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############################################################################
#
# File: tablc.icn
#
# Subject: Program to tabulate characters in a file
#
# Author: Ralph E. Griswold
#
# Date: June 10, 1988
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program tabulates characters and lists each character and
# the number of times it occurs. Characters are written using
# Icon's escape conventions. Line termination characters and other
# control characters are included in the tabulation.
#
# Options: The following options are available:
#
# -a Write the summary in alphabetical order of the charac-
# ters. This is the default.
#
# -n Write the summary in numerical order of the counts.
#
# -u Write only the characters that occur just once.
#
############################################################################
#
# Links: options
#
############################################################################
link options
procedure main(args)
local ccount, unique, order, s, a, pair, rwidth, opts
unique := 0 # switch to list unique usage only
order := 3 # alphabetical ordering switch
opts := options(args,"anu")
if \opts["a"] then order := 3
if \opts["n"] then order := 4
if \opts["u"] then unique := 1
ccount := table(0) # table of characters
while ccount[reads()] +:= 1
a := sort(ccount,order)
if unique = 1 then {
while s := get(a) do
if get(a) = 1 then write(s)
}
else {
rwidth := 0
every rwidth <:= *!a
while s := get(a) do
write(left(image(s),10),right(get(a),rwidth))
}
end
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