//---------------------------------------------------------------------------------------
// MemberExpression
//
// Accessor :
// <empty> |
// Arguments Accessor
// '[' Expression ']' Accessor |
// '.' Identifier Accessor |
//
// Don't have this function throwing an exception without checking all the calling sites.
// There is state in instance variable that is saved on the calling stack in some function
// (i.e ParseFunction and ParseClass) and you don't want to blow up the stack
//---------------------------------------------------------------------------------------
private AstNode MemberExpression(AstNode expression, List<Context> newContexts)
{
for (; ; )
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_MemberExprNoSkipTokenSet);
try
{
switch (m_currentToken.Token)
{
case JSToken.LeftParenthesis:
AstNodeList args = null;
RecoveryTokenException callError = null;
m_noSkipTokenSet.Add(NoSkipTokenSet.s_ParenToken);
try
{
args = ParseExpressionList(JSToken.RightParenthesis);
}
catch (RecoveryTokenException exc)
{
args = (AstNodeList)exc._partiallyComputedNode;
if (IndexOfToken(NoSkipTokenSet.s_ParenToken, exc) == -1)
callError = exc; // thrown later on
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_ParenToken);
}
expression = new CallNode(expression.Context.CombineWith(args.Context), this, expression, args, false);
if (null != newContexts && newContexts.Count > 0)
{
(newContexts[newContexts.Count - 1]).UpdateWith(expression.Context);
if (!(expression is CallNode))
expression = new CallNode(newContexts[newContexts.Count - 1], this, expression, new AstNodeList(CurrentPositionContext(), this), false);
else
expression.Context = newContexts[newContexts.Count - 1];
((CallNode)expression).IsConstructor = true;
newContexts.RemoveAt(newContexts.Count - 1);
}
if (callError != null)
{
callError._partiallyComputedNode = expression;
throw callError;
}
GetNextToken();
break;
case JSToken.LeftBracket:
m_noSkipTokenSet.Add(NoSkipTokenSet.s_BracketToken);
try
{
//
// ROTOR parses a[b,c] as a call to a, passing in the arguments b and c.
// the correct parse is a member lookup on a of c -- the "b,c" should be
// a single expression with a comma operator that evaluates b but only
// returns c.
// So we'll change the default behavior from parsing an expression list to
// parsing a single expression, but returning a single-item list (or an empty
// list if there is no expression) so the rest of the code will work.
//
//args = ParseExpressionList(JSToken.RightBracket);
GetNextToken();
args = new AstNodeList(m_currentToken.Clone(), this);
AstNode accessor = ParseExpression();
if (accessor != null)
{
args.Append(accessor);
}
}
catch (RecoveryTokenException exc)
{
if (IndexOfToken(NoSkipTokenSet.s_BracketToken, exc) == -1)
{
if (exc._partiallyComputedNode != null)
{
exc._partiallyComputedNode =
new CallNode(expression.Context.CombineWith(m_currentToken.Clone()), this, expression, (AstNodeList)exc._partiallyComputedNode, true);
}
else
{
exc._partiallyComputedNode = expression;
}
throw;
}
else
args = (AstNodeList)exc._partiallyComputedNode;
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_BracketToken);
}
expression = new CallNode(expression.Context.CombineWith(m_currentToken.Clone()), this, expression, args, true);
// there originally was code here in the ROTOR sources that checked the new context list and
// changed this member call to a constructor call, effectively combining the two. I believe they
// need to remain separate.
