private static void GenerateLateBoundExpression(ScriptGenerator generator, MemberSymbol symbol, LateBoundExpression expression)
{
ScriptTextWriter writer = generator.Writer;
string name = null;
LiteralExpression literalNameExpression = expression.NameExpression as LiteralExpression;
if (literalNameExpression != null) {
Debug.Assert(literalNameExpression.Value is string);
name = (string)literalNameExpression.Value;
Debug.Assert(String.IsNullOrEmpty(name) == false);
}
if (expression.Operation == LateBoundOperation.DeleteField) {
writer.Write("delete ");
}
if (expression.Operation == LateBoundOperation.GetScriptType) {
writer.Write("typeof(");
}
else if ((expression.Operation == LateBoundOperation.HasMethod) ||
(expression.Operation == LateBoundOperation.HasProperty)) {
writer.Write("(typeof(");
}
else if (expression.Operation == LateBoundOperation.HasField) {
writer.Write("(");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write(" in ");
}
if (expression.ObjectReference != null) {
GenerateExpression(generator, symbol, expression.ObjectReference);
}
switch (expression.Operation) {
case LateBoundOperation.InvokeMethod:
if (Utility.IsValidIdentifier(name)) {
if (expression.ObjectReference != null) {
writer.Write(".");
}
writer.Write(name);
}
else {
writer.Write("[");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write("(");
if (expression.Parameters.Count != 0) {
GenerateExpressionList(generator, symbol, expression.Parameters);
}
writer.Write(")");
break;
case LateBoundOperation.GetField:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".");
writer.Write(name);
}
else {
writer.Write("[");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
break;
case LateBoundOperation.SetField:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".");
writer.Write(name);
}
else {
writer.Write("[");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.WriteTrimmed(" = ");
GenerateExpressionList(generator, symbol, expression.Parameters);
break;
case LateBoundOperation.DeleteField:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".");
writer.Write(name);
}
else {
writer.Write("[");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
break;
case LateBoundOperation.GetProperty:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".get_");
writer.Write(name);
}
else {
writer.Write("['get_'");
writer.WriteTrimmed(" + ");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write("()");
break;
case LateBoundOperation.SetProperty:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".set_");
writer.Write(name);
}
else {
writer.Write("['set_'");
writer.WriteTrimmed(" + ");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write("(");
GenerateExpressionList(generator, symbol, expression.Parameters);
writer.Write(")");
break;
case LateBoundOperation.AddHandler:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".add_");
writer.Write(name);
}
else {
writer.Write("['add_'");
writer.WriteTrimmed(" + ");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write("(");
GenerateExpressionList(generator, symbol, expression.Parameters);
writer.Write(")");
break;
case LateBoundOperation.RemoveHandler:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".remove_");
writer.Write(name);
}
else {
writer.Write("['remove_'");
writer.WriteTrimmed(" + ");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write("(");
GenerateExpressionList(generator, symbol, expression.Parameters);
writer.Write(")");
break;
case LateBoundOperation.GetScriptType:
writer.Write(")");
break;
case LateBoundOperation.HasField:
writer.Write(")");
break;
case LateBoundOperation.HasMethod:
if (Utility.IsValidIdentifier(name)) {
if (expression.ObjectReference != null) {
writer.Write(".");
}
writer.Write(name);
}
else {
writer.Write("[");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write(")");
writer.WriteTrimmed(" === ");
writer.Write("'function'");
writer.Write(")");
break;
case LateBoundOperation.HasProperty:
if (Utility.IsValidIdentifier(name)) {
writer.Write(".get_");
writer.Write(name);
}
else {
writer.Write("['get_'");
writer.WriteTrimmed(" + ");
GenerateExpression(generator, symbol, expression.NameExpression);
writer.Write("]");
}
writer.Write(")");
writer.WriteTrimmed(" === ");
writer.Write("'function'");
writer.Write(")");
break;
}
}
private Expression ProcessOpenParenExpressionNode(BinaryExpressionNode node) {
bool isDelegateInvoke = false;
Expression leftExpression = BuildExpression(node.LeftChild);
if (leftExpression is LocalExpression) {
Debug.Assert(leftExpression.EvaluatedType.Type == SymbolType.Delegate);
// Handle the implicit delegate invoke scenario by turning the expression
// into an explicit call into the delegate's Invoke method
MemberSymbol invokeMethodSymbol = leftExpression.EvaluatedType.GetMember("Invoke");
Debug.Assert(invokeMethodSymbol != null);
leftExpression = new MemberExpression(leftExpression, invokeMethodSymbol);
isDelegateInvoke = true;
}
if (leftExpression.Type != ExpressionType.Member) {
// A method call was evaluated into a non-member expression as part of building
// the left node. For example, Nullable<T>.GetValueOrDefault() becomes a logical or expression.
return leftExpression;
}
MemberExpression memberExpression = (MemberExpression)leftExpression;
ExpressionListNode argNodes = null;
List<Expression> args = null;
if (node.RightChild != null) {
Debug.Assert(node.RightChild is ExpressionListNode);
argNodes = (ExpressionListNode)node.RightChild;
args = BuildExpressionList(argNodes);
}
MethodExpression methodExpression = null;
if (memberExpression.Member.Type != SymbolType.Method) {
// A non-method member is being used in a method call; the member must be
// a delegate...
