# Wrappers around interaction primitives that take a potentially fake object
# and are thus easier to test.
exclusive-container event [
text:character
keycode:number # keys on keyboard without a unicode representation
touch:touch-event # mouse, track ball, etc.
resize:resize-event
# update the assume-console handler if you add more variants
]
container touch-event [
type:number
row:number
column:number
]
container resize-event [
width:number
height:number
]
container console [
index:number
data:address:array:event
]
recipe new-fake-console [
local-scope
result:address:console <- new console:type
buf:address:address:array:character <- get-address *result, data:offset
*buf <- next-ingredient
idx:address:number <- get-address *result, index:offset
*idx <- copy 0
reply result
]
recipe read-event [
local-scope
x:address:console <- next-ingredient
{
break-unless x
idx:address:number <- get-address *x, index:offset
buf:address:array:event <- get *x, data:offset
{
max:number <- length *buf
done?:boolean <- greater-or-equal *idx, max
break-unless done?
dummy:address:event <- new event:type
reply *dummy, x/same-as-ingredient:0, 1/found, 1/quit
}
result:event <- index *buf, *idx
*idx <- add *idx, 1
reply result, x/same-as-ingredient:0, 1/found, 0/quit
}
# real event source is infrequent; avoid polling it too much
switch
result:event, found?:boolean <- check-for-interaction
reply result, x/same-as-ingredient:0, found?, 0/quit
]
# variant of read-event for just keyboard events. Discards everything that
# isn't unicode, so no arrow keys, page-up/page-down, etc. But you still get
# newlines, tabs, ctrl-d..
recipe read-key [
local-scope
console:address <- next-ingredient
x:event, console, found?:boolean, quit?:boolean <- read-event console
reply-if quit?, 0, console/same-as-ingredient:0, found?, quit?
reply-unless found?, 0, console/same-as-ingredient:0, found?, quit?
c:address:character <- maybe-convert x, text:variant
reply-unless c, 0, console/same-as-ingredient:0, 0/found, 0/quit
reply *c, console/same-as-ingredient:0, 1/found, 0/quit
]
recipe send-keys-to-channel [
local-scope
console:address <- next-ingredient
chan:address:channel <- next-ingredient
screen:address <- next-ingredient
{
c:character, console, found?:boolean, quit?:boolean <- read-key console
loop-unless found?
break-if quit?
assert c, [invalid event, expected text]
screen <- print-character screen, c
chan <- write chan, c
loop
}
reply console/same-as-ingredient:0, chan/same-as-ingredient:1, screen/same-as-ingredient:2
]
recipe wait-for-event [
local-scope
console:address <- next-ingredient
{
_, console, found?:boolean <- read-event console
loop-unless found?
}
reply console/same-as-ingredient:0
]
# use this helper to skip rendering if there's lots of other events queued up
recipe has-more-events? [
local-scope
console:address <- next-ingredient
{
break-unless console
# fake consoles should be plenty fast; never skip
reply 0/false
}
result:boolean <- interactions-left?
reply result
]