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/* @flow */
import { parseText } from 'compiler/parser/text-parser'
import {
getAndRemoveAttr,
getBindingAttr,
baseWarn
} from 'compiler/helpers'
type StaticClassResult = {
dynamic: boolean,
classResult: string
};
function transformNode (el: ASTElement, options: CompilerOptions) {
const warn = options.warn || baseWarn
const staticClass = getAndRemoveAttr(el, 'class')
const { dynamic, classResult } = parseStaticClass(staticClass, options)
if (process.env.NODE_ENV !== 'production' && dynamic && staticClass) {
warn(
`class="${staticClass}": ` +
'Interpolation inside attributes has been deprecated. ' +
'Use v-bind or the colon shorthand instead.',
el.rawAttrsMap['class']
)
}
if (!dynamic && classResult) {
el.staticClass = classResult
}
const classBinding = getBindingAttr(el, 'class', false /* getStatic */)
if (classBinding) {
el.classBinding = classBinding
} else if (dynamic) {
el.classBinding = classResult
}
}
function genData (el: ASTElement): string {
let data = ''
if (el.staticClass) {
data += `staticClass:${el.staticClass},`
}
if (el.classBinding) {
data += `class:${el.classBinding},`
}
return data
}
function parseStaticClass (staticClass: ?string, options: CompilerOptions): StaticClassResult {
// "a b c" -> ["a", "b", "c"] => staticClass: ["a", "b", "c"]
// "a {{x}} c" -> ["a", x, "c"] => classBinding: '["a", x, "c"]'
let dynamic = false
let classResult = ''
if (staticClass) {
const classList = staticClass.trim().split(' ').map(name => {
const result = parseText(name, options.delimiters)
if (result) {
dynamic = true
return result.expression
}
return JSON.stringify(name)
})
if (classList.length) {
classResult = '[' + classList.join(',') + ']'
}
}
return { dynamic, classResult }
}
export default {
staticKeys: ['staticClass'],
transformNode,
genData
}