Files
Mango/src/util/numeric_sort.cr
2021-03-12 15:03:12 +00:00

43 lines
968 B
Crystal

# Properly sort alphanumeric strings
# Used to sort the images files inside the archives
# https://github.com/hkalexling/Mango/issues/12
require "big"
def is_numeric(str)
/^\d+/.match(str) != nil
end
def split_by_alphanumeric(str)
arr = [] of String
str.scan(/([^\d\n\r]*)(\d*)([^\d\n\r]*)/) do |match|
arr += match.captures.select &.!= ""
end
arr
end
def compare_numerically(c, d)
is_c_bigger = c.size <=> d.size
if c.size > d.size
d += [nil] * (c.size - d.size)
elsif c.size < d.size
c += [nil] * (d.size - c.size)
end
c.zip(d) do |a, b|
return -1 if a.nil?
return 1 if b.nil?
if is_numeric(a) && is_numeric(b)
compare = a.to_big_i <=> b.to_big_i
return compare if compare != 0
else
compare = a <=> b
return compare if compare != 0
end
end
is_c_bigger
end
def compare_numerically(a : String, b : String)
compare_numerically split_by_alphanumeric(a), split_by_alphanumeric(b)
end