예제 #1
0
 public void Visit(ImportantComment node)
 {
     if (node != null)
     {
         DoesRequire = false;
     }
 }
예제 #2
0
 public void Visit(ImportantComment node)
 {
     // comment, so we need to keep going
 }
 public void Visit(ImportantComment node)
 {
     // we're good?
 }
예제 #4
0
파일: jsparser.cs 프로젝트: nuxleus/ajaxmin
        //---------------------------------------------------------------------------------------
        // ParseStatement
        //
        //  OptionalStatement:
        //    Statement |
        //    <empty>
        //
        //  Statement :
        //    Block |
        //  VariableStatement |
        //  EmptyStatement |
        //  ExpressionStatement |
        //  IfStatement |
        //  IterationStatement |
        //  ContinueStatement |
        //  BreakStatement |
        //  ReturnStatement |
        //  WithStatement |
        //  LabeledStatement |
        //  SwitchStatement |
        //  ThrowStatement |
        //  TryStatement |
        //  FunctionDeclaration
        //
        // IterationStatement :
        //    'for' '(' ForLoopControl ')' |                  ===> ForStatement
        //    'do' Statement 'while' '(' Expression ')' |     ===> DoStatement
        //    'while' '(' Expression ')' Statement            ===> WhileStatement
        //
        //---------------------------------------------------------------------------------------

        // ParseStatement deals with the end of statement issue (EOL vs ';') so if any of the
        // ParseXXX routine does it as well, it should return directly from the switch statement
        // without any further execution in the ParseStatement
        private AstNode ParseStatement(bool fSourceElement)
        {
            AstNode statement = null;
            if (m_scanner.HasImportantComments 
                && m_settings.PreserveImportantComments
                && m_settings.IsModificationAllowed(TreeModifications.PreserveImportantComments))
            {
                // we have at least one important comment before the upcoming statement.
                // pop the first important comment off the queue, return that node instead.
                // don't advance the token -- we'll probably be coming back again for the next one (if any)
                statement = new ImportantComment(m_scanner.PopImportantComment(), this);
            }
            else
            {
                String id = null;

                switch (m_currentToken.Token)
                {
                    case JSToken.EndOfFile:
                        EOFError(JSError.ErrorEndOfFile);
                        throw new EndOfFileException(); // abort parsing, get back to the main parse routine
                    case JSToken.Semicolon:
                        // make an empty statement
                        statement = new Block(m_currentToken.Clone(), this);
                        GetNextToken();
                        return statement;
                    case JSToken.RightCurly:
                        ReportError(JSError.SyntaxError);
                        SkipTokensAndThrow();
                        break;
                    case JSToken.LeftCurly:
                        return ParseBlock();
                    case JSToken.Debugger:
                        return ParseDebuggerStatement();
                    case JSToken.Var:
                        return ParseVariableStatement((FieldAttributes)0);
                    case JSToken.If:
                        return ParseIfStatement();
                    case JSToken.For:
                        return ParseForStatement();
                    case JSToken.Do:
                        return ParseDoStatement();
                    case JSToken.While:
                        return ParseWhileStatement();
                    case JSToken.Continue:
                        statement = ParseContinueStatement();
                        if (null == statement)
                            return new Block(CurrentPositionContext(), this);
                        else
                            return statement;
                    case JSToken.Break:
                        statement = ParseBreakStatement();
                        if (null == statement)
                            return new Block(CurrentPositionContext(), this);
                        else
                            return statement;
                    case JSToken.Return:
                        statement = ParseReturnStatement();
                        if (null == statement)
                            return new Block(CurrentPositionContext(), this);
                        else
                            return statement;
                    case JSToken.With:
                        return ParseWithStatement();
                    case JSToken.Switch:
                        return ParseSwitchStatement();
                    case JSToken.Throw:
                        statement = ParseThrowStatement();
                        if (statement == null)
                            return new Block(CurrentPositionContext(), this);
                        else
                            break;
                    case JSToken.Try:
                        return ParseTryStatement();
                    case JSToken.Function:
                        // parse a function declaration
                        FunctionObject function = ParseFunction(FunctionType.Declaration, m_currentToken.Clone());

                        // now, if we aren't parsing source elements (directly in global scope or function body)
                        // then we want to throw a warning that different browsers will treat this function declaration
                        // differently. Technically, this location is not allowed. IE and most other browsers will 
                        // simply treat it like every other function declaration in this scope. Firefox, however, won't
                        // add this function declaration's name to the containing scope until the function declaration
                        // is actually "executed." So if you try to call it BEFORE, you will get a "not defined" error.
                        if (!fSourceElement)
                        {
                            ReportError(JSError.MisplacedFunctionDeclaration, function.IdContext, true);
                        }

