Paul Van Delst
10/20/2006 4:00:00 PM
Hello,
I'm using ruby to automatically generate Fortran95 code and I'm using a regular expression
to parse the following type of definition line:
REAL(fp), DIMENSION(Dim1,Dim2) :: Arr2 ! Description of Arr2
The regexp I'm using works fine and I build a array of hashes for each definition, i.e.
if line =~ componentRegexp
# We have matched an array component definition
arrayList<<{"type"=>$1,
"param"=>$2,
"dimlist"=>$3,
"name"=>$4,
"description"=>$5}
puts(arrayList.last.inspect)
else
# No match, so raise an error
raise StandardError, "Invalid array definition, #{$~}"
end
which works fine. The inspect o/p gives me:
{"name"=>"Arr2", "type"=>"REAL", "description"=>"Description of Arr2", "param"=>"fp",
"dimlist"=>"Dim1,Dim2"}
However, what I want to do is modify the dimlist in the hash so it is a string array
"dimlist"=>["Dim1","Dim2"]
rather than a single string,
"dimlist"=>"Dim1,Dim2"
Because the number of dimensions in the dimlist can vary from 1 to 7, rather than do the
splitting in the regexp, I tried doing it in the arrayList concatenation using the split
method like so,
arrayList<<{"type"=>$1,
"param"=>$2,
"dimlist"=>$3.split(/\s*,\s*/), # <--- split dimlist on ","
"name"=>$4,
"description"=>$5}
but I've found that the above operation on the $3 captured result appears to "wipe" the
subsequent entries $4 (name) and $5 (description). For example, the output of
puts(arrayList.last.inspect)
on the above gives me,
{"name"=>nil, "type"=>"REAL", "description"=>nil, "param"=>"fp", "dimlist"=>["Dim1", "Dim2"]}
Note that the "dimlist" is how I want it, but "name" and "description" entries are now nil.
So can someone elaborate on why the above split operation on captured regexp results seems
to bugger up the other captured results? Does this issue extend to *any* operation on
captured regexp results?
I've looked through the pickaxe and cookbook, but no information on this was immediately
apparent.
Thanks for any info.
cheers,
paulv
--
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