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/* @flow */
/**
* Expand input[v-model] with dynamic type bindings into v-if-else chains
* Turn this:
* <input v-model="data[type]" :type="type">
* into this:
* <input v-if="type === 'checkbox'" type="checkbox" v-model="data[type]">
* <input v-else-if="type === 'radio'" type="radio" v-model="data[type]">
* <input v-else :type="type" v-model="data[type]">
*/
import {
addRawAttr,
getBindingAttr,
getAndRemoveAttr
} from 'compiler/helpers'
import {
processFor,
processElement,
addIfCondition,
createASTElement
} from 'compiler/parser/index'
function preTransformNode (el: ASTElement, options: CompilerOptions) {
if (el.tag === 'input') {
const map = el.attrsMap
if (!map['v-model']) {
return
}
let typeBinding
if (map[':type'] || map['v-bind:type']) {
typeBinding = getBindingAttr(el, 'type')
}
if (!map.type && !typeBinding && map['v-bind']) {
typeBinding = `(${map['v-bind']}).type`
}
if (typeBinding) {
const ifCondition = getAndRemoveAttr(el, 'v-if', true)
const ifConditionExtra = ifCondition ? `&&(${ifCondition})` : ``
const hasElse = getAndRemoveAttr(el, 'v-else', true) != null
const elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true)
// 1. checkbox
const branch0 = cloneASTElement(el)
// process for on the main node
processFor(branch0)
addRawAttr(branch0, 'type', 'checkbox')
processElement(branch0, options)
branch0.processed = true // prevent it from double-processed
branch0.if = `(${typeBinding})==='checkbox'` + ifConditionExtra
addIfCondition(branch0, {
exp: branch0.if,
block: branch0
})
// 2. add radio else-if condition
const branch1 = cloneASTElement(el)
getAndRemoveAttr(branch1, 'v-for', true)
addRawAttr(branch1, 'type', 'radio')
processElement(branch1, options)
addIfCondition(branch0, {
exp: `(${typeBinding})==='radio'` + ifConditionExtra,
block: branch1
})
// 3. other
const branch2 = cloneASTElement(el)
getAndRemoveAttr(branch2, 'v-for', true)
addRawAttr(branch2, ':type', typeBinding)
processElement(branch2, options)
addIfCondition(branch0, {
exp: ifCondition,
block: branch2
})
if (hasElse) {
branch0.else = true
} else if (elseIfCondition) {
branch0.elseif = elseIfCondition
}
return branch0
}
}
}
function cloneASTElement (el) {
return createASTElement(el.tag, el.attrsList.slice(), el.parent)
}
export default {
preTransformNode
}