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specialqtflags.html

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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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  5. <meta name="author" content="Emanuel Eichhammer" />
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  6. <meta name="copyright" content="(C) 2013-2015 Emanuel Eichhammer" />
    7. 

  7. <title>Using QCustomPlot with special Qt define flags</title>
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  12. <a class="headerLink"  href="index.html">Main Page</a> &middot;
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  19. <div class="header">
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  20.   <div class="headertitle">
    21. 

  21. <div class="title">Using <a class="el" href="classQCustomPlot.html" title="The central class of the library. This is the QWidget which displays the plot and interacts with the ...">QCustomPlot</a> with special Qt define flags </div>  </div>
    22. 

  22. </div><!--header-->
    23. 

  23. <div class="contents">
    24. 

  24. <div class="textblock"><h1><a class="anchor" id="specialqtflags-noascii"></a>
    25. 

  25. Safe string casts with QT_NO_CAST_FROM_ASCII and QT_NO_CAST_TO_ASCII</h1>
    26. 

  26. <p><a class="el" href="classQCustomPlot.html" title="The central class of the library. This is the QWidget which displays the plot and interacts with the ...">QCustomPlot</a> can be compiled with the special Qt flags <code>QT_NO_CAST_FROM_ASCII</code> and <code>QT_NO_CAST_TO_ASCII</code> out of the box. All strings used in the library are wrapped in QLatin1String to avoid casts from string/char literals. So if your project requires the added cast safety from these Qt flags, you can use QCustomPlot without any changes necessary.</p>
    27. 

  27. <h1><a class="anchor" id="specialqtflags-nokeywords"></a>
    28. 

  28. Avoiding Qt specific language extensions with QT_NO_KEYWORDS</h1>
    29. 

  29. <p>QCustomPlot is a library based on and <em>written in</em> Qt. This means it uses Qt keywords such as <code>foreach</code>, <code>signal</code>, <code>slot</code> and <code>emit</code> for improved legibility.</p>
    30. 

  30. <p>However, some projects wish to disable these Qt specific language extensions by using the define flag <code>QT_NO_KEYWORDS</code>. To compile QCustomPlot with that flag set, it is necessary to replace all occurances of Qt keywords. This is easily done with QCustomPlot code, by using the following regular expression replacements:</p>
    31. 

  31. <table class="doxtable">
    32. 

  32. <tr>
    33. 

  33. <td style="text-align:center;font-weight:bold">Search pattern</td><td style="text-align:center;font-weight:bold">Replace with </td></tr>
    34. 

  34. <tr>
    35. 

  35. <td><code>(^|[^\a_])emit\s</code></td><td><code>\1Q_EMIT&#160;</code>&mdash;<span style="font-size:0.9em">note the trailing space</span> </td></tr>
    36. 

  36. <tr>
    37. 

  37. <td><code>^( *)signals:</code></td><td><code>\1Q_SIGNALS:</code> </td></tr>
    38. 

  38. <tr>
    39. 

  39. <td><code>(^|[^\a_])foreach( *)\(</code></td><td><code>\1Q_FOREACH\2(</code> </td></tr>
    40. 

  40. </table>
    41. 

  41. <p>QCustomPlot code is written with these replacements in mind. They always work and catch all occurances of used Qt keywords. Their functioning is also automatically tested upon every release.</p>
    42. 

  42. <p>The regular expressions can be applied in any IDE/Editor that supports them, including QtCreator itself. Below is a python script that is used to test the functioning of the regular expressions. It takes the names of the files to process (e.g. <em>qcustomplot.cpp qcustomplot.h</em>) from the command line and performs the replacement on them.</p>
    43. 

  43. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">#!/usr/bin/env python</span></div>
    44. 

  44. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div>
    45. 

  45. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"># This script is used to make the amalgamated sources qcustomplot.h/.cpp compatible</span></div>
    46. 

  46. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"># to compiles with flag QT_NO_KEYWORDS set. It applies the following regular expression replacements</span></div>
    47. 

