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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 066stream.mu</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="none">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 12pt; font-size: 1em; }
.muData { color: #ffff00; }
.muControl { color: #c0a020; }
.Delimiter { color: #800080; }
.Comment { color: #9090ff; }
.Constant { color: #00a0a0; }
.Special { color: #c00000; }
.muRecipe { color: #ff8700; }
-->
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<script type='text/javascript'>
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<body>
<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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</html>
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generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-18 18:59:23 +0000