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const _progress = Symbol('_progress')
const _onError = Symbol('_onError')
const _setProgress = Symbol('_setProgess')
const npmlog = require('npmlog')
module.exports = cls => class Tracker extends cls {
constructor (options = {}) {
super(options)
this[_setProgress] = !!options.progress
this[_progress] = new Map()
}
addTracker (section, subsection = null, key = null) {
if (section === null || section === undefined) {
this[_onError](`Tracker can't be null or undefined`)
}
if (key === null) {
key = subsection
}
const hasTracker = this[_progress].has(section)
const hasSubtracker = this[_progress].has(`${section}:${key}`)
if (hasTracker && subsection === null) {
// 0. existing tracker, no subsection
this[_onError](`Tracker "${section}" already exists`)
} else if (!hasTracker && subsection === null) {
// 1. no existing tracker, no subsection
// Create a new tracker from npmlog
// starts progress bar
if (this[_setProgress] && this[_progress].size === 0) {
npmlog.enableProgress()
}
this[_progress].set(section, npmlog.newGroup(section))
} else if (!hasTracker && subsection !== null) {
// 2. no parent tracker and subsection
this[_onError](`Parent tracker "${section}" does not exist`)
} else if (!hasTracker || !hasSubtracker) {
// 3. existing parent tracker, no subsection tracker
// Create a new subtracker in this[_progress] from parent tracker
this[_progress].set(`${section}:${key}`,
this[_progress].get(section).newGroup(`${section}:${subsection}`)
)
}
// 4. existing parent tracker, existing subsection tracker
// skip it
}
finishTracker (section, subsection = null, key = null) {
if (section === null || section === undefined) {
this[_onError](`Tracker can't be null or undefined`)
}
if (key === null) {
key = subsection
}
const hasTracker = this[_progress].has(section)
const hasSubtracker = this[_progress].has(`${section}:${key}`)
// 0. parent tracker exists, no subsection
// Finish parent tracker and remove from this[_progress]
if (hasTracker && subsection === null) {
// check if parent tracker does
// not have any remaining children
const keys = this[_progress].keys()
for (const key of keys) {
if (key.match(new RegExp(section + ':'))) {
this.finishTracker(section, key)
}
}
// remove parent tracker
this[_progress].get(section).finish()
this[_progress].delete(section)
// remove progress bar if all
// trackers are finished
if (this[_setProgress] && this[_progress].size === 0) {
npmlog.disableProgress()
}
} else if (!hasTracker && subsection === null) {
// 1. no existing parent tracker, no subsection
this[_onError](`Tracker "${section}" does not exist`)
} else if (!hasTracker || hasSubtracker) {
// 2. subtracker exists
// Finish subtracker and remove from this[_progress]
this[_progress].get(`${section}:${key}`).finish()
this[_progress].delete(`${section}:${key}`)
}
// 3. existing parent tracker, no subsection
}
[_onError] (msg) {
if (this[_setProgress]) {
npmlog.disableProgress()
}
throw new Error(msg)
}
}