/* @flow */
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/**
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* unicode letters used for parsing html tags, component names and property paths.
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* using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
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* skipping \u10000-\uEFFFF due to it freezing up PhantomJS
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*/
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export const unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/
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/**
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* Check if a string starts with $ or _
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*/
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export function isReserved (str: string): boolean {
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const c = (str + '').charCodeAt(0)
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return c === 0x24 || c === 0x5F
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}
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/**
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* Define a property.
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*/
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export function def (obj: Object, key: string, val: any, enumerable?: boolean) {
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Object.defineProperty(obj, key, {
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value: val,
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enumerable: !!enumerable,
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writable: true,
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configurable: true
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})
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}
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/**
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* Parse simple path.
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*/
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const bailRE = new RegExp(`[^${unicodeRegExp.source}.$_\\d]`)
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export function parsePath (path: string): any {
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if (bailRE.test(path)) {
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return
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}
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const segments = path.split('.')
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return function (obj) {
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for (let i = 0; i < segments.length; i++) {
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if (!obj) return
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obj = obj[segments[i]]
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}
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return obj
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}
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}
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