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authorKartik K. Agaram <vc@akkartik.com>2015-11-10 21:35:42 -0800
committerKartik K. Agaram <vc@akkartik.com>2015-11-10 21:43:45 -0800
commit76755b2836b0dadd88f82635f661f9d9df77604d (patch)
treef4f4429510c739fd1f9e51edd10e03c27107acba /html/015literal_noninteger.cc.html
parent080e9cb73fa55cdc862f1dd7593df56e0a6302b8 (diff)
downloadmu-76755b2836b0dadd88f82635f661f9d9df77604d.tar.gz
2423 - describe shape-shifting in html docs
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - 015literal_noninteger.cc</title>
+<meta name="Generator" content="Vim/7.4">
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+.cSpecial { color: #008000; }
+.Comment { color: #9090ff; }
+.Delimiter { color: #a04060; }
+.Special { color: #ff6060; }
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+<!--
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+-->
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+</head>
+<body>
+<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: {&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>
+  type = new type_tree<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> string_tree*&gt;<span class="Delimiter">(</span>name<span class="Delimiter">,</span> new string_tree<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_first_of    <span class="Delimiter">(</span><span class="Constant">&quot;0123456789-&quot;</span><span class="Delimiter">)</span> != string::npos
+      &amp;&amp; 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="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>
+
+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">&quot;1234&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;1a2&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;234.0&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;...&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>!is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;.&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;2.&quot;</span><span class="Delimiter">));</span>
+  CHECK<span class="Delimiter">(</span>is_noninteger<span class="Delimiter">(</span><span class="Constant">&quot;.2&quot;</span><span class="Delimiter">));</span>
+<span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->