Python: Fix uses of implicit this

Quoting the style guide:

"14. _Always_ qualify _calls_ to predicates of the same class with
`this`."

python/ql/lib/semmle/python/ApiGraphs.qll

@@ -55,7 +55,7 @@ module API {
     /**
      * Gets a call to the function represented by this API component.
      */
-    DataFlow::CallCfgNode getACall() { result = getReturn().getAnImmediateUse() }
+    DataFlow::CallCfgNode getACall() { result = this.getReturn().getAnImmediateUse() }
 
     /**
      * Gets a node representing member `m` of this API component.
@@ -67,21 +67,21 @@ module API {
      */
     bindingset[m]
     bindingset[result]
-    Node getMember(string m) { result = getASuccessor(Label::member(m)) }
+    Node getMember(string m) { result = this.getASuccessor(Label::member(m)) }
 
     /**
      * Gets a node representing a member of this API component where the name of the member is
      * not known statically.
      */
-    Node getUnknownMember() { result = getASuccessor(Label::unknownMember()) }
+    Node getUnknownMember() { result = this.getASuccessor(Label::unknownMember()) }
 
     /**
      * Gets a node representing a member of this API component where the name of the member may
      * or may not be known statically.
      */
     Node getAMember() {
-      result = getASuccessor(Label::member(_)) or
-      result = getUnknownMember()
+      result = this.getASuccessor(Label::member(_)) or
+      result = this.getUnknownMember()
     }
 
     /**
@@ -90,23 +90,25 @@ module API {
      * This predicate may have multiple results when there are multiple invocations of this API component.
      * Consider using `getACall()` if there is a need to distinguish between individual calls.
      */
-    Node getReturn() { result = getASuccessor(Label::return()) }
+    Node getReturn() { result = this.getASuccessor(Label::return()) }
 
     /**
      * Gets a node representing a subclass of the class represented by this node.
      */
-    Node getASubclass() { result = getASuccessor(Label::subclass()) }
+    Node getASubclass() { result = this.getASuccessor(Label::subclass()) }
 
     /**
      * Gets a node representing the result from awaiting this node.
      */
-    Node getAwaited() { result = getASuccessor(Label::await()) }
+    Node getAwaited() { result = this.getASuccessor(Label::await()) }
 
     /**
      * Gets a string representation of the lexicographically least among all shortest access paths
      * from the root to this node.
      */
-    string getPath() { result = min(string p | p = getAPath(Impl::distanceFromRoot(this)) | p) }
+    string getPath() {
+      result = min(string p | p = this.getAPath(Impl::distanceFromRoot(this)) | p)
+    }
 
     /**
      * Gets a node such that there is an edge in the API graph between this node and the other
@@ -124,13 +126,13 @@ module API {
      * Gets a node such that there is an edge in the API graph between this node and the other
      * one.
      */
-    Node getAPredecessor() { result = getAPredecessor(_) }
+    Node getAPredecessor() { result = this.getAPredecessor(_) }
 
     /**
      * Gets a node such that there is an edge in the API graph between that other node and
      * this one.
      */
-    Node getASuccessor() { result = getASuccessor(_) }
+    Node getASuccessor() { result = this.getASuccessor(_) }
 
     /**
      * Gets the data-flow node that gives rise to this node, if any.
@@ -147,11 +149,11 @@ module API {
     predicate hasLocationInfo(
       string filepath, int startline, int startcolumn, int endline, int endcolumn
     ) {
-      getInducingNode().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
+      this.getInducingNode().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn)
       or
       // For nodes that do not have a meaningful location, `path` is the empty string and all other
       // parameters are zero.
-      not exists(getInducingNode()) and
+      not exists(this.getInducingNode()) and
       filepath = "" and
       startline = 0 and
       startcolumn = 0 and
@@ -202,7 +204,7 @@ module API {
         or
         this = Impl::MkModuleImport(_) and type = "ModuleImport "
       |
-        result = type + getPath()
+        result = type + this.getPath()
         or
         not exists(this.getPath()) and result = type + "with no path"
       )