// remove the close bracket token
GetNextToken();
break;
case JSToken.AccessField:
ConstantWrapper id = null;
GetNextToken();
if (JSToken.Identifier != m_currentToken.Token)
{
string identifier = JSKeyword.CanBeIdentifier(m_currentToken.Token);
if (null != identifier)
{
// don't report an error here -- it's actually okay to have a property name
// that is a keyword which is okay to be an identifier. For instance,
// jQuery has a commonly-used method named "get" to make an ajax request
//ForceReportInfo(JSError.KeywordUsedAsIdentifier);
id = new ConstantWrapper(identifier, PrimitiveType.String, m_currentToken.Clone(), this);
}
else if (JSScanner.IsValidIdentifier(m_currentToken.Code))
{
// it must be a keyword, because it can't technically be an indentifier,
// but it IS a valid identifier format. Throw the error but still
// create the constant wrapper so we can output it as-is
ReportError(JSError.NoIdentifier, m_currentToken.Clone(), true);
id = new ConstantWrapper(m_currentToken.Code, PrimitiveType.String, m_currentToken.Clone(), this);
}
else
{
ReportError(JSError.NoIdentifier);
SkipTokensAndThrow(expression);
}
}
else
{
id = new ConstantWrapper(m_scanner.GetIdentifier(), PrimitiveType.String, m_currentToken.Clone(), this);
}
GetNextToken();
expression = new Member(expression.Context.CombineWith(id.Context), this, expression, id.Context.Code, id.Context);
break;
default:
if (null != newContexts)
{
while (newContexts.Count > 0)
{
(newContexts[newContexts.Count - 1]).UpdateWith(expression.Context);
expression = new CallNode(newContexts[newContexts.Count - 1],
this,
expression,
new AstNodeList(CurrentPositionContext(), this),
false);
((CallNode)expression).IsConstructor = true;
newContexts.RemoveAt(newContexts.Count - 1);
}
}
return expression;
}
}
catch (RecoveryTokenException exc)
{
if (IndexOfToken(NoSkipTokenSet.s_MemberExprNoSkipTokenSet, exc) != -1)
expression = exc._partiallyComputedNode;
else
{
Debug.Assert(exc._partiallyComputedNode == expression);
throw;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_MemberExprNoSkipTokenSet);
}
}
}
public override void Visit(CallNode node)
{
if (node != null)
{
// see if this is a member (we'll need it for a couple checks)
Member member = node.Function as Member;
if (m_parser.Settings.StripDebugStatements
&& m_parser.Settings.IsModificationAllowed(TreeModifications.StripDebugStatements))
{
// if this is a member, and it's a debugger object, and it's a constructor....
if (member != null && member.IsDebuggerStatement && node.IsConstructor)
{
// we need to replace our debugger object with a generic Object
node.ReplaceChild(node.Function, new Lookup("Object", node.Function.Context, m_parser));
// and make sure the node list is empty
if (node.Arguments != null && node.Arguments.Count > 0)
{
node.ReplaceChild(node.Arguments, new AstNodeList(node.Arguments.Context, m_parser));
}
}
}
// if this is a constructor and we want to collapse
// some of them to literals...
if (node.IsConstructor && m_parser.Settings.CollapseToLiteral)
{
// see if this is a lookup, and if so, if it's pointing to one
// of the two constructors we want to collapse
Lookup lookup = node.Function as Lookup;
if (lookup != null)
{
if (lookup.Name == "Object"
&& m_parser.Settings.IsModificationAllowed(TreeModifications.NewObjectToObjectLiteral))
{
// no arguments -- the Object constructor with no arguments is the exact same as an empty
// object literal
if (node.Arguments == null || node.Arguments.Count == 0)
{
// replace our node with an object literal
ObjectLiteral objLiteral = new ObjectLiteral(node.Context, m_parser, null, null);
if (node.Parent.ReplaceChild(node, objLiteral))
{
// and bail now. No need to recurse -- it's an empty literal
return;
}
}
else if (node.Arguments.Count == 1)
{
// one argument
// check to see if it's an object literal.
ObjectLiteral objectLiteral = node.Arguments[0] as ObjectLiteral;
if (objectLiteral != null)
{
// the Object constructor with an argument that is a JavaScript object merely returns the
// argument. Since the argument is an object literal, it is by definition a JavaScript object
// and therefore we can replace the constructor call with the object literal
node.Parent.ReplaceChild(node, objectLiteral);
// don't forget to recurse the object now
objectLiteral.Accept(this);
// and then bail -- we don't want to process this call
// operation any more; we've gotten rid of it
return;
}
}
}
else if (lookup.Name == "Array"
&& m_parser.Settings.IsModificationAllowed(TreeModifications.NewArrayToArrayLiteral))
{
// Array is trickier.
// If there are no arguments, then just use [].
// if there are multiple arguments, then use [arg0,arg1...argN].
// but if there is one argument and it's numeric, we can't crunch it.
// also can't crunch if it's a function call or a member or something, since we won't
// KNOW whether or not it's numeric.
//
// so first see if it even is a single-argument constant wrapper.
ConstantWrapper constWrapper = (node.Arguments != null && node.Arguments.Count == 1
? node.Arguments[0] as ConstantWrapper
: null);
// if the argument count is not one, then we crunch.
