public void Visit(ForNode node)
{
if (node != null)
{
if (node.Body == null)
{
DoesRequire = false;
}
else
{
node.Body.Accept(this);
}
}
}
public void Visit(ForNode node)
{
// starts with a 'for', so we don't care
}
public override void CleanupNodes()
{
base.CleanupNodes();
// see if the condition is a constant
if (Parser.Settings.EvalLiteralExpressions &&
Parser.Settings.IsModificationAllowed(TreeModifications.EvaluateNumericExpressions))
{
ConstantWrapper constantCondition = Condition as ConstantWrapper;
if (constantCondition != null)
{
// TODO: we'd RATHER eliminate the statement altogether if the condition is always false,
// but we'd need to make sure var'd variables and declared functions are properly handled.
try
{
bool isTrue = constantCondition.ToBoolean();
if (isTrue)
{
// the condition is always true; we should change it to a for(;;) statement.
// less bytes than while(1)
// check to see if we want to combine a preceding var with a for-statement
AstNode initializer = null;
if (Parser.Settings.IsModificationAllowed(TreeModifications.MoveVarIntoFor))
{
// if the previous statement is a var, we can move it to the initializer
// and save even more bytes. The parent should always be a block. If not,
// then assume there is no previous.
Block parentBlock = Parent as Block;
if (parentBlock != null)
{
int whileIndex = parentBlock.StatementIndex(this);
if (whileIndex > 0)
{
Var previousVar = parentBlock[whileIndex - 1] as Var;
if (previousVar != null)
{
initializer = previousVar;
parentBlock.ReplaceChild(previousVar, null);
}
}
}
}
// create the for using our body and replace ourselves with it
ForNode forNode = new ForNode(Context, Parser, initializer, null, null, Body);
Parent.ReplaceChild(this, forNode);
}
else if (constantCondition.IsNotOneOrPositiveZero)
{
// the condition is always false, so we can replace the condition
// with a zero -- only one byte
Condition = new ConstantWrapper(0, PrimitiveType.Number, null, Parser);
}
}
catch (InvalidCastException)
{
// ignore any invalid cast exceptions
}
}
}
}
public void Visit(ForNode node)
{
DebugEx.Fail("shouldn't get here");
}
internal override void AnalyzeNode()
{
// javascript doesn't have block scope, so there really is no point
// in nesting blocks. Unnest any now, before we start combining var statements
UnnestBlocks();
// if we want to remove debug statements...
if (Parser.Settings.StripDebugStatements && Parser.Settings.IsModificationAllowed(TreeModifications.StripDebugStatements))
{
// do it now before we try doing other things
StripDebugStatements();
}
// these variables are used to check for combining a particular type of
// for-statement with preceding var-statements.
ForNode targetForNode = null;
string targetName = null;
// check to see if we want to combine adjacent var statements
bool combineVarStatements = Parser.Settings.IsModificationAllowed(TreeModifications.CombineVarStatements);
// check to see if we want to combine a preceding var with a for-statement
bool moveVarIntoFor = Parser.Settings.IsModificationAllowed(TreeModifications.MoveVarIntoFor);
// look at the statements in the block.
// if there are multiple var statements adjacent to each other, combine them.
// walk BACKWARDS down the list because we'll be removing items when we encounter
// multiple vars.
// we also don't need to check the first one, since there is nothing before it.
for (int ndx = m_list.Count - 1; ndx > 0; --ndx)
{
// if the previous node is not a Var, then we don't need to try and combine
// it withthe current node
Var previousVar = m_list[ndx - 1] as Var;
if (previousVar != null)
{
// see if THIS item is also a Var...
if (m_list[ndx] is Var && combineVarStatements)
{
// add the items in this VAR to the end of the previous
previousVar.Append(m_list[ndx]);
// delete this item from the block
m_list.RemoveAt(ndx);
// if we have a target for-node waiting for another comparison....
if (targetForNode != null)
{
// check to see if the variable we are looking for is in the new list
if (previousVar.Contains(targetName))
{
// IT DOES! we can combine the var statement with the initializer in the for-statement
// we already know it's a binaryop, or it wouldn't be a target for-statement
BinaryOperator binaryOp = targetForNode.Initializer as BinaryOperator;
// create a vardecl that matches our assignment initializer
// ignore duplicates because this scope will already have the variable defined.
