public static Node GetNode(this ExpressionType et, List <Token <TokenType> > expr, LexerPosition exprPos, ref InterpreterState state)
{
if (et.IsBlock())
{
bool hasArg = et != ExpressionType.ELSE;
List <List <Token <TokenType> > > args = new List <List <Token <TokenType> > >();
if (hasArg)
{
args = Interpreter.GetArgs(expr);
}
switch (et)
{
case ExpressionType.ELSE:
return(new ElseNode(exprPos));
case ExpressionType.IF:
args.ThrowIfNotSize(exprPos, 1);
return(new IfNode(args.First(), IfNode.IsElseIf(expr), exprPos));
case ExpressionType.LOOP:
args.ThrowIfNotSize(exprPos, 1);
return(new LoopNode(args.First(), exprPos));
case ExpressionType.WHILE:
args.ThrowIfNotSize(exprPos, 1);
return(new WhileNode(args.First(), exprPos));
case ExpressionType.FUNCTION_DEFINITION:
return(new FunctionDefinitionNode(
expr[1].StringWithoutQuotes,
args.Select(a => a.AsString()).ToArray(),
exprPos
));
}
}
else
{
switch (et)
{
case ExpressionType.IMPORT:
return(new ImportNode(expr[1].StringWithoutQuotes, exprPos));
case ExpressionType.RETURN:
return(new ReturnNode(expr.Skip(1).Reverse().Skip(1).Reverse().ToList(), exprPos));
case ExpressionType.BREAK:
return(new BreakNode(exprPos));
case ExpressionType.CONTINUE:
return(new ContinueNode(exprPos));
case ExpressionType.FUNCTION_CALL:
string name = expr[0].StringWithoutQuotes;
bool isSysFunc = state.Functions.Any(f => f.Name == name);
if (isSysFunc)
{
return(new FunctionCallNode(
state.Functions.First(f => f.Name.Equals(name)),
Interpreter.GetArgs(expr),
exprPos
));
}
else if (state.UserFuncs.Any(f => f.Name == name))
{
return(new FunctionCallNode(
state.UserFuncs.First(f => f.Name == name),
Interpreter.GetArgs(expr),
exprPos
));
}
throw new InterpreterException($"Unkown function \"{name}\" at {exprPos}");
case ExpressionType.ASSIGNMENT:
bool isArray = AssignmentNode.IsArrayAssignment(expr, out bool isIndexer);
return(new AssignmentNode(
expr[0].StringWithoutQuotes,
isIndexer ?
AssignmentNode.GetValueOfIndexerAssignment(expr) :
expr.Skip(2).Reverse().Skip(1).Reverse().ToList(),
isArray,
isIndexer,
isIndexer ? AssignmentNode.GetIndex(expr) : new List <Token <TokenType> >(),
exprPos
));
case ExpressionType.INCREMENT:
return(new IncrementNode(expr[0].StringWithoutQuotes, exprPos));
case ExpressionType.DECREMENT:
return(new DecrementNode(expr[0].StringWithoutQuotes, exprPos));
}
}
return(null);
}
