126 lines
3.3 KiB
JavaScript
126 lines
3.3 KiB
JavaScript
'use strict'
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var extend = require('xtend/mutable')
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module.exports = PostgresInterval
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function PostgresInterval (raw) {
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if (!(this instanceof PostgresInterval)) {
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return new PostgresInterval(raw)
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}
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extend(this, parse(raw))
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}
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var properties = ['seconds', 'minutes', 'hours', 'days', 'months', 'years']
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PostgresInterval.prototype.toPostgres = function () {
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var filtered = properties.filter(this.hasOwnProperty, this)
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// In addition to `properties`, we need to account for fractions of seconds.
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if (this.milliseconds && filtered.indexOf('seconds') < 0) {
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filtered.push('seconds')
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}
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if (filtered.length === 0) return '0'
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return filtered
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.map(function (property) {
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var value = this[property] || 0
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// Account for fractional part of seconds,
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// remove trailing zeroes.
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if (property === 'seconds' && this.milliseconds) {
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value = (value + this.milliseconds / 1000).toFixed(6).replace(/\.?0+$/, '')
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}
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return value + ' ' + property
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}, this)
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.join(' ')
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}
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var propertiesISOEquivalent = {
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years: 'Y',
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months: 'M',
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days: 'D',
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hours: 'H',
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minutes: 'M',
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seconds: 'S'
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}
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var dateProperties = ['years', 'months', 'days']
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var timeProperties = ['hours', 'minutes', 'seconds']
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// according to ISO 8601
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PostgresInterval.prototype.toISOString = PostgresInterval.prototype.toISO = function () {
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var datePart = dateProperties
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.map(buildProperty, this)
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.join('')
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var timePart = timeProperties
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.map(buildProperty, this)
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.join('')
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return 'P' + datePart + 'T' + timePart
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function buildProperty (property) {
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var value = this[property] || 0
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// Account for fractional part of seconds,
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// remove trailing zeroes.
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if (property === 'seconds' && this.milliseconds) {
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value = (value + this.milliseconds / 1000).toFixed(6).replace(/0+$/, '')
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}
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return value + propertiesISOEquivalent[property]
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}
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}
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var NUMBER = '([+-]?\\d+)'
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var YEAR = NUMBER + '\\s+years?'
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var MONTH = NUMBER + '\\s+mons?'
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var DAY = NUMBER + '\\s+days?'
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var TIME = '([+-])?([\\d]*):(\\d\\d):(\\d\\d)\\.?(\\d{1,6})?'
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var INTERVAL = new RegExp([YEAR, MONTH, DAY, TIME].map(function (regexString) {
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return '(' + regexString + ')?'
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})
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.join('\\s*'))
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// Positions of values in regex match
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var positions = {
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years: 2,
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months: 4,
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days: 6,
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hours: 9,
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minutes: 10,
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seconds: 11,
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milliseconds: 12
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}
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// We can use negative time
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var negatives = ['hours', 'minutes', 'seconds', 'milliseconds']
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function parseMilliseconds (fraction) {
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// add omitted zeroes
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var microseconds = fraction + '000000'.slice(fraction.length)
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return parseInt(microseconds, 10) / 1000
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}
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function parse (interval) {
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if (!interval) return {}
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var matches = INTERVAL.exec(interval)
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var isNegative = matches[8] === '-'
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return Object.keys(positions)
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.reduce(function (parsed, property) {
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var position = positions[property]
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var value = matches[position]
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// no empty string
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if (!value) return parsed
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// milliseconds are actually microseconds (up to 6 digits)
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// with omitted trailing zeroes.
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value = property === 'milliseconds'
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? parseMilliseconds(value)
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: parseInt(value, 10)
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// no zeros
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if (!value) return parsed
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if (isNegative && ~negatives.indexOf(property)) {
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value *= -1
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}
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parsed[property] = value
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return parsed
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}, {})
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}
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