html/014literal_string.cc.html


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<span id="L1" class="LineNr">  1 </span><span class="Comment">//: For convenience, some instructions will take literal arrays of characters</span>
<span id="L2" class="LineNr">  2 </span><span class="Comment">//: (text or strings).</span>
<span id="L3" class="LineNr">  3 </span><span class="Comment">//:</span>
<span id="L4" class="LineNr">  4 </span><span class="Comment">//: Instead of quotes, we'll use [] to delimit strings. That'll reduce the</span>
<span id="L5" class="LineNr">  5 </span><span class="Comment">//: need for escaping since we can support nested brackets. And we can also</span>
<span id="L6" class="LineNr">  6 </span><span class="Comment">//: imagine that 'recipe' might one day itself be defined in Mu, doing its own</span>
<span id="L7" class="LineNr">  7 </span><span class="Comment">//: parsing.</span>
<span id="L8" class="LineNr">  8 </span>
<span id="L9" class="LineNr">  9 </span><span class="Delimiter">:(scenarios load)</span>
<span id="L10" class="LineNr"> 10 </span><span class="Delimiter">:(scenario string_literal)</span>
<span id="L11" class="LineNr"> 11 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L12" class="LineNr"> 12 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [abc def]
<span id="L13" class="LineNr"> 13 </span>]
<span id="L14" class="LineNr"> 14 </span><span class="traceContains">+parse:   ingredient: {&quot;abc def&quot;: &quot;literal-string&quot;}</span>
<span id="L15" class="LineNr"> 15 </span>
<span id="L16" class="LineNr"> 16 </span><span class="Delimiter">:(scenario string_literal_with_colons)</span>
<span id="L17" class="LineNr"> 17 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L18" class="LineNr"> 18 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [abc:def/ghi]
<span id="L19" class="LineNr"> 19 </span>]
<span id="L20" class="LineNr"> 20 </span><span class="traceContains">+parse:   ingredient: {&quot;abc:def/ghi&quot;: &quot;literal-string&quot;}</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
<span id="L23" class="LineNr"> 23 </span><a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L24" class="LineNr"> 24 </span>
<span id="L25" class="LineNr"> 25 </span><span class="Delimiter">:(before &quot;End <a href='011load.cc.html#L169'>next_word</a> Special-cases&quot;)</span>
<span id="L26" class="LineNr"> 26 </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="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span>  string result = <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L28" class="LineNr"> 28 </span>  <a href='011load.cc.html#L222'>skip_whitespace_and_comments_but_not_newline</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L29" class="LineNr"> 29 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">}</span>
<span id="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(code)</span>
<span id="L33" class="LineNr"> 33 </span>string <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L34" class="LineNr"> 34 </span>  ostringstream out<span class="Delimiter">;</span>
<span id="L35" class="LineNr"> 35 </span>  assert<span class="Delimiter">(</span><a href='001help.cc.html#L239'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">));</span>  assert<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>  out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>  <span class="Comment">// slurp the '['</span>
<span id="L36" class="LineNr"> 36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L45'>is_code_string</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">))</span>
<span id="L37" class="LineNr"> 37 </span>    <a href='014literal_string.cc.html#L82'>slurp_quoted_comment_aware</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span>  <span class="Normal">else</span>
<span id="L39" class="LineNr"> 39 </span>    <a href='014literal_string.cc.html#L62'>slurp_quoted_comment_oblivious</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
<span id="L40" class="LineNr"> 40 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L41" class="LineNr"> 41 </span><span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span>
<span id="L43" class="LineNr"> 43 </span><span class="Comment">// A string is a code string (ignores comments when scanning for matching</span>
<span id="L44" class="LineNr"> 44 </span><span class="Comment">// brackets) if it contains a newline at the start before any non-whitespace.</span>
<span id="L45" class="LineNr"> 45 </span><span class="Normal">bool</span> <a href='014literal_string.cc.html#L45'>is_code_string</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L46" class="LineNr"> 46 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L239'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L47" class="LineNr"> 47 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!isspace<span class="Delimiter">(</span>c<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L49" class="LineNr"> 49 </span>      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span id="L50" class="LineNr"> 50 </span>      <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L51" class="LineNr"> 51 </span>    <span class="Delimiter">}</span>
<span id="L52" class="LineNr"> 52 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
<span id="L53" class="LineNr"> 53 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L54" class="LineNr"> 54 </span>      <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L55" class="LineNr"> 55 </span>    <span class="Delimiter">}</span>
<span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span>  <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
<span id="L59" class="LineNr"> 59 </span>
