private object Visit(BlockNode node)
{
object result = null;
foreach (var child in node.Block)
{
if (child is ReturnNode)
{
result = Visit(child);
}
else
{
Visit(child);
}
}
return(result);
}
private SyntaxNode Statement(Parser.ParserInstance parser)
{
if (parser.Current.TypeId == Program.LBlock)
{
return(Block(parser));
}
else if (parser.Current.TypeId == Program.Variable)
{
parser.ConsumeToken();
return(VariableDeclaration(parser, TypeNode.Inferred));
}
else if (parser.Current.TypeId == Program.Identifier)
{
var ident = (string)parser.Current.Value;
parser.ConsumeToken(Program.Identifier);
if (parser.Current.TypeId == Program.LParen) // FUNC-INVOKE
{
return(FunctionInvoke(parser, ident));
}
else if (parser.Current.TypeId == Program.Assign) // ASSIGN
{
return(Assignment(parser, new VariableNode(ident)));
}
else if (parser.Current.TypeId == Program.Identifier)
{
return(VariableDeclaration(parser, new TypeNode(ident)));
}
// increment-by, decrement-by, multiply-by, divide-by
}
else if (parser.Current.TypeId == Program.Func) // FUNC-DEFINE
{
parser.ConsumeToken(); // consume the FUNC
var returnType = new TypeNode((string)parser.Current.Value);
parser.ConsumeToken(); // Consume the Return Type
var ident = (string)parser.Current.Value;
parser.ConsumeToken(Program.Identifier);
parser.ConsumeToken(Program.LParen);
var parameters = new List <FunctionParameterDefinitionNode>();
while (parser.Current.TypeId != Program.RParen)
{
if (parser.Current.TypeId == Program.Comma)
{
parser.ConsumeToken();
}
var paramType = new TypeNode((string)parser.Current.Value);
parser.ConsumeToken();
var paramName = (string)parser.Current.Value;
parser.ConsumeToken();
parameters.Add(new FunctionParameterDefinitionNode(paramName, paramType));
}
parser.ConsumeToken(Program.RParen);
BlockNode body = null;
if (parser.Current.TypeId == Program.LBlock)
{
body = Block(parser);
}
else if (returnType.Name != "void" && parser.Current.TypeId != Program.Return)
{
body = new BlockNode(new ReturnNode(Expression(parser)));
}
else
{
body = new BlockNode(Statement(parser));
}
return(new FunctionDefinitionNode(ident, returnType, parameters.ToArray(), body));
}
else if (parser.Current.TypeId == Program.TypeOf)
{
parser.ConsumeToken();
parser.ConsumeToken(Program.LParen);
var expression = Expression(parser);
parser.ConsumeToken(Program.RParen);
return(new TypeOfNode(expression));
}
else if (parser.Current.TypeId == Program.Return)
{
parser.ConsumeToken();
return(new ReturnNode(Expression(parser)));
}
else if (parser.Current.TypeId == Program.Branch)
{
parser.ConsumeToken();
return(Branch(parser));
}
else if (parser.Current.TypeId == Program.Loop)
{
parser.ConsumeToken();
var numberOfLoops = Expression(parser);
if (parser.Current.TypeId == Program.LBlock)
{
return(new LoopNode(numberOfLoops, Block(parser)));
}
else
{
return(new LoopNode(numberOfLoops, Statement(parser)));
}
}
else if (parser.Current.TypeId == Program.Print)
{
parser.ConsumeToken();
return(new PrintNode(Expression(parser)));
}
return(new NoOpNode());
}
public FunctionDefinitionNode(string name, TypeNode returnType, FunctionParameterDefinitionNode[] parameters, BlockNode body)
{
FunctionName = name;
ReturnType = returnType;
Parameters = parameters;
Body = body;
}