73 lines
1.6 KiB
JavaScript
73 lines
1.6 KiB
JavaScript
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/*!
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* reading-time
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* Copyright (c) Nicolas Gryman <ngryman@gmail.com>
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module dependencies.
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*/
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const readingTime = require('./reading-time')
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const Transform = require('stream').Transform
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const util = require('util')
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/**
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* @typedef {import('reading-time').Options} Options
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* @typedef {import('reading-time').Options['wordBound']} WordBoundFunction
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* @typedef {import('reading-time').readingTimeStream} ReadingTimeStream
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* @typedef {import('stream').TransformCallback} TransformCallback
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*/
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/**
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* @param {Options} options
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* @returns {ReadingTimeStream}
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*/
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function ReadingTimeStream(options) {
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// allow use without new
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if (!(this instanceof ReadingTimeStream)) {
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return new ReadingTimeStream(options)
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}
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Transform.call(this, { objectMode: true })
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this.options = options || {}
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this.stats = {
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minutes: 0,
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time: 0,
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words: 0
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}
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}
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util.inherits(ReadingTimeStream, Transform)
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/**
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* @param {Buffer} chunk
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* @param {BufferEncoding} encoding
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* @param {TransformCallback} callback
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*/
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ReadingTimeStream.prototype._transform = function(chunk, encoding, callback) {
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const stats = readingTime(chunk.toString(encoding), this.options)
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this.stats.minutes += stats.minutes
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this.stats.time += stats.time
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this.stats.words += stats.words
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callback()
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}
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/**
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* @param {TransformCallback} callback
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*/
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ReadingTimeStream.prototype._flush = function(callback) {
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this.stats.text = Math.ceil(this.stats.minutes.toFixed(2)) + ' min read'
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this.push(this.stats)
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callback()
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}
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/**
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* Export
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*/
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module.exports = ReadingTimeStream
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