-/*
-Edge simplifyCNF(CNF *cnf, Edge input) {
- if (edgeIsVarConst(input)) {
- Node *newvec = allocResizeNode(1);
- addEdgeToResizeNode(&newvec, input);
- return (Edge) {newvec};
- }
- bool negated = isNegEdge(input);
- Node * node = getNodePtrFromEdge(input);
- NodeType type = node->type;
- if (!negated) {
- if (type == NodeType_AND) {
- //AND case
- Node *newvec = allocResizeNode(node->numEdges);
- uint numEdges = node->numEdges;
- for(uint i = 0; i < numEdges; i++) {
- Edge e = simplifyCNF(cnf, node->edges[i]);
- mergeFreeNodeToResizeNode(&newvec, e.node_ptr);
- }
- return (Edge) {newvec};
- } else {
- Edge cond = node->edges[0];
- Edge thenedge = node->edges[1];
- Edge elseedge = (type == NodeType_IFF) ? constraintNegate(thenedge) : node->edges[2];
- Edge thenedges[] = {cond, constraintNegate(thenedge)};
- Edge thencons = constraintNegate(createNode(NodeType_AND, 2, thenedges));
- Edge elseedges[] = {constraintNegate(cond), constraintNegate(elseedge)};
- Edge elsecons = constraintNegate(createNode(NodeType_AND, 2, elseedges));
- Edge thencnf = simplifyCNF(cnf, thencons);
- Edge elsecnf = simplifyCNF(cnf, elsecons);
- //free temporary nodes
- ourfree(getNodePtrFromEdge(thencons));
- ourfree(getNodePtrFromEdge(elsecons));
- Node * result = thencnf.node_ptr;
- mergeFreeNodeToResizeNode(&result, elsecnf.node_ptr);
- return (Edge) {result};
- }
- } else {
- if (type == NodeType_AND) {
- //OR Case
- uint numEdges = node->numEdges;
-
- for(uint i = 0; i < numEdges; i++) {
- Edge e = node->edges[i];
- bool enegate = isNegEdge(e);
- if (!edgeIsVarConst(e)) {
- Node * enode = getNodePtrFromEdge(e);
- NodeType etype = enode->type;
- if (enegate) {
- if (etype == NodeType_AND) {
- //OR of AND Case
- uint eNumEdges = enode->numEdges;
- Node * newnode = allocResizeNode(0);
- Node * clause = allocBaseNode(NodeType_AND, numEdges);
- memcpy(clause->edges, node->edges, sizeof(Edge) * i);
- if ((i + 1) < numEdges) {
- memcpy(&clause->edges[i+1], &node->edges[i+1], sizeof(Edge) * (numEdges - i - 1));
- }
-
- for(uint j = 0; j < eNumEdges; j++) {
- clause->edges[i] = constraintNegate(enode->edges[j]);
- Edge simplify = simplifyCNF(cnf, constraintNegate((Edge){clause}));
- mergeFreeNodeToResizeNode(&newnode, simplify.node_ptr);
- }
- ourfree(clause);
- return (Edge) {newnode};
- } else {
- //OR of IFF or ITE
- Edge cond = enode->edges[0];
- Edge thenedge = enode->edges[1];
- Edge elseedge = (enode->type == NodeType_IFF) ? constraintNegate(thenedge) : enode->edges[2];
- Edge thenedges[] = {cond, constraintNegate(thenedge)};
- Edge thencons = constraintNegate(createNode(NodeType_AND, 2, thenedges));
- Edge elseedges[] = {constraintNegate(cond), constraintNegate(elseedge)};
- Edge elsecons = constraintNegate(createNode(NodeType_AND, 2, elseedges));
-
- //OR of AND Case
- Node * newnode = allocResizeNode(0);
- Node * clause = allocBaseNode(NodeType_AND, numEdges);
- memcpy(clause->edges, node->edges, sizeof(Edge) * i);
- if ((i + 1) < numEdges) {
- memcpy(&clause->edges[i+1], &node->edges[i+1], sizeof(Edge) * (numEdges - i - 1));
- }
-
- clause->edges[i] = constraintNegate(thencons);
