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  1. <!DOCTYPE html>

  2. <!--

  3.    Licensed to the Apache Software Foundation (ASF) under one or more

  4.    contributor license agreements.  See the NOTICE file distributed with

  5.    this work for additional information regarding copyright ownership.

  6.    The ASF licenses this file to You under the Apache License, Version 2.0

  7.    (the "License"); you may not use this file except in compliance with

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  9. 

  10.        https://www.apache.org/licenses/LICENSE-2.0

  11. 

  12.    Unless required by applicable law or agreed to in writing, software

  13.    distributed under the License is distributed on an "AS IS" BASIS,

  14.    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  15.    See the License for the specific language governing permissions and

  16.    limitations under the License.

  17. -->

  18. <html lang="en">

  19. <head>

  20. <link rel="stylesheet" type="text/css" href="../stylesheets/style.css">

  21. <title>JJTree Task</title>

  22. </head>

  23. <body>

  24. 

  25. <h2 id="jjtree">JJTree</h2>

  26. 

  27. <h3>Description</h3>

  28. <p>Invokes the <a href="https://javacc.org/" target="_top">JJTree</a> preprocessor for the JavaCC

  29. compiler compiler. It inserts parse tree building actions at various places in the JavaCC source

  30. that it generates. The output of JJTree is run through JavaCC to create the parser.</p>

  31. <p>To use the <code>jjtree</code> task, set the <var>target</var> attribute to the name of the

  32. JJTree grammar file to process. You also need to specify the directory containing the JavaCC

  33. installation using the <var>javacchome</var> attribute, so that Ant can find the JavaCC

  34. classes. Optionally, you can also set the <var>outputdirectory</var> to write the generated JavaCC

  35. grammar and node files to a specific directory.  Otherwise <code>jjtree</code> writes the generated

  36. JavaCC grammar and node files to the directory containing the JJTree grammar file. As an extra

  37. option, you can also set the <var>outputfile</var> to write the generated JavaCC grammar file to a

  38. specific (directory and) file.  Otherwise <code>jjtree</code> writes the generated JavaCC grammar

  39. file as the JJTree grammar file with a suffix <samp>.jj</samp>.</p>

  40. <p>This task only invokes JJTree if the grammar file is newer than the generated JavaCC file.</p>

  41. 

  42. <h3>Parameters</h3>

  43. 

  44. <table class="attr">

  45. <tr>

  46.   <th scope="col">Attribute</th>

  47.   <th scope="col">Description</th>

  48.   <th scope="col">Required</th>

  49. </tr>

  50. 

  51. <tr>

  52.   <td>target</td>

  53.   <td>The JJTree grammar file to process.</td>

  54.   <td>Yes</td>

  55. </tr>

  56. 

  57. <tr>

  58.   <td>javacchome</td>

  59.   <td>The directory containing the JavaCC distribution.</td>

  60.   <td>Yes</td>

  61. </tr>

  62. 

  63. <tr>

  64.   <td>outputdirectory</td>

  65.   <td>The directory to write the generated JavaCC grammar and node files to.  If not set, the files

  66.     are written to the directory containing the grammar file.</td>

  67.   <td>No</td>

  68. </tr>

  69. 

  70. <tr>

  71.   <td>outputfile</td>

  72.   <td>The file to write the generated JavaCC grammar file to. If not set, the file is written with

  73.     the same name as the JJTree grammar file but with a the suffix <code>.jj</code>.  This is a

  74.     filename relative to <var>outputdirectory</var> if specified, the project's basedir.</td>

  75.   <td>No</td>

  76. </tr>

  77. 

  78. <tr>

  79.   <td>buildnodefiles</td>

  80.   <td>Sets the BUILD_NODE_FILES grammar option. This is a boolean option.</td>

  81.   <td>No</td>

  82. </tr>

  83. 

  84. <tr>

  85.   <td>multi</td>

  86.   <td>Sets the MULTI grammar option. This is a boolean option.</td>

  87.   <td>No</td>

  88. </tr>

  89. 

  90. <tr>

  91.   <td>nodedefaultvoid</td>

  92.   <td>Sets the NODE_DEFAULT_VOID grammar option. This is a boolean option.</td>

  93.   <td>No</td>

  94. </tr>

  95. 

  96. <tr>

  97.   <td>nodefactory</td>

  98.   <td>Sets the NODE_FACTORY grammar option. This is boolean option.</td>

  99.   <td>No</td>

  100. </tr>

  101. 

