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<span class="Comment">//: Phase 1 of running Mu code: load it from a textual representation.</span>
<span class="Comment">//:</span>
<span class="Comment">//: The process of running Mu code:</span>
<span class="Comment">//: load -> transform -> run</span>
<span class="Delimiter">:(scenarios load)</span> <span class="Comment">// use 'load' instead of 'run' in all scenarios in this layer</span>
<span class="Delimiter">:(scenario first_recipe)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(code)</span>
vector<recipe_ordinal> load<span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
istringstream in<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
in >> std::noskipws<span class="Delimiter">;</span>
<span class="Identifier">return</span> load<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
vector<recipe_ordinal> load<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
in >> std::noskipws<span class="Delimiter">;</span>
vector<recipe_ordinal> result<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
string command = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>command<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// Command Handlers</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">"recipe"</span> || command == <span class="Constant">"def"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
recipe_ordinal r = slurp_recipe<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r > <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">"recipe!"</span> || command == <span class="Constant">"def!"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
Disable_redefine_checks = <span class="Constant">true</span><span class="Delimiter">;</span>
recipe_ordinal r = slurp_recipe<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>r > <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
Disable_redefine_checks = <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// End Command Handlers</span>
<span class="Normal">else</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"unknown top-level command: "</span> << command << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// return the recipe ordinal slurped, or -1 if it failed</span>
<span class="Comment">// (later layers will cause failures)</span>
<span class="Normal">int</span> slurp_recipe<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
recipe result<span class="Delimiter">;</span>
result<span class="Delimiter">.</span>name = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
raise << <span class="Constant">"file ended with 'recipe'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// End Load Recipe Name</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Comment">// End Recipe Refinements</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
raise << <span class="Constant">"empty result.name</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"--- defining "</span> << result<span class="Delimiter">.</span>name << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>Recipe<span class="Delimiter">.</span>find<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span> != Recipe<span class="Delimiter">.</span>end<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">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"already exists"</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>should_check_for_redefine<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
raise << <span class="Constant">"redefining recipe "</span> << result<span class="Delimiter">.</span>name << <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
slurp_body<span class="Delimiter">(</span>in<span class="Delimiter">,</span> result<span class="Delimiter">);</span>
<span class="Comment">// End Recipe Body(result)</span>
put<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">),</span> result<span class="Delimiter">);</span>
<span class="Identifier">return</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> slurp_body<span class="Delimiter">(</span>istream& in<span class="Delimiter">,</span> recipe& result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
in >> std::noskipws<span class="Delimiter">;</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
raise << result<span class="Delimiter">.</span>name << <span class="Constant">": recipe body must begin with '['</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span> <span class="Comment">// permit trailing comment after '['</span>
instruction curr<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>next_instruction<span class="Delimiter">(</span>in<span class="Delimiter">,</span> &curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
curr<span class="Delimiter">.</span>original_string = to_original_string<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span class="Comment">// End Rewrite Instruction(curr, recipe result)</span>
trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">"load"</span><span class="Delimiter">)</span> << <span class="Constant">"after rewriting: "</span> << to_string<span class="Delimiter">(</span>curr<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>is_empty<span class="Delimiter">())</span> result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">bool</span> next_instruction<span class="Delimiter">(</span>istream& in<span class="Delimiter">,</span> instruction* curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
curr<span class="Delimiter">-></span>clear<span class="Delimiter">();</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"incomplete recipe at end of file (0)</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
vector<string> words<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> && in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"incomplete recipe at end of file (1)</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
string word = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>word<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
raise << <span class="Constant">"incomplete recipe at end of file (2)</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
