feat(weex): support compiling `v-on` in the weex native directive (#6892)

* refactor(compiler): move postTransforms to after children are processed

* feat(weex): recycle-list support WIP

* refactor: fix types

* feat(weex): split text into separate module

* feat($compiler): supports compiling v-bind to the weex native directive in recycle-list

* feat(compile): supports compiling v-if to the weex native directive

* feat($compiler): supports compiling v-for to the weex native directive

* feat($compiler): compile weex native directives in preTransformNode

* feat($compiler): supports compiling v-else-if and v-else to the weex native directive

* feat($event): support binding parameters on event handler within weex recycle-list

* refactor: mark weex-specific block

* feat(wip): recycle list template inline expand

* build: add weex factory dev script

* feat($compiler): support to compile "v-on" into weex native directive

* feat($compiler): adjust handler params to fit the weex native renderer

+ Filter the non-expression params and the `$event`.
+ Use `$event` as the last argument of handler.

flow/compiler.js

@@ -56,6 +56,7 @@ declare type ASTIfConditions = Array<ASTIfCondition>;
 
 declare type ASTElementHandler = {
   value: string;
+  params?: Array<any>;
   modifiers: ?ASTModifiers;
 };
 

src/compiler/codegen/events.js

@@ -46,6 +46,17 @@ export function genHandlers (
   return res.slice(0, -1) + '}'
 }
 
+// Generate handler code with binding params on Weex
+function genWeexHandler (params: Array<any>, handlerCode: string) {
+  const wrapperArgs = params.filter(exp => simplePathRE.test(exp) && exp !== '$event')
+  const handlerParams = wrapperArgs.map(exp => ({ '@binding': exp }))
+  wrapperArgs.push('$event')
+  return '{' +
+    `handler:function(${wrapperArgs.join(',')}){${handlerCode}},\n` +
+    `params:${JSON.stringify(handlerParams)}` +
+    '}'
+}
+
 function genHandler (
   name: string,
   handler: ASTElementHandler | Array<ASTElementHandler>
@@ -62,9 +73,14 @@ function genHandler (
   const isFunctionExpression = fnExpRE.test(handler.value)
 
   if (!handler.modifiers) {
-    return isMethodPath || isFunctionExpression
+    if (isMethodPath || isFunctionExpression) {
-      ? handler.value
+      return handler.value
-      : `function($event){${handler.value}}` // inline statement
+    }
+    // $flow-disable-line
+    if (__WEEX__ && handler.params) {
+      return genWeexHandler(handler.params, handler.value)
+    }
+    return `function($event){${handler.value}}` // inline statement
   } else {
     let code = ''
     let genModifierCode = ''
@@ -100,6 +116,10 @@ function genHandler (
       : isFunctionExpression
         ? `(${handler.value})($event)`
         : handler.value
+    // $flow-disable-line
+    if (__WEEX__ && handler.params) {
+      return genWeexHandler(handler.params, code + handlerCode)
+    }
     return `function($event){${code}${handlerCode}}`
   }
 }

src/core/vdom/create-component.js

@@ -145,11 +145,11 @@ export function createComponent (
   data = data || {}
 
   // recycle-list optimized render function for extracting cell-slot
-  // template. This is essentailly inline expanding instead of creating
+  // template. This is essentially inline expanding instead of creating
   // an actual instance.
   // https://github.com/Hanks10100/weex-native-directive/tree/master/component
   // $flow-disable-line
-  if (__WEEX__ && data.attrs['@isInRecycleList']) {
+  if (__WEEX__ && data.attrs && data.attrs['@isInRecycleList']) {
     const altRender = Ctor.options['@render']
     if (altRender) {
       return altRender.call(

src/platforms/weex/compiler/modules/recycle-list/index.js

@@ -4,6 +4,7 @@ import { transformText } from './text'
 import { transformVBind } from './v-bind'
 import { transformVIf } from './v-if'
 import { transformVFor } from './v-for'
+import { postTransformVOn } from './v-on'
 
 let currentRecycleList = null
 
@@ -31,6 +32,7 @@ function postTransformNode (el: ASTElement) {
     if (el.tag === 'text') {
       transformText(el)
     }
+    postTransformVOn(el)
   }
   if (el === currentRecycleList) {
     currentRecycleList = null

src/platforms/weex/compiler/modules/recycle-list/v-on.js

@@ -0,0 +1,25 @@
+/* @flow */
+
+const inlineStatementRE = /^\s*([A-Za-z_$0-9\.]+)*\s*\(\s*(([A-Za-z_$0-9\'\"]+)?(\s*,\s*([A-Za-z_$0-9\'\"]+))*)\s*\)$/
+
+function parseHandlerParams (handler: ASTElementHandler) {
+  const res = inlineStatementRE.exec(handler.value)
+  if (res && res[2]) {
+    handler.params = res[2].split(/\s*,\s*/)
+  }
+}
+
+export function postTransformVOn (el: ASTElement) {
+  const events: ASTElementHandlers | void = el.events
+  if (!events) {
+    return
+  }
+  for (const name in events) {
+    const handler: ASTElementHandler | Array<ASTElementHandler> = events[name]
+    if (Array.isArray(handler)) {
+      handler.map(fn => parseHandlerParams(fn))
+    } else {
+      parseHandlerParams(handler)
+    }
+  }
+}