VariableDeclaration varDecl = new VariableDeclaration(
binaryOp.Context.Clone(),
Parser,
targetName,
binaryOp.Operand1.Context.Clone(),
binaryOp.Operand2,
0,
true
);
// append it to the preceding var-statement
previousVar.Append(varDecl);
// move the previous vardecl to our initializer
targetForNode.ReplaceChild(targetForNode.Initializer, previousVar);
// and remove the previous var from the list.
m_list.RemoveAt(ndx - 1);
// this will bump the for node up one position in the list, so the next iteration
// will be right back on this node, but the initializer will not be null
// but now we no longer need the target mechanism -- the for-statement is
// not the current node again
targetForNode = null;
}
}
}
else if (moveVarIntoFor)
{
// see if this item is a ForNode
ForNode forNode = m_list[ndx] as ForNode;
if (forNode != null)
{
// and see if the forNode's initializer is empty
if (forNode.Initializer != null)
{
// not empty -- see if it is a Var node
Var varInitializer = forNode.Initializer as Var;
if (varInitializer != null)
{
// we want to PREPEND the initializers in the previous var statement
// to our for-statement's initializer list
varInitializer.InsertAt(0, previousVar);
// then remove the previous var statement
m_list.RemoveAt(ndx - 1);
// this will bump the for node up one position in the list, so the next iteration
// will be right back on this node in case there are other var statements we need
// to combine
}
else
{
// see if the initializer is a simple assignment
BinaryOperator binaryOp = forNode.Initializer as BinaryOperator;
if (binaryOp != null && binaryOp.OperatorToken == JSToken.Assign)
{
// it is. See if it's a simple lookup
Lookup lookup = binaryOp.Operand1 as Lookup;
if (lookup != null)
{
// it is. see if that variable is in the previous var statement
if (previousVar.Contains(lookup.Name))
{
// create a vardecl that matches our assignment initializer
// ignore duplicates because this scope will already have the variable defined.
VariableDeclaration varDecl = new VariableDeclaration(
binaryOp.Context.Clone(),
Parser,
lookup.Name,
lookup.Context.Clone(),
binaryOp.Operand2,
0,
true
);
// append it to the var statement before us
previousVar.Append(varDecl);
// move the previous vardecl to our initializer
forNode.ReplaceChild(forNode.Initializer, previousVar);
// and remove the previous var from the list.
m_list.RemoveAt(ndx - 1);
// this will bump the for node up one position in the list, so the next iteration
// will be right back on this node, but the initializer will not be null
}
else
{
// it's not in the immediately preceding var-statement, but that doesn't mean it won't be in
// a var-statement immediately preceding that one -- in which case they'll get combined and
// then it WILL be in the immediately preceding var-statement. So hold on to this
// for statement and we'll check after we do a combine.
targetForNode = forNode;
targetName = lookup.Name;
}
}
}
}
}
else
{
// if it's empty, then we're free to add the previous var statement
// to this for statement's initializer. remove it from it's current
// position and add it as the initializer
m_list.RemoveAt(ndx - 1);
forNode.ReplaceChild(forNode.Initializer, previousVar);
// this will bump the for node up one position in the list, so the next iteration
// will be right back on this node, but the initializer will not be null
}
}
}
}
else
{
// not a var statement. make sure the target for-node is cleared.
targetForNode = null;
ConditionalCompilationComment previousComment = m_list[ndx - 1] as ConditionalCompilationComment;
if (previousComment != null)
{
ConditionalCompilationComment thisComment = m_list[ndx] as ConditionalCompilationComment;
if (thisComment != null)
{
// two adjacent conditional comments -- combine them into the first.
// this will actually make the second block a nested block within the first block,
// but they'll be flattened when the comment's block gets recursed.
previousComment.Statements.Append(thisComment.Statements);
// and remove the second one (which is now a duplicate)
m_list.RemoveAt(ndx);
}
}
}
}
if (m_blockScope != null)
{
ScopeStack.Push(m_blockScope);
}
try
{
// call the base class to recurse
base.AnalyzeNode();
}
finally
{
if (m_blockScope != null)
{
ScopeStack.Pop();
}
}
// NOW that we've recursively analyzed all the child nodes in this block, let's see
// if we can further reduce the statements by checking for a couple good opportunities
if (Parser.Settings.RemoveUnneededCode)
{
// Transform: {var foo=expression;return foo;} to: {return expression;}
if (m_list.Count == 2 && Parser.Settings.IsModificationAllowed(TreeModifications.VarInitializeReturnToReturnInitializer))
{
Var varStatement = m_list[0] as Var;
ReturnNode returnStatement = m_list[1] as ReturnNode;
// see if we have two statements in our block: a var with a single declaration, and a return
if (returnStatement != null && varStatement != null &&
varStatement.Count == 1 && varStatement[0].Initializer != null)
{
// now see if the return is returning a lookup for the same var we are declaring in the
// previous statement
Lookup lookup = returnStatement.Operand as Lookup;
if (lookup != null &&
string.Compare(lookup.Name, varStatement[0].Identifier, StringComparison.Ordinal) == 0)
{
// it's a match!
