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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - 077stream.mu</title>
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* { font-size: 12pt; font-size: 1em; }
.muRecipe { color: #ff8700; }
.muData { color: #ffff00; }
.Comment { color: #9090ff; }
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<pre id='vimCodeElement'>
<span class="Comment"># new type to help incrementally read texts (arrays of characters)</span>
<span class="muData">container</span> stream [
  index:number
  data:address:array:character
]

<span class="muRecipe">def</span> new-stream s:address:array:character<span class="muRecipe"> -&gt; </span>result:address:stream [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  result<span class="Special"> &lt;- </span>new <span class="Constant">stream:type</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-stream in:address:stream<span class="muRecipe"> -&gt; </span>in:address:stream [
  <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-line in:address:stream<span class="muRecipe"> -&gt; </span>result:address:array:character, in:address:stream [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  idx:number<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:address:array:character<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  next-idx:number<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:address:stream<span class="muRecipe"> -&gt; </span>result:boolean [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  idx:number<span class="Special"> &lt;- </span>get *in, <span class="Constant">index:offset</span>
  s:address:array:character<span class="Special"> &lt;- </span>get *in, <span class="Constant">data:offset</span>
  len:number<span class="Special"> &lt;- </span>length *s
  result<span class="Special"> &lt;- </span>greater-or-equal idx, len
]
</pre>
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