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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/plan/PlanContext.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/plan/PlanContext.java
new file mode 100644
index 000000000..48ecc7b17
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/plan/PlanContext.java
@@ -0,0 +1,71 @@
+package org.simantics.scl.compiler.elaboration.chr.plan;
+
+import java.util.ArrayList;
+
+import org.simantics.scl.compiler.compilation.CompilationContext;
+import org.simantics.scl.compiler.constants.IntegerConstant;
+import org.simantics.scl.compiler.constants.JavaComparisonOperation;
+import org.simantics.scl.compiler.constants.singletons.IncreaseByOne;
+import org.simantics.scl.compiler.constants.singletons.ListElement;
+import org.simantics.scl.compiler.constants.singletons.ListLength;
+import org.simantics.scl.compiler.elaboration.chr.CHRRuleset;
+import org.simantics.scl.compiler.elaboration.expressions.Variable;
+import org.simantics.scl.compiler.internal.codegen.continuations.ICont;
+import org.simantics.scl.compiler.internal.codegen.references.IVal;
+import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+
+public abstract class PlanContext {
+    public CompilationContext context;
+    public CHRRuleset ruleset;
+    public IVal storeVar;
+    public ArrayList<PartnerFact> partnerFacts = new ArrayList<PartnerFact>();
+    public IVal currentId;
+    
+    public PlanContext(CompilationContext context, CHRRuleset ruleset, IVal storeVar) {
+        this.context = context;
+        this.ruleset = ruleset;
+        this.storeVar = storeVar;
+    }
+
+    public abstract void nextOp(CodeWriter w);
+
+    public IVal generateNewId(long location, CodeWriter w) {
+        if(currentId == null)
+            currentId = w.apply(location, ruleset.readCurrentId, storeVar);
+        IVal result = currentId;
+        currentId = w.apply(location, IncreaseByOne.INSTANCE, currentId);
+        return result;
+    }
+    
+    public void iterateList(long location, CodeWriter w, Variable variable, IVal listValue) {
+        Type componentType = variable.getType();
+        IVal listLength = w.apply(location, ListLength.INSTANCE.createSpecialization(componentType), listValue);
+        
+        CodeWriter body = w.createBlock(Types.INTEGER);
+        ICont bodyContinuation = body.getContinuation();
+        CodeWriter end = w.createBlock();
+                
+        w.jump(body.getContinuation(), IntegerConstant.ZERO);
+        
+        IVal index = body.getParameters()[0];
+        body.branchAwayIf(body.apply(location, JavaComparisonOperation.IEQUAL, index, listLength),
+                end.getContinuation());
+        variable.setVal(body.apply(location, ListElement.INSTANCE.createSpecialization(componentType), listValue, index));
+        nextOp(body);
+        if(body.isUnfinished())
+            body.jump(bodyContinuation, body.apply(location, IncreaseByOne.INSTANCE, index));
+        
+        w.continueAs(end);
+    }
+
+    public void check(long location, CodeWriter w, IVal booleanValue) {
+        CodeWriter end = w.createBlock();
+        w.branchAwayUnless(booleanValue, end.getContinuation());
+        nextOp(w);
+        if(w.isUnfinished())
+            w.jump(end.getContinuation());
+        w.continueAs(end);
+    }
+}