// if the argument count IS one, we only crunch if we have a constant wrapper,
// AND it's not numeric.
if (node.Arguments == null
|| node.Arguments.Count != 1
|| (constWrapper != null && !constWrapper.IsNumericLiteral))
{
// create the new array literal object
ArrayLiteral arrayLiteral = new ArrayLiteral(node.Context, m_parser, node.Arguments);
// replace ourself within our parent
if (node.Parent.ReplaceChild(node, arrayLiteral))
{
// recurse
arrayLiteral.Accept(this);
// and bail -- we don't want to recurse this node any more
return;
}
}
}
}
}
// if we are replacing resource references with strings generated from resource files
// and this is a brackets call: lookup[args]
ResourceStrings resourceStrings = m_parser.ResourceStrings;
if (node.InBrackets && resourceStrings != null && resourceStrings.Count > 0)
{
// see if the root object is a lookup that corresponds to the
// global value (not a local field) for our resource object
// (same name)
Lookup rootLookup = node.Function as Lookup;
if (rootLookup != null
&& rootLookup.LocalField == null
&& string.CompareOrdinal(rootLookup.Name, resourceStrings.Name) == 0)
{
// we're going to replace this node with a string constant wrapper
// but first we need to make sure that this is a valid lookup.
// if the parameter contains anything that would vary at run-time,
// then we need to throw an error.
// the parser will always have either one or zero nodes in the arguments
// arg list. We're not interested in zero args, so just make sure there is one
if (node.Arguments.Count == 1)
{
// must be a constant wrapper
ConstantWrapper argConstant = node.Arguments[0] as ConstantWrapper;
if (argConstant != null)
{
string resourceName = argConstant.Value.ToString();
// get the localized string from the resources object
ConstantWrapper resourceLiteral = new ConstantWrapper(
resourceStrings[resourceName],
PrimitiveType.String,
node.Context,
m_parser);
// replace this node with localized string, analyze it, and bail
// so we don't anaylze the tree we just replaced
node.Parent.ReplaceChild(node, resourceLiteral);
resourceLiteral.Accept(this);
return;
}
else
{
// error! must be a constant
node.Context.HandleError(
JSError.ResourceReferenceMustBeConstant,
true);
}
}
else
{
// error! can only be a single constant argument to the string resource object.
// the parser will only have zero or one arguments, so this must be zero
// (since the parser won't pass multiple args to a [] operator)
node.Context.HandleError(
JSError.ResourceReferenceMustBeConstant,
true);
}
}
}
// and finally, if this is a backets call and the argument is a constantwrapper that can
// be an identifier, just change us to a member node: obj["prop"] to obj.prop.
// but ONLY if the string value is "safe" to be an identifier. Even though the ECMA-262
// spec says certain Unicode categories are okay, in practice the various major browsers
// all seem to have problems with certain characters in identifiers. Rather than risking
// some browsers breaking when we change this syntax, don't do it for those "danger" categories.
if (node.InBrackets && node.Arguments != null)
{
// see if there is a single, constant argument
string argText = node.Arguments.SingleConstantArgument;
if (argText != null)
{
// see if we want to replace the name
string newName;
if (m_parser.Settings.HasRenamePairs && m_parser.Settings.ManualRenamesProperties
&& m_parser.Settings.IsModificationAllowed(TreeModifications.PropertyRenaming)
&& !string.IsNullOrEmpty(newName = m_parser.Settings.GetNewName(argText)))
{
// yes -- we are going to replace the name, either as a string literal, or by converting
// to a member-dot operation.
// See if we can't turn it into a dot-operator. If we can't, then we just want to replace the operator with
// a new constant wrapper. Otherwise we'll just replace the operator with a new constant wrapper.
if (m_parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember)
&& JSScanner.IsSafeIdentifier(newName)
&& !JSScanner.IsKeyword(newName, node.EnclosingScope.UseStrict))
{
// the new name is safe to convert to a member-dot operator.
// but we don't want to convert the node to the NEW name, because we still need to Analyze the
// new member node -- and it might convert the new name to something else. So instead we're
// just going to convert this existing string to a member node WITH THE OLD STRING,
// and THEN analyze it (which will convert the old string to newName)
Member replacementMember = new Member(node.Context, m_parser, node.Function, argText, node.Arguments[0].Context);
node.Parent.ReplaceChild(node, replacementMember);
// this analyze call will convert the old-name member to the newName value
replacementMember.Accept(this);
return;
}
else
{
// nope; can't convert to a dot-operator.
