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<span class="Comment">//: So far you can have global variables by not setting default-space, and</span>
<span class="Comment">//: local variables by setting default-space. You can isolate variables</span>
<span class="Comment">//: between those extremes by creating 'surrounding' spaces.</span>
<span class="Comment">//:</span>
<span class="Comment">//: (Surrounding spaces are like lexical scopes in other languages.)</span>
<span class="Delimiter">:(scenario surrounding_space)</span>
<span class="Comment"># location 1 in space 1 refers to the space surrounding the default space, here 20.</span>
recipe main [
<span class="Constant">10</span>:number<span class="Special"> <- </span>copy <span class="Constant">5</span>:literal <span class="Comment"># pretend array</span>
<span class="Constant">20</span>:number<span class="Special"> <- </span>copy <span class="Constant">5</span>:literal <span class="Comment"># pretend array</span>
default-space:address:array:location<span class="Special"> <- </span>copy <span class="Constant">10</span>:literal
<span class="Constant">0</span>:address:array:location/names:dummy<span class="Special"> <- </span>copy <span class="Constant">20</span>:literal <span class="Comment"># later layers will explain the /names: property</span>
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">32</span>:literal
<span class="Constant">1</span>:number/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">33</span>:literal
]
<span class="traceContains">+run: instruction main/3</span>
<span class="traceContains">+mem: storing 20 in location 11</span>
<span class="traceContains">+run: instruction main/4</span>
<span class="traceContains">+mem: storing 32 in location 12</span>
<span class="traceContains">+run: instruction main/5</span>
<span class="traceContains">+mem: storing 33 in location 22</span>
<span class="Comment">//: If you think of a space as a collection of variables with a common</span>
<span class="Comment">//: lifetime, surrounding allows managing shorter lifetimes inside a longer</span>
<span class="Comment">//: one.</span>
<span class="Delimiter">:(replace{} "index_t space_base(const reagent& x)")</span>
index_t space_base<span class="Delimiter">(</span>const reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Identifier">return</span> space_base<span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index<span class="Delimiter">(</span>x<span class="Delimiter">),</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>default_space<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
index_t space_base<span class="Delimiter">(</span>const reagent& x<span class="Delimiter">,</span> index_t space_index<span class="Delimiter">,</span> index_t base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//? trace("foo") << "base of space " << space_index << '\n'; //? 1</span>
if <span class="Delimiter">(</span>space_index == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//? trace("foo") << "base of space " << space_index << " is " << base << '\n'; //? 1</span>
<span class="Identifier">return</span> base<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="CommentedCode">//? trace("foo") << "base of space " << space_index << " is " << Memory[base+1] << '\n'; //? 1</span>
index_t result = space_base<span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index-<span class="Constant">1</span><span class="Delimiter">,</span> Memory[base+<span class="Constant">1</span>]<span class="Delimiter">);</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
index_t space_index<span class="Delimiter">(</span>const reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i < x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">"space"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>size<span class="Delimiter">()</span> == <span class="Constant">1</span><span class="Delimiter">);</span>
<span class="Identifier">return</span> to_number<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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