  47. <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">#</span></div>
    48. 

  48. <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">#   (^|[^\a_])emit\s        -&gt;  \1Q_EMIT </span></div>
    49. 

  49. <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">#   ^( *)signals:           -&gt;  \1Q_SIGNALS:</span></div>
    50. 

  50. <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">#   (^|[^\a_])foreach( *)\( -&gt;  \1Q_FOREACH\2(</span></div>
    51. 

  51. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">#</span></div>
    52. 

  52. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"># to the files whose filenames are passed on the command line. The replacement can in principle be</span></div>
    53. 

  53. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"># applied to the sources with any other tool or editor that knows regular expressions.</span></div>
    54. 

  54. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">#</span></div>
    55. 

  55. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"># To test: Copy freshly amalgamated qcustomplot.h/.cpp files into this directory, call this script on</span></div>
    56. 

  56. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"># them, and then run qmake; make</span></div>
    57. 

  57. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
    58. 

  58. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="keyword">import</span> os, sys, re</div>
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  59. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div>
    60. 

  60. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;baseDir = sys.path[0];</div>
    61. 

  61. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;os.chdir(baseDir) <span class="comment"># change current working dir to script dir</span></div>
    62. 

  62. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;  </div>
    63. 

  63. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">def </span>performKeywordReplacement(filename):</div>
    64. 

  64. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;  <span class="keywordflow">print</span> <span class="stringliteral">&quot;making &#39;&quot;</span>+filename+<span class="stringliteral">&quot;&#39; no-keywords-compatible...&quot;</span></div>
    65. 

  65. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;  patterns = []</div>
    66. 

  66. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;  patterns.append((re.compile(<span class="stringliteral">&quot;(^|[^\\a_])emit\\s&quot;</span>), <span class="stringliteral">&quot;\\1Q_EMIT &quot;</span>))</div>
    67. 

  67. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;  patterns.append((re.compile(<span class="stringliteral">&quot;^( *)signals:&quot;</span>), <span class="stringliteral">&quot;\\1Q_SIGNALS:&quot;</span>))</div>
    68. 

  68. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  patterns.append((re.compile(<span class="stringliteral">&quot;(^|[^\\a_])foreach( *)\\(&quot;</span>), <span class="stringliteral">&quot;\\1Q_FOREACH\\2(&quot;</span>))</div>
    69. 

  69. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;  inFile = open(filename)</div>
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  70. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;  outFilename = filename + <span class="stringliteral">&quot;.tmp&quot;</span></div>
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  71. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;  outFile = open(outFilename, <span class="stringliteral">&quot;w&quot;</span>)</div>
    72. 

  72. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;  <span class="keywordflow">for</span> line <span class="keywordflow">in</span> inFile:</div>
    73. 

  73. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keywordflow">for</span> patt <span class="keywordflow">in</span> patterns:</div>
    74. 

  74. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;      line = re.sub(patt[0], patt[1], line)</div>
    75. 

  75. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    outFile.write(line)</div>
    76. 

  76. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;  outFile.close()</div>
    77. 

  77. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;  inFile.close()</div>
    78. 

  78. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;  os.remove(filename)</div>
    79. 

  79. <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;  os.rename(outFilename, filename)</div>
    80. 

  80. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    </div>
    81. 

  81. <div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="keywordflow">for</span> filename <span class="keywordflow">in</span> sys.argv[1:]:</div>
    82. 

  82. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;  <span class="keywordflow">if</span> <span class="keywordflow">not</span> os.path.isfile(filename):</div>
    83. 

  83. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="keywordflow">print</span> <span class="stringliteral">&quot;file &#39;&quot;</span>+filename+<span class="stringliteral">&quot;&#39; not found&quot;</span></div>
    84. 

  84. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    sys.exit(-1)</div>
    85. 

  85. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;  performKeywordReplacement(filename);</div>
    86. 

  86. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
    87. 

  87. </div><!-- fragment --> </div></div><!-- contents -->
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  88. </body>
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  89. </html>
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  90.