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