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<a class="el" href="dir_000007.html">contrib</a>&nbsp;/&nbsp;<a class="el" href="dir_000008.html">mathsym</a>&nbsp;/&nbsp;<a class="el" href="dir_000028.html">sym</a></div>
<h1>Sym.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 <span class="preprocessor">#include &lt;sstream&gt;</span>
00019 <span class="preprocessor">#include &lt;vector&gt;</span>
00020
00021 <span class="preprocessor">#include "Sym.h"</span>
00022
00023 <span class="keyword">using</span> <span class="keyword">namespace </span>std;
00024
00025 <span class="keyword">typedef</span> UniqueNodeStats* (*NodeStatFunc)(Sym&amp;);
00026
00027 UniqueNodeStats* (*Sym::factory)(<span class="keyword">const</span> Sym&amp;) = 0;
00028
00029 SymMap Sym::dag(100000); <span class="comment">// reserve space for so many nodes</span>
00030 std::vector&lt;unsigned&gt; Sym::token_count;
00031
00032
00033 size_t get_size(<span class="keyword">const</span> SymVec&amp; vec) {
00034 size_t sz = 0;
00035 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; vec.size(); ++i) {
00036 sz += vec[i].size();
00037 }
00038 <span class="keywordflow">return</span> sz;
00039 }
00040
00041 size_t get_depth(<span class="keyword">const</span> SymVec&amp; vec) {
00042 size_t dp = 1;
00043 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; vec.size(); ++i) {
00044 dp = std::max(dp, vec[i].depth());
00045 }
00046 <span class="keywordflow">return</span> dp;
00047 }
00048
00049 Sym::Sym(token_t tok, <span class="keyword">const</span> SymVec&amp; args_) : node(dag.end())
00050 {
00051 detail::SymKey key(tok, detail::SymArgs(args_));
00052 detail::SymValue val;
00053
00054 node = dag.insert(pair&lt;const detail::SymKey, detail::SymValue&gt;(key, val)).first;
00055
00056 <span class="keywordflow">if</span> (__unchecked_refcount() == 0) { <span class="comment">// new node, set some stats </span>
00057 node-&gt;second.size = 1 + get_size(args_);
00058 node-&gt;second.depth = 1 + get_depth(args_);
00059
00060 <span class="comment">// token count</span>
00061 <span class="keywordflow">if</span> (tok &gt;= token_count.size()) {
00062 token_count.resize(tok+1);
00063 }
00064
00065 incref();
00066 node-&gt;first.fixate();
00067 <span class="comment">// call the factory function if available</span>
00068 <span class="keywordflow">if</span> (factory) node-&gt;second.uniqueNodeStats = factory(*<span class="keyword">this</span>);
00069
00070 }
00071 <span class="keywordflow">else</span> incref();
00072 }
00073
00074 Sym::Sym(token_t tok, <span class="keyword">const</span> Sym&amp; a) : node(dag.end()) {
00075 SymVec args_; args_.push_back(a);
00076 detail::SymKey key(tok, detail::SymArgs(args_));
00077 detail::SymValue val;
00078
00079 node = dag.insert(pair&lt;const detail::SymKey, detail::SymValue&gt;(key, val)).first;
00080
00081 <span class="keywordflow">if</span> (__unchecked_refcount() == 0) { <span class="comment">// new node, set some stats </span>
00082 node-&gt;second.size = 1 + get_size(args_);
00083 node-&gt;second.depth = 1 + get_depth(args_);
00084
00085 <span class="comment">// token count</span>
00086 <span class="keywordflow">if</span> (tok &gt;= token_count.size()) {
00087 token_count.resize(tok+1);
00088 }
00089
00090 incref();
00091 node-&gt;first.fixate();
00092 <span class="comment">// call the factory function if available</span>
00093 <span class="keywordflow">if</span> (factory) node-&gt;second.uniqueNodeStats = factory(*<span class="keyword">this</span>);
00094 }
00095 <span class="keywordflow">else</span> incref();
00096 }
00097
00098 Sym::Sym(token_t tok) : node(dag.end()) {
00099 detail::SymKey key(tok);
00100 detail::SymValue val;
00101 node = dag.insert(pair&lt;const detail::SymKey, detail::SymValue&gt;(key, val)).first;
00102
00103 <span class="keywordflow">if</span> (__unchecked_refcount() == 0) { <span class="comment">// new node, set some stats </span>
00104 node-&gt;second.size = 1;
00105 node-&gt;second.depth = 1;
00106
00107 <span class="comment">// token count</span>
00108 <span class="keywordflow">if</span> (tok &gt;= token_count.size()) {
00109 token_count.resize(tok+1);
00110 }
00111
00112 incref();
00113
00114 <span class="comment">// call the factory function if available</span>
00115 <span class="keywordflow">if</span> (factory) node-&gt;second.uniqueNodeStats = factory(*<span class="keyword">this</span>);
00116
00117 }
00118 <span class="keywordflow">else</span> incref();
00119 }
00120
00121 std::pair&lt;Sym,bool&gt; insert_subtree_impl(<span class="keyword">const</span> Sym&amp; cur, size_t w, <span class="keyword">const</span> Sym&amp; nw) {
00122 <span class="keywordflow">if</span> (w-- == 0) <span class="keywordflow">return</span> make_pair(nw, !(nw == cur));
00123
00124 <span class="keyword">const</span> SymVec&amp; vec = cur.args();
00125 std::pair&lt;Sym,bool&gt; result;
00126 <span class="keywordtype">unsigned</span> i;
00127
00128 <span class="keywordflow">for</span> (i = 0; i &lt; vec.size(); ++i) {
00129 <span class="keywordflow">if</span> (w &lt; vec[i].size()) {
00130 result = insert_subtree_impl(vec[i], w, nw);
00131 <span class="keywordflow">if</span> (result.second == <span class="keyword">false</span>) <span class="keywordflow">return</span> std::make_pair(cur, <span class="keyword">false</span>); <span class="comment">// unchanged</span>
00132 <span class="keywordflow">break</span>;
00133 }
00134 w -= vec[i].size();
00135 }
00136 SymVec newvec = cur.args();
00137 newvec[i] = result.first;
00138 <span class="keywordflow">return</span> make_pair(Sym(cur.token(), newvec), <span class="keyword">true</span>);
00139 }
00140
00141 Sym insert_subtree(<span class="keyword">const</span> Sym&amp; cur, size_t w, <span class="keyword">const</span> Sym&amp; nw) {
00142 <span class="keywordflow">return</span> insert_subtree_impl(cur,w,nw).first;
00143 }
00144 Sym get_subtree(<span class="keyword">const</span> Sym&amp; cur, size_t w) {
00145 <span class="keywordflow">if</span> (w-- == 0) <span class="keywordflow">return</span> cur;
00146
00147 <span class="keyword">const</span> SymVec&amp; vec = cur.args();
00148 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; vec.size(); ++i) {
00149 <span class="keywordflow">if</span> (w &lt; vec[i].size()) <span class="keywordflow">return</span> get_subtree(vec[i], w);
00150 w-=vec[i].size();
00151 }
00152 <span class="keywordflow">return</span> cur;
00153 }
00154
00155
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