// create a combined context starting with the var and adding in the return
Context context = varStatement.Context.Clone();
context.UpdateWith(returnStatement.Context);
// create a new return statement
ReturnNode newReturn = new ReturnNode(context, Parser, varStatement[0].Initializer);
// clear out the existing statements
m_list.Clear();
// and add our new one
Append(newReturn);
}
}
}
// we do things differently if these statements are the last in a function
// because we can assume the implicit return
bool isFunctionLevel = (Parent is FunctionObject);
// see if we want to change if-statement that forces a return to a return conditional
if (Parser.Settings.IsModificationAllowed(TreeModifications.IfElseReturnToReturnConditional))
{
// transform: {...; if(cond1)return;} to {...;cond;}
// transform: {...; if(cond1)return exp1;else return exp2;} to {...;return cond1?exp1:exp2;}
if (m_list.Count >= 1)
{
// see if the last statement is an if-statement with a true-block containing only one statement
IfNode ifStatement = m_list[m_list.Count - 1] as IfNode;
if (ifStatement != null &&
ifStatement.TrueBlock != null)
{
// see if this if-statement is structured such that we can convert it to a
// Conditional node that is the operand of a return statement
Conditional returnOperand = ifStatement.CanBeReturnOperand(null, isFunctionLevel);
if (returnOperand != null)
{
// it can! change it.
ReturnNode returnNode = new ReturnNode(
(Context == null ? null : Context.Clone()),
Parser,
returnOperand);
// replace the if-statement with the return statement
ReplaceChild(ifStatement, returnNode);
}
}
// else last statement is not an if-statement, or true block is not a single statement
}
// transform: {...; if(cond1)return exp1;return exp2;} to {...; return cond1?exp1:exp2;}
// my cascade! changing the two statements to a return may cause us to run this again if the
// third statement up becomes the penultimate and is an if-statement
while (m_list.Count > 1)
{
int lastIndex = m_list.Count - 1;
// end in a return statement?
ReturnNode finalReturn = m_list[lastIndex] as ReturnNode;
if (finalReturn != null)
{
// it does -- see if the penultimate statement is an if-block
IfNode ifNode = m_list[lastIndex - 1] as IfNode;
if (ifNode != null)
{
// if followed by return. See if the if statement can be changed to a
// return of a conditional, using the operand of the following return
// as the ultimate expression
Conditional returnConditional = ifNode.CanBeReturnOperand(finalReturn.Operand, isFunctionLevel);
if (returnConditional != null)
{
// it can! so create the new return statement.
// the context of this new return statement should start with a clone of
// the if-statement and updated with the return statement
Context context = ifNode.Context.Clone();
context.UpdateWith(finalReturn.Context);
// create the new return node
ReturnNode newReturn = new ReturnNode(
context,
Parser,
returnConditional);
// remove the last node (the old return)
m_list.RemoveAt(lastIndex--);
// and replace the if-statement with the new return
m_list[lastIndex] = newReturn;
newReturn.Parent = this;
// we collapsed the last two statements, and we KNOW the last one is a
// return -- go back up to the top of the loop to see if we can keep going.
continue;
}
}
}
// if we get here, then something went wrong, we didn't collapse the last
// two statements, so break out of the loop
break;
}
// now we may have converted the last functional statement
// from if(cond)return expr to return cond?expr:void 0, which is four
// extra bytes. So let's check to see if the last statement in the function
// now fits this pattern, and if so, change it back.
// We didn't just NOT change it in the first place because changing it could've
// enabled even more changes that would save a lot more space. But apparently
// those subsequent changes didn't pan out.
if (m_list.Count >= 1)
{
int lastIndex = m_list.Count - 1;
ReturnNode returnNode = m_list[lastIndex] as ReturnNode;
if (returnNode != null)
{
Conditional conditional = returnNode.Operand as Conditional;
if (conditional != null)
{
VoidNode falseVoid = conditional.FalseExpression as VoidNode;
if (falseVoid != null && falseVoid.Operand is ConstantWrapper)
{
// we have the required pattern: "return cond?expr:void 0"
// (well, the object of the void is a constant, at least).
