Expression* LocalParselet::parse(Parser* parser, Token token)
{
UniquePtr<std::vector<Token>*> names = new std::vector<Token>;
do
{
Token name = parser->Consume(TokenType::Name);
names->push_back(name);
}
while (parser->MatchAndConsume(TokenType::Comma));
parser->Consume(TokenType::Assign);//its possible this wont be here and it may just be a mentioning, but no assignment
//handle multiple comma expressions
UniquePtr<std::vector<Expression*>*> rights = new std::vector<Expression*>;
do
{
Expression* right = parser->parseExpression(Precedence::ASSIGNMENT-1/*assignment prcedence -1 */);
rights->push_back(right);
}
while (parser->MatchAndConsume(TokenType::Comma));
parser->Consume(TokenType::Semicolon);
return new LocalExpression(names.Release(), rights.Release());
}
Expression* ForParselet::parse(Parser* parser, Token token)
{
parser->Consume(TokenType::LeftParen);
if (parser->LookAhead().type == TokenType::Local)
{
if (parser->LookAhead(1).type == TokenType::Name)
{
Token n = parser->LookAhead(2);
if (n.type == TokenType::Name && n.text == "in")
{
//ok its a foreach loop
parser->Consume();
auto name = parser->Consume();
parser->Consume();
UniquePtr<Expression*> container = parser->parseExpression();
parser->Consume(TokenType::RightParen);
auto block = new ScopeExpression(parser->parseBlock());
return new ForEachExpression(name, container.Release(), block);
}
}
}
UniquePtr<Expression*> initial = parser->ParseStatement(true);
UniquePtr<Expression*> condition = parser->ParseStatement(true);
UniquePtr<Expression*> increment = parser->parseExpression();
parser->Consume(TokenType::RightParen);
auto block = new ScopeExpression(parser->parseBlock());
return new ForExpression(token, initial.Release(), condition.Release(), increment.Release(), block);
}
Expression* IndexParselet::parse(Parser* parser, Expression* left, Token token)
{
UniquePtr<Expression*> index = parser->parseExpression();
parser->Consume(TokenType::RightBracket);
return new IndexExpression(left, index.Release(), token);
}
Expression* WhileParselet::parse(Parser* parser, Token token)
{
parser->Consume(TokenType::LeftParen);
UniquePtr<Expression*> condition = parser->parseExpression();
parser->Consume(TokenType::RightParen);
auto block = new ScopeExpression(parser->parseBlock());
return new WhileExpression(token, condition.Release(), block);
}
Expression* IfParselet::parse(Parser* parser, Token token)
{
std::vector<Branch*> branches;
//take parens
parser->Consume(TokenType::LeftParen);
UniquePtr<Expression*> ifcondition = parser->parseExpression();
parser->Consume(TokenType::RightParen);
BlockExpression* ifblock = parser->parseBlock(true);
branches.push_back(new Branch(ifblock, ifcondition.Release()));
Branch* Else = 0;
while(true)
{
//look for elses
if (parser->MatchAndConsume(TokenType::ElseIf))
{
//keep going
parser->Consume(TokenType::LeftParen);
UniquePtr<Expression*> condition = parser->parseExpression();
parser->Consume(TokenType::RightParen);
BlockExpression* block = parser->parseBlock(true);
branches.push_back(new Branch(block, condition.Release()));
}
else if (parser->MatchAndConsume(TokenType::Else))
{
//its an else
BlockExpression* block = parser->parseBlock(true);
Else = new Branch(block, 0);
break;
}
else
break;//nothing else
}
return new IfExpression(token, std::move(branches), Else);
}
Expression* SwapParselet::parse(Parser* parser, Expression* left, Token token)
{
if (dynamic_cast<IStorableExpression*>(left) == 0)
throw CompilerException(parser->filename, token.line, "SwapParselet: Left hand side must be a storable location!");
UniquePtr<Expression*> right = parser->parseExpression(Precedence::ASSIGNMENT-1/*assignment prcedence -1 */);
if (dynamic_cast<IStorableExpression*>((Expression*)right) == 0)
throw CompilerException(parser->filename, token.line, "SwapParselet: Right hand side must be a storable location!");
return new SwapExpression(left, right.Release());
}
Expression* NameParselet::parse(Parser* parser, Token token)
{
if (parser->MatchAndConsume(TokenType::LeftBracket))
{
//array index
UniquePtr<Expression*> index = parser->parseExpression();
parser->Consume(TokenType::RightBracket);
return new IndexExpression(new NameExpression(token.text), index.Release(), token);
}
else
return new NameExpression(token.text);
}
Expression* CallParselet::parse(Parser* parser, Expression* left, Token token)
{
UniquePtr<std::vector<Expression*>*> arguments = new std::vector<Expression*>;
if (!parser->MatchAndConsume(TokenType::RightParen))
{
do
{
arguments->push_back(parser->parseExpression(Precedence::ASSIGNMENT));
}
while( parser->MatchAndConsume(TokenType::Comma));
parser->Consume(TokenType::RightParen);
}
return new CallExpression(token, left, arguments.Release());
}
Expression* GroupParselet::parse(Parser* parser, Token token)
{
UniquePtr<Expression*> exp = parser->parseExpression();
parser->Consume(TokenType::RightParen);
return exp.Release();
}