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<pre id='vimCodeElement'>
<span class="Comment">//: For convenience, some instructions will take literal arrays of characters (strings).</span>
<span class="Comment">//:</span>
<span class="Comment">//: Instead of quotes, we'll use [] to delimit strings. That'll reduce the</span>
<span class="Comment">//: need for escaping since we can support nested brackets. And we can also</span>
<span class="Comment">//: imagine that 'recipe' might one day itself be defined in mu, doing its own</span>
<span class="Comment">//: parsing.</span>

<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario string_literal)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc def]  <span class="Comment"># copy can't really take a string</span>
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_with_colons)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc:def/ghi]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc:def/ghi&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
Type_ordinal[<span class="Constant">&quot;literal-string&quot;</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>

<span class="Delimiter">:(after &quot;string next_word(istream&amp; in)&quot;)</span>
  if <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>
    string result = slurp_quoted<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    skip_whitespace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    skip_comment<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="CommentedCode">//?     cerr &lt;&lt; '^' &lt;&lt; result &lt;&lt; &quot;$\n&quot;; //? 1</span>
    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
string slurp_quoted<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<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; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>  <span class="Comment">// slurp the '['</span>
  if <span class="Delimiter">(</span>code_string<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">))</span>
    slurp_quoted_comment_aware<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    slurp_quoted_comment_oblivious<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Comment">// A string is a code string if it contains a newline before any non-whitespace</span>
<span class="Comment">// todo: support comments before the newline. But that gets messy.</span>
bool code_string<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    char c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
    if <span class="Delimiter">(</span>!isspace<span class="Delimiter">(</span>c<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="CommentedCode">//?       cerr &lt;&lt; &quot;code_string: &quot; &lt;&lt; out.str() &lt;&lt; '\n'; //? 1</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?       cerr &lt;&lt; &quot;code_string: &quot; &lt;&lt; out.str() &lt;&lt; '\n'; //? 1</span>
      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// Read a regular string. Regular strings can only contain other regular</span>
<span class="Comment">// strings.</span>
void slurp_quoted_comment_oblivious<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;comment oblivious\n&quot;; //? 1</span>
  int brace_depth = <span class="Constant">1</span><span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    char c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="CommentedCode">//?     cerr &lt;&lt; '%' &lt;&lt; (int)c &lt;&lt; ' ' &lt;&lt; brace_depth &lt;&lt; &quot;: &quot; &lt;&lt; out.str() &lt;&lt; &quot;%$\n&quot;; //? 1</span>
<span class="CommentedCode">//?     cout &lt;&lt; (int)c &lt;&lt; &quot;: &quot; &lt;&lt; brace_depth &lt;&lt; '\n'; //? 2</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
<span class="CommentedCode">//?     cout &lt;&lt; out.str() &lt;&lt; &quot;$\n&quot;; //? 1</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> ++brace_depth<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> --brace_depth<span class="Delimiter">;</span>
    if <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 class="Delimiter">}</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>eof<span class="Delimiter">()</span> &amp;&amp; brace_depth &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
    out<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Comment">// Read a code string. Code strings can contain either code or regular strings.</span>
void slurp_quoted_comment_aware<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;comment aware\n&quot;; //? 1</span>
  char c<span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?     cerr &lt;&lt; '^' &lt;&lt; (int)c &lt;&lt; &quot;: &quot; &lt;&lt; out.str() &lt;&lt; &quot;$\n&quot;; //? 1</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; c<span class="Delimiter">;</span>
      while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<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; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'['</span><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="Comment">// recurse</span>
      out &lt;&lt; slurp_quoted<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  raise &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  out<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(after &quot;reagent::reagent(string s)&quot;)</span>
<span class="CommentedCode">//?   cout &lt;&lt; s.at(0) &lt;&lt; '\n'; //? 1</span>
  if <span class="Delimiter">(</span>s<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="Delimiter">{</span>
    assert<span class="Delimiter">(</span>*s<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">']'</span><span class="Delimiter">);</span>
    <span class="Comment">// delete [] delimiters</span>
    s<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>
    s<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>s<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
    name = s<span class="Delimiter">;</span>
    types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> vector&lt;string&gt; &gt;<span class="Delimiter">(</span>name<span class="Delimiter">,</span> vector&lt;string&gt;<span class="Delimiter">()));</span>
    properties<span class="Delimiter">.</span>back<span class="Delimiter">().</span>second<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">);</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>

<span class="Comment">//: Two tweaks to printing literal strings compared to other reagents:</span>
<span class="Comment">//:   a) Don't print the string twice in the representation, just put '_' in</span>
<span class="Comment">//:   the property list.</span>
<span class="Comment">//:   b) Escape newlines in the string to make it more friendly to trace().</span>

<span class="Delimiter">:(after &quot;string reagent::to_string()&quot;)</span>
  if <span class="Delimiter">(</span>!properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Identifier">return</span> emit_literal_string<span class="Delimiter">(</span>name<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
string emit_literal_string<span class="Delimiter">(</span>string name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  size_t pos = <span class="Constant">0</span><span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>pos != string::npos<span class="Delimiter">)</span>
    pos = replace<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 class="Identifier">return</span> <span class="Constant">&quot;{name: </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">, properties: [_: </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 class="Delimiter">}</span>

size_t replace<span class="Delimiter">(</span>string&amp; str<span class="Delimiter">,</span> const string&amp; from<span class="Delimiter">,</span> const string&amp; to<span class="Delimiter">,</span> size_t n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  size_t result = str<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">,</span> n<span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>result != string::npos<span class="Delimiter">)</span>
    str<span class="Delimiter">.</span>replace<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 class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario string_literal_nested)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc [def]]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc [def]&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_escaped)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc \[def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc [def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_escaped_comment_aware)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [
abc \\\[def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;\nabc \[def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_and_comment)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc]  <span class="Comment"># comment</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse:   ingredient: {name: &quot;abc&quot;, properties: [_: &quot;literal-string&quot;]}</span>
<span class="traceContains">+parse:   product: {name: &quot;1&quot;, properties: [&quot;1&quot;: &quot;address&quot;:&quot;array&quot;:&quot;character&quot;]}</span>
<span class="Comment"># no other ingredients</span>
$parse: <span class="Constant">3</span>

<span class="Delimiter">:(scenario string_literal_escapes_newlines_in_trace)</span>
recipe main [
  copy [abc
def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc\ndef&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_can_skip_past_comments)</span>
recipe main [
  copy [
    <span class="Comment"># ']' inside comment</span>
    bar
  ]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;\n    # ']' inside comment\n    bar\n  &quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_empty)</span>
recipe main [
  copy []
]
<span class="traceContains">+parse:   ingredient: {name: &quot;&quot;, properties: [_: &quot;literal-string&quot;]}</span>
</pre>
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