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package bjc.dicelang;
import bjc.dicelang.util.ResourceLoader;
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"))) {
for(String lne : ResourceLoader.loadHelpFile("cli")) {
System.out.println(lne);
}
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;
case "-ctf":
case "--compiler-tweak-file":
/*
* @TODO not yet implemented
*/
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_MISC_NOFILE, fName);
return -1;
} catch(IOException ioex) {
Errors.inst.printError(EK_MISC_IOEX, fName);
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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