public virtual void Visit(JsLexicalDeclaration node)
{
if (node != null)
{
foreach (var childNode in node.Children)
{
childNode.Accept(this);
}
}
}
public void Visit(JsLexicalDeclaration node)
{
// invalid! ignore
IsValid = false;
}
public virtual void Visit(JsLexicalDeclaration node)
{
if (node != null)
{
foreach (var childNode in node.Children)
{
childNode.Accept(this);
}
}
}
public void Visit(JsLexicalDeclaration node)
{
if (node != null)
{
// lexical declarations get an order index
node.Index = NextOrderIndex;
for (var ndx = 0; ndx < node.Count; ++ndx)
{
var decl = node[ndx];
if (decl != null)
{
decl.Accept(this);
}
}
}
}
public void Visit(JsLexicalDeclaration node)
{
Debug.Fail("shouldn't get here");
}
//---------------------------------------------------------------------------------------
// ParseVariableStatement
//
// VariableStatement :
// 'var' VariableDeclarationList
// or
// 'const' VariableDeclarationList
// or
// 'let' VariableDeclarationList
//
// VariableDeclarationList :
// VariableDeclaration |
// VariableDeclaration ',' VariableDeclarationList
//
// VariableDeclaration :
// Identifier Initializer
//
// Initializer :
// <empty> |
// '=' AssignmentExpression
//---------------------------------------------------------------------------------------
private JsAstNode ParseVariableStatement()
{
// create the appropriate statement: var- or const-statement
JsDeclaration varList;
if (m_currentToken.Token == JsToken.Var)
{
varList = new JsVar(m_currentToken.Clone(), this);
}
else if (m_currentToken.Token == JsToken.Const || m_currentToken.Token == JsToken.Let)
{
if (m_currentToken.Token == JsToken.Const && m_settings.ConstStatementsMozilla)
{
varList = new JsConstStatement(m_currentToken.Clone(), this);
}
else
{
varList = new JsLexicalDeclaration(m_currentToken.Clone(), this)
{
StatementToken = m_currentToken.Token
};
}
}
else
{
Debug.Fail("shouldn't get here");
return null;
}
bool single = true;
JsAstNode vdecl = null;
JsAstNode identInit = null;
for (; ; )
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_EndOfLineToken);
try
{
identInit = ParseIdentifierInitializer(JsToken.None);
}
catch (RecoveryTokenException exc)
{
// an exception is passing by, possibly bringing some info, save the info if any
if (exc._partiallyComputedNode != null)
{
if (!single)
{
varList.Append(exc._partiallyComputedNode);
varList.Context.UpdateWith(exc._partiallyComputedNode.Context);
exc._partiallyComputedNode = varList;
}
}
if (IndexOfToken(NoSkipTokenSet.s_EndOfLineToken, exc) == -1)
throw;
else
{
if (single)
identInit = exc._partiallyComputedNode;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_EndOfLineToken);
}
if (identInit != null)
{
vdecl = identInit;
varList.Append(vdecl);
}
if (m_currentToken.Token == JsToken.Comma)
{
single = false;
vdecl.IfNotNull(d => d.TerminatingContext = m_currentToken.Clone());
}
else if (m_currentToken.Token == JsToken.Semicolon)
{
varList.TerminatingContext = m_currentToken.Clone();
GetNextToken();
break;
}
else if (m_foundEndOfLine || m_currentToken.Token == JsToken.RightCurly || m_currentToken.Token == JsToken.EndOfFile)
{
// semicolon insertion rules
// 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 (JsToken.RightCurly != m_currentToken.Token && JsToken.EndOfFile != m_currentToken.Token)
{
ReportError(JsError.SemicolonInsertion, varList.Context.IfNotNull(c => c.FlattenToEnd()), true);
}
break;
}
else
{
ReportError(JsError.NoSemicolon, false);
break;
}
}
if (vdecl != null)
{