<span id="L60" class="LineNr"> 60 </span><span class="Comment">// Read a regular string. Regular strings can only contain other regular</span>
<span id="L61" class="LineNr"> 61 </span><span class="Comment">// strings.</span>
<span id="L62" class="LineNr"> 62 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L62'>slurp_quoted_comment_oblivious</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L63" class="LineNr"> 63 </span>  <span class="Normal">int</span> brace_depth = <span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L64" class="LineNr"> 64 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L239'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L65" class="LineNr"> 65 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span id="L66" class="LineNr"> 66 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L67" class="LineNr"> 67 </span>      <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
<span id="L68" class="LineNr"> 68 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L69" class="LineNr"> 69 </span>    <span class="Delimiter">}</span>
<span id="L70" class="LineNr"> 70 </span>    out &lt;&lt; c<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> ++brace_depth<span class="Delimiter">;</span>
<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> --brace_depth<span class="Delimiter">;</span>
<span id="L73" class="LineNr"> 73 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>brace_depth == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L74" class="LineNr"> 74 </span>  <span class="Delimiter">}</span>
<span id="L75" class="LineNr"> 75 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; brace_depth &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L76" class="LineNr"> 76 </span>    <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L77" class="LineNr"> 77 </span>    out<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
<span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
<span id="L79" class="LineNr"> 79 </span><span class="Delimiter">}</span>
<span id="L80" class="LineNr"> 80 </span>
<span id="L81" class="LineNr"> 81 </span><span class="Comment">// Read a code string. Code strings can contain either code or regular strings.</span>
<span id="L82" class="LineNr"> 82 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L82'>slurp_quoted_comment_aware</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L83" class="LineNr"> 83 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
<span id="L84" class="LineNr"> 84 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L85" class="LineNr"> 85 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L86" class="LineNr"> 86 </span>      <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
<span id="L87" class="LineNr"> 87 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span>    <span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </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="L90" class="LineNr"> 90 </span>      out &lt;&lt; c<span class="Delimiter">;</span>
<span id="L91" class="LineNr"> 91 </span>      <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L239'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
<span id="L92" class="LineNr"> 92 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L93" class="LineNr"> 93 </span>    <span class="Delimiter">}</span>
<span id="L94" class="LineNr"> 94 </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="L95" class="LineNr"> 95 </span>      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span id="L96" class="LineNr"> 96 </span>      <span class="Comment">// recurse</span>
<span id="L97" class="LineNr"> 97 </span>      out &lt;&lt; <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span id="L98" class="LineNr"> 98 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L99" class="LineNr"> 99 </span>    <span class="Delimiter">}</span>
<span id="L100" class="LineNr">100 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
<span id="L101" class="LineNr">101 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
<span id="L103" class="LineNr">103 </span>  <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L104" class="LineNr">104 </span>  out<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
<span id="L105" class="LineNr">105 </span><span class="Delimiter">}</span>
<span id="L106" class="LineNr">106 </span>
<span id="L107" class="LineNr">107 </span><span class="Delimiter">:(after &quot;Parsing reagent(string s)&quot;)</span>
<span id="L108" class="LineNr">108 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L77'>starts_with</a><span class="Delimiter">(</span>s<span class="Delimiter">,</span> <span class="Constant">&quot;[&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L109" class="LineNr">109 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>*s<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// unbalanced bracket; handled elsewhere</span>
<span id="L110" class="LineNr">110 </span>  name = s<span class="Delimiter">;</span>
<span id="L111" class="LineNr">111 </span>  <span class="Comment">// delete [] delimiters</span>
<span id="L112" class="LineNr">112 </span>  name<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L113" class="LineNr">113 </span>  <a href='014literal_string.cc.html#L144'>strip_last</a><span class="Delimiter">(</span>name<span class="Delimiter">);</span>
<span id="L114" class="LineNr">114 </span>  type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L115" class="LineNr">115 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L116" class="LineNr">116 </span><span class="Delimiter">}</span>
<span id="L117" class="LineNr">117 </span>
<span id="L118" class="LineNr">118 </span><span class="Comment">//: Unlike other reagents, escape newlines in literal strings to make them</span>
