diffcunha/jsonmltoreact

import React from 'react'
import JsonML from 'jsonml.js/lib/utils'
import { toStyleObject } from './utils'

/**
 * JsonmlToReact class
 */
export default class JsonmlToReact {
  /**
   * Constructor
   * @param {Object} converters - Aditional converters
   */
  constructor (converters = {}) {
    this.converters = converters
  }

  /**
   * Visit JsonML nodes recursively and convert to React
   * @param {Array} node - JsonML structure
   * @param {Number} index - Node index to be used as key
   * @param {Object} [data] - Data to be passed to the converters
   * @returns {Object} React component
   * @private
   */
  _visit (node, index, data) {
    // Is leaf node
    if (!node || typeof node === 'string') {
      return node
    }

    let attrs = Object.assign({ key: index }, JsonML.getAttributes(node))

    if (attrs.class) {
      attrs.className = attrs.class
      attrs.class = undefined
    }
    if (attrs.style) {
      attrs.style = toStyleObject(attrs.style)
    }

    const tag = JsonML.getTagName(node)
    const converter = this.converters[tag]
    const result = converter ? converter(attrs, data) : {}

    const type = result.type || tag
    const props = result.props || attrs

    // reassign key in case `converter` removed it
    props.key = props.key || index

    const children = JsonML.getChildren(node)

    if (!children || children.length === 0) {
      return React.createElement(type, props)
    }

    return React.createElement(type, props, children.map((child, index) => this._visit(child, index, data)))
  }

  /**
   * Convert JsonML to React component
   * @param {Array} jsonml - JsonML structure
   * @param {Object} [data] - Data to be passed to the converters
   * @returns {Object} React component
   */
  convert (jsonml, data) {
    return this._visit(jsonml, 0, data)
  }
}