RosettaCodeData/Task/Closures-Value-capture/Phix/closures-value-capture-1.phix

(phixonline)-->
 <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 <span style="color: #000080;font-style:italic;">-- First some generic handling stuff, handles partial_args
 -- of any mixture of any length and element types.</span>
 <span style="color: #004080;">sequence</span> <span style="color: #000000;">closures</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
 <span style="color: #008080;">function</span> <span style="color: #000000;">add_closure</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">rid</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">partial_args</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">closures</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">closures</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">rid</span><span style="color: #0000FF;">,</span><span style="color: #000000;">partial_args</span><span style="color: #0000FF;">})</span>
     <span style="color: #008080;">return</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">closures</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- (return an integer id)</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #008080;">function</span> <span style="color: #000000;">call_closure</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">id</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">args</span><span style="color: #0000FF;">)</span>
     <span style="color: #0000FF;">{</span><span style="color: #004080;">integer</span> <span style="color: #000000;">rid</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">partial_args</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">closures</span><span style="color: #0000FF;">[</span><span style="color: #000000;">id</span><span style="color: #0000FF;">]</span>
     <span style="color: #008080;">return</span> <span style="color: #7060A8;">call_func</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rid</span><span style="color: #0000FF;">,</span><span style="color: #000000;">partial_args</span><span style="color: #0000FF;">&</span><span style="color: #000000;">args</span><span style="color: #0000FF;">)</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #000080;font-style:italic;">-- The test routine to be made into a closure, or ten
 -- Note that all external references/captured variables must
 -- be passed as arguments, and grouped together on the lhs</span>
 <span style="color: #008080;">function</span> <span style="color: #000000;">square</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">*</span><span style="color: #000000;">i</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #000080;font-style:italic;">-- Create the ten closures as asked for.
 -- Here, cids is just {1,2,3,4,5,6,7,8,9,10}, however ids would be more
 -- useful for a mixed bag of closures, possibly stored all over the shop.
 -- Likewise add_closure could have been a procedure for this demo, but
 -- you would probably want the function in a real-world application.</span>
 <span style="color: #004080;">sequence</span> <span style="color: #000000;">cids</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
 <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">10</span> <span style="color: #008080;">do</span>
 <span style="color: #000080;font-style:italic;">--for i=11 to 20 do -- alternative test</span>
     <span style="color: #000000;">cids</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">add_closure</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">routine_id</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"square"</span><span style="color: #0000FF;">),{</span><span style="color: #000000;">i</span><span style="color: #0000FF;">})</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 <span style="color: #000080;font-style:italic;">-- And finally call em (this loop is blissfully unaware what function
 -- it is actually calling, and what partial_arguments it is passing)</span>
 <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">10</span> <span style="color: #008080;">do</span>
     <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">" %d"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">call_closure</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cids</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],{}))</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<!--