// we're just going to replace the first argument with a new string literal
// and continue along our merry way.
node.Arguments.ReplaceChild(node.Arguments[0], new ConstantWrapper(newName, PrimitiveType.String, node.Arguments[0].Context, m_parser));
}
}
else if (m_parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember)
&& JSScanner.IsSafeIdentifier(argText)
&& !JSScanner.IsKeyword(argText, node.EnclosingScope.UseStrict))
{
// not a replacement, but the string literal is a safe identifier. So we will
// replace this call node with a Member-dot operation
Member replacementMember = new Member(node.Context, m_parser, node.Function, argText, node.Arguments[0].Context);
node.Parent.ReplaceChild(node, replacementMember);
replacementMember.Accept(this);
return;
}
}
}
// call the base class to recurse
base.Visit(node);
// might have changed
member = node.Function as Member;
// call this AFTER recursing to give the fields a chance to resolve, because we only
// want to make this replacement if we are working on the global Date object.
if (!node.InBrackets && !node.IsConstructor
&& (node.Arguments == null || node.Arguments.Count == 0)
&& member != null && string.CompareOrdinal(member.Name, "getTime") == 0
&& m_parser.Settings.IsModificationAllowed(TreeModifications.DateGetTimeToUnaryPlus))
{
// this is not a constructor and it's not a brackets call, and there are no arguments.
// if the function is a member operation to "getTime" and the object of the member is a
// constructor call to the global "Date" object (not a local), then we want to replace the call
// with a unary plus on the Date constructor. Converting to numeric type is the same as
// calling getTime, so it's the equivalent with much fewer bytes.
CallNode dateConstructor = member.Root as CallNode;
if (dateConstructor != null
&& dateConstructor.IsConstructor)
{
// lookup for the predifined (not local) "Date" field
Lookup lookup = dateConstructor.Function as Lookup;
if (lookup != null && string.CompareOrdinal(lookup.Name, "Date") == 0
&& lookup.LocalField == null)
{
// this is in the pattern: (new Date()).getTime()
// we want to replace it with +new Date
// use the same date constructor node as the operand
NumericUnary unary = new NumericUnary(node.Context, m_parser, dateConstructor, JSToken.Plus);
// replace us (the call to the getTime method) with this unary operator
node.Parent.ReplaceChild(node, unary);
// don't need to recurse on the unary operator. The operand has already
// been analyzed when we recursed, and the unary operator wouldn't do anything
// special anyway (since the operand is not a numeric constant)
}
}
}
else
{
var isEval = false;
var lookup = node.Function as Lookup;
if (lookup != null
&& string.CompareOrdinal(lookup.Name, "eval") == 0
&& lookup.VariableField is JSPredefinedField)
{
// call to predefined eval function
isEval = true;
}
else if (member != null && string.CompareOrdinal(member.Name, "eval") == 0)
{
// if this is a window.eval call, then we need to mark this scope as unknown just as
// we would if this was a regular eval call.
// (unless, of course, the parser settings say evals are safe)
// call AFTER recursing so we know the left-hand side properties have had a chance to
// lookup their fields to see if they are local or global
if (member.LeftHandSide.IsWindowLookup)
{
// this is a call to window.eval()
isEval = true;
}
}
else
{
CallNode callNode = node.Function as CallNode;
if (callNode != null
&& callNode.InBrackets
&& callNode.LeftHandSide.IsWindowLookup
&& callNode.Arguments.IsSingleConstantArgument("eval"))
{
// this is a call to window["eval"]
isEval = true;
}
}
if (isEval)
{
if (m_parser.Settings.EvalTreatment != EvalTreatment.Ignore)
{
// mark this scope as unknown so we don't crunch out locals
// we might reference in the eval at runtime
ScopeStack.Peek().IsKnownAtCompileTime = false;
}
}
}
}
}
public override void Visit(Member node)
{
if (node != null)
{
// if we don't even have any resource strings, then there's nothing
// we need to do and we can just perform the base operation
ResourceStrings resourceStrings = m_parser.ResourceStrings;
if (resourceStrings != null && resourceStrings.Count > 0)
{
// see if the root object is a lookup that corresponds to the
// global value (not a local field) for our resource object
// (same name)
Lookup rootLookup = node.Root as Lookup;
if (rootLookup != null
&& rootLookup.LocalField == null
&& string.CompareOrdinal(rootLookup.Name, resourceStrings.Name) == 0)
{
// it is -- we're going to replace this with a string value.
