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