Forum: Ruby Convert words to numbers and back?

I was wondering if somebody could give me some insight and help on how
to convert words to numbers and back again. Maybe a function?

Check http://www.deveiate.org/projects/Linguistics/
I think numwords is what you are looking for.

I don't know exactly what you mean.
Do you have something like: "123"  <- a String which you want to conert 
into
an integer? like 123 ?

if so, there are these functions:

str.to_i(base=10) => integer

Returns the result of interpreting leading characters in str as an 
integer
base base (2, 8, 10, or 16). Extraneous characters past the end of a 
valid
number are ignored. If there is not a valid number at the start of str, 
0 is
returned. This method never raises an exception.

   "12345".to_i             #=> 12345
   "99 red balloons".to_i   #=> 99
   "0a".to_i                #=> 0
   "0a".to_i(16)            #=> 10
   "hello".to_i             #=> 0
   "1100101".to_i(2)        #=> 101
   "1100101".to_i(8)        #=> 294977
   "1100101".to_i(10)       #=> 1100101
   "1100101".to_i(16)       #=> 17826049
orstr.to_f => floatReturns the result of interpreting leading characters 
in
str as a floating point number. Extraneous characters past the end of a
valid number are ignored. If there is not a valid number at the start of
str, 0.0 is returned. This method never raises an exception.
"123.45e1".to_f        #=> 1234.5
   "45.67 degrees".to_f   #=> 45.67
   "thx1138".to_f         #=> 0.0
bye sala----- Original Message -----
From: "Andrei Maxim" <andrei@andreimaxim.ro>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Saturday, November 24, 2007 2:05 PM
Subject: Re: Convert words to numbers and back?

I think the OP wants to know how he could turn 3 into "three" or 2001 
into
"two thousand and one".

2007/11/24, Andrei Maxim <andrei@andreimaxim.ro>:
> I think the OP wants to know how he could turn 3 into "three" or 2001 into
> "two thousand and one".

I could also imagine that the OP wants conversion of char sequences to
a single number (see below).

Amazing: three replies and three different interpretations of the 
question:

1. convert a textual number description into a number object

2. convert a string representation of a number into a number object

3. encode a char sequence in a single number (reminds me faintly of
Goedel numbers)

I'd say 1 and 3 can be matched to the OP's question, while 2 clearly
cannot with 1 having the highest likelyhood to match the actual
requirements.

Jordon, what is it that you are looking for?

Kind regards

robert

Hm, I'm pretty sure I meant " turn 3 into "three" or "two thousand and 
one"
into 2001". :)

2007/11/24, Andrei Maxim <andrei@andreimaxim.ro>:
> Hm, I'm pretty sure I meant " turn 3 into "three" or "two thousand and one"
> into 2001". :)

You are not the OP.

> > Amazing: three replies and three different interpretations of the
> > cannot with 1 having the highest likelyhood to match the actual
> > requirements.
> >
> > Jordon, what is it that you are looking for?

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ see what I mean?

robert

On 11/24/07, Robert Klemme <shortcutter@googlemail.com> wrote:
>
> 2007/11/24, Andrei Maxim <andrei@andreimaxim.ro>:
> > Hm, I'm pretty sure I meant " turn 3 into "three" or "two thousand and
> one"
> > into 2001". :)
>
> You are not the OP.
>

Gee, isn't that a surprise.

What I need to do is convert "22/11/2007" to 
"twenty-two/eleven/two-thousand-seven" and then convert it back to 
"22/11/2007", what I will be doing is building a plugin for Mephisto to 
highjack my archive URIs to words over numbers and then converting it 
back to Mephisto when it comes back in.  Out as word in as number.  That 
way no major changes have to be made to the backend itself.  It doesn't 
have to add in the dashes since I can simply do that with split (" ") 
and join ("-").  I did look into Linguistics but it is a one way 
conversion, I need 2 way conversion.  Thanks.

On Nov 25, 12:03 am, Jordon Bedwell <jor...@envygeeks.com> wrote:
> What I need to do is convert "22/11/2007" to
> "twenty-two/eleven/two-thousand-seven" and then convert it back to
> "22/11/2007", what I will be doing is building a plugin for Mephisto to
> highjack my archive URIs to words over numbers and then converting it
> back to Mephisto when it comes back in.  Out as word in as number.  That
> way no major changes have to be made to the backend itself.  It doesn't
> have to add in the dashes since I can simply do that with split (" ")
> and join ("-").  I did look into Linguistics but it is a one way
> conversion, I need 2 way conversion.  Thanks.

For 7 -> "seven" see:
http://www.rubyquiz.com/quiz25.html

The reverse would make a fun problem to solve, too.
Here, let me get you started:

ENGLISH_VALUE = {}
%w| zero one two three four five six seven eight nine ten eleven
    twelve thirteen fourteen fifteen sixteen seventeen eighteen
    nineteen |.each_with_index{ |word,i| ENGLISH_VALUE[word] = i }

%w| zero ten twenty thirty forty fifty sixty seventy eighty
    ninety|.each_with_index{ |word,i| ENGLISH_VALUE[word] = i*10 }
ENGLISH_VALUE['hundred'] = 100
%w| one thousand million billion trillion|.each_with_index{ |word,i|
  ENGLISH_VALUE[word] = 10**(i*3)
}

class Integer
  def self.from_english( words )
    values = words.downcase.split( /\W+/ ).map{ |word|
      ENGLISH_VALUE[word]
    }
    # Put your magic here
  end
end

TESTS = {
  'one'=>1,
  'seventy three'=>73,
  'ninety nine'=>99,
  'one hundred'=>100,
  'one hundred one'=>101,
  'one hundred twenty'=>120,
  'three hundred sixty four'=>364,
  'eight thousand five'=>8_005,
  'forty-three thousand twelve'=>43_012,
  'two billion one hundred thousand seventeen'=>2_000_100_117
}

TESTS.each{ |word,expected_value|
  actual_value = Integer.from_english( word )
  unless actual_value == expected_value
    warn "From '#{word}', " <<
         "expected: #{expected_value}, " <<
         "actual: #{actual_value.inspect}"
  end
}

#=> From 'forty-three thousand twelve', expected: 43012, actual: [40,
3, 1000, 12]
#=> From 'one hundred one', expected: 101, actual: [1, 100, 1]
#=> From 'ninety nine', expected: 99, actual: [90, 9]
#=> From 'one', expected: 1, actual: [1]
#=> From 'eight thousand five', expected: 8005, actual: [8, 1000, 5]
#=> From 'one hundred twenty', expected: 120, actual: [1, 100, 20]
#=> From 'two billion one hundred thousand seventeen', expected:
2000100117, actual: [2, 1000000000, 1, 100, 1000, 17]
#=> From 'three hundred sixty four', expected: 364, actual: [3, 100,
60, 4]
#=> From 'one hundred', expected: 100, actual: [1, 100]
#=> From 'seventy three', expected: 73, actual: [70, 3]