/// <summary>
/// Parses an anonymous object.
/// </summary>
internal static SProtoObject Parse(ScriptProcessor processor, string source)
{
Prototype prototype = new Prototype(LITERAL_OBJECT);
source = source.Trim();
// Format: { member1 : content1, member2 : content2 }
// Remove "{" and "}":
source = source.Remove(source.Length - 1, 1).Remove(0, 1).Trim();
if (source.Length == 0)
return prototype.CreateInstance(processor, null, false);
int index = 0;
string identifier = "";
string content = "";
SObject contentObj = null;
while (index < source.Length)
{
int nextSeperatorIndex = source.IndexOf(",", index);
if (nextSeperatorIndex == -1)
{
nextSeperatorIndex = source.Length - 1;
}
else
{
//Let's find the correct ",":
nextSeperatorIndex = index;
int depth = 0;
StringEscapeHelper escaper = new LeftToRightStringEscapeHelper(source, nextSeperatorIndex, true);
bool foundSeperator = false;
while (!foundSeperator && nextSeperatorIndex < source.Length)
{
char t = source[nextSeperatorIndex];
escaper.CheckStartAt(nextSeperatorIndex);
if (!escaper.IsString)
{
if (t == '{' || t == '[' || t == '(')
{
depth++;
}
else if (t == '}' || t == ']' || t == ')')
{
depth--;
}
else if (t == ',' && depth == 0)
{
foundSeperator = true;
nextSeperatorIndex--; // it adds one to the index at the end of the while loop, but we need the index where we stopped searching, so we subtract 1 here to accommodate for that.
}
}
nextSeperatorIndex++;
}
}
string member = source.Substring(index, nextSeperatorIndex - index);
if (member.Contains(":"))
{
identifier = member.Remove(member.IndexOf(":")).Trim();
content = member.Remove(0, member.IndexOf(":") + 1);
contentObj = processor.ExecuteStatement(new ScriptStatement(content));
}
else
{
identifier = member.Trim();
contentObj = processor.Undefined;
}
if (!ScriptProcessor.IsValidIdentifier(identifier))
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_MISSING_VAR_NAME);
prototype.AddMember(processor, new PrototypeMember(identifier, contentObj));
index = nextSeperatorIndex + 1;
}
return prototype.CreateInstance(processor, null, false);
}
internal new static SObject Parse(ScriptProcessor processor, string code)
{
code = code.Trim();
if (Regex.IsMatch(code, REGEX_CLASS_SIGNATURE))
{
List<string> signature = code.Remove(code.IndexOf("{")).Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToList();
string extends = "";
string identifier = "";
bool isAbstract = false;
// Read extends:
if (signature.Contains(CLASS_SIGNATURE_EXTENDS))
{
int extendsIndex = signature.IndexOf(CLASS_SIGNATURE_EXTENDS);
if (extendsIndex + 1 == signature.Count) // when extends is the last element in the signature, throw error:
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_CLASS_EXTENDS_MISSING);
extends = signature[extendsIndex + 1]; // The extended class name is after the "extends" keyword.
signature.RemoveAt(extendsIndex); // Remove at the extends index twice, to remove the "extends" keyword and the identifier of the extended class.
signature.RemoveAt(extendsIndex);
}
// Read abstract:
if (signature.Contains(CLASS_SIGNATURE_ABSTRACT))
{
isAbstract = true;
signature.Remove(CLASS_SIGNATURE_ABSTRACT);
}
if (signature.Count != 2) // The signature must only have "class" and the identifier left.
