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recoded array handling

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eneller
2020-08-13 00:17:32 +02:00
parent e6f12cef97
commit 57d54e9916
1 changed files with 397 additions and 504 deletions
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GdBShell.java
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@@ -1,332 +1,228 @@
import static cTools.KernelWrapper.*; //imports a Java Wrapper for C kernel functions, needs the sourced source_me
import java.util.ArrayList;
import java.util.Scanner;
import java.lang.*;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException; import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays; import java.util.Arrays;
import java.nio.charset.StandardCharsets; import java.util.Scanner;
import static cTools.KernelWrapper.*;
//TODO find why some calls dont terminate
//TODO switch case for printcolor
//TODO clean up ugly array handling that accounts for most of the lines
//TODO remove stringbuilders/buffers because they are unnecessary //TODO remove stringbuilders/buffers because they are unnecessary
//TODO implement auto source? //TODO implement auto source?
public class main{ public class main {
public static void main(String[] args){ public static void main(String[] args) {
System.out.println("Welcome!");
String shellPrefix = "EN@GdBShell:";//print actual user instead of EN??
int runningInt = 0;
Scanner scn = new Scanner(System.in);
while (true){
parseInput(getInput(runningInt,shellPrefix, scn));
runningInt++;
}
}
static String[] getInput(int runningInt, String shellPrefix, Scanner scn){
String directoryPath = System.getProperty("user.dir");
String[] directoryArray = directoryPath.split("/");
StringBuffer buffer = new StringBuffer("~");
//gets rid of the home/user directory and builds a string
for (int i=3;(i<directoryArray.length);i++){
buffer.append("/");
buffer.append(directoryArray[i]);
}
System.out.print("("+runningInt+")");
printColor(shellPrefix,"purple",false);
printColor(buffer.toString()+"$ ","cyan",false);
String input= scn.nextLine();//get input
String[] inputArray = input.split(" ");
//get rid of spaces and tabs
int countInputs = 0;
int[] countArray = new int[inputArray.length];
//count all inputs that actually contain something and put them in a new array in the second for loop
for (int i =0;i< inputArray.length;i++){
if (inputArray[i].equals(" ")||inputArray[i].equals(" ")||inputArray[i].equals("")){
;
}
else{
countArray[countInputs]=i;
countInputs++;
}
}
//System.out.println(Arrays.toString(countArray));
String[] returnArray = new String[countInputs];
for (int i=0; i<countInputs;i++){
returnArray[i]= inputArray[(countArray[i])];
}
return returnArray;
//return replaceCat(returnArray);
}
static void parseInput(String[] inputArray){
//System.out.println(inputArray.length + Arrays.toString(inputArray));
//check for empty inputs
if (inputArray.length<=1){
if(inputArray.length==0){return;}
if(inputArray[0].equals(" ")){return;}
if(inputArray[0].equals(" ")){return;}
}
//implements the exit terminal function
if (inputArray[0].equals("exit")){
if (inputArray.length==1){
printColor("Session ended by user","red",true);
System.exit(0);
}
else{
printColor( "\"exit\" doesn't take parameters. It will end this current shell. Did you try to find a different executable?","red",true);
return;
}
}
System.out.println("Welcome!");
String shellPrefix = "EN@GdBShell:";//print actual user instead of EN??
