// This file is copyrighted and is part of nzdis-oql package. 
// See the file LICENSE for copyright information and the terms and conditions for copying, distributing and modifications of nzdis-oql package.
// @copyright@

package nzdis.lang.oql;

/**/
import nzdis.lang.oql.node.Node;
import nzdis.lang.oql.lexer.Lexer;
import nzdis.lang.oql.lexer.LexerException;
import nzdis.lang.oql.parser.Parser;
import nzdis.lang.oql.parser.ParserException;
import java.io.*;

/**
 * Generic parser API for OQL input. This class is not really a
 * builder (in terms of Builder pattern), while the result can be
 * collected directly from it. This builder will parse the input string 
 * and create Abstract Syntax Tree, via set of utility methods.
 *
 *@author Mariusz Nowostawski
 *@version @version@ $Revision: 1.1 $
 */
public class TreeBuilder {

  public static Node getNode(final Reader r, boolean simplified)
    throws IOException, LexerException, ParserException {
    return getNode(new PushbackReader(r), simplified);
  }
  
  public static Node getNode(final StringBuffer text, boolean simplified) 
    throws IOException, LexerException, ParserException {
    return getNode(text.toString(), simplified);
  }

  public static Node getNode(final String text)
    throws IOException, LexerException, ParserException {
    return getNode(text, true);
  }
  public static Node getNode(final String text, boolean simplified) 
    throws IOException, LexerException, ParserException {
    return getNode(new PushbackReader
      (new BufferedReader
        (new StringReader(text))), simplified);
  }
  
  public static Node getNode(final PushbackReader r, boolean simplified) 
    throws IOException, LexerException, ParserException {
    Lexer lexer = new Lexer(r);
    Parser parser = new Parser(lexer);
    Node ast = parser.parse();
    if(simplified) SimpleAstWalker.simplify(ast);
    return ast;
  }
  
} //TreeBuilder
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