python/ql/lib/semmle/python/Exprs.qll

@@ -240,7 +240,7 @@ class Call extends Call_ {
   /** Gets the tuple (*) argument of this call, provided there is exactly one. */
   Expr getStarArg() {
     count(this.getStarargs()) < 2 and
-    result = getStarargs()
+    result = this.getStarargs()
   }
 }
 

python/ql/lib/semmle/python/Files.qll

@@ -256,7 +256,7 @@ abstract class Container extends @container {
    * </table>
    */
   string getBaseName() {
-    result = getAbsolutePath().regexpCapture(".*/(([^/]*?)(?:\\.([^.]*))?)", 1)
+    result = this.getAbsolutePath().regexpCapture(".*/(([^/]*?)(?:\\.([^.]*))?)", 1)
   }
 
   /**
@@ -282,7 +282,9 @@ abstract class Container extends @container {
    * <tr><td>"/tmp/x.tar.gz"</td><td>"gz"</td></tr>
    * </table>
    */
-  string getExtension() { result = getAbsolutePath().regexpCapture(".*/([^/]*?)(\\.([^.]*))?", 3) }
+  string getExtension() {
+    result = this.getAbsolutePath().regexpCapture(".*/([^/]*?)(\\.([^.]*))?", 3)
+  }
 
   /**
    * Gets the stem of this container, that is, the prefix of its base name up to
@@ -301,7 +303,9 @@ abstract class Container extends @container {
    * <tr><td>"/tmp/x.tar.gz"</td><td>"x.tar"</td></tr>
    * </table>
    */
-  string getStem() { result = getAbsolutePath().regexpCapture(".*/([^/]*?)(?:\\.([^.]*))?", 1) }
+  string getStem() {
+    result = this.getAbsolutePath().regexpCapture(".*/([^/]*?)(?:\\.([^.]*))?", 1)
+  }
 
   File getFile(string baseName) {
     result = this.getAFile() and

python/ql/lib/semmle/python/Flow.qll

@@ -851,9 +851,9 @@ class ForNode extends ControlFlowNode {
 
   /** Holds if this `for` statement causes iteration over `sequence` storing each step of the iteration in `target` */
   predicate iterates(ControlFlowNode target, ControlFlowNode sequence) {
-    sequence = getSequence() and
-    target = possibleTarget() and
-    not target = unrolledSuffix().possibleTarget()
+    sequence = this.getSequence() and
+    target = this.possibleTarget() and
+    not target = this.unrolledSuffix().possibleTarget()
   }
 
   /** Gets the sequence node for this `for` statement. */

python/ql/lib/semmle/python/Import.qll

@@ -31,7 +31,7 @@ class ImportExpr extends ImportExpr_ {
     // relative imports are no longer allowed in Python 3
     major_version() < 3 and
     // and can be explicitly turned off in later versions of Python 2
-    not getEnclosingModule().hasFromFuture("absolute_import")
+    not this.getEnclosingModule().hasFromFuture("absolute_import")
   }
 
   /**
@@ -53,8 +53,8 @@ class ImportExpr extends ImportExpr_ {
    * the name of the topmost module that will be imported.
    */
   private string relativeTopName() {
-    getLevel() = -1 and
-    result = basePackageName(1) + "." + this.getTopName() and
+    this.getLevel() = -1 and
+    result = this.basePackageName(1) + "." + this.getTopName() and
     valid_module_name(result)
   }
 
