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