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#SRC: JCON
procedure main()
local i, s, x
ws() # dump initial state
write()
every setsubj(s := "cat" | "" | "donut" | "x") do
every i := -*s-2 to *s+3 do
setpos(i)
write()
"outer" ? {
ws()
&pos := 3
ws()
"inner" ? {
ws()
&pos := 2
ws()
}
ws()
}
"123456" ? {
&pos := 3
x := 4
write("&pos=", &pos, " x=", x)
&pos :=: x
write("&pos=", &pos, " x=", x)
&pos := 3
x := 9
&pos :=: x
write("&pos=", &pos, " x=", x)
&pos := 3
x := 9
x :=: &pos
write("&pos=", &pos, " x=", x)
&pos := 3
x := 9
every &pos <-> x do write("&pos=", &pos, " x=", x)
write("&pos=", &pos, " x=", x)
&pos := 3
x := 9
every x <-> &pos do write("&pos=", &pos, " x=", x)
write("&pos=", &pos, " x=", x)
&pos := 3
x := 2
every &pos <-> x do &subject := "A"
write("&pos=", &pos, " x=", x)
&pos := 3
x := 2
every x <-> &pos do &subject := "A"
write("&pos=", &pos, " x=", x)
}
end
procedure setpos(n)
writes("p := ", right(image(n),10))
if &pos := n then
writes(" ")
else
writes(" FAILED")
ws()
return
end
procedure setsubj(s)
writes("s := ", right(image(s),10))
if &subject := s then
writes(" ")
else
writes(" FAILED")
ws()
return
end
procedure ws() # write state of &setpos and &subject
write(" &pos=", image(&pos), " &subject=", image(&subject))
return
end
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