int runningInt = 0;
Scanner scn = new Scanner(System.in);
while (true) {
//find concats with && in input and execute only if previous command was successful parseInput(getInput(runningInt, shellPrefix, scn));
ArrayList<Integer> concatPosition = new ArrayList<Integer>(); runningInt++;
//save the positions of concats }
for (int i=0; i<inputArray.length;i++){
if(inputArray[i].equals("&&")){
concatPosition.add(i);
}
}
/*
//for testing***************, prints the positions of the concats
for (int i=0;i<concatPosition.size();i++){
printColor(Integer.toString(concatPosition.get(i))+" ","yellow",false);
}
//**************************
*/
//if there are any concats
if(concatPosition.size()>0){
//split the inputArray into singular commands that were separated by &&
ArrayList<ArrayList<String>> commandsList = new ArrayList<ArrayList<String>>();
for (int i=0;i<concatPosition.size()+1;i++){
commandsList.add( new ArrayList<String>());
}
//upper Arraylist used with fixed size, doesnt throw warning like using an array would
//because one concat splits the input into two parts --->+1
//iterate over every command except last, because no concat comes after the last one
int prevConcatPos=0;
for (int i=0;i<concatPosition.size();i++){
for(int j=prevConcatPos;j<concatPosition.get(i);j++){
(commandsList.get(i)).add(inputArray[j]);
}
prevConcatPos=concatPosition.get(i)+1;
}
//add last command
for (int i=concatPosition.get(concatPosition.size()-1)+1;i<inputArray.length;i++){
(commandsList.get(commandsList.size()-1)).add(inputArray[i]);
}
//execute commands in commandsList if previous command was successful, ie terminated with code 0
int returnValue = 0;
for(int i=0;i<commandsList.size();i++){
//if previous command successful
if (returnValue==0){
//build array from arraylist that contains command
String[] command = new String[commandsList.get(i).size()];
for (int j=0;j<command.length;j++){
command[j]= commandsList.get(i).get(j);
}
//execute command and save return value
returnValue = parseRedirect(command);
}
//if it wasnt successful
else{
//build command as string that wasnt succcessful
int failedCommandNumber = i-1;
StringBuffer buffer = new StringBuffer();
for (int j=0;j<commandsList.get(failedCommandNumber).size();j++){
buffer.append(commandsList.get(failedCommandNumber).get(j));
}
printColor("Stopped concatenation at command number "+ failedCommandNumber +" \""+buffer.toString()+"\"","red",true);
if(returnValue==Integer.MIN_VALUE){
printColor("Couldn't find executable assigned to \""+ commandsList.get(failedCommandNumber).get(0)+"\"","red",true);
}
else{
printColor("Exited with error code "+returnValue,"red",true);
}
break;
}
}
} static String[] getInput(int runningInt, String shellPrefix, Scanner scn) {
}
// if its only one command without concats String directoryPath = System.getProperty("user.dir");
else{ String[] directoryArray = directoryPath.split("/");
int returnValue = parseRedirect(inputArray); StringBuffer buffer = new StringBuffer("~");
if (returnValue==0){
printColor("Process exited without error","green",true);
