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comparison src/luan/impl/LuanParser.java @ 1520:d9a5405a3102

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try statement
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Jun 2020 18:14:13 -0600
parents 6c830be6be98
children d4407e8de707
comparison
equal deleted inserted replaced
1519:3ebf9781707c 1520:d9a5405a3102
320 || (stmt=ForStmt()) != null 320 || (stmt=ForStmt()) != null
321 || (stmt=DoStmt()) != null 321 || (stmt=DoStmt()) != null
322 || (stmt=WhileStmt()) != null 322 || (stmt=WhileStmt()) != null
323 || (stmt=RepeatStmt()) != null 323 || (stmt=RepeatStmt()) != null
324 || (stmt=IfStmt()) != null 324 || (stmt=IfStmt()) != null
325 || (stmt=TryStmt()) != null
325 || (stmt=SetStmt()) != null 326 || (stmt=SetStmt()) != null
326 || (stmt=ExpressionsStmt()) != null 327 || (stmt=ExpressionsStmt()) != null
327 ) { 328 ) {
328 return stmt; 329 return stmt;
329 } 330 }
479 if( !Keyword("in") ) 480 if( !Keyword("in") )
480 return parser.failure(null); 481 return parser.failure(null);
481 Expr expr = RequiredExpr().single(); 482 Expr expr = RequiredExpr().single();
482 RequiredKeyword("do"); 483 RequiredKeyword("do");
483 484
484 String fnVar = "fn"+ ++forCounter; 485 String fnVar = "fn" + ++forCounter;
485 Expr fnExp = new Expr(null,false); 486 Expr fnExp = new Expr(null,false);
486 fnExp.add( fnVar + ".call()" ); 487 fnExp.add( fnVar + ".call()" );
487 Stmts stmt = new Stmts(); 488 Stmts stmt = new Stmts();
488 stmt.add( "" 489 stmt.add( ""
489 +"LuanFunction "+fnVar+" = Luan.checkFunction(" 490 +"LuanFunction "+fnVar+" = Luan.checkFunction("
589 590
590 private Stmts RepeatStmt() throws ParseException { 591 private Stmts RepeatStmt() throws ParseException {
591 parser.begin(); 592 parser.begin();
592 if( !Keyword("repeat") ) 593 if( !Keyword("repeat") )
593 return parser.failure(null); 594 return parser.failure(null);
594 Stmts loop =RequiredLoopBlock(); 595 Stmts loop = RequiredLoopBlock();
595 RequiredKeyword("until"); 596 RequiredKeyword("until");
596 Expr cnd = RequiredExpr().single(); 597 Expr cnd = RequiredExpr().single();
597 Stmts stmt = new Stmts(); 598 Stmts stmt = new Stmts();
598 stmt.add( "do { " ); 599 stmt.add( "do { " );
599 stmt.addAll( loop ); 600 stmt.addAll( loop );
648 hasReturn = false; 649 hasReturn = false;
649 } 650 }
650 RequiredEnd("end_if"); 651 RequiredEnd("end_if");
651 stmt.add( "} " ); 652 stmt.add( "} " );
652 stmt.hasReturn = hasReturn; 653 stmt.hasReturn = hasReturn;
654 return parser.success( stmt );
655 }
656
657 int catchCounter = 0;
658
659 private Stmts TryStmt() throws ParseException {
660 parser.begin();
661 if( !Keyword("try") )
662 return parser.failure(null);
663 Stmts tryBlock = RequiredBlock();
664 Stmts catchBlock = null;
665 Stmts finallyBlock = null;
666 Stmts stmt = new Stmts();
667 stmt.add( "try { LuanImpl.nopTry(); " );
668 stmt.addAll( tryBlock );
669 if( Keyword("catch") ) {
670 String name = Name();
671 Expr exp = new Expr(Val.SINGLE,false);
672 String var = "e" + ++catchCounter;
673 exp.add( var+".table(luan)" );
674 stmt.add( "} catch(LuanException "+var+") { " );
675 stmt.addAll( addSymbol(name,exp) );
676 catchBlock = RequiredBlock();
677 stmt.addAll( catchBlock );
678 popSymbols(1);
679 }
680 if( Keyword("finally") ) {
681 finallyBlock = RequiredBlock();
682 stmt.add( "} finally { " );
683 stmt.addAll( finallyBlock );
684 }
685 RequiredEnd("end_try");
686 if( catchBlock==null && finallyBlock==null )
687 stmt.add( "} finally { " );
688 stmt.add( "} " );
689 stmt.hasReturn = finallyBlock!=null && finallyBlock.hasReturn || tryBlock.hasReturn && (catchBlock==null || catchBlock.hasReturn);
653 return parser.success( stmt ); 690 return parser.success( stmt );
654 } 691 }
655 692
656 private Stmts SetStmt() throws ParseException { 693 private Stmts SetStmt() throws ParseException {
657 parser.begin(); 694 parser.begin();
1465 } 1502 }
1466 1503
1467 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( 1504 private static final Set<String> keywords = new HashSet<String>(Arrays.asList(
1468 "and", 1505 "and",
1469 "break", 1506 "break",
1507 "catch",
1470 "continue", 1508 "continue",
1471 "do", 1509 "do",
1472 "else", 1510 "else",
1473 "elseif", 1511 "elseif",
1474 "end", 1512 "end",
1475 "end_do", 1513 "end_do",
1476 "end_for", 1514 "end_for",
1477 "end_function", 1515 "end_function",
1478 "end_if", 1516 "end_if",
1517 "end_try",
1479 "end_while", 1518 "end_while",
1480 "false", 1519 "false",
1520 "finally",
1481 "for", 1521 "for",
1482 "function", 1522 "function",
1483 "goto", 1523 "goto",
1484 "if", 1524 "if",
1485 "in", 1525 "in",