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<h1>script.cpp</h1><p>Example of creating a script interpreter.</p>
<div class="fragment"><pre class="fragment"><span class="comment">// Copyright (C) 1995-1999 David Sugar, Tycho Softworks.</span>
<span class="comment">// Copyright (C) 1999-2005 Open Source Telecom Corp.</span>
<span class="comment">// Copyright (C) 2005-2010 David Sugar, Tycho Softworks.</span>
<span class="comment">//</span>
<span class="comment">// This file is part of GNU uCommon C++.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is free software; you can redistribute it and/or modify</span>
<span class="comment">// it under the terms of the GNU General Public License as published by</span>
<span class="comment">// the Free Software Foundation; either version 3 of the License, or</span>
<span class="comment">// (at your option) any later version.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is distributed in the hope that it will be useful,</span>
<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the</span>
<span class="comment">// GNU General Public License for more details.</span>
<span class="comment">//</span>
<span class="comment">// You should have received a copy of the GNU General Public License</span>
<span class="comment">// along with GNU uCommon C++.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>

<span class="preprocessor">#include &lt;config.h&gt;</span>
<span class="preprocessor">#include &lt;<a class="code" href="a00202.html" title="This library holds the ucommon scripting engine code.">ucommon/script.h</a>&gt;</span>

<span class="keyword">using namespace </span>UCOMMON_NAMESPACE;

<span class="keyword">static</span> <span class="keywordtype">unsigned</span> checks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> exchecks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> refchecks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> mainchecks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> debugcount = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> printcount = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> eventchecks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> loopingchecks = 0;
<span class="keyword">static</span> <span class="keywordtype">unsigned</span> manipchecks = 0;

<span class="keyword">class </span>debug
{
<span class="keyword">public</span>:
    debug();

    <span class="keyword">const</span> <span class="keywordtype">char</span> *flag;

    <span class="keyword">virtual</span> <span class="keywordtype">void</span> print(<span class="keywordtype">void</span>);
};

<span class="keyword">class </span>testing : <span class="keyword">public</span> debug, <span class="keyword">public</span> script::interp
{
<span class="keyword">public</span>:
    <span class="keywordtype">bool</span> scrCheck(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckExit(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckMain(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckEvent(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckLoop(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckRefs(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrArgs(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrSleep(<span class="keywordtype">void</span>);
    <span class="keywordtype">bool</span> scrCheckManip(<span class="keywordtype">void</span>);
};

debug::debug()
{
    ++debugcount;
    flag = NULL;
}

<span class="keywordtype">void</span> debug::print(<span class="keywordtype">void</span>)
{
    <span class="keywordflow">if</span>(flag)
        printf(<span class="stringliteral">&quot;%s&quot;</span>, flag);
    <span class="keywordflow">else</span>
        ++printcount;
}

<span class="keywordtype">bool</span> testing::scrCheckManip(<span class="keywordtype">void</span>)
{
    ++manipchecks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrCheckEvent(<span class="keywordtype">void</span>)
{
    ++eventchecks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrCheckRefs(<span class="keywordtype">void</span>)
{
    ++refchecks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrCheckMain(<span class="keywordtype">void</span>)
{
    ++mainchecks;
    debug::print();
    <span class="keywordflow">if</span>(scriptEvent(<span class="stringliteral">&quot;event&quot;</span>))
        <span class="keywordflow">return</span> <span class="keyword">false</span>;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrCheckLoop(<span class="keywordtype">void</span>)
{
    ++loopingchecks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}


<span class="keywordtype">bool</span> testing::scrCheckExit(<span class="keywordtype">void</span>)
{
    ++exchecks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrCheck(<span class="keywordtype">void</span>)
{
    ++checks;
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">bool</span> testing::scrArgs(<span class="keywordtype">void</span>)
{
    <span class="keywordtype">unsigned</span> index = 0;
    script::line_t *line = stack[frame].line;

    <span class="keywordflow">while</span>(index &lt; line-&gt;argc) {
        <span class="keyword">const</span> <span class="keywordtype">char</span> *cp = getContent(line-&gt;argv[index]);
        printf(<span class="stringliteral">&quot; ARG %d %s &lt;%s&gt;\n&quot;</span>, index, line-&gt;argv[index], cp);
        ++index;
    }
    skip();
    <span class="keywordflow">return</span> <span class="keyword">false</span>;
}

<span class="keywordtype">bool</span> testing::scrSleep(<span class="keywordtype">void</span>)
{
    Thread::sleep(500);
    skip();
    <span class="keywordflow">return</span> <span class="keyword">true</span>;
}

<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
    testing interp;
    <span class="keywordtype">unsigned</span> errors;

