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<pre id='vimCodeElement'>
<span class="Comment"># new type to help incrementally scan arrays</span>
<span class="muData">container</span> stream:_elem [
  index:num
  data:&amp;:@:_elem
]

<span class="muRecipe">def</span> new-stream s:&amp;:@:_elem<span class="muRecipe"> -&gt; </span>result:&amp;:stream:_elem [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  result<span class="Special"> &lt;- </span>new <span class="Delimiter">{</span>(stream _elem): type<span class="Delimiter">}</span>
  *result<span class="Special"> &lt;- </span>put *result, <span class="Constant">index:offset</span>, <span class="Constant">0</span>
  *result<span class="Special"> &lt;- </span>put *result, <span class="Constant">data:offset</span>, s
]

<span class="muRecipe">def</span> rewind in:&amp;:stream:_elem<span class="muRecipe"> -&gt; </span>in:&amp;:stream:_elem [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  *in<span class="Special"> &lt;- </span>put *in, <span class="Constant">index:offset</span>, <span class="Constant">0</span>
]

<span class="muRecipe">def</span> read in:&amp;:stream:_elem<span class="muRecipe"> -&gt; </span>result:_elem, empty?:bool, in:&amp;:stream:_elem [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  empty?<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
  idx:num<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:&amp;:@:_elem<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  len:num<span class="Special"> &lt;- </span>length *s
  at-end?:bool<span class="Special"> &lt;- </span>greater-or-equal idx len
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> at-end?
    empty-result:&amp;:_elem<span class="Special"> &lt;- </span>new <span class="Constant">_elem:type</span>
    <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
  <span class="Delimiter">}</span>
  result<span class="Special"> &lt;- </span>index *s, idx
  idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
  *in<span class="Special"> &lt;- </span>put *in, <span class="Constant">index:offset</span>, idx
]

<span class="muRecipe">def</span> peek in:&amp;:stream:_elem<span class="muRecipe"> -&gt; </span>result:_elem, empty?:bool [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  empty?:bool<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
  idx:num<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:&amp;:@:_elem<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  len:num<span class="Special"> &lt;- </span>length *s
  at-end?:bool<span class="Special"> &lt;- </span>greater-or-equal idx len
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> at-end?
    empty-result:&amp;:_elem<span class="Special"> &lt;- </span>new <span class="Constant">_elem:type</span>
    <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
  <span class="Delimiter">}</span>
  result<span class="Special"> &lt;- </span>index *s, idx
]

<span class="muRecipe">def</span> read-line in:&amp;:stream:char<span class="muRecipe"> -&gt; </span>result:text, in:&amp;:stream:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  idx:num<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:text<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  next-idx:num<span class="Special"> &lt;- </span>find-next s, <span class="Constant">10/newline</span>, idx
  result<span class="Special"> &lt;- </span>copy-range s, idx, next-idx
  idx<span class="Special"> &lt;- </span>add next-idx, <span class="Constant">1</span>  <span class="Comment"># skip newline</span>
  <span class="Comment"># write back</span>
  *in<span class="Special"> &lt;- </span>put *in, <span class="Constant">index:offset</span>, idx
]

<span class="muRecipe">def</span> end-of-stream? in:&amp;:stream:_elem<span class="muRecipe"> -&gt; </span>result:bool [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  idx:num<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:&amp;:@:_elem<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  len:num<span class="Special"> &lt;- </span>length *s
  result<span class="Special"> &lt;- </span>greater-or-equal idx, len
]
</pre>
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