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.simantics.scl.compiler.compilation.CompilationContext;
   6 import org.simantics.scl.compiler.elaboration.chr.plan.CHRSearchPlan;
   7 import org.simantics.scl.compiler.elaboration.chr.planning.QueryPlanningContext;
   8 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
   9 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
  10 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
  11 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
  12 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
  13 import org.simantics.scl.compiler.elaboration.expressions.Variable;
  14 import org.simantics.scl.compiler.elaboration.expressions.VariableProcedure;
  15 import org.simantics.scl.compiler.elaboration.expressions.printing.ExpressionToStringVisitor;
  16 import org.simantics.scl.compiler.errors.Locations;
  17 import org.simantics.scl.compiler.internal.parsing.Symbol;
  18 import org.simantics.scl.compiler.types.Types;
  19 import org.simantics.scl.compiler.types.kinds.Kinds;
  20
  21 import gnu.trove.map.hash.TObjectIntHashMap;
  22 import gnu.trove.set.hash.THashSet;
  23 import gnu.trove.set.hash.TIntHashSet;
  24
  25 public class CHRRule extends Symbol {
  26     public CHRRuleset parentRuleset;
  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         context.disallowNewExistentials();
  53         body.resolve(context);
  54         existentialVariables = context.popExistentialFrame();
  55     }
  56
  57     public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {
  58         head.collectRefs(allRefs, refs);
  59         body.collectRefs(allRefs, refs);
  60     }
  61
  62     public void checkType(TypingContext context) {
  63         for(Variable variable : existentialVariables)
  64             variable.setType(Types.metaVar(Kinds.STAR));
  65         head.checkType(context);
  66         body.checkType(context);
  67     }
  68
  69     public void collectVars(TObjectIntHashMap<Variable> allVars, TIntHashSet vars) {
  70         head.collectVars(allVars, vars);
  71         body.collectVars(allVars, vars);
  72     }
  73
  74     public void forVariables(VariableProcedure procedure) {
  75         head.forVariables(procedure);
  76         body.forVariables(procedure);
  77     }
  78
  79     public void collectFreeVariables(THashSet<Variable> vars) {
  80         head.collectFreeVariables(vars);
  81         body.collectFreeVariables(vars);
  82     }
  83
  84     public void setLocationDeep(long loc) {
  85         if(location == Locations.NO_LOCATION) {
  86             this.location = loc;
  87             head.setLocationDeep(loc);
  88             body.setLocationDeep(loc);
  89         }
  90     }
  91
  92     public void simplify(SimplificationContext context) {
  93         head.simplify(context);
  94         body.simplify(context);
  95     }
  96
  97     public void compile(CompilationContext compilationContext, CHRConstraint initConstraint) {
  98         boolean hasLocalActiveLiteral = false;
  99         for(int i=0;i<head.literals.length;++i) {
 100             CHRLiteral literal = head.literals[i];
 101             if(literal.passive)
 102                 continue;
 103             CHRConstraint constraint = (CHRConstraint)literal.relation;
 104
 105             Variable activeFact = new Variable("activeFact", constraint.factType);
 106             QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
 107             if(!head.createQueryPlan(context, new EVariable(activeFact), i))
 108                 return;
 109             body.createEnforcePlan(context, priority);
 110             addPlan(new CHRSearchPlan(constraint, activeFact, context.getPlanOps()));
 111
 112             if(constraint.parentRuleset == parentRuleset)
 113                 hasLocalActiveLiteral = true;
 114         }
 115         if(!hasLocalActiveLiteral) {
 116             Variable activeFact = new Variable("activeFact", initConstraint.factType);
 117             QueryPlanningContext context = new QueryPlanningContext(compilationContext, existentialVariables);
 118             if(!head.createQueryPlan(context, null, -1))
 119                 return;
 120             body.createEnforcePlan(context, priority);
 121             /*System.out.println(this);
 122             for(PlanOp planOp : context.getPlanOps())
 123                 System.out.println("    " + planOp);*/
 124             addPlan(new CHRSearchPlan(initConstraint, activeFact, context.getPlanOps()));
 125         }
 126     }
 127
 128     private void addPlan(CHRSearchPlan plan) {
 129         plans.add(plan);
 130     }
 131
 132     public String toString() {
 133         StringBuilder b = new StringBuilder();
 134         ExpressionToStringVisitor visitor = new ExpressionToStringVisitor(b);
 135         visitor.visit(this);
 136         return b.toString();
 137     }
 138
 139 }