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<div class="title">cnf.cpp</div> </div>
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<a href="cnf_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*****************************************************************************/</span><span class="comment"></span>
<a name="l00002"></a>00002 <span class="comment">/*!</span>
<a name="l00003"></a>00003 <span class="comment"> *\file cnf.cpp</span>
<a name="l00004"></a>00004 <span class="comment"> *\brief Implementation of classes used for generic CNF formulas</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * Author: Clark Barrett</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * Created: Mon Dec 12 22:16:11 2005</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * <hr></span>
<a name="l00011"></a>00011 <span class="comment"> *</span>
<a name="l00012"></a>00012 <span class="comment"> * License to use, copy, modify, sell and/or distribute this software</span>
<a name="l00013"></a>00013 <span class="comment"> * and its documentation for any purpose is hereby granted without</span>
<a name="l00014"></a>00014 <span class="comment"> * royalty, subject to the terms and conditions defined in the \ref</span>
<a name="l00015"></a>00015 <span class="comment"> * LICENSE file provided with this distribution.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * <hr></span>
<a name="l00018"></a>00018 <span class="comment"> */</span>
<a name="l00019"></a>00019 <span class="comment">/*****************************************************************************/</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include "<a class="code" href="cnf_8h.html" title="Basic classes for reasoning about formulas in CNF.">cnf.h</a>"</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="keyword">using namespace </span>std;
<a name="l00026"></a>00026 <span class="keyword">using namespace </span>CVC3;
<a name="l00027"></a>00027 <span class="keyword">using namespace </span>SAT;
<a name="l00028"></a>00028
<a name="l00029"></a>00029
<a name="l00030"></a><a class="code" href="classSAT_1_1Clause.html#a88bfd90868e75a24feffc7f428e30369">00030</a> <span class="keywordtype">unsigned</span> <a class="code" href="classSAT_1_1Clause.html#a88bfd90868e75a24feffc7f428e30369">SAT::Clause::getMaxVar</a>()<span class="keyword"> const</span>
<a name="l00031"></a>00031 <span class="keyword"></span>{
<a name="l00032"></a>00032 <span class="keywordtype">unsigned</span> <a class="code" href="namespaceCVC3.html#a03dcd07dcbd01da970af13f1dfc5e2dd">max</a> = 0;
<a name="l00033"></a>00033 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">const_iterator</a> i, iend;
<a name="l00034"></a>00034 <span class="keywordflow">for</span> (i = begin(), iend = end(); i != iend; ++i) {
<a name="l00035"></a>00035 <a class="code" href="debug_8h.html#a40dac3bdb2166ffc852ee8b1489d2b56">DebugAssert</a>(!(*i).isNull(), <span class="stringliteral">"Null literal found in clause"</span>);
<a name="l00036"></a>00036 <span class="keywordflow">if</span> (<span class="keywordtype">unsigned</span>((*i).getVar()) > max) max = unsigned((*i).getVar());
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038 <span class="keywordflow">return</span> <a class="code" href="namespaceCVC3.html#a03dcd07dcbd01da970af13f1dfc5e2dd">max</a>;
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="classSAT_1_1Clause.html#ad906b9b541550cffbf95b6ed3c68e6d4">00042</a> <span class="keywordtype">void</span> <a class="code" href="classSAT_1_1Clause.html#ad906b9b541550cffbf95b6ed3c68e6d4">SAT::Clause::print</a>()<span class="keyword"> const</span>
<a name="l00043"></a>00043 <span class="keyword"></span>{
<a name="l00044"></a>00044 <span class="keywordflow">if</span> (isSatisfied()) cout << <span class="stringliteral">"*"</span>;
<a name="l00045"></a>00045 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">const_iterator</a> i, iend;
<a name="l00046"></a>00046 <span class="keywordflow">for</span> (i = begin(), iend = end(); i != iend; ++i) {
