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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># A list links up multiple objects together to make them easier to manage.</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># The objects must be of the same type. If you want to store multiple types in</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># a single list, use an exclusive-container.</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="muData">container</span> <a href='064list.mu.html#L6'>list</a>:_elem [
<span id="L7" class="LineNr"> 7 </span> value:_elem
<span id="L8" class="LineNr"> 8 </span> <a href='065duplex_list.mu.html#L31'>next</a>:&:<a href='064list.mu.html#L6'>list</a>:_elem
<span id="L9" class="LineNr"> 9 </span>]
<span id="L10" class="LineNr"> 10 </span>
<span id="L11" class="LineNr"> 11 </span><span class="muRecipe">def</span> push x:_elem, l:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:&:<a href='064list.mu.html#L6'>list</a>:_elem/contained-in:l [
<span id="L12" class="LineNr"> 12 </span> <span class="Constant">local-scope</span>
<span id="L13" class="LineNr"> 13 </span> <span class="Constant">load-inputs</span>
<span id="L14" class="LineNr"> 14 </span> result <span class="Special"><-</span> new <span class="Delimiter">{</span>(list _elem): type<span class="Delimiter">}</span>
<span id="L15" class="LineNr"> 15 </span> *result <span class="Special"><-</span> merge x, l
<span id="L16" class="LineNr"> 16 </span>]
<span id="L17" class="LineNr"> 17 </span>
<span id="L18" class="LineNr"> 18 </span><span class="muRecipe">def</span> first in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:_elem [
<span id="L19" class="LineNr"> 19 </span> <span class="Constant">local-scope</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Constant">load-inputs</span>
<span id="L21" class="LineNr"> 21 </span> result <span class="Special"><-</span> get *in, <span class="Constant">value:offset</span>
<span id="L22" class="LineNr"> 22 </span>]
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="muRecipe">def</span> <a href='064list.mu.html#L24'>rest</a> in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:&:<a href='064list.mu.html#L6'>list</a>:_elem/contained-in:in [
<span id="L25" class="LineNr"> 25 </span> <span class="Constant">local-scope</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Constant">load-inputs</span>
<span id="L27" class="LineNr"> 27 </span> result <span class="Special"><-</span> get *in, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>
<span id="L28" class="LineNr"> 28 </span>]
<span id="L29" class="LineNr"> 29 </span>
<span id="L30" class="LineNr"> 30 </span><span class="muScenario">scenario</span> list-handling [
<span id="L31" class="LineNr"> 31 </span> run [
<span id="L32" class="LineNr"> 32 </span> <span class="Constant">local-scope</span>
<span id="L33" class="LineNr"> 33 </span> x:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L34" class="LineNr"> 34 </span> x <span class="Special"><-</span> push<span class="Constant"> 4</span>, x
<span id="L35" class="LineNr"> 35 </span> x <span class="Special"><-</span> push<span class="Constant"> 5</span>, x
<span id="L36" class="LineNr"> 36 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> first x
<span id="L37" class="LineNr"> 37 </span> x <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> x
<span id="L38" class="LineNr"> 38 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first x
<span id="L39" class="LineNr"> 39 </span> x <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> x
<span id="L40" class="LineNr"> 40 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first x
<span id="L41" class="LineNr"> 41 </span> 20:&:<a href='064list.mu.html#L6'>list</a>:num/<span class="Special">raw</span> <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> x
<span id="L42" class="LineNr"> 42 </span> ]
<span id="L43" class="LineNr"> 43 </span> memory-should-contain [
<span id="L44" class="LineNr"> 44 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 5</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 4</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Constant"> 20</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># nothing left</span>
<span id="L48" class="LineNr"> 48 </span> ]
<span id="L49" class="LineNr"> 49 </span>]
<span id="L50" class="LineNr"> 50 </span>
<span id="L51" class="LineNr"> 51 </span><span class="muRecipe">def</span> length l:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:num [
<span id="L52" class="LineNr"> 52 </span> <span class="Constant">local-scope</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Constant">load-inputs</span>
<span id="L54" class="LineNr"> 54 </span> result <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Delimiter">{</span>
<span id="L56" class="LineNr"> 56 </span> <span class="muControl">break-unless</span> l
<span id="L57" class="LineNr"> 57 </span> result <span class="Special"><-</span> add result,<span class="Constant"> 1</span>
<span id="L58" class="LineNr"> 58 </span> l <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> l
<span id="L59" class="LineNr"> 59 </span> <span class="muControl"> loop</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Delimiter">}</span>
