private AstItem ReadExternFuncDecl(TokenIterator tokens)
{
tokens.PopExpected(TokenKind.Ext);
tokens.PopExpected(TokenKind.RoundBracketOpen);
var libFnName = tokens.PopExpected(TokenKind.String);
tokens.PopExpected(TokenKind.Comma);
var libName = tokens.PopExpected(TokenKind.String);
tokens.PopExpected(TokenKind.RoundBracketClose);
var name = tokens.PopExpected(TokenKind.Word);
tokens.PopExpected(TokenKind.RoundBracketOpen);
var parameters = ReadFuncParameters(tokens);
var next = tokens.Pop();
DataType returnType = DataType.VOID;
if (next.Kind == TokenKind.TypeOperator)
{
returnType = ReadDataType(tokens);
tokens.PopExpected(TokenKind.SemiColon);
}
return(AstItem.ExternFunctionDecl(name.Value, returnType, parameters, libFnName.Value, libName.Value));
}