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comp.lang.ruby

word_wrap method for String?

Jeff Coleman

3/13/2006 12:56:00 PM


Hi all,

For a text adventure program I'm working on I needed a method to word
wrap a long string based on spaces or non-word characters so I came up
with this. I just thought I'd post it to see if there are any thoughts
or if there might be a better way to do it.

class String
def word_wrap(width)
source = self.dup
original_width = width
while width < source.length do
last_space = source.rindex( / |\W/, width )
source.insert( last_space, "\n" )
source.gsub!(/\n */,"\n")
width = last_space + original_width
end
source
end
end

Jeff Coleman

--
Posted via http://www.ruby-....
9 Answers

Mike

3/13/2006 1:05:00 PM

0

> For a text adventure program I'm working on I needed a method
> to word wrap a long string based on spaces or non-word
> characters so I came up with this. I just thought I'd post
> it to see if there are any thoughts or if there might be a
> better way to do it.
>

I wrote one last week, actually

def wrap(wrap_len=78)
start_pos = wrap_len
while start_pos < @fact.length
sp = @fact.rindex(' ', start_pos)
@fact.insert(sp, '|')
start_pos = sp + wrap_len + 1
end
@fact.gsub!(/\|[\s]/, "\n")
end

I'm far from an expert, so I don't know which method may be better :)

-M

vanekl

3/13/2006 1:16:00 PM

0

Jeff Coleman

3/13/2006 1:24:00 PM

0

Lou Vanek wrote:
> here's a (partially modded) excerpt from a previous discussion on this
> topic:
>
> width = 11
> str = 'This is a test of the emergency broadcasting servicings I
> asseverate'
> p str.scan(/\S.{0,#{width}}\S(?=\s|$)|\S+/)

When I was writing that I just KNEW there must be some one-line solution
involving regular expressions!

Although I don't quite follow the exact structure of this one, it
definitely works...

Jeff

--
Posted via http://www.ruby-....

Matthew Harris

3/13/2006 1:34:00 PM

0

Mike wrote:
>> For a text adventure program I'm working on I needed a method
>> to word wrap a long string based on spaces or non-word
>> characters so I came up with this. I just thought I'd post
>> it to see if there are any thoughts or if there might be a
>> better way to do it.
>>
>
> I wrote one last week, actually
>
> def wrap(wrap_len=78)
> start_pos = wrap_len
> while start_pos < @fact.length
> sp = @fact.rindex(' ', start_pos)
> @fact.insert(sp, '|')
> start_pos = sp + wrap_len + 1
> end
> @fact.gsub!(/\|[\s]/, "\n")
> end
>
> I'm far from an expert, so I don't know which method may be better :)
>
> -M

class String
# Wrap string by the given length, and join it with the given
character.
# The method doesn't distinguish between words, it will only work based
on
# the length. The method will also strip and whitespace.
#
def wrap(length = 80, character = $/)
scan(/.{#{length}}|.+/).map { |x| x.strip }.join(character)
end
end

puts 'Hello, World! I am quite very long :)'.wrap(15, "<br>\n")

# Output:
#
# Hello, World! I<br>
# am quite very<br>
# long :)

Have fun =)

- Matt

--
Posted via http://www.ruby-....

vanekl

3/13/2006 1:47:00 PM

0

Jeff Coleman

3/13/2006 1:54:00 PM

0

Lou Vanek wrote:
> everthing old is new again.
> you might also want to compare speeds. Yours might be faster.
> -lv

It's my first time using the profiler, but if I'm reading this
correctly--

It took my version 27 seconds to do 6000 word_wraps. Your regexp
version did the same in 2.4 seconds :)

Jeff Coleman

--
Posted via http://www.ruby-....

vanekl

3/13/2006 2:07:00 PM

0

Daniel Harple

3/13/2006 2:28:00 PM

0

On Mar 13, 2006, at 1:56 PM, Jeff Coleman wrote:

> For a text adventure program I'm working on I needed a method to word
> wrap a long string based on spaces or non-word characters so I came up
> with this. I just thought I'd post it to see if there are any
> thoughts
> or if there might be a better way to do it.

This one is taken from facets[1]. I use it to wrap lines in TextMate.

def word_wrap(text, col_width=80)
text.gsub!( /(\S{#{col_width}})(?=\S)/, '\1 ' )
text.gsub!( /(.{1,#{col_width}})(?:\s+|$)/, "\\1\n" )
text
end

[1] gem install facets

-- Daniel

William James

3/13/2006 3:47:00 PM

0

Lou Vanek wrote:
> here's a (partially modded) excerpt from a previous discussion on this topic:
>
> width = 11
> str = 'This is a test of the emergency broadcasting servicings I asseverate'
> p str.scan(/\S.{0,#{width}}\S(?=\s|$)|\S+/)

When you modded, you didn't notice that 8 was 2 less than the width.

str =
'This is a test of the emergency broadcasting servicings I asseverate'
p str.scan(/\S.{0,#{width-2}}\S(?=\s|$)|\S+/)