varList.Context.UpdateWith(vdecl.Context);
}
return varList;
}
private JsAstNode ParseForStatement()
{
m_blockType.Add(BlockType.Loop);
JsAstNode forNode = null;
try
{
JsContext forCtx = m_currentToken.Clone();
GetNextToken();
if (JsToken.LeftParenthesis != m_currentToken.Token)
{
ReportError(JsError.NoLeftParenthesis);
}
GetNextToken();
bool isForIn = false, recoveryInForIn = false;
JsAstNode lhs = null, initializer = null, condOrColl = null, increment = null;
JsContext operatorContext = null;
JsContext separator1Context = null;
JsContext separator2Context = null;
try
{
if (JsToken.Var == m_currentToken.Token
|| JsToken.Let == m_currentToken.Token
|| JsToken.Const == m_currentToken.Token)
{
isForIn = true;
JsDeclaration declaration;
if (m_currentToken.Token == JsToken.Var)
{
declaration = new JsVar(m_currentToken.Clone(), this);
}
else
{
declaration = new JsLexicalDeclaration(m_currentToken.Clone(), this)
{
StatementToken = m_currentToken.Token
};
}
declaration.Append(ParseIdentifierInitializer(JsToken.In));
// a list of variable initializers is allowed only in a for(;;)
while (JsToken.Comma == m_currentToken.Token)
{
isForIn = false;
declaration.Append(ParseIdentifierInitializer(JsToken.In));
//initializer = new Comma(initializer.context.CombineWith(var.context), initializer, var);
}
initializer = declaration;
// if it could still be a for..in, now it's time to get the 'in'
// TODO: for ES6 might be 'of'
if (isForIn)
{
if (JsToken.In == m_currentToken.Token
|| (m_currentToken.Token == JsToken.Identifier && string.CompareOrdinal(m_currentToken.Code, "of") == 0))
{
operatorContext = m_currentToken.Clone();
GetNextToken();
condOrColl = ParseExpression();
}
else
{
isForIn = false;
}
}
}
else
{
if (JsToken.Semicolon != m_currentToken.Token)
{
bool isLHS;
initializer = ParseUnaryExpression(out isLHS, false);
if (isLHS && (JsToken.In == m_currentToken.Token
|| (m_currentToken.Token == JsToken.Identifier && string.CompareOrdinal(m_currentToken.Code, "of") == 0)))
{
isForIn = true;
operatorContext = m_currentToken.Clone();
lhs = initializer;
initializer = null;
GetNextToken();
m_noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
try
{
condOrColl = ParseExpression();
}
catch (RecoveryTokenException exc)
{
if (IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exc) == -1)
{
exc._partiallyComputedNode = null;
throw;
}
else
{
if (exc._partiallyComputedNode == null)
condOrColl = new JsConstantWrapper(true, JsPrimitiveType.Boolean, CurrentPositionContext(), this); // what could we put here?
else
condOrColl = exc._partiallyComputedNode;
}
if (exc._token == JsToken.RightParenthesis)
{
GetNextToken();
recoveryInForIn = true;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
}
else
{
initializer = ParseExpression(initializer, false, isLHS, JsToken.In);
}
}
}
}
catch (RecoveryTokenException exc)
{
// error is too early abort for
exc._partiallyComputedNode = null;
throw;
}
// at this point we know whether or not is a for..in
if (isForIn)
{
if (!recoveryInForIn)
{
if (JsToken.RightParenthesis != m_currentToken.Token)
ReportError(JsError.NoRightParenthesis);
forCtx.UpdateWith(m_currentToken);
GetNextToken();
}
JsAstNode body = null;
// if the statements aren't withing curly-braces, throw a possible error
if (JsToken.LeftCurly != m_currentToken.Token)
{
ReportError(JsError.StatementBlockExpected, CurrentPositionContext(), true);
}
try
{
// parse a Statement, not a SourceElement
// and ignore any important comments that spring up right here.
