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Ruby vs Python for Code Generation and Flippin' Templates

16 replies on 2 pages. Most recent reply: Feb 19, 2008 12:51 PM by mike bayer

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James Watson

Posts: 2024
Nickname: watson
Registered: Sep, 2005

Re: Ruby vs Python for Code Generation and Flippin' Templates Posted: Feb 16, 2008 9:30 PM
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> When it comes to storing structured data, the reason I
> recommend XML (or any other format with named closing
> structures) is that complex data often lacks the
> redundancy in content that clues us to indentation levels
> being incorrect and thus nesting being wrong. If you have
> nested levels of items with arbitrary property lists, how
> do you tell if a given key-value pair belongs to a parent
> structure other than solely by the indent level?

In the case of my own custom structure, I restrict the indents to 4 spaces only. My understanding was that the issue is the mixed whitespace as you mention in your post.

Based on what you are suggesting and my own thought about this I am wondering if I should add an attribute ending character and one for the start of an element.

The reason I wished to avoid this in the first place is that now I have no need for escaping. Obviously, if I want to support attributes with newlines, I'd need to change that anyway. Escaping isn't a big deal really, I've added it to parsers before.

mike bayer

Posts: 22
Nickname: zzzeek
Registered: Jan, 2005

Re: Ruby vs Python for Code Generation and Flippin' Templates Posted: Feb 19, 2008 12:51 PM
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> Thanks for the pointer to Genshi and I particularly
> appreciated its plain text mode:

> Dear $name,
>
> These are some of my favorite fruits:
> #for fruit in fruits
> * $fruit
> #end
>


if you appreciated Genshi's plain text mode (as opposed to its XML mode which is its bread and butter) then you should consider Mako:


Dear ${name},

These are some of my favorite fruits:
% for fruit in fruits:
* ${fruit}
% endfor


note that we are doing real python for the "for" statement, including the colon.

if the {} are killing you, I would note the purpose of them is so that you can say:

thisisa${somestring}with${dynamic}sections${embedded}

i.e. {} is a better delimiter than non-alphanumeric character detection (explicit as opposed to implicit).

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