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Seb
Wizard
Joined: 14 Aug 2004
Posts: 1269
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 Posted: Sat Nov 03, 2007 4:16 pm
[2.10] %mapquery removes whitespace unless in double quotes
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There appear to be some parsing problems in CMUD with %mapquery():-
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1.
#show %mapquery(Name='The West Road')
Compiles to:
0000 STR 'Name='TheWestRoad''
0028 FUNCREF mapquery (1)
0040 CMD show (1)
Spaces have been removed from the query. Note that the documentation says to use single quotes. Double quotes currently work better...
2.
#show %mapquery(Zoneid=%zonenum() AND Name="The West Road")
Compiles to:
0000 STR 'Zoneid='
0016 FUNCREF zonenum (0)
0028 CONCAT
0032 STR 'ANDName="The West Road"'
0064 CONCAT
0068 FUNCREF mapquery (1)
0080 CMD show (1)
Notice there is no space between AND and Name. Similar results for:
#show %mapquery(Zoneid=%zonenum() AND NOT Name="The West Road")
3.
#show %mapquery(Zoneid=%zonenum() {AND Name="The West Road"})
and even:
#show %mapquery(Zoneid=%zonenum() {AND }Name="The West Road")
Do not compile, with error "unmatched parenthesis".
This one works:
#show %mapquery(Zoneid=%zonenum() "AND "Name="The West Road") |
The problem is that %mapquery currently removes whitespace (even stuff in single quotes).
CMUD 2.10 (and CMUD 2.07 and 1.34) on WinXP SP2. |
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Zugg
MASTER
Joined: 25 Sep 2000
Posts: 23379
Location: Colorado, USA
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Posted: Sat Nov 03, 2007 5:15 pm
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That's because %mapquery takes a string argument. The proper syntax in CMUD would be:
| Code: |
| #show %mapquery("Name='The West Road'") |
Sorry, but CMUD is just pickier about string values. Outside of quotes (or {}) spaces are stripped. Because %mapquery is still an old mapper function ported from zMUD, it isn't taking an "expression" as the argument, it's still just taking a string value.
Single quotes have no meaning in CMUD at all...it's just another character. |
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Iceclaw
Apprentice
Joined: 11 Sep 2005
Posts: 124
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Posted: Sat Nov 03, 2007 6:24 pm
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That explains it. Perhaps the %mapquery() Documentation could be updated to reflect this, with examples of how to make AND work properly (because of the automatic Concat issues)
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Fang Xianfu
GURU
Joined: 26 Jan 2004
Posts: 5155
Location: United Kingdom
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Posted: Sat Nov 03, 2007 6:30 pm
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Try concating explicitly as I've suggested in the original thread - if that works, I'll change the help.
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Seb
Wizard
Joined: 14 Aug 2004
Posts: 1269
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Posted: Sat Nov 03, 2007 8:59 pm
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Well, {} doesn't work in it either, so {} obviously doesn't always work as a string operator.
| Code: |
#show %mapquery({Zoneid=123 AND Name='The West Road'})
0000 STR 'Zoneid=123ANDName='TheWestRoad''
0040 VARTYPE String
0048 FUNCREF mapquery (1)
0060 CMD show (1) |
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Fang Xianfu
GURU
Joined: 26 Jan 2004
Posts: 5155
Location: United Kingdom
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Posted: Sat Nov 03, 2007 9:09 pm
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I think that's probably more to do with the context that you're using {} in - it's supposed to be used to group arguments to commands, not arguments to functions. An argument to a command is another command (or a number of them), whereas an argument to a function is always some kind of value, so there's a difference.
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Seb
Wizard
Joined: 14 Aug 2004
Posts: 1269
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Posted: Sat Nov 03, 2007 9:20 pm
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I thought {} was supposed to be the same as "", in CMUD, but expand variables and functions?
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Fang Xianfu
GURU
Joined: 26 Jan 2004
Posts: 5155
Location: United Kingdom
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Posted: Sat Nov 03, 2007 9:32 pm
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Well, you've just proved that that's not true :P I'm assuming based on the facts that all the examples Zugg has given when he's said that have been commands and that it's not working in this case.
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Vijilante
SubAdmin
Joined: 18 Nov 2001
Posts: 5182
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Posted: Sat Nov 03, 2007 9:36 pm
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I know explicit concatenation works through %concat. I use that with %mapquery in my scripts without any problems. From what Zugg is saying I would expect that other functions likely do the same thing. This is the first anyone has mentioned it as a problem.
Unless this suddenly started happening with 2.10 I do not believe it is a bug. Currently all the examples in the help also show the parameter in quotes, and that topic has not been updated in anyway for CMud. |
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Seb
Wizard
Joined: 14 Aug 2004
Posts: 1269
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Posted: Sat Nov 03, 2007 9:55 pm
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Hmm, well I did go from the wrong starting point - someone's forum post rather than the manual (and assumed they were following the manual). But I am curious about the issue with braces...
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Arde
Enchanter
Joined: 09 Sep 2007
Posts: 605
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Posted: Sat Nov 03, 2007 10:57 pm
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Seb
May be you just had red an arcticle in manual that still uses ' in its samples and when you get to write your script you remember that? |
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Seb
Wizard
Joined: 14 Aug 2004
Posts: 1269
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Posted: Sun Nov 04, 2007 3:11 am
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No, I was just extending the code in here, trying to add a second term to the query that Iceclaw already had.
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Zugg
MASTER
Joined: 25 Sep 2000
Posts: 23379
Location: Colorado, USA
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Posted: Mon Nov 05, 2007 5:35 pm
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Unfortunately {} doesn't work in all cases as string delimiters, especially in old functions that were directly ported from zMUD (like the mapper stuff). And in function calls you need to use " quotes, or use %concat explicitly
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