  102. <tr>

  103.   <td>nodescopehook</td>

  104.   <td>Sets the NODE_SCOPE_HOOK grammar option. This is a boolean option.</td>

  105.   <td>No</td>

  106. </tr>

  107. 

  108. <tr>

  109.   <td>nodeusesparser</td>

  110.   <td>Sets the NODE_USES_PARSER grammar option. This is a boolean option.</td>

  111.   <td>No</td>

  112. </tr>

  113. 

  114. <tr>

  115.   <td>static</td>

  116.   <td>Sets the STATIC grammar option. This is a boolean option.</td>

  117.   <td>No</td>

  118. </tr>

  119. 

  120. <tr>

  121.   <td>visitor</td>

  122.   <td>Sets the VISITOR grammar option. This is a boolean option.</td>

  123.   <td>No</td>

  124. </tr>

  125. 

  126. <tr>

  127.   <td>nodepackage</td>

  128.   <td>Sets the NODE_PACKAGE grammar option. This is a string option.</td>

  129.   <td>No</td>

  130. </tr>

  131. 

  132. <tr>

  133.   <td>visitorexception</td>

  134.   <td>Sets the VISITOR_EXCEPTION grammar option. This is a string option.</td>

  135.   <td>No</td>

  136. </tr>

  137. 

  138. <tr>

  139.   <td>nodeprefix</td>

  140.   <td>Sets the NODE_PREFIX grammar option. This is a string option.</td>

  141.   <td>No</td>

  142. </tr>

  143. 

  144. <tr>

  145.   <td>maxmemory</td>

  146.   <td>Max amount of memory to allocate to the forked JVM.  <em>since Ant 1.8.3</em></td>

  147.   <td>No</td>

  148. </tr>

  149. </table>

  150. 

  151. <h3>Example</h3>

  152. 

  153. <p>Invoke JJTree on grammar file <samp>src/Parser.jjt</samp>, writing the generated grammar

  154. file, <samp>Parser.jj</samp>, to <samp>build/src</samp>. The grammar option NODE_USES_PARSER is set

  155. to <q>true</q> when invoking JJTree.</p>

  156. <pre>

  157. &lt;jjtree target="src/Parser.jjt"

  158.         outputdirectory="build/src"

  159.         javacchome="c:/program files/JavaCC"

  160.         nodeusesparser="true"/&gt;</pre>

  161. 

  162. <h3>Comparison of output locations between command line JJTree and different Ant <code>taskdef</code>

  163. versions</h3>

  164. 

  165. <table>

  166.   <thead class="no-bold">

  167. <tr>

  168.   <th scope="col"><strong>Command line JJTree options</strong> and <em>generated files</em> (working directory: <samp>/tmp</samp>)</th>

  169.   <th scope="col"><strong>Ant 1.5.3</strong> versus command line</th>

  170.   <th scope="col"><strong>Ant 1.6</strong> versus command line</th>

  171. </tr>

  172.   </thead>

  173.   <tbody>

  174. <tr>

  175.   <td><pre><b>jjtree  grammar.jjt</b>

  176.     /tmp/grammar.jj

  177.     /tmp/&lt;generated&gt;.java</pre>

  178.   </td>

  179.   <td>Same</td>

  180.   <td>Same</td>

  181. </tr>

  182. <tr>

  183.   <td><pre><b>jjtree  relative/grammar.jjt</b>

  184.     /tmp/grammar.jj

  185.     /tmp/&lt;generated&gt;.java</pre>

  186.   </td>

  187.   <td><pre>

  188. /tmp/relative/grammar.jj

  189. /tmp/relative/&lt;generated&gt;.java</pre>

  190.   </td>

  191.   <td>Same</td>

  192. </tr>

  193. <tr>

  194.   <td><pre><b>jjtree /tmp/absolute/grammar.jjt</b>

  195.     /tmp/grammar.jj

  196.     /tmp/&lt;generated&gt;.java</pre>

  197.   </td>

  198.   <td><pre>

  199. /tmp/absolute/grammar.jj

  200. /tmp/absolute/&lt;generated&gt;.java</pre>

  201.   </td>

  202.   <td>Same</td>

  203. </tr>

  204. <tr>

  205.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:relative grammar.jjt</b>

  206.     /tmp/relative/grammar.jj

  207.     /tmp/relative/&lt;generated&gt;.java</pre>

  208.   </td>

  209.   <td>Same</td>

  210.   <td>Same</td>

  211. </tr>

  212. <tr>

  213.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:relative relative/grammar.jjt</b>

