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############################################################################
#
# Name: concord.icn
#
# Title: Produce concordance
#
# Author: Ralph E. Griswold
#
# Date: December 22, 1989
#
############################################################################
#
# This program produces a simple concordance from standard input to standard
# output. Words less than three characters long are ignored.
#
# There are two options:
#
# -l n set maximum line length to n (default 72), starts new line
# -w n set maximum width for word to n (default 15), truncates
#
# There are lots of possibilities for improving this program and adding
# functionality to it. For example, a list of words to be ignored could be
# provided. The formatting could be made more flexible, and so on.
#
############################################################################
#
# Note that the program is organized to make it easy (via item()) to
# handle other kinds of tabulations.
#
############################################################################
#
# Links: options, post
#
############################################################################
link options, post
global uses, colmax, namewidth, lineno
procedure main(args)
local opts, uselist, name, line
Init__("concord")
opts := options(args, "l+w+") # process options
colmax := \opts["l"] | 72
namewidth := \opts["w"] | 15
uses := table("")
lineno := 0
every tabulate(item(), lineno) # tabulate all the citations
uselist := sort(uses, 3) # sort by uses
while name := get(uselist) do
format(left(name, namewidth) || get(uselist))
Term__()
end
# Add line number to citations for name. If it already has been cited,
# add (or increment) the number of citations.
#
procedure tabulate(name, lineno)
local new, count, number
lineno := string(lineno)
new := ""
uses[name] ? {
while new ||:= tab(upto(&digits)) do {
number := tab(many(&digits))
new ||:= number
}
if /number | (number ~== lineno)
then uses[name] ||:= lineno || ", " # new line number
else {
if ="(" then count := tab(upto(')')) else count := 1
uses[name] := new || "(" || count + 1 || "), "
}
}
end
# Format the output, breaking long lines as necessary.
#
procedure format(line)
local i
while *line > colmax + 2 do {
i := colmax + 2
until line[i -:= 1] == " " # back off to break point
write(line[1:i])
line := repl(" ", namewidth) || line[i + 1:0]
}
write(line[1:-2])
end
# Get an item. Different kinds of concordances can be obtained by
# modifying this procedure.
#
procedure item()
local i, word, line
while line := read() do {
lineno +:= 1
write(right(lineno, 6), " ", line)
line := map(line) # fold to lowercase
i := 1
line ? {
while tab(upto(&letters)) do {
word := tab(many(&letters))
if *word >= 3 then suspend word # skip short words
}
}
}
end
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