::iterator it;
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for(it=a_v.begin();it!=a_v.end();) {
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if(match(*it,a_pattern,a_check_for_wilds)) {
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it++;
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} else {
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it = a_v.erase(it);
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}
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}
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}
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}
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#endif
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