OpenEuphoria

Re: help with storing user input

• Posted by Jason Dube <dubetyrant at hotmail.com> May 17, 2003
• 415 views

Hey,
I know your not responsible for teaching me to code with euphoria, but this 
algoritm uses the language in a lot of ways I couldn't imagine. This part of 
the code is kinda confusing for me, in order to understand the big for 
statement that follows, dont I have to find out whats going on with this 
pquotes variable?

-Basically I'm wondering what kinds of parameters the caller of this 
function would  specify for pquotes.

> >     -- Validate quote marks parameter
> >     if     sequence(pQuotes) then
> >  if length(pQuotes) = 0 then

--excuse me if I dont know euphoria syntax that well, but how could the 
length of pquotes possibly be zero. This function has to take four arguments 
right?In my mind control would never be passed here because euphoria wont 
run this program without getting four arguments.(Thinking out loud)so this 
line is simply testing to see if the caller has specified {} an empty 
sequence as a parameter?

> >      pQuotes = {{},{},{},{},{}}

ok, so now it has five empty sequences in it, why?

> >  elsif (length(pQuotes) != 5


> >   or
> >         atom(pQuotes[1])
> >   or
> >         atom(pQuotes[2])
> >   or
> >         atom(pQuotes[3])
> >   or
> >         length(pQuotes[1]) != length(pQuotes[2])
> >   or
> >         atom(pQuotes[4])
> >   or
> >         atom(pQuotes[5])
> >   or
> >         length(pQuotes[4]) != length(pQuotes[5])
> >      )
> >  then
> >      pQuotes = 0
> >  end if
> >     end if

--no idea why to test for all these things
> >
> >     if atom(pQuotes) then
> >  if pQuotes = 0 then
> >      pQuotes = {"\"'`", "\"'`", "\\~","",""}
> >  else
> >      pQuotes = {{pQuotes}, {pQuotes},{},{},{}}
> >  end if
> >     end if

-no clue:)

>
>This is just validating and initializing the pQuotes group of data.
>  pQuotes[1] and [2] is a pair of character sets. [1] is the start quote 
>and
>[2] is the matching end quote. All the characters inside the quotes is
>considered to be a word.

okay I understand what your saying here...Im just not getting how you made 
that happen with your code.
>
>  pQuotes[3] is a list of characters that are 'escape' characters to be 
>used
>inside quoted strings. For example...


--so an escape character like ~ would be listed as a seperate sequence?

>
>    'abc~'def'
>
>with pQuotes = { "'", "'", '~', ...}
>
>gives the word value as abc'def
ok
>

--Overall I think I'll just use the simpler function, Im really not able yet 
to understand this function. I do understand the simpler one though!!

--Thanks for taking the time to explain, I'll probably be able to figure it 
out sometime:)

--And I'll make sure to credit you wherever I use it(the simpletokenize, 
that is)

_________________________________________________________________
Add photos to your e-mail with MSN 8. Get 2 months FREE*.  
http://join.msn.com/?page=features/featuredemail