/**
 * 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.
 */

options
{
  // Use \ u escapes in streams AND use a reader for the query
  // => get both raw and escaped unicode
   JAVA_UNICODE_ESCAPE   = true ;
   UNICODE_INPUT         = false ;

  STATIC                = false ;
//   DEBUG_PARSER          = true ;
//   DEBUG_TOKEN_MANAGER   = true ;
}

PARSER_BEGIN(SSE_ParserCore)
/**
 * 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.
 */

package com.hp.hpl.jena.sparql.sse.lang.parser ;

import com.hp.hpl.jena.sparql.sse.lang.ParserSSEBase ;
    

public class SSE_ParserCore extends ParserSSEBase
{
}

PARSER_END(SSE_ParserCore)

// Now has explicit WS control in the grammar.
// Policy - eat trailing WS

// ---- Entry points : check for EOF.

void parse() : { }
{
    { parseStart() ; }
    (<WS>)*
    TermOrList()
    <EOF>
    { parseFinish() ; }
}

void term() : { }
{
    { parseStart() ; }
    Term()
    <EOF>
    { parseFinish() ; }
}

// ----

void TermOrList() : { }
{
  ( Term() (<WS>)* |  List() )
}

void List() : { Token t ; }
{
    // The OP token must exclude these
  ( t = <LPAREN> 
    (<WS>)*
    { listStart(t.beginLine, t.beginColumn) ; }
    BareList() 
    t = <RPAREN>
    (<WS>)*
    { listFinish(t.beginLine, t.beginColumn) ; }

  | t = <LBRACKET> 
    (<WS>)*
    { listStart(t.beginLine, t.beginColumn) ; }
    BareList() 
    t = <RBRACKET>
    (<WS>)*
    { listFinish(t.beginLine, t.beginColumn) ; }  )
}

void BareList() : { }
{
  ( 
     TermOrList()
     // White space swallowed
  )*
}

void Term() : { Token t ; }
{
    Symbol()
  |
    IRIref()
  |
    PrefixedName()
  | 
    Var()
  |
    Literal()
  |
    BlankNode()
}


void Symbol() : { Token t ; }
{
    t = <SYMBOL>
    { emitSymbol(t.beginLine, t.beginColumn, t.image) ; }
}

void IRIref() : { Token t ; String s ; }
{
  t = <IRIref>
    { 
      s = t.image ;
      s = stripQuotes(s) ;
      s = unescapeStr(s, t.beginLine, t.beginColumn) ;
      emitIRI(t.beginLine, t.beginColumn, s) ; } 
}

void PrefixedName() : { Token t ; }
{
  t = <PNAME>
    { emitPName(t.beginLine, t.beginColumn, t.image) ; }
}

void Var() : { Token t ; }
{
    // VAR_NAMED:   "?"  and any legal SPARQL variable.
    // VAR_NAMED2:  "?." and non-legal SPARQL variable (usually allocated)
    // VAR_ANON:    "??" : Anon variables.


    // Includes "?" as a variable which allocated one from ?0, ?1, ?2 
    //    Legal SPARQL syntax.
    // Includes "??" as a variable for anon non-distinguished variables.
    // Includes non-distinguished variables as ??0
    // Includes internal allocated variables as ?.0

//  ( t = <VAR_NAMED> | t = <VAR_NAMED2> | t = <VAR_ANON> )
  ( t = <VAR_NAMED> | t = <VAR_OTHER> )
  { emitVar(t.beginLine, t.beginColumn, stripChars(t.image, 1)) ; }
}

void Literal() : { }
{
 ( RDFLiteral()
 | NumericLiteral()
// | BooleanLiteral() // Do as a symbol.
 )
}

void BlankNode() : { Token t ; }
{
  t = <BLANK_NODE_LABEL>
    { emitBNode(t.beginLine, t.beginColumn, stripChars(t.image, 2)) ; }  
//|
//  t = <LBRACKET> <RBRACKET> { return emitBNode(t.beginLine, t.beginColumn) ; }
//  t = <ANON> { return emitBNode(t.beginLine, t.beginColumn) ; }
}

void RDFLiteral() : { Token t = null ; int currLine ; int currColumn ;
                      String lex ; String lang = null ;
                      String dt_iri = null ; String dt_pn = null ; }
{
  ( t = <STRING_LITERAL1> { lex = stripQuotes(t.image) ; }
  | t = <STRING_LITERAL2> { lex = stripQuotes(t.image) ; }
  | t = <STRING_LITERAL_LONG1> { lex = stripQuotes3(t.image) ; }
  | t = <STRING_LITERAL_LONG2> { lex = stripQuotes3(t.image) ; }
  )
  { currLine = t.beginLine ; currColumn = t.beginColumn ;
    lex = unescapeStr(lex, currLine, currColumn) ;
  }

  // Optional lang tag and datatype.
  (
     t = <LANGTAG> { lang = stripChars(t.image, 1) ; }
  |
    <DATATYPE> 
    ( t = <IRIref> { dt_iri  = stripQuotes(t.image) ; }
    | t = <PNAME>  { dt_pn = t.image ; }
    )
  )?
  { emitLiteral(currLine, currColumn, lex, lang, dt_iri, dt_pn) ; }
} 

void NumericLiteral() : { Token t ; }
{
  t = <INTEGER>
   { emitLiteralInteger(t.beginLine, t.beginColumn, t.image) ; }
| t = <DECIMAL>
   { emitLiteralDecimal(t.beginLine, t.beginColumn, t.image) ; }
| t = <DOUBLE>
   { emitLiteralDouble(t.beginLine, t.beginColumn, t.image) ; }
}

// Symbol!
// Node BooleanLiteral() : {}
// {
//   <TRUE> { return XSD_TRUE ; }
//  |
//   <FALSE> { return XSD_FALSE ; }
// }

// No whitespace skipping.
#undef SKIP
#include "tokens.inc"
#include "copyright.inc"

/*
# Local Variables:
# tab-width: 4
# indent-tabs-mode: nil
# comment-default-style: "//"
# End:
*/