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#!/usr/bin/env lua
local t1 = {}
do
local lpeg = require'lpeg'
local P = lpeg.P
function t1.make_pat(s)
return P(s)
end
end
function t1.common_base_string(s1, s2)
-- ensure s1 is smaller or equal in length to s2
if s1:len() > s2:len() then
s1, s2 = s2, s1
end
local s2_len = s2:len()
local results, substring, part = {}
for i = 1,s2_len do
-- skip attempt if s2's length not evenly divisible by i
if s2_len % i ~= 0 then goto continue end
substring = s2:sub(1, s2_len // i)
part = t1.make_pat(substring)
if (part^i):match(s2) and (part^1 * -1):match(s1) then
table.insert(results, substring)
end
::continue::
end
return results
end
function t1.run(args)
local S1, S2 = table.unpack(args, 1, 2)
local bases = t1.common_base_string(S1, S2)
print(table.concat(bases, " "))
end
return t1
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