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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">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  result:address:console<span class="Special"> &lt;- </span>new console:type
  buf:address:address:array:character<span class="Special"> &lt;- </span>get-address result:address:console/deref, data:offset
<span class="CommentedCode">#?   $start-tracing #? 1</span>
  buf:address:address:array:character/deref<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
<span class="CommentedCode">#?   $stop-tracing #? 1</span>
  idx:address:number<span class="Special"> &lt;- </span>get-address result:address:console/deref, index:offset
  idx:address:number/deref<span class="Special"> &lt;- </span>copy <span class="Constant">0:literal</span>
  <span class="muControl">reply</span> result:address:console
]

<span class="muRecipe">recipe</span> read-event [
  <span class="Constant">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  x:address:console<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> x:address:console
    idx:address:number<span class="Special"> &lt;- </span>get-address x:address:console/deref, index:offset
    buf:address:array:event<span class="Special"> &lt;- </span>get x:address:console/deref, data:offset
    <span class="Delimiter">{</span>
      max:number<span class="Special"> &lt;- </span>length buf:address:array:event/deref
      done?:boolean<span class="Special"> &lt;- </span>greater-or-equal idx:address:number/deref, max:number
      <span class="muControl">break-unless</span> done?:boolean
      dummy:address:event<span class="Special"> &lt;- </span>new event:type
      <span class="muControl">reply</span> dummy:address:event/deref, x:address:console/same-as-ingredient:0, <span class="Constant">1:literal/found</span>, <span class="Constant">1:literal/quit</span>
    <span class="Delimiter">}</span>
    result:event<span class="Special"> &lt;- </span>index buf:address:array:event/deref, idx:address:number/deref
    idx:address:number/deref<span class="Special"> &lt;- </span>add idx:address:number/deref, <span class="Constant">1:literal</span>
    <span class="muControl">reply</span> result:event, x:address:console/same-as-ingredient:0, <span class="Constant">1:literal/found</span>, <span class="Constant">0:literal/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"> &lt;- </span>check-for-interaction
  <span class="muControl">reply</span> result:event, x:address:console/same-as-ingredient:0, found?:boolean, <span class="Constant">0:literal/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">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
<span class="CommentedCode">#?   $print default-space:address:array:location #? 1</span>
<span class="CommentedCode">#?   $exit #? 1</span>
<span class="CommentedCode">#?   $start-tracing #? 1</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  x:event, console:address, found?:boolean, quit?:boolean<span class="Special"> &lt;- </span>read-event console:address
<span class="CommentedCode">#?   $print [aaa 1] #? 1</span>
  <span class="muControl">reply-if</span> quit?:boolean, <span class="Constant">0:literal</span>, console:address/same-as-ingredient:0, found?:boolean, quit?:boolean
<span class="CommentedCode">#?   $print [aaa 2] #? 1</span>
  <span class="muControl">reply-unless</span> found?:boolean, <span class="Constant">0:literal</span>, console:address/same-as-ingredient:0, found?:boolean, quit?:boolean
<span class="CommentedCode">#?   $print [aaa 3] #? 1</span>
  c:address:character<span class="Special"> &lt;- </span>maybe-convert x:event, text:variant
  <span class="muControl">reply-unless</span> c:address:character, <span class="Constant">0:literal</span>, console:address/same-as-ingredient:0, <span class="Constant">0:literal/found</span>, <span class="Constant">0:literal/quit</span>
<span class="CommentedCode">#?   $print [aaa 4] #? 1</span>
  <span class="muControl">reply</span> c:address:character/deref, console:address/same-as-ingredient:0, <span class="Constant">1:literal/found</span>, <span class="Constant">0:literal/quit</span>
]

<span class="muRecipe">recipe</span> send-keys-to-channel [
  <span class="Constant">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  screen:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    c:character, console:address, found?:boolean, quit?:boolean<span class="Special"> &lt;- </span>read-key console:address
    <span class="muControl">loop-unless</span> found?:boolean
    <span class="muControl">break-if</span> quit?:boolean
    assert c:character, <span class="Constant">[invalid event, expected text]</span>
    print-character screen:address, c:character
    chan:address:channel<span class="Special"> &lt;- </span>write chan:address:channel, c:character
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">recipe</span> wait-for-event [
  <span class="Constant">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    _, console:address, found?:boolean<span class="Special"> &lt;- </span>read-event console:address
    <span class="muControl">loop-unless</span> found?:boolean
  <span class="Delimiter">}</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">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> console:address
    <span class="Comment"># fake consoles should be plenty fast; never skip</span>
    <span class="muControl">reply</span> <span class="Constant">0:literal/false</span>
  <span class="Delimiter">}</span>
  result:boolean<span class="Special"> &lt;- </span>interactions-left?
  <span class="muControl">reply</span> result:boolean
]
</pre>
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