refactor file structure

browser/lib/linkState.js

@@ -0,0 +1,36 @@
+function getIn (object, path) {
+  let stack = path.split('.')
+  while (stack.length > 1) {
+    object = object[stack.shift()]
+  }
+  return object[stack.shift()]
+}
+
+function updateIn (object, path, value) {
+  let current = object
+  let stack = path.split('.')
+  while (stack.length > 1) {
+    current = current[stack.shift()]
+  }
+  current[stack.shift()] = value
+  return object
+}
+
+function setPartialState (component, path, value) {
+  component.setState(
+    updateIn(component.state, path, value))
+}
+
+export default function linkState (path) {
+  return {
+    value: getIn(this.state, path),
+    requestChange: setPartialState.bind(null, this, path)
+  }
+}
+
+export function linkState2 (el, path) {
+  return {
+    value: getIn(el.state, path),
+    requestChange: setPartialState.bind(null, el, path)
+  }
+}