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<pre id='vimCodeElement'>
<span class="Comment">//: Support literal non-integers.</span>
<span class="Comment">//: '3.14159:literal' is ugly, so we'll just say '3.14159' for 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"> <- </span>copy <span class="Constant">3.14159</span>
]
<span class="traceContains">+parse: ingredient: {name: "3.14159", properties: ["3.14159": "literal-number"]}</span>
<span class="Delimiter">:(after "reagent::reagent(string s)")</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<string<span class="Delimiter">,</span> vector<string> ><span class="Delimiter">(</span>name<span class="Delimiter">,</span> vector<string><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">"literal-number"</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& 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">"0123456789-."</span><span class="Delimiter">)</span> == string::npos
&& 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> &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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