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#!/usr/bin/env ruby
def mkswapbitpairs(i,j)
if i <= j
STDERR.puts "assertion i=#{i}>#{j}=j failed"
exit 1
end
return "GT_SWAPBITPAIRS(kmer,#{2*i},#{2*j},#{2*(i-j)})"
end
def extractpair(i)
return "(kmer & (3U << #{2*i}))"
end
def mkswapbits(len)
i=len-1
j=0
explist=[]
loop do
if i < j
break
end
if i == j
explist.push(extractpair(i))
break
end
explist.push(mkswapbitpairs(i,j))
i -= 1
j += 1
end
return explist.join(" |\n"+" "*13)
end
if ARGV.length != 0
STDERR.puts "Usage: #{$0}"
exit 1
end
puts "#include <stdio.h>"
puts "#include \"assert_api.h\""
puts "#define GT_SWAPBITPAIRS(KMER,L1,L2,D) (((KMER) & (3UL << L1)) >> D) |\\"
puts " (((KMER) & (3UL << L2)) << D)"
puts "static GtCodetype gt_kmercode_reverse(GtCodetype kmer,unsigned int kmersize)"
puts "{"
puts " switch (kmersize)"
puts " {"
2.upto(32) do |len|
if len == 16
puts "#ifdef _LP64"
end
puts " case #{len}:"
puts " return #{mkswapbits(len)};"
end
puts "#endif"
puts " default: fprintf(stderr,\"illegal kmersize=%u\\n\",kmersize);"
puts " exit(GT_EXIT_PROGRAMMING_ERROR);"
puts " }"
puts "}"
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