std::string Interpreter::RunCommand(const std::string & in_src) {
std::string in = in_src;
std::vector<std::string> args;
// compute any evaluator blocks in full
in = ReduceEvaluators(in_src);
Chain str = in;
std::string command = str.GetLink();
// the help keyword is special.
// if it is the first token in the command
// after evaluation, it will treat the following
// argument as the command to request help for
if (command == "help") {
str++;
std::string helpPage = str.GetLink();
auto helpCmd = commands.find(helpPage.c_str());
if (helpCmd == commands.end() || !helpPage.size()) {
Chain c = "";
if (helpPage.size())
c << "\"" << helpPage.c_str() << "\" does not exist as a command.\n";
c << "Here are the list of available commands:\n";
auto listIter = commands.begin();
while(listIter != commands.end()) {
c << " " << (listIter++)->first.c_str() << "\n";
}
return c;
}
return (Chain() << helpPage << ": " << helpCmd->second->Help() << "\n");
}
auto iter = commands.find(command.c_str());
if (iter == commands.end()) {
return (Chain() << "Unknown command \"" << in << "\"");
}
// parse arguments
while(str.LinksLeft()) {
if (str.GetLink()[0] != '"') {
// normal arg
args.push_back(str.GetLink().c_str()); str++;
} else {
// double quote arg
Chain compoundArg;
int iter = str.GetLinkPos();
iter++;
while(str.ToString()[iter] != '"' && iter < str.ToString().size()) {
compoundArg<<str.ToString()[iter];
iter++;
}
if (!(iter < str.ToString().size() &&
str.ToString()[iter] == '"' &&
iter != str.GetLinkPos())) {
return "Missing compound argument terminator \"...";
}
// push in arg minus quotes
args.push_back(compoundArg);
str = str.ToString().substr(iter+1, str.ToString().size()-1);
}
}
return (*(iter->second))(args);
}
