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POParsing a string in D
 

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    <p>I'm trying to learn D but am struggling with lack of documentation (or my understanding of it), so I came here. I already asked a different but unrelated question earlier today.</p> <p>Anyway, here goes:</p> <p>I would like to parse a string for different things.</p> <p>String format is something like:</p> <pre><code>[&lt;label&gt;] &lt;mnemonic&gt; [parameters] </code></pre> <p>If there is no label, there is mandatory whitespace. Parameters can be comma-delimited. Parameter types are dependent on the mnemonic.</p> <p>I would like to use <code>std.conv: parse</code> from the Phobos library to aid me, but I fail to understand the documentation on how to parse a "word", as in, some characters seperated by whitespace on either end. It works fine for integers and the like as <code>int i = parse!int(line)</code>. But if I were to do <code>string s = parse!string(line)</code> it would grab the entire line.</p> <p>I cold parse this by hand, using <code>char**</code> (or, <code>ref string</code>) as a datatype, just like I did when I wrote this in C. But I'm learning D to not have to.</p> <p>I tried something like this to do it manually:</p> <pre><code>string get_word(ref string s) { int i = 0; while (i &lt; s.length &amp;&amp; isAlphaNum(s[i])) i++; string word = s[0 .. i]; s = s[i+1 .. $]; return word; } </code></pre> <p>Is this a good way to do it? Is there a cleaner way? A faster way? A safer way, perhaps? I'm not sure the <code>i+1</code> index always exists.</p> <p>Thanks for the help!</p> <p>My faith in D is slightly dwindling already, as I've run into all sorts of problems. But the path is surely going to be worth it.</p>
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