public void Visit(JsArrayLiteral node)
{
if (node != null)
{
if (node.Elements != null)
{
node.Elements.Accept(this);
}
node.Index = NextOrderIndex;
}
}
public void Visit(JsArrayLiteral node)
{
if (node != null)
{
m_writer.Write('[');
if (node.Elements != null)
{
node.Elements.Accept(this);
}
m_writer.Write(']');
}
}
public void Visit(JsArrayLiteral node)
{
if (node != null)
{
m_writer.Write('[');
if (node.Elements != null)
{
node.Elements.Accept(this);
}
m_writer.Write(']');
}
}
public void Visit(JsArrayLiteral node)
{
// starts with a '[', so we don't care
}
public void Visit(JsArrayLiteral node)
{
// not applicable; terminate
}
public void Visit(JsArrayLiteral node)
{
if (node != null)
{
if (node.Elements != null)
{
node.Elements.Accept(this);
}
node.Index = NextOrderIndex;
}
}
public void Visit(JsArrayLiteral node)
{
// don't recurse; we don't need parens around this
}
private JsAstNode ParseLeftHandSideExpression(bool isMinus)
{
JsAstNode ast = null;
bool skipToken = true;
List<JsContext> newContexts = null;
TryItAgain:
// new expression
while (JsToken.New == m_currentToken.Token)
{
if (null == newContexts)
newContexts = new List<JsContext>(4);
newContexts.Add(m_currentToken.Clone());
GetNextToken();
}
JsToken token = m_currentToken.Token;
switch (token)
{
// primary expression
case JsToken.Identifier:
ast = new JsLookup(m_currentToken.Clone(), this)
{
Name = m_scanner.Identifier
};
break;
case JsToken.ConditionalCommentStart:
// skip past the start to the next token
GetNextToken();
if (m_currentToken.Token == JsToken.ConditionalCompilationVariable)
{
// we have /*@id
ast = new JsConstantWrapperPP(m_currentToken.Clone(), this)
{
VarName = m_currentToken.Code,
ForceComments = true
};
GetNextToken();
if (m_currentToken.Token == JsToken.ConditionalCommentEnd)
{
// skip past the closing comment
GetNextToken();
}
else
{
// we ONLY support /*@id@*/ in expressions right now. If there's not
// a closing comment after the ID, then we don't support it.
// throw an error, skip to the end of the comment, then ignore it and start
// looking for the next token.
CCTooComplicated(null);
goto TryItAgain;
}
}
else if (m_currentToken.Token == JsToken.ConditionalCommentEnd)
{
// empty conditional comment! Ignore.
GetNextToken();
goto TryItAgain;
}
else
{
// we DON'T have "/*@IDENT". We only support "/*@IDENT @*/", so since this isn't
// and id, throw the error, skip to the end of the comment, and ignore it
// by looping back and looking for the NEXT token.
m_currentToken.HandleError(JsError.ConditionalCompilationTooComplex);
// skip to end of conditional comment
while (m_currentToken.Token != JsToken.EndOfFile && m_currentToken.Token != JsToken.ConditionalCommentEnd)
{
GetNextToken();
}
GetNextToken();
goto TryItAgain;
}
break;
case JsToken.This:
ast = new JsThisLiteral(m_currentToken.Clone(), this);
break;
case JsToken.StringLiteral:
ast = new JsConstantWrapper(m_scanner.StringLiteralValue, JsPrimitiveType.String, m_currentToken.Clone(), this)
{
MayHaveIssues = m_scanner.LiteralHasIssues
};
break;
case JsToken.IntegerLiteral:
case JsToken.NumericLiteral:
{
JsContext numericContext = m_currentToken.Clone();
double doubleValue;
if (ConvertNumericLiteralToDouble(m_currentToken.Code, (token == JsToken.IntegerLiteral), out doubleValue))
{
// conversion worked fine
// check for some boundary conditions
var mayHaveIssues = m_scanner.LiteralHasIssues;
if (doubleValue == double.MaxValue)
{
ReportError(JsError.NumericMaximum, numericContext, true);
}
else if (isMinus && -doubleValue == double.MinValue)
{
ReportError(JsError.NumericMinimum, numericContext, true);
}
// create the constant wrapper from the value
ast = new JsConstantWrapper(doubleValue, JsPrimitiveType.Number, numericContext, this)
{
MayHaveIssues = mayHaveIssues
};
}
else
{
// if we went overflow or are not a number, then we will use the "Other"
// primitive type so we don't try doing any numeric calcs with it.
