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############################################################################
#
# File: c2icn.icn
#
# Subject: Program to assist C-to-Icon porting
#
# Author: Robert J. Alexander
#
# Date: March 11, 1993
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Filter to do some of the mundane work involved in porting a C
# program to Icon.
#
# - Reformats comments, moving embedded comments to end of line
# - Removes the ";" from ends of lines
# - Reformats line-continued strings
# - Changes = to :=
# - Changes -> to .
#
############################################################################
procedure main(arg)
local c, comment, line, tline
while line := trim(read(),' \t') do line ? {
line := comment := ""
while line ||:= tab(upto('\'"/=-')) do {
case c := move(1) of {
"\"" | "'": {
line ||:= c
repeat {
until line ||:= tab(find(c) + 1) do {
line ||:= tab(0)
if line[-1] == "\\" then line[-1] := "_"
else stop("unbalanced quotes")
Out(line)
line := ""
&subject := read()
}
if not (line[-2] == "\\" & not (line[-3] == "\\")) then break
}
}
"/": {
if ="*" then {
until comment ||:= trim(tab(find("*/")),' \t') do {
comment ||:= trim(tab(0),' \t')
Out(line,comment)
line := comment := ""
&subject := trim(read(),' \t')
}
move(2)
}
}
"=": {
if ="=" then line ||:= "=="
else if any('<>!',line[-1]) then line ||:= c
else line ||:= ":="
}
"-": {
if =">" then line ||:= "."
else line ||:= c
}
default: line ||:= c
}
}
line ||:= tab(0)
tline := trim(line)
if tline[-1] == ";" then {
line := tline[1:-1] || line[*tline + 1:0]
}
Out(line,comment)
}
end
procedure Out(line,comment)
line ||:= "#" || ("" ~== \comment)
line := trim(line,' \t')
write(line)
return
end
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