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############################################################################
#
# File: kwic.icn
#
# Subject: Program to produce keywords in context
#
# Author: Stephen B. Wampler, modified by Ralph E. Griswold
#
# Date: February 15, 1995
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This is a simple keyword-in-context (KWIC) program. It reads from
# standard input and writes to standard output. The "key" words are
# aligned in column 40, with the text shifted as necessary. Text shifted
# left is truncated at the left. Tabs and other characters whose "print width"
# is less than one may not be handled properly.
#
# If an integer is given on the command line, it overrides the default
# 40.
#
# Some noise words are omitted (see "exceptions" in the program text).
# If a file named except.wrd is open and readable in the current directory,
# the words in it are used instead.
#
# This program is pretty simple. Possible extensions include ways
# of specifying words to be omitted, more flexible output formatting, and
# so on. Another "embellisher's delight".
#
############################################################################
global line, loc, exceptions, width
procedure main(args)
local exceptfile
width := integer(args[1]) | 40
if exceptfile := open("except.wrd") then {
exceptions := set()
every insert(exceptions, lcword(exceptfile))
close(exceptfile)
}
else
exceptions := set(["or", "in", "the", "to", "of", "on", "a",
"an", "at", "and", "i", "it", "by", "for"])
every write(kwic(&input))
end
procedure kwic(file)
local index, word
# Each word, in lowercase form, is a key in the table "index".
# The corresponding values are lists of the positioned lines
# for that word. This method may use an impractically large
# amount of space for large input files.
index := table()
every word := lcword(file) do {
if not member(exceptions,word) then {
/index[word] := []
index[word] := put(index[word],position())
}
}
# Before the new sort options, it was done this way -- the code preserved
# as an example of "generators in action".
# suspend !((!sort(index,1))[2])
index := sort(index,3)
while get(index) do
suspend !get(index)
end
procedure lcword(file)
static chars
initial chars := &ucase ++ &lcase ++ &digits ++ '\''
every line := !file do
line ? while tab(loc := upto(chars)) do
suspend map(tab(many(chars)) \ 1)
end
procedure position()
local offset
# Note that "line" and ""loc" are global.
offset := width - loc
if offset >= 0 then return repl(" ",offset) || line
else return line[-offset + 1:0]
end
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