if (double.IsInfinity(doubleValue))
{
// overflow
// and if we ARE an overflow, report it
ReportError(JsError.NumericOverflow, numericContext, true);
}
// regardless, we're going to create a special constant wrapper
// that simply echos the input as-is
ast = new JsConstantWrapper(m_currentToken.Code, JsPrimitiveType.Other, numericContext, this)
{
MayHaveIssues = true
};
}
break;
}
case JsToken.True:
ast = new JsConstantWrapper(true, JsPrimitiveType.Boolean, m_currentToken.Clone(), this);
break;
case JsToken.False:
ast = new JsConstantWrapper(false, JsPrimitiveType.Boolean, m_currentToken.Clone(), this);
break;
case JsToken.Null:
ast = new JsConstantWrapper(null, JsPrimitiveType.Null, m_currentToken.Clone(), this);
break;
case JsToken.ConditionalCompilationVariable:
ast = new JsConstantWrapperPP(m_currentToken.Clone(), this)
{
VarName = m_currentToken.Code,
ForceComments = false
};
break;
case JsToken.DivideAssign:
// normally this token is not allowed on the left-hand side of an expression.
// BUT, this might be the start of a regular expression that begins with an equals sign!
// we need to test to see if we can parse a regular expression, and if not, THEN
// we can fail the parse.
case JsToken.Divide:
// could it be a regexp?
ast = ScanRegularExpression();
if (ast != null)
{
// yup -- we're done here
break;
}
// nope -- go to the default branch
goto default;
// expression
case JsToken.LeftParenthesis:
{
var groupingOp = new JsGroupingOperator(m_currentToken.Clone(), this);
ast = groupingOp;
GetNextToken();
m_noSkipTokenSet.Add(NoSkipTokenSet.s_ParenExpressionNoSkipToken);
try
{
// parse an expression
groupingOp.Operand = ParseExpression();
if (JsToken.RightParenthesis != m_currentToken.Token)
{
ReportError(JsError.NoRightParenthesis);
}
else
{
// add the closing paren to the expression context
ast.Context.UpdateWith(m_currentToken);
}
}
catch (RecoveryTokenException exc)
{
if (IndexOfToken(NoSkipTokenSet.s_ParenExpressionNoSkipToken, exc) == -1)
throw;
else
groupingOp.Operand = exc._partiallyComputedNode;
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_ParenExpressionNoSkipToken);
}
}
break;
// array initializer
case JsToken.LeftBracket:
JsContext listCtx = m_currentToken.Clone();
GetNextToken();
JsAstNodeList list = new JsAstNodeList(CurrentPositionContext(), this);
var hasTrailingCommas = false;
while (JsToken.RightBracket != m_currentToken.Token)
{
if (JsToken.Comma != m_currentToken.Token)
{
m_noSkipTokenSet.Add(NoSkipTokenSet.s_ArrayInitNoSkipTokenSet);
try
{
var expression = ParseExpression(true);
list.Append(expression);
if (JsToken.Comma != m_currentToken.Token)
{
if (JsToken.RightBracket != m_currentToken.Token)
{
ReportError(JsError.NoRightBracket);
}
break;
}
else
{
// we have a comma -- skip it after adding it as a terminator
// on the previous expression
var commaContext = m_currentToken.Clone();
expression.IfNotNull(e => e.TerminatingContext = commaContext);
GetNextToken();
// if the next token is the closing brackets, then we need to
// add a missing value to the array because we end in a comma and
// we need to keep it for cross-platform compat.