}
else{
if(returnValue == Integer.MIN_VALUE){
printColor("Couldn't find executable assigned to \""+ inputArray[0]+"\"","red",true);
}
else{
printColor("Process exited with code "+ returnValue,"red",true);
}
}
}
return;//TODO clean up error messages
}
static int parseRedirect(String[] inputArray){//should take pipe and read/write,, add >> for append?
//find last occurrences of < and > //gets rid of the home/user directory and builds a string
int redirectInPos = -1; for (int i = 3; (i < directoryArray.length); i++) {
int redirectOutPos = -1; buffer.append("/");
boolean setFirstBool = true; buffer.append(directoryArray[i]);
int firstPos = inputArray.length; }
for(int i=0;i< inputArray.length;i++){ System.out.print("(" + runningInt + ")");
if(inputArray[i].equals("<")){ printColor(shellPrefix, "purple", false);
redirectInPos = i; printColor(buffer.toString() + "$ ", "cyan", false);
if(setFirstBool){
firstPos=i; String input = scn.nextLine();//get input
setFirstBool = false;
} String[] inputArray = input.split("\\s+");//split at whitespace characters such as tabs and spaces
}
if(inputArray[i].equals(">")){
redirectOutPos = i; return inputArray;
if(setFirstBool){
firstPos=i; }
setFirstBool = false;
} static void parseInput(String[] inputArray) {
}
//check for empty inputs
if (inputArray.length == 0) {
return;
}
//implements the exit terminal function
if (inputArray[0].equals("exit")) {
if (inputArray.length == 1) {
printColor("Session ended by user", "red", true);
System.exit(0);
} else {
printColor("\"exit\" doesn't take parameters. It will end this current shell. Did you try to find a different executable?", "red", true);
return;
}
}
String[][] commandsArr = splitArray(inputArray, "&&");
int prevValue;//saves the return code of the previously executed command
int i = 0;//allows to save the command position
//execute single commands here
prevValue = parseRedirect(commandsArr[i]);
i = 1;
boolean singleCommand = true;
//execute possible concatenations
for (; i < commandsArr.length; i++) {
singleCommand = false;
//execute if previous command was successful, else do error printing
if (prevValue == 0) {
printColor("Process exited without error", "green", true);
prevValue = parseRedirect(commandsArr[i]);
} else {
break;
}
}
if (prevValue == 0) {
printColor("Process exited without error", "green", true);
} else {
if (singleCommand == false) {
printColor("Stopped concatenation at command number " + (i - 1) + " \"" + String.join(" ", commandsArr[i - 1]) + "\":", "red", true);
}
switch (prevValue) {
//TODO add the internal error codes to print useful messages
case Integer.MIN_VALUE + 1://from execute()
printColor("Entered empty command", "red", true);
break;
case Integer.MIN_VALUE://from execute
printColor("Couldn't find executable assigned to \"" + commandsArr[i - 1][0] + "\"", "red", true);
break;
default:
printColor("Exited with error code " + prevValue, "red", true);//everything else
}
}
return;
}
static int parseRedirect(String[] inputArray) {//should take pipe and read/write,, add >> for append?