<a name="l00047"></a>00047 <span class="keywordflow">if</span> ((*i).isNull()) cout << <span class="stringliteral">"NULL"</span>;
<a name="l00048"></a>00048 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*i).isFalse()) cout << <span class="stringliteral">"F"</span>;
<a name="l00049"></a>00049 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*i).isTrue()) cout << <span class="stringliteral">"T"</span>;
<a name="l00050"></a>00050 <span class="keywordflow">else</span> {
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (!(*i).isPositive()) cout << <span class="stringliteral">"-"</span>;
<a name="l00052"></a>00052 cout << (*i).getVar();
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 cout << <span class="stringliteral">" "</span>;
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 cout << <a class="code" href="group__ExprStream__Manip.html#ga05b0ea7353ec24fa8e7e272d7a7875d8" title="Print the end-of-line.">endl</a>;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00059"></a>00059
<a name="l00060"></a><a class="code" href="classSAT_1_1CNF__Formula.html#a9f9af9ad14a66890d4dbb001aa070dc3">00060</a> <span class="keywordtype">void</span> CNF_Formula::copy(<span class="keyword">const</span> <a class="code" href="classSAT_1_1CNF__Formula.html">CNF_Formula</a>& cnf)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 setNumVars(0);
<a name="l00063"></a>00063 <a class="code" href="classSAT_1_1Clause.html">Clause</a>* c = d_current;
<a name="l00064"></a>00064 <span class="comment">// Don't use iterators in case cnf == *this</span>
<a name="l00065"></a>00065 <span class="keywordtype">unsigned</span> i, iend;
<a name="l00066"></a>00066 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">Clause::const_iterator</a> j, jend;
<a name="l00067"></a>00067 <span class="keywordflow">for</span> (i = 0, iend = cnf.<a class="code" href="classSAT_1_1CNF__Formula.html#a78d99de58d45109256158d55e65bb96f">numClauses</a>(); i != iend; ++i) {
<a name="l00068"></a>00068 newClause();
<a name="l00069"></a>00069 <span class="keywordflow">for</span> (j = cnf[i].begin(), jend = cnf[i].end(); j != jend; ++j) {
<a name="l00070"></a>00070 addLiteral(*j);
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <a class="code" href="classSAT_1_1Clause.html">Clause</a> oldClause = cnf[i];
<a name="l00074"></a>00074 <span class="comment">// CVC3::Theorem clauseThm = oldClause.getClauseTheorem();</span>
<a name="l00075"></a>00075 <a class="code" href="classCVC3_1_1Theorem.html">CVC3::Theorem</a> clauseThm = cnf[i].getClauseTheorem();
<a name="l00076"></a>00076 getCurrentClause().setClauseTheorem(clauseThm);<span class="comment">//by yeting</span>
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="keywordflow">if</span> (cnf[i].isUnit()) registerUnit();
<a name="l00079"></a>00079 <span class="keywordflow">if</span> (&(cnf[i]) == cnf.<a class="code" href="classSAT_1_1CNF__Formula.html#ac638646a5ac87ff246e3d1d7278463f0">d_current</a>) c = d_current;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 d_current = c;
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084
<a name="l00085"></a><a class="code" href="classSAT_1_1CNF__Formula.html#a7d85ca3c21713ab64142ecda50bf8476">00085</a> <span class="keywordtype">void</span> CNF_Formula::print()<span class="keyword"> const</span>
<a name="l00086"></a>00086 <span class="keyword"></span>{
<a name="l00087"></a>00087 <a class="code" href="classSAT_1_1CNF__Formula.html#ac247d01a4cc1e5aab84294cb4c00ddbf">const_iterator</a> i, iend;
<a name="l00088"></a>00088 <span class="keywordflow">for</span> (i = begin(), iend = end(); i != iend; ++i) {
<a name="l00089"></a>00089 (*i).<a class="code" href="classSAT_1_1Clause.html#ad906b9b541550cffbf95b6ed3c68e6d4">print</a>();
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092
<a name="l00093"></a>00093
<a name="l00094"></a><a class="code" href="classSAT_1_1CNF__Formula.html#a77b5e97b49bc46d0eb7928c29a341a98">00094</a> <span class="keyword">const</span> <a class="code" href="classSAT_1_1CNF__Formula.html">CNF_Formula</a>& CNF_Formula::operator+=(<span class="keyword">const</span> <a class="code" href="classSAT_1_1CNF__Formula.html">CNF_Formula</a>& cnf)
