public ClassConstructor(Context context, FunctionDefinition creator, ClassDefinition classDefinition)
: base(context, creator)
{
this.classDefinition = classDefinition;
}
internal static CodeNode Parse(ParseInfo state, ref int index)
{
string code = state.Code;
int i = index;
if (!Parser.Validate(code, "class", ref i))
{
return(null);
}
while (Tools.IsWhiteSpace(code[i]))
{
i++;
}
string name = null;
Expression baseType = null;
if (!Parser.Validate(code, "extends ", i))
{
var n = i;
if (Parser.ValidateName(code, ref i, true))
{
name = code.Substring(n, i - n);
}
while (Tools.IsWhiteSpace(code[i]))
{
i++;
}
}
if (Parser.Validate(code, "extends ", ref i))
{
var n = i;
if (!Parser.ValidateName(code, ref i, true) && !Parser.Validate(code, "null", ref i))
{
ExceptionHelper.ThrowSyntaxError("Invalid base class name", state.Code, i);
}
var baseClassName = code.Substring(n, i - n);
if (baseClassName == "null")
{
baseType = new Constant(JSValue.@null);
}
else
{
baseType = new Variable(baseClassName, 1);
}
baseType.Position = n;
baseType.Length = i - n;
while (Tools.IsWhiteSpace(code[i]))
{
i++;
}
}
if (code[i] != '{')
{
ExceptionHelper.ThrowSyntaxError(Strings.UnexpectedToken, code, i);
}
FunctionDefinition ctor = null;
ClassDefinition result = null;
var oldStrict = state.strict;
state.strict = true;
var flds = new Dictionary <string, MemberDescriptor>();
var computedProperties = new List <MemberDescriptor>();
var oldCodeContext = state.CodeContext;
state.CodeContext |= CodeContext.InExpression;
try
{
while (code[i] != '}')
{
do
{
i++;
}while (Tools.IsWhiteSpace(code[i]) || code[i] == ';');
int s = i;
if (state.Code[i] == '}')
{
break;
}
bool @static = Parser.Validate(state.Code, "static", ref i);
if (@static)
{
Tools.SkipSpaces(state.Code, ref i);
s = i;
}
bool getOrSet = Parser.Validate(state.Code, "get", ref i) || Parser.Validate(state.Code, "set", ref i);
if (getOrSet)
{
Tools.SkipSpaces(state.Code, ref i);
}
var asterisk = state.Code[i] == '*';
if (asterisk)
{
do
{
i++;
}while (Tools.IsWhiteSpace(state.Code[i]));
}
if (Parser.Validate(state.Code, "[", ref i))
{
var propertyName = ExpressionTree.Parse(state, ref i, false, false, false, true, false);
while (Tools.IsWhiteSpace(state.Code[i]))
{
i++;
}
if (state.Code[i] != ']')
{
ExceptionHelper.ThrowSyntaxError("Expected ']'", state.Code, i);
}
do
{
i++;
}while (Tools.IsWhiteSpace(state.Code[i]));
CodeNode initializer;
if (state.Code[i] == '(')
{
initializer = FunctionDefinition.Parse(state, ref i, asterisk ? FunctionKind.AnonymousGenerator : FunctionKind.AnonymousFunction);
}
else
{
initializer = ExpressionTree.Parse(state, ref i);
}
switch (state.Code[s])
{
case 'g':
{
computedProperties.Add(new MemberDescriptor((Expression)propertyName, new PropertyPair((Expression)initializer, null), @static));
break;
}
case 's':
{
computedProperties.Add(new MemberDescriptor((Expression)propertyName, new PropertyPair(null, (Expression)initializer), @static));
break;
}
default:
{
computedProperties.Add(new MemberDescriptor((Expression)propertyName, (Expression)initializer, @static));
break;
}
}
}
else if (getOrSet)
{
i = s;
var mode = state.Code[i] == 's' ? FunctionKind.Setter : FunctionKind.Getter;
var propertyAccessor = FunctionDefinition.Parse(state, ref i, mode) as FunctionDefinition;
var accessorName = (@static ? "static " : "") + propertyAccessor._name;
if (!flds.ContainsKey(accessorName))
{
var propertyPair = new PropertyPair
(
mode == FunctionKind.Getter ? propertyAccessor : null,
mode == FunctionKind.Setter ? propertyAccessor : null
);
flds.Add(accessorName, new MemberDescriptor(new Constant(propertyAccessor._name), propertyPair, @static));
