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<h1>LanguageTable.cpp</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
00002 <span class="comment"> * Copyright (C) 2005 Maarten Keijzer</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
00005 <span class="comment"> * it under the terms of version 2 of the GNU General Public License as </span>
00006 <span class="comment"> * published by the Free Software Foundation. </span>
00007 <span class="comment"> *</span>
00008 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
00009 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
00010 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
00011 <span class="comment"> * GNU General Public License for more details.</span>
00012 <span class="comment"> *</span>
00013 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
00014 <span class="comment"> * along with this program; if not, write to the Free Software</span>
00015 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00016 <span class="comment"> */</span>
00017
00018
00019 <span class="preprocessor">#include "LanguageTable.h"</span>
00020 <span class="preprocessor">#include "Sym.h"</span>
00021
00022 <span class="preprocessor">#include &lt;utils/eoRNG.h&gt;</span>
00023
00024 <span class="keyword">using</span> <span class="keyword">namespace </span>std;
00025
00026 <span class="keyword">extern</span> Sym default_const();
00027
00028 <span class="keyword">class </span>LanguageImpl {
00029 <span class="keyword">public</span> :
00030 std::vector&lt;Sym&gt; vars;
00031 LanguageTable::erc_func erc;
00032
00033 std::vector&lt;functor_t&gt; functions;
00034 std::vector&lt; std::vector&lt;token_t&gt; &gt; functions_per_arity;
00035
00036 LanguageImpl() : erc(default_const) {}
00037 };
00038
00039 LanguageTable::LanguageTable() {
00040 pimpl = <span class="keyword">new</span> LanguageImpl;
00041 }
00042
00043 LanguageTable::~LanguageTable() {
00044 <span class="keyword">delete</span> pimpl;
00045 }
00046
00047 LanguageTable::LanguageTable(<span class="keyword">const</span> LanguageTable&amp; that) {
00048 pimpl = <span class="keyword">new</span> LanguageImpl(*that.pimpl);
00049 }
00050
00051 LanguageTable&amp; LanguageTable::operator=(<span class="keyword">const</span> LanguageTable&amp; that) {
00052 *pimpl = *that.pimpl;
00053 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
00054 }
00055
00056 <span class="keywordtype">void</span> LanguageTable::add_function(token_t token, <span class="keywordtype">unsigned</span> arity) {
00057 functor_t f = {token, arity};
00058 add_function( f );
00059 }
00060
00061 <span class="keywordtype">void</span> LanguageTable::add_function(functor_t f) {
00062
00063 <span class="keywordflow">if</span> (f.arity &gt; 0) {
00064 pimpl-&gt;functions.push_back(f);
00065
00066 } <span class="keywordflow">else</span> {
00067 pimpl-&gt;vars.push_back(Sym(f.token));
00068 }
00069
00070 <span class="keywordflow">if</span> (pimpl-&gt;functions_per_arity.size() &lt;= f.arity) pimpl-&gt;functions_per_arity.resize(f.arity+1);
00071 pimpl-&gt;functions_per_arity[f.arity].push_back(f.token);
00072
00073 }
00074
00075 <span class="keywordtype">void</span> LanguageTable::set_erc( erc_func func) { pimpl-&gt;erc = func; }
00076
00077 <span class="comment">/* Getting info out */</span>
00078
00079 <span class="keyword">extern</span> Sym SymConst(<span class="keywordtype">double</span> val);
00080
00081 Sym LanguageTable::get_random_var()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> rng.<a class="code" href="classeo_rng.html#a14">choice</a>(pimpl-&gt;vars); }
00082 Sym LanguageTable::get_random_const()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> pimpl-&gt;erc(); }
00083
00084 functor_t LanguageTable::get_random_function()<span class="keyword"> const </span>
00085 <span class="keyword"></span>{
00086 <span class="keywordflow">return</span> rng.<a class="code" href="classeo_rng.html#a14">choice</a>(pimpl-&gt;functions);
00087 }
00088
00089 token_t LanguageTable::get_random_function(token_t token, <span class="keywordtype">unsigned</span> arity)<span class="keyword"> const </span>
00090 <span class="keyword"></span>{
00091 <span class="keywordflow">if</span> (pimpl-&gt;functions_per_arity.size() &lt;= arity || pimpl-&gt;functions_per_arity[arity].empty()) {
00092 <span class="keywordflow">return</span> token; <span class="comment">// return original token if no functions of this arity are found</span>
00093 }
00094 <span class="keywordflow">return</span> rng.<a class="code" href="classeo_rng.html#a14">choice</a>(pimpl-&gt;functions_per_arity[arity]);
00095 }
00096
00097
00098
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