358 lines
9.2 KiB
TypeScript
358 lines
9.2 KiB
TypeScript
import {calculateDayInterval} from './calculateDayInterval'
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import {calculateNearestHours} from './calculateNearestHours'
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import {replaceAll} from '../replaceAll'
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interface dateParseResult {
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newText: string,
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date: Date | null,
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}
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interface dateFoundResult {
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foundText: string | null,
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date: Date | null,
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}
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const monthsRegexGroup = '(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)'
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export const parseDate = (text: string, now: Date = new Date()): dateParseResult => {
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const lowerText: string = text.toLowerCase()
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if (lowerText.includes('today')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('today')), 'today')
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}
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if (lowerText.includes('tomorrow')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('tomorrow')), 'tomorrow')
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}
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if (lowerText.includes('next monday')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('nextMonday')), 'next monday')
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}
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if (lowerText.includes('this weekend')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('thisWeekend')), 'this weekend')
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}
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if (lowerText.includes('later this week')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('laterThisWeek')), 'later this week')
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}
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if (lowerText.includes('later next week')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('laterNextWeek')), 'later next week')
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}
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if (lowerText.includes('next week')) {
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return addTimeToDate(text, getDateFromInterval(calculateDayInterval('nextWeek')), 'next week')
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}
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if (lowerText.includes('next month')) {
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const date: Date = new Date()
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date.setDate(1)
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date.setMonth(date.getMonth() + 1)
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date.setHours(calculateNearestHours(date))
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date.setMinutes(0)
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date.setSeconds(0)
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return addTimeToDate(text, date, 'next month')
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}
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if (lowerText.includes('end of month')) {
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const curDate: Date = new Date()
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const date: Date = new Date(curDate.getFullYear(), curDate.getMonth() + 1, 0)
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date.setHours(calculateNearestHours(date))
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date.setMinutes(0)
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date.setSeconds(0)
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return addTimeToDate(text, date, 'end of month')
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}
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let parsed = getDateFromWeekday(text)
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if (parsed.date !== null) {
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return addTimeToDate(text, parsed.date, parsed.foundText)
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}
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parsed = getDayFromText(text)
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if (parsed.date !== null) {
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const month = getMonthFromText(text, parsed.date)
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return addTimeToDate(text, month.date, parsed.foundText)
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}
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parsed = getDateFromTextIn(text, now)
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if (parsed.date !== null) {
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return addTimeToDate(text, parsed.date, parsed.foundText)
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}
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parsed = getDateFromText(text)
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if (parsed.date === null) {
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return {
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newText: replaceAll(text, parsed.foundText, ''),
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date: parsed.date,
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}
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}
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return addTimeToDate(text, parsed.date, parsed.foundText)
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}
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const addTimeToDate = (text: string, date: Date, previousMatch: string | null): dateParseResult => {
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previousMatch = previousMatch?.trim() || ''
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text = replaceAll(text, previousMatch, '')
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if (previousMatch === null) {
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return {
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newText: text,
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date: null,
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}
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}
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const timeRegex = ' (at|@) ([0-9][0-9]?(:[0-9][0-9]?)?( ?(a|p)m)?)'
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const matcher = new RegExp(timeRegex, 'ig')
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const results = matcher.exec(text)
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if (results !== null) {
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const time = results[2]
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const parts = time.split(':')
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let hours = parseInt(parts[0])
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let minutes = 0
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if (time.endsWith('pm')) {
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hours += 12
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}
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if (parts.length > 1) {
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minutes = parseInt(parts[1])
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}
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date.setHours(hours)
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date.setMinutes(minutes)
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date.setSeconds(0)
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}
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const replace = results !== null ? results[0] : previousMatch
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return {
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newText: replaceAll(text, replace, ''),
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date: date,
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}
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}
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export const getDateFromText = (text: string, now: Date = new Date()) => {
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const fullDateRegex = / ([0-9][0-9]?\/[0-9][0-9]?\/[0-9][0-9]([0-9][0-9])?|[0-9][0-9][0-9][0-9]\/[0-9][0-9]?\/[0-9][0-9]?|[0-9][0-9][0-9][0-9]-[0-9][0-9]?-[0-9][0-9]?)/ig
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// 1. Try parsing the text as a "usual" date, like 2021-06-24 or 06/24/2021
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let results: string[] | null = fullDateRegex.exec(text)
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let result: string | null = results === null ? null : results[0]
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let foundText: string | null = result
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let containsYear = true
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if (result === null) {
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// 2. Try parsing the date as something like "jan 21" or "21 jan"
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const monthRegex = new RegExp(` (${monthsRegexGroup} [0-9][0-9]?|[0-9][0-9]? ${monthsRegexGroup})`, 'ig')
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results = monthRegex.exec(text)
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result = results === null ? null : `${results[0]} ${now.getFullYear()}`.trim()
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foundText = results === null ? '' : results[0].trim()
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containsYear = false
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if (result === null) {
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// 3. Try parsing the date as "27/01" or "01/27"
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const monthNumericRegex = / ([0-9][0-9]?\/[0-9][0-9]?)/ig
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results = monthNumericRegex.exec(text)
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// Put the year before or after the date, depending on what works
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result = results === null ? null : `${now.getFullYear()}/${results[0]}`
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if (result === null) {
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return {
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foundText,
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date: null,
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}
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}
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foundText = results === null ? '' : results[0]
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if (result === null || isNaN(new Date(result).getTime())) {
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result = results === null ? null : `${results[0]}/${now.getFullYear()}`
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}
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if (result === null || (isNaN(new Date(result).getTime()) && foundText !== '')) {
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const parts = foundText.split('/')
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result = `${parts[1]}/${parts[0]}/${now.getFullYear()}`
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}
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}
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}
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if (result === null) {
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return {
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foundText,
