intval3/lib/sequence/index.js

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'use strict'
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const log = require('../log')('seq')
/** Object sequence features */
const sequence = {};
sequence._state = {
arr : [],
active : false,
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paused : false,
frame: false,
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delay : false,
count : 0,
stop : null
}
sequence._loop = {
arr : [],
count : 0,
max : 0
}
sequence.start = function (options, cb) {
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sequence._state.active = true
sequence._state.count = 0
if (options.arr) {
sequence._state.arr = options.arr
}
if (options.loop) {
sequence._loop.arr = options.loop
sequence._loop.count = 0
}
if (options.maxLoop) {
sequence._loop.max = options.maxLoop
} else {
sequence._loop.max = 0
}
sequence._state.stop = cb
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sequence.step()
}
sequence.setStop = function (cb) {
sequence._state.active = false
sequence._state.input = cb
}
sequence.stop = function () {
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sequence._state.active = false
sequence._state.count = 0
sequence._state.arr = []
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sequence._loop.count = 0
sequence._loop.max = 0
sequence._loop.arr = []
if (sequence._state.stop) sequence._state.stop()
if (sequence._state.input) sequence._state.input()
sequence._state.stop = null
sequence._state.input = null
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}
sequence.pause = function () {
sequence._state.paused = true
}
sequence.resume = function () {
sequence._state.paused = false
sequence.step()
}
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sequence.step = function () {
log.info('step', `Started step ${sequence._state.count}`)
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if (sequence._state.active && !sequence._state.paused) {
if (sequence._state.arr.length > 0) {
if (sequence._state.count > sequence._state.arr.length - 1) {
return sequence.stop()
}
log.info('step', sequence._state.count)
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return sequence._state.arr[sequence._state.count](() => {
sequence._state.count++
sequence.step()
})
} else if (sequence._loop.arr.length > 0) {
if (sequence._state.count > sequence._loop.arr.length - 1) {
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sequence._state.count = 0
sequence._loop.count++
}
if (sequence._loop.max > 0 && sequence._loop.count > sequence._loop.max) {
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return sequence.stop()
}
log.info('step', sequence._state.count)
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return sequence._loop.arr[sequence._state.count](() => {
sequence._state.count++
sequence.step()
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})
} else{
return sequence.stop()
}
} else if (sequence._state.paused) {
log.info('step', 'Sequence paused', { loop : sequence._loop.count, count : sequence._state.count })
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} else if (!sequence._state.active) {
log.info('step', 'Sequence stopped', { loop : sequence._loop.count, count : sequence._state.count })
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}
}
module.exports = sequence