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<span class="Comment"># A list links up multiple objects together to make them easier to manage.</span>
<span class="Comment">#</span>
<span class="Comment"># The objects must be of the same type. If you want to store multiple types in</span>
<span class="Comment"># a single list, use an exclusive-container.</span>
<span class="muData">container</span> list:_elem [
value:_elem
next:&:list:_elem
]
<span class="muRecipe">def</span> push x:_elem, l:&:list:_elem<span class="muRecipe"> -> </span>l:&:list:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result:&:list:_elem<span class="Special"> <- </span>new <span class="Delimiter">{</span>(list _elem): type<span class="Delimiter">}</span>
*result<span class="Special"> <- </span>merge x, l
<span class="muControl">reply</span> result
]
<span class="muRecipe">def</span> first in:&:list:_elem<span class="muRecipe"> -> </span>result:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>get *in, <span class="Constant">value:offset</span>
]
<span class="muRecipe">def</span> rest in:&:list:_elem<span class="muRecipe"> -> </span>result:&:list:_elem/contained-in:in [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>get *in, <span class="Constant">next:offset</span>
]
<span class="muScenario">scenario</span> list-handling [
run [
<span class="Constant">local-scope</span>
x:&:list:num<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
x<span class="Special"> <- </span>push <span class="Constant">4</span>, x
x<span class="Special"> <- </span>push <span class="Constant">5</span>, x
<span class="Constant">10</span>:num/<span class="Special">raw <- </span>first x
x<span class="Special"> <- </span>rest x
<span class="Constant">11</span>:num/<span class="Special">raw <- </span>first x
x<span class="Special"> <- </span>rest x
<span class="Constant">12</span>:num/<span class="Special">raw <- </span>first x
<span class="Constant">20</span>:&:list:num/<span class="Special">raw <- </span>rest x
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">5</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># nothing left</span>
]
]
<span class="muRecipe">def</span> length l:&:list:_elem<span class="muRecipe"> -> </span>result:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">return-unless</span> l, <span class="Constant">0</span>
rest:&:list:_elem<span class="Special"> <- </span>rest l
length-of-rest:num<span class="Special"> <- </span>length rest
result<span class="Special"> <- </span>add length-of-rest, <span class="Constant">1</span>
]
<span class="Comment"># insert 'x' after 'in'</span>
<span class="muRecipe">def</span> insert x:_elem, in:&:list:_elem<span class="muRecipe"> -> </span>in:&:list:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
new-node:&:list:_elem<span class="Special"> <- </span>new <span class="Delimiter">{</span>(list _elem): type<span class="Delimiter">}</span>
*new-node<span class="Special"> <- </span>put *new-node, <span class="Constant">value:offset</span>, x
next-node:&:list:_elem<span class="Special"> <- </span>get *in, <span class="Constant">next:offset</span>
*in<span class="Special"> <- </span>put *in, <span class="Constant">next:offset</span>, new-node
*new-node<span class="Special"> <- </span>put *new-node, <span class="Constant">next:offset</span>, next-node
]
<span class="muScenario">scenario</span> inserting-into-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
list2:&:list:char<span class="Special"> <- </span>rest list <span class="Comment"># inside list</span>
list2<span class="Special"> <- </span>insert <span class="Constant">6</span>, list2
<span class="Comment"># check structure</span>
list2<span class="Special"> <- </span>copy list
<span class="Constant">10</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">12</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">13</span>:char/<span class="Special">raw <- </span>first list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">5</span> <span class="Comment"># scanning next</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># inserted element</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">3</span>
]
]
<span class="muScenario">scenario</span> inserting-at-end-of-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
list2:&:list:char<span class="Special"> <- </span>rest list <span class="Comment"># inside list</span>
list2<span class="Special"> <- </span>rest list2 <span class="Comment"># now at end of list</span>
list2<span class="Special"> <- </span>insert <span class="Constant">6</span>, list2
<span class="Comment"># check structure like before</span>
list2<span class="Special"> <- </span>copy list
<span class="Constant">10</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">12</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">13</span>:char/<span class="Special">raw <- </span>first list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">5</span> <span class="Comment"># scanning next</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># inserted element</span>