<span id="L119" class="LineNr">119 </span><span class="Comment">//: more friendly to trace().</span>
<span id="L120" class="LineNr">120 </span>
<span id="L121" class="LineNr">121 </span><span class="Delimiter">:(after &quot;string to_string(const reagent&amp; r)&quot;)</span>
<span id="L122" class="LineNr">122 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>r<span class="Delimiter">))</span>
<span id="L123" class="LineNr">123 </span>    <span class="Identifier">return</span> <a href='014literal_string.cc.html#L130'>emit_literal_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
<span id="L124" class="LineNr">124 </span>
<span id="L125" class="LineNr">125 </span><span class="Delimiter">:(code)</span>
<span id="L126" class="LineNr">126 </span><span class="Normal">bool</span> <a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L127" class="LineNr">127 </span>  <span class="Identifier">return</span> x<span class="Delimiter">.</span>type &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
<span id="L128" class="LineNr">128 </span><span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span>
<span id="L130" class="LineNr">130 </span>string <a href='014literal_string.cc.html#L130'>emit_literal_string</a><span class="Delimiter">(</span>string name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L131" class="LineNr">131 </span>  <span class="Normal">size_t</span> pos = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L132" class="LineNr">132 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>pos != string::npos<span class="Delimiter">)</span>
<span id="L133" class="LineNr">133 </span>    pos = <a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\\</span><span class="Constant">n&quot;</span><span class="Delimiter">,</span> pos<span class="Delimiter">);</span>
<span id="L134" class="LineNr">134 </span>  <span class="Identifier">return</span> <span class="Constant">&quot;{</span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span>+name+<span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">: </span><span class="cSpecial">\&quot;</span><span class="Constant">literal-string</span><span class="cSpecial">\&quot;</span><span class="Constant">}&quot;</span><span class="Delimiter">;</span>
<span id="L135" class="LineNr">135 </span><span class="Delimiter">}</span>
<span id="L136" class="LineNr">136 </span>
<span id="L137" class="LineNr">137 </span><span class="Normal">size_t</span> <a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>string&amp; str<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; from<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; to<span class="Delimiter">,</span> <span class="Normal">size_t</span> n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L138" class="LineNr">138 </span>  <span class="Normal">size_t</span> result = str<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">,</span> n<span class="Delimiter">);</span>
<span id="L139" class="LineNr">139 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result != string::npos<span class="Delimiter">)</span>
<span id="L140" class="LineNr">140 </span>    str<span class="Delimiter">.</span><a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> from<span class="Delimiter">.</span>length<span class="Delimiter">(),</span> to<span class="Delimiter">);</span>
<span id="L141" class="LineNr">141 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L142" class="LineNr">142 </span><span class="Delimiter">}</span>
<span id="L143" class="LineNr">143 </span>
<span id="L144" class="LineNr">144 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L144'>strip_last</a><span class="Delimiter">(</span>string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L145" class="LineNr">145 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> s<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L146" class="LineNr">146 </span><span class="Delimiter">}</span>
<span id="L147" class="LineNr">147 </span>
<span id="L148" class="LineNr">148 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L149" class="LineNr">149 </span>  <span class="Comment">// When you encounter a backslash, strip it out and pass through any</span>
<span id="L150" class="LineNr">150 </span>  <span class="Comment">// following run of backslashes. If we 'escaped' a single following</span>
<span id="L151" class="LineNr">151 </span>  <span class="Comment">// character, then the character '\' would be:</span>
<span id="L152" class="LineNr">152 </span>  <span class="Comment">//   '\\' escaped once</span>
<span id="L153" class="LineNr">153 </span>  <span class="Comment">//   '\\\\' escaped twice</span>
<span id="L154" class="LineNr">154 </span>  <span class="Comment">//   '\\\\\\\\' escaped thrice (8 backslashes)</span>
<span id="L155" class="LineNr">155 </span>  <span class="Comment">// ..and so on. With our approach it'll be:</span>
<span id="L156" class="LineNr">156 </span>  <span class="Comment">//   '\\' escaped once</span>
<span id="L157" class="LineNr">157 </span>  <span class="Comment">//   '\\\' escaped twice</span>
<span id="L158" class="LineNr">158 </span>  <span class="Comment">//   '\\\\' escaped thrice</span>
<span id="L159" class="LineNr">159 </span>  <span class="Comment">// This only works as long as backslashes aren't also overloaded to create</span>
<span id="L160" class="LineNr">160 </span>  <span class="Comment">// special characters. So Mu doesn't follow C's approach of overloading</span>
<span id="L161" class="LineNr">161 </span>  <span class="Comment">// backslashes both to escape quote characters and also as a notation for</span>
<span id="L162" class="LineNr">162 </span>  <span class="Comment">// unprintable characters like '\n'.</span>
