public void Visit(JsEmptyStatement node)
{
// empty statement, so we don't care
}
public void Visit(JsEmptyStatement node)
{
// invalid! ignore
IsValid = false;
}
public void Visit(JsEmptyStatement node)
{
// empty statement, so we don't care
}
public void Visit(JsEmptyStatement node)
{
// not applicable; terminate
}
public void Visit(JsEmptyStatement node)
{
// invalid! ignore
IsValid = false;
}
public void Visit(JsEmptyStatement node)
{
Debug.Fail("shouldn't get here");
}
public void Visit(JsEmptyStatement node)
{
// not applicable; terminate
}
private JsAstNode ParseStatement(bool fSourceElement, bool skipImportantComment = false)
{
JsAstNode statement = null;
// if we want to skip important comments, now is a good time to clear anything we may
// have picked up already.
if (skipImportantComment)
{
m_importantComments.Clear();
}
if (m_importantComments.Count > 0
&& m_settings.PreserveImportantComments
&& m_settings.IsModificationAllowed(JsTreeModifications.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 JsImportantComment(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 EndOfStreamException(); // abort parsing, get back to the main parse routine
case JsToken.Semicolon:
// make an empty statement
statement = new JsEmptyStatement(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 JsBlock(CurrentPositionContext(), this);
else
return statement;
case JsToken.Break:
statement = ParseBreakStatement();
if (null == statement)
return new JsBlock(CurrentPositionContext(), this);
else
return statement;
case JsToken.Return:
statement = ParseReturnStatement();
if (null == statement)
return new JsBlock(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 JsBlock(CurrentPositionContext(), this);
else
break;
case JsToken.Try:
return ParseTryStatement();
case JsToken.Function:
// parse a function declaration
JsFunctionObject function = ParseFunction(JsFunctionType.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:
{
JsConditionalCompilationOn ccOn = new JsConditionalCompilationOn(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:
{
JsConditionalCompilationElse elseStatement = new JsConditionalCompilationElse(m_currentToken.Clone(), this);
GetNextToken();
return elseStatement;
}
case JsToken.ConditionalCompilationEnd:
{
JsConditionalCompilationEnd endStatement = new JsConditionalCompilationEnd(m_currentToken.Clone(), this);
GetNextToken();
return endStatement;
}
default:
m_noSkipTokenSet.Add(NoSkipTokenSet.s_EndOfStatementNoSkipTokenSet);
bool exprError = false;
try
{
bool bAssign;
statement = ParseUnaryExpression(out bAssign, false);
// look for labels
if (statement is JsLookup && 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 JsBlock(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)
{
// ignore any important comments between the label and its statement
// because important comments are treated like statements, and we want
// to make sure the label is attached to the right REAL statement.
statement = new JsLabeledStatement(statement.Context.Clone(), this)
{
Label = id,
ColonContext = colonContext,
NestCount = labelNestCount,
Statement = ParseStatement(fSourceElement, true)
};
}
else
{
// end of the file!
//just pass null for the labeled statement
statement = new JsLabeledStatement(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 JsConstantWrapper;
if (constantWrapper != null && constantWrapper.PrimitiveType == JsPrimitiveType.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 JsDirectivePrologue))
{
statement = new JsDirectivePrologue(constantWrapper.Value.ToString(), constantWrapper.Context, this)
{
MayHaveIssues = constantWrapper.MayHaveIssues
};
}
}
}
var binaryOp = statement as JsBinaryOperator;
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 JsLookup;
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 JsAspNetBlockNode(statement.Context, this)
{
AspNetBlockText = lookup.Name
};
}
var aspNetBlock = statement as JsAspNetBlockNode;
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(JsEmptyStatement node)
{
// nothing to do
}
public void Visit(JsEmptyStatement node)
{
// nothing to do
}
public void Visit(JsEmptyStatement node)
{
Debug.Fail("shouldn't get here");
}
public void Visit(JsEmptyStatement node)
{
if (node != null)
{
// empty statement is just a semicolon
OutputPossibleLineBreak(';');
MarkSegment(node, null, node.Context);
SetContextOutputPosition(node.Context);
}
}