<span id="L61" class="LineNr"> 61 </span>]
<span id="L62" class="LineNr"> 62 </span>
<span id="L63" class="LineNr"> 63 </span><span class="Comment"># insert 'x' after 'in'</span>
<span id="L64" class="LineNr"> 64 </span><span class="muRecipe">def</span> insert x:_elem, in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>in:&:<a href='064list.mu.html#L6'>list</a>:_elem [
<span id="L65" class="LineNr"> 65 </span> <span class="Constant">local-scope</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Constant">load-inputs</span>
<span id="L67" class="LineNr"> 67 </span> new-node:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> new <span class="Delimiter">{</span>(list _elem): type<span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span> *new-node <span class="Special"><-</span> put *new-node, <span class="Constant">value:offset</span>, x
<span id="L69" class="LineNr"> 69 </span> next-node:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> get *in, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>
<span id="L70" class="LineNr"> 70 </span> *in <span class="Special"><-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>, new-node
<span id="L71" class="LineNr"> 71 </span> *new-node <span class="Special"><-</span> put *new-node, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>, next-node
<span id="L72" class="LineNr"> 72 </span>]
<span id="L73" class="LineNr"> 73 </span>
<span id="L74" class="LineNr"> 74 </span><span class="muScenario">scenario</span> inserting-into-list [
<span id="L75" class="LineNr"> 75 </span> <span class="Constant">local-scope</span>
<span id="L76" class="LineNr"> 76 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L77" class="LineNr"> 77 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L78" class="LineNr"> 78 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L79" class="LineNr"> 79 </span> run [
<span id="L80" class="LineNr"> 80 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> <a href='064list.mu.html#L6'>list</a> <span class="Comment"># inside list</span>
<span id="L81" class="LineNr"> 81 </span> list2 <span class="Special"><-</span> insert<span class="Constant"> 6</span>, list2
<span id="L82" class="LineNr"> 82 </span> <span class="Comment"># check structure</span>
<span id="L83" class="LineNr"> 83 </span> list2 <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L84" class="LineNr"> 84 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L85" class="LineNr"> 85 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L86" class="LineNr"> 86 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L87" class="LineNr"> 87 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L88" class="LineNr"> 88 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L89" class="LineNr"> 89 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L90" class="LineNr"> 90 </span> 13:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L91" class="LineNr"> 91 </span> ]
<span id="L92" class="LineNr"> 92 </span> memory-should-contain [
<span id="L93" class="LineNr"> 93 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 5</span> <span class="Comment"># scanning next</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 4</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 6</span> <span class="Comment"># inserted element</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Constant"> 13</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L97" class="LineNr"> 97 </span> ]
<span id="L98" class="LineNr"> 98 </span>]
<span id="L99" class="LineNr"> 99 </span>
<span id="L100" class="LineNr">100 </span><span class="muScenario">scenario</span> inserting-at-end-of-list [
<span id="L101" class="LineNr">101 </span> <span class="Constant">local-scope</span>
<span id="L102" class="LineNr">102 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L103" class="LineNr">103 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L104" class="LineNr">104 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L105" class="LineNr">105 </span> run [
<span id="L106" class="LineNr">106 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> <a href='064list.mu.html#L6'>list</a> <span class="Comment"># inside list</span>
<span id="L107" class="LineNr">107 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2 <span class="Comment"># now at end of list</span>
<span id="L108" class="LineNr">108 </span> list2 <span class="Special"><-</span> insert<span class="Constant"> 6</span>, list2
<span id="L109" class="LineNr">109 </span> <span class="Comment"># check structure like before</span>
<span id="L110" class="LineNr">110 </span> list2 <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L111" class="LineNr">111 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L112" class="LineNr">112 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L113" class="LineNr">113 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L114" class="LineNr">114 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L115" class="LineNr">115 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L116" class="LineNr">116 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L117" class="LineNr">117 </span> 13:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L118" class="LineNr">118 </span> ]