// undo it back to "if(cond)return expr" because that takes fewer bytes.
// by default, the operand of the return operator will be the
// true branch of the conditional
AstNode returnOperand = conditional.TrueExpression;
VoidNode trueVoid = conditional.TrueExpression as VoidNode;
if (trueVoid != null && trueVoid.Operand is ConstantWrapper)
{
// the true branch of the conditional is a void operator acting
// on a constant! So really, there is no operand to the return statement
returnOperand = null;
if (Parser.Settings.IsModificationAllowed(TreeModifications.IfConditionReturnToCondition))
{
// actually, we have return cond?void 0:void 0,
// which would get changed back to function{...;if(cond)return}
// BUT we can just shorten it to function{...;cond}
m_list[lastIndex] = conditional.Condition;
conditional.Condition.Parent = this;
return;
}
}
IfNode ifNode = new IfNode(
returnNode.Context.Clone(),
Parser,
conditional.Condition,
new ReturnNode(returnNode.Context.Clone(), Parser, returnOperand),
null);
m_list[lastIndex] = ifNode;
ifNode.Parent = this;
}
}
}
}
}
}
}
//---------------------------------------------------------------------------------------
// ParseForStatement
//
// ForStatement :
// 'for' '(' OptionalExpressionNoIn ';' OptionalExpression ';' OptionalExpression ')'
// 'for' '(' 'var' VariableDeclarationListNoIn ';' OptionalExpression ';' OptionalExpression ')'
// 'for' '(' LeftHandSideExpression 'in' Expression')'
// 'for' '(' 'var' Identifier OptionalInitializerNoIn 'in' Expression')'
//
// OptionalExpressionNoIn :
// <empty> |
// ExpressionNoIn // same as Expression but does not process 'in' as an operator
//
// OptionalInitializerNoIn :
// <empty> |
// InitializerNoIn // same as initializer but does not process 'in' as an operator
//---------------------------------------------------------------------------------------
private AstNode ParseForStatement()
{
m_blockType.Add(BlockType.Loop);
AstNode forNode = null;
try
{
Context forCtx = m_currentToken.Clone();
GetNextToken();
if (JSToken.LeftParenthesis != m_currentToken.Token)
ReportError(JSError.NoLeftParenthesis);
GetNextToken();
bool isForIn = false, recoveryInForIn = false;
AstNode lhs = null, initializer = null, condOrColl = null, increment = null;
try
{
if (JSToken.Var == m_currentToken.Token)
{
isForIn = true;
Var varList = new Var(m_currentToken.Clone(), this);
varList.Append(ParseIdentifierInitializer(JSToken.In, (FieldAttributes)0));
// a list of variable initializers is allowed only in a for(;;)
while (JSToken.Comma == m_currentToken.Token)
{
isForIn = false;
varList.Append(ParseIdentifierInitializer(JSToken.In, (FieldAttributes)0));
//initializer = new Comma(initializer.context.CombineWith(var.context), initializer, var);
}
initializer = varList;
// if it could still be a for..in, now it's time to get the 'in'
if (isForIn)
{
if (JSToken.In == m_currentToken.Token)
{
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)
{
isForIn = true;
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 ConstantWrapper(true, PrimitiveType.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();
}
AstNode body = null;
// if the statements aren't withing curly-braces, throw a possible error
if (JSToken.LeftCurly != m_currentToken.Token)
{
ReportError(JSError.StatementBlockExpected, forCtx, true);
}
try
{
// parse a Statement, not a SourceElement
body = ParseStatement(false);
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode == null)
body = new Block(CurrentPositionContext(), this);
else
body = exc._partiallyComputedNode;
exc._partiallyComputedNode = new ForIn(forCtx, this, (lhs != null ? lhs : initializer), condOrColl, body);
throw;
}
// for (a in b)
// lhs = a, initializer = null
// for (var a in b)
// lhs = null, initializer = var a
forNode = new ForIn(forCtx, this, (lhs != null ? lhs : initializer), condOrColl, body);
}
else
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
try
{
if (JSToken.Semicolon != m_currentToken.Token)
{
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_errorToken = null;
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);
}
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 ConstantWrapper(true, PrimitiveType.Boolean, CurrentPositionContext(), this);
}
if (exc._token == JSToken.RightParenthesis)
