How do you do it??

Bob Sneidar bobs at twft.com
Tue Dec 27 12:09:01 EST 2011


Oh sorry ignore my last post. 

Bob


On Dec 23, 2011, at 6:50 PM, DunbarX at aol.com wrote:

> Of course.
> 
> 
> I have overdone the "do" construction by not including the whole statement in quotes. I am so used to having to break out literals from variables, reassembling them meticulously into a single line, that I missed this very expected result.
> 
> 
> Thanks...
> 
> 
> Craig
> 
> 
> 
> -----Original Message-----
> From: Bob Sneidar <bobs at twft.com>
> To: How to use LiveCode <use-livecode at lists.runrev.com>
> Sent: Fri, Dec 23, 2011 1:20 pm
> Subject: Re: How do you do it??
> 
> 
> Hmmm lemme follow this as pseudo code:
> 
> when the mouse is clicked
> put "AA" and a carriage return and "BB" into the variable "it"
> on the first pass of a repeat loop, try to do the command put followed by the 
> word "it" followed by the contents of the variable "it" (it's two lines you 
> know) followed by into "temp1". The statement you are trying to "do" will look 
> like this:
> 
> do put AA
> BB into temp1
> 
> Well you see what went wrong don't you? The do command does not know what to do 
> with what comes after AA. It cannot even compile it. This is why it is a MUCH 
> better idea to put your command into a variable, and then do the variable. You 
> could then have stepped through the code and seen what the DO command looked 
> like before you tried to "do" it. It may seem like wisdom at first to try to 
> mash all the code into one compact statement, but there is no gain in 
> performance, and there is a HUGE downside of not being able to debug it. 
> 
> Try this instead:
>> on mouseUp
>>  get "AA" & return & "BB"
>>  -- get "AA"
>>  repeat with y = 1 to 2
>>     put "put" && line y of it && "into temp" & y into theCommand
>>     do theCommand
>>  end repeat
>>  answer temp1 & comma & temp2
>> end mouseUp
> 
> 
> You will get "AA,BB"
> Bob
> 
> 
> 
> On Dec 23, 2011, at 1:43 PM, DunbarX at aol.com wrote:
> 
>> 
>> 
>> Why do LC (and HC for that matter) fail to process multi-line variables when 
> using "do"?
>> 
>> 
>> If the variable "it" contains one line, the "do" construction
>> works fine, making numbered temp variables as needed. But if I try the routine 
> with a multi-line "it", the handler
>> will not compile.
>> LC complains as: execution error at line 5 (do: error in source expression) 
> near "put AA", char 1
>> HC complains as well, that it cannot understand "BB".
>> 
>> 
>> 
>> It seems that the routine breaks simply because of the other lines, that is,
>> the next line in "it" is not understandable by the parser. I wonder why it 
> bothers to look there.
>> 
>> 
>> 
>> Don't tell me I need two levels of "do": (do "do put...)     Just kidding, 
> that fails also.
>> 
>> 
>> Just asking.
>> 
>> 
>> Craig Newman
>> 
>> 
>> 
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