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Make inputparser more robust + add minimize

This commit is contained in:
Thomas Ave 2016-05-27 00:15:06 +02:00
parent a4dbf3d195
commit 81f3c022c8
1 changed files with 32 additions and 5 deletions
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37
src/inputparser.cpp
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@ -12,24 +12,51 @@ namespace lxs {
auto enfavect = parseLines(is);
auto enfas = linesToEnfa(enfavect);
auto enfa = merge(enfas);
auto dfa = mssc(enfa);
auto dfa = minimize(mssc(enfa));
return dfa;
}
std::vector<std::pair<std::string,std::string> > InputParser::parseLines(std::istream &is) {
std::string line;
std::vector<std::pair<std::string,std::string> > result;
unsigned int i=0;
while(std::getline(is,line)) {
int loc = line.find_first_of('=');
int start = line.find_first_not_of(" \t\v\f\r");
if(line.length() == 0) continue;
i++;
std::size_t loc = line.find_first_of('=');
if(loc == std::string::npos) {
std::cerr << "Invalid syntax on line " << i << ": no '=' found!" << std::endl;
exit(1);
}
size_t start = line.find_first_not_of(" \t\v\f\r");
if(start == loc) {
std::cerr << "Invalid syntax on line " << i << ": no valid tokenname specified!" << std::endl;
exit(1);
}
std::string tokenname = line.substr(start, loc);
int end = tokenname.find_last_not_of(" \t\v\f\r");
if(tokenname.length() == 0) {
std::cerr << "Invalid syntax on line " << i << ": no valid tokenname specified!" << std::endl;
exit(1);
}
std::size_t end = tokenname.find_last_not_of(" \t\v\f\r");
tokenname = tokenname.substr(0,end + 1);
std::string regex = line.substr(loc+1);
start = regex.find_first_not_of(" ");
if(regex.length() == 0) {
std::cerr << "Invalid syntax on line " << i << ": no valid regex specified!" << std::endl;
exit(1);
}
start = regex.find_first_not_of(" \t\v\f\r");
if(start == std::string::npos) {
std::cerr << "Invalid syntax on line " << i << ": no valid regex specified!" << std::endl;
exit(1);
}
regex = regex.substr(start);
result.push_back(std::make_pair(tokenname,regex));
}
if(result.size() == 0) {
std::cerr << "No valid rules found in the input file!" << std::endl;
exit(1);
}
return result;
}