Python: move capture node to DataFlowPrivate

Author: yoff

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll

@@ -688,6 +688,36 @@ predicate storeStep(Node nodeFrom, ContentSet c, Node nodeTo) {
   VariableCapture::storeStep(nodeFrom, c, nodeTo)
 }
 
+/**
+ * A synthesized data flow node representing a closure object that tracks
+ * captured variables.
+ */
+class SynthCaptureNode extends Node, TSynthCaptureNode {
+  private VariableCapture::Flow::SynthesizedCaptureNode cn;
+
+  SynthCaptureNode() { this = TSynthCaptureNode(cn) }
+
+  /** Gets the `SynthesizedCaptureNode` that this node represents. */
+  VariableCapture::Flow::SynthesizedCaptureNode getSynthesizedCaptureNode() { result = cn }
+
+  override Scope getScope() { result = cn.getEnclosingCallable() }
+
+  override Location getLocation() { result = cn.getLocation() }
+
+  override string toString() { result = cn.toString() }
+}
+
+private class SynthCapturePostUpdateNode extends PostUpdateNodeImpl, SynthCaptureNode {
+  private SynthCaptureNode pre;
+
+  SynthCapturePostUpdateNode() {
+    VariableCapture::Flow::capturePostUpdateNode(this.getSynthesizedCaptureNode(),
+      pre.getSynthesizedCaptureNode())
+  }
+
+  override Node getPreUpdateNode() { result = pre }
+}
+
 /**
  * INTERNAL: Do not use.
  *

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPublic.qll

@@ -504,36 +504,6 @@ class StarPatternElementNode extends Node, TStarPatternElementNode {
   override Location getLocation() { result = consumer.getLocation() }
 }
 
-/**
- * A synthesized data flow node representing a closure object that tracks
- * captured variables.
- */
-class SynthCaptureNode extends Node, TSynthCaptureNode {
-  private VariableCapture::Flow::SynthesizedCaptureNode cn;
-
-  SynthCaptureNode() { this = TSynthCaptureNode(cn) }
-
-  /** Gets the `SynthesizedCaptureNode` that this node represents. */
-  VariableCapture::Flow::SynthesizedCaptureNode getSynthesizedCaptureNode() { result = cn }
-
-  override Scope getScope() { result = cn.getEnclosingCallable() }
-
-  override Location getLocation() { result = cn.getLocation() }
-
-  override string toString() { result = cn.toString() }
-}
-
-private class SynthCapturePostUpdateNode extends PostUpdateNodeImpl, SynthCaptureNode {
-  private SynthCaptureNode pre;
-
-  SynthCapturePostUpdateNode() {
-    VariableCapture::Flow::capturePostUpdateNode(this.getSynthesizedCaptureNode(),
-      pre.getSynthesizedCaptureNode())
-  }
-
-  override Node getPreUpdateNode() { result = pre }
-}
-
 /**
  * Gets a node that controls whether other nodes are evaluated.
  *