<span id="L119" class="LineNr">119 </span> memory-should-contain [
<span id="L120" class="LineNr">120 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 5</span> <span class="Comment"># scanning next</span>
<span id="L121" class="LineNr">121 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 4</span>
<span id="L122" class="LineNr">122 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L123" class="LineNr">123 </span> <span class="Constant"> 13</span> <span class="Special"><-</span><span class="Constant"> 6</span> <span class="Comment"># inserted element</span>
<span id="L124" class="LineNr">124 </span> ]
<span id="L125" class="LineNr">125 </span>]
<span id="L126" class="LineNr">126 </span>
<span id="L127" class="LineNr">127 </span><span class="muScenario">scenario</span> inserting-after-start-of-list [
<span id="L128" class="LineNr">128 </span> <span class="Constant">local-scope</span>
<span id="L129" class="LineNr">129 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L130" class="LineNr">130 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L131" class="LineNr">131 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L132" class="LineNr">132 </span> run [
<span id="L133" class="LineNr">133 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> insert<span class="Constant"> 6</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L134" class="LineNr">134 </span> <span class="Comment"># check structure like before</span>
<span id="L135" class="LineNr">135 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L136" class="LineNr">136 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L137" class="LineNr">137 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L138" class="LineNr">138 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L139" class="LineNr">139 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L140" class="LineNr">140 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L141" class="LineNr">141 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L142" class="LineNr">142 </span> 13:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L143" class="LineNr">143 </span> ]
<span id="L144" class="LineNr">144 </span> memory-should-contain [
<span id="L145" class="LineNr">145 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 5</span> <span class="Comment"># scanning next</span>
<span id="L146" class="LineNr">146 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 6</span> <span class="Comment"># inserted element</span>
<span id="L147" class="LineNr">147 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 4</span>
<span id="L148" class="LineNr">148 </span> <span class="Constant"> 13</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L149" class="LineNr">149 </span> ]
<span id="L150" class="LineNr">150 </span>]
<span id="L151" class="LineNr">151 </span>
<span id="L152" class="LineNr">152 </span><span class="Comment"># remove 'x' from its surrounding list 'in'</span>
<span id="L153" class="LineNr">153 </span><span class="Comment">#</span>
<span id="L154" class="LineNr">154 </span><span class="Comment"># Returns null if and only if list is empty. Beware: in that case any other</span>
<span id="L155" class="LineNr">155 </span><span class="Comment"># pointers to the head are now invalid.</span>
<span id="L156" class="LineNr">156 </span><span class="muRecipe">def</span> remove x:&:<a href='064list.mu.html#L6'>list</a>:_elem/contained-in:in, in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>in:&:<a href='064list.mu.html#L6'>list</a>:_elem [
<span id="L157" class="LineNr">157 </span> <span class="Constant">local-scope</span>
<span id="L158" class="LineNr">158 </span> <span class="Constant">load-inputs</span>
<span id="L159" class="LineNr">159 </span> <span class="Comment"># if 'x' is null, return</span>
<span id="L160" class="LineNr">160 </span> <span class="muControl">return-unless</span> x
<span id="L161" class="LineNr">161 </span> next-node:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> x
<span id="L162" class="LineNr">162 </span> <span class="Comment"># clear next pointer of 'x'</span>
<span id="L163" class="LineNr">163 </span> *x <span class="Special"><-</span> put *x, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>,<span class="Constant"> null</span>
<span id="L164" class="LineNr">164 </span> <span class="Comment"># if 'x' is at the head of 'in', return the new head</span>
<span id="L165" class="LineNr">165 </span> at-head?:bool <span class="Special"><-</span> equal x, in
<span id="L166" class="LineNr">166 </span> <span class="muControl">return-if</span> at-head?, next-node
<span id="L167" class="LineNr">167 </span> <span class="Comment"># compute prev-node</span>
<span id="L168" class="LineNr">168 </span> prev-node:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> copy in
<span id="L169" class="LineNr">169 </span> curr:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> prev-node
<span id="L170" class="LineNr">170 </span> <span class="Delimiter">{</span>
<span id="L171" class="LineNr">171 </span> <span class="muControl">return-unless</span> curr
<span id="L172" class="LineNr">172 </span> found?:bool <span class="Special"><-</span> equal curr, x
<span id="L173" class="LineNr">173 </span> <span class="muControl">break-if</span> found?
