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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around keyboard primitives that take a 'keyboard' object and are thus</span>
<span class="Comment"># easier to test.</span>
container keyboard <span class="Delimiter">[</span> <span class="Comment"># can't think of another word like screen/display, so real and fake keyboards use the same name</span>
index:integer
data:address:array:character
<span class="Delimiter">]</span>
recipe init-fake-keyboard <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
result:address:keyboard<span class="Special"> <- </span>new keyboard:type
buf:address:address:array:character<span class="Special"> <- </span>get-address result:address:keyboard/deref data:offset
<span class="CommentedCode">#? $start-tracing #? 1</span>
buf:address:address:array:character/deref<span class="Special"> <- </span>next-ingredient
<span class="CommentedCode">#? $stop-tracing #? 1</span>
idx:address:integer<span class="Special"> <- </span>get-address result:address:keyboard/deref index:offset
idx:address:integer/deref<span class="Special"> <- </span>copy 0:literal
<span class="Identifier">reply</span> result:address:keyboard
<span class="Delimiter">]</span>
recipe read-key <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:keyboard<span class="Special"> <- </span>next-ingredient
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:keyboard
idx:address:integer<span class="Special"> <- </span>get-address x:address:keyboard/deref, index:offset
buf:address:array:character<span class="Special"> <- </span>get x:address:keyboard/deref, data:offset
max:integer<span class="Special"> <- </span>length buf:address:array:character/deref
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal idx:address:integer/deref, max:integer
<span class="Identifier">break-unless</span> done?:boolean
<span class="Identifier">reply</span> 0:literal, 0:literal/done, x:address:keyboard/same-as-ingredient:0
<span class="Delimiter">}</span>
c:character<span class="Special"> <- </span>index buf:address:array:character/deref, idx:address:integer/deref
idx:address:integer/deref<span class="Special"> <- </span>add idx:address:integer/deref, 1:literal
<span class="Identifier">reply</span> c:character, 1:literal/found, x:address:keyboard/same-as-ingredient:0
<span class="Delimiter">}</span>
c:character, found?:boolean<span class="Special"> <- </span>read-key-from-keyboard
<span class="Identifier">reply</span> c:character, found?:boolean, x:address:keyboard/same-as-ingredient:0
<span class="Delimiter">]</span>
recipe wait-for-key <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:keyboard<span class="Special"> <- </span>next-ingredient
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> x:address:keyboard
<span class="Comment"># on fake keyboards 'wait-for-key' behaves just like 'read-key'</span>
c:character, x:address:keyboard<span class="Special"> <- </span>read-key x:address:keyboard
<span class="Identifier">reply</span> c:character, x:address:keyboard/same-as-ingredient:0
<span class="Delimiter">}</span>
c:character<span class="Special"> <- </span>wait-for-key-from-keyboard
<span class="Identifier">reply</span> c:character, x:address:keyboard/same-as-ingredient:0
<span class="Delimiter">]</span>
</pre>
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