#include

#include

std::vector parseCommandLine$($const std::string& aCommandLine$)\{$

std::cout $<<"$ in$2"<<$ std::endl;

std::vector tokens;

size$\_$t start $=0$;

while $($start $<$ aCommandLine.size$())\{$

size$\_$t end $=$ start;

while $($end $<$ aCommandLine.size$()$ &&

aCommandLine$[$end$]!=\text{'}\text{'}$ &&

aCommandLine$[$end$]!=\text{'}<\text{'}$ &&

aCommandLine$[$end$]!=\text{'}>\text{'}$ &&

aCommandLine$[$end$]!=\text{'}|\text{'})\{$

$++$end;

$\}$

std::string token $=$ aCommandLine.substr$($start$,$ end $-$ start$)$;

$//$ Handle file redirection with $\text{'}<\text{'}$ and $\text{'}>\text{'}$

if $(!$token.empty$()$ && $($token$.$back$()==\text{'}<\text{'}||$ token.back$()==\text{'}>\text{'}))\{$

tokens.push$\_$back$($token$.$substr$(0,$ token.size$()-1))$;

tokens.push$\_$back$($std::string$(1,$ token.back$()))$;

$\}$

$//$ Handle file redirection with $\text{'}<<\text{'}$

else if $($token $=="<<"$ && start $==0)\{$

tokens.push$\_$back$($token$)$;

$\}$

$//$ Handle pipe $\text{'}|\text{'}$

else if $($token $=="|")\{$

tokens.push$\_$back$($token$)$;

$\}$

$//$ Handle other tokens

else if $(!$token.empty$())\{$

tokens.push$\_$back$($token$)$;

$\}$

$//$ Move to the next non$-$whitespace character

while $($end $<$ aCommandLine.size$()$ && aCommandLine$[$end$]==\text{'}\text{'})\{$

$++$end;

$\}$

start $=$ end;

$\}$

std::cout $<<"$ finished" $<<$ std::endl;

return tokens;

$\}$

int main$()\{$

std::cout $<<"$ in$"<<$ std::endl;

std::string commandLine $=$ "grep x $<$ myfile.textbfin $>$ myfile.out";

std::cout $<<"0$ut $1"<<$ std::endl;

std::vector result $=$ parseCommandLine$($commandLine$)$;

std::cout $<<"0$ut$2"<<$ std::endl;

$//$ Print the parsed tokens

for $($size$\_$t i $=0$; i $<$ result.size$()$; $++$i$)\{$

std::cout $<<$ "Token $"<<$ i $+1<<"$: $"<<$ result$[$i$]<<$ std::endl;

$\}$

return $0$;

$\}$