event modifiers

src/compiler/codegen/events.js

@@ -1,35 +1,61 @@
 import { isArray } from '../../util/index'
 
 const simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?'\]|\[".*?"\]|\[\d+\]|\[[A-Za-z_$][\w$]*\])*$/
+const modifierCode = {
+  stop: '$event.stopPropagation();',
+  prevent: '$event.preventDefault();',
+  self: 'if($event.target !== $event.currentTarget)return;'
+}
 
-export function addHandler (events, name, value) {
+export function addHandler (events, name, value, modifiers) {
+  // check capture modifier
+  const captureIndex = modifiers && modifiers.indexOf('capture')
+  if (captureIndex > -1) {
+    modifiers.splice(captureIndex, 1)
+    name = '!' + name // mark the event as captured
+  }
+  const newHandler = { value, modifiers }
   const handlers = events[name]
   if (isArray(handlers)) {
-    handlers.push(value)
+    handlers.push(newHandler)
   } else if (handlers) {
-    events[name] = [handlers, value]
+    events[name] = [handlers, newHandler]
   } else {
-    events[name] = value
+    events[name] = newHandler
   }
 }
 
 export function genEvents (events) {
   let res = 'on:{'
-  for (var name in events) {
+  for (let name in events) {
     res += `"${name}":${genHandler(events[name])},`
   }
+  console.log(res)
   return res.slice(0, -1) + '}'
 }
 
-function genHandler (value) {
-  // TODO support modifiers
-  if (!value) {
+function genHandler (handler) {
+  if (!handler) {
     return `function(){}`
-  } else if (isArray(value)) {
-    return `[${value.map(genHandler).join(',')}]`
-  } else if (simplePathRE.test(value)) {
-    return value
+  } else if (isArray(handler)) {
+    return `[${handler.map(genHandler).join(',')}]`
+  } else if (!handler.modifiers || !handler.modifiers.length) {
+    return simplePathRE.test(handler.value)
+      ? handler.value
+      : `function($event){${handler.value}}`
   } else {
-    return `function($event){${value}}`
+    let code = 'function($event){'
+    for (let i = 0; i < handler.modifiers.length; i++) {
+      let modifier = handler.modifiers[i]
+      code += modifierCode[modifier] || genKeyFilter(modifier)
+    }
+    let handlerCode = simplePathRE.test(handler.value)
+      ? handler.value + '()'
+      : handler.value
+    return code + handlerCode + '}'
   }
 }
+
+function genKeyFilter (key) {
+
+}

src/compiler/codegen/helpers.js

@@ -15,16 +15,11 @@ export function getAndRemoveAttr (el, attr) {
 const modifierRE = /\.[^\.]+/g
 
 export function parseModifiers (name) {
-  var res = Object.create(null)
-  var match = name.match(modifierRE)
+  const match = name.match(modifierRE)
   if (match) {
-    var i = match.length
-    while (i--) {
-      res[match[i].slice(1)] = true
+    return match.map(m => m.slice(1))
   }
 }
-  return res
-}
 
 export function removeModifiers (name) {
   return name.replace(modifierRE, '')

src/compiler/codegen/index.js

@@ -8,9 +8,9 @@ import {
   getAndRemoveAttr
 } from './helpers'
 
+const dirRE = /^v-|^@|^:/
 const bindRE = /^:|^v-bind:/
 const onRE = /^@|^v-on:/
-const dirRE = /^v-/
 const mustUsePropsRE = /^(value|selected|checked|muted)$/
 
 export function generate (ast) {
@@ -90,6 +90,11 @@ function genData (el, key) {
     let attr = el.attrs[i]
     let name = attr.name
     let value = attr.value
+
+    if (dirRE.test(name)) {
+      // modifiers
+      const modifiers = parseModifiers(name)
+      name = removeModifiers(name)
       if (bindRE.test(name)) {
         name = name.replace(bindRE, '')
         if (name === 'style') {
@@ -104,12 +109,13 @@ function genData (el, key) {
       } else if (onRE.test(name)) {
         hasEvents = true
         name = name.replace(onRE, '')
-      addHandler(events, name, value)
+        addHandler(events, name, value, modifiers)
       } else if (name === 'v-model') {
         hasProps = hasEvents = true
         props += genModel(el, events, value) + ','
-    } else if (dirRE.test(name)) {
+      } else {
         // TODO: normal directives
+      }
     } else {
       hasAttrs = true
       attrs += `"${name}": (${JSON.stringify(attr.value)}),`

src/vdom/modules/events.js

@@ -12,7 +12,7 @@ function fnInvoker(o) {
 }
 
 function updateEventListeners(oldVnode, vnode) {
-  let name, cur, old
+  let name, cur, old, event, capture
   const elm = vnode.elm
   const oldOn = oldVnode.data.on || {}
   const on = vnode.data.on
@@ -21,12 +21,14 @@ function updateEventListeners(oldVnode, vnode) {
     cur = on[name]
     old = oldOn[name]
     if (old === undefined) {
+      capture = name.charAt(0) === '!'
+      event = capture ? name.slice(1) : name
       if (Array.isArray(cur)) {
-        elm.addEventListener(name, arrInvoker(cur))
+        elm.addEventListener(event, arrInvoker(cur), capture)
       } else {
         cur = {fn: cur}
         on[name] = cur
-        elm.addEventListener(name, fnInvoker(cur))
+        elm.addEventListener(event, fnInvoker(cur), capture)
       }
     } else if (Array.isArray(old)) {
       // Deliberately modify old array since it's captured in closure created with `arrInvoker`