Rosetta Code/Rank languages by popularity
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You are encouraged to solve this task according to the task description, using any language you may know.
Sort most popular programming languages based in number of members in Rosetta Code categories (from http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500)
Output:
1. 246 - Programming_Tasks 2. 203 - Python 3. 201 - Ada 4. 188 - OCaml 5. 171 - Perl 6. 169 - Java 7. 168 - Haskell 8. 157 - C 9. 141 - Forth 10. 140 - Ruby ...
Filtering wrong results is optional. You can check against http://www.rosettacode.org/wiki/Special:MostLinkedCategories
Perl
This program checks the name of each category against this page so that only actual languages appear in the ranking.
<lang perl>use LWP::Simple 'get';
my $langs_url = 'http://www.rosettacode.org/w/api.php?action=query&list=categorymembers&cmtitle=Category:Programming_Languages&cmlimit=500&format=json'; my $cats_url = 'http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500';
my %langs = map {/Category:(.+)/, 1}
get($langs_url) =~ /"title":"(.+?)"}/g;
get($cats_url) =~ m{
- (.+?)
}s;
my @pairs =
sort {$b->[1] <=> $a->[1]} grep {$langs{ $_->[0] }} map {[ m{>(\S.*?)</a> \((\d+) member} ]}
split '
Python
Works with: Python 2.6
<lang python>import urllib import re
def key1(x):
return int(x.split()[0])
a = urllib.urlopen("http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500")
entries = []
for line in a:
match = re.search('>([^<>]*)</a> \((\d+) members?\)', line) if match: entries.append(match.group(2) + ' - ' + match.group(1))
a.close()
for c, line in enumerate(sorted(entries, key=key1, reverse=True),start=1):
print "%3d. %s" % (c, line)</lang>
Ruby
<lang ruby>require 'open-uri'
entries = []
open("http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500") do |f|
for line in f match = line.match(%r{>([^<>]*)</a> \((\d+) members?\)}) entries << match[2] + ' - ' + match[1] if match end
end
entries.sort_by {|x| -x.to_i}.each_with_index do |line, c|
puts "%3d. %s" % [c+1, line]
end</lang>
UnixPipes
echo "GET http://www.rosettacode.org/w/index.php?title=Special:Categories&limit=500 HTTP/1.0\n\n" | nc www.rosettacode.org 80 | sed -n -e 's,<[^>]*>,,g' -e's,^\([^(]*\)(\([^)]*\) members*) *,\2 - \1,g' -e'/^[0-9]\+./p' | sort -rn