python: remove getTree for now

Author: yoff

python/ql/lib/semmle/python/Concepts.qll

@@ -519,9 +519,6 @@ class XPathExecution extends DataFlow::Node {
   /** Gets the data flow node for the XPath expression being executed by this node. */
   DataFlow::Node getXPath() { result = range.getXPath() }
 
-  /** Gets a dataflow node for the tree in which the XPath expression is being evaluated. */
-  DataFlow::Node getTree() { result = range.getTree() }
-
   /**
    * Gets the name of this XPath expression execution, typically the name of an executing method.
    * This is used for nice alert messages and should include the module if possible.
@@ -544,9 +541,6 @@ module XPathExecution {
     /** Gets the data flow node for the XPath expression being executed by this node. */
     abstract DataFlow::Node getXPath();
 
-    /** Gets a dataflow node for the tree in which the XPath expression is being evaluated. */
-    abstract DataFlow::Node getTree();
-
     /**
      * Gets the name of this xpath expression execution, typically the name of an executing method.
      * This is used for nice alert messages and should include the module if possible.

python/ql/lib/semmle/python/frameworks/Libxml2.qll

@@ -40,9 +40,6 @@ private module Libxml2 {
 
     override DataFlow::Node getXPath() { result = this.getArg(0) }
 
-    // TODO: implement when we get call nodes
-    override DataFlow::Node getTree() { none() }
-
     override string getName() { result = "libxml2" }
   }
 }

python/ql/lib/semmle/python/frameworks/Lxml.qll

@@ -68,9 +68,6 @@ private module Lxml {
 
     override DataFlow::Node getXPath() { result in [this.getArg(0), this.getArgByName("_path")] }
 
-    // TODO: implement when we get call nodes
-    override DataFlow::Node getTree() { none() }
-
     override string getName() { result = "lxml.etree" }
   }
 }