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138 lines
7.1 KiB
138 lines
7.1 KiB
13 years ago
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<div class="section" id="builtin-modules-and-custom-interpreters">
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<span id="ref-builtin"></span><h1>Builtin Modules and Custom Interpreters<a class="headerlink" href="#builtin-modules-and-custom-interpreters" title="Permalink to this headline">¶</a></h1>
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<p>Sometimes you want to create a custom Python interpreter with some modules
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built in to the interpreter itself rather than being dynamically loaded. To
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do this the module must be created as a static library and linked with a
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custom stub and the normal Python library.</p>
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<p>To build the SIP module as a static library you must pass the <tt class="docutils literal"><span class="pre">-k</span></tt> command
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line option to <tt class="docutils literal"><span class="pre">configure.py</span></tt>. You should then build and install SIP as
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normal. (Note that, because the module is now a static library, you will not
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be able to import it.)</p>
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<p>To build a module you have created for your own library you must modify your
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own configuration script to pass a non-zero value as the <tt class="docutils literal"><span class="pre">static</span></tt> argument
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of the <tt class="docutils literal"><span class="pre">__init__()</span></tt> method of the <a title="sipconfig.ModuleMakefile" class="reference external" href="build_system.html#sipconfig.ModuleMakefile"><tt class="xref docutils literal"><span class="pre">sipconfig.ModuleMakefile</span></tt></a> class (or
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any derived class you have created). Normally you would make this configurable
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using a command line option in the same way that SIP’s <tt class="docutils literal"><span class="pre">configure.py</span></tt> handles
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it.</p>
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<p>The next stage is to create a custom stub and a Makefile. The SIP distribution
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contains a directory called <tt class="docutils literal"><span class="pre">custom</span></tt> which contains example stubs and a
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Python script that will create a correct Makefile. Note that, if your copy of
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SIP was part of a standard Linux distribution, the <tt class="docutils literal"><span class="pre">custom</span></tt> directory may
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not be installed on your system.</p>
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<p>The <tt class="docutils literal"><span class="pre">custom</span></tt> directory contains the following files. They are provided as
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examples - each needs to be modified according to your particular
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requirements.</p>
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<blockquote>
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<ul class="simple">
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<li><tt class="docutils literal"><span class="pre">mkcustom.py</span></tt> is a Python script that will create a Makefile which is
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then used to build the custom interpreter. Comments in the file describe
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how it should be modified.</li>
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<li><tt class="docutils literal"><span class="pre">custom.c</span></tt> is a stub for a custom interpreter on Linux/UNIX. It
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should also be used for a custom console interpreter on Windows (i.e.
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like <tt class="docutils literal"><span class="pre">python.exe</span></tt>). Comments in the file describe how it should be
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modified.</li>
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<li><tt class="docutils literal"><span class="pre">customw.c</span></tt> is a stub for a custom GUI interpreter on Windows (i.e.
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like <tt class="docutils literal"><span class="pre">pythonw.exe</span></tt>). Comments in the file describe how it should be
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modified.</li>
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</ul>
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</blockquote>
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<p>Note that this technique does not restrict how the interpreter can be used.
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For example, it still allows users to write their own applications that can
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import your builtin modules. If you want to prevent users from doing that,
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perhaps to protect a proprietary API, then take a look at the
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<a class="reference external" href="http://www.riverbankcomputing.com/software/vendorid/">VendorID</a> package.</p>
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