@@ -62,7 +62,7 @@ class ImportExpr extends ImportExpr_ {
     if this.getLevel() <= 0
     then result = this.getTopName()
     else (
-      result = basePackageName(this.getLevel()) and
+      result = this.basePackageName(this.getLevel()) and
       valid_module_name(result)
     )
   }
@@ -73,17 +73,17 @@ class ImportExpr extends ImportExpr_ {
    * which may not be the name of the module.
    */
   string bottomModuleName() {
-    result = relativeTopName() + this.remainderOfName()
+    result = this.relativeTopName() + this.remainderOfName()
     or
-    not exists(relativeTopName()) and
+    not exists(this.relativeTopName()) and
     result = this.qualifiedTopName() + this.remainderOfName()
   }
 
   /** Gets the name of topmost module or package being imported */
   string topModuleName() {
-    result = relativeTopName()
+    result = this.relativeTopName()
     or
-    not exists(relativeTopName()) and
+    not exists(this.relativeTopName()) and
     result = this.qualifiedTopName()
   }
 
@@ -94,7 +94,7 @@ class ImportExpr extends ImportExpr_ {
    */
   string getImportedModuleName() {
     exists(string bottomName | bottomName = this.bottomModuleName() |
-      if this.isTop() then result = topModuleName() else result = bottomName
+      if this.isTop() then result = this.topModuleName() else result = bottomName
     )
   }
 

python/ql/lib/semmle/python/Module.qll

@@ -86,13 +86,13 @@ class Module extends Module_, Scope, AstNode {
   /** Gets the package containing this module (or parent package if this is a package) */
   Module getPackage() {
     this.getName().matches("%.%") and
-    result.getName() = getName().regexpReplaceAll("\\.[^.]*$", "")
+    result.getName() = this.getName().regexpReplaceAll("\\.[^.]*$", "")
   }
 
   /** Gets the name of the package containing this module */
   string getPackageName() {
     this.getName().matches("%.%") and
-    result = getName().regexpReplaceAll("\\.[^.]*$", "")
+    result = this.getName().regexpReplaceAll("\\.[^.]*$", "")
   }
 
   /** Gets the metrics for this module */

python/ql/lib/semmle/python/RegexTreeView.qll

@@ -55,10 +55,10 @@ class RegExpParent extends TRegExpParent {
   abstract RegExpTerm getChild(int i);
 
   /** Gets a child term . */
-  RegExpTerm getAChild() { result = getChild(_) }
+  RegExpTerm getAChild() { result = this.getChild(_) }
 
   /** Gets the number of child terms. */
-  int getNumChild() { result = count(getAChild()) }
+  int getNumChild() { result = count(this.getAChild()) }
 
   /** Gets the associated regex. */
   abstract Regex getRegex();
@@ -117,7 +117,7 @@ class RegExpTerm extends RegExpParent {
   RegExpTerm getRootTerm() {
     this.isRootTerm() and result = this
     or
-    result = getParent().(RegExpTerm).getRootTerm()
+    result = this.getParent().(RegExpTerm).getRootTerm()
   }
 
   /**
@@ -196,7 +196,7 @@ class RegExpTerm extends RegExpParent {
 
   /** Gets the regular expression term that is matched (textually) before this one, if any. */
   RegExpTerm getPredecessor() {
-    exists(RegExpTerm parent | parent = getParent() |
+    exists(RegExpTerm parent | parent = this.getParent() |
       result = parent.(RegExpSequence).previousElement(this)
       or
       not exists(parent.(RegExpSequence).previousElement(this)) and
@@ -207,7 +207,7 @@ class RegExpTerm extends RegExpParent {
 
   /** Gets the regular expression term that is matched (textually) after this one, if any. */
   RegExpTerm getSuccessor() {
-    exists(RegExpTerm parent | parent = getParent() |
+    exists(RegExpTerm parent | parent = this.getParent() |
       result = parent.(RegExpSequence).nextElement(this)
       or
       not exists(parent.(RegExpSequence).nextElement(this)) and
@@ -358,7 +358,7 @@ class RegExpSequence extends RegExpTerm, TRegExpSequence {
   override RegExpTerm getChild(int i) { result = seqChild(re, start, end, i) }
 