//find last occurrences of < and >
int redirectInPos = -1;
int redirectOutPos = -1;
boolean setFirstBool = true;
int firstPos = inputArray.length;
for (int i = 0; i < inputArray.length; i++) {
if (inputArray[i].equals("<")) {
redirectInPos = i;
if (setFirstBool) {
firstPos = i;
setFirstBool = false;
}
}
if (inputArray[i].equals(">")) {
redirectOutPos = i;
if (setFirstBool) {
firstPos = i;
setFirstBool = false;
}
}
/*if(inputArray[i].equals(">>")){ /*if(inputArray[i].equals(">>")){
appendOutPos = i; appendOutPos = i;
}*/ }*/
} }
int fd_in=-1;
if(redirectInPos!=-1){
if(checkls(inputArray[redirectInPos+1])){
fd_in = open(inputArray[redirectInPos+1],O_RDONLY);
}
else{return -10;}//throw error because invalid input file
}
int fd_out=-1;
if(redirectOutPos!=-1){
fd_out = open(inputArray[redirectOutPos+1],O_WRONLY|O_CREAT|O_TRUNC);//create file if non existent, overwrite if it is
}
String[] commands = new String[firstPos];
for (int i=0;i< commands.length;i++){
commands[i]=inputArray[i];
}
int returnValue= parsePipe(commands,fd_in,fd_out);
if(fd_in!=-1){
close(fd_in);
}
if(fd_out!= -1){
close(fd_out);
}
return returnValue;
}
static int parsePipe(String[] inputArray,int fd_in, int fd_out){
int returnValue = -5;
ArrayList<Integer> pipePos = new ArrayList<Integer>();
int count =0;
for (int i =0;i< inputArray.length; i++){
if (inputArray[i].equals("|")){
pipePos.add(count);
count=0;
}
else{count++;}
}
pipePos.add(count);
//populate array of commands separated by |
String[][] commands = new String[pipePos.size()][];
int prevPipePos = 0;
for (int i=0;i< pipePos.size();i++){
commands[i] = new String[pipePos.get(i)];
for (int j=0;j<commands[i].length;j++){
commands[i][j]=inputArray[j+prevPipePos];
}
prevPipePos = prevPipePos + pipePos.get(i)+1;
}
//execute commands
//first command gets stdin
int lastIn = -1;
int[] pipefd = new int[2];
if(commands.length>1){
pipe(pipefd);
returnValue= execute(commands[0],fd_in,pipefd[1]);
for(int i=1;i<commands.length-1;i++){
returnValue = execute(commands[i],pipefd[0],pipefd[1]);
}
lastIn = pipefd[0];
System.err.println("here");
}
else{
lastIn = fd_in;
}
// execute last (or only) command
returnValue = execute(commands[commands.length-1],lastIn,fd_out);
//TODO look up error return value of OPEN to separate from no redirect initialized as -1
return returnValue; int fd_in = -1;
} if (redirectInPos != -1) {
if (checkls(inputArray[redirectInPos + 1])) {
fd_in = open(inputArray[redirectInPos + 1], O_RDONLY);
} else {
return -10;
}//throw error because invalid input file
}
int fd_out = -1;
if (redirectOutPos != -1) {
fd_out = open(inputArray[redirectOutPos + 1], O_WRONLY | O_CREAT | O_TRUNC);//overwrite file if exists, create else
}
String[] command = Arrays.copyOfRange(inputArray, 0, firstPos);
static int execute(String[] inputArray,int fd_in, int fd_out){//0 for read, 1 for write int returnValue = parsePipe(command, fd_in, fd_out);
int[] intArray = new int[]{Integer.MIN_VALUE};//to pass to the waitpid function
//split the Array into path and arguments //close potential files
if (fd_in != -1) {
//tries to find the executable at first position of input close(fd_in);
String path = null; }
if (inputArray.length!=0){ if (fd_out != -1) {
close(fd_out);
String input = inputArray[0]; }
return returnValue;
}
static int parsePipe(String[] inputArray, int fd_in, int fd_out) {
String[][] command = splitArray(inputArray, "|");
//execute commands
int returnValue;
//first command gets stdin
int lastIn = -1;
int[] pipefd = new int[2];
if (command.length > 1) {
pipe(pipefd);
returnValue = execute(command[0], fd_in, pipefd[1]);
for (int i = 1; i < command.length - 1; i++) {
returnValue = execute(command[i], pipefd[0], pipefd[1]);
}
lastIn = pipefd[0];
} else {
lastIn = fd_in;
}
// execute last (or only) command
returnValue = execute(command[command.length - 1], lastIn, fd_out);
return returnValue;
}
static int execute(String[] inputArray, int fd_in, int fd_out) {//0 for read, 1 for write
int[] intArray = new int[]{Integer.MIN_VALUE};//to pass to the waitpid function
//split the Array into path and arguments
//tries to find the executable at first position of input
String path = null;
if (inputArray.length > 0) {
String input = inputArray[0];
/* /*
if (input.indexOf("/")>-1){ if (input.indexOf("/")>-1){
if (checkls(input)==true){ if (checkls(input)==true){
@@ -335,250 +231,247 @@ public class main{
} }
} }
else{*/ else{*/
path = which(input); path = which(input);
//} //}
} } else {
else{return Integer.MIN_VALUE+1;}// add error in parseInput for this number return Integer.MIN_VALUE + 1;
}// internal error code
//if path found, compile argslist and start execv
if (isNumeric(path)==false){
printColor("Executing program at "+path,"green",true);
//System.out.println();
//int[] pipeArray = new int[]{0};//sets the pip
int forkInt = fork();// saves the return value because every call will fork the process again
//baby process
if (forkInt==0){
//Array[0] mit rest als parameter ausführen (path, args[])
//read from pipe or write to it
if(fd_in!=-1){
close(0);
dup2(fd_in,0);
}
if(fd_out!=-1){
close(1);
dup2(fd_out,1);
}
//execute the program
execv(path, inputArray);
printColor("execv fatal error","red",true);
exit(0);
}
//papa process
else{
waitpid(forkInt,intArray,0);
//read from pipe HEEERE???