<span id="L174" class="LineNr">174 </span> prev-node <span class="Special"><-</span> copy curr
<span id="L175" class="LineNr">175 </span> curr <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> curr
<span id="L176" class="LineNr">176 </span> <span class="Delimiter">}</span>
<span id="L177" class="LineNr">177 </span> <span class="Comment"># set its next pointer to skip 'x'</span>
<span id="L178" class="LineNr">178 </span> *prev-node <span class="Special"><-</span> put *prev-node, <span class="Constant"><a href='065duplex_list.mu.html#L31'>next</a>:offset</span>, next-node
<span id="L179" class="LineNr">179 </span>]
<span id="L180" class="LineNr">180 </span>
<span id="L181" class="LineNr">181 </span><span class="muScenario">scenario</span> removing-from-list [
<span id="L182" class="LineNr">182 </span> <span class="Constant">local-scope</span>
<span id="L183" class="LineNr">183 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L184" class="LineNr">184 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L185" class="LineNr">185 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L186" class="LineNr">186 </span> run [
<span id="L187" class="LineNr">187 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> <a href='064list.mu.html#L6'>list</a> <span class="Comment"># second element</span>
<span id="L188" class="LineNr">188 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> remove list2, <a href='064list.mu.html#L6'>list</a>
<span id="L189" class="LineNr">189 </span> 10:bool/<span class="Special">raw</span> <span class="Special"><-</span> equal list2,<span class="Constant"> null</span>
<span id="L190" class="LineNr">190 </span> <span class="Comment"># check structure like before</span>
<span id="L191" class="LineNr">191 </span> list2 <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L192" class="LineNr">192 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L193" class="LineNr">193 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L194" class="LineNr">194 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L195" class="LineNr">195 </span> 20:&:<a href='064list.mu.html#L6'>list</a>:num/<span class="Special">raw</span> <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L196" class="LineNr">196 </span> ]
<span id="L197" class="LineNr">197 </span> memory-should-contain [
<span id="L198" class="LineNr">198 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># remove returned non-null</span>
<span id="L199" class="LineNr">199 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 5</span> <span class="Comment"># scanning next, skipping deleted element</span>
<span id="L200" class="LineNr">200 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L201" class="LineNr">201 </span> <span class="Constant"> 20</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># no more elements</span>
<span id="L202" class="LineNr">202 </span> ]
<span id="L203" class="LineNr">203 </span>]
<span id="L204" class="LineNr">204 </span>
<span id="L205" class="LineNr">205 </span><span class="muScenario">scenario</span> removing-from-start-of-list [
<span id="L206" class="LineNr">206 </span> <span class="Constant">local-scope</span>
<span id="L207" class="LineNr">207 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L208" class="LineNr">208 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L209" class="LineNr">209 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L210" class="LineNr">210 </span> run [
<span id="L211" class="LineNr">211 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> remove <a href='064list.mu.html#L6'>list</a>, <a href='064list.mu.html#L6'>list</a>
<span id="L212" class="LineNr">212 </span> <span class="Comment"># check structure like before</span>
