Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

I haven't looked at your code in detail yet, nor tried to use the interface you've got already, specifically so that I would not be influenced.

My first thought on how I would like to use a conversions module is that I would pass the source and destination units and it would create a named sub in my package namespace (like use constant does).

In use, it might look something like this:

# if (units) specified after text unit description # (which should understand most normal abbrevs.) # then if the input is a string it is inspected for units, # and the conversion done in the appropriate direction # If the input is purely numeric (if ONLY Perl_looks_like_number() was + accessible!) # then the conversion is in the direction specified by the order of de +claration time parameters. use Units::Convert FT_IN_2_MTRS => q[ft(')inches(") meters(m)]; print FT_IN_2_MTRS q{5'10"}; # prints '1.7773m' print FT_IN_2_MTRS 5.8333; # prints 1.77773 # No (units) specified on delclaration, input must be numeric, convers +ion works in 1 direction only. use Units::Convert MPH_2_KPH => q[mph kph]; print MPH_2_KPH 70; # prints 112 print MPH_2_KPH '70mph'; # Causes warn or die my @limits = qw(30 40 50 60 70); print "@{[ MPH_2_KPH @limits ]}"; # prints 50 64 80 96 112 # An extension would be for the user to supply a sprintf-style format +string # that is used for the formating/precision of the output. # Once we get string .v. numeric contexts, the sub could determine whe +n to append the units or not use Units::Convert CI_2_CC => 'inch^3(%.2f ci) cm^3(%.f cc)'; print CI_2_CC 500; # prints 8183 print CI_2_CC '500 ci'; # prints '8183 cc' # If an itermediate conversion is required, this could be specified on + the declaration # I'm not sure this is a good example, but it's the one that came to m +ind. use Units::Convert UK_2_METRIC_WEIGHTS => 'stones(st)_pounds(lbs) lbs +kilograms(%.1f kilos)'; print UK_2_METRIC_WEIGHTS '11st 7lbs'; # prints '73.2 kilos' print UK_2_METRIC_WEIGHTS 11.5; # prints 73.2 print UK_2_METRIC_WEIGHTS '11.5_'; # prints '73.2 kilos' maybe? # The presence of an underscore forces output formattting (if supplied +)?

Final thought on the precision and under/overflow thing. Perhaps, if a flag is set, the routines could return BigInt/Floats if the standrad precisions will cause accuracy loss? I haven't thought that through, so I don't know what the implications are.

Now I'll read your code and see if I'm completly off-base, but I like to look at things from my own perspective first when I can :^).

If you decide not to go ahead with teh module, let me know and I will.


Examine what is said, not who speaks.


In reply to Re: Re^2: The Definitive Unit Conversion Script by BrowserUk
in thread The Definitive Unit Conversion Script by Aristotle

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (18)
    As of 2015-07-01 20:10 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (19 votes), past polls