]
]
<span class="muScenario">scenario</span> inserting-after-start-of-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
list<span class="Special"> <- </span>insert <span class="Constant">6</span>, list
<span class="Comment"># check structure like before</span>
list2:&:list:char<span class="Special"> <- </span>copy list
<span class="Constant">10</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">12</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">13</span>:char/<span class="Special">raw <- </span>first list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">5</span> <span class="Comment"># scanning next</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">6</span> <span class="Comment"># inserted element</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">3</span>
]
]
<span class="Comment"># remove 'x' from its surrounding list 'in'</span>
<span class="Comment">#</span>
<span class="Comment"># Returns null if and only if list is empty. Beware: in that case any other</span>
<span class="Comment"># pointers to the head are now invalid.</span>
<span class="muRecipe">def</span> remove x:&:list:_elem/contained-in:in, in:&:list:_elem<span class="muRecipe"> -> </span>in:&:list:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># if 'x' is null, return</span>
<span class="muControl">return-unless</span> x
next-node:&:list:_elem<span class="Special"> <- </span>rest x
<span class="Comment"># clear next pointer of 'x'</span>
*x<span class="Special"> <- </span>put *x, <span class="Constant">next:offset</span>, <span class="Constant">0</span>
<span class="Comment"># if 'x' is at the head of 'in', return the new head</span>
at-head?:bool<span class="Special"> <- </span>equal x, in
<span class="muControl">return-if</span> at-head?, next-node
<span class="Comment"># compute prev-node</span>
prev-node:&:list:_elem<span class="Special"> <- </span>copy in
curr:&:list:_elem<span class="Special"> <- </span>rest prev-node
<span class="Delimiter">{</span>
<span class="muControl">return-unless</span> curr
found?:bool<span class="Special"> <- </span>equal curr, x
<span class="muControl">break-if</span> found?
prev-node<span class="Special"> <- </span>copy curr
curr<span class="Special"> <- </span>rest curr
<span class="Delimiter">}</span>
<span class="Comment"># set its next pointer to skip 'x'</span>
*prev-node<span class="Special"> <- </span>put *prev-node, <span class="Constant">next:offset</span>, next-node
]
<span class="muScenario">scenario</span> removing-from-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
list2:&:list:char<span class="Special"> <- </span>rest list <span class="Comment"># second element</span>
list<span class="Special"> <- </span>remove list2, list
<span class="Constant">10</span>:bool/<span class="Special">raw <- </span>equal list2, <span class="Constant">0</span>
<span class="Comment"># check structure like before</span>
list2<span class="Special"> <- </span>copy list
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">12</span>:char/<span class="Special">raw <- </span>first list2
<span class="Constant">20</span>:&:list:char/<span class="Special">raw <- </span>rest list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># remove returned non-null</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 class="Constant">12</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># no more elements</span>
]
]
<span class="muScenario">scenario</span> removing-from-start-of-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
list<span class="Special"> <- </span>remove list, list
<span class="Comment"># check structure like before</span>
list2:&:list:char<span class="Special"> <- </span>copy list
<span class="Constant">10</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
<span class="Constant">20</span>:&:list:char/<span class="Special">raw <- </span>rest list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">4</span> <span class="Comment"># scanning next, skipping deleted element</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># no more elements</span>
]
]
<span class="muScenario">scenario</span> removing-from-end-of-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">4</span>, list
list<span class="Special"> <- </span>push <span class="Constant">5</span>, list
run [
<span class="Comment"># delete last element</span>
list2:&:list:char<span class="Special"> <- </span>rest list
list2<span class="Special"> <- </span>rest list2
list<span class="Special"> <- </span>remove list2, list
<span class="Constant">10</span>:bool/<span class="Special">raw <- </span>equal list2, <span class="Constant">0</span>
<span class="Comment"># check structure like before</span>
list2<span class="Special"> <- </span>copy list
<span class="Constant">11</span>:char/<span class="Special">raw <- </span>first list2
list2<span class="Special"> <- </span>rest list2
<span class="Constant">12</span>:char/<span class="Special">raw <- </span>first list2
<span class="Constant">20</span>:&:list:char/<span class="Special">raw <- </span>rest list2
