flectra/addons/hw_escpos/escpos/escpos.py

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# -*- coding: utf-8 -*-
from __future__ import print_function
import base64
import copy
import io
import math
import re
import traceback
from hashlib import md5
from PIL import Image
from xml.etree import ElementTree as ET
2018-01-16 11:34:37 +01:00
from flectra.tools import pycompat
try:
import jcconv
except ImportError:
jcconv = None
try:
import qrcode
except ImportError:
qrcode = None
from .constants import *
from .exceptions import *
def utfstr(stuff):
""" converts stuff to string and does without failing if stuff is a utf8 string """
if isinstance(stuff,pycompat.string_types):
return stuff
else:
return str(stuff)
class StyleStack:
"""
The stylestack is used by the xml receipt serializer to compute the active styles along the xml
document. Styles are just xml attributes, there is no css mechanism. But the style applied by
the attributes are inherited by deeper nodes.
"""
def __init__(self):
self.stack = []
self.defaults = { # default style values
'align': 'left',
'underline': 'off',
'bold': 'off',
'size': 'normal',
'font' : 'a',
'width': 48,
'indent': 0,
'tabwidth': 2,
'bullet': ' - ',
'line-ratio':0.5,
'color': 'black',
'value-decimals': 2,
'value-symbol': '',
'value-symbol-position': 'after',
'value-autoint': 'off',
'value-decimals-separator': '.',
'value-thousands-separator': ',',
'value-width': 0,
}
self.types = { # attribute types, default is string and can be ommitted
'width': 'int',
'indent': 'int',
'tabwidth': 'int',
'line-ratio': 'float',
'value-decimals': 'int',
'value-width': 'int',
}
self.cmds = {
# translation from styles to escpos commands
# some style do not correspond to escpos command are used by
# the serializer instead
'align': {
'left': TXT_ALIGN_LT,
'right': TXT_ALIGN_RT,
'center': TXT_ALIGN_CT,
'_order': 1,
},
'underline': {
'off': TXT_UNDERL_OFF,
'on': TXT_UNDERL_ON,
'double': TXT_UNDERL2_ON,
# must be issued after 'size' command
# because ESC ! resets ESC -
'_order': 10,
},
'bold': {
'off': TXT_BOLD_OFF,
'on': TXT_BOLD_ON,
# must be issued after 'size' command
# because ESC ! resets ESC -
'_order': 10,
},
'font': {
'a': TXT_FONT_A,
'b': TXT_FONT_B,
# must be issued after 'size' command
# because ESC ! resets ESC -
'_order': 10,
},
'size': {
'normal': TXT_NORMAL,
'double-height': TXT_2HEIGHT,
'double-width': TXT_2WIDTH,
'double': TXT_DOUBLE,
'_order': 1,
},
'color': {
'black': TXT_COLOR_BLACK,
'red': TXT_COLOR_RED,
'_order': 1,
},
}
self.push(self.defaults)
def get(self,style):
""" what's the value of a style at the current stack level"""
level = len(self.stack) -1
while level >= 0:
if style in self.stack[level]:
return self.stack[level][style]
else:
level = level - 1
return None
def enforce_type(self, attr, val):
"""converts a value to the attribute's type"""
if not attr in self.types:
return utfstr(val)
elif self.types[attr] == 'int':
return int(float(val))
elif self.types[attr] == 'float':
return float(val)
else:
return utfstr(val)
def push(self, style={}):
"""push a new level on the stack with a style dictionnary containing style:value pairs"""
_style = {}
for attr in style:
if attr in self.cmds and not style[attr] in self.cmds[attr]:
print('WARNING: ESC/POS PRINTING: ignoring invalid value: %s for style %s' % (style[attr], utfstr(attr)))
else:
_style[attr] = self.enforce_type(attr, style[attr])
self.stack.append(_style)
def set(self, style={}):
"""overrides style values at the current stack level"""
_style = {}
for attr in style:
if attr in self.cmds and not style[attr] in self.cmds[attr]:
print('WARNING: ESC/POS PRINTING: ignoring invalid value: %s for style %s' % (style[attr], attr))
else:
self.stack[-1][attr] = self.enforce_type(attr, style[attr])
def pop(self):
""" pop a style stack level """
if len(self.stack) > 1 :
self.stack = self.stack[:-1]
def to_escpos(self):
""" converts the current style to an escpos command string """
cmd = ''
ordered_cmds = sorted(self.cmds, key=lambda x: self.cmds[x]['_order'])
for style in ordered_cmds:
cmd += self.cmds[style][self.get(style)]
return cmd
class XmlSerializer:
"""
Converts the xml inline / block tree structure to a string,
keeping track of newlines and spacings.
The string is outputted asap to the provided escpos driver.