                        return function;
                    case JSToken.Else:
                        ReportError(JSError.InvalidElse);
                        SkipTokensAndThrow();
                        break;
                    case JSToken.ConditionalCommentStart:
                        return ParseStatementLevelConditionalComment(fSourceElement);
                    case JSToken.ConditionalCompilationOn:
                        {
                            ConditionalCompilationOn ccOn = new ConditionalCompilationOn(m_currentToken.Clone(), this);
                            GetNextToken();
                            return ccOn;
                        }
                    case JSToken.ConditionalCompilationSet:
                        return ParseConditionalCompilationSet();
                    case JSToken.ConditionalCompilationIf:
                        return ParseConditionalCompilationIf(false);
                    case JSToken.ConditionalCompilationElseIf:
                        return ParseConditionalCompilationIf(true);
                    case JSToken.ConditionalCompilationElse:
                        {
                            ConditionalCompilationElse elseStatement = new ConditionalCompilationElse(m_currentToken.Clone(), this);
                            GetNextToken();
                            return elseStatement;
                        }
                    case JSToken.ConditionalCompilationEnd:
                        {
                            ConditionalCompilationEnd endStatement = new ConditionalCompilationEnd(m_currentToken.Clone(), this);
                            GetNextToken();
                            return endStatement;
                        }

                    case JSToken.AspNetBlock:
                        return ParseAspNetBlock(consumeSemicolonIfPossible: true);

                    default:
                        m_noSkipTokenSet.Add(NoSkipTokenSet.s_EndOfStatementNoSkipTokenSet);
                        bool exprError = false;
                        try
                        {
                            bool bAssign;
                            // if this statement starts with a function within parens, we want to know now
                            bool parenFunction = (m_currentToken.Token == JSToken.LeftParenthesis && m_scanner.PeekToken() == JSToken.Function);
                            statement = ParseUnaryExpression(out bAssign, false);
                            if (statement != null && parenFunction)
                            {
                                FunctionObject functionObject = statement.LeftHandSide as FunctionObject;
                                if (functionObject != null)
                                {
                                    functionObject.LeftHandFunctionExpression = true;
                                }
                            }

                            // look for labels
                            if (statement is Lookup && JSToken.Colon == m_currentToken.Token)
                            {
                                // can be a label
                                id = statement.ToString();
                                if (m_labelTable.ContainsKey(id))
                                {
                                    // there is already a label with that name. Ignore the current label
                                    ReportError(JSError.BadLabel, statement.Context.Clone(), true);
                                    id = null;
                                    GetNextToken(); // skip over ':'
                                    return new Block(CurrentPositionContext(), this);
                                }
                                else
                                {
                                    GetNextToken();
                                    int labelNestCount = m_labelTable.Count + 1;
                                    m_labelTable.Add(id, new LabelInfo(m_blockType.Count, labelNestCount));
                                    if (JSToken.EndOfFile != m_currentToken.Token)
                                    {
                                        statement = new LabeledStatement(
                                            statement.Context.Clone(),
                                            this,
                                            id,
                                            labelNestCount,
                                            ParseStatement(fSourceElement)
                                            );
                                    }
                                    else
                                    {
                                        // end of the file!
                                        //just pass null for the labeled statement
                                        statement = new LabeledStatement(
                                            statement.Context.Clone(),
                                            this,
                                            id,
                                            labelNestCount,
                                            null
                                            );
                                    }
                                    m_labelTable.Remove(id);
                                    return statement;
                                }
                            }
                            statement = ParseExpression(statement, false, bAssign, JSToken.None);
                        }
                        catch (RecoveryTokenException exc)
                        {
                            if (exc._partiallyComputedNode != null)
                                statement = exc._partiallyComputedNode;

                            if (statement == null)
                            {
                                m_noSkipTokenSet.Remove(NoSkipTokenSet.s_EndOfStatementNoSkipTokenSet);
                                exprError = true;
                                SkipTokensAndThrow();
                            }

                            if (IndexOfToken(NoSkipTokenSet.s_EndOfStatementNoSkipTokenSet, exc) == -1)
                            {
                                exc._partiallyComputedNode = statement;
                                throw;
                            }
                        }
                        finally
                        {
                            if (!exprError)
                                m_noSkipTokenSet.Remove(NoSkipTokenSet.s_EndOfStatementNoSkipTokenSet);
                        }
                        break;
                }

                if (JSToken.Semicolon == m_currentToken.Token)
                {
                    statement.Context.UpdateWith(m_currentToken);
                    GetNextToken();
                }
                else if (!m_scanner.GotEndOfLine && JSToken.RightCurly != m_currentToken.Token && JSToken.EndOfFile != m_currentToken.Token)
                {
                    ReportError(JSError.NoSemicolon, true);
                }
            }
            return statement;
        }
예제 #5
0
 public void Visit(ImportantComment node)
 {
     ReportError(node);
 }
 public void Visit(ImportantComment node)
 {
     // invalid! ignore
     IsValid = false;
 }