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<a href='https://github.com/akkartik/mu/blob/master/016dilated_reagent.cc'>https://github.com/akkartik/mu/blob/master/016dilated_reagent.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: An alternative syntax for reagents that permits whitespace in properties,</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: grouped by brackets. We'll use this ability in the next layer, when we</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: generalize types from lists to trees of properties.</span>
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="Delimiter">:(scenarios load)</span>
<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(scenario dilated_reagent)</span>
<span id="L7" class="LineNr"> 7 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L8" class="LineNr"> 8 </span> <span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L9" class="LineNr"> 9 </span>]
<span id="L10" class="LineNr"> 10 </span><span class="traceContains">+parse: product: {1: "number", "foo": "bar"}</span>
<span id="L11" class="LineNr"> 11 </span>
<span id="L12" class="LineNr"> 12 </span><span class="Delimiter">:(scenario load_trailing_space_after_curly_bracket)</span>
<span id="L13" class="LineNr"> 13 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L14" class="LineNr"> 14 </span> <span class="Comment"># line below has a space at the end</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Delimiter">{</span><span class="Error"> </span>
<span id="L16" class="LineNr"> 16 </span>]
<span id="L17" class="LineNr"> 17 </span><span class="Comment"># successfully parsed</span>
<span id="L18" class="LineNr"> 18 </span>
<span id="L19" class="LineNr"> 19 </span><span class="Delimiter">:(scenario dilated_reagent_with_comment)</span>
<span id="L20" class="LineNr"> 20 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L21" class="LineNr"> 21 </span> <span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># test comment</span>
<span id="L22" class="LineNr"> 22 </span>]
<span id="L23" class="LineNr"> 23 </span><span class="traceContains">+parse: product: {1: "number", "foo": "bar"}</span>
<span id="L24" class="LineNr"> 24 </span>$error: <span class="Constant">0</span>
<span id="L25" class="LineNr"> 25 </span>
<span id="L26" class="LineNr"> 26 </span><span class="Delimiter">:(scenario dilated_reagent_with_comment_immediately_following)</span>
<span id="L27" class="LineNr"> 27 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L28" class="LineNr"> 28 </span> <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Delimiter">{</span><span class="Constant">34</span>: literal<span class="Delimiter">}</span> <span class="Comment"># test comment</span>
<span id="L29" class="LineNr"> 29 </span>]
<span id="L30" class="LineNr"> 30 </span>$error: <span class="Constant">0</span>
<span id="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="Comment">//: First augment next_word to group balanced brackets together.</span>
<span id="L33" class="LineNr"> 33 </span>
<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">:(before "End <a href='011load.cc.html#L169'>next_word</a> Special-cases")</span>
<span id="L35" class="LineNr"> 35 </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>
<span id="L36" class="LineNr"> 36 </span> <span class="Identifier">return</span> <a href='016dilated_reagent.cc.html#L57'>slurp_balanced_bracket</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L37" class="LineNr"> 37 </span><span class="Comment">// treat curlies mostly like parens, but don't mess up labels</span>
<span id="L38" class="LineNr"> 38 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='016dilated_reagent.cc.html#L44'>start_of_dilated_reagent</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Identifier">return</span> <a href='016dilated_reagent.cc.html#L57'>slurp_balanced_bracket</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L40" class="LineNr"> 40 </span>
<span id="L41" class="LineNr"> 41 </span><span class="Delimiter">:(code)</span>
<span id="L42" class="LineNr"> 42 </span><span class="Comment">// A curly is considered a label if it's the last thing on a line. Dilated</span>
<span id="L43" class="LineNr"> 43 </span><span class="Comment">// reagents should remain all on one line.</span>
<span id="L44" class="LineNr"> 44 </span><span class="Normal">bool</span> <a href='016dilated_reagent.cc.html#L44'>start_of_dilated_reagent</a><span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </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> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Normal">int</span> pos = in<span class="Delimiter">.</span>tellg<span class="Delimiter">();</span>
<span id="L47" class="LineNr"> 47 </span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span> <span class="Comment">// slurp '{'</span>
<span id="L48" class="LineNr"> 48 </span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Normal">char</span> next = in<span class="Delimiter">.</span>peek<span class="Delimiter">();</span>
<span id="L50" class="LineNr"> 50 </span> in<span class="Delimiter">.</span>seekg<span class="Delimiter">(</span>pos<span class="Delimiter">);</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Identifier">return</span> next != <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L52" class="LineNr"> 52 </span><span class="Delimiter">}</span>
<span id="L53" class="LineNr"> 53 </span>
<span id="L54" class="LineNr"> 54 </span><span class="Comment">// Assume the first letter is an open bracket, and read everything until the</span>
<span id="L55" class="LineNr"> 55 </span><span class="Comment">// matching close bracket.</span>
<span id="L56" class="LineNr"> 56 </span><span class="Comment">// We balance {} () and [].</span>
<span id="L57" class="LineNr"> 57 </span>string <a href='016dilated_reagent.cc.html#L57'>slurp_balanced_bracket</a><span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L58" class="LineNr"> 58 </span> ostringstream result<span class="Delimiter">;</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Normal">char</span> c<span class="Delimiter">;</span>
<span id="L60" class="LineNr"> 60 </span> list<<span class="Normal">char</span>> open_brackets<span class="Delimiter">;</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>in >> c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'('</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L65" class="LineNr"> 65 </span> <a href='003trace.cc.html#L196'>raise</a> << <span class="Constant">"unbalanced ')'\n"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span> assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">);</span>
<span id="L69" class="LineNr"> 69 </span> open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Delimiter">}</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>