/* @flow */
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import { parseFor } from 'compiler/parser/index'
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import { getAndRemoveAttr, addRawAttr } from 'compiler/helpers'
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export function preTransformVFor (el: ASTElement, options: WeexCompilerOptions) {
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const exp = getAndRemoveAttr(el, 'v-for')
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if (!exp) {
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return
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}
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const res = parseFor(exp)
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if (!res) {
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if (process.env.NODE_ENV !== 'production' && options.warn) {
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options.warn(`Invalid v-for expression: ${exp}`)
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}
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return
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}
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const desc: Object = {
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'@expression': res.for,
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'@alias': res.alias
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}
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if (res.iterator2) {
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desc['@key'] = res.iterator1
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desc['@index'] = res.iterator2
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} else {
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desc['@index'] = res.iterator1
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}
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delete el.attrsMap['v-for']
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addRawAttr(el, '[[repeat]]', desc)
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}
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