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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 |