Java Code Examples for org.eclipse.xtext.xtext.generator.parser.antlr.AntlrOptions#isBacktrack()

@Override
protected String compileParserImports(final Grammar it, final AntlrOptions options) {
  StringConcatenation _builder = new StringConcatenation();
  _builder.newLine();
  _builder.append("import org.eclipse.xtext.*;");
  _builder.newLine();
  _builder.append("import org.eclipse.xtext.parser.*;");
  _builder.newLine();
  _builder.append("import org.eclipse.xtext.parser.impl.*;");
  _builder.newLine();
  _builder.append("import org.eclipse.emf.ecore.util.EcoreUtil;");
  _builder.newLine();
  _builder.append("import org.eclipse.emf.ecore.EObject;");
  _builder.newLine();
  {
    boolean _isEmpty = GrammarUtil.allEnumRules(it).isEmpty();
    boolean _not = (!_isEmpty);
    if (_not) {
      _builder.append("import org.eclipse.emf.common.util.Enumerator;");
      _builder.newLine();
    }
  }
  _builder.append("import ");
  String _name = this.getGrammarNaming().getInternalParserSuperClass(it).getName();
  _builder.append(_name);
  _builder.append(";");
  _builder.newLineIfNotEmpty();
  _builder.append("import org.eclipse.xtext.parser.antlr.XtextTokenStream;");
  _builder.newLine();
  _builder.append("import org.eclipse.xtext.parser.antlr.XtextTokenStream.HiddenTokens;");
  _builder.newLine();
  {
    if (((!IterableExtensions.isEmpty(Iterables.<UnorderedGroup>filter((Iterables.<EObject>concat(ListExtensions.<ParserRule, List<EObject>>map(GrammarUtil.allParserRules(it), ((Function1<ParserRule, List<EObject>>) (ParserRule it_1) -> {
      return EcoreUtil2.eAllContentsAsList(it_1);
    })))), UnorderedGroup.class))) && options.isBacktrack())) {
      _builder.append("import org.eclipse.xtext.parser.antlr.IUnorderedGroupHelper.UnorderedGroupState;");
      _builder.newLine();
    }
  }
  _builder.append("import org.eclipse.xtext.parser.antlr.AntlrDatatypeRuleToken;");
  _builder.newLine();
  _builder.append("import ");
  String _name_1 = this._grammarAccessExtensions.getGrammarAccess(it).getName();
  _builder.append(_name_1);
  _builder.append(";");
  _builder.newLineIfNotEmpty();
  _builder.newLine();
  return _builder.toString();
}
 

@Override
protected String compileParserMembers(final Grammar it, final AntlrOptions options) {
  StringConcatenation _builder = new StringConcatenation();
  _builder.newLine();
  _builder.append("@");
  {
    boolean _isCombinedGrammar = this.isCombinedGrammar();
    if (_isCombinedGrammar) {
      _builder.append("parser::");
    }
  }
  _builder.append("members {");
  _builder.newLineIfNotEmpty();
  _builder.newLine();
  {
    boolean _isBacktrack = options.isBacktrack();
    if (_isBacktrack) {
      _builder.append("/*");
      _builder.newLine();
      _builder.append("  ");
      _builder.append("This grammar contains a lot of empty actions to work around a bug in ANTLR.");
      _builder.newLine();
      _builder.append("  ");
      _builder.append("Otherwise the ANTLR tool will create synpreds that cannot be compiled in some rare cases.");
      _builder.newLine();
      _builder.append("*/");
      _builder.newLine();
      _builder.newLine();
    }
  }
  _builder.append(" \t");
  _builder.append("private ");
  String _simpleName = this._grammarAccessExtensions.getGrammarAccess(it).getSimpleName();
  _builder.append(_simpleName, " \t");
  _builder.append(" grammarAccess;");
  _builder.newLineIfNotEmpty();
  _builder.newLine();
  _builder.append("    ");
  _builder.append("public ");
  String _simpleName_1 = this.naming.getInternalParserClass(it).getSimpleName();
  _builder.append(_simpleName_1, "    ");
  _builder.append("(TokenStream input, ");
  String _simpleName_2 = this._grammarAccessExtensions.getGrammarAccess(it).getSimpleName();
  _builder.append(_simpleName_2, "    ");
  _builder.append(" grammarAccess) {");
  _builder.newLineIfNotEmpty();
  _builder.append("        ");
  _builder.append("this(input);");
  _builder.newLine();
  _builder.append("        ");
  _builder.append("this.grammarAccess = grammarAccess;");
  _builder.newLine();
  _builder.append("        ");
  _builder.append("registerRules(grammarAccess.getGrammar());");
  _builder.newLine();
  _builder.append("    ");
  _builder.append("}");
  _builder.newLine();
  _builder.newLine();
  _builder.append("    ");
  _builder.append("@Override");
  _builder.newLine();
  _builder.append("    ");
  _builder.append("protected String getFirstRuleName() {");
  _builder.newLine();
  _builder.append("    \t");
  _builder.append("return \"");
  String _name = AntlrGrammarGenUtil.<ParserRule>getOriginalElement(IterableExtensions.<ParserRule>head(GrammarUtil.allParserRules(it))).getName();
  _builder.append(_name, "    \t");
  _builder.append("\";");
  _builder.newLineIfNotEmpty();
  _builder.append("   \t");
  _builder.append("}");
  _builder.newLine();
  _builder.newLine();
  _builder.append("   \t");
  _builder.append("@Override");
  _builder.newLine();
  _builder.append("   \t");
  _builder.append("protected ");
  String _simpleName_3 = this._grammarAccessExtensions.getGrammarAccess(it).getSimpleName();
  _builder.append(_simpleName_3, "   \t");
  _builder.append(" getGrammarAccess() {");
  _builder.newLineIfNotEmpty();
  _builder.append("   \t\t");
  _builder.append("return grammarAccess;");
  _builder.newLine();
  _builder.append("   \t");
  _builder.append("}");
  _builder.newLine();
  _builder.newLine();
  _builder.append("}");
  _builder.newLine();
  return _builder.toString();
}
 

