/*
GRAMMAR OF A CONSTANT DECLARATION
constant-declaration → attributes opt declaration-specifiers opt let pattern-initializer-list
pattern-initializer-list → pattern-initializer | pattern-initializer,pattern-initializer-list
pattern-initializer → pattern initializer opt
initializer → =expression
*/
DeclarationPtr Parser::parseLet(const std::vector<AttributePtr>& attrs, int specifiers)
{
Token token;
Flags flag(this, UNDER_LET);
expect(Keyword::Let, token);
ValueBindingsPtr ret = nodeFactory->createValueBindings(token.state);
ret->setReadOnly(true);
ret->setAttributes(attrs);
ret->setSpecifiers(specifiers);
do
{
PatternPtr pattern = parsePattern();
ExpressionPtr initializer = NULL;
if(match(L"="))
{
initializer = parseExpression();
}
ValueBindingPtr constant = nodeFactory->createValueBinding(*pattern->getSourceInfo());
constant->setAttributes(attrs);
constant->setSpecifiers(specifiers);
constant->setName(pattern);
TypedPatternPtr typedPattern = std::dynamic_pointer_cast<TypedPattern>(pattern);
if(typedPattern)
{
//promote typed pattern
constant->setDeclaredType(typedPattern->getDeclaredType());
constant->setName(typedPattern->getPattern());
}
constant->setInitializer(initializer);
ret->add(constant);
}while(match(L","));
return ret;
}
/*
GRAMMAR OF A VARIABLE DECLARATION
variable-declaration → variable-declaration-head pattern-initializer-list
variable-declaration → variable-declaration-head variable-name type-annotation code-block
variable-declaration → variable-declaration-head variable-name type-annotation getter-setter-block
variable-declaration → variable-declaration-head variable-name type-annotation getter-setter-keyword-block
variable-declaration → variable-declaration-head variable-name type-annotation initializer opt willSet-didSet-block
variable-declaration-head → attributes opt declaration-specifiers opt var
variable-name → identifier
*/
DeclarationPtr Parser::parseVar(const std::vector<AttributePtr>& attrs, int specifiers)
{
Token token;
expect(Keyword::Var, token);
Flags flags(this, UNDER_VAR);
//try read it as pattern-initializer-list
ValueBindingsPtr ret = nodeFactory->createValueBindings(token.state);
ret->setReadOnly(false);
ret->setAttributes(attrs);
ret->setSpecifiers(specifiers);
ValueBindingPtr var = parseVariableDeclaration();
var->setSpecifiers(specifiers);
ret->add(var);
if(predicate(L","))
{
while(match(L","))
{
var = parseVariableDeclaration();
var->setSpecifiers(specifiers);
ret->add(var);
}
return ret;
}
if(!match(L"{"))
return ret;
peek(token);
IdentifierPtr name = std::dynamic_pointer_cast<Identifier>(var->getName());
tassert(token, name != nullptr, Errors::E_GETTER_SETTER_CAN_ONLY_BE_DEFINED_FOR_A_SINGLE_VARIABLE, L"");
ComputedPropertyPtr prop = nodeFactory->createComputedProperty(*var->getSourceInfo());
prop->setAttributes(attrs);
prop->setSpecifiers(specifiers);
prop->setTypeAttributes(var->getTypeAttributes());
prop->setName(name->getIdentifier());
prop->setDeclaredType(var->getDeclaredType());
prop->setInitializer(var->getInitializer());
var = nullptr;
ret = nullptr;
if(token.type != TokenType::CloseBrace)
{
Flags flags(this, SUPPRESS_TRAILING_CLOSURE);
switch(token.getKeyword())
{
case Keyword::Get:
case Keyword::Set:
if(this->flags & UNDER_PROTOCOL)
{
// variable-declaration → variable-declaration-head variable-name type-annotation getter-setter-keyword-block
//no code block for getter/setter for protocol
std::pair<CodeBlockPtr, CodeBlockPtr> r = parseGetterSetterKeywordBlock();
prop->setGetter(r.first);
prop->setSetter(r.second);
}
else
{
// variable-declaration → variable-declaration-head variable-name type-annotation getter-setter-block
std::pair<CodeBlockPtr, std::pair<std::wstring, CodeBlockPtr> > r = parseGetterSetterBlock();
prop->setGetter(r.first);
prop->setSetterName(r.second.first);
prop->setSetter(r.second.second);
}
break;
case Keyword::WillSet:
case Keyword::DidSet:
// variable-declaration → variable-declaration-head variable-name type-annotation initializer opt willSet-didSet-block
parseWillSetDidSetBlock(prop);
break;
default:
// variable-declaration → variable-declaration-head variable-name type-annotation code-block
CodeBlockPtr getter = nodeFactory->createCodeBlock(token.state);
prop->setGetter(getter);
do
{
StatementPtr st = parseStatement();
getter->addStatement(st);
}while(!predicate(L"}"));
break;
}
}
expect(L"}");
return prop;
}