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############################################################################
#
# File: interpp.icn
#
# Subject: Program to interpret Icon programs
#
# Author: Jerry Nowlin
#
# Date: December 30, 1991
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program is kind of like an interactive version of BASIC in that Icon
# expressions are entered with line numbers and you can resequence them list
# them etc. and execute all the lines entered. There is no editor built
# in. You have to retype a line to change it.
#
# Documentation is lacking but there is a "?" help command that lists all
# the other commands.
#
############################################################################
#
# See also: interpe.icn
#
############################################################################
global WHITE, # the white space cset
MFLAG, # the modified flag
PRTBL # the program table
procedure main(arg)
local line, lno, pline
# define the needed cset
WHITE := ' \t\n\f'
# initialize the program table
PRTBL := table()
# initialize the modified flag
MFLAG := 0
# get all the input
writes("Icon> ")
while line := read() do {
# scan the input line
line ? {
# skip any initial white space
tab(many(WHITE))
# check for program lines (they have line numbers)
if lno := tab(many(&digits)) & tab(many(WHITE)) then {
# get the program line
pline := tab(0)
# store the line in the program table
PRTBL[numeric(lno)] := pline
# set the modified flag
MFLAG +:= 1
}
# read command
else if (tab(upto(WHITE)) | tab(0)) ==
("read" | "r") then {
readprog()
# clear the modified flag
MFLAG := 0
}
# write command
else if (tab(upto(WHITE)) | tab(0)) ==
("write" | "w") then {
writeprog()
# clear the modified flag
MFLAG := 0
}
# delete command
else if (tab(upto(WHITE)) | tab(0)) ==
("delete" | "d") then {
delprog()
# set the modified flag
MFLAG +:= 1
}
# sequence command
else if (tab(upto(WHITE)) | tab(0)) ==
("sequence" | "s") then {
seqprog()
}
# list command
else if (tab(upto(WHITE)) | tab(0)) ==
("list" | "l") then {
listprog()
}
# execute command
else if (tab(upto(WHITE)) | tab(0)) ==
("execute" | "e") then {
execprog()
}
# help command
else if (tab(upto(WHITE)) | tab(0)) ==
("help" | "h" | "?") then {
helpprog()
}
# quit command
else if (tab(upto(WHITE)) | tab(0)) ==
("quit" | "q") then {
quitprog()
}
# invalid syntax input
else {
write("Syntax Error: ",line)
helpprog()
}
}
writes("Icon> ")
}
end
procedure execprog()
local runargs, out, prog, line, command
static tmpfile
initial tmpfile := "TMPFILE.icn"
# get any runtime arguments
runargs := tab(0)
# create the temporary Icon file
(out := open(tmpfile,"w")) |
# or mention the problem and fail
(write("I can't open '",tmpfile,"' for writing") & fail)
# sort the program table
prog := sort(PRTBL)
# put the program in the file
every line := !prog do {
write(out,line[2])
}
close(out)
# format the command to execute the program
command := "icont -s " || tmpfile || " -x " || runargs
# add the command to remove the temporary file
command ||:= " ; rm -f " || tmpfile
# execute the command
system(command)
end
procedure seqprog()
local begno, incno, prog, lno, l
# initialize the sequencing numbers
begno := incno := 10
# skip any white space
tab(many(WHITE))
# get an initial line number
begno := numeric(tab(many(&digits)))
# skip any white space
tab(many(WHITE))
# get a increment number
incno := numeric(tab(many(&digits)))
# sort the program table
prog := sort(PRTBL)
# reinitialize it
PRTBL := table()
# sequence the program lines starting with begno by incno
lno := begno
every l := !prog do {
PRTBL[lno] := l[2]
lno +:= incno
}
end
procedure readprog()
local readfile, response, in, lno, line
# get a possible command line file name
tab(many(WHITE))
readfile := tab(upto(WHITE) | 0)
# if there was no file with the command get one
if /readfile | *readfile = 0 then {
writes("Read file name: ")
readfile := read()
}
# make sure a modified file has been written
if MFLAG > 0 then {
writes("Write before reading over current program? ")
response := read()
if any('yY',response) then
writeprog()
}
# initialize the program table
PRTBL := table()
# read the program from the read file
in := open(readfile,"r")
lno := 10
every line := !in do {
PRTBL[lno] := line
lno +:= 10
}
close(in)
# tell them what you did
write("Read '",readfile,"'...",*PRTBL," lines")
end
procedure writeprog()
local writefile, prog, out, l
# get a possible command line file name
tab(many(WHITE))
writefile := tab(upto(WHITE) | 0)
# if there was no file with the command get one
if /writefile | *writefile = 0 then {
writes("Write file name: ")
writefile := read()
}
# sort the program table
prog := sort(PRTBL)
# write the program to the write file
out := open(writefile,"w")
every l := !prog do {
write(out,l[2])
}
close(out)
# tell them what you did
write("Write '",writefile,"'...",*PRTBL," lines")
end
procedure delprog()
local begno, endno, prog, l, lno
# initialize the line numbers
begno := 0
endno := 99999
# skip any white space
tab(many(WHITE))
# get an initial line number
begno := endno := numeric(tab(many(&digits)))
# skip any white space
tab(many(WHITE))
# get a final line number
endno := numeric(tab(many(&digits)))
# sort the program table
prog := sort(PRTBL)
# reinitialize it
PRTBL := table()
# delete the program lines between the optional numbers
every l := !prog do {
lno := numeric(l[1])
if (lno < begno) | (lno > endno) then PRTBL[lno] := l[2]
}
end
procedure listprog()
local begno, endno, prog, l, lno
# initialize the line numbers
begno := 0
endno := 99999
# skip any white space
tab(many(WHITE))
# get an initial line number
begno := endno := numeric(tab(many(&digits)))
# skip any white space
tab(many(WHITE))
# get a final line number
endno := numeric(tab(many(&digits)))
# sort the program table
prog := sort(PRTBL)
# list the program lines between the optional numbers
every l := !prog do {
lno := numeric(l[1])
if (lno >= begno) & (lno <= endno) then
write(right(lno,5),": ",l[2])
if lno > endno then break
}
end
procedure helpprog()
static helpmsg
# define the help message
initial {
helpmsg := [
"<<< Icon Expression Syntax >>>",
"",
"lineno expression",
"",
"<<< Command Summary >>>",
" (1st character works)",
"",
"read [ file ]",
"write [ file ]",
"list [ begno [ endno ] ]",
"delete [ begno [ endno ] ]",
"sequence [ begno [ increment ] ]",
"execute [ args ]",
"quit",
"help"
]
}
# print it
every write(!helpmsg)
end
procedure quitprog()
local response
# make sure a modified file has been written
if MFLAG > 0 then {
writes("Write before quitting? ")
response := read()
if any('yY',response) then
writeprog()
}
stop("Goodbye.")
end
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