   /** Gets the element preceding `element` in this sequence. */
-  RegExpTerm previousElement(RegExpTerm element) { element = nextElement(result) }
+  RegExpTerm previousElement(RegExpTerm element) { element = this.nextElement(result) }
 
   /** Gets the element following `element` in this sequence. */
   RegExpTerm nextElement(RegExpTerm element) {
@@ -461,8 +461,8 @@ class RegExpEscape extends RegExpNormalChar {
     // TODO: Find a way to include a formfeed character
     // this.getUnescaped() = "f" and result = ""
     // or
-    isUnicode() and
-    result = getUnicode()
+    this.isUnicode() and
+    result = this.getUnicode()
   }
 
   predicate isIdentityEscape() { not this.getUnescaped() in ["n", "r", "t", "f"] }
@@ -479,7 +479,7 @@ class RegExpEscape extends RegExpNormalChar {
   /**
    * Holds if this is a unicode escape.
    */
-  private predicate isUnicode() { getText().prefix(2) = ["\\u", "\\U"] }
+  private predicate isUnicode() { this.getText().prefix(2) = ["\\u", "\\U"] }
 
   /**
    * Gets the unicode char for this escape.
@@ -569,13 +569,13 @@ class RegExpCharacterClass extends RegExpTerm, TRegExpCharacterClass {
 
   predicate isUniversalClass() {
     // [^]
-    isInverted() and not exists(getAChild())
+    this.isInverted() and not exists(this.getAChild())
     or
     // [\w\W] and similar
-    not isInverted() and
+    not this.isInverted() and
     exists(string cce1, string cce2 |
-      cce1 = getAChild().(RegExpCharacterClassEscape).getValue() and
-      cce2 = getAChild().(RegExpCharacterClassEscape).getValue()
+      cce1 = this.getAChild().(RegExpCharacterClassEscape).getValue() and
+      cce2 = this.getAChild().(RegExpCharacterClassEscape).getValue()
     |
       cce1 != cce2 and cce1.toLowerCase() = cce2.toLowerCase()
     )

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

@@ -610,11 +610,11 @@ class DataFlowLambda extends DataFlowCallable, TLambda {
 
   override string toString() { result = lambda.toString() }
 
-  override CallNode getACall() { result = getCallableValue().getACall() }
+  override CallNode getACall() { result = this.getCallableValue().getACall() }
 
   override Scope getScope() { result = lambda.getEvaluatingScope() }
 
-  override NameNode getParameter(int n) { result = getParameter(getCallableValue(), n) }
+  override NameNode getParameter(int n) { result = getParameter(this.getCallableValue(), n) }
 
   override string getName() { result = "Lambda callable" }
 

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

@@ -62,12 +62,12 @@ class LocalSourceNode extends Node {
   /**
    * Gets a read of attribute `attrName` on this node.
    */
-  AttrRead getAnAttributeRead(string attrName) { result = getAnAttributeReference(attrName) }
+  AttrRead getAnAttributeRead(string attrName) { result = this.getAnAttributeReference(attrName) }
 
   /**
    * Gets a write of attribute `attrName` on this node.
    */
-  AttrWrite getAnAttributeWrite(string attrName) { result = getAnAttributeReference(attrName) }
+  AttrWrite getAnAttributeWrite(string attrName) { result = this.getAnAttributeReference(attrName) }
 
   /**
    * Gets a reference (read or write) of any attribute on this node.
@@ -81,12 +81,12 @@ class LocalSourceNode extends Node {
   /**
    * Gets a read of any attribute on this node.
    */
-  AttrRead getAnAttributeRead() { result = getAnAttributeReference() }
+  AttrRead getAnAttributeRead() { result = this.getAnAttributeReference() }
 
   /**
    * Gets a write of any attribute on this node.
    */
-  AttrWrite getAnAttributeWrite() { result = getAnAttributeReference() }
+  AttrWrite getAnAttributeWrite() { result = this.getAnAttributeReference() }
 
   /**
    * Gets a call to this node.