Debug.Assert(memberExpression.EvaluatedType.Type == SymbolType.Delegate);
Expression instanceExpression = TransformMemberExpression(memberExpression);
MethodSymbol invokeMethod =
(MethodSymbol)memberExpression.EvaluatedType.GetMember("Invoke");
Debug.Assert(invokeMethod != null);
methodExpression = new MethodExpression(instanceExpression, invokeMethod);
isDelegateInvoke = true;
}
else {
// The member being accessed is a method...
// REVIEW: Uggh... this has become too complex over time with all the transformations
// added over time. Refactoring needed...
MethodSymbol method = (MethodSymbol)memberExpression.Member;
TypeSymbol objectType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Object);
TypeSymbol typeType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Type);
TypeSymbol dictionaryType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Dictionary);
TypeSymbol genericDictionaryType = _symbolSet.ResolveIntrinsicType(IntrinsicType.GenericDictionary);
TypeSymbol numberType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Number);
TypeSymbol stringType = _symbolSet.ResolveIntrinsicType(IntrinsicType.String);
TypeSymbol scriptType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Script);
TypeSymbol argsType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Arguments);
if ((method.Parent == objectType) &&
method.Name.Equals("GetType", StringComparison.Ordinal)) {
// Since we can't extend object's prototype, we need to transform the
// natural c# syntax into a static method.
// Object.GetType instance method becomes Type.GetInstanceType static method
TypeSymbol typeSymbol = typeType;
method = (MethodSymbol)typeSymbol.GetMember("GetInstanceType");
Debug.Assert(method != null);
methodExpression = new MethodExpression(new TypeExpression(typeSymbol, SymbolFilter.Public | SymbolFilter.StaticMembers),
method);
methodExpression.AddParameterValue(memberExpression.ObjectReference);
return methodExpression;
}
else if ((method.Parent == objectType) &&
(method.Name.Equals("ToString", StringComparison.Ordinal) ||
method.Name.Equals("ToLocaleString", StringComparison.Ordinal)) &&
(memberExpression.ObjectReference.EvaluatedType == stringType)) {
// No-op ToString calls on strings (this happens when performing a ToString
// on a named enum value.
return memberExpression.ObjectReference;
}
else if ((method.Parent == objectType) &&
(method.Name.Equals("ToString", StringComparison.Ordinal) ||
method.Name.Equals("ToLocaleString", StringComparison.Ordinal)) &&
(memberExpression.ObjectReference.EvaluatedType is EnumerationSymbol)) {
EnumerationSymbol enumSymbol = (EnumerationSymbol)memberExpression.ObjectReference.EvaluatedType;
if (enumSymbol.UseNamedValues) {
// If the enum value is a named enum, then it is already a string.
return memberExpression.ObjectReference;
}
return new MethodExpression(memberExpression.ObjectReference, method);
}
else if (((method.Parent == dictionaryType) || (method.Parent == genericDictionaryType)) &&
method.Name.Equals("ContainsKey", StringComparison.Ordinal)) {
// Switch the instance ContainsKey method on Dictionary to
// calls to the static KeyExists method.
Debug.Assert(args.Count == 1);
MethodSymbol keyExistsMethod = (MethodSymbol)dictionaryType.GetMember("KeyExists");
Debug.Assert(keyExistsMethod != null);
methodExpression = new MethodExpression(new TypeExpression(dictionaryType, SymbolFilter.Public | SymbolFilter.StaticMembers),
keyExistsMethod);
methodExpression.AddParameterValue(memberExpression.ObjectReference);
methodExpression.AddParameterValue(args[0]);
return methodExpression;
}
else if (((method.Parent == dictionaryType) || (method.Parent == genericDictionaryType)) &&
method.Name.Equals("Remove", StringComparison.Ordinal)) {
// Switch the instance Remove method on Dictionary to
// calls to the static DeleteKey method.
