Minor refactors.

src/ast/ast.rs

@@ -150,9 +150,10 @@ impl AST {
     #[inline(always)]
     #[must_use]
     pub fn source(&self) -> Option<&str> {
-        match self.source.as_str() {
-            "" => None,
-            s => Some(s),
+        if self.source.is_empty() {
+            None
+        } else {
+            Some(self.source.as_str())
         }
     }
     /// Get a reference to the source.

src/ast/stmt.rs

@@ -89,6 +89,26 @@ pub struct ConditionalStmtBlock {
     pub statements: StmtBlock,
 }
 
+impl<B: Into<StmtBlock>> From<B> for ConditionalStmtBlock {
+    #[inline(always)]
+    fn from(value: B) -> Self {
+        Self {
+            condition: None,
+            statements: value.into(),
+        }
+    }
+}
+
+impl<B: Into<StmtBlock>> From<(Expr, B)> for ConditionalStmtBlock {
+    #[inline(always)]
+    fn from(value: (Expr, B)) -> Self {
+        Self {
+            condition: Some(value.0),
+            statements: value.1.into(),
+        }
+    }
+}
+
 impl<B: Into<StmtBlock>> From<(Option<Expr>, B)> for ConditionalStmtBlock {
     #[inline(always)]
     fn from(value: (Option<Expr>, B)) -> Self {