Moved Assignable creation functions

ablescript/src/ast.rs

@@ -50,6 +50,39 @@ pub enum AssignableKind {
     Index { indices: Vec<Expr> },
 }
 
+impl Assignable {
+    pub fn from_expr(expr: Expr) -> Result<Assignable, ()> {
+        match expr.kind {
+            ExprKind::Variable(ident) => Ok(Assignable {
+                ident: Ident::new(ident, expr.span),
+                kind: AssignableKind::Variable,
+            }),
+            ExprKind::Index { expr, index } => Self::from_index(*expr, *index),
+            _ => Err(()),
+        }
+    }
+
+    fn from_index(mut buf: Expr, index: Expr) -> Result<Assignable, ()> {
+        let mut indices = vec![index];
+        let ident = loop {
+            match buf.kind {
+                ExprKind::Variable(ident) => break ident,
+                ExprKind::Index { expr, index } => {
+                    indices.push(*index);
+                    buf = *expr;
+                }
+                _ => return Err(()),
+            }
+        };
+
+        indices.reverse();
+        Ok(Assignable {
+            ident: Ident::new(ident, buf.span),
+            kind: AssignableKind::Index { indices },
+        })
+    }
+}
+
 #[derive(Debug, PartialEq, Clone, Hash)]
 pub struct Block {
     pub block: Vec<Stmt>,

ablescript/src/parser.rs

@@ -355,16 +355,7 @@ impl<'source> Parser<'source> {
 
                 // Variable Assignment
                 Token::Equal => {
-                    let assignable = buf.take().and_then(|buf| match buf.kind {
+                    if let Some(Ok(assignable)) = buf.take().map(Assignable::from_expr) {
-                        ExprKind::Variable(ident) => Some(Assignable {
-                            ident: Ident::new(ident, buf.span),
-                            kind: AssignableKind::Variable,
-                        }),
-                        ExprKind::Index { expr, index } => self.cart_assignable_flow(*expr, *index),
-                        _ => None,
-                    });
-
-                    if let Some(assignable) = assignable {
                         break StmtKind::Assign {
                             assignable,
                             value: self.expr_flow(Token::Semicolon)?,
@@ -395,27 +386,6 @@ impl<'source> Parser<'source> {
         Ok(r)
     }
 
-    /// Parse Cart Assignable flow
-    fn cart_assignable_flow(&mut self, mut buf: Expr, index: Expr) -> Option<Assignable> {
-        let mut indices = vec![index];
-        let ident = loop {
-            match buf.kind {
-                ExprKind::Variable(ident) => break ident,
-                ExprKind::Index { expr, index } => {
-                    indices.push(*index);
-                    buf = *expr;
-                }
-                _ => return None,
-            }
-        };
-
-        indices.reverse();
-        Some(Assignable {
-            ident: Ident::new(ident, buf.span),
-            kind: AssignableKind::Index { indices },
-        })
-    }
-
     /// Parse If flow
     ///
     /// Consists of condition and block, there is no else