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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"> <- </span>copy <span class="Constant">3.14159</span>
]
<span class="traceContains">+parse: ingredient: 3.14159: "literal-fractional-number"</span>
<span class="Delimiter">:(after "Parsing 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>
type = new type_tree<span class="Delimiter">(</span><span class="Constant">"literal-fractional-number"</span><span class="Delimiter">,</span> <span class="Constant">0</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 <span class="Comment">// no other characters</span>
&& s<span class="Delimiter">.</span>find_first_of<span class="Delimiter">(</span><span class="Constant">"0123456789"</span><span class="Delimiter">)</span> != string::npos <span class="Comment">// at least one digit</span>
&& s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'-'</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> == string::npos <span class="Comment">// '-' only at first position</span>
&& std::count<span class="Delimiter">(</span>s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> s<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> <span class="Constant">'.'</span><span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// exactly one decimal point</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>
void test_is_noninteger<span class="Delimiter">()</span> <span class="Delimiter">{</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"1234"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"1a2"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">"234.0"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"..."</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"."</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">"2."</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">".2"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">"-.2"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">"-2."</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"--.2"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">".-2"</span><span class="Delimiter">));</span>
CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">"..2"</span><span class="Delimiter">));</span>
<span class="Delimiter">}</span>
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