<span id="L213" class="LineNr">213 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L214" class="LineNr">214 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L215" class="LineNr">215 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L216" class="LineNr">216 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L217" class="LineNr">217 </span> 20:&:<a href='064list.mu.html#L6'>list</a>:num/<span class="Special">raw</span> <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L218" class="LineNr">218 </span> ]
<span id="L219" class="LineNr">219 </span> memory-should-contain [
<span id="L220" class="LineNr">220 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 4</span> <span class="Comment"># scanning next, skipping deleted element</span>
<span id="L221" class="LineNr">221 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 3</span>
<span id="L222" class="LineNr">222 </span> <span class="Constant"> 20</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># no more elements</span>
<span id="L223" class="LineNr">223 </span> ]
<span id="L224" class="LineNr">224 </span>]
<span id="L225" class="LineNr">225 </span>
<span id="L226" class="LineNr">226 </span><span class="muScenario">scenario</span> removing-from-end-of-list [
<span id="L227" class="LineNr">227 </span> <span class="Constant">local-scope</span>
<span id="L228" class="LineNr">228 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L229" class="LineNr">229 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 4</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L230" class="LineNr">230 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 5</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L231" class="LineNr">231 </span> run [
<span id="L232" class="LineNr">232 </span> <span class="Comment"># delete last element</span>
<span id="L233" class="LineNr">233 </span> list2:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> <a href='064list.mu.html#L6'>list</a>
<span id="L234" class="LineNr">234 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L235" class="LineNr">235 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> remove list2, <a href='064list.mu.html#L6'>list</a>
<span id="L236" class="LineNr">236 </span> 10:bool/<span class="Special">raw</span> <span class="Special"><-</span> equal list2,<span class="Constant"> null</span>
<span id="L237" class="LineNr">237 </span> <span class="Comment"># check structure like before</span>
<span id="L238" class="LineNr">238 </span> list2 <span class="Special"><-</span> copy <a href='064list.mu.html#L6'>list</a>
<span id="L239" class="LineNr">239 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L240" class="LineNr">240 </span> list2 <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L241" class="LineNr">241 </span> 12:num/<span class="Special">raw</span> <span class="Special"><-</span> first list2
<span id="L242" class="LineNr">242 </span> 20:&:<a href='064list.mu.html#L6'>list</a>:num/<span class="Special">raw</span> <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> list2
<span id="L243" class="LineNr">243 </span> ]
<span id="L244" class="LineNr">244 </span> memory-should-contain [
<span id="L245" class="LineNr">245 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># remove returned non-null</span>
<span id="L246" class="LineNr">246 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 5</span> <span class="Comment"># scanning next, skipping deleted element</span>
<span id="L247" class="LineNr">247 </span> <span class="Constant"> 12</span> <span class="Special"><-</span><span class="Constant"> 4</span>
<span id="L248" class="LineNr">248 </span> <span class="Constant"> 20</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># no more elements</span>
<span id="L249" class="LineNr">249 </span> ]
<span id="L250" class="LineNr">250 </span>]
<span id="L251" class="LineNr">251 </span>
<span id="L252" class="LineNr">252 </span><span class="muScenario">scenario</span> removing-from-singleton-list [
<span id="L253" class="LineNr">253 </span> <span class="Constant">local-scope</span>