"""
def __init__(self,escpos):
self.escpos = escpos
self.stack = ['block']
self.dirty = False
def start_inline(self,stylestack=None):
""" starts an inline entity with an optional style definition """
self.stack.append('inline')
if self.dirty:
self.escpos._raw(' ')
if stylestack:
self.style(stylestack)
def start_block(self,stylestack=None):
""" starts a block entity with an optional style definition """
if self.dirty:
self.escpos._raw('\n')
self.dirty = False
self.stack.append('block')
if stylestack:
self.style(stylestack)
def end_entity(self):
""" ends the entity definition. (but does not cancel the active style!) """
if self.stack[-1] == 'block' and self.dirty:
self.escpos._raw('\n')
self.dirty = False
if len(self.stack) > 1:
self.stack = self.stack[:-1]
def pre(self,text):
""" puts a string of text in the entity keeping the whitespace intact """
if text:
self.escpos.text(text)
self.dirty = True
def text(self,text):
""" puts text in the entity. Whitespace and newlines are stripped to single spaces. """
if text:
text = utfstr(text)
text = text.strip()
text = re.sub('\s+',' ',text)
if text:
self.dirty = True
self.escpos.text(text)
def linebreak(self):
""" inserts a linebreak in the entity """
self.dirty = False
self.escpos._raw('\n')
def style(self,stylestack):
""" apply a style to the entity (only applies to content added after the definition) """
self.raw(stylestack.to_escpos())
def raw(self,raw):
""" puts raw text or escpos command in the entity without affecting the state of the serializer """
self.escpos._raw(raw)
class XmlLineSerializer:
"""
This is used to convert a xml tree into a single line, with a left and a right part.
The content is not output to escpos directly, and is intended to be fedback to the
XmlSerializer as the content of a block entity.
"""
def __init__(self, indent=0, tabwidth=2, width=48, ratio=0.5):
self.tabwidth = tabwidth
self.indent = indent
self.width = max(0, width - int(tabwidth*indent))
self.lwidth = int(self.width*ratio)
self.rwidth = max(0, self.width - self.lwidth)
self.clwidth = 0
self.crwidth = 0
self.lbuffer = ''
self.rbuffer = ''
self.left = True
def _txt(self,txt):
if self.left:
if self.clwidth < self.lwidth:
txt = txt[:max(0, self.lwidth - self.clwidth)]
self.lbuffer += txt
self.clwidth += len(txt)
else:
if self.crwidth < self.rwidth:
txt = txt[:max(0, self.rwidth - self.crwidth)]
self.rbuffer += txt
self.crwidth += len(txt)
def start_inline(self,stylestack=None):
if (self.left and self.clwidth) or (not self.left and self.crwidth):
self._txt(' ')
def start_block(self,stylestack=None):
self.start_inline(stylestack)
def end_entity(self):
pass
def pre(self,text):
if text:
self._txt(text)
def text(self,text):
if text:
text = utfstr(text)
text = text.strip()
text = re.sub('\s+',' ',text)
if text:
self._txt(text)
def linebreak(self):
pass
def style(self,stylestack):
pass
def raw(self,raw):
pass
def start_right(self):
self.left = False
def get_line(self):
return ' ' * self.indent * self.tabwidth + self.lbuffer + ' ' * (self.width - self.clwidth - self.crwidth) + self.rbuffer
class Escpos:
""" ESC/POS Printer object """
device = None
encoding = None
img_cache = {}
def _check_image_size(self, size):
""" Check and fix the size of the image to 32 bits """
if size % 32 == 0:
return (0, 0)
else:
image_border = 32 - (size % 32)
if (image_border % 2) == 0:
return (image_border / 2, image_border / 2)
else:
return (image_border / 2, (image_border / 2) + 1)
def _print_image(self, line, size):
""" Print formatted image """
i = 0
cont = 0
buffer = ""
self._raw(S_RASTER_N)
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1], 0)
self._raw(buffer.decode('hex'))
buffer = ""
while i < len(line):
hex_string = int(line[i:i+8],2)
buffer += "%02X" % hex_string
i += 8
cont += 1
if cont % 4 == 0:
self._raw(buffer.decode("hex"))
buffer = ""
cont = 0
def _raw_print_image(self, line, size, output=None ):
""" Print formatted image """
i = 0
cont = 0
buffer = ""
raw = ""
def __raw(string):
if output:
output(string)
else:
self._raw(string)
raw += S_RASTER_N
buffer = "%02X%02X%02X%02X" % (((size[0]/size[1])/8), 0, size[1], 0)
