Add removed Null

Author: dolphinau

src/ps/cast.rs

@@ -211,8 +211,8 @@ impl<'a> RuleMut<'a> for CastNull {
         if view.kind() == "expression_with_unary_operator" {
             if let (Some(operator), Some(expression)) = (view.child(0), view.child(1)) {
                 match (operator.text()?.to_lowercase().as_str(), expression.data()) {
-                    ("+", Some(Powershell::DeadCode)) => node.set(Raw(Num(0))),
-                    ("-", Some(Powershell::DeadCode)) => node.set(Raw(Num(0))),
+                    ("+", Some(Powershell::Null)) => node.set(Raw(Num(0))),
+                    ("-", Some(Powershell::Null)) => node.set(Raw(Num(0))),
                     _ => (),
                 }
             }

src/ps/forward.rs

@@ -1,6 +1,6 @@
 use crate::error::{Error, MinusOneResult};
 use crate::ps::Powershell;
-use crate::ps::Powershell::DeadCode;
+use crate::ps::Powershell::Null;
 use crate::rule::RuleMut;
 use crate::tree::{ControlFlow, NodeMut};
 
@@ -92,7 +92,7 @@ impl<'a> RuleMut<'a> for Forward {
                     }
                 } else {
                     // an empty subexpression is considering as null output
-                    node.reduce(DeadCode)
+                    node.reduce(Null)
                 }
             }
             "parenthesized_expression" => {

src/ps/mod.rs

@@ -105,6 +105,7 @@ pub enum Powershell {
     Array(Vec<Value>),
     PSItem(Vec<Value>),
     DeadCode,
+    Null,
     HashMap(BTreeMap<Value, Value>),
     HashEntry(Value, Value),
     Type(String), // Will infer type

src/ps/var.rs

@@ -1,5 +1,5 @@
 use crate::error::{Error, MinusOneResult};
-use crate::ps::Powershell::{self, Array, DeadCode, Raw, Type};
+use crate::ps::Powershell::{self, Array, Null, Raw, Type};
 use crate::ps::Value::{self, Bool, Num, Str};
 use crate::regex::Regex;
 use crate::rule::{Rule, RuleMut};
@@ -656,7 +656,7 @@ impl<'a> RuleMut<'a> for StaticVar {
             match view.text()?.to_lowercase().as_str() {
                 "$shellid" => node.set(Raw(Str(String::from("Microsoft.Powershell")))),
                 "$?" => node.set(Raw(Bool(true))),
-                "$null" => node.set(DeadCode),
+                "$null" => node.set(Null),
                 "$pshome" => node.set(Raw(Str(String::from(
                     "C:\\Windows\\System32\\WindowsPowerShell\\v1.0",
                 )))),