{
GetNextToken();
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_BlockConditionNoSkipTokenSet);
}
AstNode body = null;
// if the statements aren't withing curly-braces, throw a possible error
if (JSToken.LeftCurly != m_currentToken.Token)
{
ReportError(JSError.StatementBlockExpected, forCtx, true);
}
try
{
// parse a Statement, not a SourceElement
body = ParseStatement(false);
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode == null)
body = new Block(CurrentPositionContext(), this);
else
body = exc._partiallyComputedNode;
exc._partiallyComputedNode = new ForNode(forCtx, this, initializer, condOrColl, increment, body);
throw;
}
forNode = new ForNode(forCtx, this, initializer, condOrColl, increment, body);
}
}
finally
{
m_blockType.RemoveAt(m_blockType.Count - 1);
}
return forNode;
}
public override void Visit(ForNode node)
{
if (node != null)
{
// if we are stripping debugger statements and the body is
// just a debugger statement, replace it with a null
if (m_parser.Settings.StripDebugStatements
&& m_parser.Settings.IsModificationAllowed(TreeModifications.StripDebugStatements)
&& node.Body != null
&& node.Body.IsDebuggerStatement)
{
node.ReplaceChild(node.Body, null);
}
// recurse
base.Visit(node);
// if the body is now empty, make it null
if (node.Body != null && node.Body.Count == 0)
{
node.ReplaceChild(node.Body, null);
}
}
}
public void Visit(ForNode node)
{
ReportError(node);
}
public void Visit(ForNode node)
{
// invalid! ignore
IsValid = false;
}
public override void Visit(WhileNode node)
{
if (node != null)
{
// depth-first
base.Visit(node);
// see if the condition is a constant
if (m_parser.Settings.IsModificationAllowed(TreeModifications.EvaluateNumericExpressions))
{
ConstantWrapper constantCondition = node.Condition as ConstantWrapper;
if (constantCondition != null)
{
// TODO: (someday) we'd RATHER eliminate the statement altogether if the condition is always false,
// but we'd need to make sure var'd variables and declared functions are properly handled.
try
{
bool isTrue = constantCondition.ToBoolean();
if (isTrue)
{
// the condition is always true; we should change it to a for(;;) statement.
// less bytes than while(1)
// check to see if we want to combine a preceding var with a for-statement
AstNode initializer = null;
if (m_parser.Settings.IsModificationAllowed(TreeModifications.MoveVarIntoFor))
{
// if the previous statement is a var, we can move it to the initializer
// and save even more bytes. The parent should always be a block. If not,
// then assume there is no previous.
Block parentBlock = node.Parent as Block;
if (parentBlock != null)
{
int whileIndex = parentBlock.StatementIndex(node);
if (whileIndex > 0)
{
Var previousVar = parentBlock[whileIndex - 1] as Var;
if (previousVar != null)
{
initializer = previousVar;
parentBlock.ReplaceChild(previousVar, null);
}
}
}
}
// create the for using our body and replace ourselves with it
ForNode forNode = new ForNode(node.Context, m_parser, initializer, null, null, node.Body);
node.Parent.ReplaceChild(node, forNode);
}
else if (constantCondition.IsNotOneOrPositiveZero)
{
// the condition is always false, so we can replace the condition
// with a zero -- only one byte
node.ReplaceChild(node.Condition, new ConstantWrapper(0, PrimitiveType.Number, null, m_parser));
}
}
catch (InvalidCastException)
{
// ignore any invalid cast exceptions
}
}
}
}
}
public override void Visit(ForNode node)
{
if (node != null)
{
// depth-first
base.Visit(node);
if (m_parser.Settings.IsModificationAllowed(TreeModifications.EvaluateNumericExpressions))
{
ConstantWrapper constantCondition = node.Condition as ConstantWrapper;
if (constantCondition != null)
{
try
{
// if condition is always false, change it to a zero (only one byte)
// and if it is always true, remove it (default behavior)
if (constantCondition.ToBoolean())
{
// always true -- don't need a condition at all
node.ReplaceChild(node.Condition, null);
}
else if (constantCondition.IsNotOneOrPositiveZero)
{
// always false and it's not already a zero. Make it so (only one byte)
node.ReplaceChild(node.Condition, new ConstantWrapper(0, PrimitiveType.Number, node.Condition.Context, m_parser));
}
}
catch (InvalidCastException)
{
// ignore any invalid cast exceptions
}
}
}
}
}
