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Execute CopyPasta Language: Difference between revisions
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Line 177:
$ ./copypasta prog3.cp
Unknown command, Goto
</pre>
=={{header|Java}}==
<lang Java>import java.io.File;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Arrays;
public class Copypasta
{
// a function to handle fatal errors
public static void fatal_error(String errtext)
{
StackTraceElement[] stack = Thread.currentThread().getStackTrace();
StackTraceElement main = stack[stack.length - 1];
String mainClass = main.getClassName();
System.out.println("%" + errtext);
System.out.println("usage: " + mainClass + " [filename.cp]");
System.exit(1);
}
public static void main(String[] args)
{
// get a filename from the command line and read the file in
String fname = null;
String source = null;
try
{
fname = args[0];
source = new String(Files.readAllBytes(new File(fname).toPath()));
}
catch(Exception e)
{
fatal_error("error while trying to read from specified file");
}
// convert the source to lines of code
ArrayList<String> lines = new ArrayList<String>(Arrays.asList(source.split("\n")));
// a variable to represent the 'clipboard'
String clipboard = "";
// loop over the lines that were read
int loc = 0;
while(loc < lines.size())
{
// check which command is on this line
String command = lines.get(loc).trim();
try
{
if(command.equals("Copy"))
clipboard += lines.get(loc + 1);
else if(command.equals("CopyFile"))
{
if(lines.get(loc + 1).equals("TheF*ckingCode"))
clipboard += source;
else
{
String filetext = new String(Files.readAllBytes(new File(lines.get(loc + 1)).toPath()));
clipboard += filetext;
}
}
else if(command.equals("Duplicate"))
{
String origClipboard = clipboard;
int amount = Integer.parseInt(lines.get(loc + 1)) - 1;
for(int i = 0; i < amount; i++)
clipboard += origClipboard;
}
else if(command.equals("Pasta!"))
{
System.out.println(clipboard);
System.exit(0);
}
else
fatal_error("unknown command '" + command + "' encountered on line " + new Integer(loc + 1).toString());
}
catch(Exception e)
{
fatal_error("error while executing command '" + command + "' on line " + new Integer(loc + 1).toString());
}
// increment past the command and the next line
loc += 2;
}
}
}</lang>
The following files were used for testing:
<br /><strong>prog1.cp</strong>
<pre>Copy
Rosetta Code
Duplicate
2
Pasta!</pre>
<strong>prog2.cp</strong>
<pre>CopyFile
pasta.txt
Duplicate
1
Pasta!</pre>
<strong>prog3.cp</strong>
<pre>Copy
Invalid
Duplicate
1
Goto
3
Pasta!</pre>
<strong>prog4.cp</strong>
<pre>CopyFile
TheF*ckingCode
Duplicate
2
Pasta!</pre>
<strong>pasta.txt</strong>
<pre>I'm the pasta.txt file.</pre>
{{out}}
<pre>$ java Copypasta prog1.cp
Rosetta CodeRosetta Code
$ java Copypasta prog2.cp
I'm the pasta.txt file.
$ java Copypasta prog3.cp
%unknown command '' encountered on line 5
usage: copypasta.nq [filename.cp]
$ java Copypasta prog4.cp
CopyFile
TheF*ckingCode
Duplicate
2
Pasta!
CopyFile
TheF*ckingCode
Duplicate
2
Pasta!
$ java Copypast doesntexist.cp
%error while trying to read from specified file
usage: Copypasta [filename.cp]
</pre>
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