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<div class="title">tuple_formatter.c</div> </div>
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<a href="tuple__formatter_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * tuple_formatter.c</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2007 William Pitcock</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * this list of conditions, and the following disclaimer.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * this list of conditions, and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * provided with the distribution.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * This software is provided "as is" and without any warranty, express or</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * implied. In no event shall the authors be liable for any damages arising from</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * the use of this software.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <glib.h></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <pthread.h></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="tuple__compiler_8h.html">tuple_compiler.h</a>"</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="tuple__formatter_8h.html">tuple_formatter.h</a>"</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * the tuple formatter:</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * this is a data-driven meta-language which eventually hopes to be</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * turing complete.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * language constructs follow the following basic rules:</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * - begin with ${</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * - end with }</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * language constructs:</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * - ${field}: prints a field</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * - ${?field:expr}: evaluates expr if field exists</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * - ${=field,"value"}: defines field in the currently iterated</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * tuple as string value of "value"</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * - ${=field,value}: defines field in the currently iterated</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * tuple as integer value of "value"</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * - ${==field,field:expr}: evaluates expr if both fields are the same</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * - ${!=field,field:expr}: evaluates expr if both fields are not the same</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * - ${(empty)?field:expr}: evaluates expr if field is empty or does not exist</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * - %{function:args,arg2,...}: runs function and inserts the result.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * everything else is treated as raw text.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * additionally, plugins can add additional instructions and functions!</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * Compile a tuplez string and cache the result.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * This caches the result for the last string, so that</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * successive calls are sped up.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a name="l00059"></a><span class="lineno"><a class="code" href="tuple__formatter_8h.html#ad81f6058cbb886711fa6de62f423cde5"> 59</a></span> <span class="keywordtype">char</span> * <a class="code" href="tuple__formatter_8c.html#ad81f6058cbb886711fa6de62f423cde5">tuple_formatter_process_string</a> (<span class="keyword">const</span> Tuple * tuple, <span class="keyword">const</span> <span class="keywordtype">char</span> * <span class="keywordtype">string</span>)</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">static</span> pthread_mutex_t <a class="code" href="eventqueue_8c.html#a4acff8232e4aec9cd5c6dc200ac55ef3">mutex</a> = PTHREAD_MUTEX_INITIALIZER;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  pthread_mutex_lock (& mutex);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">static</span> <span class="keywordtype">char</span> *last_string = <a class="code" href="core_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">static</span> TupleEvalContext *last_ctx = <a class="code" href="core_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">static</span> TupleEvalNode *last_ev = <a class="code" href="core_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (! last_string || strcmp (<span class="keywordtype">string</span>, last_string))</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  g_free(last_string);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (last_ctx != <a class="code" href="core_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>)</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <a class="code" href="tuple__compiler_8c.html#a276edba3ecfe9b15d1bb123043a525e3">tuple_evalctx_free</a>(last_ctx);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="tuple__compiler_8c.html#abec58d0d0ade19d0f4419ecb5f3004d7">tuple_evalnode_free</a>(last_ev);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  last_ctx = <a class="code" href="tuple__compiler_8c.html#ae0c3c6cbd1121f969a34f78fd06701b1">tuple_evalctx_new</a>();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  last_string = g_strdup(<span class="keywordtype">string</span>);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  last_ev = <a class="code" href="tuple__compiler_8c.html#a8cb508772fc7570d5e58d11fd063c95c">tuple_formatter_compile</a>(last_ctx, last_string);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">static</span> GString * buf;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (! buf)</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  buf = g_string_sized_new (255);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <a class="code" href="tuple__compiler_8c.html#a2527fd777ff8e2fabeda25186096fc1b">tuple_formatter_eval</a> (last_ctx, last_ev, tuple, buf);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <a class="code" href="tuple__compiler_8c.html#af6a843e9556f4b2c772a1e739a9a4587">tuple_evalctx_reset</a> (last_ctx);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">char</span> * result = <a class="code" href="core_8h.html#a4c9271c59af4564d3991b838674528dc">str_get</a> (buf->str);</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  pthread_mutex_unlock (& mutex);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div>
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