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># remove returned non-null</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 class="Constant">12</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">20</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># no more elements</span>
]
]
<span class="muScenario">scenario</span> removing-from-singleton-list [
<span class="Constant">local-scope</span>
list:&:list:char<span class="Special"> <- </span>push <span class="Constant">3</span>, <span class="Constant">0</span>
run [
list<span class="Special"> <- </span>remove list, list
<span class="Constant">1</span>:num/<span class="Special">raw <- </span>copy list
]
memory-should-contain [
<span class="Constant">1</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># back to an empty list</span>
]
]
<span class="Comment"># reverse the elements of a list</span>
<span class="Comment"># (contributed by Caleb Couch)</span>
<span class="muRecipe">def</span> reverse list:&:list:_elem temp:&:list:_elem/contained-in:result<span class="muRecipe"> -> </span>result:&:list:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">reply-unless</span> list, temp
object:_elem<span class="Special"> <- </span>first, list
list<span class="Special"> <- </span>rest list
temp<span class="Special"> <- </span>push object, temp
result<span class="Special"> <- </span>reverse list, temp
]
<span class="muScenario">scenario</span> reverse-list [
<span class="Constant">local-scope</span>
list:&:list:number<span class="Special"> <- </span>push <span class="Constant">1</span>, <span class="Constant">0</span>
list<span class="Special"> <- </span>push <span class="Constant">2</span>, list
list<span class="Special"> <- </span>push <span class="Constant">3</span>, list
run [
stash <span class="Constant">[list:]</span>, list
list<span class="Special"> <- </span>reverse list
stash <span class="Constant">[reversed:]</span>, list
]
trace-should-contain [
app: list: <span class="Constant">3</span><span class="muRecipe"> -> </span><span class="Constant">2</span><span class="muRecipe"> -> </span><span class="Constant">1</span>
app: reversed: <span class="Constant">1</span><span class="muRecipe"> -> </span><span class="Constant">2</span><span class="muRecipe"> -> </span><span class="Constant">3</span>
]
]
<span class="muRecipe">def</span> to-text in:&:list:_elem<span class="muRecipe"> -> </span>result:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
buf:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">80</span>
buf<span class="Special"> <- </span>to-buffer in, buf
result<span class="Special"> <- </span>buffer-to-array buf
]
<span class="Comment"># variant of 'to-text' which stops printing after a few elements (and so is robust to cycles)</span>
<span class="muRecipe">def</span> to-text-line in:&:list:_elem<span class="muRecipe"> -> </span>result:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
buf:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">80</span>
buf<span class="Special"> <- </span>to-buffer in, buf, <span class="Constant">6</span> <span class="Comment"># max elements to display</span>
result<span class="Special"> <- </span>buffer-to-array buf
]
<span class="muRecipe">def</span> to-buffer in:&:list:_elem, buf:&:buffer<span class="muRecipe"> -> </span>buf:&:buffer [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> in
buf<span class="Special"> <- </span>append buf, <span class="Constant">[[]</span>]
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># append in.value to buf</span>
val:_elem<span class="Special"> <- </span>get *in, <span class="Constant">value:offset</span>
buf<span class="Special"> <- </span>append buf, val
<span class="Comment"># now prepare next</span>
next:&:list:_elem<span class="Special"> <- </span>rest in
nextn:num<span class="Special"> <- </span>copy next
<span class="muControl">return-unless</span> next
buf<span class="Special"> <- </span>append buf, <span class="Constant">[ -> ]</span>
<span class="Comment"># and recurse</span>
remaining:num, optional-ingredient-found?:bool<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> optional-ingredient-found?
<span class="Comment"># unlimited recursion</span>
buf<span class="Special"> <- </span>to-buffer next, buf
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> remaining
<span class="Comment"># limited recursion</span>
remaining<span class="Special"> <- </span>subtract remaining, <span class="Constant">1</span>
buf<span class="Special"> <- </span>to-buffer next, buf, remaining
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># past recursion depth; insert ellipses and stop</span>
append buf, <span class="Constant">[...]</span>
]
<span class="muScenario">scenario</span> stash-empty-list [
<span class="Constant">local-scope</span>
x:&:list:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
run [
stash x
]
trace-should-contain [
app: <span class="Constant">[]</span>
]
]
</pre>
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