  214.     /tmp/relative/grammar.jj

  215.     /tmp/relative/&lt;generated&gt;.java</pre>

  216.   </td>

  217.   <td>Same</td>

  218.   <td>Same</td>

  219. </tr>

  220. <tr>

  221.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:relative /tmp/absolute/grammar.jjt</b>

  222.     /tmp/relative/grammar.jj

  223.     /tmp/relative/&lt;generated&gt;.java</pre>

  224.   </td>

  225.   <td>Same</td>

  226.   <td>Same</td>

  227. </tr>

  228. <tr>

  229.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:/tmp/absolute/ grammar.jjt</b>

  230.     /tmp/absolute/grammar.jj

  231.     /tmp/absolute/&lt;generated&gt;.java</pre>

  232.   </td>

  233.   <td>Same</td>

  234.   <td>Same</td>

  235. </tr>

  236. <tr>

  237.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:/tmp/absolute/ relative/grammar.jjt</b>

  238.     /tmp/absolute/grammar.jj

  239.     /tmp/absolute/&lt;generated&gt;.java</pre>

  240.   </td>

  241.   <td>Same</td>

  242.   <td>Same</td>

  243. </tr>

  244. <tr>

  245.   <td><pre><b>jjtree -OUTPUT_DIRECTORY:/tmp/absolute/ /tmp/absolute/grammar.jjt</b>

  246.     /tmp/absolute/grammar.jj

  247.     /tmp/absolute/&lt;generated&gt;.java</pre>

  248.   </td>

  249.   <td>Same</td>

  250.   <td>Same</td>

  251. </tr>

  252. <tr>

  253.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj grammar.jjt</b>

  254.     /tmp/output.jj

  255.     /tmp/&lt;generated&gt;.java</pre>

  256.   </td>

  257.   <td>Not Supported</td>

  258.   <td>Same</td>

  259. </tr>

  260. <tr>

  261.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj relative/grammar.jjt</b>

  262.     /tmp/output.jj

  263.     /tmp/&lt;generated&gt;.java</pre>

  264.   </td>

  265.   <td>Not Supported</td>

  266.   <td>Same</td>

  267. </tr>

  268. <tr>

  269.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj /tmp/absolute/grammar.jjt</b>

  270.     /tmp/output.jj

  271.     /tmp/&lt;generated&gt;.java</pre>

  272.   </td>

  273.   <td>Not Supported</td>

  274.   <td>Same</td>

  275. </tr>

  276. <tr>

  277.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:relative grammar.jjt</b>

  278.     /tmp/relative/output.jj

  279.     /tmp/relative/&lt;generated&gt;.java</pre>

  280.   </td>

  281.   <td>Not Supported</td>

  282.   <td>Same</td>

  283. </tr>

  284. <tr>

  285.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:relative relative/grammar.jjt</b>

  286.     /tmp/relative/output.jj

  287.     /tmp/relative/&lt;generated&gt;.java</pre>

  288.   </td>

  289.   <td>Not Supported</td>

  290.   <td>Same</td>

  291. </tr>

  292. <tr>

  293.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:relative /tmp/absolute/grammar.jjt</b>

  294.     /tmp/relative/output.jj

  295.     /tmp/relative/&lt;generated&gt;.java</pre>

  296.   </td>

  297.   <td>Not Supported</td>

  298.   <td>Same</td>

  299. </tr>

  300. <tr>

  301.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ grammar.jjt</b>

  302.     /tmp/absolute/output.jj

  303.     /tmp/absolute/&lt;generated&gt;.java</pre>

  304.   </td>

  305.   <td>Not Supported</td>

  306.   <td>Same</td>

  307. </tr>

  308. <tr>

  309.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ relative/grammar.jjt</b>

  310.     /tmp/absolute/output.jj

  311.     /tmp/absolute/&lt;generated&gt;.java</pre>

  312.   </td>

  313.   <td>Not Supported</td>

  314.   <td>Same</td>

  315. </tr>

  316. <tr>

  317.   <td><pre><b>jjtree -OUTPUT_FILE:output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ /tmp/absolute/grammar.jjt</b>

