Package fri.patterns.interpreter.parsergenerator

Examples of fri.patterns.interpreter.parsergenerator.Lexer$TokenListener

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  /** Returns the built Lexer, loaded with passed input (file, stream, string, ...). */
  public Lexer getLexer(Object input)
    throws IOException
  {
    Lexer lexer = getLexer();
    lexer.setInput(input);
    return lexer;
  }
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    @return deserialized Lexer, or one built from scratch that gets written to filesystem.
  */
  public Lexer get(Object syntaxInput, String baseName, List tokenSymbols, List ignoredSymbols)
    throws Exception
  {
    Lexer lexer = readLexer(syntaxInput, baseName);
    if (lexer == null)
      lexer = buildAndStoreLexer(syntaxInput, baseName, tokenSymbols, ignoredSymbols);
    return lexer;
  }
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    }
    // else: assume that syntaxInput is a prebuilt lexer Syntax and a list of ignored tokens
   
    TimeStopper ts = new TimeStopper();
    LexerBuilder builder = newLexerBuilder(syntax, ignoredSymbols);
    Lexer lexer = builder.getLexer();
    lexer.setTerminals(tokenSymbols);
    System.err.println("Lexer scratch construction took "+ts.getTimeMillis()+" millis");
   
    if (PRODUCTION)
      write(ensureFileName(syntaxInput, baseName), lexer);
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  /** Test main. Building serialized Lexer takes 330, building from scratch takes 130 millis. */
  public static void main(String [] args)  {
    try  {
      TimeStopper ts = new TimeStopper();
      Lexer lexer = new SerializedLexer().get(StandardLexerRules.lexerSyntax, "SyntaxBuilder");
      System.err.println("Lexer was built in "+ts.getTimeMillis()+" millis");
    }
    catch (Exception e)  {
      e.printStackTrace();
    }
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    try  {
      fri.util.TimeStopper ts = new fri.util.TimeStopper();

      SyntaxSeparation separation = new SyntaxSeparation(syntax);
      LexerBuilder builder = new LexerBuilder(separation.getLexerSyntax(), separation.getIgnoredSymbols());
      Lexer lexer = builder.getLexer();
      lexer.setDebug(true);
      lexer.setTerminals(separation.getTokenSymbols());

      System.err.println("time to build lexer was: "+ts.getInterval());

      InputStream in = ExampleLexer.class.getResourceAsStream("ExampleLexer.java");  //Reader in = new FileReader(args[0]);
      lexer.setInput(in);

      System.err.println("time to build input was: "+ts.getInterval());
     
      Token t;
      do  {
        t = lexer.getNextToken(null);
        //System.err.println(ts.getInterval()+" was time to read token "+t.symbol+" -> "+t.text);
       
        if (t.symbol == null)  {
          lexer.dump(System.err);
          throw new LexerException("Uninterpretable input!");
        }
        System.out.println(t.symbol+" "+">"+t.text+"<");
      }
      while (Token.isEpsilon(t) == false);
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  public static void main(String [] args)
    throws Exception
  {
    SyntaxSeparation separation = new SyntaxSeparation(new Syntax(syntax));  // separate lexer and parser syntax
    LexerBuilder builder = new LexerBuilder(separation.getLexerSyntax(), separation.getIgnoredSymbols());  // build a Lexer
    Lexer lexer = builder.getLexer();
    lexer.setInput("\tHello \r\n\tWorld\n");  // give the lexer some very complex input :-)
    ParserTables parserTables = new SLRParserTables(separation.getParserSyntax());
    Parser parser = new Parser(parserTables);
    parser.parse(lexer, new PrintSemantic());  // start parsing with a print-semantic
  }
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Related Classes of fri.patterns.interpreter.parsergenerator.Lexer$TokenListener

  • fri.patterns.interpreter.parsergenerator.builder.SerializedLexer
  • fri.patterns.interpreter.parsergenerator.examples.HelloWorldParser
  • fri.patterns.interpreter.parsergenerator.lexer.examples.ExampleLexer
  • fri.patterns.interpreter.parsergenerator.lexer.LexerBuilder
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