Word wrap: Difference between revisions

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[[Category:Text processing]]

Even today, with proportional fonts and complex layouts, there are still [[Template:Lines_too_long|cases]] where you need to wrap text at a specified column. The basic task is to wrap a paragraph of text in a simple way in your language. If there is a way to do this that is built-in, trivial, or provided in a standard library, show that. Otherwise implement the [http://en.wikipedia.org/wiki/Word_wrap#Minimum_length minimum length greedy algorithm from Wikipedia.]

Even today, with proportional fonts and complex layouts, there are still [[Template:Lines_too_long|cases]] where you need to wrap text at a specified column.

The basic task is to wrap a paragraph of text in a simple way in your language.

If there is a way to do this that is built-in, trivial, or provided in a standard library, show that. Otherwise implement the [http://en.wikipedia.org/wiki/Word_wrap#Minimum_length minimum length greedy algorithm from Wikipedia.]

Show your routine working on a sample of text at two different wrap columns.

'''Extra credit!''' Wrap text using a more sophisticated algorithm such as the Knuth and Plass TeX algorithm. ~~If your language provides this, you get easy extra credit, but you ''must reference documentation'' indicating that the algorithm is something better than a simple minimimum length algorithm.~~

'''Extra credit!''' Wrap text using a more sophisticated algorithm such as the Knuth and Plass TeX algorithm.

If your language provides this, you get easy extra credit,

but you ''must reference documentation'' indicating that the algorithm

is something better than a simple minimimum length algorithm.

If you have both basic and extra credit solutions, show an example where ~~the two algorithms give different results.~~

If you have both basic and extra credit solutions, show an example where

the two algorithms give different results.

=={{header|Ada}}==

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end Wrap;</lang>

~~Output,~~ set to 72 lines (with input picked by cut-and-paste from the task description):

{{out}} set to 72 lines (with input picked by cut-and-paste from the task description):

<pre>Even today, with proportional fonts and complex layouts, there are still

cases where you need to wrap text at a specified column. The basic task

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return, Result

}</lang>

<pre>72

In olden times when wishing still helped one, there lived a king whose

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& out$(str$("\n80 columns:\n" wrap$(!Text.80)))

);</lang>

Output:

<pre>72 columns:

In olden times when wishing still helped one, there lived a king whose

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}

}</lang>

Output:

<pre>------------------------------------------------------------------------

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas varius

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(println line))</lang>

Output :

<pre>In olden times when wishing still helped one, there lived a king whose

daughters were all beautiful, but the youngest was so beautiful that the

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printfn ""

0</lang>

Output

<pre style="font-size:smaller">------------------------------------------------------------------------

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas varius

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println wordWrap(text)

println wordWrap(text, 120)</lang>

Output:

<pre>In olden times when wishing still helped one, there lived a king whose daughters

were all beautiful, but the youngest was so beautiful that the sun itself, which

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</lang>

Output:

<pre>

DEFAULT:

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print(textwrap(example1, 60))</lang>

'''Output:'''

<pre>Even today, with proportional fonts and complex layouts, there are still

cases where you need to wrap text at a specified column. The basic task is

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StringJoin@@Riffle[masterString,"\n"]

];</lang>

~~Output~~ for width 72 and 80:

{{out}} for width 72 and 80:

<lang>wordWrap[72, 1, string]

wordWrap[80, 1, string]</lang>

Output:

<pre>In olden times when wishing still helped one, there lived a king

whose daughters were all beautiful, but the youngest was so beautiful

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echo wordWrap(txt, 45)

</lang>

Output:

<pre>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec a diam lectus.

Sed sit amet ipsum mauris. Maecenas congue ligula ac quam viverra nec

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wrap(King, 50)</lang>

Output:

<pre>

And so let freedom ring from the prodigious hilltops of New Hampshire; let

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Say time('E')

</pre>

Output:

<pre>

A nnnnnnnnnnnnnn ooooooooooooooo nnnnnnnnnnnnnn

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if $\=='' then say $ /*handle any residual words. */

/*stick a fork in it, we're done.*/</lang>

~~'''output'''~~ is the same as version 1 using the   '''L'''eft   option (the default).

{{out}} is the same as version 1 using the   '''L'''eft   option (the default).

===version 1===

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∙ Parameters are variables travelling under an assumed name.

</pre>

~~'''output'''~~ when specifying:   <tt> , 155 </tt>

{{out}} when specifying:   <tt> , 155 </tt>

────────── Computer programming laws ────────── The Primal Scenario -or- Basic Datum of Experience: ∙ Systems in general work poorly or not at all. ∙

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assumed name.

</pre>

~~Output~~ when specifying: <tt> , 77 </tt>

{{out}} when specifying: <tt> , 77 </tt>

────────── Computer programming laws ────────── The Primal Scenario -or-

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name.

</pre>

~~Output~~ [justified] when specifying: <tt> , 70 both </tt>

{{out}} [justified] when specifying: <tt> , 70 both </tt>

────────── Computer programming laws ────────── The Primal Scenario -or-

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Return

o:Return lineout(oid,arg(1))</lang>

~~Output~~ for widths 72 and 9

{{out}} for widths 72 and 9

<pre>

123456789.123456789.123456789.123456789.123456789.123456789.123456789.12

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FILE "text" = wrappedtext

</lang>

Output:

--------------------------------------------------------------------------------