bootstrap-vue/src/utils/router.js

BootstrapVue, with over 40 plugins and more than 80 custom components, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated WAI-ARIA accessibility markup.

import toString from './to-string'
import { isArray, isNull, isPlainObject, isString, isUndefined } from './inspect'
import { keys } from './object'

const ANCHOR_TAG = 'a'

// Precompile RegExp
const commaRE = /%2C/g
const encodeReserveRE = /[!'()*]/g
// Method to replace reserved chars
const encodeReserveReplacer = c => '%' + c.charCodeAt(0).toString(16)

// Fixed encodeURIComponent which is more conformant to RFC3986:
// - escapes [!'()*]
// - preserve commas
const encode = str =>
  encodeURIComponent(toString(str))
    .replace(encodeReserveRE, encodeReserveReplacer)
    .replace(commaRE, ',')

const decode = decodeURIComponent

// Stringifies an object of query parameters
// See: https://github.com/vuejs/vue-router/blob/dev/src/util/query.js
export const stringifyQueryObj = obj => {
  if (!isPlainObject(obj)) {
    return ''
  }

  const query = keys(obj)
    .map(key => {
      const val = obj[key]
      if (isUndefined(val)) {
        return ''
      } else if (isNull(val)) {
        return encode(key)
      } else if (isArray(val)) {
        return val
          .reduce((results, val2) => {
            if (isNull(val2)) {
              results.push(encode(key))
            } else if (!isUndefined(val2)) {
              // Faster than string interpolation
              results.push(encode(key) + '=' + encode(val2))
            }
            return results
          }, [])
          .join('&')
      }
      // Faster than string interpolation
      return encode(key) + '=' + encode(val)
    })
    /* must check for length, as we only want to filter empty strings, not things that look falsey! */
    .filter(x => x.length > 0)
    .join('&')

  return query ? `?${query}` : ''
}

export const parseQuery = query => {
  const parsed = {}
  query = toString(query)
    .trim()
    .replace(/^(\?|#|&)/, '')

  if (!query) {
    return parsed
  }

  query.split('&').forEach(param => {
    const parts = param.replace(/\+/g, ' ').split('=')
    const key = decode(parts.shift())
    const val = parts.length > 0 ? decode(parts.join('=')) : null

    if (isUndefined(parsed[key])) {
      parsed[key] = val
    } else if (isArray(parsed[key])) {
      parsed[key].push(val)
    } else {
      parsed[key] = [parsed[key], val]
    }
  })

  return parsed
}

export const isRouterLink = tag => toString(tag).toLowerCase() !== ANCHOR_TAG

export const computeTag = ({ to, disabled } = {}, thisOrParent) => {
  return thisOrParent.$router && to && !disabled
    ? thisOrParent.$nuxt
      ? 'nuxt-link'
      : 'router-link'
    : ANCHOR_TAG
}

export const computeRel = ({ target, rel } = {}) => {
  if (target === '_blank' && isNull(rel)) {
    return 'noopener'
  }
  return rel || null
}

export const computeHref = (
  { href, to } = {},
  tag = ANCHOR_TAG,
  fallback = '#',
  toFallback = '/'
) => {
  // We've already checked the $router in computeTag(), so isRouterLink() indicates a live router.
  // When deferring to Vue Router's router-link, don't use the href attribute at all.
  // We return null, and then remove href from the attributes passed to router-link
  if (isRouterLink(tag)) {
    return null
  }

  // Return `href` when explicitly provided
  if (href) {
    return href
  }

  // Reconstruct `href` when `to` used, but no router
  if (to) {
    // Fallback to `to` prop (if `to` is a string)
    if (isString(to)) {
      return to || toFallback
    }
    // Fallback to `to.path + to.query + to.hash` prop (if `to` is an object)
    if (isPlainObject(to) && (to.path || to.query || to.hash)) {
      const path = toString(to.path)
      const query = stringifyQueryObj(to.query)
      let hash = toString(to.hash)
      hash = !hash || hash.charAt(0) === '#' ? hash : `#${hash}`
      return `${path}${query}${hash}` || toFallback
    }
  }

  // If nothing is provided return the fallback
  return fallback
}