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What is the best way to generate HTML from an array of arrays

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Andy Burnett

What is the best way to generate HTML from an array of arrays

I want to display a threaded discussion. The threads will probably be stored in an array, and n levels of comments would be in nested arrays, e.g.:

model := #('one' 'two' ('two a' 'two b') 'three').

I want to generated

OL
   LI one /LI
   LI two /LI
   OL
       LI two a /LI
...
/OL

If there were no embedded arrays I would just do something like:

model do: [:each| html listItem: (each asString)]

But as soon as I have embedded arrays, my mind goes a bit blank and I start thinking about recursive routines, and that doesn't seem very Smalltalk at all! So, what is the OO way to do this?

Thanks
Andy

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Randal L. Schwartz

Re: What is the best way to generate HTML from an array of arrays

>>>>> "Andy" == Andy Burnett <[hidden email]> writes:

Andy> If there were no embedded arrays I would just do something like:

Andy> model do: [:each| html listItem: (each asString)]

Andy> But as soon as I have embedded arrays, my mind goes a bit blank and I start
Andy> thinking about recursive routines, and that doesn't seem very Smalltalk at
Andy> all! So, what is the OO way to do this?

Create a visitor pattern. Teach each of strings and arrays how to
present themselves.

--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<[hidden email]> <URL:http://www.stonehenge.com/merlyn/>
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Ramon Leon-5

RE: What is the best way to generate HTML from an array ofarrays

In reply to this post by Andy Burnett

> Subject: [Newbies] What is the best way to generate HTML from
> an array ofarrays
>
> I want to display a threaded discussion. The threads will
> probably be stored in an array, and n levels of comments
> would be in nested arrays, e.g.:
>
> model := #('one' 'two' ('two a' 'two b') 'three').
>
> I want to generated
>
> OL
> LI one /LI
> LI two /LI
> OL
> LI two a /LI
> ...
> /OL
>
>
> If there were no embedded arrays I would just do something like:
>
> model do: [:each| html listItem: (each asString)]
>
> But as soon as I have embedded arrays, my mind goes a bit
> blank and I start thinking about recursive routines, and that
> doesn't seem very Smalltalk at all! So, what is the OO way
> to do this?
>
> Thanks
> Andy

Doesn't seem very OO to me, nested arrays sounds kind of ugly. What's wrong
with a #Comment having a collection of #Comments, and rendering them
recursively? Why do you think recursion isn't Smalltalk'ish? What's wrong
with (simplified example)...

renderPost: aPost on: html
html render: aPost.
aPost comments do:
[ :each | self renderComment: each on: html ]

renderComment: aComment on: html
html html: aComment body.
aComment comments do:
[ :each | self renderComment: each on: html ]

Ramon Leon
http://onsmalltalk.com

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