msh-console/msh-console-library/command.cpp

/**
    MIT License

    Copyright (c) 2016 Claudio Maggioni

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
*/

#include "shell.h"
namespace mshconsole {

    Command::Command(const std::string& n, int (*funcptr)(CommandExecutor* whoExecuted,const Datas& data, const std::vector<const char*> argv)) :
        name(n), funcCommand(funcptr), optionNum(0){
        checkObj();
    }

    void Command::addOption(const poptOption& a){
        if(a.arg!=NULL&&a.arg!=nullptr&&a.arg!=0) throw InvalidOptionException{};
        for(int i=0; i<opts.size(); i++)
            if(strcmp((opts[i].longName),(a.longName))==0||
               opts[i].shortName==a.shortName)
                throw DuplicatedOptionException();
        opts.push_back(a);
        optionNum++;
    }

    int Command::execute(const struct Params& p, CommandExecutor* c, std::ostream& errorStream){
        if(p.argc<=0) return -1;

        // options a, b, c take integer arguments
        // options f and g take no arguments
        poptContext pc;
        opts.push_back(POPT_TERMINATOR);

        Datas datas;
        for(int i=0; i<optionNum; i++){
            Data* tmp = new Data(&opts[i]);
            opts[i].arg=&(tmp->d);
            datas.push_back(tmp);
        }

        // pc is the context for all popt-related functions
        pc = poptGetContext(NULL, p.argc, const_cast<const char**>(p.argv), opts.data(), 0);
        poptSetOtherOptionHelp(pc, "[ARG...]");
        if (p.argc < 2 && opts.size()==0) {
            poptPrintUsage(pc, stderr, 0);
            return 1;
        }

        // process options and handle each val returned
        int val;
        while ((val = poptGetNextOpt(pc)) >= 0);

        // poptGetNextOpt returns -1 when the final argument has been parsed
        // otherwise an error occured
        if (val != -1) {
            errorStream << name << ": ";
            switch(val) {
            case POPT_ERROR_NOARG:
                errorStream << "argument missing for an option\n";
                return 1;
            case POPT_ERROR_BADOPT:
                errorStream << "option not found\n";
                return 1;
            case POPT_ERROR_BADNUMBER:
            case POPT_ERROR_OVERFLOW:
                errorStream << "option could not be converted to number\n";
                return 1;
            default:
                errorStream << "unknown error in option processing\n";
                return 1;
            }
        }

        std::vector<const char*> nonOptionArgs;
        while (poptPeekArg(pc) != NULL)
            nonOptionArgs.push_back(const_cast<const char*>(poptGetArg(pc)));

        return (*funcCommand)(c,datas,nonOptionArgs);
    }

    const std::string& Command::getName(){
        return this->name;
    }

    Command::Command(const Command& old) : name(old.name) , funcCommand(old.funcCommand){
        checkObj();
    }

    void Command::checkObj(){
        for(unsigned int i=0; i<name.length(); i++){
            if(!((name[i]>'a'&&name[i]<'z')||(name[i]>'A'&&name[i]<'Z'))){
                throw CommandNameNotValidException();
            }
        }
    }
    const struct poptOption Command::POPT_TERMINATOR = {NULL,'\0',POPT_ARG_NONE,NULL,-1,NULL,NULL};
}