body = ParseStatement(false, true);
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode == null)
body = new JsBlock(CurrentPositionContext(), this);
else
body = exc._partiallyComputedNode;
exc._partiallyComputedNode = new JsForIn(forCtx, this)
{
Variable = (lhs != null ? lhs : initializer),
OperatorContext = operatorContext,
Collection = condOrColl,
Body = JsAstNode.ForceToBlock(body),
};
throw;
}
// for (a in b)
// lhs = a, initializer = null
// for (var a in b)
// lhs = null, initializer = var a
forNode = new JsForIn(forCtx, this)
{
Variable = (lhs != null ? lhs : initializer),
OperatorContext = operatorContext,
Collection = condOrColl,
Body = JsAstNode.ForceToBlock(body),
};
}
else
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
try
{
if (JsToken.Semicolon == m_currentToken.Token)
{
separator1Context = m_currentToken.Clone();
}
else
{
ReportError(JsError.NoSemicolon);
if (JsToken.Colon == m_currentToken.Token)
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_VariableDeclNoSkipTokenSet);
try
{
SkipTokensAndThrow();
}
catch (RecoveryTokenException)
{
if (JsToken.Semicolon == m_currentToken.Token)
{
m_useCurrentForNext = false;
}
else
{
throw;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_VariableDeclNoSkipTokenSet);
}
}
}
GetNextToken();
if (JsToken.Semicolon != m_currentToken.Token)
{
condOrColl = ParseExpression();
if (JsToken.Semicolon != m_currentToken.Token)
{
ReportError(JsError.NoSemicolon);
}
}
separator2Context = m_currentToken.Clone();
GetNextToken();
if (JsToken.RightParenthesis != m_currentToken.Token)
{
increment = ParseExpression();
}
if (JsToken.RightParenthesis != m_currentToken.Token)
{
ReportError(JsError.NoRightParenthesis);
}
forCtx.UpdateWith(m_currentToken);
GetNextToken();
}
catch (RecoveryTokenException exc)
{
if (IndexOfToken(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet, exc) == -1)
{
exc._partiallyComputedNode = null;
throw;
}
else
{
// discard any partial info, just genrate empty condition and increment and keep going
exc._partiallyComputedNode = null;
if (condOrColl == null)
condOrColl = new JsConstantWrapper(true, JsPrimitiveType.Boolean, CurrentPositionContext(), this);
}
if (exc._token == JsToken.RightParenthesis)
{
GetNextToken();
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
// if this is an assignment, throw a warning in case the developer
// meant to use == instead of =
// but no warning if the condition is wrapped in parens.
var binOp = condOrColl as JsBinaryOperator;
if (binOp != null && binOp.OperatorToken == JsToken.Assign)
{
condOrColl.Context.HandleError(JsError.SuspectAssignment);
}
JsAstNode body = null;
// if the statements aren't withing curly-braces, throw a possible error
if (JsToken.LeftCurly != m_currentToken.Token)
{
ReportError(JsError.StatementBlockExpected, CurrentPositionContext(), true);
}
try
{
// parse a Statement, not a SourceElement
// and ignore any important comments that spring up right here.
body = ParseStatement(false, true);
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode == null)
body = new JsBlock(CurrentPositionContext(), this);
else
body = exc._partiallyComputedNode;
exc._partiallyComputedNode = new JsForNode(forCtx, this)
{
Initializer = initializer,
Separator1Context = separator1Context,
Condition = condOrColl,
Separator2Context = separator2Context,
Incrementer = increment,
Body = JsAstNode.ForceToBlock(body)
};
throw;
}
forNode = new JsForNode(forCtx, this)
{
Initializer = initializer,
Separator1Context = separator1Context,
Condition = condOrColl,
Separator2Context = separator2Context,
Incrementer = increment,
Body = JsAstNode.ForceToBlock(body)
};
}
}
finally
{
m_blockType.RemoveAt(m_blockType.Count - 1);
}
return forNode;
}
public void Visit(JsLexicalDeclaration node)
{
// not applicable; terminate
}
public void Visit(JsLexicalDeclaration node)
{
if (node != null)
{
var symbol = StartSymbol(node);
// save the no-in state -- we'll reset before processing each initializer
var isNoIn = m_noIn;
Output(OperatorString(node.StatementToken));
MarkSegment(node, null, node.Context);
SetContextOutputPosition(node.Context);
m_startOfStatement = false;
Indent();
var useNewLines = !(node.Parent is JsForNode);
for (var ndx = 0; ndx < node.Count; ++ndx)
{
var decl = node[ndx];
if (decl != null)
{
if (ndx > 0)
{
OutputPossibleLineBreak(',');
if (useNewLines)
{
NewLine();
}
else if (m_settings.OutputMode == MinifierOutputMode.MultipleLines)
{
OutputPossibleLineBreak(' ');
}
}
// be sure to set the no-in state to whatever it was when we entered
// this node, because each declaration might reset it as it's outputting
// its child nodes
m_noIn = isNoIn;
decl.Accept(this);
}
}
Unindent();
EndSymbol(symbol);
}
}
