index.js

const visit = require("unist-util-visit")
const toString = require("mdast-util-to-string")
const gridTablesParser = require('remark-grid-tables')

const pattern = /[\u2E80-\u2EFF\u2F00-\u2FDF\u3000-\u303F\u31C0-\u31EF\u3200-\u32FF\u3300-\u33FF\u3400-\u4DBF\u4DC0-\u4DFF\u4E00-\u9FBF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF]/

const isTranslation = text => text && pattern.test(text)

module.exports = async ({ markdownAST }) => {

  visit(markdownAST, (node, index, parent) => {
    
    const type = node.type
    
    if (type !== 'heading' && type !== 'paragraph') {
      return
    }

    !node.data && (node.data = {})

    if (index === 0 || !isTranslation(toString(node))) {
      return
    }

    const previous = parent.children[index - 1]

    if (!isTranslation(toString(previous)) && isTranslation(toString(node)) && previous.type === type) {

      if (previous.data.hProperties && previous.data.hProperties["translation-origin"]) {
        return
      }
      
      node.data.hProperties = {
        ...node.data.hProperties,
        "translation-result": "on"
      }
      
      previous.data.hProperties = {
        ...previous.data.hProperties,
        "translation-origin": "off"
      }
      
      type === 'heading' && (previous.data.hProperties = {
        ...previous.data.hProperties,
        "id": toString(node)
      })

      if (type === 'heading') {
        const isLink = element => element.type === 'link'
        const index1 = node.children.findIndex(isLink)
        const index2 = previous.children.findIndex(isLink)
        if (index1 !== -1 && index2 !== -1) {
          previous.children[index2].url = node.children[index1].url
        }
      }
      
      parent.children.splice(index - 1, 1, parent.children[index])
      parent.children.splice(index, 1, previous)

    }
  })

  return markdownAST
}

module.exports.setParserPlugins = () => [gridTablesParser]