CLI arguments

1 files changed, 140 insertions, 0 deletions

diff --git a/dice-lang/src/bjc/dicelang/CLIArgsParser.java b/dice-lang/src/bjc/dicelang/CLIArgsParser.java
index b8e0baf..02762cb 100644
--- a/dice-lang/src/bjc/dicelang/CLIArgsParser.java
+++ b/dice-lang/src/bjc/dicelang/CLIArgsParser.java
@@ -1,5 +1,145 @@
 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.*;
+
 public class CLIArgsParser {
+	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"))) {
+			/*
+			 * @TODO show help
+			 */
+			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)) {
+			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 {
+					Errors.inst.printError(EK_CLI_INVDFNTYPE, ln.substring(0, ln.indexOf(' ')));
+					return -1;
+				}
+			}
+
+			scan.close();
+		} 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;
+	}
 }