<span id="L163" class="LineNr">163 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L239'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L164" class="LineNr">164 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span id="L165" class="LineNr">165 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
<span id="L166" class="LineNr">166 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c != <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L167" class="LineNr">167 </span>  <span class="Delimiter">}</span>
<span id="L168" class="LineNr">168 </span><span class="Delimiter">}</span>
<span id="L169" class="LineNr">169 </span>
<span id="L170" class="LineNr">170 </span><span class="Delimiter">:(scenario string_literal_nested)</span>
<span id="L171" class="LineNr">171 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L172" class="LineNr">172 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [abc [def]]
<span id="L173" class="LineNr">173 </span>]
<span id="L174" class="LineNr">174 </span><span class="traceContains">+parse:   ingredient: {&quot;abc [def]&quot;: &quot;literal-string&quot;}</span>
<span id="L175" class="LineNr">175 </span>
<span id="L176" class="LineNr">176 </span><span class="Delimiter">:(scenario string_literal_escaped)</span>
<span id="L177" class="LineNr">177 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L178" class="LineNr">178 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [abc \[def]
<span id="L179" class="LineNr">179 </span>]
<span id="L180" class="LineNr">180 </span><span class="traceContains">+parse:   ingredient: {&quot;abc [def&quot;: &quot;literal-string&quot;}</span>
<span id="L181" class="LineNr">181 </span>
<span id="L182" class="LineNr">182 </span><span class="Delimiter">:(scenario string_literal_escaped_twice)</span>
<span id="L183" class="LineNr">183 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L184" class="LineNr">184 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [
<span id="L185" class="LineNr">185 </span>abc \\[def]
<span id="L186" class="LineNr">186 </span>]
<span id="L187" class="LineNr">187 </span><span class="traceContains">+parse:   ingredient: {&quot;\nabc \[def&quot;: &quot;literal-string&quot;}</span>
<span id="L188" class="LineNr">188 </span>
<span id="L189" class="LineNr">189 </span><span class="Delimiter">:(scenario string_literal_and_comment)</span>
<span id="L190" class="LineNr">190 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L191" class="LineNr">191 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L101'>address</a>:array:character<span class="Special"> &lt;- </span>copy [abc]  <span class="Comment"># comment</span>
<span id="L192" class="LineNr">192 </span>]
<span id="L193" class="LineNr">193 </span><span class="traceContains">+parse: --- defining <a href='000organization.cc.html#L113'>main</a></span>
<span id="L194" class="LineNr">194 </span><span class="traceContains">+parse: <a href='010vm.cc.html#L33'>instruction</a>: copy</span>
<span id="L195" class="LineNr">195 </span><span class="traceContains">+parse:   number of ingredients: 1</span>
<span id="L196" class="LineNr">196 </span><span class="traceContains">+parse:   ingredient: {&quot;abc&quot;: &quot;literal-string&quot;}</span>
<span id="L197" class="LineNr">197 </span><span class="traceContains">+parse:   product: {1: (&quot;address&quot; &quot;array&quot; &quot;character&quot;)}</span>
<span id="L198" class="LineNr">198 </span>
<span id="L199" class="LineNr">199 </span><span class="Delimiter">:(scenario string_literal_escapes_newlines_in_trace)</span>
<span id="L200" class="LineNr">200 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L201" class="LineNr">201 </span>  copy [abc
<span id="L202" class="LineNr">202 </span><span class="muRecipe">def</span>]
<span id="L203" class="LineNr">203 </span>]
<span id="L204" class="LineNr">204 </span><span class="traceContains">+parse:   ingredient: {&quot;abc\ndef&quot;: &quot;literal-string&quot;}</span>
<span id="L205" class="LineNr">205 </span>
<span id="L206" class="LineNr">206 </span><span class="Delimiter">:(scenario string_literal_can_skip_past_comments)</span>
<span id="L207" class="LineNr">207 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L208" class="LineNr">208 </span>  copy [
<span id="L209" class="LineNr">209 </span>    <span class="Comment"># ']' inside comment</span>
<span id="L210" class="LineNr">210 </span>    bar
<span id="L211" class="LineNr">211 </span>  ]
<span id="L212" class="LineNr">212 </span>]
<span id="L213" class="LineNr">213 </span><span class="traceContains">+parse:   ingredient: {&quot;\n    # ']' inside comment\n    bar\n  &quot;: &quot;literal-string&quot;}</span>
<span id="L214" class="LineNr">214 </span>
<span id="L215" class="LineNr">215 </span><span class="Delimiter">:(scenario string_literal_empty)</span>
<span id="L216" class="LineNr">216 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L217" class="LineNr">217 </span>  copy []
<span id="L218" class="LineNr">218 </span>]
<span id="L219" class="LineNr">219 </span><span class="traceContains">+parse:   ingredient: {&quot;&quot;: &quot;literal-string&quot;}</span>
<span id="L220" class="LineNr">220 </span>
<span id="L221" class="LineNr">221 </span><span class="Delimiter">:(scenario multiple_unfinished_recipes)</span>
<span id="L222" class="LineNr">222 </span><span class="Special">% Hide_errors = true;</span>
<span id="L223" class="LineNr">223 </span><span class="muRecipe">def</span> f1 [
<span id="L224" class="LineNr">224 </span><span class="muRecipe">def</span> f2 [
<span id="L225" class="LineNr">225 </span><span class="traceContains">+error: unbalanced '['</span>
</pre>
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