javaCC语法分析(whileifelsefor互相嵌套).docVIP

/** * JavaCC file */ options { JDK_VERSION = 1.5; DEBUG_PARSER = true;// } PARSER_BEGIN(whileParse) package whilepa; import java.io.FileInputStream; import java.io.FileNotFoundException; public class whileParse { public static void main(String args[]) throws ParseException { // whileParse parser = new whileParse(System.in); FileInputStream fileStream; try { fileStream = new FileInputStream(test.c); whileParse parser = new whileParse(fileStream); System.out.println(Reading from standard input...); System.out.print(Enter c programe only main() with only while();\ :); System.out.print(eg. void mian(){while(35)};\ :); try { switch (parser.start()) { case 0: System.out.println(OK.); break; case 1: System.out.println(Goodbye.); break; default: break; } } catch (Exception e) { System.out.println(NOK.); System.out.println(e.getMessage()); parser.ReInit(System.in); } catch (Error e) { System.out.println(Oops.); System.out.println(e.getMessage()); } } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } } PARSER_END(whileParse) SKIP : { | \r | \t | \n } TOKEN : /* OPERATORS */ { PLUS: + | MINUS: - | MULTIPLY: * | DIVIDE: / | PLUS2: ++ } TOKEN : { CONSTANT: ( DIGIT )+ | #DIGIT: [0 - 9] } TOKEN: { MAIN: main | VOID:void | WHILE:while | ASSIGN:= | IF:if | ELSE:else | FOR:for } TOKEN : /* 标识符 */ { IDENTIFIER: LETTER (LETTER|DIGIT)* | LETTER:[_,a-z,A-Z] } TOKEN: { GREAT: | LOWER: | GREATE:= | LOWERW:= } TOKEN: { LC:( | RC:) | LM:[ | RM:] | LB:{ | RB:} } int start() : {} { Procedure() EOF { return 0; } | ; { return 1; } } /*处理主程序*/ void Procedure():{} { VOID MAIN LCRCLBMix()RB } void Mix(): {} { (WhileStatement() | IfElse() | ForStatement())*