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############################################################################
#
# File: patword.icn
#
# Subject: Procedures to find letter patterns
#
# Author: Kenneth Walker
#
# Date: December 2, 1995
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# The procedure patword(s) returns a letter pattern in which each
# different character in s is assigned a letter. For example,
# patword("structural") returns "abcdebdcfg".
#
############################################################################
procedure patword(s)
local numbering, orderS, orderset, patlbls
static labels, revnum
initial {
labels := &lcase || &lcase
revnum := reverse(&cset)
}
# First map each character of s into another character, such that the
# the new characters are in increasing order left to right (note that
# the map function chooses the rightmost character of its second
# argument, so things must be reversed.
#
# Next map each of these new characters into contiguous letters.
numbering := revnum[1 : *s + 1] | stop("word too long")
orderS := map(s, reverse(s), numbering)
orderset := string(cset(orderS))
patlbls := labels[1 : *orderset + 1] | stop("too many characters")
return map(orderS, orderset, patlbls)
end
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