/* @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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/**
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* Map the following syntax to corresponding attrs:
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*
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* <recycle-list for="(item, i) in longList" switch="cellType">
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* <cell-slot case="A"> ... </cell-slot>
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* <cell-slot case="B"> ... </cell-slot>
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* </recycle-list>
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*/
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export function preTransformRecycleList (
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el: ASTElement,
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options: WeexCompilerOptions
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) {
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const exp = getAndRemoveAttr(el, 'for')
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if (!exp) {
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if (options.warn) {
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options.warn(`Invalid <recycle-list> syntax: missing "for" expression.`)
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}
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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 (options.warn) {
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options.warn(`Invalid <recycle-list> syntax: ${exp}.`)
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}
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return
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}
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addRawAttr(el, ':list-data', res.for)
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addRawAttr(el, 'binding-expression', res.for)
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addRawAttr(el, 'alias', res.alias)
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if (res.iterator2) {
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// (item, key, index) for object iteration
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// is this even supported?
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addRawAttr(el, 'index', res.iterator2)
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} else if (res.iterator1) {
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addRawAttr(el, 'index', res.iterator1)
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}
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const switchKey = getAndRemoveAttr(el, 'switch')
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if (switchKey) {
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addRawAttr(el, 'switch', switchKey)
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}
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}
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