//bool secondRun stops the interpreter from recursing more than 1 level into itself
void Interpret(char* cmdLine,bool secondRun)
{
int task = 1;
int bg = 0, i,k,j = 0, quotation1 = 0, quotation2 = 0;
commandT **command;
if(cmdLine[0] == '\0') return;
for(i = 0; i < strlen(cmdLine); i++){
if(cmdLine[i] == '\''){
if(quotation2) continue;
else if(quotation1){
quotation1 = 0;continue;
}
else quotation1 = 1;
}
if(cmdLine[i] == '"'){
if(quotation1) continue;
else if(quotation2){
quotation2 = 0;continue;
}
else quotation2 = 1;
}
if(cmdLine[i] == '|' && quotation1 != 1 && quotation2 != 1){
task ++;
}
}
command = (commandT **) malloc(sizeof(commandT *) * task);
i = strlen(cmdLine) - 1;
while(i >= 0 && cmdLine[i] == ' ') i--;
if(cmdLine[i] == '&'){
if(i == 0) return;
bg = 1;
cmdLine[i] = '\0';
}
quotation1 = quotation2 = 0;
task = 0;
k = strlen(cmdLine);
for(i = 0; i < k; i++, j++){
if(cmdLine[i] == '\''){
if(quotation2) continue;
else if(quotation1){
quotation1 = 0;continue;
}
else quotation1 = 1;
}
if(cmdLine[i] == '"'){
if(quotation1) continue;
else if(quotation2){
quotation2 = 0;continue;
}
else quotation2 = 1;
}
if(cmdLine[i] == '|' && quotation1 != 1 && quotation2 != 1){
parser_single(&(cmdLine[i-j]), j, &(command[task]),bg);
task++;
j = -1;
}
}
parser_single(&(cmdLine[i-j]), j, &(command[task]),bg);
//
// TILDE EXPANSION
//
bool changed = FALSE;
int idx =0;
//look through all the args
while(idx < command[0]->argc){
//special case for "unalias x". ie dont expand x
if(command[0]->argv[idx][0] == '~'){
char* home = getenv("HOME");
//get the part after the tilde and add it to home
strcat(home,(command[0]->argv[idx])+2);
command[0]->argv[idx] = home;
changed = TRUE;
}
idx++;
}
//
// ALIAS
//
//only expand aliases on the first run to stop aliases from recrusively expanding
if(!secondRun){
//look for aliases
int idx =0;
//look through all the args
while(idx < command[0]->argc){
//special case for "unalias x". ie dont expand x
if(strcmp(command[0]->argv[0],"unalias") != 0)
{
if(IsAlias(command[0]->argv[idx])){
(command[0]->argv)[idx] = GetAliasCmd(command[0]->argv[idx]);
changed = TRUE;
//check for tilde expansion
}
}
idx++;
}
//if we expanded something
if(changed){
int newSize = 0;//the new size of the expanded command line
//figure out the new size
int idx2 =0;
while(idx2 < command[0]->argc){
newSize = newSize + strlen(command[0]->argv[idx2]) + 1;
idx2++;
}
//copy all ths args to a new cmdLine string
char newCmdLine[newSize + 1];
strcpy (newCmdLine, command[0]->argv[0]);
int idx3 =1;
while(idx3 < command[0]->argc){
strcat(newCmdLine," ");//add space between args
strcat(newCmdLine,command[0]->argv[idx3]);
idx3++;
}
//rerun the interpreter
Interpret(newCmdLine,TRUE);
}
else{
RunCmd(command, task+1);
free(command);
}
}else{
RunCmd(command, task+1);
free(command);
}
}
/*Parse the whole command line and split commands if a piped command is sent.*/
void Interpret(char* cmdLine)
{
int task = 1;
int bg = 0, i,k,j = 0, quotation1 = 0, quotation2 = 0;
commandT **command;
if(cmdLine[0] == '\0') return;
for(i = 0; i < strlen(cmdLine); i++){
if(cmdLine[i] == '\''){
if(quotation2) continue;
else if(quotation1){
quotation1 = 0;continue;
}
else quotation1 = 1;
}
if(cmdLine[i] == '"'){
if(quotation1) continue;
else if(quotation2){
quotation2 = 0;continue;
}
else quotation2 = 1;
}
if(cmdLine[i] == '|' && quotation1 != 1 && quotation2 != 1){
task ++;
}
}
command = (commandT **) malloc(sizeof(commandT *) * task);
i = strlen(cmdLine) - 1;
while(i >= 0 && cmdLine[i] == ' ') i--;
if(cmdLine[i] == '&'){
if(i == 0) return;
bg = 1;
cmdLine[i] = '\0';
}
quotation1 = quotation2 = 0;
task = 0;
k = strlen(cmdLine);
for(i = 0; i < k; i++, j++){
if(cmdLine[i] == '\''){
if(quotation2) continue;
else if(quotation1){
quotation1 = 0;continue;
}
else quotation1 = 1;
}
if(cmdLine[i] == '"'){
if(quotation1) continue;
else if(quotation2){
quotation2 = 0;continue;
}
else quotation2 = 1;
}
if(cmdLine[i] == '|' && quotation1 != 1 && quotation2 != 1){
parser_single(&(cmdLine[i-j]), j, &(command[task]),bg);
task++;
j = -1;
}
}
parser_single(&(cmdLine[i-j]), j, &(command[task]),bg);
RunCmd(command, task+1);
free(command);
}