// TECHNICALLY, that puts an extra item into the array for most modern browsers, but not ALL.
if (m_currentToken.Token == JsToken.RightBracket)
{
hasTrailingCommas = true;
list.Append(new JsConstantWrapper(JsMissing.Value, JsPrimitiveType.Other, m_currentToken.Clone(), this));
// throw a cross-browser warning about trailing commas
commaContext.HandleError(JsError.ArrayLiteralTrailingComma);
break;
}
}
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode != null)
list.Append(exc._partiallyComputedNode);
if (IndexOfToken(NoSkipTokenSet.s_ArrayInitNoSkipTokenSet, exc) == -1)
{
listCtx.UpdateWith(CurrentPositionContext());
exc._partiallyComputedNode = new JsArrayLiteral(listCtx, this)
{
Elements = list,
MayHaveIssues = true
};
throw;
}
else
{
if (JsToken.RightBracket == m_currentToken.Token)
break;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_ArrayInitNoSkipTokenSet);
}
}
else
{
// comma -- missing array item in the list
var commaContext = m_currentToken.Clone();
list.Append(new JsConstantWrapper(JsMissing.Value, JsPrimitiveType.Other, m_currentToken.Clone(), this)
{
TerminatingContext = commaContext
});
// skip over the comma
GetNextToken();
// if the next token is the closing brace, then we end with a comma -- and we need to
// add ANOTHER missing value to make sure this last comma doesn't get left off.
// TECHNICALLY, that puts an extra item into the array for most modern browsers, but not ALL.
if (m_currentToken.Token == JsToken.RightBracket)
{
hasTrailingCommas = true;
list.Append(new JsConstantWrapper(JsMissing.Value, JsPrimitiveType.Other, m_currentToken.Clone(), this));
// throw a cross-browser warning about trailing commas
commaContext.HandleError(JsError.ArrayLiteralTrailingComma);
break;
}
}
}
listCtx.UpdateWith(m_currentToken);
ast = new JsArrayLiteral(listCtx, this)
{
Elements = list,
MayHaveIssues = hasTrailingCommas
};
break;
// object initializer
case JsToken.LeftCurly:
JsContext objCtx = m_currentToken.Clone();
GetNextToken();
var propertyList = new JsAstNodeList(CurrentPositionContext(), this);
if (JsToken.RightCurly != m_currentToken.Token)
{
for (; ; )
{
JsObjectLiteralField field = null;
JsAstNode value = null;
bool getterSetter = false;
string ident;
switch (m_currentToken.Token)
{
case JsToken.Identifier:
field = new JsObjectLiteralField(m_scanner.Identifier, JsPrimitiveType.String, m_currentToken.Clone(), this);
break;
case JsToken.StringLiteral:
field = new JsObjectLiteralField(m_scanner.StringLiteralValue, JsPrimitiveType.String, m_currentToken.Clone(), this)
{
MayHaveIssues = m_scanner.LiteralHasIssues
};
break;
case JsToken.IntegerLiteral:
case JsToken.NumericLiteral:
{
double doubleValue;
if (ConvertNumericLiteralToDouble(m_currentToken.Code, (m_currentToken.Token == JsToken.IntegerLiteral), out doubleValue))
{
// conversion worked fine
field = new JsObjectLiteralField(
doubleValue,
JsPrimitiveType.Number,
m_currentToken.Clone(),
this
);
}
else
{
// something went wrong and we're not sure the string representation in the source is
// going to convert to a numeric value well
if (double.IsInfinity(doubleValue))
{
ReportError(JsError.NumericOverflow, m_currentToken.Clone(), true);
}
// use the source as the field name, not the numeric value
field = new JsObjectLiteralField(
m_currentToken.Code,
JsPrimitiveType.Other,
m_currentToken.Clone(),
this);
}
break;
}
case JsToken.Get:
case JsToken.Set:
if (PeekToken() == JsToken.Colon)
{
// the field is either "get" or "set" and isn't the special Mozilla getter/setter
field = new JsObjectLiteralField(m_currentToken.Code, JsPrimitiveType.String, m_currentToken.Clone(), this);
}
else
{
// ecma-script get/set property construct
getterSetter = true;
bool isGet = (m_currentToken.Token == JsToken.Get);
value = ParseFunction(
(JsToken.Get == m_currentToken.Token ? JsFunctionType.Getter : JsFunctionType.Setter),
m_currentToken.Clone()
);
JsFunctionObject funcExpr = value as JsFunctionObject;
if (funcExpr != null)
{
// getter/setter is just the literal name with a get/set flag
field = new JsGetterSetter(
funcExpr.Name,
isGet,
funcExpr.IdContext.Clone(),
this
);
}
else
{
ReportError(JsError.FunctionExpressionExpected);
}
}
break;
default:
// NOT: identifier token, string, number, or getter/setter.
