@heinlein-video/rrule/src/masks.ts

rrule fork. Includes the src/ folder for typescript sourceMaps

import { range, repeat } from './helpers'

// =============================================================================
// Date masks
// =============================================================================

// Every mask is 7 days longer to handle cross-year weekly periods.

const M365MASK = [
  ...repeat(1, 31),
  ...repeat(2, 28),
  ...repeat(3, 31),
  ...repeat(4, 30),
  ...repeat(5, 31),
  ...repeat(6, 30),
  ...repeat(7, 31),
  ...repeat(8, 31),
  ...repeat(9, 30),
  ...repeat(10, 31),
  ...repeat(11, 30),
  ...repeat(12, 31),
  ...repeat(1, 7),
]

const M366MASK = [
  ...repeat(1, 31),
  ...repeat(2, 29),
  ...repeat(3, 31),
  ...repeat(4, 30),
  ...repeat(5, 31),
  ...repeat(6, 30),
  ...repeat(7, 31),
  ...repeat(8, 31),
  ...repeat(9, 30),
  ...repeat(10, 31),
  ...repeat(11, 30),
  ...repeat(12, 31),
  ...repeat(1, 7),
]

const M28 = range(1, 29)
const M29 = range(1, 30)
const M30 = range(1, 31)
const M31 = range(1, 32)

const MDAY366MASK = [
  ...M31,
  ...M29,
  ...M31,
  ...M30,
  ...M31,
  ...M30,
  ...M31,
  ...M31,
  ...M30,
  ...M31,
  ...M30,
  ...M31,
  ...M31.slice(0, 7),
]

const MDAY365MASK = [
  ...M31,
  ...M28,
  ...M31,
  ...M30,
  ...M31,
  ...M30,
  ...M31,
  ...M31,
  ...M30,
  ...M31,
  ...M30,
  ...M31,
  ...M31.slice(0, 7),
]

const NM28 = range(-28, 0)
const NM29 = range(-29, 0)
const NM30 = range(-30, 0)
const NM31 = range(-31, 0)

const NMDAY366MASK = [
  ...NM31,
  ...NM29,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM31.slice(0, 7),
]

const NMDAY365MASK = [
  ...NM31,
  ...NM28,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM30,
  ...NM31,
  ...NM31.slice(0, 7),
]

const M366RANGE = [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366]
const M365RANGE = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365]

const WDAYMASK = (function () {
  let wdaymask: number[] = []
  for (let i = 0; i < 55; i++) wdaymask = wdaymask.concat(range(7))
  return wdaymask
})()

export {
  WDAYMASK,
  M365MASK,
  M365RANGE,
  M366MASK,
  M366RANGE,
  MDAY365MASK,
  MDAY366MASK,
  NMDAY365MASK,
  NMDAY366MASK,
}