<span id="L254" class="LineNr">254 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 3</span>,<span class="Constant"> null</span>
<span id="L255" class="LineNr">255 </span> run [
<span id="L256" class="LineNr">256 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> remove <a href='064list.mu.html#L6'>list</a>, <a href='064list.mu.html#L6'>list</a>
<span id="L257" class="LineNr">257 </span> 1:num/<span class="Special">raw</span> <span class="Special"><-</span> deaddress <a href='064list.mu.html#L6'>list</a>
<span id="L258" class="LineNr">258 </span> ]
<span id="L259" class="LineNr">259 </span> memory-should-contain [
<span id="L260" class="LineNr">260 </span> <span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># back to an empty list</span>
<span id="L261" class="LineNr">261 </span> ]
<span id="L262" class="LineNr">262 </span>]
<span id="L263" class="LineNr">263 </span>
<span id="L264" class="LineNr">264 </span><span class="Comment"># reverse the elements of a list</span>
<span id="L265" class="LineNr">265 </span><span class="Comment"># (contributed by Caleb Couch)</span>
<span id="L266" class="LineNr">266 </span><span class="muRecipe">def</span> reverse <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:_elem temp:&:<a href='064list.mu.html#L6'>list</a>:_elem/contained-in:result<span class="muRecipe"> -> </span>result:&:<a href='064list.mu.html#L6'>list</a>:_elem [
<span id="L267" class="LineNr">267 </span> <span class="Constant">local-scope</span>
<span id="L268" class="LineNr">268 </span> <span class="Constant">load-inputs</span>
<span id="L269" class="LineNr">269 </span> <span class="muControl">return-unless</span> <a href='064list.mu.html#L6'>list</a>, temp
<span id="L270" class="LineNr">270 </span> object:_elem <span class="Special"><-</span> first, <a href='064list.mu.html#L6'>list</a>
<span id="L271" class="LineNr">271 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> <a href='064list.mu.html#L6'>list</a>
<span id="L272" class="LineNr">272 </span> temp <span class="Special"><-</span> push object, temp
<span id="L273" class="LineNr">273 </span> result <span class="Special"><-</span> reverse <a href='064list.mu.html#L6'>list</a>, temp
<span id="L274" class="LineNr">274 </span>]
<span id="L275" class="LineNr">275 </span>
<span id="L276" class="LineNr">276 </span><span class="muScenario">scenario</span> reverse-list [
<span id="L277" class="LineNr">277 </span> <span class="Constant">local-scope</span>
<span id="L278" class="LineNr">278 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 1</span>,<span class="Constant"> null</span>
<span id="L279" class="LineNr">279 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 2</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L280" class="LineNr">280 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 3</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L281" class="LineNr">281 </span> run [
<span id="L282" class="LineNr">282 </span> stash <span class="Constant">[list:]</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L283" class="LineNr">283 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> reverse <a href='064list.mu.html#L6'>list</a>
<span id="L284" class="LineNr">284 </span> stash <span class="Constant">[reversed:]</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L285" class="LineNr">285 </span> ]
<span id="L286" class="LineNr">286 </span> trace-should-contain [
<span id="L287" class="LineNr">287 </span> app: <a href='064list.mu.html#L6'>list</a>:<span class="Constant"> 3</span><span class="muRecipe"> -> </span>2<span class="muRecipe"> -> </span>1
<span id="L288" class="LineNr">288 </span> app: reversed:<span class="Constant"> 1</span><span class="muRecipe"> -> </span>2<span class="muRecipe"> -> </span>3
<span id="L289" class="LineNr">289 </span> ]
<span id="L290" class="LineNr">290 </span>]
<span id="L291" class="LineNr">291 </span>
