From: Louis-Philippe <default@...>
Date: 2009-06-05T02:14:17+09:00
Subject: Re: block as string

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Thanks guys,
while I think RubyMacro is a great idea (!!!),
I will wait until it get a bit more maturity and speed before using it.

I'll probably stick one of your trick onto a block Brian, something like:

-----------------------------
$var = "global var"

def parsed_execution(list)
cmd_array = list.split("\n").map { |i| i.chomp.lstrip.rstrip }
# process cmd_array here
cmd_array.each_with_index do |o,i|
puts "cmd #{i}:"
$var = "Finished!!" if i == cmd_array.size-1
eval o
end
end

parsed_execution <<-BLOCK
puts "Line 1"
puts $var
puts "replacing global var..."
$var = "new global var"  # will never get printed!!!
puts $var
BLOCK
---------------------------------

I choosed the <<-EOF string because it is less likely to introduce conflict
with the inner syntax... though %Q with a rightly choosed symbol might also
be interesting.
what would be even neater would be to alias the <<- or %Q as something
smaller or more intuitive for my DSL, but I believe this is impossible...

Thanks!

L-P




2009/6/3 Caleb Clausen <vikkous@gmail.com>

> On 6/3/09, Louis-Philippe <default@spiralix.org> wrote:
> > what I need is some sort of macro system (the LISP macro, not the C one),
> > to parse the block before calling it.  I was thinking to make it a
> string,
> > then parsing with regex, would have done it... but seems not.  I'll work
> out
> > an other logic around the problem then ;).
>
> RubyMacros is an implementation of lisp-like macros for ruby....
> however, unlike ParseTree, it doesn't allow you to get at the contents
> of a block. It does however, provide lisp-like forms as well. Maybe
> you can put whatever code you need into a form? Take a look here:
>
> http://github.com/coatl/rubymacros
>
>

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