words<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>word<span class="Delimiter">);</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>words<span class="Delimiter">)</span> == <span class="Constant">1</span> && words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">"]"</span><span class="Delimiter">)</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// end of recipe</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>words<span class="Delimiter">)</span> == <span class="Constant">1</span> && is_label_word<span class="Delimiter">(</span>words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
curr<span class="Delimiter">-></span>is_label = <span class="Constant">true</span><span class="Delimiter">;</span>
curr<span class="Delimiter">-></span>label = words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"label: "</span> << curr<span class="Delimiter">-></span>label << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"incomplete recipe at end of file (3)</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
vector<string>::iterator p = words<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>find<span class="Delimiter">(</span>words<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> words<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> <span class="Constant">"<-"</span><span class="Delimiter">)</span> != words<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span class="Normal">for</span> <span class="Delimiter">(;</span> *p != <span class="Constant">"<-"</span><span class="Delimiter">;</span> ++p<span class="Delimiter">)</span>
curr<span class="Delimiter">-></span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
++p<span class="Delimiter">;</span> <span class="Comment">// skip <-</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>p == words<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"instruction prematurely ended with '<-'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
curr<span class="Delimiter">-></span>old_name = curr<span class="Delimiter">-></span>name = *p<span class="Delimiter">;</span> ++p<span class="Delimiter">;</span>
<span class="Comment">// curr->operation will be set in a later layer</span>
<span class="Normal">for</span> <span class="Delimiter">(;</span> p != words<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
curr<span class="Delimiter">-></span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"instruction: "</span> << curr<span class="Delimiter">-></span>name << end<span class="Delimiter">();</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">" number of ingredients: "</span> << SIZE<span class="Delimiter">(</span>curr<span class="Delimiter">-></span>ingredients<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>vector<reagent>::iterator p = curr<span class="Delimiter">-></span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != curr<span class="Delimiter">-></span>ingredients<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">" ingredient: "</span> << to_string<span class="Delimiter">(</span>*p<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>vector<reagent>::iterator p = curr<span class="Delimiter">-></span>products<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != curr<span class="Delimiter">-></span>products<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">" product: "</span> << to_string<span class="Delimiter">(</span>*p<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"9: unbalanced '[' for recipe</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// can return empty string -- only if `in` has no more data</span>
string next_word<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Comment">// End next_word Special-cases</span>
ostringstream out<span class="Delimiter">;</span>
slurp_word<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
skip_whitespace_and_comments_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
string result = out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>result != <span class="Constant">"["</span> && ends_with<span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">'['</span><span class="Delimiter">))</span>
raise << <span class="Constant">"insert a space before '[' in '"</span> << result << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">bool</span> is_label_word<span class="Delimiter">(</span><span class="Normal">const</span> string& word<span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!word<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Identifier">return</span> !isalnum<span class="Delimiter">(</span>word<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> && string<span class="Delimiter">(</span><span class="Constant">"$_*@&,=-"</span><span class="Delimiter">).</span>find<span class="Delimiter">(</span>word<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> == string::npos<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">bool</span> ends_with<span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">char</span> c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Identifier">return</span> *s<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == c<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Globals")</span>
<span class="Comment">// word boundaries</span>
<span class="Normal">extern</span> <span class="Normal">const</span> string Terminators<span class="Delimiter">(</span><span class="Constant">"(){}"</span><span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> slurp_word<span class="Delimiter">(</span>istream& in<span class="Delimiter">,</span> ostream& out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">char</span> c<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> && Terminators<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
in >> c<span class="Delimiter">;</span>
out << c<span class="Delimiter">;</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>in >> c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>c<span class="Delimiter">)</span> || Terminators<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos || Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
out << c<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> skip_whitespace_and_comments<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> skip_comment<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// confusing; move to the next line only to skip a comment, but never otherwise</span>
