Julia Friesel
46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
import objectPath from 'object-path'
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import { Base64 } from 'js-base64'
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import { cycleDaysSortedByDate } from '../../db'
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import getColumnNamesForCsv from './get-csv-column-names'
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export default function makeDataURI() {
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if (!cycleDaysSortedByDate.length) return null
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const csv = transformToCsv(cycleDaysSortedByDate)
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const encoded = Base64.encodeURI(csv)
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// this is the MIME type android/libcore/MimeUtils expects, so we oblige
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return `data:text/comma-separated-values;base64,${encoded}`
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}
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function transformToCsv(cycleDays) {
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const columnNames = getColumnNamesForCsv()
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const rows = cycleDays
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.map(day => {
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return columnNames.map(column => {
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const val = objectPath.get(day, column)
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return typeof val === 'string' ? csvify(val) : val
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})
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})
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.map(row => row.join(','))
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rows.unshift(columnNames.join(','))
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return rows.join('\n')
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}
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function csvify (val) {
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// we wrap fields with special characters in quotes,
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// thus have to escape actual quotes
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val = val.replace(/"/g, '""')
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val = val.toLowerCase()
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const hasSpecialChars = (
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val.includes('\n') ||
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val.includes('\t') ||
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val.includes(',') ||
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val.includes(';') ||
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val.includes('.') ||
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val.includes('\'')
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)
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return hasSpecialChars ? `"${val}"` : val
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} |