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date: null,
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}
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}
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const date = new Date(result)
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if (isNaN(date.getTime())) {
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return {
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foundText,
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date: null,
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}
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}
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if (!containsYear && date < now) {
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date.setFullYear(date.getFullYear() + 1)
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}
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return {
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foundText,
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date,
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}
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}
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export const getDateFromTextIn = (text: string, now: Date = new Date()) => {
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const regex = /(in [0-9]+ (hours?|days?|weeks?|months?))/ig
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const results = regex.exec(text)
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if (results === null) {
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return {
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foundText: '',
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date: null,
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}
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}
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const foundText: string = results[0]
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const date = new Date(now)
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const parts = foundText.split(' ')
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switch (parts[2]) {
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case 'hours':
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case 'hour':
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date.setHours(date.getHours() + parseInt(parts[1]))
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break
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case 'days':
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case 'day':
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date.setDate(date.getDate() + parseInt(parts[1]))
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break
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case 'weeks':
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case 'week':
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date.setDate(date.getDate() + parseInt(parts[1]) * 7)
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break
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case 'months':
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case 'month':
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date.setMonth(date.getMonth() + parseInt(parts[1]))
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break
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}
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return {
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foundText,
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date,
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}
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}
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const getDateFromWeekday = (text: string): dateFoundResult => {
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const matcher = / (next )?(monday|mon|tuesday|tue|wednesday|wed|thursday|thu|friday|fri|saturday|sat|sunday|sun)($| )/g
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const results: string[] | null = matcher.exec(text.toLowerCase()) // The i modifier does not seem to work.
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if (results === null) {
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return {
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foundText: null,
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date: null,
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}
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}
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const date: Date = new Date()
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const currentDay: number = date.getDay()
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let day = 0
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switch (results[2]) {
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case 'mon':
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case 'monday':
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day = 1
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break
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case 'tue':
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case 'tuesday':
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day = 2
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break
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case 'wed':
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case 'wednesday':
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day = 3
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break
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case 'thu':
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case 'thursday':
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day = 4
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break
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case 'fri':
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case 'friday':
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day = 5
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break
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case 'sat':
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case 'saturday':
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day = 6
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break
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case 'sun':
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case 'sunday':
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day = 0
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break
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default:
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return {
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foundText: null,
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date: null,
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}
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}
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const distance: number = (day + 7 - currentDay) % 7
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date.setDate(date.getDate() + distance)
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// This a space at the end of the found text to not break parsing suffix strings like "at 14:00" in cases where the
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// matched string comes with a space at the end (last part of the regex).
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let foundText = results[0]
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if (foundText.endsWith(' ')) {
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foundText = foundText.slice(0, foundText.length - 1)
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}
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return {
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foundText: foundText,
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date: date,
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}
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}
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const getDayFromText = (text: string) => {
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const matcher = /($| )(([1-2][0-9])|(3[01])|(0?[1-9]))(st|nd|rd|th|\.)($| )/ig
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const results = matcher.exec(text)
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if (results === null) {
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return {
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foundText: null,
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date: null,
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}
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}
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const now = new Date()
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const date = new Date(now)
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const day = parseInt(results[0])
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date.setDate(day)
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// If the parsed day is the 31st (or 29+ and the next month is february) but the next month only has 30 days,
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// setting the day to 31 will "overflow" the date to the next month, but the first.
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// This would look like a very weired bug. Now, to prevent that, we check if the day is the same as parsed after
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// setting it for the first time and set it again if it isn't - that would mean the month overflowed.
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while (date < now) {
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date.setMonth(date.getMonth() + 1)
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}
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if (date.getDate() !== day) {
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date.setDate(day)
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}
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return {
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foundText: results[0],
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date: date,
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}
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}
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const getMonthFromText = (text: string, date: Date) => {
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const matcher = new RegExp(monthsRegexGroup, 'ig')
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const results = matcher.exec(text)
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if (results === null) {
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return {
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newText: text,
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date,
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}
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}
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const fullDate = new Date(`${results[0]} 1 ${(new Date()).getFullYear()}`)
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date.setMonth(fullDate.getMonth())
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return {
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newText: replaceAll(text, results[0], ''),
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date,
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}
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}
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const getDateFromInterval = (interval: number): Date => {
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const newDate = new Date()
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newDate.setDate(newDate.getDate() + interval)
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newDate.setHours(calculateNearestHours(newDate))
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newDate.setMinutes(0)
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newDate.setSeconds(0)
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return newDate
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}
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