    <span class="keyword">static</span> script::keyword_t keywords[] = {
        {<span class="stringliteral">&quot;check&quot;</span>, (script::method_t)&amp;testing::scrCheck, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.exit&quot;</span>, (script::method_t)&amp;testing::scrCheckExit, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.main&quot;</span>, (script::method_t)&amp;testing::scrCheckMain, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.event&quot;</span>, (script::method_t)&amp;testing::scrCheckEvent, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.loop&quot;</span>, (script::method_t)&amp;testing::scrCheckLoop, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.refs&quot;</span>, (script::method_t)&amp;testing::scrCheckRefs, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;check.manip&quot;</span>, (script::method_t)&amp;testing::scrCheckManip, &amp;script::checks::chkNop},
        {<span class="stringliteral">&quot;ignore&quot;</span>, (script::method_t)&amp;script::methods::scrNop, &amp;script::checks::chkIgnore}, 
        {<span class="stringliteral">&quot;args&quot;</span>, (script::method_t)&amp;testing::scrArgs, &amp;script::checks::chkIgnore},
        {<span class="stringliteral">&quot;sleep&quot;</span>, (script::method_t)&amp;testing::scrSleep, &amp;script::checks::chkNop},
        {NULL}};

    <span class="keyword">const</span> <span class="keywordtype">char</span> *filename = <span class="stringliteral">&quot;testscript.scr&quot;</span>;
    <span class="keyword">const</span> <span class="keywordtype">char</span> *mergename = <span class="stringliteral">&quot;mergescript.scr&quot;</span>;

    <span class="keywordflow">if</span>(argc &gt; 3) {
        fprintf(stderr, <span class="stringliteral">&quot;use: testscript [scrname]\n&quot;</span>);
        exit(-1);
    }

    <span class="keywordflow">if</span>(argc == 2) {
        mergename = NULL;
        filename = argv[1];
    }

    <a name="a0"></a><a class="code" href="a00201.html#a5fc126f9a4406cb2d0d054488cf00809" title="Template function to initialize memory by invoking default constructor.">script::init</a>();
    script::assign(keywords);

    script *image;

    <span class="keywordflow">if</span>(mergename) {
        image = script::compile(mergename);
        image = script::append(image, filename);
    }
    <span class="keywordflow">else</span>
        image = script::compile(filename);

    <span class="keywordflow">if</span>(!image) {
        fprintf(stderr, <span class="stringliteral">&quot;*** failed to load %s\n&quot;</span>, filename);
        exit(-1);
    }

    errors = image-&gt;getErrors();
    <span class="keywordflow">if</span>(errors) {
        fprintf(stderr, <span class="stringliteral">&quot;*** %d total errors in %s\n&quot;</span>, errors, filename);
        linked_pointer&lt;script::error&gt; ep = image-&gt;getListing();
        <span class="keywordflow">while</span>(<a name="a1"></a><a class="code" href="a00214.html#aa074f1a5a7f2741a51a01bc1607fb4a6" title="Convenience function to validate object assuming it is castable to bool.">is</a>(ep)) {
            fprintf(stderr, <span class="stringliteral">&quot;*** %s(%d): %s\n&quot;</span>, image-&gt;getFilename(), ep-&gt;errline, ep-&gt;errmsg);
            ep.next();
        }
        <span class="keyword">delete</span> image;
        exit(-1);
    }   

    interp.initialize();

    <span class="keywordflow">if</span>(!interp.attach(image)) {
        fprintf(stderr, <span class="stringliteral">&quot;*** no main section in %s\n&quot;</span>, filename);
        exit(-1);
    } 
    <span class="keywordflow">while</span>(interp.step()) {
        Thread::yield();
    }
    interp.detach();

    <span class="keywordflow">if</span>(argc &lt; 2) {
        <span class="comment">// enter correct generic number of &quot;checks&quot;</span>
        assert(checks == 3);

        <span class="comment">// enter validation of defined call by ref</span>
        assert(refchecks == 1);

        <span class="comment">// @exit handler called, and only once...</span>
        assert(exchecks == 1);

        <span class="comment">// @main handler called</span>
        assert(mainchecks == 1);

        <span class="comment">// @main ^event handler called</span>
        assert(eventchecks == 1);

        <span class="comment">// check looping operation</span>
        assert(loopingchecks == 3);

        <span class="comment">// in multiple inheritence base class initialized successfully</span>
        assert(debugcount == 1);

        <span class="comment">// in  multiple inheritence, method call this* has combined class</span>
        assert(printcount == 1);

        <span class="comment">// check manipulations</span>
        assert(manipchecks == 8);
    }

    exit(0);
}

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