fix(#9577): support deep object as dynamic arguments

src/compiler/parser/index.js

@@ -33,7 +33,7 @@ const dynamicArgRE = /^\[.*\]$/
 const argRE = /:(.*)$/
 export const bindRE = /^:|^\.|^v-bind:/
 const propBindRE = /^\./
-const modifierRE = /\.[^.]+/g
+const modifierRE = /(\.[^.\]]+)+$/g
 
 const slotRE = /^v-slot(:|$)|^#/
 
@@ -906,7 +906,7 @@ function parseModifiers (name: string): Object | void {
   const match = name.match(modifierRE)
   if (match) {
     const ret = {}
-    match.forEach(m => { ret[m.slice(1)] = true })
+    match[0].slice(1).split('.').forEach(item => ret[item] = true)
     return ret
   }
 }

test/unit/features/options/directives.spec.js

@@ -287,4 +287,54 @@ describe('Options directives', () => {
     }).$mount()
     vm.key = 'bar'
   })
+
+  it('deep object like `deep.a` as dynamic arguments', done => {
+    const vm = new Vue({
+      template: `<div v-my:[deep.a]="1"/>`,
+      data: {
+        deep: {
+          a: 'foo'
+        }
+      },
+      directives: {
+        my: {
+          bind(el, binding) {
+            expect(binding.arg).toBe('foo')
+          },
+          update(el, binding) {
+            expect(binding.arg).toBe('bar')
+            expect(binding.oldArg).toBe('foo')
+            done()
+          }
+        }
+      }
+    }).$mount()
+    vm.deep.a = 'bar'
+  })
+
+  it('deep object like `deep.a.b` as dynamic arguments', done => {
+    const vm = new Vue({
+      template: `<div v-my:[deep.a.b]="1"/>`,
+      data: {
+        deep: {
+          a: {
+            b: 'foo'
+          }
+        }
+      },
+      directives: {
+        my: {
+          bind(el, binding) {
+            expect(binding.arg).toBe('foo')
+          },
+          update(el, binding) {
+            expect(binding.arg).toBe('bar')
+            expect(binding.oldArg).toBe('foo')
+            done()
+          }
+        }
+      }
+    }).$mount()
+    vm.deep.a.b = 'bar'
+  })
 })