// see if it's a token that COULD be an identifierName.
ident = m_scanner.Identifier;
if (JsScanner.IsValidIdentifier(ident))
{
// BY THE SPEC, if it's a valid identifierName -- which includes reserved words -- then it's
// okay for object literal syntax. However, reserved words here won't work in all browsers,
// so if it is a reserved word, let's throw a low-sev cross-browser warning on the code.
if (JsKeyword.CanBeIdentifier(m_currentToken.Token) == null)
{
ReportError(JsError.ObjectLiteralKeyword, m_currentToken.Clone(), true);
}
field = new JsObjectLiteralField(ident, JsPrimitiveType.String, m_currentToken.Clone(), this);
}
else
{
// throw an error but use it anyway, since that's what the developer has going on
ReportError(JsError.NoMemberIdentifier, m_currentToken.Clone(), true);
field = new JsObjectLiteralField(m_currentToken.Code, JsPrimitiveType.String, m_currentToken.Clone(), this);
}
break;
}
if (field != null)
{
if (!getterSetter)
{
GetNextToken();
}
m_noSkipTokenSet.Add(NoSkipTokenSet.s_ObjectInitNoSkipTokenSet);
try
{
if (!getterSetter)
{
// get the value
if (JsToken.Colon != m_currentToken.Token)
{
ReportError(JsError.NoColon, true);
value = ParseExpression(true);
}
else
{
field.ColonContext = m_currentToken.Clone();
GetNextToken();
value = ParseExpression(true);
}
}
// put the pair into the list of fields
var propCtx = field.Context.Clone().CombineWith(value.IfNotNull(v => v.Context));
var property = new JsObjectLiteralProperty(propCtx, this)
{
Name = field,
Value = value
};
propertyList.Append(property);
if (JsToken.RightCurly == m_currentToken.Token)
{
break;
}
else
{
if (JsToken.Comma == m_currentToken.Token)
{
// skip the comma after adding it to the property as a terminating context
property.IfNotNull(p => p.TerminatingContext = m_currentToken.Clone());
GetNextToken();
// if the next token is the right-curly brace, then we ended
// the list with a comma, which is perfectly fine
if (m_currentToken.Token == JsToken.RightCurly)
{
break;
}
}
else
{
if (m_foundEndOfLine)
{
ReportError(JsError.NoRightCurly);
}
else
ReportError(JsError.NoComma, true);
SkipTokensAndThrow();
}
}
}
catch (RecoveryTokenException exc)
{
if (exc._partiallyComputedNode != null)
{
// the problem was in ParseExpression trying to determine value
value = exc._partiallyComputedNode;
var propCtx = field.Context.Clone().CombineWith(value.IfNotNull(v => v.Context));
var property = new JsObjectLiteralProperty(propCtx, this)
{
Name = field,
Value = value
};
propertyList.Append(property);
}
if (IndexOfToken(NoSkipTokenSet.s_ObjectInitNoSkipTokenSet, exc) == -1)
{
exc._partiallyComputedNode = new JsObjectLiteral(objCtx, this)
{
Properties = propertyList
};
throw;
}
else
{
if (JsToken.Comma == m_currentToken.Token)
GetNextToken();
if (JsToken.RightCurly == m_currentToken.Token)
