From d87718047613a56f8c4df0a7519f12351b84e749 Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Sat, 30 Jan 2021 20:10:40 -0600
Subject: [PATCH] feat: assignment

---
 .../src/behavior-components/expression.jsx    | 59 ++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/packages/entity/src/behavior-components/expression.jsx b/packages/entity/src/behavior-components/expression.jsx
index 80ddcd1..6d3f7ba 100644
--- a/packages/entity/src/behavior-components/expression.jsx
+++ b/packages/entity/src/behavior-components/expression.jsx
@@ -11,6 +11,7 @@ import classnames from 'classnames';
 
 import Invocation from './expression/invocation';
 import Key from './expression/key';
+import Variant from './variant';
 
 const Expression = ({
   context,
@@ -21,7 +22,7 @@ const Expression = ({
   const latus = useLatus();
   const patch = useJsonPatcher();
   let i = 0;
-  const {ops} = value;
+  const {ops, value: expressionValue} = value;
   const Renderables = [];
   let opsCount = 0;
   // eslint-disable-next-line react/destructuring-assignment
@@ -205,6 +206,57 @@ const Expression = ({
     opsCount += 1;
   }
   const [lastOp] = ops.slice(-1);
+  if (
+    'void' === type
+    && !description.args
+    && isKey(lastOp)
+  ) {
+    const opPath = join(path, 'value');
+    Renderables.push(
+      <Key
+        childrenDescription={{
+          '.': {label: '', type: description.type},
+          '≔': {label: '', type: 'void'},
+        }}
+        key={opPath}
+        onChange={(event, value) => {
+          if ('.' === value) {
+            patch({
+              op: 'remove',
+              path: opPath,
+            });
+          }
+          else {
+            patch({
+              path: opPath,
+              value: {
+                type: 'literal',
+              },
+            });
+          }
+        }}
+        path={opPath}
+        value={expressionValue ? '≔' : '.'}
+      />,
+    );
+    if (expressionValue) {
+      Renderables.push(
+        <Variant
+          context={context}
+          onChange={(event, value, localPath) => {
+            patch({
+              path: localPath,
+              value,
+            });
+          }}
+          key={join(opPath, 'expression')}
+          path={opPath}
+          type={description.type}
+          value={expressionValue}
+        />,
+      );
+    }
+  }
   let realType;
   if (isKey(lastOp)) {
     realType = description.args
@@ -214,6 +266,9 @@ const Expression = ({
   if (isInvocation(lastOp)) {
     realType = description.type;
   }
+  if (expressionValue) {
+    realType = 'void';
+  }
   return (
     <div
       className={classnames(
@@ -244,6 +299,8 @@ Expression.propTypes = {
         key: PropTypes.string,
       }),
     ),
+    // eslint-disable-next-line react/forbid-prop-types
+    value: PropTypes.any,
   }).isRequired,
   path: PropTypes.string.isRequired,
   type: PropTypes.string.isRequired,