PS: Add case insensitive naming to Attributes.

Author: MathiasVP

powershell/ql/lib/semmle/code/powershell/ast/internal/Attribute.qll

@@ -1,7 +1,10 @@
 private import AstImport
 
 class Attribute extends AttributeBase, TAttribute {
-  string getName() { result = getRawAst(this).(Raw::Attribute).getName() }
+  string getLowerCaseName() { result = getRawAst(this).(Raw::Attribute).getName().toLowerCase() }
+
+  bindingset[result]
+  string getAName() { result.toLowerCase() = this.getLowerCaseName() }
 
   NamedAttributeArgument getNamedArgument(int i) {
     exists(ChildIndex index, Raw::Ast r | index = attributeNamedArg(i) and r = getRawAst(this) |
@@ -41,7 +44,7 @@ class Attribute extends AttributeBase, TAttribute {
     result = this.toStringSpecific()
     or
     not exists(this.toStringSpecific()) and
-    result = this.getName()
+    result = this.getLowerCaseName()
   }
 
   final override Ast getChild(ChildIndex i) {

powershell/ql/lib/semmle/code/powershell/controlflow/CfgNodes.qll

@@ -180,6 +180,11 @@ class AttributeCfgNode extends AttributeBaseCfgNode {
   ExprCfgNode getPositionalArgument(int i) {
     attr.hasCfgChild(attr.getPositionalArgument(i), this, result)
   }
+
+  string getLowerCaseName() { result = attr.getLowerCaseName() }
+
+  bindingset[result]
+  string getAName() { result = attr.getAName() }
 }
 
 private class ScriptBlockChildMapping extends NonExprChildMapping, ScriptBlock {