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<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: So far you can have global variables by not setting default-space, and</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: local variables by setting default-space. You can isolate variables</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: between those extremes by creating 'surrounding' spaces.</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//:</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: (Surrounding spaces are like lexical scopes in other languages.)</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="Delimiter">:(scenario surrounding_space)</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># location 1 in space 1 refers to the space surrounding the default space, here 20.</span>
<span id="L9" class="LineNr"> 9 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L10" class="LineNr">10 </span> <span class="Comment"># pretend address:array:location; in practice we'll use 'new'</span>
<span id="L11" class="LineNr">11 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span id="L12" class="LineNr">12 </span> <span class="Comment"># pretend address:array:location; in practice we'll use 'new"</span>
<span id="L13" class="LineNr">13 </span> <span class="Constant">20</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span id="L14" class="LineNr">14 </span> <span class="Comment"># actual start of this recipe</span>
<span id="L15" class="LineNr">15 </span> <span class="Normal">default</span>-space:space<span class="Special"> <- </span>copy <span class="Constant">10</span>/unsafe
<span id="L16" class="LineNr">16 </span> <span class="Comment">#: later layers will explain the /names: property</span>
<span id="L17" class="LineNr">17 </span> <span class="Constant">0</span>:space/names:dummy<span class="Special"> <- </span>copy <span class="Constant">20</span>/unsafe
<span id="L18" class="LineNr">18 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">32</span>
<span id="L19" class="LineNr">19 </span> <span class="Constant">1</span>:num/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">33</span>
<span id="L20" class="LineNr">20 </span>]
<span id="L21" class="LineNr">21 </span><span class="muRecipe">def</span> dummy [ <span class="Comment"># just for the /names: property above</span>
<span id="L22" class="LineNr">22 </span>]
<span id="L23" class="LineNr">23 </span><span class="Comment"># chain space: 10 + (length) 1</span>
<span id="L24" class="LineNr">24 </span><span class="traceContains">+mem: storing 20 in location 11</span>
<span id="L25" class="LineNr">25 </span><span class="Comment"># store to default space: 10 + (skip length) 1 + (index) 1</span>
<span id="L26" class="LineNr">26 </span><span class="traceContains">+mem: storing 32 in location 12</span>
<span id="L27" class="LineNr">27 </span><span class="Comment"># store to chained space: (contents of location 12) 20 + (length) 1 + (index) 1</span>
<span id="L28" class="LineNr">28 </span><span class="traceContains">+mem: storing 33 in location 22</span>
<span id="L29" class="LineNr">29 </span>
<span id="L30" class="LineNr">30 </span><span class="Comment">//: If you think of a space as a collection of variables with a common</span>
<span id="L31" class="LineNr">31 </span><span class="Comment">//: lifetime, surrounding allows managing shorter lifetimes inside a longer</span>
<span id="L32" class="LineNr">32 </span><span class="Comment">//: one.</span>
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span><span class="Delimiter">:(replace{} "int space_base(const reagent& x)")</span>
<span id="L35" class="LineNr">35 </span><span class="Normal">int</span> <a href='043space.cc.html#L76'>space_base</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L36" class="LineNr">36 </span> <span class="Normal">int</span> base = <a href='026call.cc.html#L83'>current_call</a><span class="Delimiter">().</span>default_space ? <a href='026call.cc.html#L83'>current_call</a><span class="Delimiter">().</span>default_space : <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L37" class="LineNr">37 </span> <span class="Identifier">return</span> <a href='043space.cc.html#L76'>space_base</a><span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index<span class="Delimiter">(</span>x<span class="Delimiter">),</span> base<span class="Delimiter">);</span>
<span id="L38" class="LineNr">38 </span><span class="Delimiter">}</span>
<span id="L39" class="LineNr">39 </span>
<span id="L40" class="LineNr">40 </span><span class="Normal">int</span> <a href='043space.cc.html#L76'>space_base</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">,</span> <span class="Normal">int</span> space_index<span class="Delimiter">,</span> <span class="Normal">int</span> base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr">41 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>space_index == <span class="Constant">0</span><span class="Delimiter">)</span>
<span id="L42" class="LineNr">42 </span> <span class="Identifier">return</span> base<span class="Delimiter">;</span>
<span id="L43" class="LineNr">43 </span> <span class="Identifier">return</span> <a href='043space.cc.html#L76'>space_base</a><span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index-<span class="Constant">1</span><span class="Delimiter">,</span> <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">));</span>
<span id="L44" class="LineNr">44 </span><span class="Delimiter">}</span>
<span id="L45" class="LineNr">45 </span>
<span id="L46" class="LineNr">46 </span><span class="Normal">int</span> space_index<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L47" class="LineNr">47 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L48" class="LineNr">48 </span> <span class="Normal">if</span> <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>
<span id="L49" class="LineNr">49 </span> <span class="Normal">if</span> <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 || 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>right<span class="Delimiter">)</span>
<span id="L50" class="LineNr">50 </span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span><a href='026call.cc.html#L87'>current_recipe_name</a><span class="Delimiter">())</span> << <span class="Constant">"/space metadata should take exactly one value in '"</span> << x<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L51" class="LineNr">51 </span> <span class="Identifier">return</span> to_integer<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>value<span class="Delimiter">);</span>
<span id="L52" class="LineNr">52 </span> <span class="Delimiter">}</span>
<span id="L53" class="LineNr">53 </span> <span class="Delimiter">}</span>
<span id="L54" class="LineNr">54 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L55" class="LineNr">55 </span><span class="Delimiter">}</span>
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span><span class="Delimiter">:(scenario permit_space_as_variable_name)</span>
<span id="L58" class="LineNr">58 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L59" class="LineNr">59 </span> <span class="Normal">space</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L60" class="LineNr">60 </span>]
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