javacc-7.0.4.examples.JJTreeExamples.cpp.eg3.jjt Maven / Gradle / Ivy

/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */


options {
  MULTI=true;
  NODE_DEFAULT_VOID=true;
  OUTPUT_LANGUAGE="c++";
  NAMESPACE="EG3";
}

PARSER_BEGIN(Parser)
//package EG3;
//
///** An Arithmetic Grammar. */
//public class Eg3 {
//  /** Main entry point. */
//  public static void main(String args[]) {
//    System.out.println("Reading from standard input...");
//    Eg3 t = new Eg3(System.in);
//    try {
//      ASTStart n = t.Start();
//      n.dump("");
//      System.out.println("Thank you.");
//    } catch (Exception e) {
//      System.out.println("Oops.");
//      System.out.println(e.getMessage());
//      e.printStackTrace();
//    }
//  }
//}

PARSER_END(Parser)


SKIP :
{
  " "
| "\t"
| "\n"
| "\r"
| <"//" (~["\n","\r"])* ("\n"|"\r"|"\r\n")>
| <"/*" (~["*"])* "*" (~["/"] (~["*"])* "*")* "/">
}

TOKEN : /* LITERALS */
{
  < INTEGER_LITERAL:
         (["l","L"])?
      |  (["l","L"])?
      |  (["l","L"])?
  >
|
  < #DECIMAL_LITERAL: ["1"-"9"] (["0"-"9"])* >
|
  < #HEX_LITERAL: "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])+ >
|
  < #OCTAL_LITERAL: "0" (["0"-"7"])* >
}

TOKEN : /* IDENTIFIERS */
{
  < IDENTIFIER:  (|)* >
|
  < #LETTER: ["_","a"-"z","A"-"Z"] >
|
  < #DIGIT: ["0"-"9"] >
}

/** Main production. */
ASTStart* Start() #Start : {}
{
  Expression() ";"
  { return jjtThis; }
}

/** An Expression. */
void Expression() : {}
{
  AdditiveExpression()
}

/** An Additive Expression. */
void AdditiveExpression() : {}
{
  (
    MultiplicativeExpression() ( ( "+" | "-" ) MultiplicativeExpression() )*
  ) #Add(>1)
}

/** A Multiplicative Expression. */
void MultiplicativeExpression() : {}
{
  (
    UnaryExpression() ( ( "*" | "/" | "%" ) UnaryExpression() )*
  ) #Mult(>1)
}

/** A Unary Expression. */
void UnaryExpression() : {}
{
  "(" Expression() ")" | Identifier() | Integer()
}

/** An Identifier. */
void Identifier() #MyID :
{
  Token* t;
}
{
  t=
  {
    jjtThis->setName(t->image);
  }
}

/** An Integer. */
void Integer() #Integer : {}
{
  
}