Decompose composed characters to the decomposed form.
# File activesupport/lib/active_support/multibyte/unicode.rb, line 145
def decompose_codepoints(type, codepoints)
codepoints.inject([]) do |decomposed, cp|
# if it's a hangul syllable starter character
if HANGUL_SBASE <= cp and cp < HANGUL_SLAST
sindex = cp - HANGUL_SBASE
ncp = [] # new codepoints
ncp << HANGUL_LBASE + sindex / HANGUL_NCOUNT
ncp << HANGUL_VBASE + (sindex % HANGUL_NCOUNT) / HANGUL_TCOUNT
tindex = sindex % HANGUL_TCOUNT
ncp << (HANGUL_TBASE + tindex) unless tindex == 0
decomposed.concat ncp
# if the codepoint is decomposable in with the current decomposition type
elsif (ncp = database.codepoints[cp].decomp_mapping) and (!database.codepoints[cp].decomp_type || type == :compatability)
decomposed.concat decompose_codepoints(type, ncp.dup)
else
decomposed << cp
end
end
end
