Added until statement

.gitignore

@@ -3,4 +3,3 @@ out/
 *.zip
 prg/**/*.ast
 prg/**/*.out
-prg/**/*.pins25

prg/test.pins25

@@ -0,0 +1,10 @@
+var i = 0
+
+fun main() =
+	until i >= 10 do
+		putint(i),
+		i = i + 1
+	end,
+	0
+
+fun putint(n)

src/pins25/common/Token.java

@@ -57,6 +57,10 @@ public record Token(Report.Location location, Symbol symbol, String lexeme) impl
          * Kljucna beseda {@code while}.
          */
         WHILE,
+        /**
+         * Kljucna beseda {@code until}.
+         */
+        UNTIL,
         /**
          * Kljucna beseda {@code do}.
          */

src/pins25/phase/LexAn.java

@@ -315,6 +315,7 @@ public class LexAn implements AutoCloseable {
             case "then" -> Token.Symbol.THEN;
             case "else" -> Token.Symbol.ELSE;
             case "while" -> Token.Symbol.WHILE;
+            case "until" -> Token.Symbol.UNTIL;
             case "do" -> Token.Symbol.DO;
             case "let" -> Token.Symbol.LET;
             case "in" -> Token.Symbol.IN;

src/pins25/phase/SynAn.java

@@ -227,6 +227,21 @@ public class SynAn implements AutoCloseable {
                 return whileStmt;
             }
 
+            case UNTIL: {
+                // statement -> until expression do statements end
+                Token untilT = check(Token.Symbol.UNTIL);
+                AST.Expr cond = parseExpression();
+                check(Token.Symbol.DO);
+                List<AST.Stmt> stmts = parseStatements();
+                Token end = check(Token.Symbol.END);
+
+                AST.Expr negCond = new AST.UnExpr(AST.UnExpr.Oper.NOT, cond);
+                
+                AST.WhileStmt whileStmt = new AST.WhileStmt(negCond, stmts);
+                attrLoc.put(whileStmt, new Report.Location(untilT, end));
+                return whileStmt;
+            }
+
             case LET: {
                 // statement -> let definition reststmtdefs in statements end
                 Token let = check(Token.Symbol.LET);