}
}
return intArray[0];
}
//if path found, compile argslist and start execv
public static String which(String arguments){ if (isNumeric(path) == false) {
ProcessBuilder prcBuilder = new ProcessBuilder(); printColor("Executing program at " + path, "green", true);
prcBuilder.command("bash","-c","which "+arguments);
int forkInt = fork();// saves the return value because every call will fork the process again
//baby process
try { if (forkInt == 0) {
//Array[0] mit rest als parameter ausführen (path, args[])
//read from pipe or write to it
if (fd_in != -1) {
close(0);
dup2(fd_in, 0);
}
if (fd_out != -1) {
close(1);
dup2(fd_out, 1);
}
//execute the program
execv(path, inputArray);
printColor("execv fatal error", "red", true);
exit(0);
}
//papa process
else {
waitpid(forkInt, intArray, 0);
}
}
return intArray[0];
}
public static ArrayList<Integer> findArrayOccurrence(Object[] oArr, Object o) {
ArrayList<Integer> aList = new ArrayList<Integer>();
for (int i = 0; i < oArr.length; i++) {
if (oArr[i].equals(o)) {
aList.add(i);
}
}
return aList;
}
public static String[][] splitArray(String[] oArr, String o) {
ArrayList<Integer> aList = findArrayOccurrence(oArr, o);
aList.add(oArr.length);//emulate occurence of split object behind last array element to make handling easier in the for loop
String[][] sArr = new String[aList.size()][];
int prevOcc = 0;
for (int i = 0; i < aList.size(); i++) {
sArr[i] = Arrays.copyOfRange(oArr, prevOcc, aList.get(i));
prevOcc = aList.get(i) + 1;
}
return sArr;
}
public static String which(String arguments) {
ProcessBuilder prcBuilder = new ProcessBuilder();
prcBuilder.command("bash", "-c", "which " + arguments);
try {
Process process = prcBuilder.start(); Process process = prcBuilder.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line =null; String line = null;
StringBuffer buffer = new StringBuffer(); StringBuffer buffer = new StringBuffer();
while ((line=reader.readLine())!=null){ while ((line = reader.readLine()) != null) {
buffer.append(line); buffer.append(line);
} }
String path = buffer.toString(); String path = buffer.toString();
if (path.contains("/")){ if (path.contains("/")) {
return path; return path;
} } else {
int exitCode = process.waitFor();
return Integer.toString(exitCode);
else{ //System.out.println("\nExited with error code : " + exitCode);
int exitCode = process.waitFor();
return Integer.toString(exitCode);
//System.out.println("\nExited with error code : " + exitCode);
} }
} } catch (IOException e) {
catch (IOException e) { printColor("err1", "red", true);
printColor("err1","red",true); //e.toString(); } catch (InterruptedException e) {
} printColor("err2", "red", true);
catch (InterruptedException e) {
printColor("err2","red",true); //e.toString();
} }
return "t"; return "t";
} }
public static boolean checkls(String input){ public static boolean checkls(String input) {
//check what ls does in this program if executed locally
String[] inputArray = input.split("/");
String checkfile = inputArray[inputArray.length-1];
StringBuffer buffer1 = new StringBuffer();
if (input.indexOf("/")==0){
buffer1.append("/");
}
for (int i=0;i<inputArray.length;i++){
buffer1.append(inputArray[i]);
if(i<inputArray.length-1){
buffer1.append("/");
}
}
//System.out.println(buffer1);
ProcessBuilder prcBuilder = new ProcessBuilder(); //check what ls does in this program if executed locally
prcBuilder.command("bash","-c","ls "+buffer1.toString()); String[] inputArray = input.split("/");
String checkfile = inputArray[inputArray.length - 1];
StringBuffer buffer1 = new StringBuffer();
if (input.indexOf("/") == 0) {
buffer1.append("/");
}
for (int i = 0; i < inputArray.length; i++) {
buffer1.append(inputArray[i]);
if (i < inputArray.length - 1) {
buffer1.append("/");
}
}
try { ProcessBuilder prcBuilder = new ProcessBuilder();
prcBuilder.command("bash", "-c", "ls " + buffer1.toString());
try {
Process process = prcBuilder.start(); Process process = prcBuilder.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line =null; String line = null;
StringBuffer buffer2 = new StringBuffer(); StringBuffer buffer2 = new StringBuffer();
while ((line=reader.readLine())!=null){ while ((line = reader.readLine()) != null) {
buffer2.append(line); buffer2.append(line);
buffer2.append(" "); buffer2.append(" ");
} }
String path = buffer2.toString(); String path = buffer2.toString();
//printColor(path,"yellow",true);//for test purposes //printColor(path,"yellow",true);//for test purposes
if (path.contains(checkfile)){ if (path.contains(checkfile)) {
return true; return true;
} } else {
int exitCode = process.waitFor();
return false;
else{ //System.out.println("\nExited with error code : " + exitCode);
int exitCode = process.waitFor();
return false;
//System.out.println("\nExited with error code : " + exitCode);
} }
} } catch (IOException e) {
catch (IOException e) { printColor("err1", "red", true);
printColor("err1","red",true); //e.toString(); } catch (InterruptedException e) {
} printColor("err2", "red", true);
catch (InterruptedException e) {
printColor("err2","red",true); //e.toString();
} }
return false; return false;
} }
public static boolean isNumeric(String toCheck){ public static boolean isNumeric(String toCheck) {
try{ try {
double d = Double.parseDouble(toCheck); double d = Double.parseDouble(toCheck);
} } catch (NumberFormatException nsfw) {
catch(NumberFormatException nsfw){ return false;
return false; } catch (NullPointerException npe) {
} return false;
catch(NullPointerException npe){ }
return false; return true;
}
return true;
} }
static boolean printColor(String text, String colorvar, boolean lineBreak) {// maybe rainbow??
