/* @flow */
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// import { warn } from 'core/util/index'
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// this will be preserved during build
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// $flow-disable-line
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const acorn = require('acorn') // $flow-disable-line
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const walk = require('acorn/dist/walk') // $flow-disable-line
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const escodegen = require('escodegen')
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export function nodeToBinding (node: Object): any {
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switch (node.type) {
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case 'Literal': return node.value
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case 'Identifier':
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case 'UnaryExpression':
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case 'BinaryExpression':
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case 'LogicalExpression':
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case 'ConditionalExpression':
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case 'MemberExpression': return { '@binding': escodegen.generate(node) }
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case 'ArrayExpression': return node.elements.map(_ => nodeToBinding(_))
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case 'ObjectExpression': {
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const object = {}
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node.properties.forEach(prop => {
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if (!prop.key || prop.key.type !== 'Identifier') {
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return
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}
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const key = escodegen.generate(prop.key)
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const value = nodeToBinding(prop.value)
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if (key && value) {
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object[key] = value
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}
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})
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return object
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}
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default: {
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// warn(`Not support ${node.type}: "${escodegen.generate(node)}"`)
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return ''
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}
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}
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}
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export function generateBinding (exp: ?string): any {
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if (exp && typeof exp === 'string') {
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let ast = null
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try {
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ast = acorn.parse(`(${exp})`)
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} catch (e) {
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// warn(`Failed to parse the expression: "${exp}"`)
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return ''
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}
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let output = ''
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walk.simple(ast, {
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Expression (node) {
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output = nodeToBinding(node)
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}
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})
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return output
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}
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}
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