html/014literal_noninteger.cc.html


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<pre id='vimCodeElement'>
<span class="Comment">//: Support literal non-integers.</span>

<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario noninteger_literal)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">3.14159</span>
]
<span class="traceContains">+parse:   ingredient: {name: &quot;3.14159&quot;, properties: [&quot;3.14159&quot;: &quot;literal-number&quot;]}</span>

<span class="Delimiter">:(after &quot;Parsing reagent(string s)&quot;)</span>
if <span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span>s<span class="Delimiter">))</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-number&quot;</span><span class="Delimiter">);</span>
  set_value<span class="Delimiter">(</span>to_double<span class="Delimiter">(</span>s<span class="Delimiter">));</span>
  <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
bool is_noninteger<span class="Delimiter">(</span>const string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> s<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789-.&quot;</span><span class="Delimiter">)</span> == string::npos
      &amp;&amp; s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'.'</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

double to_double<span class="Delimiter">(</span>string n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  char* end = <span class="Constant">NULL</span><span class="Delimiter">;</span>
  <span class="Comment">// safe because string.c_str() is guaranteed to be null-terminated</span>
  double result = strtod<span class="Delimiter">(</span>n<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> &amp;end<span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>*end == <span class="cSpecial">'\0'</span><span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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