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<span class="Comment">//: Phase 2: Filter loaded recipes through an extensible list of 'transforms'.</span>
<span class="Comment">//:</span>
<span class="Comment">//: The process of running Mu code:</span>
<span class="Comment">//: load -> transform -> run</span>
<span class="Comment">//:</span>
<span class="Comment">//: The hope is that this framework of transform tools will provide a</span>
<span class="Comment">//: deconstructed alternative to conventional compilers.</span>
<span class="Comment">//:</span>
<span class="Comment">//: We're going to have many transforms in Mu, and getting their order right</span>
<span class="Comment">//: (not the same as ordering of layers) is a well-known problem. Some tips:</span>
<span class="Comment">//: a) Design each layer to rely on as few previous layers as possible.</span>
<span class="Comment">//:</span>
<span class="Comment">//: b) When positioning transforms, try to find the tightest constraint in</span>
<span class="Comment">//: each transform relative to previous layers.</span>
<span class="Comment">//:</span>
<span class="Comment">//: c) Even so you'll periodically need to try adjusting each transform</span>
<span class="Comment">//: relative to those in previous layers to find a better arrangement.</span>
<span class="Delimiter">:(before "End recipe Fields")</span>
<span class="Normal">int</span> transformed_until<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End recipe Constructor")</span>
transformed_until = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Types")</span>
<span class="Normal">typedef</span> <span class="Normal">void</span> <span class="Delimiter">(</span>*transform_fn<span class="Delimiter">)(</span><span class="Normal">const</span> recipe_ordinal<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Globals")</span>
vector<transform_fn> Transform<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End One-time Setup")</span>
initialize_transforms<span class="Delimiter">();</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> initialize_transforms<span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span class="Comment">// Begin Transforms</span>
<span class="Comment">// Begin Instruction Inserting/Deleting Transforms</span>
<span class="Comment">// End Instruction Inserting/Deleting Transforms</span>
<span class="Comment">// Begin Instruction Modifying Transforms</span>
<span class="Comment">// End Instruction Modifying Transforms</span>
<span class="Comment">// End Transforms</span>
<span class="Comment">// Begin Checks</span>
<span class="Comment">// End Checks</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> transform_all<span class="Delimiter">()</span> <span class="Delimiter">{</span>
trace<span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"=== transform_all()"</span> << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span> t < SIZE<span class="Delimiter">(</span>Transform<span class="Delimiter">);</span> ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>map<recipe_ordinal<span class="Delimiter">,</span> recipe>::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Recipe<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
recipe& r = p<span class="Delimiter">-></span>second<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>transformed_until != t-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Comment">// End Transform Checks</span>
<span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span><span class="Comment">/*</span><span class="Comment">recipe_ordinal</span><span class="Comment">*/</span>p<span class="Delimiter">-></span>first<span class="Delimiter">);</span>
r<span class="Delimiter">.</span>transformed_until = t<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
parse_int_reagents<span class="Delimiter">();</span> <span class="Comment">// do this after all other transforms have run</span>
<span class="Comment">// End transform_all</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Even though a run will involve many calls to transform_all() for tests,</span>
<span class="Comment">//: our logical model is to load all code, then transform all code, then run.</span>
<span class="Comment">//: If you load new code that should cause already-transformed recipes to</span>
<span class="Comment">//: change, that's not supported. To help detect such situations and raise</span>
<span class="Comment">//: helpful errors we track a count of the number of calls made to</span>
<span class="Comment">//: transform_all().</span>
<span class="Delimiter">:(before "End Globals")</span>
<span class="Normal">int</span> Num_calls_to_transform_all = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "void transform_all()")</span>
++Num_calls_to_transform_all<span class="Delimiter">;</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> parse_int_reagents<span class="Delimiter">()</span> <span class="Delimiter">{</span>
trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- parsing any uninitialized reagents as integers"</span> << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>map<recipe_ordinal<span class="Delimiter">,</span> recipe>::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Recipe<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
recipe& r = p<span class="Delimiter">-></span>second<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span> index < SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
instruction& inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</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 < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
populate_value<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span class="Delimiter">}</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 < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
populate_value<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> populate_value<span class="Delimiter">(</span>reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Comment">// End Reagent-parsing Exceptions</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
r<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>to_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Comment">// helper for tests -- temporarily suppress run</span>
<span class="Normal">void</span> transform<span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
transform_all<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
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