Debug.Assert(args.Count == 1);
return new LateBoundExpression(memberExpression.ObjectReference,
args[0], LateBoundOperation.DeleteField,
objectType);
}
else if (((method.Parent == dictionaryType) || (method.Parent == genericDictionaryType)) &&
method.Name.Equals("Clear")) {
// Switch the instance Clear method on Dictionary to
// calls to the static ClearKeys method.
MethodSymbol clearKeysMethod = (MethodSymbol)dictionaryType.GetMember("ClearKeys");
Debug.Assert(clearKeysMethod != null);
methodExpression = new MethodExpression(new TypeExpression(dictionaryType, SymbolFilter.Public | SymbolFilter.StaticMembers),
clearKeysMethod);
methodExpression.AddParameterValue(memberExpression.ObjectReference);
return methodExpression;
}
else if (((method.Parent == dictionaryType) || (((TypeSymbol)method.Parent).GenericType == genericDictionaryType)) &&
((method.Visibility & MemberVisibility.Static) != 0) &&
method.Name.Equals("GetDictionary", StringComparison.Ordinal)) {
// Dictionary.GetDictionary is a no-op method; we're just interested
// in the object being passed in.
// However we'll re-evaluate the argument to be of dictionary type
// so that subsequent use of this expression sees it as a dictionary.
Debug.Assert(args.Count == 1);
args[0].Reevaluate((TypeSymbol)method.Parent);
return args[0];
}
else if ((method.Parent == stringType) &&
(method.Name.Equals("Escape", StringComparison.Ordinal) ||
method.Name.Equals("Unescape", StringComparison.Ordinal) ||
method.Name.Equals("EncodeUri", StringComparison.Ordinal) ||
method.Name.Equals("DecodeUri", StringComparison.Ordinal) ||
method.Name.Equals("EncodeUriComponent", StringComparison.Ordinal) ||
method.Name.Equals("DecodeUriComponent", StringComparison.Ordinal))) {
// String.<Method> becomes Script.<Method>, as its a global method in script
MethodSymbol scriptMethod = (MethodSymbol)scriptType.GetMember(method.Name);
methodExpression = new MethodExpression(new TypeExpression(scriptType, SymbolFilter.Public | SymbolFilter.StaticMembers),
scriptMethod);
methodExpression.AddParameterValue(memberExpression.ObjectReference);
return methodExpression;
}
else if ((method.Parent == scriptType) &&
method.Name.Equals("Literal", StringComparison.Ordinal)) {
// Convert a call to Script.Literal into a literal expression
Debug.Assert(args.Count >= 1);
string script = null;
if (args[0].Type == ExpressionType.Field) {
Debug.Assert(args[0].EvaluatedType == stringType);
FieldSymbol field = ((FieldExpression)args[0]).Field;
if (field.IsConstant) {
Debug.Assert(field.Value is string);
script = (string)field.Value;
}
}
else if (args[0].Type == ExpressionType.Literal) {
Debug.Assert(((LiteralExpression)args[0]).Value is string);
script = (string)((LiteralExpression)args[0]).Value;
}
if (script == null) {
// TODO: When we start raising errors at the expression level instead of the statement
// level, we should return an ErrorExpression instead of a dummy expression.
Token argToken = argNodes.Expressions[0].Token;
_errorHandler.ReportError("The argument to Script.Literal must be a constant string.",
argToken.Location);
return new InlineScriptExpression("", objectType);
}
InlineScriptExpression scriptExpression = new InlineScriptExpression(script, objectType);
for (int i = 1; i < args.Count; i++) {
scriptExpression.AddParameterValue(args[i]);
}
return scriptExpression;
}
else if ((method.Parent == scriptType) &&
method.Name.Equals("Boolean", StringComparison.Ordinal)) {
Debug.Assert(args.Count == 1);
return new UnaryExpression(Operator.LogicalNot, new UnaryExpression(Operator.LogicalNot, args[0]));
}
else if ((method.Parent == scriptType) &&
method.Name.Equals("Value", StringComparison.Ordinal)) {
Debug.Assert(args.Count >= 2);
Expression expr = args[0];
for (int i = 1; i < args.Count; i++) {
expr = new BinaryExpression(Operator.LogicalOr, expr, args[i]);
}
expr.Reevaluate(args[0].EvaluatedType);
expr.AddParenthesisHint();
return expr;
}
else if (method.Parent == argsType) {
if (method.Name.Equals("GetArgument", StringComparison.Ordinal)) {
// Switch Arguments.GetArgument into Arguments[]
Debug.Assert(args.Count == 1);
IndexerExpression indexExpression =
new IndexerExpression(new LiteralExpression(typeType, method.Parent),
((ClassSymbol)method.Parent).GetIndexer());
indexExpression.AddIndexParameterValue(args[0]);
return indexExpression;
}
else if (method.Name.Equals("ToArray", StringComparison.Ordinal)) {
