REFACTOR style and PEP8, fixes #66
This commit is contained in:
Patrick Kanzler
parent
096445631f
commit
07d8e073ae
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@ -12,27 +12,26 @@ except ImportError:
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from PIL import Image
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import qrcode
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import time
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from constants import *
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from exceptions import *
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class Escpos(object):
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""" ESC/POS Printer object """
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device = None
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def _check_image_size(self, size):
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@staticmethod
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def _check_image_size(size):
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""" Check and fix the size of the image to 32 bits """
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if size % 32 == 0:
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return (0, 0)
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return 0, 0
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else:
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image_border = 32 - (size % 32)
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if (image_border % 2) == 0:
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return (image_border / 2, image_border / 2)
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return image_border / 2, image_border / 2
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else:
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return (image_border / 2, (image_border / 2) + 1)
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return image_border / 2, (image_border / 2) + 1
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def _print_image(self, line, size):
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""" Print formatted image """
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@ -55,7 +54,6 @@ class Escpos(object):
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buffer = ""
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cont = 0
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def _convert_image(self, im):
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""" Parse image and prepare it to a printable format """
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pixels = []
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@ -65,7 +63,6 @@ class Escpos(object):
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switch = 0
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img_size = [0, 0]
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if im.size[0] > 512:
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print ("WARNING: Image is wider than 512 and could be truncated at print time ")
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if im.size[1] > 0xffff:
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@ -103,7 +100,6 @@ class Escpos(object):
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self._print_image(pix_line, img_size)
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def image(self, path_img):
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""" Open image file """
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im_open = Image.open(path_img)
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@ -119,7 +115,6 @@ class Escpos(object):
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# Convert the RGB image in printable image
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self._convert_image(im)
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def qr(self, text):
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""" Print QR Code for the provided string """
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qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
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@ -131,7 +126,6 @@ class Escpos(object):
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# Convert the RGB image in printable image
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self._convert_image(im)
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def charcode(self, code):
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""" Set Character Code Table """
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if code.upper() == "USA":
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@ -228,8 +222,7 @@ class Escpos(object):
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if code:
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self._raw(code)
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else:
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raise exception.BarcodeCodeError()
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raise BarcodeCodeError()
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def text(self, txt):
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""" Print alpha-numeric text """
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@ -238,7 +231,6 @@ class Escpos(object):
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else:
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raise TextError()
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def set(self, align='left', font='a', type='normal', width=1, height=1, density=9):
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""" Set text properties """
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# Width
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@ -306,7 +298,6 @@ class Escpos(object):
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else: # DEFAULT: DOES NOTHING
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pass
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def cut(self, mode=''):
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""" Cut paper """
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# Fix the size between last line and cut
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@ -317,7 +308,6 @@ class Escpos(object):
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else: # DEFAULT MODE: FULL CUT
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self._raw(PAPER_FULL_CUT)
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def cashdraw(self, pin):
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""" Send pulse to kick the cash drawer """
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if pin == 2:
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@ -327,7 +317,6 @@ class Escpos(object):
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else:
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raise CashDrawerError()
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def hw(self, hw):
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""" Hardware operations """
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if hw.upper() == "INIT":
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@ -339,7 +328,6 @@ class Escpos(object):
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else: # DEFAULT: DOES NOTHING
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pass
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def control(self, ctl, pos=4):
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""" Feed control sequences """
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# Set tab positions
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@ -1,6 +1,5 @@
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""" ESC/POS Exceptions classes """
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import os
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class Error(Exception):
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""" Base class for ESC/POS errors """
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@ -35,6 +34,7 @@ class BarcodeTypeError(Error):
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def __str__(self):
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return "No Barcode type is defined"
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class BarcodeSizeError(Error):
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def __init__(self, msg=""):
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Error.__init__(self, msg)
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@ -44,6 +44,7 @@ class BarcodeSizeError(Error):
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def __str__(self):
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return "Barcode size is out of range"
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class BarcodeCodeError(Error):
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def __init__(self, msg=""):
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Error.__init__(self, msg)
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@ -53,6 +54,7 @@ class BarcodeCodeError(Error):
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def __str__(self):
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return "Code was not supplied"
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class ImageSizeError(Error):
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def __init__(self, msg=""):
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Error.__init__(self, msg)
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@ -62,6 +64,7 @@ class ImageSizeError(Error):
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def __str__(self):
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return "Image height is longer than 255px and can't be printed"
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class TextError(Error):
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def __init__(self, msg=""):
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Error.__init__(self, msg)
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@ -12,9 +12,9 @@ import serial
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import socket
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from escpos import *
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from constants import *
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from exceptions import *
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class Usb(Escpos):
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""" Define USB printer """
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@ -33,7 +33,6 @@ class Usb(Escpos):
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self.out_ep = out_ep
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self.open()
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def open(self):
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""" Search device on USB tree and set is as escpos device """
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self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
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@ -52,7 +51,7 @@ class Usb(Escpos):
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self.device.detach_kernel_driver(0)
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except usb.core.USBError as e:
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if check_driver is not None:
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print "Could not detatch kernel driver: %s" % str(e)
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print "Could not detach kernel driver: %s" % str(e)
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try:
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self.device.set_configuration()
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@ -60,12 +59,10 @@ class Usb(Escpos):
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except usb.core.USBError as e:
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print "Could not set configuration: %s" % str(e)
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.write(self.out_ep, msg, self.interface)
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def __del__(self):
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""" Release USB interface """
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if self.device:
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@ -73,7 +70,6 @@ class Usb(Escpos):
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self.device = None
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class Serial(Escpos):
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""" Define Serial printer """
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@ -103,7 +99,6 @@ class Serial(Escpos):
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self.open()
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def open(self):
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""" Setup serial port and set is as escpos device """
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self.device = serial.Serial(port=self.devfile, baudrate=self.baudrate,
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@ -116,19 +111,16 @@ class Serial(Escpos):
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else:
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print "Unable to open serial printer on: %s" % self.devfile
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.write(msg)
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def __del__(self):
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""" Close Serial interface """
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if self.device is not None:
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self.device.close()
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class Network(Escpos):
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""" Define Network printer """
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@ -141,7 +133,6 @@ class Network(Escpos):
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self.port = port
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self.open()
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def open(self):
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""" Open TCP socket and set it as escpos device """
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self.device = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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@ -150,18 +141,15 @@ class Network(Escpos):
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if self.device is None:
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print "Could not open socket for %s" % self.host
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.send(msg)
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def __del__(self):
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""" Close TCP connection """
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self.device.close()
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class File(Escpos):
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""" Define Generic file printer """
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@ -172,7 +160,6 @@ class File(Escpos):
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self.devfile = devfile
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self.open()
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def open(self):
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""" Open system file """
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self.device = open(self.devfile, "wb")
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@ -180,11 +167,9 @@ class File(Escpos):
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if self.device is None:
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print "Could not open the specified file %s" % self.devfile
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def _raw(self, msg):
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""" Print any command sent in raw format """
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self.device.write(msg);
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self.device.write(msg)
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def __del__(self):
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""" Close system file """
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