Add hasName predicates

Author: hvitved

ql/lib/codeql/ruby/ast/Constant.qll

@@ -9,6 +9,9 @@ class ConstantAccess extends Expr, TConstantAccess {
   /** Gets the name of the constant being accessed. */
   string getName() { none() }
 
+  /** Holds if the name of the constant being accessed is `name`. */
+  final predicate hasName(string name) { this.getName() = name }
+
   /**
    * Gets the expression used in the access's scope resolution operation, if
    * any. In the following example, the result is the `Call` expression for

ql/lib/codeql/ruby/ast/Method.qll

@@ -26,6 +26,9 @@ class MethodBase extends Callable, BodyStmt, Scope, TMethodBase {
   /** Gets the name of this method. */
   string getName() { none() }
 
+  /** Holds if the name of this method is `name`. */
+  final predicate hasName(string name) { this.getName() = name }
+
   override AstNode getAChild(string pred) {
     result = Callable.super.getAChild(pred)
     or

ql/lib/codeql/ruby/ast/Parameter.qll

@@ -45,6 +45,9 @@ class NamedParameter extends Parameter, TNamedParameter {
   /** Gets the name of this parameter. */
   string getName() { none() }
 
+  /** Holds if the name of this parameter is `name`. */
+  final predicate hasName(string name) { this.getName() = name }
+
   /** Gets the variable introduced by this parameter. */
   LocalVariable getVariable() { none() }
 

ql/lib/codeql/ruby/ast/Variable.qll

@@ -11,6 +11,9 @@ class Variable extends TVariable {
   /** Gets the name of this variable. */
   string getName() { none() }
 
+  /** Holds if the name of this variable is `name`. */
+  final predicate hasName(string name) { this.getName() = name }
+
   /** Gets a textual representation of this variable. */
   final string toString() { result = this.getName() }