main.sa

Java写的词法/语法分析器。可生成JAVA语言或者是C++的词法和语法分析器。并可产生语法分析树和对该树进行遍历

class MAIN is

   shared filter : ANTLR_TOKEN_STREAM_HIDDEN_TOKEN_FILTER;

   main ( args : ARRAY{STR} ) is

      if ( args.size < 2 ) then
	 #OUT + "usage " + args[0] + " <filename>\n";
	 return;
      end;
	 
      f : IFSTREAM := IFSTREAM::open_for_read( args[1] );

      if ( void(f) ) then
	 #OUT + "file \"" + args[1] + "\" not found\n";
	 return;
      end;

      lexer ::= #INSTR_LEXER{ANTLR_COMMON_HIDDEN_STREAM_TOKEN}( f );
      filter ::= #ANTLR_TOKEN_STREAM_HIDDEN_TOKEN_FILTER( lexer );
      if ( void( filter ) ) then
	 #OUT + "created void\n";
      end;
	       
      parser ::= #INSTR_PARSER{ANTLR_COMMON_HIDDEN_STREAM_TOKEN,
			       ANTLR_COMMON_AST_WITH_HIDDEN_TOKENS}( filter );

      filter.hide( parser.WS );
      filter.hide( parser.SL_COMMENT );
      
      protect
	 parser.slist;
      when $STR then
	 #ERR + "error: " + exception.str;
      end;

      t : ANTLR_COMMON_AST_WITH_HIDDEN_TOKENS := parser.ast;
      walker ::= #INSTR_TREE_WALKER{ANTLR_COMMON_AST_WITH_HIDDEN_TOKENS}( filter );
      
      protect
	 walker.slist(t);
      when $STR then
	 #ERR + "error: " + exception.str;
      end;
   end;
end;