break;
}
}
finally
{
m_noSkipTokenSet.Remove(NoSkipTokenSet.s_ObjectInitNoSkipTokenSet);
}
}
}
}
objCtx.UpdateWith(m_currentToken);
ast = new JsObjectLiteral(objCtx, this)
{
Properties = propertyList
};
break;
// function expression
case JsToken.Function:
ast = ParseFunction(JsFunctionType.Expression, m_currentToken.Clone());
skipToken = false;
break;
case JsToken.AspNetBlock:
ast = new JsAspNetBlockNode(m_currentToken.Clone(), this)
{
AspNetBlockText = m_currentToken.Code
};
break;
default:
string identifier = JsKeyword.CanBeIdentifier(m_currentToken.Token);
if (null != identifier)
{
ast = new JsLookup(m_currentToken.Clone(), this)
{
Name = identifier
};
}
else
{
ReportError(JsError.ExpressionExpected);
SkipTokensAndThrow();
}
break;
}
// can be a CallExpression, that is, followed by '.' or '(' or '['
if (skipToken)
GetNextToken();
return MemberExpression(ast, newContexts);
}
public void Visit(JsArrayLiteral node)
{
// don't recurse; we don't need parens around this
}
public void Visit(JsArrayLiteral node)
{
var isNoIn = m_noIn;
m_noIn = false;
if (node != null)
{
var symbol = StartSymbol(node);
OutputPossibleLineBreak('[');
MarkSegment(node, null, node.Context);
SetContextOutputPosition(node.Context);
m_startOfStatement = false;
if (node.Elements.Count > 0)
{
Indent();
JsAstNode element = null;
for (var ndx = 0; ndx < node.Elements.Count; ++ndx)
{
if (ndx > 0)
{
OutputPossibleLineBreak(',');
MarkSegment(node, null, element.IfNotNull(e => e.TerminatingContext));
if (m_settings.OutputMode == MinifierOutputMode.MultipleLines)
{
OutputPossibleLineBreak(' ');
}
}
element = node.Elements[ndx];
if (element != null)
{
AcceptNodeWithParens(element, element.Precedence == JsOperatorPrecedence.Comma);
}
}
Unindent();
}
Output(']');
MarkSegment(node, null, node.Context);
EndSymbol(symbol);
}
m_noIn = isNoIn;
}
public void Visit(JsArrayLiteral node)
{
// not applicable; terminate
}
public override void Visit(JsArrayLiteral node)
{
// same logic for most nodes
TypicalHandler(node);
}
public override void Visit(JsArrayLiteral node)
{
// same logic for most nodes
TypicalHandler(node);
}
private static bool OnlyHasConstantItems(JsArrayLiteral arrayLiteral)
{
var elementCount = arrayLiteral.Elements.Count;
for (var ndx = 0; ndx < elementCount; ++ndx)
{
// if any one element isn't a constant or isn't safe for combination, then bail with false
var constantWrapper = arrayLiteral.Elements[ndx] as JsConstantWrapper;
if (constantWrapper == null || !constantWrapper.IsOkayToCombine)
{
return false;
}
}
// if we get here, they were all constant
return true;
}
private static string ComputeJoin(JsArrayLiteral arrayLiteral, JsConstantWrapper separatorNode)
{
// if the separator node is null, then the separator is a single comma character.
