/* * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ options {  JAVA_UNICODE_ESCAPE = true;  STATIC = false;} PARSER_BEGIN(ExpressionParser) package com.sun.tools.example.debug.expr; import com.sun.jdi.*;import java.util.Stack;import java.util.List;import java.util.ArrayList; public class ExpressionParser {       Stack stack = new Stack();      VirtualMachine vm = null;  GetFrame frameGetter = null;  private static GetFrame lastFrameGetter;  private static LValue lastLValue;   LValue peek() {    return (LValue)stack.peek();  }   LValue pop() {    return (LValue)stack.pop();  }   void push(LValue lval) {    stack.push(lval);  }   public static Value getMassagedValue() throws ParseException {        return lastLValue.getMassagedValue(lastFrameGetter);  }   public interface GetFrame {        StackFrame get() throws IncompatibleThreadStateException;  }   public static Value evaluate(String expr, VirtualMachine vm,                                GetFrame frameGetter) throws ParseException,                                            InvocationException, 					    InvalidTypeException,					    ClassNotLoadedException,					    IncompatibleThreadStateException {        // TODO StringBufferInputStream is deprecated.        java.io.InputStream in = new java.io.StringBufferInputStream(expr);        ExpressionParser parser = new ExpressionParser(in);        parser.vm = vm;        parser.frameGetter = frameGetter;	Value value = null;        parser.Expression();	lastFrameGetter = frameGetter;	lastLValue = parser.pop();	return lastLValue.getValue();  }   public static void main(String args[]) {    ExpressionParser parser;    System.out.print("Java Expression Parser:  ");    if (args.length == 0) {      System.out.println("Reading from standard input . . .");      parser = new ExpressionParser(System.in);    } else if (args.length == 1) {      System.out.println("Reading from file " + args[0] + " . . .");      try {        parser = new ExpressionParser(new java.io.FileInputStream(args[0]));      } catch (java.io.FileNotFoundException e) {        System.out.println("Java Parser Version 1.0.2:  File " +                            args[0] + " not found.");        return;      }    } else {      System.out.println("Usage is one of:");      System.out.println("         java ExpressionParser < inputfile");      System.out.println("OR");      System.out.println("         java ExpressionParser inputfile");      return;    }    try {        parser.Expression();        System.out.print("Java Expression Parser:  ");        System.out.println("Java program parsed successfully.");    } catch (ParseException e) {        System.out.print("Java Expression Parser:  ");        System.out.println("Encountered errors during parse.");    }  } } PARSER_END(ExpressionParser)  SKIP : /* WHITE SPACE */{  " "| "\t"| "\n"| "\r"| "\f"} SPECIAL_TOKEN : /* COMMENTS */{  <SINGLE_LINE_COMMENT: "//" (~["\n","\r"])* ("\n"|"\r"|"\r\n")>| <FORMAL_COMMENT: "/**" (~["*"])* "*" ("*" | (~["*","/"] (~["*"])* "*"))* "/">| <MULTI_LINE_COMMENT: "/*" (~["*"])* "*" ("*" | (~["*","/"] (~["*"])* "*"))* "/">} TOKEN : /* RESERVED WORDS AND LITERALS */{  < ABSTRACT: "abstract" >| < BOOLEAN: "boolean" >| < BREAK: "break" >| < BYTE: "byte" >| < CASE: "case" >| < CATCH: "catch" >| < CHAR: "char" >| < CLASS: "class" >| < CONST: "const" >| < CONTINUE: "continue" >| < _DEFAULT: "default" >| < DO: "do" >| < DOUBLE: "double" >| < ELSE: "else" >| < EXTENDS: "extends" >| < FALSE: "false" >| < FINAL: "final" >| < FINALLY: "finally" >| < FLOAT: "float" >| < FOR: "for" >| < GOTO: "goto" >| < IF: "if" >| < IMPLEMENTS: "implements" >| < IMPORT: "import" >| < INSTANCEOF: "instanceof" >| < INT: "int" >| < INTERFACE: "interface" >| < LONG: "long" >| < NATIVE: "native" >| < NEW: "new" >| < NULL: "null" >| < PACKAGE: "package">| < PRIVATE: "private" >| < PROTECTED: "protected" >| < PUBLIC: "public" >| < RETURN: "return" >| < SHORT: "short" >| < STATIC: "static" >| < SUPER: "super" >| < SWITCH: "switch" >| < SYNCHRONIZED: "synchronized" >| < THIS: "this" >| < THROW: "throw" >| < THROWS: "throws" >| < TRANSIENT: "transient" >| < TRUE: "true" >| < TRY: "try" >| < VOID: "void" >| < VOLATILE: "volatile" >| < WHILE: "while" >} TOKEN : /* LITERALS */{  <    INTEGER_LITERAL:        <DECIMAL_LITERAL> (["l","L"])?      | <HEX_LITERAL> (["l","L"])?      | <OCTAL_LITERAL> (["l","L"])?  >|  < #DECIMAL_LITERAL: ["1"-"9"] (["0"-"9"])* >|  < #HEX_LITERAL: "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])+ >|  < #OCTAL_LITERAL: "0" (["0"-"7"])* >|  < FLOATING_POINT_LITERAL:        (["0"-"9"])+ "." (["0"-"9"])* (<EXPONENT>)? (["f","F","d","D"])?      | "." (["0"-"9"])+ (<EXPONENT>)? (["f","F","d","D"])?      | (["0"-"9"])+ <EXPONENT> (["f","F","d","D"])?      | (["0"-"9"])+ (<EXPONENT>)? ["f","F","d","D"]  >|  < #EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+ >|  < CHARACTER_LITERAL:      "'"      (   (~["'","\\","\n","\r"])        | ("\\"            ( ["n","t","b","r","f","\\","'","\""]            | ["0"-"7"] ( ["0"-"7"] )?            | ["0"-"3"] ["0"-"7"] ["0"-"7"]            )          )      )      "'"  >|  < STRING_LITERAL:      "\""      (   (~["\"","\\","\n","\r"])        | ("\\"            ( ["n","t","b","r","f","\\","'","\""]            | ["0"-"7"] ( ["0"-"7"] )?            | ["0"-"3"] ["0"-"7"] ["0"-"7"]            )          )      )*      "\""  >} TOKEN : /* IDENTIFIERS */{  < IDENTIFIER: <LETTER> (<LETTER>|<DIGIT>)* >|  < #LETTER:      [       "\u0024",       "\u0041"-"\u005a",       "\u005f",       "\u0061"-"\u007a",       "\u00c0"-"\u00d6",       "\u00d8"-"\u00f6",       "\u00f8"-"\u00ff",       "\u0100"-"\u1fff",       "\u3040"-"\u318f",       "\u3300"-"\u337f",       "\u3400"-"\u3d2d",       "\u4e00"-"\u9fff",       "\uf900"-"\ufaff"      ]  >|  < #DIGIT:      [       "\u0030"-"\u0039",       "\u0660"-"\u0669",       "\u06f0"-"\u06f9",       "\u0966"-"\u096f",       "\u09e6"-"\u09ef",       "\u0a66"-"\u0a6f",       "\u0ae6"-"\u0aef",       "\u0b66"-"\u0b6f",       "\u0be7"-"\u0bef",       "\u0c66"-"\u0c6f",       "\u0ce6"-"\u0cef",       "\u0d66"-"\u0d6f",       "\u0e50"-"\u0e59",       "\u0ed0"-"\u0ed9",       "\u1040"-"\u1049"      ]  >} TOKEN : /* SEPARATORS */{  < LPAREN: "(" >| < RPAREN: ")" >| < LBRACE: "{" >| < RBRACE: "}" >| < LBRACKET: "[" >| < RBRACKET: "]" >| < SEMICOLON: ";" >| < COMMA: "," >| < DOT: "." >} TOKEN : /* OPERATORS */{  < ASSIGN: "=" >| < GT: ">" >| < LT: "<" >| < BANG: "!" >| < TILDE: "~" >| < HOOK: "?" >| < COLON: ":" >| < EQ: "==" >| < LE: "<=" >| < GE: ">=" >| < NE: "!