<a name="l00095"></a>00095 {
<a name="l00096"></a>00096 <a class="code" href="classSAT_1_1Clause.html">Clause</a>* c = d_current;
<a name="l00097"></a>00097 <span class="comment">// Don't use iterators in case cnf == *this</span>
<a name="l00098"></a>00098 <span class="keywordtype">unsigned</span> i, iend;
<a name="l00099"></a>00099 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">Clause::const_iterator</a> j, jend;
<a name="l00100"></a>00100 <span class="keywordflow">for</span> (i = 0, iend = cnf.<a class="code" href="classSAT_1_1CNF__Formula.html#a78d99de58d45109256158d55e65bb96f">numClauses</a>(); i != iend; ++i) {
<a name="l00101"></a>00101 newClause();
<a name="l00102"></a>00102 <span class="keywordflow">for</span> (j = cnf[i].begin(), jend = cnf[i].end(); j != jend; ++j) {
<a name="l00103"></a>00103 addLiteral(*j);
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <a class="code" href="classSAT_1_1Clause.html">Clause</a> oldClause = cnf[i];
<a name="l00107"></a>00107 <a class="code" href="classCVC3_1_1Theorem.html">CVC3::Theorem</a> clauseThm = oldClause.<a class="code" href="classSAT_1_1Clause.html#aa4d692df8aaef4ea4c1c45af006c1301">getClauseTheorem</a>();
<a name="l00108"></a>00108 getCurrentClause().setClauseTheorem(clauseThm);<span class="comment">//by yeting</span>
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="keywordflow">if</span> (cnf[i].isUnit()) registerUnit();
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112 d_current = c;
<a name="l00113"></a>00113 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115
<a name="l00116"></a>00116
<a name="l00117"></a><a class="code" href="classSAT_1_1CNF__Formula.html#a357e48262bab170e434d52e4e2fa2a8d">00117</a> <span class="keyword">const</span> <a class="code" href="classSAT_1_1CNF__Formula.html">CNF_Formula</a>& CNF_Formula::operator+=(<span class="keyword">const</span> <a class="code" href="classSAT_1_1Clause.html">Clause</a>& c)
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 <a class="code" href="classSAT_1_1Clause.html">Clause</a>* cur = d_current;
<a name="l00120"></a>00120 newClause();
<a name="l00121"></a>00121 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">Clause::const_iterator</a> j, jend;
<a name="l00122"></a>00122 <span class="keywordflow">for</span> (j=c.<a class="code" href="classSAT_1_1Clause.html#a6d0f568c60e06a1c59c2bf37788ff778">begin</a>(), jend = c.<a class="code" href="classSAT_1_1Clause.html#a38094b009b923d08ca9b1a8f517b591e">end</a>(); j != jend; ++j) {
<a name="l00123"></a>00123 addLiteral(*j);
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <a class="code" href="classSAT_1_1Clause.html">Clause</a> oldClause = c;
<a name="l00127"></a>00127 <a class="code" href="classCVC3_1_1Theorem.html">CVC3::Theorem</a> clauseThm = oldClause.<a class="code" href="classSAT_1_1Clause.html#aa4d692df8aaef4ea4c1c45af006c1301">getClauseTheorem</a>();
<a name="l00128"></a>00128 getCurrentClause().setClauseTheorem(clauseThm);<span class="comment">//by yeting</span>
<a name="l00129"></a>00129
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="keywordflow">if</span> (c.<a class="code" href="classSAT_1_1Clause.html#abcf5873b0dcc37651c1af59c610a13a9">isUnit</a>()) registerUnit();
<a name="l00132"></a>00132 d_current = cur;
<a name="l00133"></a>00133 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135
<a name="l00136"></a>00136
<a name="l00137"></a><a class="code" href="classSAT_1_1CNF__Formula__Impl.html#adffd09ad005d74fdad1be0fc80727767">00137</a> <span class="keywordtype">void</span> CNF_Formula_Impl::newClause()
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 d_formula.resize(d_formula.size()+1);
<a name="l00140"></a>00140 d_current = &(d_formula.back());
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142
<a name="l00143"></a>00143
<a name="l00144"></a><a class="code" href="classSAT_1_1CNF__Formula__Impl.html#ab72a764586f913bc1aa45e0334a75140">00144</a> <span class="keywordtype">void</span> CNF_Formula_Impl::registerUnit()