// otherwise it's just the string value of the separator.
var separator = separatorNode == null ? "," : separatorNode.ToString();
var sb = new StringBuilder();
for (var ndx = 0; ndx < arrayLiteral.Elements.Count; ++ndx)
{
// add the separator between items (if we have one)
if (ndx > 0 && !string.IsNullOrEmpty(separator))
{
sb.Append(separator);
}
// the element is a constant wrapper (we wouldn't get this far if it wasn't),
// but we've overloaded the virtual ToString method on ConstantWrappers to convert the
// constant value to a string value.
sb.Append(arrayLiteral.Elements[ndx].ToString());
}
return sb.ToString();
}
public override void Visit(JsCallNode node)
{
if (node != null)
{
// see if this is a member (we'll need it for a couple checks)
JsMember member = node.Function as JsMember;
JsLookup lookup;
if (m_parser.Settings.StripDebugStatements
&& m_parser.Settings.IsModificationAllowed(JsTreeModifications.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 have "new root.func(...)", root.func is a debug namespace, and we
// are stripping debug namespaces. Replace the new-operator with an
// empty object literal and bail.
node.Parent.ReplaceChild(node, new JsObjectLiteral(node.Context, node.Parser));
return;
}
}
// 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 = node.Function as JsLookup;
if (lookup != null)
{
if (lookup.Name == "Object"
&& m_parser.Settings.IsModificationAllowed(JsTreeModifications.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
var objLiteral = new JsObjectLiteral(node.Context, m_parser);
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.
var objectLiteral = node.Arguments[0] as JsObjectLiteral;
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(JsTreeModifications.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.
JsConstantWrapper constWrapper = (node.Arguments != null && node.Arguments.Count == 1
? node.Arguments[0] as JsConstantWrapper
: 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
var arrayLiteral = new JsArrayLiteral(node.Context, m_parser)
{
Elements = 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]
var resourceList = m_parser.Settings.ResourceStrings;
if (node.InBrackets && resourceList.Count > 0)
{
// if we don't have a match visitor, create it now
if (m_matchVisitor == null)
{
m_matchVisitor = new JsMatchPropertiesVisitor();
}
// check each resource strings object to see if we have a match.
// Walk the list BACKWARDS so that later resource string definitions supercede previous ones.
for (var ndx = resourceList.Count - 1; ndx >= 0; --ndx)
{
var resourceStrings = resourceList[ndx];
// check to see if the resource strings name matches the function
if (resourceStrings != null && m_matchVisitor.Match(node.Function, resourceStrings.Name))
{
// 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
JsConstantWrapper argConstant = node.Arguments[0] as JsConstantWrapper;
if (argConstant != null)
{
string resourceName = argConstant.Value.ToString();
// get the localized string from the resources object
JsConstantWrapper resourceLiteral = new JsConstantWrapper(
resourceStrings[resourceName],
JsPrimitiveType.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(JsTreeModifications.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(JsTreeModifications.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)
JsMember replacementMember = new JsMember(node.Context, m_parser)
{
Root = node.Function,
Name = argText,
NameContext = 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[0] = new JsConstantWrapper(newName, JsPrimitiveType.String, node.Arguments[0].Context, m_parser);
}
}
else if (m_parser.Settings.IsModificationAllowed(JsTreeModifications.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
JsMember replacementMember = new JsMember(node.Context, m_parser)
{
Root = node.Function,
Name = argText,
NameContext = 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 JsMember;
lookup = node.Function as JsLookup;
var isEval = false;
if (lookup != null
&& string.CompareOrdinal(lookup.Name, "eval") == 0
&& lookup.VariableField.FieldType == JsFieldType.Predefined)
{
// 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.Root.IsWindowLookup)
{
// this is a call to window.eval()
isEval = true;
}
}
else
{
JsCallNode callNode = node.Function as JsCallNode;
if (callNode != null
&& callNode.InBrackets
&& callNode.Function.IsWindowLookup
&& callNode.Arguments.IsSingleConstantArgument("eval"))
{
// this is a call to window["eval"]
isEval = true;
}
}
if (isEval)
{
if (m_parser.Settings.EvalTreatment != JsEvalTreatment.Ignore)
{
// mark this scope as unknown so we don't crunch out locals
// we might reference in the eval at runtime
m_scopeStack.Peek().IsKnownAtCompileTime = false;
}
}
}
}