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next.js/lib/app.js

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import React, { Component, PropTypes } from 'react'
export default class App extends Component {
static childContextTypes = {
router: PropTypes.object,
headManager: PropTypes.object
}
constructor (props) {
super(props)
this.state = propsToState(props)
this.close = null
}
componentWillReceiveProps (nextProps) {
const state = propsToState(nextProps)
try {
this.setState(state)
} catch (err) {
console.error(err)
}
}
componentDidMount () {
const { router } = this.props
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this.close = router.subscribe((data) => {
const props = data.props || this.state.props
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const state = propsToState({
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...data,
props,
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router
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})
try {
this.setState(state)
} catch (err) {
console.error(err)
}
})
}
componentWillUnmount () {
if (this.close) this.close()
}
getChildContext () {
const { router, headManager } = this.props
return { router, headManager }
}
render () {
const { Component, props } = this.state
return React.createElement(Component, { ...props })
}
}
function propsToState (props) {
const { Component, router } = props
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const { route } = router
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const url = {
query: router.query,
pathname: router.pathname,
back: () => router.back(),
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push: (url) => router.push(route, url),
pushTo: (url) => router.push(null, url),
replace: (url) => router.replace(route, url),
replaceTo: (url) => router.replace(null, url)
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}
return {
Component,
props: { ...props.props, url }
}
}