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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around file system primitives that take a 'resources' object and</span>
<span class="Comment"># are thus easier to test.</span>
<span class="muData">container</span> resources [
lock:bool
data:&:@:resource
]
<span class="muData">container</span> resource [
name:text
contents:text
]
<span class="muRecipe">def</span> start-reading resources:&:resources, filename:text<span class="muRecipe"> -> </span>contents:&:source:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> resources
<span class="Comment"># fake file system</span>
contents <span class="Special"><-</span> start-reading-from-fake-resources resources, filename
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># real file system</span>
file:num <span class="Special"><-</span> $open-file-for-reading filename
assert file, <span class="Constant">[file not found]</span>
contents:&:source:char, sink:&:sink:char <span class="Special"><-</span> new-channel<span class="Constant"> 30</span>
start-running receive-from-file file, sink
]
<span class="muRecipe">def</span> start-reading-from-fake-resources resources:&:resources, resource:text<span class="muRecipe"> -> </span>contents:&:source:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
i:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
data:&:@:resource <span class="Special"><-</span> get *resources, <span class="Constant">data:offset</span>
len:num <span class="Special"><-</span> length *data
<span class="Delimiter">{</span>
done?:bool <span class="Special"><-</span> greater-or-equal i, len
<span class="muControl">break-if</span> done?
tmp:resource <span class="Special"><-</span> index *data, i
i <span class="Special"><-</span> add i,<span class="Constant"> 1</span>
curr-resource:text <span class="Special"><-</span> get tmp, <span class="Constant">name:offset</span>
found?:bool <span class="Special"><-</span> equal resource, curr-resource
<span class="muControl">loop-unless</span> found?
contents:&:source:char, sink:&:sink:char <span class="Special"><-</span> new-channel<span class="Constant"> 30</span>
curr-contents:text <span class="Special"><-</span> get tmp, <span class="Constant">contents:offset</span>
start-running receive-from-text curr-contents, sink
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="muControl">return</span> <span class="Constant">0/not-found</span>
]
<span class="muRecipe">def</span> receive-from-file file:num, sink:&:sink:char<span class="muRecipe"> -> </span>sink:&:sink:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
c:char, eof?:bool <span class="Special"><-</span> $read-from-file file
<span class="muControl">break-if</span> eof?
sink <span class="Special"><-</span> write sink, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
sink <span class="Special"><-</span> close sink
file <span class="Special"><-</span> $close-file file
]
<span class="muRecipe">def</span> receive-from-text contents:text, sink:&:sink:char<span class="muRecipe"> -> </span>sink:&:sink:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
i:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
len:num <span class="Special"><-</span> length *contents
<span class="Delimiter">{</span>
done?:bool <span class="Special"><-</span> greater-or-equal i, len
<span class="muControl">break-if</span> done?
c:char <span class="Special"><-</span> index *contents, i
sink <span class="Special"><-</span> write sink, c
i <span class="Special"><-</span> add i,<span class="Constant"> 1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
sink <span class="Special"><-</span> close sink
]
<span class="muRecipe">def</span> start-writing resources:&:resources, filename:text<span class="muRecipe"> -> </span>sink:&:sink:char, routine-id:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
source:&:source:char, sink:&:sink:char <span class="Special"><-</span> new-channel<span class="Constant"> 30</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> resources
<span class="Comment"># fake file system</span>
routine-id <span class="Special"><-</span> start-running transmit-to-fake-file resources, filename, source
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># real file system</span>
file:num <span class="Special"><-</span> $open-file-for-writing filename
assert file, <span class="Constant">[no such file]</span>
routine-id <span class="Special"><-</span> start-running transmit-to-file file, source
]
<span class="muRecipe">def</span> transmit-to-file file:num, source:&:source:char<span class="muRecipe"> -> </span>source:&:source:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
c:char, done?:bool, source <span class="Special"><-</span> read source
<span class="muControl">break-if</span> done?
$write-to-file file, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
file <span class="Special"><-</span> $close-file file
]
<span class="muRecipe">def</span> transmit-to-fake-file resources:&:resources, filename:text, source:&:source:char<span class="muRecipe"> -> </span>resources:&:resources, source:&:source:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
lock:location <span class="Special"><-</span> get-location *resources, <span class="Constant">lock:offset</span>
wait-for-reset-then-set lock
<span class="Comment"># compute new file contents</span>
buf:&:buffer <span class="Special"><-</span> new-buffer<span class="Constant"> 30</span>
<span class="Delimiter">{</span>
c:char, done?:bool, source <span class="Special"><-</span> read source
<span class="muControl">break-if</span> done?
buf <span class="Special"><-</span> append buf, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
contents:text <span class="Special"><-</span> buffer-to-array buf
new-resource:resource <span class="Special"><-</span> merge filename, contents
<span class="Comment"># write to resources</span>
curr-filename:text <span class="Special"><-</span> copy<span class="Constant"> 0</span>
data:&:@:resource <span class="Special"><-</span> get *resources, <span class="Constant">data:offset</span>
<span class="Comment"># replace file contents if it already exists</span>
i:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
len:num <span class="Special"><-</span> length *data
<span class="Delimiter">{</span>
done?:bool <span class="Special"><-</span> greater-or-equal i, len
<span class="muControl">break-if</span> done?
tmp:resource <span class="Special"><-</span> index *data, i
curr-filename <span class="Special"><-</span> get tmp, <span class="Constant">name:offset</span>
found?:bool <span class="Special"><-</span> equal filename, curr-filename
<span class="muControl">loop-unless</span> found?
put-index *data, i, new-resource
reset lock
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># if file didn't already exist, make room for it</span>
new-len:num <span class="Special"><-</span> add len,<span class="Constant"> 1</span>
new-data:&:@:resource <span class="Special"><-</span> new <span class="Constant">resource:type</span>, new-len
put *resources, <span class="Constant">data:offset</span>, new-data
<span class="Comment"># copy over old files</span>
i:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
done?:bool <span class="Special"><-</span> greater-or-equal i, len
<span class="muControl">break-if</span> done?
tmp:resource <span class="Special"><-</span> index *data, i
put-index *new-data, i, tmp
<span class="Delimiter">}</span>
<span class="Comment"># write new file</span>
put-index *new-data, len, new-resource
reset lock
]
</pre>
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