Add table expression constructor

src/ast.rs

@@ -88,6 +88,17 @@ impl Expression {
 	pub fn new_variable(name: impl Into<String>) -> Self {
 		Self::Variable(Location::new_variable(name))
 	}
+
+	pub fn new_table<'a>(fields: impl Iterator<Item = (&'a str, Expression)>) -> Self {
+		Self::Table(Table {
+			fields: fields
+				.map(|(key, value)| Field {
+					name: Expression::new_constant(key),
+					init: value,
+				})
+				.collect(),
+		})
+	}
 }
 
 impl From<()> for Constant {