// Switch Arguments.ToArray into Array.ToArray(arguments)
TypeSymbol arrayType = _symbolSet.ResolveIntrinsicType(IntrinsicType.Array);
MethodSymbol toArrayMethod = (MethodSymbol)arrayType.GetMember("ToArray");
InlineScriptExpression argsExpression =
new InlineScriptExpression("arguments", objectType, /* parenthesize */ false);
MethodExpression toArrayExpression =
new MethodExpression(new TypeExpression(arrayType, SymbolFilter.Public | SymbolFilter.StaticMembers),
toArrayMethod);
toArrayExpression.AddParameterValue(argsExpression);
return toArrayExpression;
}
}
else {
bool lateBound = false;
if (method.Parent == scriptType) {
LateBoundOperation lateBoundOperation = LateBoundOperation.InvokeMethod;
if (method.Name.Equals("InvokeMethod", StringComparison.Ordinal)) {
lateBound = true;
}
else if (method.Name.Equals("DeleteField", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.DeleteField;
}
else if (method.Name.Equals("GetField", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.GetField;
}
else if (method.Name.Equals("SetField", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.SetField;
}
else if (method.Name.Equals("GetScriptType", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.GetScriptType;
}
else if (method.Name.Equals("HasField", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.HasField;
}
else if (method.Name.Equals("HasMethod", StringComparison.Ordinal)) {
lateBound = true;
lateBoundOperation = LateBoundOperation.HasMethod;
}
else if (method.Name.Equals("CreateInstance", StringComparison.Ordinal)) {
Debug.Assert(args.Count >= 1);
if ((args[0].Type == ExpressionType.MethodInvoke) ||
(args[0].Type == ExpressionType.PropertyGet)) {
// When using the result of a method call/property access directly
// with Type.CreateInstance, the following script would be generated:
//
// new method()()
// which is invalid. Instead we need to generate the following:
// var type = method();
// new type()
_errorHandler.ReportError("You must store the type returned from a method or property into a local variable to use with Type.CreateInstance.",
node.Token.Location);
}
NewExpression newExpression = new NewExpression(args[0], objectType);
if (args.Count > 1) {
bool first = true;
foreach (Expression paramExpr in args) {
if (first) {
first = false;
continue;
}
newExpression.AddParameterValue(paramExpr);
}
}
return newExpression;
}
if (lateBound) {
// Switch explicit late-bound calls into implicit late-bound expressions
// in script
Debug.Assert((args != null) &&
(((lateBoundOperation == LateBoundOperation.GetScriptType) && (args.Count == 1)) ||
(args.Count >= 2)));
LateBoundExpression lateBoundExpression = null;
Expression instanceExpression = null;
Expression nameExpression = null;
foreach (Expression paramExpr in args) {
if (instanceExpression == null) {
instanceExpression = paramExpr;
if (lateBoundOperation == LateBoundOperation.GetScriptType) {
// GetScriptType only takes an instance
return new LateBoundExpression(instanceExpression, null,
lateBoundOperation, objectType);
}
continue;
}
if (nameExpression == null) {
nameExpression = paramExpr;
Expression objectExpression = instanceExpression;
if (lateBoundOperation == LateBoundOperation.InvokeMethod) {
if ((instanceExpression.Type == ExpressionType.Literal) &&
(((LiteralExpression)instanceExpression).Value == null)) {
objectExpression = null;
LiteralExpression literalExpression = nameExpression as LiteralExpression;
if (literalExpression == null) {
_errorHandler.ReportError("The name of a global method must be a constant string known at compile time.",
argNodes.Expressions[0].Token.Location);
}
else if (!Utility.IsValidIdentifier((string)literalExpression.Value)) {
_errorHandler.ReportError("The name of a global method must be a valid identifer.",
argNodes.Expressions[0].Token.Location);
}
}
}
lateBoundExpression = new LateBoundExpression(objectExpression, nameExpression,
lateBoundOperation, objectType);
continue;
}
lateBoundExpression.AddParameterValue(paramExpr);
}
Debug.Assert(lateBoundExpression != null);
return lateBoundExpression;
}
}
if (!method.MatchesConditions(_options.Defines)) {
return null;
}
methodExpression = new MethodExpression(memberExpression.ObjectReference,
method);
}
}
if (args != null) {
foreach (Expression paramExpr in args) {
methodExpression.AddParameterValue(paramExpr);
}
}
if (isDelegateInvoke) {
return new DelegateInvokeExpression(methodExpression);
}
return methodExpression;
}