/*
* 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 org.apache.jena.atlas.json.io.parser;
import static org.apache.jena.riot.tokens.TokenType.EOF ;
import org.apache.jena.atlas.iterator.PeekIterator ;
import org.apache.jena.atlas.json.JsonParseException ;
import org.apache.jena.riot.tokens.Token ;
import org.apache.jena.riot.tokens.TokenType ;
import org.apache.jena.riot.tokens.Tokenizer ;
class JSONParserBase
{
protected boolean VERBOSE = true ;
private Tokenizer tokens ;
private PeekIterator<Token> peekTokens ;
protected long currLine = -1 ;
protected long currCol = -1 ;
protected JSONParserBase(Tokenizer tokens)
{
this.tokens = tokens ;
peekTokens = new PeekIterator<>(tokens) ;
}
private Token tokenEOF = null ;
final protected boolean eof()
{
if ( tokenEOF != null )
return true ;
if ( ! moreTokens() )
{
tokenEOF = new Token(tokens.getLine(), tokens.getColumn()) ;
return true ;
}
return false ;
}
final protected boolean moreTokens()
{
return peekTokens.hasNext() ;
}
final protected boolean lookingAt(TokenType tokenType)
{
Token t = peekTokens.peek() ;
if ( t == null )
return tokenType == EOF ;
return t.hasType(tokenType) ;
}
final protected boolean lookingAtString()
{
Token t = peekTokens.peek() ;
if ( t == null )
return false ;
if ( t.hasType(TokenType.STRING1) ) return true ;
if ( t.hasType(TokenType.STRING2) ) return true ;
if ( t.hasType(TokenType.LONG_STRING1) ) return true ;
if ( t.hasType(TokenType.LONG_STRING2) ) return true ;
return false ;
}
final protected boolean lookingAtNumber()
{
Token t = peekTokens.peek() ;
if ( t == null )
return false ;
if ( t.hasType(TokenType.INTEGER) ) return true ;
if ( t.hasType(TokenType.HEX) ) return true ;
if ( t.hasType(TokenType.DECIMAL) ) return true ;
if ( t.hasType(TokenType.DOUBLE) ) return true ;
return false ;
}
final protected Token peekToken()
{
// Avoid repeating.
if ( eof() ) return tokenEOF ;
return peekTokens.element() ;
}
final protected Token nextToken()
{
if ( eof() )
return tokenEOF ;
Token t = peekTokens.next() ;
currLine = t.getLine() ;
currCol = t.getColumn() ;
// if ( VERBOSE ) log.info("Move: " + t) ;
return t ;
}
final protected void expectOrEOF(String msg, TokenType tokenType)
{
// DOT or EOF
if ( eof() )
return ;
expect(msg, tokenType) ;
}
final protected void expect(String msg, TokenType ttype)
{
if ( ! lookingAt(ttype) )
exception(msg) ;
nextToken() ;
}
final protected void exception(String msg, Object... args)
{ throw new JsonParseException(String.format(msg, args),
(int)tokens.getLine(),
(int)tokens.getColumn()) ; }
}