=" >| < SC_OR: "||" >| < SC_AND: "&&" >| < INCR: "++" >| < DECR: "--" >| < PLUS: "+" >| < MINUS: "-" >| < STAR: "*" >| < SLASH: "/" >| < BIT_AND: "&" >| < BIT_OR: "|" >| < XOR: "^" >| < REM: "%" >| < LSHIFT: "<<" >| < RSIGNEDSHIFT: ">>" >| < RUNSIGNEDSHIFT: ">>>" >| < PLUSASSIGN: "+=" >| < MINUSASSIGN: "-=" >| < STARASSIGN: "*=" >| < SLASHASSIGN: "/=" >| < ANDASSIGN: "&=" >| < ORASSIGN: "|=" >| < XORASSIGN: "^=" >| < REMASSIGN: "%=" >| < LSHIFTASSIGN: "<<=" >| < RSIGNEDSHIFTASSIGN: ">>=" >| < RUNSIGNEDSHIFTASSIGN: ">>>=" >}  /***************************************** * THE JAVA LANGUAGE GRAMMAR STARTS HERE * *****************************************/ /* * Type, name and expression syntax follows. */ void Type() :{}{  ( PrimitiveType() | Name() ) ( "[" "]" )*} void PrimitiveType() :{}{  "boolean"|  "char"|  "byte"|  "short"|  "int"|  "long"|  "float"|  "double"}  String Name() :{StringBuffer sb = new StringBuffer();}{  <IDENTIFIER> { sb.append(token); }  ( LOOKAHEAD(2) "." <IDENTIFIER> { sb.append('.'); sb.append(token); }  )*        { return sb.toString(); }} void NameList() :{}{  Name()  ( "," Name()  )*}  /* * Expression syntax follows. */ void Expression() :{}{  LOOKAHEAD( PrimaryExpression() AssignmentOperator() )  Assignment()|  ConditionalExpression()} void Assignment() :{}{  PrimaryExpression() AssignmentOperator() Expression()        { LValue exprVal = pop(); pop().setValue(exprVal); push(exprVal);}} void AssignmentOperator() :{}{  "=" | "*=" | "/=" | "%=" | "+=" | "-=" | "<<=" | ">>=" | ">>>=" | "&=" | "^=" | "|="} void ConditionalExpression() :{}{  ConditionalOrExpression()         [ "?" Expression() ":" ConditionalExpression()                 { LValue falseBranch = pop(); LValue trueBranch = pop();                   Value cond = pop().interiorGetValue();                  if (cond instanceof BooleanValue) {                        push(((BooleanValue)cond).booleanValue()?                                         trueBranch : falseBranch);                  } else {                        throw new ParseException("Condition must be boolean");                  }                }        ]} void ConditionalOrExpression() :{}{  ConditionalAndExpression()         ( "||" ConditionalAndExpression()                         { throw new ParseException("operation not yet supported"); }        )*} void ConditionalAndExpression() :{}{  InclusiveOrExpression()         ( "&&" InclusiveOrExpression()                         { throw new ParseException("operation not yet supported"); }        )*} void InclusiveOrExpression() :{}{  ExclusiveOrExpression()         ( "|" ExclusiveOrExpression()                         { throw new ParseException("operation not yet supported"); }        )*} void ExclusiveOrExpression() :{}{  AndExpression()         ( "^" AndExpression()                         { throw new ParseException("operation not yet supported"); }        )*} void AndExpression() :{}{  EqualityExpression()         ( "&" EqualityExpression()                         { throw new ParseException("operation not yet supported"); }        )*} void EqualityExpression() :{Token tok;}{  InstanceOfExpression()         ( ( tok = "==" | tok = "!=" ) InstanceOfExpression()                 { LValue left = pop();                   push( LValue.booleanOperation(vm, tok, pop(), left) ); }        )*} void InstanceOfExpression() :{}{  RelationalExpression()         [ "instanceof" Type()                         { throw new ParseException("operation not yet supported"); }        ]}

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