- Edge simplify = simplifyCNF(cnf, constraintNegate((Edge){clause}));
- mergeFreeNodeToResizeNode(&newnode, simplify.node_ptr);
-
- clause->edges[i] = constraintNegate(elsecons);
- simplify = simplifyCNF(cnf, constraintNegate((Edge){clause}));
- mergeFreeNodeToResizeNode(&newnode, simplify.node_ptr);
-
- //free temporary nodes
- ourfree(getNodePtrFromEdge(thencons));
- ourfree(getNodePtrFromEdge(elsecons));
- ourfree(clause);
- return (Edge) {newnode};
- }
- } else {
- if (etype == NodeType_AND) {
- //OR of OR Case
- uint eNumEdges = enode->numEdges;
- Node * clause = allocBaseNode(NodeType_AND, eNumEdges + numEdges - 1);
- memcpy(clause->edges, node->edges, sizeof(Edge) * i);
- if ((i + 1) < numEdges) {
- memcpy(&clause->edges[i], &node->edges[i+1], sizeof(Edge) * (numEdges - i - 1));
- }
- memcpy(&clause->edges[numEdges-1], enode->edges, sizeof(Edge) * eNumEdges);
- Edge eclause = {clause};
- Edge result = simplifyCNF(cnf, constraintNegate(eclause));
- ourfree(clause);
- return result;
- } else {
- //OR of !(IFF or ITE)
- Edge cond = node->edges[0];
- Edge thenedge = node->edges[1];
- Edge elseedge = (type == NodeType_IFF) ? constraintNegate(thenedge) : node->edges[2];
- Edge thenedges[] = {cond, constraintNegate(thenedge)};
- Edge thencons = createNode(NodeType_AND, 2, thenedges);
- Edge elseedges[] = {constraintNegate(cond), constraintNegate(elseedge)};
- Edge elsecons = createNode(NodeType_AND, 2, elseedges);
-
-
- Node * clause = allocBaseNode(NodeType_AND, numEdges + 1);
- memcpy(clause->edges, node->edges, sizeof(Edge) * i);
- if ((i + 1) < numEdges) {
- memcpy(&clause->edges[i], &node->edges[i+1], sizeof(Edge) * (numEdges - i - 1));
- }
- clause->edges[numEdges-1] = constraintNegate(thencons);
- clause->edges[numEdges] = constraintNegate(elsecons);
- Edge result = simplifyCNF(cnf, constraintNegate((Edge) {clause}));
- //free temporary nodes
- ourfree(getNodePtrFromEdge(thencons));
- ourfree(getNodePtrFromEdge(elsecons));
- ourfree(clause);
- return result;
- }
- }
- }
- }
-
- Node *newvec = allocResizeNode(numEdges);
- for(uint i=0; i < numEdges; i++) {
- addEdgeToResizeNode(&newvec, constraintNegate(node->edges[i]));
- }
- Node * result = allocResizeNode(1);
- addEdgeToResizeNode(&result, (Edge){newvec});
- return (Edge) {result};
- } else {
- Edge cond = node->edges[0];
- Edge thenedge = node->edges[1];
- Edge elseedge = (type == NodeType_IFF) ? constraintNegate(thenedge) : node->edges[2];
-
-
- Edge thenedges[] = {cond, constraintNegate(thenedge)};
- Edge thencons = createNode(NodeType_AND, 2, thenedges);
- Edge elseedges[] = {constraintNegate(cond), constraintNegate(elseedge)};
- Edge elsecons = createNode(NodeType_AND, 2, elseedges);
-
- Edge combinededges[] = {constraintNegate(thencons), constraintNegate(elsecons)};
- Edge combined = constraintNegate(createNode(NodeType_AND, 2, combinededges));
- Edge result = simplifyCNF(cnf, combined);
- //free temporary nodes
- ourfree(getNodePtrFromEdge(thencons));
- ourfree(getNodePtrFromEdge(elsecons));
- ourfree(getNodePtrFromEdge(combined));
- return result;
- }
- }