// if this member name is a string on the object, we'll replacve it with
// the literal. Otherwise we'll replace it with an empty string.
// see if the string resource contains this value
ConstantWrapper stringLiteral = new ConstantWrapper(
resourceStrings[node.Name] ?? string.Empty,
PrimitiveType.String,
node.Context,
m_parser
);
node.Parent.ReplaceChild(node, stringLiteral);
// analyze the literal
stringLiteral.Accept(this);
return;
}
}
// if we are replacing property names and we have something to replace
if (m_parser.Settings.HasRenamePairs && m_parser.Settings.ManualRenamesProperties
&& m_parser.Settings.IsModificationAllowed(TreeModifications.PropertyRenaming))
{
// see if this name is a target for replacement
string newName = m_parser.Settings.GetNewName(node.Name);
if (!string.IsNullOrEmpty(newName))
{
// it is -- set the name to the new name
node.Name = newName;
}
}
// check the name of the member for reserved words that aren't allowed
if (JSScanner.IsKeyword(node.Name, ScopeStack.Peek().UseStrict))
{
node.NameContext.HandleError(JSError.KeywordUsedAsIdentifier, true);
}
// recurse
base.Visit(node);
}
}
public void Visit(Member node)
{
ReportError(node);
}
/// <summary>
/// If the new literal is a string literal, then we need to check to see if our
/// parent is a CallNode. If it is, and if the string literal can be an identifier,
/// we'll replace it with a Member-Dot operation.
/// </summary>
/// <param name="newLiteral">newLiteral we intend to replace this binaryop node with</param>
/// <returns>true if we replaced the parent callnode with a member-dot operation</returns>
private bool ReplaceMemberBracketWithDot(BinaryOperator node, ConstantWrapper newLiteral)
{
if (newLiteral.IsStringLiteral)
{
// see if this newly-combined string is the sole argument to a
// call-brackets node. If it is and the combined string is a valid
// identifier (and not a keyword), then we can replace the call
// with a member operator.
// remember that the parent of the argument won't be the call node -- it
// will be the ast node list representing the arguments, whose parent will
// be the node list.
CallNode parentCall = (node.Parent is AstNodeList ? node.Parent.Parent as CallNode : null);
if (parentCall != null && parentCall.InBrackets)
{
// get the newly-combined string
string combinedString = newLiteral.ToString();
// see if this new string is the target of a replacement operation
string newName;
if (m_parser.Settings.HasRenamePairs && m_parser.Settings.ManualRenamesProperties
&& m_parser.Settings.IsModificationAllowed(TreeModifications.PropertyRenaming)
&& !string.IsNullOrEmpty(newName = m_parser.Settings.GetNewName(combinedString)))
{
// yes, it is. Now see if the new name is safe to be converted to a dot-operation.
if (m_parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember)
&& JSScanner.IsSafeIdentifier(newName)
&& !JSScanner.IsKeyword(newName, parentCall.EnclosingScope.UseStrict))
{
// we want to replace the call with operator with a new member dot operation, and
// since we won't be analyzing it (we're past the analyze phase, we're going to need
// to use the new string value
Member replacementMember = new Member(parentCall.Context, m_parser, parentCall.Function, newName, parentCall.Arguments[0].Context);
parentCall.Parent.ReplaceChild(parentCall, replacementMember);
return true;
}
else
{
// nope, can't be changed to a dot-operator for whatever reason.
// just replace the value on this new literal. The old operation will
// get replaced with this new literal
newLiteral.Value = newName;
// and make sure it's type is string
newLiteral.PrimitiveType = PrimitiveType.String;
}
}
else if (m_parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember))
{
// our parent is a call-bracket -- now we just need to see if the newly-combined
// string can be an identifier
if (JSScanner.IsSafeIdentifier(combinedString) && !JSScanner.IsKeyword(combinedString, parentCall.EnclosingScope.UseStrict))
{
// yes -- replace the parent call with a new member node using the newly-combined string
Member replacementMember = new Member(parentCall.Context, m_parser, parentCall.Function, combinedString, parentCall.Arguments[0].Context);
parentCall.Parent.ReplaceChild(parentCall, replacementMember);
return true;
}
}
}
}
return false;
}
public override void Visit(Member node)
{
// same logic for most nodes
TypicalHandler(node);
}
