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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0000808||Core Inform||Understanding||public||2011-11-21 08:45||2014-05-07 07:34|
|Target Version||Fixed in Version||6L02|
|Summary||0000808: Scope test in a parse_name causes the parser to hang|
|Description||In the sample below, "x anne" sends the parser into an infinite loop. (Not an infinite recursion, mind you.) A generated Parse_Name_ routine gets stuck in a while(true).|
The parse_name routine of the crowd does a visibility test, which means a scope test; that invokes PlaceInScope. The first line of PlaceInScope resets wn. Thus the parse_name routine never makes progress through the input buffer.
I'd say the fix was to remove that line from PlaceInScope, but I really have no idea what it's doing there. Maybe it's important and the fix should be something else.
|Minimal Source Text To Reproduce|
Main Road is a room. Anne is a woman. Understand "woman" as Anne. The Dummy is a thing. The crowd is a plural-named person, here. Understand "Anne" as the crowd when the player cannot see Anne. After deciding the scope of the player (this is the place dummy in scope rule): place dummy in scope.
|Tags||No tags attached.|
|Effect||(serious/mild) Game compiles but misbehaves|
Calling the rule "place dummy in scope" which coincides with the command to be executed makes it look like a recursion. I know you are not saying:
After deciding the scope of the player (this is the place dummy in scope rule): follow the place dummy in scope rule.
But it's confusingly close.
|PlaceInScope now saves wn and restores it after the call terminates; I can't believe it was ever intended to change the state of wn other than for its own private purposes, so this seems safe enough. It fixes the problem.|
|2011-11-21 08:45||zarf||New Issue|
|2011-11-21 09:03||soukie||Note Added: 0001465|
|2011-11-22 12:36||EmacsUser||Status||new => confirmed|
|2012-06-11 02:25||infoqw||Note Added: 0001682|
|2012-06-11 02:26||infoqw||Note Edited: 0001682|
|2012-06-11 05:40||EmacsUser||Note Deleted: 0001682|
|2012-06-11 14:55||EmacsUser||Note Revision Dropped: 1682: 0000694|
|2014-01-15 10:19||graham||Note Added: 0002295|
|2014-01-15 10:19||graham||Status||confirmed => resolved|
|2014-01-15 10:19||graham||Resolution||open => fixed|
|2014-01-15 10:19||graham||Assigned To||=> graham|
|2014-05-07 07:34||jmcgrew||Fixed in Version||=> 6L02|
|2014-05-07 07:34||jmcgrew||Status||resolved => closed|
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