From 15c807ff344a5042604e83b975de4937ac7c309d Mon Sep 17 00:00:00 2001 From: Tianyi Liang Date: Thu, 9 Jan 2014 13:24:27 -0600 Subject: Another way to handle negative contain --- src/theory/strings/theory_strings.cpp | 28 +++++++++++----------------- 1 file changed, 11 insertions(+), 17 deletions(-) (limited to 'src/theory/strings') diff --git a/src/theory/strings/theory_strings.cpp b/src/theory/strings/theory_strings.cpp index 5f26b2f6a..ddc729e1e 100644 --- a/src/theory/strings/theory_strings.cpp +++ b/src/theory/strings/theory_strings.cpp @@ -1388,7 +1388,7 @@ bool TheoryStrings::isNormalFormPair2( Node n1, Node n2 ) { } void TheoryStrings::sendLemma( Node ant, Node conc, const char * c ) { - if( conc.isNull() || conc==d_false ){ + if( conc.isNull() ){ d_out->conflict(ant); Trace("strings-conflict") << "Strings::Conflict : " << ant << std::endl; d_conflict = true; @@ -2113,7 +2113,6 @@ bool TheoryStrings::checkInclusions() { Trace("strings-inc") << "... is satisfied." << std::endl; } } else { - //TODO: negative inclusion if( areEqual( atom[1], d_emptyString ) ) { Node ant = NodeManager::currentNM()->mkNode( kind::AND, assertion, atom[1].eqNode( d_emptyString ) ); Node conc = Node::null(); @@ -2125,21 +2124,16 @@ bool TheoryStrings::checkInclusions() { sendLemma( ant, conc, "inclusion conflict 2" ); addedLemma = true; } else { - if( getLogicInfo().isQuantified() ){ - if(d_str_ctn_rewritten.find(assertion) == d_str_ctn_rewritten.end()) { - Node b1 = NodeManager::currentNM()->mkBoundVar( atom[0].getType() ); - Node b2 = NodeManager::currentNM()->mkBoundVar( atom[0].getType() ); - Node bvar = NodeManager::currentNM()->mkNode( kind::BOUND_VAR_LIST, b1, b2 ); - Node conc = NodeManager::currentNM()->mkNode( kind::FORALL, bvar, - atom[0].eqNode( NodeManager::currentNM()->mkNode( kind::STRING_CONCAT, b1, atom[1], b2 ) ).negate() - ); - d_str_ctn_rewritten[ assertion ] = true; - sendLemma( assertion, conc, "negative inclusion" ); - addedLemma = true; - } - } else { - Trace("strings-inc") << "Inclusion is incomplete due to " << assertion << "." << std::endl; - is_unk = true; + if(d_str_ctn_rewritten.find(assertion) == d_str_ctn_rewritten.end()) { + Node x = atom[0]; + Node s = atom[1]; + Node sk1 = NodeManager::currentNM()->mkSkolem( "sc3_$$", s.getType(), "created for inclusion" ); + Node sk2 = NodeManager::currentNM()->mkSkolem( "sc4_$$", s.getType(), "created for inclusion" ); + Node eq = Rewriter::rewrite( x.eqNode( NodeManager::currentNM()->mkNode( kind::STRING_CONCAT, sk1, s, sk2 ) ) ); + Node antc = Rewriter::rewrite( NodeManager::currentNM()->mkNode( kind::AND, assertion, eq ) ); + d_str_ctn_rewritten[ assertion ] = true; + sendLemma( antc, d_false, "negative inclusion" ); + addedLemma = true; } } } -- cgit v1.2.3