<span id="L292" class="LineNr">292 </span><span class="muScenario">scenario</span> stash-list [
<span id="L293" class="LineNr">293 </span> <span class="Constant">local-scope</span>
<span id="L294" class="LineNr">294 </span> <a href='064list.mu.html#L6'>list</a>:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> push<span class="Constant"> 1</span>,<span class="Constant"> null</span>
<span id="L295" class="LineNr">295 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 2</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L296" class="LineNr">296 </span> <a href='064list.mu.html#L6'>list</a> <span class="Special"><-</span> push<span class="Constant"> 3</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L297" class="LineNr">297 </span> run [
<span id="L298" class="LineNr">298 </span> stash <span class="Constant">[list:]</span>, <a href='064list.mu.html#L6'>list</a>
<span id="L299" class="LineNr">299 </span> ]
<span id="L300" class="LineNr">300 </span> trace-should-contain [
<span id="L301" class="LineNr">301 </span> app: <a href='064list.mu.html#L6'>list</a>:<span class="Constant"> 3</span><span class="muRecipe"> -> </span>2<span class="muRecipe"> -> </span>1
<span id="L302" class="LineNr">302 </span> ]
<span id="L303" class="LineNr">303 </span>]
<span id="L304" class="LineNr">304 </span>
<span id="L305" class="LineNr">305 </span><span class="muRecipe">def</span> to-text in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:text [
<span id="L306" class="LineNr">306 </span> <span class="Constant">local-scope</span>
<span id="L307" class="LineNr">307 </span> <span class="Constant">load-inputs</span>
<span id="L308" class="LineNr">308 </span> buf:&:<a href='061text.mu.html#L120'>buffer</a>:char <span class="Special"><-</span> <a href='061text.mu.html#L125'>new-buffer</a><span class="Constant"> 80</span>
<span id="L309" class="LineNr">309 </span> buf <span class="Special"><-</span> to-buffer in, buf
<span id="L310" class="LineNr">310 </span> result <span class="Special"><-</span> <a href='061text.mu.html#L338'>buffer-to-array</a> buf
<span id="L311" class="LineNr">311 </span>]
<span id="L312" class="LineNr">312 </span>
<span id="L313" class="LineNr">313 </span><span class="Comment"># variant of 'to-text' which stops printing after a few elements (and so is robust to cycles)</span>
<span id="L314" class="LineNr">314 </span><span class="muRecipe">def</span> to-text-line in:&:<a href='064list.mu.html#L6'>list</a>:_elem<span class="muRecipe"> -> </span>result:text [
<span id="L315" class="LineNr">315 </span> <span class="Constant">local-scope</span>
<span id="L316" class="LineNr">316 </span> <span class="Constant">load-inputs</span>
<span id="L317" class="LineNr">317 </span> buf:&:<a href='061text.mu.html#L120'>buffer</a>:char <span class="Special"><-</span> <a href='061text.mu.html#L125'>new-buffer</a><span class="Constant"> 80</span>
<span id="L318" class="LineNr">318 </span> buf <span class="Special"><-</span> to-buffer in, buf,<span class="Constant"> 6</span> <span class="Comment"># max elements to display</span>
<span id="L319" class="LineNr">319 </span> result <span class="Special"><-</span> <a href='061text.mu.html#L338'>buffer-to-array</a> buf
<span id="L320" class="LineNr">320 </span>]
<span id="L321" class="LineNr">321 </span>
<span id="L322" class="LineNr">322 </span><span class="muRecipe">def</span> to-buffer in:&:<a href='064list.mu.html#L6'>list</a>:_elem, buf:&:<a href='061text.mu.html#L120'>buffer</a>:char<span class="muRecipe"> -> </span>buf:&:<a href='061text.mu.html#L120'>buffer</a>:char [
<span id="L323" class="LineNr">323 </span> <span class="Constant">local-scope</span>
<span id="L324" class="LineNr">324 </span> <span class="Constant">load-inputs</span>
<span id="L325" class="LineNr">325 </span> <span class="Delimiter">{</span>
<span id="L326" class="LineNr">326 </span> <span class="muControl">break-if</span> in