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_INVALID_CLASS_SIGNATURE);
// Read class name:
identifier = signature[1];
if (!ScriptProcessor.IsValidIdentifier(identifier))
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_CLASS_IDENTIFIER_MISSING);
// Create instance:
Prototype prototype = new Prototype(identifier)
{
IsAbstract = isAbstract
};
// Handle extends:
if (extends.Length > 0)
{
if (isAbstract)
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_TYPE_ABSTRACT_NO_EXTENDS);
Prototype extendedPrototype = processor.Context.GetPrototype(extends);
if (extendedPrototype == null)
processor.ErrorHandler.ThrowError(ErrorType.ReferenceError, ErrorHandler.MESSAGE_REFERENCE_NO_PROTOTYPE, new object[] { extends });
prototype.Extends = extendedPrototype;
}
else
{
// Set default prototype:
prototype.Extends = processor.Context.GetPrototype("Object");
}
string body = code.Remove(0, code.IndexOf("{") + 1);
body = body.Remove(body.Length - 1, 1).Trim();
string additionalCtorCode = "";
string staticCtorCode = "";
ScriptStatement[] statements = StatementProcessor.GetStatements(processor, body);
foreach (ScriptStatement statement in statements)
{
if (statement.StatementType == StatementType.Var)
{
var parsed = ParseVarStatement(processor, statement);
if (parsed.Item1.Identifier == CLASS_METHOD_CTOR)
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_MISSING_VAR_NAME);
prototype.AddMember(processor, parsed.Item1);
if (parsed.Item2.Length > 0)
{
if (parsed.Item1.IsStatic)
{
staticCtorCode += string.Format(FORMAT_VAR_ASSIGNMENT, parsed.Item1.Identifier, parsed.Item2);
}
else
{
additionalCtorCode += string.Format(FORMAT_VAR_ASSIGNMENT, parsed.Item1.Identifier, parsed.Item2);
}
}
}
else if (statement.StatementType == StatementType.Function)
{
PrototypeMember parsed = ParseFunctionStatement(processor, statement);
if (parsed.Identifier == CLASS_METHOD_CTOR)
{
if (prototype.Constructor != null)
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_CLASS_DUPLICATE_DEFINITION, new object[] { parsed.Identifier, identifier });
prototype.Constructor = parsed;
}
else
{
prototype.AddMember(processor, parsed);
}
}
else
{
processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_CLASS_INVALID_STATEMENT);
}
}
// Add additional constructor code & static constructor code to prototype:
if (staticCtorCode.Length > 0)
{
prototype._staticConstructor = new SFunction(staticCtorCode, new string[] { });
prototype._staticConstructorProcessor = processor;
}
if (additionalCtorCode.Length > 0)
{
if (prototype.Constructor == null)
{
// Create new ctor if no one has been defined:
prototype.Constructor = new PrototypeMember(CLASS_METHOD_CTOR, new SFunction("", new string[] { }), false, true, false, false);
}
prototype.Constructor.ToFunction().Body = additionalCtorCode + prototype.Constructor.ToFunction().Body;
}
return prototype;
}
else
{
return processor.ErrorHandler.ThrowError(ErrorType.SyntaxError, ErrorHandler.MESSAGE_SYNTAX_INVALID_CLASS_SIGNATURE);
}
}
/// <summary>
/// Creates an instance of the given prototype.
/// </summary>
internal SObject CreateInstance(Prototype prototype, SObject[] parameters)
{
if (!prototype.IsAbstract)
return prototype.CreateInstance(_processor, parameters, true);
else
return _processor.ErrorHandler.ThrowError(ErrorType.TypeError, ErrorHandler.MESSAGE_TYPE_ABSTRACT_NO_INSTANCE);
}
/// <summary>
/// Creates an instance derived from this prototype.
/// </summary>
internal SProtoObject CreateInstance(ScriptProcessor processor, SObject[] parameters, bool executeCtor)
{
SProtoObject obj = CreateBaseObject();
obj.AddMember(MEMBER_NAME_PROTOTYPE, this);
if (typeof(ObjectPrototype) != GetType())
{
// If no extends class is explicitly specified, "Object" is assumed.
if (Extends == null)
Extends = processor.Context.GetPrototype("Object");
var superInstance = Extends.CreateInstance(processor, null, false);
obj.AddMember(MEMBER_NAME_SUPER, superInstance);
}
foreach (PrototypeMember member in GetInstanceMembers())
{
obj.AddMember(member.Identifier, member.Data);
}
var indexerGetFunction = GetIndexerGetFunction();
if (indexerGetFunction != null)
obj.IndexerGetFunction = indexerGetFunction.ToFunction();
var indexerSetFunction = GetIndexerSetFunction();
if (indexerSetFunction != null)
obj.IndexerSetFunction = indexerSetFunction.ToFunction();
if (executeCtor && Constructor != null)
{
Constructor.ToFunction().Call(processor, obj, obj, parameters);
}
// Lock all readonly members after the constructor call, so they can be set in the constructor:
foreach (PrototypeMember member in GetReadOnlyInstanceMembers())
obj.Members[member.Identifier].IsReadOnly = true;
return obj;
}