  318.     /tmp/absolute/output.jj

  319.     /tmp/absolute/&lt;generated&gt;.java</pre>

  320.   </td>

  321.   <td>Not Supported</td>

  322.   <td>Same</td>

  323. </tr>

  324. <tr>

  325.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj grammar.jjt</b>

  326.     /tmp/subdir/output.jj

  327.     /tmp/&lt;generated&gt;.java</pre>

  328.   </td>

  329.   <td>Not Supported</td>

  330.   <td>Same</td>

  331. </tr>

  332. <tr>

  333.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj relative/grammar.jjt</b>

  334.     /tmp/subdir/output.jj

  335.     /tmp/&lt;generated&gt;.java</pre>

  336.   </td>

  337.   <td>Not Supported</td>

  338.   <td>Same</td>

  339. </tr>

  340. <tr>

  341.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj /tmp/absolute/grammar.jjt</b>

  342.     /tmp/subdir/output.jj

  343.     /tmp/&lt;generated&gt;.java</pre>

  344.   </td>

  345.   <td>Not Supported</td>

  346.   <td>Same</td>

  347. </tr>

  348. <tr>

  349.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:relative grammar.jjt</b>

  350.     /tmp/relative/subdir/output.jj

  351.     /tmp/relative/&lt;generated&gt;.java</pre>

  352.   </td>

  353.   <td>Not Supported</td>

  354.   <td>Same</td>

  355. </tr>

  356. <tr>

  357.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:relative relative/grammar.jjt</b>

  358.     /tmp/relative/subdir/output.jj

  359.     /tmp/relative/&lt;generated&gt;.java</pre>

  360.   </td>

  361.   <td>Not Supported</td>

  362.   <td>Same</td>

  363. </tr>

  364. <tr>

  365.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:relative /tmp/absolute/grammar.jjt</b>

  366.     /tmp/relative/subdir/output.jj

  367.     /tmp/relative/&lt;generated&gt;.java</pre>

  368.   </td>

  369.   <td>Not Supported</td>

  370.   <td>Same</td>

  371. </tr>

  372. <tr>

  373.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ grammar.jjt</b>

  374.     /tmp/absolute/subdir/output.jj

  375.     /tmp/absolute/&lt;generated&gt;.java</pre>

  376.   </td>

  377.   <td>Not Supported</td>

  378.   <td>Same</td>

  379. </tr>

  380. <tr>

  381.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ relative/grammar.jjt</b>

  382.     /tmp/absolute/subdir/output.jj

  383.     /tmp/absolute/&lt;generated&gt;.java</pre>

  384.   </td>

  385.   <td>Not Supported</td>

  386.   <td>Same</td>

  387. </tr>

  388. <tr>

  389.   <td><pre><b>jjtree -OUTPUT_FILE:subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ /tmp/absolute/grammar.jjt</b>

  390.     /tmp/absolute/subdir/output.jj

  391.     /tmp/absolute/&lt;generated&gt;.java</pre>

  392.   </td>

  393.   <td>Not Supported</td>

  394.   <td>Same</td>

  395. </tr>

  396. <tr>

  397.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj grammar.jjt</b>

  398.     /tmp/subdir/output.jj

  399.     /tmp/&lt;generated&gt;.java</pre>

  400.   </td>

  401.   <td>Not Supported</td>

  402.   <td>Same</td>

  403. </tr>

  404. <tr>

  405.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj relative/grammar.jjt</b>

  406.     /tmp/subdir/output.jj

  407.     /tmp/&lt;generated&gt;.java</pre>

  408.   </td>

  409.   <td>Not Supported</td>

  410.   <td>Same</td>

  411. </tr>

  412. <tr>

  413.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj /tmp/absolute/grammar.jjt</b>

  414.     /tmp/subdir/output.jj

  415.     /tmp/&lt;generated&gt;.java</pre>

  416.   </td>

  417.   <td>Not Supported</td>

  418.   <td>Same</td>

  419. </tr>

  420. <tr id="footnote-1-back">

  421.   <td><pre><b>jjtree -OUTPUT_FILE:<i>D:</i>/tmp/subdir/output.jj grammar.jjt</b>

  422.     /tmp/subdir/output.jj

  423.     /tmp/&lt;generated&gt;.java</pre>

  424.   </td>

  425.   <td>Not Supported</td>

  426.   <td>Not Supported<a href="#footnote-1"><sup>*</sup></a></td>

  427. </tr>

  428. <tr>

  429.   <td><pre><b>jjtree -OUTPUT_FILE:<i>D:</i>/tmp/subdir/output.jj relative/grammar.jjt</b>

