Method insertBefore

lib/container.js:163–185

(exist, add)

  }

  insertBefore(exist, add) {
    let existIndex = this.index(exist)
    let type = existIndex === 0 ? 'prepend' : false
    let nodes = this.normalize(
      add,
      this.proxyOf.nodes[existIndex],
      type
    ).reverse()
    existIndex = this.index(exist)
    for (let node of nodes) this.proxyOf.nodes.splice(existIndex, 0, node)

    let index
    for (let id in this.indexes) {
      index = this.indexes[id]
      if (existIndex <= index) {
        this.indexes[id] = index + nodes.length
      }
    }

    this.markDirty()

    return this
  }

  normalize(nodes, sample) {
    if (typeof nodes === 'string') {