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kc7aad
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Joined: 09 Oct 2005
Posts: 53
Location: Spokane Washington
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 Posted: Sun Nov 25, 2007 8:21 am Post subject: I just can't grasp PARSE!! |
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So I have used it with some code help from others before, but i'm trying to understand it! I just can't get it for some reason, and what ever I try, doesn't seem to work!!!!!!!
So.. I understand having to load files, and searching for things in a string.. Got that!
I use
PARSE "%1,%2,%3,%4",%5
BUT WHAT DO THEY MEAN?? I think %5 is the piece of the string that I supposedly want, but don't know for sure.
So lets say I have a text file called test.txt and the first line in it looks like this:
1 2 3 4 5 6 7 8 9 10
Now I want to parse this line into different variables, and I really want to know what the 5th item in this line is. In this case, looking at the file, I could tell you it is "5", but how to do in VDS, and say send it to and Info line??
Can someone help me understand this? PLEASE!! And evidently in Kindergarden-VDS! 'Cause I don't get VDS-101!!
Thanks in advance.
Rod |
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uvedese
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Joined: 21 Jan 2006
Posts: 169
Location: Spain
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| Posted: Sun Nov 25, 2007 8:48 am Post subject: |
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Hi kc7aad:
I see that you are a little tied...
In the first line in your txt file: 1 2 3 4 5 6 ... the arguments are separated by spaces, them, you must indicate to VDS the field separator character (default is |). I suppose that you have loaded the txt file in the list 1.
| Code: | option fieldsep,@chr(32)
parse "%1;%2;%3;%4;%5",@item(1,0)
option fieldsep,|
# Default field separator charapter |
Now the variable %5 contains the fifth argument.
Good luck
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uVeDeSe
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visit: http://www.uvedese.es
Last edited by uvedese on Wed Apr 02, 2008 7:25 pm; edited 1 time in total |
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DaveR
Valued Contributor
Joined: 03 Sep 2005
Posts: 413
Location: Australia
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| Posted: Sun Nov 25, 2007 9:09 am Post subject: Re: I just can't grasp PARSE!! |
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| kc7aad wrote: | I use
PARSE "%1,%2,%3,%4",%5
BUT WHAT DO THEY MEAN?? I think %5 is the piece of the string that I supposedly want, but don't know for sure. |
Rod,
%5 in your example holds the string that you want to parse.
Try this:
| Code: | %%string = one|two|three
option fieldsep,|
parse "%1,%2,%3",%%string
info %1 @cr()%2 @cr()%3
|
%1 now = one
%2 now = two
%3 now = three
_________________
cheers
Dave |
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Skit3000
Admin Team
Joined: 11 May 2002
Posts: 2166
Location: The Netherlands
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| Posted: Sun Nov 25, 2007 4:54 pm Post subject: |
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| Code: | | parse "%1,%2,%3",%%string |
The reason the %1,%2,%3 should be between quotes is that the VDS interpreter has to read the names of the variables so it can put the parsed data inside the correct variables. Because of the quotes the variables will be read as text insteed of replaced by their values.
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[ Add autocomplete functionality to your VDS IDE windows! ]
Voor Nederlandse beginners met VDS: bekijk ook eens deze tutorial! |
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kc7aad
Contributor
Joined: 09 Oct 2005
Posts: 53
Location: Spokane Washington
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| Posted: Mon Nov 26, 2007 5:17 am Post subject: |
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| Thanks Guys!! I was on the right track, just had some syntax wrong, and it wasn't workign quite the way I thought it should. |
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Aslan
Valued Contributor
Joined: 31 May 2001
Posts: 589
Location: Memphis, TN USA
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| Posted: Mon Nov 26, 2007 5:45 am Post subject: Re: I just can't grasp PARSE!! |
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Edit: Sorry, I see you respoded while I was writing this but maybe it will help someone else 
Edit 2: OM*G Uvedese, I never until now noticed the additional options in the @Item() function. 
| From the help file wrote: | | "The optional second parameter of @ITEM (i, x) allows you to retrieve an item from a list randomly without having to seek to that item first." |
| kc7aad wrote: |
So lets say I have a text file called test.txt and the first line in it looks like this:
1 2 3 4 5 6 7 8 9 10
Now I want to parse this line into different variables, and I really want to know what the 5th item in this line is. In this case, looking at the file, I could tell you it is "5", but how to do in VDS, and say send it to and Info line??
Rod |
Let's create an example based on the criteria you provided.
| Code: | REM Create a list to hold test.txt
List Create,1
REM Normaly the next line would be "List Loadfile,1,<path to test.txt>"
REM But we will instead simulate it for this example
List add,1,"1 2 3 4 5 6 7 8 9 10"
REM Since you stated the above was the first line we need to set the
REM index pointer of list "1" to the first line
List seek,1,0
REM Since there is a <space> separating your numbers we set the
REM separater as a <space> which in ASCII is 032 (The default is a vertical bar "|" eg. 1|2|3|4|5|etc...)
REM The VDS equivilent for a space is @chr(32)
REM You might even be able to use a space with quotes at each end " "
REM Here are some common separaters(aka delimiters) @tab() @chr(32) ";" ":" "," "|"
Option Fieldsep,@chr(32)
REM Next we parse the string in list "1" that is at the current index.
REM The list of variables you want to use must be separated by a semicolon ";" and
REM enclosed with quotes so that VDS sees them as variable names instead if their values.
REM VDS will then fill each variable with the contents of each field respectfully.
Parse "%1;%2;%3;%4;%5;%6;%7;%8;%9;%A", @item(1)
REM Let's see what we got...
Info "%1" = %1@cr()"%2" = %2@cr()"%3" = %3@cr()"%4" = %4@cr()"%5" = %5@cr()"%6" = %6@cr()"%7" = %7@cr()"%8" = %8@cr()"%9" = %9@cr()"%A" = %A
REM Alternately, you could just get the fifth field if that's all you need.
Parse ";;;;%%ThisOneOnly",@item(1)
Info "%%ThisOneOnly" = %%ThisOneOnly
Exit |
I hope that was Kindergarden enough for you 
Have fun |
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