# All files / utils rawFluxDataTable.ts

83.63% Statements 46/55
45.45% Branches 5/11
75% Functions 6/8
81.25% Lines 39/48

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     import Papa from 'papaparse'
    import HtmlEntities from 'he'
    import unraw from 'unraw'

    import {parseChunks} from './fluxParsing'
    import {
      CSV_OBJECT_BASE_NAME,
      CSV_OBJECT_START_STRING,
      CSV_OBJECT_END_STRING,
    } from '../constants/rawFluxData'

    export interface ParseFilesResult {
      data: string[][]
      maxColumnCount: number
    }

    export const parseFiles = (responses: string[]): ParseFilesResult => {
      const chunks = parseChunks(responses.join('\n\n'))
      const parsedChunks = chunks.map(c => Papa.parse(c).data)
      const maxColumnCount = Math.max(...parsedChunks.map(c => c[0].length))
      const data = []

      for (let i = 0; i < parsedChunks.length; i++) {
        if (i !== 0) {
          // Seperate each chunk by an empty line, just like in the unparsed CSV
          data.push([])
        }

        for (let j = 0; j < parsedChunks[i].length; j++) {
          // Danger zone! Since the contents of each chunk are potentially quite
          // large, the contents need to be concated using a loop rather than with
          // `concat`, a splat or similar. Otherwise we see a "Maximum call size
          // exceeded" error for large CSVs
          data.push(parsedChunks[i][j])
        }
      }

      return {data, maxColumnCount}
    }

    export const parseFilesWithObjects = (
      responses: string[]
    ): ParseFilesResult => {
      const chunks = parseChunks(responses.join('\n\n'))
      const parsedChunks = chunks.map(c => {
        const objList = []
        let updatedString = c
        let startIndex = 0
        let endIndex = 0

        /* ********************************************************************
         * Parse objects in the CSV by decoding the html and removing
         * the following inside the objects, so that the stringified version is
         * parsable by JSON.parse and becomes useful to the user:
         *   - double double-quotes
         *   - escaped double-quotes
         *   - newlines
         *   - tabs
         *   - escaped null
         */
        while (startIndex !== -1 && endIndex !== -1) {
          startIndex = updatedString.indexOf(CSV_OBJECT_START_STRING)
          endIndex = updatedString.indexOf(CSV_OBJECT_END_STRING)
          Iif (startIndex !== -1 && endIndex !== -1) {
            objList.push(
              unraw(
                HtmlEntities.decode(
                  updatedString.slice(
                    startIndex + CSV_OBJECT_START_STRING.length - 1,
                    endIndex + 1
                  )
                )
                  .replace(/""/g, '"')
                  .replace(/:",/g, ':"",')
                  .replace(/"","}/g, '","}')
                  .replace(/\\"/g, '')
                  .replace(/\\n/g, ' ')
                  .replace(/\\t/g, '')
                  .replace(/\\u0000/g, '')
              )
            )
            updatedString =
              updatedString.slice(0, startIndex + 1) +
              `${CSV_OBJECT_BASE_NAME}${objList.length - 1}` +
              updatedString.slice(endIndex + CSV_OBJECT_END_STRING.length - 1)
          }
        }

        const {data} = Papa.parse(updatedString)

        // After we parse the CSV, if we have a list of parsed objects
        //   go back and re-insert them
        let iterator = 0
        objList.forEach((obj, objIndex) => {
          let dataIndex = -1
          while (iterator < data.length && dataIndex === -1) {
            dataIndex = data[iterator].findIndex(
              element => element === `${CSV_OBJECT_BASE_NAME}${objIndex}`
            )
            if (dataIndex > -1) {
              data[iterator][dataIndex] = data[iterator][dataIndex].replace(
                `${CSV_OBJECT_BASE_NAME}${objIndex}`,
                obj
              )
            } else {
              iterator += 1
            }
          }
        })

        return data
      })
      const maxColumnCount = Math.max(...parsedChunks.map(c => c[0].length))
      const data = []

      for (let i = 0; i < parsedChunks.length; i++) {
        if (i !== 0) {
          // Separate each chunk by an empty line, just like in the unparsed CSV
          data.push([])
        }

        for (let j = 0; j < parsedChunks[i].length; j++) {
          // Danger zone! Since the contents of each chunk are potentially quite
          // large, the contents need to be concated using a loop rather than with
          // `concat`, a splat or similar. Otherwise we see a "Maximum call size
          // exceeded" error for large CSVs
          data.push(parsedChunks[i][j])
        }
      }

      return {data, maxColumnCount}
    }