than "Scanner|Logger" uses go test?

<p>I&#39;m interested in building a light-weight markup language, and sending error messages to the user, with the filename:line:column.</p> <p>What library that provides this function, or where is the source code to take advantage of it?</p> <hr/>**评论：**<br/><br/>TheMerovius: <pre><p>I am not quite sure, what you are asking.</p> <p>If you want to know how to get the positional information of where a function was called to output them (like e.g. <code>(*testing.T).Logf</code> does), the answer is <a href="https://godoc.org/runtime#Caller" rel="nofollow">runtime.Caller</a>. Example: <a href="https://play.golang.org/p/ae5lIK7DguU" rel="nofollow">https://play.golang.org/p/ae5lIK7DguU</a></p> <p>If you want to read a file and record positional informations of tokens and the like, you may be able to reuse <a href="https://godoc.org/go/token#FileSet" rel="nofollow">token.FileSet</a>, which is used by the <code>go/</code> packages. It essentially implements a mapping <code>int-&gt;(filename, line, column)</code>. Example: <a href="https://play.golang.org/p/TkVL_mt1Xz-" rel="nofollow">https://play.golang.org/p/TkVL_mt1Xz-</a></p> <p>Note, however, that the last examples cheats, as it uses bufio.Scanner to split into words, but then <em>assumes</em> that there is a single space between each word to keep track of the position the word is at. You likely have to write your own bufio.SplitFunc to keep track of the position consistently.</p> <p>The <a href="https://godoc.org/go/parser" rel="nofollow">go/parser</a> might also provide inspiration of how to use the <code>go/token</code> package correctly.</p> <p>Hope this helps?</p></pre>nasciiboy: <pre><p>wonderful!</p> <p>The former look like internal and debugging tools, but the latter are similar to what I want. although it looks like I&#39;ll have to implement a custom library</p> <p>I&#39;ve been looking around a bit and it looks like they&#39;re implementing something in the code for future versions, for example the <a href="https://godoc.org/fmt#ScanState" rel="nofollow">fmt.ScanState</a> interface that covers the previously available <a href="https://godoc.org/text/scanner" rel="nofollow">text/scanner</a>, only lacks one method to record the position (and the origin)</p> <p>really thanks for the guide!</p></pre>nasciiboy: <pre><p>(<a href="https://play.golang.org/p/TkVL_mt1Xz-" rel="nofollow">https://play.golang.org/p/TkVL_mt1Xz-</a>) I find it a little confusing how the Scanner relates with Fileset</p> <p>there is a dance between the text of the <code>Scanner.Scan.Text()</code>, the <code>Position</code> of token and the <code>word</code> structure</p></pre>TheMerovius: <pre><blockquote> <p>I find it a little confusing how the Scanner relates with Fileset</p> </blockquote> <p>Yes. That&#39;s what I mean when I say I&#39;m cheating here. You probably want to write your own <code>ScanFunc</code> that tokenizes as you want and keeps track of the position in the file you&#39;re in (and then adds that to the <code>(*FileSet).Base()</code> to get the final <code>token.Pos</code> of the token).</p> <p>As we say in mathematics &#34;that is left as an exercise for the reader&#34; :)</p></pre>nasciiboy: <pre><p>ha, ha, ha, home work</p></pre>