Matt Maycock
10/15/2004 2:37:00 PM
--- code ---
#!/home/ummaycoc/bin/ruby -w
# Number stuff down the side
# REM means remark (NO number)
# No number means continue last number
# \ is same as no number...
# -d debug mode.
class NRuby
def initialize(debug = false)
@line = 0
@next = nil
@debug = debug
end
def goto(line)
@next = line
end
def stop()
@next = nil
end
def NRuby.error(msg)
$stderr.puts("NRubyErr: #{msg}")
exit(-1)
end
def debug(code, line)
if @debug then
puts "NO CODE #{line}" unless code[line]
puts "**#{line}**\n#{code[line]}\n" if code[line]
end
end
def NRuby.read(input, start)
code, prev = Hash.new(false), start
input.each {|line|
doPrev = false
case line
when /^\s*REM(\s+|(\s*$))/i then ;
when /^\s*$/ then ;
when /^\s*(\d+)\s+(.*)$/ then prev = $1.to_i
code[prev] = [$2]
when /^\s*\\\s+(.*)$/ then doPrev, line = true, $1
else doPrev = true
end
error "No Previous Line!" if prev.nil? && doPrev
code[prev] = [] unless code.include? prev
code[prev] << line if doPrev
}
code.each_key {|key|
code[key] = code[key].join(" \n")
}
code
end
def execute(code)
lastline = code.keys.max
until @line.nil? || @line > lastline
debug(code, @line)
@next = nil
eval(code[@line]) if code[@line]
@line = @next || @line + 1
end
end
end
debug = false
if ARGV.length > 0 then
if ARGV.include? "-d" then
debug = true
ARGV.delete "-d"
end
end
@___nruby___, start = NRuby.new(debug), nil
if ARGV.length > 0 then
stdin_read, lines = false, nil
until ARGV.empty? do
arg = ARGV.shift
case arg
when /^-+h/i
$stderr.puts <<-END_HELP
#{File.basename($0)} [-z|-s num] [-d] [files+]
-z sets the first number label to zero - for unlabeled code at
beginning of program.
-s num sets the first number label to num. Same use as -z.
-d debug mode.
files list what files to read from. - is stdin.
If no inputs are given, a program is read from stdin and executed.
END_HELP
exit(-1)
when '-'
NRuby.error "Already read from stdin." if stdin_read
stdin_read = true
lines = $stdin.readlines
when '-z'
start = 0
when '-s'
NRuby.error "No argument given with -s." if ARGV.empty?
start = ARGV.shift
NRuby.error "Argument to -s must be integer." unless start =~ /-?\d+$/
start = start.to_i
else
NRuby.error "#{arg} doesn't exist..." unless FileTest.exists?(arg)
NRuby.error "#{arg} isn't a file..." unless FileTest.file?(arg)
NRuby.error "#{arg} isn't readable..." unless FileTest.readable?(arg)
lines = File.readlines(arg)
end
lines ||= $stdin.readlines
lines.each {|l| l.chomp!}
@___nruby___.execute(NRuby.read(lines, start))
end
else
lines = $stdin.readlines.map {|l| l.chomp}
if lines.nil? || lines.empty? then
NRuby.error "No input given."
else
@___nruby___.execute(NRuby.read(lines, start))
end
end
--- a usage ---
[ummaycoc@queen ummaycoc]$ echo '
10 x = 1
11 x += 1
12 puts x
15 goto 18 if x == 10
16 goto 11
18 puts "done"
stop' | nruby
2
3
4
5
6
7
8
9
10
done
[ummaycoc@queen ummaycoc]$
--- usage 2 & 3 ---
[ummaycoc@queen bin]$ echo 'puts "hi"' | nruby
NRubyErr: No Previous Line!
[ummaycoc@queen bin]$ echo 'puts "hi"' | nruby -z
hi
[ummaycoc@queen bin]$
-------------------------------
--
There's no word in the English language for what you do to a dead
thing to make it stop chasing you.