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/**
   Licensed to the Apache Software Foundation (ASF) under one or more 
   contributor license agreements.  See the NOTICE file distributed with 
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with 
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
parser grammar HintParser;

options
{
  tokenVocab=HiveLexer;
  output=AST;
  ASTLabelType=ASTNode;
  backtrack=false;
  k=3;
}

tokens {
  TOK_HINTLIST;
  TOK_HINT;
  TOK_MAPJOIN;
  TOK_STREAMTABLE;
  TOK_HINTARGLIST;
  TOK_LEFTSEMIJOIN;
}

@header {
package org.apache.hadoop.hive.ql.parse;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
}


@members {
  ArrayList errors = new ArrayList();

  @Override
  public void displayRecognitionError(String[] tokenNames,
                                      RecognitionException e) {
    errors.add(new ParseError(this, e, tokenNames));
  }
}

// starting rule
hint
    : hintList EOF -> ^(TOK_HINTLIST hintList)
    ;

hintList
    :
    hintItem (COMMA hintItem)* -> hintItem+
    ;

hintItem
    :
    hintName (LPAREN hintArgs RPAREN)? -> ^(TOK_HINT hintName hintArgs?)
    ;

hintName
    :
    KW_MAPJOIN -> TOK_MAPJOIN
    | KW_SEMI -> TOK_LEFTSEMIJOIN
    | KW_STREAMTABLE -> TOK_STREAMTABLE
    ;

hintArgs
    :
    hintArgName (COMMA hintArgName)* -> ^(TOK_HINTARGLIST hintArgName+)
    ;

hintArgName
    :
    Identifier
    | Number
    | KW_NONE
    ;