  430.     /tmp/subdir/output.jj

  431.     /tmp/&lt;generated&gt;.java</pre>

  432.   </td>

  433.   <td>Not Supported</td>

  434.   <td>Not Supported<a href="#footnote-1"><sup>*</sup></a></td>

  435. </tr>

  436. <tr>

  437.   <td><pre><b>jjtree -OUTPUT_FILE:<i>D:</i>/tmp/subdir/output.jj /tmp/absolute/grammar.jjt</b>

  438.     /tmp/subdir/output.jj

  439.     /tmp/&lt;generated&gt;.java</pre>

  440.   </td>

  441.   <td>Not Supported</td>

  442.   <td>Not Supported<a href="#footnote-1"><sup>*</sup></a></td>

  443. </tr>

  444. <tr>

  445.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:relative grammar.jjt</b>

  446.     /tmp/relative/tmp/subdir/output.jj

  447.     /tmp/relative/&lt;generated&gt;.java</pre>

  448.   </td>

  449.   <td>Not Supported</td>

  450.   <td>Same</td>

  451. </tr>

  452. <tr>

  453.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:relative relative/grammar.jjt</b>

  454.     /tmp/relative/tmp/subdir/output.jj

  455.     /tmp/relative/&lt;generated&gt;.java</pre>

  456.   </td>

  457.   <td>Not Supported</td>

  458.   <td>Same</td>

  459. </tr>

  460. <tr>

  461.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:relative /tmp/absolute/grammar.jjt</b>

  462.     /tmp/relative/tmp/subdir/output.jj

  463.     /tmp/relative/&lt;generated&gt;.java</pre>

  464.   </td>

  465.   <td>Not Supported</td>

  466.   <td>Same</td>

  467. </tr>

  468. <tr>

  469.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ grammar.jjt</b>

  470.     /tmp/absolute/tmp/subdir/output.jj

  471.     /tmp/absolute/&lt;generated&gt;.java</pre>

  472.   </td>

  473.   <td>Not Supported</td>

  474.   <td>Same</td>

  475. </tr>

  476. <tr>

  477.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ relative/grammar.jjt</b>

  478.     /tmp/absolute/tmp/subdir/output.jj

  479.     /tmp/absolute/&lt;generated&gt;.java</pre>

  480.   </td>

  481.   <td>Not Supported</td>

  482.   <td>Same</td>

  483. </tr>

  484. <tr>

  485.   <td><pre><b>jjtree -OUTPUT_FILE:/tmp/subdir/output.jj -OUTPUT_DIRECTORY:/tmp/absolute/ /tmp/absolute/grammar.jjt</b>

  486.     /tmp/absolute/tmp/subdir/output.jj

  487.     /tmp/absolute/&lt;generated&gt;.java</pre>

  488.   </td>

  489.   <td>Not Supported</td>

  490.   <td>Same</td>

  491. </tr>

  492.   </tbody>

  493. </table>

  494. 

  495. <p id="footnote-1"><a href="#footnote-1-back"><strong>Note</strong></a>: When running JJTree with

  496. the Ant <code>taskdef jjtree</code> the option <kbd>-OUTPUT_DIRECTORY</kbd> must always be set,

  497. because the project's <var>basedir</var> and the Ant working directory might differ. So even if you

  498. don't specify the <var>outputdirectory</var> for <code>taskdef jjtree</code>, JJTree will be called

  499. with the <kbd>-OUTPUT_DIRECTORY</kbd> set to the project's <var>basedir</var>.  But when

  500. the <kbd>-OUTPUT_DIRECTORY</kbd> is set, the <kbd>-OUTPUT_FILE</kbd> setting is handled as if

  501. relative to this <kbd>-OUTPUT_DIRECTORY</kbd>. Thus when the <kbd>-OUTPUT_FILE</kbd> is absolute

  502. or contains a drive letter we have a problem.  Therefore absolute <var>outputfile</var>s (when

  503. the <var>outputdirectory</var> isn't specified) are made relative to the default directory.  And for

  504. this reason <var>outputfile</var>s that contain a drive letter can't be supported.</p>

  505. 

  506. <p>By the way: specifying a drive letter in the <kbd>-OUTPUT_FILE</kbd> when

  507. the <kbd>-OUTPUT_DIRECTORY</kbd> is set, also results in strange behavior when running JJTree from

  508. the command line.</p>

  509. 

  510. </body>

  511. </html>