Split up and expand ast

src/ast/field.rs

@@ -0,0 +1,70 @@
+use crate::span::{HasSpan, Span};
+
+use super::basic::{Ident, Space};
+use super::expr::Expr;
+
+#[derive(Debug, Clone)]
+pub enum Field {
+    /// `a[b]`
+    ///
+    /// Structure: `expr s0 [ s1 index s2 ]`
+    Access {
+        expr: Box<Expr>,
+        s0: Space,
+        s1: Space,
+        index: Box<Expr>,
+        s2: Space,
+        span: Span,
+    },
+
+    /// `a[b] = c`
+    ///
+    /// Structure: `expr s0 [ s1 index s2 ] s3 = s4 value`
+    Assign {
+        expr: Box<Expr>,
+        s0: Space,
+        s1: Space,
+        index: Box<Expr>,
+        s2: Space,
+        s3: Space,
+        s4: Space,
+        value: Box<Expr>,
+        span: Span,
+    },
+
+    /// `a.foo`
+    ///
+    /// Structure: `expr s0 . s1 ident`
+    AccessIdent {
+        expr: Box<Expr>,
+        s0: Space,
+        s1: Space,
+        ident: Ident,
+        span: Span,
+    },
+
+    /// `a.foo = b`
+    ///
+    /// Structure: `expr s0 . s1 ident s2 = s3 value`
+    AssignIdent {
+        expr: Box<Expr>,
+        s0: Space,
+        s1: Space,
+        ident: Ident,
+        s2: Space,
+        s3: Space,
+        value: Box<Expr>,
+        span: Span,
+    },
+}
+
+impl HasSpan for Field {
+    fn span(&self) -> Span {
+        match self {
+            Field::Access { span, .. } => *span,
+            Field::Assign { span, .. } => *span,
+            Field::AccessIdent { span, .. } => *span,
+            Field::AssignIdent { span, .. } => *span,
+        }
+    }
+}