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package bjc.dicelang;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner;
import static bjc.dicelang.Errors.ErrorKey.*;
/**
* Parse CLI arguments.
*
* @author Ben Culkin
*
*/
public class CLIArgsParser {
/**
* Parse the provided set of CLI arguments.
*
* @param args The CLI arguments to parse.
* @param eng The engine to affect with parsing.
*
* @return Whether or not to continue to the DiceLang repl.
*/
public static boolean parseArgs(String[] args, DiceLangEngine eng) {
if (args.length < 0) {
return true;
}
if (args.length == 1 && (args[0].equals("--help") || args[0].equals("-h"))) {
System.out.println("Help for DiceLang v0.2 CLI arguments:");
System.out.println("\t-d or --debug\tTurn on debug mode.");
System.out.println("\t\tTurns on debug mode, which prints additional information that may be useful.");
System.out.println("\t-nd or --no-debug\tTurn off debug mode.");
System.out.println("\t\tTurns off debug mode.");
System.out.println("\t-po or --postfix\tTurn on postfix mode.");
System.out.println("\t\tTurns on postfix mode, which disables the shunter.");
System.out.println("\t-npo or --no-postfix\tTurn off postfix mode.");
System.out.println("\t\tTurns off postfix mode.");
System.out.println("\t-pr or --prefix\tTurn on prefix mode.");
System.out.println("\t\tTurns on prefix mode, which reverses the expression instead of shunting it.");
System.out.println("\t-npr or --no-prefix\tTurn off prefix mode.");
System.out.println("\t\tTurns off prefix mode.");
System.out.println("\t-se or --step-eval\tTurn on step-eval mode.");
System.out.println("\t\tTurns on step-evaluation, which shows the evaluation process step-by-step. Currently slightly broken.");
System.out.println("\t-nse or --no-step-eval\tTurn off step-eval mode.");
System.out.println("\t\tTurns off step-evaluation.");
System.out.println("\t-D or ");
System.exit(0);
}
for (int i = 0; i < args.length; i++) {
String arg = args[i];
boolean succ = true;
switch (arg) {
case "-d":
case "--debug":
if (!eng.toggleDebug()) {
eng.toggleDebug();
}
break;
case "-nd":
case "--no-debug":
if (eng.toggleDebug()) {
eng.toggleDebug();
}
break;
case "-po":
case "--postfix":
if (!eng.togglePostfix()) {
eng.togglePostfix();
}
break;
case "-npo":
case "--no-postfix":
if (eng.togglePostfix()) {
eng.togglePostfix();
}
break;
case "-pr":
case "--prefix":
if (!eng.togglePrefix()) {
eng.togglePrefix();
}
break;
case "-npr":
case "--no-prefix":
if (eng.togglePrefix()) {
eng.togglePrefix();
}
break;
case "-se":
case "--stepeval":
if (!eng.toggleStepEval()) {
eng.toggleStepEval();
}
break;
case "-nse":
case "--no-stepeval":
if (eng.toggleStepEval()) {
eng.toggleStepEval();
}
break;
case "-D":
case "--define":
i = simpleDefine(i, args, eng);
if (i == -1) {
return false;
}
break;
case "-df":
case "--define-file":
i = defineFile(i, args, eng);
if (i == -1) {
return false;
}
break;
default:
Errors.inst.printError(EK_CLI_UNARG, arg);
return false;
}
}
return true;
}
private static int simpleDefine(int i, String[] args, DiceLangEngine eng) {
if (i >= (args.length - 1)) {
Errors.inst.printError(EK_CLI_MISARG, "define");
return -1;
}
if (i >= (args.length - 2)) {
Define dfn = new Define(5, false, false, false, null, args[i + 1], Arrays.asList(""));
if (dfn.inError) {
return -1;
}
eng.addLineDefine(dfn);
return i + 1;
}
Define dfn = new Define(5, false, false, false, null, args[i + 1], Arrays.asList(args[i + 2]));
if (dfn.inError) {
return -1;
}
eng.addLineDefine(dfn);
return i + 2;
}
private static int defineFile(int i, String[] args, DiceLangEngine eng) {
if (i >= (args.length - 1)) {
Errors.inst.printError(EK_CLI_MISARG, "define-file");
return -1;
}
String fName = args[i + 1];
try (FileInputStream fis = new FileInputStream(fName)) {
try (Scanner scan = new Scanner(fis)) {
while (scan.hasNextLine()) {
String ln = scan.nextLine();
Define dfn = parseDefine(ln.substring(ln.indexOf(' ')));
if (dfn == null || dfn.inError) {
return -1;
}
if (ln.startsWith("line")) {
eng.addLineDefine(dfn);
} else if (ln.startsWith("token")) {
eng.addTokenDefine(dfn);
} else {
String defnType = ln.substring(0, ln.indexOf(' '));
Errors.inst.printError(EK_CLI_INVDFNTYPE, defnType);
return -1;
}
}
}
} catch (FileNotFoundException fnfex) {
Errors.inst.printError(EK_CLI_NOFILE, fName);
return -1;
} catch (IOException ioex) {
Errors.inst.printError(EK_CLI_IOEX);
return -1;
}
return i + 1;
}
private static Define parseDefine(String ln) {
Define res = null;
// @TODO move this functionality from DiceLangConsole to some
// common ground where it can be used by both functions
return res;
}
}
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