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> > The DSL should be simple (similar to Tcl/Tk code):
> >     button foo -text "Foo" -x 10 -y 20
> >     label ...
> > 
> > So, I though about using Lex & Yacc in C to parse the DSL
> 
> Try my lcl: http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/#lcl

More especifically, cl.eval turns 
	button foo -text "Foo" -x 10 -y 20
into
	button("foo","-text","Foo",-"x",10,"-y",20)
(internally, not textually) and executes it.

If you only want to parse that line, you can use cl.unpack.