<a name="l00145"></a>00145 {
<a name="l00146"></a>00146 <a class="code" href="debug_8h.html#a40dac3bdb2166ffc852ee8b1489d2b56">DebugAssert</a>(d_current->size()==1,<span class="stringliteral">"Expected unit clause"</span>);
<a name="l00147"></a>00147 d_current->setUnit();
<a name="l00148"></a>00148 <a class="code" href="classSAT_1_1Lit.html">Lit</a> l = *(d_current->begin());
<a name="l00149"></a>00149 d_lits[l.<a class="code" href="classSAT_1_1Lit.html#a744e350c39286a2ea093c3c5f1d083a4">getID</a>()] = <span class="keyword">true</span>;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152
<a name="l00153"></a><a class="code" href="classSAT_1_1CNF__Formula__Impl.html#ad4e85285d108ed917b748e09c356aa7d">00153</a> <span class="keywordtype">void</span> CNF_Formula_Impl::simplify()
<a name="l00154"></a>00154 {
<a name="l00155"></a>00155 deque<Clause>::iterator i, iend;
<a name="l00156"></a>00156 <a class="code" href="classSAT_1_1Clause.html#af739bca890fe8219a7ebda3beefb0474">Clause::const_iterator</a> j, jend;
<a name="l00157"></a>00157 <span class="keywordflow">for</span> (i = d_formula.begin(), iend = d_formula.end(); i != iend; ++i) {
<a name="l00158"></a>00158 <span class="keywordflow">if</span> ((*i).isUnit()) <span class="keywordflow">continue</span>;
<a name="l00159"></a>00159 <span class="keywordflow">for</span> (j=(*i).begin(), jend = (*i).end(); j != jend; ++j) {
<a name="l00160"></a>00160 <span class="keywordflow">if</span> ((*j).isTrue()) {
<a name="l00161"></a>00161 (*i).setSatisfied();
<a name="l00162"></a>00162 <span class="keywordflow">break</span>;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 <a class="code" href="classHash_1_1hash__map.html">hash_map<int, bool>::iterator</a> it = d_lits.<a class="code" href="classHash_1_1hash__map.html#af3317f9087a35d09985b6513c45d2ab8" title="operations">find</a>((*j).getID());
<a name="l00165"></a>00165 <span class="keywordflow">if</span> (it != d_lits.<a class="code" href="classHash_1_1hash__map.html#a2c776e055f3d17226605157e1c37dbc9">end</a>()) {
<a name="l00166"></a>00166 (*i).setSatisfied();
<a name="l00167"></a>00167 <span class="keywordflow">break</span>;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 }
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173
<a name="l00174"></a><a class="code" href="classSAT_1_1CNF__Formula__Impl.html#a6bc99606944e873ded2b37c954b18170">00174</a> <span class="keywordtype">void</span> <a class="code" href="group__ExprStream__Manip.html#ga90deb7348703ae1a59a11d9af77aa8ad" title="Reset the indentation to the default at this level.">CNF_Formula_Impl::reset</a>()
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176 d_formula.clear();
<a name="l00177"></a>00177 d_lits.clear();
<a name="l00178"></a>00178 d_current = NULL;
<a name="l00179"></a>00179 d_numVars = 0;
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181
<a name="l00182"></a>00182
<a name="l00183"></a><a class="code" href="classSAT_1_1CD__CNF__Formula.html#a9ef7d443b6dddb0f23fd07e81a60970c">00183</a> <span class="keywordtype">void</span> CD_CNF_Formula::newClause()
<a name="l00184"></a>00184 {
<a name="l00185"></a>00185 <span class="comment">//TODO: don't call constructor twice</span>
<a name="l00186"></a>00186 d_current = &(d_formula.push_back(<a class="code" href="classSAT_1_1Clause.html">Clause</a>()));
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00189"></a>00189
<a name="l00190"></a><a class="code" href="classSAT_1_1CD__CNF__Formula.html#a41c4e53bdf4c9d98afbdbea4a735fce9">00190</a> <span class="keywordtype">void</span> CD_CNF_Formula::registerUnit()
<a name="l00191"></a>00191 {
<a name="l00192"></a>00192 <a class="code" href="debug_8h.html#a40dac3bdb2166ffc852ee8b1489d2b56">DebugAssert</a>(d_current->size()==1,<span class="stringliteral">"Expected unit clause"</span>);
<a name="l00193"></a>00193 d_current->setUnit();
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195
<a name="l00196"></a>00196
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