1 package org.simantics.scl.compiler.elaboration.chr;
3 import org.simantics.scl.compiler.compilation.CompilationContext;
4 import org.simantics.scl.compiler.elaboration.chr.plan.PlanOp;
5 import org.simantics.scl.compiler.elaboration.chr.plan.PrioritizedPlan;
6 import org.simantics.scl.compiler.elaboration.chr.planning.QueryPlanningContext;
7 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
8 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
9 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
10 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
11 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
12 import org.simantics.scl.compiler.elaboration.expressions.Variable;
13 import org.simantics.scl.compiler.elaboration.expressions.VariableProcedure;
14 import org.simantics.scl.compiler.elaboration.expressions.printing.ExpressionToStringVisitor;
15 import org.simantics.scl.compiler.errors.Locations;
16 import org.simantics.scl.compiler.internal.parsing.Symbol;
17 import org.simantics.scl.compiler.types.Types;
18 import org.simantics.scl.compiler.types.kinds.Kinds;
20 import gnu.trove.map.hash.TObjectIntHashMap;
21 import gnu.trove.set.hash.THashSet;
22 import gnu.trove.set.hash.TIntHashSet;
24 public class CHRRule extends Symbol {
28 public Variable[] existentialVariables;
31 public int firstPriorityExecuted;
32 public int lastPriorityExecuted;
34 public CHRRule(long location, CHRQuery head, CHRQuery body, Variable[] existentialVariables) {
35 this.location = location;
38 this.existentialVariables = existentialVariables;
41 public void resolve(TranslationContext context) {
42 context.pushExistentialFrame();
43 head.resolve(context);
44 body.resolve(context);
45 existentialVariables = context.popExistentialFrame();
48 public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
49 head.collectRefs(allRefs, refs);
50 body.collectRefs(allRefs, refs);
53 public void checkType(TypingContext context) {
54 for(Variable variable : existentialVariables)
55 variable.setType(Types.metaVar(Kinds.STAR));
56 head.checkType(context);
57 body.checkType(context);
60 public void collectVars(TObjectIntHashMap<Variable> allVars, TIntHashSet vars) {
61 head.collectVars(allVars, vars);
62 body.collectVars(allVars, vars);
65 public void forVariables(VariableProcedure procedure) {
66 head.forVariables(procedure);
67 body.forVariables(procedure);
70 public void collectFreeVariables(THashSet<Variable> vars) {
71 head.collectFreeVariables(vars);
72 body.collectFreeVariables(vars);
75 public void setLocationDeep(long loc) {
76 if(location == Locations.NO_LOCATION) {
78 head.setLocationDeep(loc);
79 body.setLocationDeep(loc);
83 public void simplify(SimplificationContext context) {
84 head.simplify(context);
85 body.simplify(context);
88 public void compile(CompilationContext compilationContext, CHRConstraint initConstraint) {
89 boolean hasActiveLiteral = false;
90 for(int i=0;i<head.literals.length;++i) {
91 CHRLiteral literal = head.literals[i];
94 CHRConstraint constraint = (CHRConstraint)literal.relation;
96 Variable activeFact = new Variable("activeFact", constraint.factType);
97 QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
98 if(!head.createQueryPlan(context, new EVariable(activeFact), i))
100 body.createEnforcePlan(context, priority);
101 constraint.plans.add(new PrioritizedPlan(priority, activeFact, context.getPlanOps()));
103 hasActiveLiteral = true;
105 if(!hasActiveLiteral) {
106 Variable activeFact = new Variable("activeFact", initConstraint.factType);
107 QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
108 if(!head.createQueryPlan(context, null, -1))
110 body.createEnforcePlan(context, priority);
111 /*System.out.println(this);
112 for(PlanOp planOp : context.getPlanOps())
113 System.out.println(" " + planOp);*/
114 initConstraint.plans.add(new PrioritizedPlan(priority, activeFact, context.getPlanOps()));
118 public String toString() {
119 StringBuilder b = new StringBuilder();
120 ExpressionToStringVisitor visitor = new ExpressionToStringVisitor(b);