<span id="L327" class="LineNr">327 </span> buf <span class="Special"><-</span> append buf, <span class="Constant">[[]</span>]
<span id="L328" class="LineNr">328 </span> <span class="muControl"> return</span>
<span id="L329" class="LineNr">329 </span> <span class="Delimiter">}</span>
<span id="L330" class="LineNr">330 </span> <span class="Comment"># append in.value to buf</span>
<span id="L331" class="LineNr">331 </span> val:_elem <span class="Special"><-</span> get *in, <span class="Constant">value:offset</span>
<span id="L332" class="LineNr">332 </span> buf <span class="Special"><-</span> append buf, val
<span id="L333" class="LineNr">333 </span> <span class="Comment"># now prepare next</span>
<span id="L334" class="LineNr">334 </span> <a href='065duplex_list.mu.html#L31'>next</a>:&:<a href='064list.mu.html#L6'>list</a>:_elem <span class="Special"><-</span> <a href='064list.mu.html#L24'>rest</a> in
<span id="L335" class="LineNr">335 </span> nextn:num <span class="Special"><-</span> deaddress <a href='065duplex_list.mu.html#L31'>next</a>
<span id="L336" class="LineNr">336 </span> <span class="muControl">return-unless</span> <a href='065duplex_list.mu.html#L31'>next</a>
<span id="L337" class="LineNr">337 </span> buf <span class="Special"><-</span> append buf, <span class="Constant">[ -> ]</span>
<span id="L338" class="LineNr">338 </span> <span class="Comment"># and recurse</span>
<span id="L339" class="LineNr">339 </span> remaining:num, optional-input-found?:bool <span class="Special"><-</span> <span class="Constant">next-input</span>
<span id="L340" class="LineNr">340 </span> <span class="Delimiter">{</span>
<span id="L341" class="LineNr">341 </span> <span class="muControl">break-if</span> optional-input-found?
<span id="L342" class="LineNr">342 </span> <span class="Comment"># unlimited recursion</span>
<span id="L343" class="LineNr">343 </span> buf <span class="Special"><-</span> to-buffer <a href='065duplex_list.mu.html#L31'>next</a>, buf
<span id="L344" class="LineNr">344 </span> <span class="muControl"> return</span>
<span id="L345" class="LineNr">345 </span> <span class="Delimiter">}</span>
<span id="L346" class="LineNr">346 </span> <span class="Delimiter">{</span>
<span id="L347" class="LineNr">347 </span> <span class="muControl">break-unless</span> remaining
<span id="L348" class="LineNr">348 </span> <span class="Comment"># limited recursion</span>
<span id="L349" class="LineNr">349 </span> remaining <span class="Special"><-</span> subtract remaining,<span class="Constant"> 1</span>
<span id="L350" class="LineNr">350 </span> buf <span class="Special"><-</span> to-buffer <a href='065duplex_list.mu.html#L31'>next</a>, buf, remaining
<span id="L351" class="LineNr">351 </span> <span class="muControl"> return</span>
<span id="L352" class="LineNr">352 </span> <span class="Delimiter">}</span>
<span id="L353" class="LineNr">353 </span> <span class="Comment"># past recursion depth; insert ellipses and stop</span>
<span id="L354" class="LineNr">354 </span> append buf, <span class="Constant">[...]</span>
<span id="L355" class="LineNr">355 </span>]
<span id="L356" class="LineNr">356 </span>
<span id="L357" class="LineNr">357 </span><span class="muScenario">scenario</span> stash-empty-list [
<span id="L358" class="LineNr">358 </span> <span class="Constant">local-scope</span>
<span id="L359" class="LineNr">359 </span> x:&:<a href='064list.mu.html#L6'>list</a>:num <span class="Special"><-</span> copy<span class="Constant"> null</span>
<span id="L360" class="LineNr">360 </span> run [
<span id="L361" class="LineNr">361 </span> stash x
<span id="L362" class="LineNr">362 </span> ]
<span id="L363" class="LineNr">363 </span> trace-should-contain [
<span id="L364" class="LineNr">364 </span> app: <span class="Constant">[]</span>
<span id="L365" class="LineNr">365 </span> ]
<span id="L366" class="LineNr">366 </span>]
</pre>
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