@Override
protected String _ebnf2(final Action it, final AntlrOptions options, final boolean supportActions) {
  String _xifexpression = null;
  if (supportActions) {
    StringConcatenation _builder = new StringConcatenation();
    {
      boolean _isBacktrack = options.isBacktrack();
      if (_isBacktrack) {
        _builder.append("{");
        _builder.newLine();
        _builder.append("\t");
        _builder.append("/* */");
        _builder.newLine();
        _builder.append("}");
        _builder.newLine();
      }
    }
    _builder.append("{");
    _builder.newLine();
    _builder.append("\t");
    _builder.append("$current = forceCreateModelElement");
    {
      String _feature = it.getFeature();
      boolean _tripleNotEquals = (_feature != null);
      if (_tripleNotEquals) {
        _builder.append("And");
        String _firstUpper = StringExtensions.toFirstUpper(this._grammarAccessExtensions.setOrAdd(it));
        _builder.append(_firstUpper, "\t");
      }
    }
    _builder.append("(");
    _builder.newLineIfNotEmpty();
    _builder.append("\t\t");
    _builder.append("grammarAccess.");
    String _grammarElementAccess = this._grammarAccessExtensions.grammarElementAccess(AntlrGrammarGenUtil.<Action>getOriginalElement(it));
    _builder.append(_grammarElementAccess, "\t\t");
    _builder.append(",");
    _builder.newLineIfNotEmpty();
    _builder.append("\t\t");
    _builder.append("$current);");
    _builder.newLine();
    _builder.append("}");
    _builder.newLine();
    _xifexpression = _builder.toString();
  } else {
    _xifexpression = super._ebnf2(it, options, supportActions);
  }
  return _xifexpression;
}
 

@Override
protected String _assignmentEbnf(final CrossReference it, final Assignment assignment, final AntlrOptions options, final boolean supportActions) {
  String _xifexpression = null;
  if (supportActions) {
    StringConcatenation _builder = new StringConcatenation();
    {
      boolean _isBacktrack = options.isBacktrack();
      if (_isBacktrack) {
        _builder.append("{");
        _builder.newLine();
        _builder.append("\t");
        _builder.append("/* */");
        _builder.newLine();
        _builder.append("}");
        _builder.newLine();
      }
    }
    _builder.append("{");
    _builder.newLine();
    _builder.append("\t");
    _builder.append("if ($current==null) {");
    _builder.newLine();
    _builder.append("\t\t");
    _builder.append("$current = ");
    CharSequence _createModelElement = this.createModelElement(assignment);
    _builder.append(_createModelElement, "\t\t");
    _builder.append(";");
    _builder.newLineIfNotEmpty();
    _builder.append("\t");
    _builder.append("}");
    _builder.newLine();
    _builder.append("}");
    _builder.newLine();
    String __assignmentEbnf = super._assignmentEbnf(it, assignment, options, supportActions);
    _builder.append(__assignmentEbnf);
    _xifexpression = _builder.toString();
  } else {
    _xifexpression = super._assignmentEbnf(it, assignment, options, supportActions);
  }
  return _xifexpression;
}
 

protected boolean isParserBackTracking(final Grammar it, final AntlrOptions options) {
  return options.isBacktrack();
}
 

public boolean definesUnorderedGroups(final ParserRule it, final AntlrOptions options) {
  return (options.isBacktrack() && (!EcoreUtil2.<UnorderedGroup>typeSelect(EcoreUtil2.eAllContentsAsList(it), UnorderedGroup.class).isEmpty()));
}