//takes two Strings and one boolean that specify the text to print, the color and if there should be a linebreak (ie print or println)
static boolean printColor(String text, String colorvar, boolean lineBreak){// maybe rainbow?? String ANSI_RESET = "\u001B[0m";
//takes two Strings and one boolean that specify the text to print, the color and if there should be a linebreak (ie print or println) String ANSI_BLACK = "\u001B[30m";
String ANSI_RED = "\u001B[31m";
String ANSI_YELLOW = "\u001B[33m";
String ANSI_BLUE = "\u001B[34m";
String ANSI_PURPLE = "\u001B[35m";
String ANSI_CYAN = "\u001B[36m";
String ANSI_WHITE = "\u001B[37m";
String ANSI_GREEN = "\u001B[32m";
String ANSI_RESET = "\u001B[0m"; boolean returnBool = true;
String ANSI_BLACK = "\u001B[30m"; String color = "";
String ANSI_RED = "\u001B[31m";
String ANSI_YELLOW = "\u001B[33m";
String ANSI_BLUE = "\u001B[34m";
String ANSI_PURPLE = "\u001B[35m";
String ANSI_CYAN = "\u001B[36m";
String ANSI_WHITE = "\u001B[37m";
String ANSI_GREEN = "\u001B[32m";
boolean returnBool= true; switch (colorvar.toLowerCase()) {
String color= ""; case "white":
color = ANSI_WHITE;
break;
case "black":
color = ANSI_BLACK;
break;
case "red":
color = ANSI_RED;
break;
case "yellow":
color = ANSI_YELLOW;
break;
case "blue":
color = ANSI_BLUE;
break;
case "purple":
color = ANSI_PURPLE;
break;
case "cyan":
color = ANSI_CYAN;
break;
case "green":
color = ANSI_GREEN;
break;
switch(colorvar.toLowerCase()){ default:
case "white": returnBool = false;
color = ANSI_WHITE; }
break;
case "black":
color = ANSI_BLACK;
break;
case "red":
color = ANSI_RED;
break;
case "yellow":
color = ANSI_YELLOW;
break;
case "blue":
color = ANSI_BLUE;
break;
case "purple":
color = ANSI_PURPLE;
break;
case "cyan":
color = ANSI_CYAN;
break;
case "green":
color = ANSI_GREEN;
break;
default: returnBool = false;
}
System.out.print(color+text + ANSI_RESET); System.out.print(color + text + ANSI_RESET);
if (lineBreak){ if (lineBreak) {
System.out.println(""); System.out.println();
} }
return returnBool; return returnBool;
} }
static String[] replaceCat(String[] args){//used to integrate custom cat into shell static String[] replaceCat(String[] args) {//used to integrate custom cat into shell
if (args[0].equals("jcat")){ if (args[0].equals("jcat")) {
String[] changed = new String[args.length+1]; String[] changed = new String[args.length + 1];
changed[0]= "java"; changed[0] = "java";
changed[1]= "cat.java"; changed[1] = "cat.java";
for (int i=1;i<args.length;i++){//ignore the "jcat" at first pos for (int i = 1; i < args.length; i++) {//ignore the "jcat" at first pos
changed[i+1]=args[i]; changed[i + 1] = args[i];
} }
return changed; return changed;
} } else {
else{return args;} return args;
}
}
}
} }