vigour-config/lib/parseValue.js

Observable configuration

'use strict'

var Observable = require('vigour-observable')
var _parseValue = Observable.prototype.parseValue
var pattern = /{(.*?)}/g

exports.define = {
  parseValue: parseConfigValue
}

function parseConfigValue () {
  var val = this._input
  if (typeof val === 'string') {
    var found
    while ((found = pattern.exec(val))) {
      var key = found[1]
      var replacement
      replacement = this[key] || this.lookUp(key)

      if (replacement) {
        replacement = replacement.val
      }
      if (!replacement) {
        pattern.lastIndex = 0
        return null
      }
      var length = found[0].length
      var pre = val.slice(0, found.index)
      var post = val.slice(found.index + length)
      val = pre + replacement + post
      pattern.lastIndex = found.index + replacement.length
    }
    return val
  } else {
    return _parseValue.apply(this, arguments)
  }
}