REFACTOR style and PEP8, fixes #66
This commit is contained in:
Patrick Kanzler
parent
096445631f
commit
07d8e073ae
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@ -1 +1 @@
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__all__ = ["constants","escpos","exceptions","printer"]
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__all__ = ["constants", "escpos", "exceptions", "printer"]
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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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@ -41,12 +40,12 @@ class Escpos(object):
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buffer = ""
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self._raw(S_RASTER_N)
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buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1]&0xff, size[1]>>8)
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buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1] & 0xff, size[1] >> 8)
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self._raw(buffer.decode('hex'))
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buffer = ""
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while i < len(line):
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hex_string = int(line[i:i+8],2)
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hex_string = int(line[i:i+8], 2)
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buffer += "%02X" % hex_string
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i += 8
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cont += 1
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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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@ -63,8 +61,7 @@ class Escpos(object):
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im_left = ""
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im_right = ""
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switch = 0
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img_size = [ 0, 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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@ -87,7 +84,7 @@ class Escpos(object):
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im_color = (RGB[0] + RGB[1] + RGB[2])
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im_pattern = "1X0"
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pattern_len = len(im_pattern)
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switch = (switch - 1 ) * (-1)
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switch = (switch - 1) * (-1)
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for x in range(pattern_len):
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if im_color <= (255 * 3 / pattern_len * (x+1)):
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if im_pattern[x] == "X":
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@ -103,8 +100,7 @@ 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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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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@ -119,8 +115,7 @@ 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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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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qr_code.add_data(text)
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@ -131,8 +126,7 @@ 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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def charcode(self, code):
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""" Set Character Code Table """
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if code.upper() == "USA":
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self._raw(CHARCODE_PC437)
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@ -184,12 +178,12 @@ class Escpos(object):
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# Align Bar Code()
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self._raw(TXT_ALIGN_CT)
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# Height
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if height >=2 or height <=6:
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if height >= 2 or height <= 6:
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self._raw(BARCODE_HEIGHT)
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else:
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raise BarcodeSizeError()
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# Width
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if width >= 1 or width <=255:
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if width >= 1 or width <= 255:
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self._raw(BARCODE_WIDTH)
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else:
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raise BarcodeSizeError()
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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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@ -303,10 +295,9 @@ class Escpos(object):
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self._raw(PD_P37)
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elif density == 8:
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self._raw(PD_P50)
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else:# DEFAULT: DOES NOTHING
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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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@ -339,14 +328,13 @@ 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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if pos < 1 or pos > 16:
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raise TabError()
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else:
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self._raw("".join([CTL_SET_HT,hex(pos)]))
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self._raw("".join([CTL_SET_HT, hex(pos)]))
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# Set position
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if ctl.upper() == "LF":
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self._raw(CTL_LF)
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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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@ -73,13 +70,12 @@ 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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def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1,
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parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,
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xonxoff=False , dsrdtr=True):
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xonxoff=False, dsrdtr=True):
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"""
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@param devfile : Device file under dev filesystem
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@param baudrate : Baud rate for serial transmission
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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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@ -116,23 +111,20 @@ 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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def __init__(self,host,port=9100):
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def __init__(self, host, port=9100):
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"""
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@param host : Printer's hostname or IP address
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@param port : Port to write to
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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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