}
else
{
var vle = flds[accessorName].Value as PropertyPair;
if (vle == null)
{
ExceptionHelper.Throw((new SyntaxError("Try to define " + mode.ToString().ToLowerInvariant() + " for defined field at " + CodeCoordinates.FromTextPosition(state.Code, s, 0))));
}
do
{
if (mode == FunctionKind.Getter)
{
if (vle.Getter == null)
{
vle.Getter = propertyAccessor;
break;
}
}
else
{
if (vle.Setter == null)
{
vle.Setter = propertyAccessor;
break;
}
}
ExceptionHelper.ThrowSyntaxError("Try to redefine " + mode.ToString().ToLowerInvariant() + " of " + propertyAccessor.Name, state.Code, s);
}while (false);
}
}
else
{
i = s;
string fieldName = null;
if (state.Code[i] == '*')
{
do
{
i++;
}while (Tools.IsWhiteSpace(code[i]));
}
if (Parser.ValidateName(state.Code, ref i, false, true, state.strict))
{
fieldName = Tools.Unescape(state.Code.Substring(s, i - s), state.strict);
}
else if (Parser.ValidateValue(state.Code, ref i))
{
double d = 0.0;
int n = s;
if (Tools.ParseNumber(state.Code, ref n, out d))
{
fieldName = Tools.DoubleToString(d);
}
else if (state.Code[s] == '\'' || state.Code[s] == '"')
{
fieldName = Tools.Unescape(state.Code.Substring(s + 1, i - s - 2), state.strict);
}
}
if (fieldName == null)
{
ExceptionHelper.Throw((new SyntaxError("Invalid member name at " + CodeCoordinates.FromTextPosition(state.Code, s, i - s))));
}
if (fieldName == "constructor")
{
if (@static)
{
ExceptionHelper.ThrowSyntaxError(Strings.ConstructorCannotBeStatic, state.Code, s);
}
if (ctor != null)
{
ExceptionHelper.ThrowSyntaxError("Trying to redefinition constructor", state.Code, s);
}
state.CodeContext |= CodeContext.InClassConstructor;
}
else if (@static)
{
fieldName = "static " + fieldName;
state.CodeContext |= CodeContext.InStaticMember;
}
if (flds.ContainsKey(fieldName))
{
ExceptionHelper.Throw(new SyntaxError("Trying to redefinition member \"" + fieldName + "\" at " + CodeCoordinates.FromTextPosition(state.Code, s, i - s)));
}
state.CodeContext |= CodeContext.InClassDefinition;
state.CodeContext &= ~CodeContext.InGenerator;
i = s;
var method = FunctionDefinition.Parse(state, ref i, FunctionKind.Method) as FunctionDefinition;
if (method == null)
{
ExceptionHelper.ThrowSyntaxError("Unable to parse method", state.Code, i);
}
if (fieldName == "constructor")
{
ctor = method;
}
else
{
flds[fieldName] = new MemberDescriptor(new Constant(method._name), method, @static);
}
}
code = state.Code;
}
if (ctor == null)
{
string ctorCode;
int ctorIndex = 0;
if (baseType != null && !(baseType is Constant))
{
ctorCode = "constructor(...args) { super(...args); }";
}
else
{
ctorCode = "constructor(...args) { }";
}
ctor = (FunctionDefinition)FunctionDefinition.Parse(
new ParseInfo(ctorCode, ctorCode, null)
{
strict = true,
CodeContext = CodeContext.InClassConstructor | CodeContext.InClassDefinition
},
ref ctorIndex,
FunctionKind.Method);
}
result = new ClassDefinition(name, baseType, new List <MemberDescriptor>(flds.Values).ToArray(), ctor as FunctionDefinition, computedProperties.ToArray());
if ((oldCodeContext & CodeContext.InExpression) == 0)
{
if (string.IsNullOrEmpty(name))
{
ExceptionHelper.ThrowSyntaxError("Class must have name", state.Code, index);
}
if (state.strict && state.functionScopeLevel != state.lexicalScopeLevel)
{
ExceptionHelper.ThrowSyntaxError("In strict mode code, class can only be declared at top level or immediately within other function.", state.Code, index);
}
state.Variables.Add(result.reference._descriptor);
}
}
finally
{
state.CodeContext = oldCodeContext;
state.strict = oldStrict;
}
index = i + 1;
return(result);
}
