public void Visit(EmptyStatement node)
{
// invalid! ignore
IsValid = false;
}
public void Visit(EmptyStatement node)
{
// invalid! ignore
IsValid = false;
}
public void Visit(EmptyStatement node)
{
// not applicable; terminate
}
public void Visit(EmptyStatement node)
{
Debug.Fail("shouldn't get here");
}
public void Visit(EmptyStatement node)
{
// nothing to do
}
public void Visit(EmptyStatement node)
{
Debug.Fail("shouldn't get here");
}
private AstNode ParseStatement(bool fSourceElement)
{
AstNode statement = null;
if (m_importantComments.Count > 0
&& 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_importantComments[0], this);
m_importantComments.RemoveAt(0);
}
else
{
String id = null;
var isNewModule = m_newModule;
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 EmptyStatement(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:
case JSToken.Const:
case JSToken.Let:
return ParseVariableStatement();
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());
function.IsSourceElement = fSourceElement;
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;
}
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 && 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
{
var colonContext = m_currentToken.Clone();
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)
{
Label = id,
ColonContext = colonContext,
NestCount = labelNestCount,
Statement = ParseStatement(fSourceElement)
};
}
else
{
// end of the file!
//just pass null for the labeled statement
statement = new LabeledStatement(statement.Context.Clone(), this)
{
Label = id,
ColonContext = colonContext,
NestCount = labelNestCount
};
}
m_labelTable.Remove(id);
return statement;
}
}
statement = ParseExpression(statement, false, bAssign, JSToken.None);
// if we just started a new module and this statement happens to be an expression statement...
if (isNewModule && statement.IsExpression)
{
// see if it's a constant wrapper
var constantWrapper = statement as ConstantWrapper;
if (constantWrapper != null && constantWrapper.PrimitiveType == PrimitiveType.String)
{
// we found a string constant expression statement right after the start of a new
// module. Let's make it a DirectivePrologue if it isn't already
if (!(statement is DirectivePrologue))
{
statement = new DirectivePrologue(constantWrapper.Value.ToString(), constantWrapper.Context, this)
{
MayHaveIssues = constantWrapper.MayHaveIssues
};
}
}
}
var binaryOp = statement as BinaryOperator;
if (binaryOp != null
&& (binaryOp.OperatorToken == JSToken.Equal || binaryOp.OperatorToken == JSToken.StrictEqual))
{
// an expression statement with equality operator? Doesn't really do anything.
// Did the developer intend this to be an assignment operator instead? Low-pri warning.
binaryOp.OperatorContext.IfNotNull(c => c.HandleError(JSError.SuspectEquality, false));
}
var lookup = statement as Lookup;
if (lookup != null
&& lookup.Name.StartsWith("<%=", StringComparison.Ordinal) && lookup.Name.EndsWith("%>", StringComparison.Ordinal))
{
// single lookup, but it's actually one or more ASP.NET blocks.
// convert back to an asp.net block node
statement = new AspNetBlockNode(statement.Context, this)
{
AspNetBlockText = lookup.Name
};
}
var aspNetBlock = statement as AspNetBlockNode;
if (aspNetBlock != null && JSToken.Semicolon == m_currentToken.Token)
{
aspNetBlock.IsTerminatedByExplicitSemicolon = true;
statement.IfNotNull(s => s.TerminatingContext = m_currentToken.Clone());
GetNextToken();
}
// we just parsed an expression statement. Now see if we have an appropriate
// semicolon to terminate it.
if (JSToken.Semicolon == m_currentToken.Token)
{
statement.IfNotNull(s => s.TerminatingContext = m_currentToken.Clone());
GetNextToken();
}
else if (m_foundEndOfLine || JSToken.RightCurly == m_currentToken.Token || JSToken.EndOfFile == m_currentToken.Token)
{
// semicolon insertion rules
// (if there was no statement parsed, then don't fire a warning)
// a right-curly or an end of line is something we don't WANT to throw a warning for.
// Just too common and doesn't really warrant a warning (in my opinion)
if (statement != null
&& JSToken.RightCurly != m_currentToken.Token && JSToken.EndOfFile != m_currentToken.Token)
{
ReportError(JSError.SemicolonInsertion, statement.Context.IfNotNull(c => c.FlattenToEnd()), true);
}
}
else
{
ReportError(JSError.NoSemicolon, true);
}
}
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;
}
}
return statement;
}
public void Visit(EmptyStatement node)
{
// not applicable; terminate
}
public void Visit(EmptyStatement node)
{
// nothing to do
}