bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/CHRRule.java

   1 package org.simantics.scl.compiler.elaboration.chr;
   2
   3 import java.util.ArrayList;
   4
   5 import org.junit.runners.ParentRunner;
   6 import org.simantics.scl.compiler.compilation.CompilationContext;
   7 import org.simantics.scl.compiler.elaboration.chr.plan.CHRSearchPlan;
   8 import org.simantics.scl.compiler.elaboration.chr.planning.QueryPlanningContext;
   9 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
  10 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
  11 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
  12 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
  13 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
  14 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  15 import org.simantics.scl.compiler.elaboration.expressions.VariableProcedure;
  16 import org.simantics.scl.compiler.elaboration.expressions.printing.ExpressionToStringVisitor;
  17 import org.simantics.scl.compiler.errors.Locations;
  18 import org.simantics.scl.compiler.internal.parsing.Symbol;
  19 import org.simantics.scl.compiler.types.Types;
  20 import org.simantics.scl.compiler.types.kinds.Kinds;
  21
  22 import gnu.trove.map.hash.TObjectIntHashMap;
  23 import gnu.trove.set.hash.THashSet;
  24 import gnu.trove.set.hash.TIntHashSet;
  25
  26 public class CHRRule extends Symbol {
  27     public int priority;
  28     public CHRQuery head;
  29     public CHRQuery body;
  30     public Variable[] existentialVariables;
  31
  32     // Analysis
  33     //public int firstPriorityExecuted;
  34     public int lastPriorityExecuted;
  35
  36     // Plans
  37     public ArrayList<CHRSearchPlan> plans = new ArrayList<CHRSearchPlan>();
  38
  39     // Code generation, move to CHRPriority
  40     public String containerClassName;
  41
  42     public CHRRule(long location, CHRQuery head, CHRQuery body, Variable[] existentialVariables) {
  43         this.location = location;
  44         this.head = head;
  45         this.body = body;
  46         this.existentialVariables = existentialVariables;
  47     }
  48
  49     public void resolve(TranslationContext context) {
  50         context.pushExistentialFrame();
  51         head.resolve(context);
  52         body.resolve(context);
  53         existentialVariables = context.popExistentialFrame();
  54     }
  55
  56     public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
  57         head.collectRefs(allRefs, refs);
  58         body.collectRefs(allRefs, refs);
  59     }
  60
  61     public void checkType(TypingContext context) {
  62         for(Variable variable : existentialVariables)
  63             variable.setType(Types.metaVar(Kinds.STAR));
  64         head.checkType(context);
  65         body.checkType(context);
  66     }
  67
  68     public void collectVars(TObjectIntHashMap<Variable> allVars, TIntHashSet vars) {
  69         head.collectVars(allVars, vars);
  70         body.collectVars(allVars, vars);
  71     }
  72
  73     public void forVariables(VariableProcedure procedure) {
  74         head.forVariables(procedure);
  75         body.forVariables(procedure);
  76     }
  77
  78     public void collectFreeVariables(THashSet<Variable> vars) {
  79         head.collectFreeVariables(vars);
  80         body.collectFreeVariables(vars);
  81     }
  82
  83     public void setLocationDeep(long loc) {
  84         if(location == Locations.NO_LOCATION) {
  85             this.location = loc;
  86             head.setLocationDeep(loc);
  87             body.setLocationDeep(loc);
  88         }
  89     }
  90
  91     public void simplify(SimplificationContext context) {
  92         head.simplify(context);
  93         body.simplify(context);
  94     }
  95
  96     public void compile(CompilationContext compilationContext, CHRConstraint initConstraint) {
  97         boolean hasActiveLiteral = false;
  98         for(int i=0;i<head.literals.length;++i) {
  99             CHRLiteral literal = head.literals[i];
 100             if(literal.passive)
 101                 continue;
 102             CHRConstraint constraint = (CHRConstraint)literal.relation;
 103
 104             Variable activeFact = new Variable("activeFact", constraint.factType);
 105             QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
 106             if(!head.createQueryPlan(context, new EVariable(activeFact), i))
 107                 return;
 108             body.createEnforcePlan(context, priority);
 109             addPlan(new CHRSearchPlan(constraint, activeFact, context.getPlanOps()));
 110
 111             hasActiveLiteral = true;
 112         }
 113         if(!hasActiveLiteral) {
 114             Variable activeFact = new Variable("activeFact", initConstraint.factType);
 115             QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
 116             if(!head.createQueryPlan(context, null, -1))
 117                 return;
 118             body.createEnforcePlan(context, priority);
 119             /*System.out.println(this);
 120             for(PlanOp planOp : context.getPlanOps())
 121                 System.out.println("    " + planOp);*/
 122             addPlan(new CHRSearchPlan(initConstraint, activeFact, context.getPlanOps()));
 123         }
 124     }
 125
 126     private void addPlan(CHRSearchPlan plan) {
 127         plans.add(plan);
 128     }
 129
 130     public String toString() {
 131         StringBuilder b = new StringBuilder();
 132         ExpressionToStringVisitor visitor = new ExpressionToStringVisitor(b);
 133         visitor.visit(this);
 134         return b.toString();
 135     }
 136
 137 }