// Generic function that handles ENDFILE, BACKSPACE and REWIND since they
// all take the exact same parameters.
ParseNode PositionStatement(string keyword)
{
ExtCallParseNode node = new ExtCallParseNode("JComLib.IO,jcomlib", keyword);
InitFunctionNodes();
ControlList cilist = ParseCIList(_posFunction.ParameterList);
if (cilist == null) {
SkipToEndOfLine();
return null;
}
if (cilist["UNIT"] == null) {
_messages.Error(MessageCode.UNITREQUIRED, "UNIT specifier required for REWIND");
return null;
}
node.Parameters = _posFunction.ParametersNode(cilist);
// Wrap into a conditional if an ERR label is specified.
if (cilist.Has("ERR")) {
SwitchParseNode switchNode = new SwitchParseNode();
switchNode.CompareExpression = node;
switchNode.Add(new NumberParseNode(-1), cilist["ERR"]);
return switchNode;
}
return node;
}
/// INQUIRE keyword
/// Inquire of the state of a file.
ParseNode KInquire()
{
ExtCallParseNode node = new ExtCallParseNode("JComLib.IO,jcomlib", "INQUIRE");
InitFunctionNodes();
ControlList cilist = ParseCIList(_inquireFunction.ParameterList);
if (cilist == null) {
SkipToEndOfLine();
return null;
}
node.Parameters = _inquireFunction.ParametersNode(cilist);
// Wrap into a conditional if an ERR label is specified.
if (cilist.Has("ERR")) {
SwitchParseNode switchNode = new SwitchParseNode();
switchNode.CompareExpression = node;
switchNode.Add(new NumberParseNode(-1), cilist["ERR"]);
return switchNode;
}
return node;
}