Exemple #1
0
  /**
   * Create NFA, DFA and generate code for grammar. Create NFA for any delegates first. Once all NFA
   * are created, it's ok to create DFA, which must check for left-recursion. That check is done by
   * walking the full NFA, which therefore must be complete. After all NFA, comes DFA conversion for
   * root grammar then code gen for root grammar. DFA and code gen for delegates comes next.
   */
  protected void generateRecognizer(Grammar grammar) {
    String language = (String) grammar.getOption("language");
    if (language != null) {
      CodeGenerator generator = new CodeGenerator(this, grammar, language);
      grammar.setCodeGenerator(generator);
      generator.setDebug(isDebug());
      generator.setProfile(isProfile());
      generator.setTrace(isTrace());

      // generate NFA early in case of crash later (for debugging)
      if (isGenerate_NFA_dot()) {
        generateNFAs(grammar);
      }

      // GENERATE CODE
      generator.genRecognizer();

      if (isGenerate_DFA_dot()) {
        generateDFAs(grammar);
      }

      List<Grammar> delegates = grammar.getDirectDelegates();
      for (int i = 0; delegates != null && i < delegates.size(); i++) {
        Grammar delegate = (Grammar) delegates.get(i);
        if (delegate != grammar) { // already processing this one
          generateRecognizer(delegate);
        }
      }
    }
  }
Exemple #2
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  public void process() {
    boolean exceptionWhenWritingLexerFile = false;
    String lexerGrammarFileName = null; // necessary at this scope to have access in the catch below

    // Have to be tricky here when Maven or build tools call in and must new Tool()
    // before setting options. The banner won't display that way!
    if (isVerbose() && showBanner) {
      ErrorManager.info("ANTLR Parser Generator  Version " + VERSION);
      showBanner = false;
    }

    try {
      sortGrammarFiles(); // update grammarFileNames
    } catch (Exception e) {
      ErrorManager.error(ErrorManager.MSG_INTERNAL_ERROR, e);
    } catch (Error e) {
      ErrorManager.error(ErrorManager.MSG_INTERNAL_ERROR, e);
    }

    for (String grammarFileName : grammarFileNames) {
      // If we are in make mode (to support build tools like Maven) and the
      // file is already up to date, then we do not build it (and in verbose mode
      // we will say so).
      if (make) {
        try {
          if (!buildRequired(grammarFileName)) continue;
        } catch (Exception e) {
          ErrorManager.error(ErrorManager.MSG_INTERNAL_ERROR, e);
        }
      }

      if (isVerbose() && !isDepend()) {
        System.out.println(grammarFileName);
      }
      try {
        if (isDepend()) {
          BuildDependencyGenerator dep = new BuildDependencyGenerator(this, grammarFileName);
          /*
          List outputFiles = dep.getGeneratedFileList();
          List dependents = dep.getDependenciesFileList();
          System.out.println("output: "+outputFiles);
          System.out.println("dependents: "+dependents);
           */
          System.out.println(dep.getDependencies());
          continue;
        }

        Grammar grammar = getRootGrammar(grammarFileName);
        // we now have all grammars read in as ASTs
        // (i.e., root and all delegates)
        grammar.composite.assignTokenTypes();
        grammar.composite.defineGrammarSymbols();
        grammar.composite.createNFAs();

        generateRecognizer(grammar);

        if (isPrintGrammar()) {
          grammar.printGrammar(System.out);
        }

        if (isReport()) {
          GrammarReport greport = new GrammarReport(grammar);
          System.out.println(greport.toString());
          // print out a backtracking report too (that is not encoded into log)
          System.out.println(greport.getBacktrackingReport());
          // same for aborted NFA->DFA conversions
          System.out.println(greport.getAnalysisTimeoutReport());
        }
        if (isProfile()) {
          GrammarReport greport = new GrammarReport(grammar);
          Stats.writeReport(GrammarReport.GRAMMAR_STATS_FILENAME, greport.toNotifyString());
        }

        // now handle the lexer if one was created for a merged spec
        String lexerGrammarStr = grammar.getLexerGrammar();
        // System.out.println("lexer grammar:\n"+lexerGrammarStr);
        if (grammar.type == Grammar.COMBINED && lexerGrammarStr != null) {
          lexerGrammarFileName = grammar.getImplicitlyGeneratedLexerFileName();
          try {
            Writer w = getOutputFile(grammar, lexerGrammarFileName);
            w.write(lexerGrammarStr);
            w.close();
          } catch (IOException e) {
            // emit different error message when creating the implicit lexer fails
            // due to write permission error
            exceptionWhenWritingLexerFile = true;
            throw e;
          }
          try {
            StringReader sr = new StringReader(lexerGrammarStr);
            Grammar lexerGrammar = new Grammar();
            lexerGrammar.composite.watchNFAConversion = internalOption_watchNFAConversion;
            lexerGrammar.implicitLexer = true;
            lexerGrammar.setTool(this);
            File lexerGrammarFullFile =
                new File(getFileDirectory(lexerGrammarFileName), lexerGrammarFileName);
            lexerGrammar.setFileName(lexerGrammarFullFile.toString());

            lexerGrammar.importTokenVocabulary(grammar);
            lexerGrammar.parseAndBuildAST(sr);

            sr.close();

            lexerGrammar.composite.assignTokenTypes();
            lexerGrammar.composite.defineGrammarSymbols();
            lexerGrammar.composite.createNFAs();

            generateRecognizer(lexerGrammar);
          } finally {
            // make sure we clean up
            if (deleteTempLexer) {
              File outputDir = getOutputDirectory(lexerGrammarFileName);
              File outputFile = new File(outputDir, lexerGrammarFileName);
              outputFile.delete();
            }
          }
        }
      } catch (IOException e) {
        if (exceptionWhenWritingLexerFile) {
          ErrorManager.error(ErrorManager.MSG_CANNOT_WRITE_FILE, lexerGrammarFileName, e);
        } else {
          ErrorManager.error(ErrorManager.MSG_CANNOT_OPEN_FILE, grammarFileName);
        }
      } catch (Exception e) {
        ErrorManager.error(ErrorManager.MSG_INTERNAL_ERROR, grammarFileName, e);
      }
      /*
      finally {
      System.out.println("creates="+ Interval.creates);
      System.out.println("hits="+ Interval.hits);
      System.out.println("misses="+ Interval.misses);
      System.out.println("outOfRange="+ Interval.outOfRange);
      }
       */
    }
  }