// <-- Name
// | FN Name TupleType
// | BOOL_LITERAL
// | INT_LITERAL
// | STRING_LITERAL
// | LPAREN (Expression)? RPAREN
private IUnboundExpr PrimaryExpr()
{
IUnboundExpr expression;
if (CurrentIs(TokenType.Name))
{
var name = Consume();
expression = new NameExpr(name.Position, name.StringValue, TypeArgs());
}
else if (CurrentIs(TokenType.Fn))
{
expression = FuncExpr();
}
else if (CurrentIs(TokenType.Bool))
{
expression = new BoolExpr(Consume(TokenType.Bool));
}
else if (CurrentIs(TokenType.Int))
{
expression = new IntExpr(Consume(TokenType.Int));
}
else if (CurrentIs(TokenType.String))
{
expression = new StringExpr(Consume(TokenType.String));
}
else if (CurrentIs(TokenType.LeftParen))
{
Token leftParen = Consume(TokenType.LeftParen);
if (CurrentIs(TokenType.RightParen))
{
// () -> unit
expression = new UnitExpr(leftParen.Position);
}
else if (CurrentIs(TokenType.Operator))
{
// ( OPERATOR ) -> an operator in prefix form
Token op = Consume(TokenType.Operator);
expression = new NameExpr(op.Position, op.StringValue);
}
else
{
// anything else is a regular parenthesized expression
expression = Expression();
}
Consume(TokenType.RightParen);
}
else
{
expression = null;
}
return(expression);
}
bool IBoundExprVisitor <bool> .Visit(IntExpr expr)
{
Write(OpCode.PushInt, expr.Value); return(true);
}
public virtual IUnboundExpr Transform(IntExpr expr)
{
return(expr);
}
IBoundExpr IUnboundExprVisitor<IBoundExpr>.Visit(IntExpr expr)
{
return expr;
}
IUnboundExpr IUnboundExprVisitor <IUnboundExpr> .Visit(IntExpr expr)
{
return(Call("IntExpr", expr));
}