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app-map-tidylib.html

app-map-tidylib.html 7.8 KB
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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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  2. <html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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  3. <title>Mapping the HTMLTidy library into the Application - Boost.Outcome documentation</title>
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    13. 

  13.   <div class="titlepage"><div><div><h1 style="clear: both">Mapping the HTMLTidy library into the Application</h1></div></div></div>
    14. 

  14.   <p>Once again, we create a custom STL exception type to represent failure
    15. 

  15. from the HTMLTidy library. We also create an <code>app</code> namespace wrapper
    16. 

  16. for the C <code>tidy_html()</code> function which is more C++ friendly.</p>
    17. 

  17. 

  18. <div class="code-snippet"><div class="highlight"><pre class="chroma"><code class="language-c++" data-lang="c++"><span class="k">namespace</span> <span class="n">app</span>
    19. 

  19. <span class="p">{</span>
    20. 

  20.   <span class="c1">// Specialise an exception type for tidylib errors
    21. 

  21. </span><span class="c1"></span>  <span class="k">struct</span> <span class="nl">tidylib_error</span> <span class="p">:</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span>
    22. 

  22.   <span class="p">{</span>
    23. 

  23.     <span class="c1">// passthrough
    24. 

  24. </span><span class="c1"></span>    <span class="k">using</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span><span class="o">::</span><span class="n">system_error</span><span class="p">;</span>
    25. 

  25.     <span class="n">tidylib_error</span><span class="p">()</span> <span class="o">=</span> <span class="k">default</span><span class="p">;</span>
    26. 

  26.     <span class="k">explicit</span> <span class="nf">tidylib_error</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span>
    27. 

  27.         <span class="o">:</span> <span class="n">std</span><span class="o">::</span><span class="n">system_error</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">generic_category</span><span class="p">())</span>
    28. 

  28.     <span class="p">{</span>
    29. 

  29.     <span class="p">}</span>
    30. 

  30.   <span class="p">};</span>
    31. 

  31. 

  32.   <span class="c1">// Create a C++ invoking wrapper for the tidylib C API, modifying data with the returned data,
    33. 

  33. </span><span class="c1"></span>  <span class="c1">// returing a unique_ptr to release storage on scope exit.
    34. 

  34. </span><span class="c1"></span>  <span class="k">struct</span> <span class="n">call_free</span>
    35. 

  35.   <span class="p">{</span>
    36. 

  36.     <span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span> <span class="kt">void</span> <span class="k">operator</span><span class="p">()(</span><span class="n">T</span> <span class="o">*</span><span class="n">p</span><span class="p">)</span> <span class="p">{</span> <span class="o">::</span><span class="n">free</span><span class="p">(</span><span class="n">p</span><span class="p">);</span> <span class="p">}</span>
    37. 

  37.   <span class="p">};</span>
    38. 

  38.   <span class="kr">inline</span> <span class="n">outcome</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o">&lt;</span><span class="kt">char</span><span class="p">,</span> <span class="n">call_free</span><span class="o">&gt;&gt;</span> <span class="n">tidy_html</span><span class="p">(</span><span class="n">string_view</span> <span class="o">&amp;</span><span class="n">data</span><span class="p">)</span>
    39. 

  39.   <span class="p">{</span>
    40. 

  40.     <span class="kt">char</span> <span class="o">*</span><span class="n">out</span> <span class="o">=</span> <span class="k">nullptr</span><span class="p">;</span>
    41. 

  41.     <span class="n">size_t</span> <span class="n">outlen</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
    42. 

  42.     <span class="kt">int</span> <span class="n">errcode</span> <span class="o">=</span> <span class="o">::</span><span class="n">tidy_html</span><span class="p">(</span><span class="o">&amp;</span><span class="n">out</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">outlen</span><span class="p">,</span> <span class="n">data</span><span class="p">.</span><span class="n">data</span><span class="p">(),</span> <span class="n">data</span><span class="p">.</span><span class="n">size</span><span class="p">());</span>
    43. 

  43.     <span class="k">if</span><span class="p">(</span><span class="n">errcode</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span>
    44. 

  44.     <span class="p">{</span>
    45. 

  45.       <span class="c1">// If the error code matches a standard STL exception, throw as that.
    46. 

  46. </span><span class="c1"></span>      <span class="n">BOOST_OUTCOME_V2_NAMESPACE</span><span class="o">::</span><span class="n">try_throw_std_exception_from_error</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">error_code</span><span class="p">(</span><span class="n">errcode</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="n">generic_category</span><span class="p">()));</span>
    47. 

  47.       <span class="c1">// Otherwise wrap the error code into a tidylib_error exception throw
    48. 

  48. </span><span class="c1"></span>      <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">make_exception_ptr</span><span class="p">(</span><span class="n">tidylib_error</span><span class="p">(</span><span class="n">errcode</span><span class="p">));</span>
    49. 

  49.     <span class="p">}</span>
    50. 

  50.     <span class="c1">// Reset input view to tidied html
    51. 

  51. </span><span class="c1"></span>    <span class="n">data</span> <span class="o">=</span> <span class="n">string_view</span><span class="p">(</span><span class="n">out</span><span class="p">,</span> <span class="n">outlen</span><span class="p">);</span>
    52. 

  52.     <span class="c1">// Return a unique ptr to release storage on scope exit
    53. 

  53. </span><span class="c1"></span>    <span class="k">return</span> <span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o">&lt;</span><span class="kt">char</span><span class="p">,</span> <span class="n">call_free</span><span class="o">&gt;</span><span class="p">(</span><span class="n">out</span><span class="p">);</span>
    54. 

  54.   <span class="p">}</span>
    55. 

  55. <span class="p">}</span>  <span class="c1">// namespace app
    56. 

  56. </span><span class="c1"></span></code></pre></div><a href="https://github.com/boostorg/outcome/tree/master/doc/src/snippets/finale.cpp#L329" class="code-snippet-url" target="_blank">View this code on Github</a></div>
    57. 

  57. 

  58. 

  59. 

  60.         </div><p><small>Last revised: February 08, 2019 at 22:18:08 UTC</small></p>
    61. 

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    67.