# all files / pdf2images-multiple/ index.js

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96.3% Branches 52/54
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100% Lines 146/146

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    1×var PDFImage = require('pdf-image').PDFImage
    var path = require('path');

    function range (begin_int, end_int) {
    	var arr = [],
    	    i = begin_int

    	while(i < end_int) {
    		arr.push(i)

    		++i
    	}

    	return arr
    }

    function PDF2Images (pdf_file_path, options) {

    	var self = {}
    	self.pdf = {}
    	self.img = {}

    	self.ConstructorFunc = function () {
    		self.img.paths = []
    		self.pdf.f_converting = []

    		self.img.default_format = 'png'

    		self.pdf.file_path = pdf_file_path
    		self.options = options

    		self.pdf.gpn_working = false

    		self.pdf.file_name_ext = path.basename(self.pdf.file_path)
    		self.pdf.file_name = self.pdf.file_name_ext.split('.')[0]
    		self.pdf.dirname = path.dirname(self.pdf.file_path)

    		self.pdf.set_PDFImage()

    		self.pdf.set_page_number()
    	}

    	self.pdf.convert_page = function (page, callback) {
    		var pdfImg = self.pdf.PDFImage
    		var success_cb, error_cb

    		success_cb = (image_path) => {
    			self.img.add_path(image_path)

    			callback(null, image_path)
    		}

    		error_cb = (err) => {
    			callback(err)
    		}

    		pdfImg.convertPage(page).then(success_cb, error_cb)
    	}

    	self.pdf.convert_pages = function (pages_arr, page_cb, final_cb) {
    		var length = pages_arr.length

    		if ( ! length ) return final_cb(new Error('pages_arr is empty'))

    		var begin_img_path_length = self.img.paths.length
    		var fail = false
    		var callback = (err, image_path) => {
    	  	if (err) {
    	  		fail = true
    	  		return page_cb(err)
    	  	}

    	  	page_cb(null, image_path)

    	  	if (pages_arr.length == 1 || pages_arr.length == (self.img.paths.length - begin_img_path_length)) {
    	  		final_cb(null, self.img.paths)
    	  	}
    	  }

    	  var val

    		while ( ! fail && length ) {
    			--length
    			val = pages_arr[length]

    			if ( isNaN(val) ) {
    				fail = true
    				return callback(new Error('pages_arr contains invalid value: "' + val + '"'))
    			}

    			self.pdf.convert_page(val, callback)
    		}
    	}

    	self.pdf.convert = function (page_cb, final_cb) {
    		self.pdf.convert_chunks(page_cb, final_cb)
    	}

    	self.pdf.convert_chunks = function (page_cb, final_cb, chunks_numb) {
    		var get_page_cb = (err, pages) => {
    			if (err) {
    				return final_cb(err)
    			}

    			begin = self.pdf.f_converting.length + self.img.paths.length

    			var end = begin + chunks_numb
    			end = chunks_numb && end <= pages ? end : pages

    			var pages_chunk_arr = range(begin, end)
    			var convert_one = 1
    			var image_path_number

    			self.pdf.add_to_converting(pages_chunk_arr)

    			var cc_final_cb = (err, images_paths) => {
    				console.log(self.img.paths.length == pages)
    				console.log(self.img.paths.length, pages)
    				if (err) return final_cb(err)
    				if ( self.img.paths.length == pages ) return final_cb(null, self.img.paths)
    			}

    			self.pdf.convert_pages(pages_chunk_arr, (err, image_path) => {
    				Iif (err) return page_cb(err)

    				image_path_number = self.img.get_image_path_number(image_path)

    				self.pdf.remove_to_converting([image_path_number])

    				begin = self.pdf.f_converting.length + self.img.paths.length

    				if ( begin < pages ) {
    					self.pdf.convert_chunks(page_cb, cc_final_cb, convert_one)
    				}

    				page_cb(null, image_path)

    			}, cc_final_cb)
    		}

    		self.pdf.get_page_number(get_page_cb)
    	}

    	self.pdf.set_PDFImage = function () {
    		self.pdf.PDFImage = new PDFImage(self.pdf.file_path, {
    			convertExtension: self.options.ext || self.img.get_default_format(),
    			outputDirectory: self.options.output_dir,
    			convertOptions: self.options.convert_options
    		})

    		self.pdf.PDFImage.pdfFileBaseName = self.options.base_name || self.pdf.get_file_name()
    		self.pdf.PDFImage.useGM = self.options.gm || false
    	}

    	self.pdf.set_page_number = function (cb) {
    		if ( self.pdf.pages != undefined ) {
    			return cb ? cb() : undefined
    		}

    		var callback = (err, pages) => {
    			if (err && cb) return cb(err)
    			if (err) return

    			self.pdf.pages = pages
    		}

    		self.pdf.get_page_number(callback)
    	}

    	self.pdf.get_page_number = function (cb) {
    		if ( self.pdf.gpn_working ) return setTimeout(() => self.pdf.get_page_number(cb), 0)
    		self.pdf.gpn_working = true

    		if ( self.pdf.pages != undefined ) {
    			self.pdf.gpn_working = false
    			return cb(null, self.pdf.pages)
    		}

    		var callback = (pages) => {
    			cb(null, Number(pages))
    			self.pdf.gpn_working = false
    		}
    		var e_cb = (error) => {
    			cb(error)
    			self.pdf.gpn_working = false
    		}

    		self.pdf.PDFImage.numberOfPages().then(callback, e_cb)

    	}

    	self.pdf.get_file_name_ext = function () {
    		return self.pdf.file_name_ext
    	}

    	self.pdf.get_file_name = function () {
    		return self.pdf.file_name
    	}

    	self.pdf.get_dirname = function () {
    		return self.pdf.dirname
    	}

    	self.img.get_default_format = function () {
    		return self.img.default_format
    	}

    	self.img.add_path = function (path) {
    		self.add_foo_not_repeat(self.img.paths, path)
    	}

    	self.img.get_image_path_number = function (image_path) {
    		var splitted = image_path.split(/-|\./)

    		return Number(splitted[splitted.length - 2])
    	}

    	self.pdf.add_to_converting = function (pages) {
    		var length = pages.length

    		while (length) {
    			--length

    			self.add_foo_not_repeat(self.pdf.f_converting, pages[length])
    		}
    	}

    	self.pdf.remove_to_converting = function (pages) {
    		if ( ! pages || ! Array.isArray(pages) ) return

    		var f_converting_length = self.pdf.f_converting.length
    		var pages_length = pages.length
    		var new_arr = []
    		var indexs_to_del = []
    		var page_numb

    		while (pages_length) {
    			--pages_length
    			indexs_to_del.push(self.pdf.f_converting.indexOf(pages[pages_length]))
    		}

    		while (f_converting_length) {
    			--f_converting_length
    			page_numb = self.pdf.f_converting[f_converting_length]

    			if ( indexs_to_del.indexOf(f_converting_length) == -1 ) {
    				new_arr.unshift(page_numb)
    			}
    		}

    		self.pdf.f_converting = new_arr

    	}

    	self.add_foo_not_repeat = function (arr, value) {
    		var index = arr.indexOf(value)

    		Eif ( index === -1 ) {
    			arr.push(value)
    		}
    	}

    	self.ConstructorFunc()

    	return self

    }

    module.exports = PDF2Images