<span class="Normal">void</span> skip_whitespace_and_comments_but_not_newline<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> skip_comment<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">void</span> skip_comment<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> && in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> && in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario recipe_instead_of_def)</span>
<span class="muRecipe">recipe</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_comment_outside_recipe)</span>
<span class="Comment"># this comment will be dropped by the tangler, so we need a dummy recipe to stop that</span>
<span class="muRecipe">def</span> f1 [
]
<span class="Comment"># this comment will go through to 'load'</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_comment_amongst_instruction)</span>
<span class="muRecipe">def</span> main [
<span class="Comment"># comment</span>
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_comment_amongst_instruction_2)</span>
<span class="muRecipe">def</span> main [
<span class="Comment"># comment</span>
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span class="Comment"># comment</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_comment_amongst_instruction_3)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span class="Comment"># comment</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {2: "number"}</span>
<span class="Delimiter">:(scenario parse_comment_after_instruction)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span> <span class="Comment"># comment</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_label)</span>
<span class="muRecipe">def</span> main [
+foo
]
<span class="traceContains">+parse: label: +foo</span>
<span class="Delimiter">:(scenario parse_dollar_as_recipe_name)</span>
<span class="muRecipe">def</span> main [
$foo
]
<span class="traceContains">+parse: instruction: $foo</span>
<span class="Delimiter">:(scenario parse_multiple_properties)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>/foo:bar:baz
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal", "foo": ("bar" "baz")}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="Delimiter">:(scenario parse_multiple_products)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="traceContains">+parse: product: {2: "number"}</span>
<span class="Delimiter">:(scenario parse_multiple_ingredients)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">4</span>:number
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: ingredient: {4: "number"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="traceContains">+parse: product: {2: "number"}</span>
<span class="Delimiter">:(scenario parse_multiple_types)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:address:number<span class="Special"> <- </span>copy <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">4</span>:number
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse: ingredient: {23: "literal"}</span>
<span class="traceContains">+parse: ingredient: {4: "number"}</span>
<span class="traceContains">+parse: product: {1: "number"}</span>
<span class="traceContains">+parse: product: {2: ("address" "number")}</span>
<span class="Delimiter">:(scenario parse_properties)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:address:number/lookup<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+parse: product: {1: ("address" "number"), "lookup": ()}</span>
<span class="Comment">//: this test we can't represent with a scenario</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> test_parse_comment_terminated_by_eof<span class="Delimiter">()</span> <span class="Delimiter">{</span>
load<span class="Delimiter">(</span><span class="Constant">"recipe main [</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span class="Constant">" a:number <- copy 34</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span class="Constant">"]</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span class="Constant">"# abc"</span><span class="Delimiter">);</span> <span class="Comment">// no newline after comment</span>
cerr << <span class="Constant">"."</span><span class="Delimiter">;</span> <span class="Comment">// termination = success</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario warn_on_missing_space_before_bracket)</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muRecipe">def</span> main[
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+error: insert a space before '[' in 'main['</span>
<span class="Comment">//: Warn if a recipe gets redefined, because large codebases can accidentally</span>
<span class="Comment">//: step on their own toes. But there'll be many occasions later where</span>
<span class="Comment">//: we'll want to disable the errors.</span>
<span class="Delimiter">:(before "End Globals")</span>
<span class="Normal">bool</span> Disable_redefine_checks = <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Setup")</span>
Disable_redefine_checks = <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">bool</span> should_check_for_redefine<span class="Delimiter">(</span><span class="Normal">const</span> string& recipe_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>Disable_redefine_checks<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario forbid_redefining_recipes)</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">24</span>
]
<span class="traceContains">+error: redefining recipe main</span>
<span class="Delimiter">:(scenario permit_forcibly_redefining_recipes)</span>
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">23</span>
]
<span class="muRecipe">def</span>! main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">24</span>
]
<span class="traceAbsent">-error: redefining recipe main</span>
$error: <span class="Constant">0</span>
<span class="Delimiter">:(code)</span>
<span class="Comment">// for debugging</span>
<span class="Normal">void</span> show_rest_of_stream<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
cerr << <span class="Constant">'^'</span><span class="Delimiter">;</span>
<span class="Normal">char</span> c<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>in >> c<span class="Delimiter">)</span>
cerr << c<span class="Delimiter">;</span>
cerr << <span class="Constant">"$</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
</pre>
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