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<pre id='vimCodeElement'>
<span class="Comment"># new type to help incrementally scan arrays</span>
<span class="muData">container</span> stream:_elem [
index:num
data:&:@:_elem
]
<span class="muRecipe">def</span> new-stream s:&:@:_elem<span class="muRecipe"> -> </span>result:&:stream:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>new <span class="Delimiter">{</span>(stream _elem): type<span class="Delimiter">}</span>
*result<span class="Special"> <- </span>put *result, <span class="Constant">index:offset</span>, <span class="Constant">0</span>
*result<span class="Special"> <- </span>put *result, <span class="Constant">data:offset</span>, s
]
<span class="muRecipe">def</span> rewind in:&:stream:_elem<span class="muRecipe"> -> </span>in:&:stream:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
*in<span class="Special"> <- </span>put *in, <span class="Constant">index:offset</span>, <span class="Constant">0</span>
]
<span class="muRecipe">def</span> read in:&:stream:_elem<span class="muRecipe"> -> </span>result:_elem, empty?:bool, in:&:stream:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
empty?<span class="Special"> <- </span>copy <span class="Constant">0/false</span>
idx:num<span class="Special"> <- </span>get *in, <span class="Constant">index:offset</span>
s:&:@:_elem<span class="Special"> <- </span>get *in, <span class="Constant">data:offset</span>
len:num<span class="Special"> <- </span>length *s
at-end?:bool<span class="Special"> <- </span>greater-or-equal idx len
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> at-end?
empty-result:&:_elem<span class="Special"> <- </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"> <- </span>index *s, idx
idx<span class="Special"> <- </span>add idx, <span class="Constant">1</span>
*in<span class="Special"> <- </span>put *in, <span class="Constant">index:offset</span>, idx
]
<span class="muRecipe">def</span> peek in:&:stream:_elem<span class="muRecipe"> -> </span>result:_elem, empty?:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
empty?:bool<span class="Special"> <- </span>copy <span class="Constant">0/false</span>
idx:num<span class="Special"> <- </span>get *in, <span class="Constant">index:offset</span>
s:&:@:_elem<span class="Special"> <- </span>get *in, <span class="Constant">data:offset</span>
len:num<span class="Special"> <- </span>length *s
at-end?:bool<span class="Special"> <- </span>greater-or-equal idx len
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> at-end?
empty-result:&:_elem<span class="Special"> <- </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"> <- </span>index *s, idx
]
<span class="muRecipe">def</span> read-line in:&:stream:char<span class="muRecipe"> -> </span>result:text, in:&:stream:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
idx:num<span class="Special"> <- </span>get *in, <span class="Constant">index:offset</span>
s:text<span class="Special"> <- </span>get *in, <span class="Constant">data:offset</span>
next-idx:num<span class="Special"> <- </span>find-next s, <span class="Constant">10/newline</span>, idx
result<span class="Special"> <- </span>copy-range s, idx, next-idx
idx<span class="Special"> <- </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"> <- </span>put *in, <span class="Constant">index:offset</span>, idx
]
<span class="muRecipe">def</span> end-of-stream? in:&:stream:_elem<span class="muRecipe"> -> </span>result:bool [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
idx:num<span class="Special"> <- </span>get *in, <span class="Constant">index:offset</span>
s:&:@:_elem<span class="Special"> <- </span>get *in, <span class="Constant">data:offset</span>
len:num<span class="Special"> <- </span>length *s
result<span class="Special"> <- </span>greater-or-equal idx, len
]
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