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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around file system primitives that take a 'filesystem' object and</span>
<span class="Comment"># are thus easier to test.</span>
<span class="muData">container</span> filesystem [
data:&:@:file-mapping
]
<span class="muData">container</span> file-mapping [
name:text
contents:text
]
<span class="muRecipe">def</span> start-reading fs:&:filesystem, 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-if</span> fs
<span class="Comment"># real file system</span>
file:num<span class="Special"> <- </span>$open-file-for-reading filename
assert file, <span class="Constant">[file not found]</span>
contents:&:source:char, sink:&:sink:char<span class="Special"> <- </span>new-channel <span class="Constant">30</span>
start-running transmit-from-file file, sink
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="Comment"># fake file system</span>
i:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
data:&:@:file-mapping<span class="Special"> <- </span>get *fs, <span class="Constant">data:offset</span>
len:num<span class="Special"> <- </span>length *data
<span class="Delimiter">{</span>
done?:bool<span class="Special"> <- </span>greater-or-equal i, len
<span class="muControl">break-if</span> done?
tmp:file-mapping<span class="Special"> <- </span>index *data, i
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
curr-filename:text<span class="Special"> <- </span>get tmp, <span class="Constant">name:offset</span>
found?:bool<span class="Special"> <- </span>equal filename, curr-filename
<span class="muControl">loop-unless</span> found?
contents:&:source:char, sink:&:sink:char<span class="Special"> <- </span>new-channel <span class="Constant">30</span>
curr-contents:text<span class="Special"> <- </span>get tmp, <span class="Constant">contents:offset</span>
start-running transmit-from-text curr-contents, sink
<span class="muControl">return</span>
<span class="Delimiter">}</span>
<span class="muControl">return</span> <span class="Constant">0/not-found</span>
]
<span class="muRecipe">def</span> transmit-from-file file:num, sink:&:sink:char<span class="muRecipe"> -> </span>sink:&:sink:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
c:char, eof?:bool<span class="Special"> <- </span>$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>$close-file file
]
<span class="muRecipe">def</span> transmit-from-text contents:text, sink:&:sink:char<span class="muRecipe"> -> </span>sink:&:sink:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
i:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
len:num<span class="Special"> <- </span>length *contents
<span class="Delimiter">{</span>
done?:bool<span class="Special"> <- </span>greater-or-equal i, len
<span class="muControl">break-if</span> done?
c:char<span class="Special"> <- </span>index *contents, i
sink<span class="Special"> <- </span>write sink, c
i<span class="Special"> <- </span>add i, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
sink<span class="Special"> <- </span>close sink
]
<span class="muRecipe">def</span> start-writing fs:&:filesystem, filename:text<span class="muRecipe"> -> </span>sink:&:sink:char, routine-id:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
source:&:source:char, sink:&:sink:char<span class="Special"> <- </span>new-channel <span class="Constant">30</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> fs
<span class="Comment"># real file system</span>
file:num<span class="Special"> <- </span>$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="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># fake file system</span>
<span class="Comment"># beware: doesn't support multiple concurrent writes yet</span>
routine-id<span class="Special"> <- </span>start-running transmit-to-fake-file fs, filename, 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 fs:&:filesystem, filename:text, source:&:source:char<span class="muRecipe"> -> </span>fs:&:filesystem, source:&:source:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<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-file-mapping:file-mapping<span class="Special"> <- </span>merge filename, contents
<span class="Comment"># write to filesystem</span>
curr-filename:text<span class="Special"> <- </span>copy <span class="Constant">0</span>
data:&:@:file-mapping<span class="Special"> <- </span>get *fs, <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:file-mapping<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-file-mapping
<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:&:@:file-mapping<span class="Special"> <- </span>new <span class="Constant">file-mapping:type</span>, new-len
put *fs, <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:file-mapping<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-file-mapping
]
</pre>
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