raw += buffer.decode('hex')
buffer = ""
while i < len(line):
hex_string = int(line[i:i+8],2)
buffer += "%02X" % hex_string
i += 8
cont += 1
if cont % 4 == 0:
raw += buffer.decode("hex")
buffer = ""
cont = 0
return raw
def _convert_image(self, im):
""" Parse image and prepare it to a printable format """
pixels = []
pix_line = ""
im_left = ""
im_right = ""
switch = 0
img_size = [ 0, 0 ]
if im.size[0] > 512:
print("WARNING: Image is wider than 512 and could be truncated at print time ")
if im.size[1] > 255:
raise ImageSizeError()
im_border = self._check_image_size(im.size[0])
for i in range(im_border[0]):
im_left += "0"
for i in range(im_border[1]):
im_right += "0"
for y in range(im.size[1]):
img_size[1] += 1
pix_line += im_left
img_size[0] += im_border[0]
for x in range(im.size[0]):
img_size[0] += 1
RGB = im.getpixel((x, y))
im_color = (RGB[0] + RGB[1] + RGB[2])
im_pattern = "1X0"
pattern_len = len(im_pattern)
switch = (switch - 1 ) * (-1)
for x in range(pattern_len):
if im_color <= (255 * 3 / pattern_len * (x+1)):
if im_pattern[x] == "X":
pix_line += "%d" % switch
else:
pix_line += im_pattern[x]
break
elif im_color > (255 * 3 / pattern_len * pattern_len) and im_color <= (255 * 3):
pix_line += im_pattern[-1]
break
pix_line += im_right
img_size[0] += im_border[1]
return (pix_line, img_size)
def image(self,path_img):
""" Open image file """
im_open = Image.open(path_img)
im = im_open.convert("RGB")
# Convert the RGB image in printable image
pix_line, img_size = self._convert_image(im)
self._print_image(pix_line, img_size)
def print_base64_image(self,img):
print('print_b64_img')
id = md5(img.encode('utf-8')).digest()
if id not in self.img_cache:
print('not in cache')
img = img[img.find(',')+1:]
f = io.BytesIO('img')
f.write(base64.decodestring(img))
f.seek(0)
img_rgba = Image.open(f)
img = Image.new('RGB', img_rgba.size, (255,255,255))
channels = img_rgba.split()
if len(channels) > 3:
# use alpha channel as mask
img.paste(img_rgba, mask=channels[3])
else:
img.paste(img_rgba)
print('convert image')
pix_line, img_size = self._convert_image(img)
print('print image')
buffer = self._raw_print_image(pix_line, img_size)
self.img_cache[id] = buffer
print('raw image')
self._raw(self.img_cache[id])
def qr(self,text):
""" Print QR Code for the provided string """
qr_code = qrcode.QRCode(version=4, box_size=4, border=1)
qr_code.add_data(text)
qr_code.make(fit=True)
qr_img = qr_code.make_image()
im = qr_img._img.convert("RGB")
# Convert the RGB image in printable image
self._convert_image(im)
def barcode(self, code, bc, width=255, height=2, pos='below', font='a'):
""" Print Barcode """
# Align Bar Code()
self._raw(TXT_ALIGN_CT)
# Height
if height >=2 or height <=6:
self._raw(BARCODE_HEIGHT)
else:
raise BarcodeSizeError()
# Width
if width >= 1 or width <=255:
self._raw(BARCODE_WIDTH)
else:
raise BarcodeSizeError()
# Font
if font.upper() == "B":
self._raw(BARCODE_FONT_B)
else: # DEFAULT FONT: A
self._raw(BARCODE_FONT_A)
# Position
if pos.upper() == "OFF":
self._raw(BARCODE_TXT_OFF)
elif pos.upper() == "BOTH":
self._raw(BARCODE_TXT_BTH)
elif pos.upper() == "ABOVE":
self._raw(BARCODE_TXT_ABV)
else: # DEFAULT POSITION: BELOW
self._raw(BARCODE_TXT_BLW)
# Type
if bc.upper() == "UPC-A":
self._raw(BARCODE_UPC_A)
elif bc.upper() == "UPC-E":
self._raw(BARCODE_UPC_E)
elif bc.upper() == "EAN13":
self._raw(BARCODE_EAN13)
elif bc.upper() == "EAN8":
self._raw(BARCODE_EAN8)
elif bc.upper() == "CODE39":
self._raw(BARCODE_CODE39)
elif bc.upper() == "ITF":
self._raw(BARCODE_ITF)
elif bc.upper() == "NW7":
self._raw(BARCODE_NW7)
else:
raise BarcodeTypeError()
# Print Code
if code:
self._raw(code)
else:
raise exception.BarcodeCodeError()
def receipt(self,xml):
"""
Prints an xml based receipt definition
"""
def strclean(string):
if not string:
string = ''
string = string.strip()
string = re.sub('\s+',' ',string)
return string
def format_value(value, decimals=3, width=0, decimals_separator='.', thousands_separator=',', autoint=False, symbol='', position='after'):
decimals = max(0,int(decimals))
width = max(0,int(width))
value = float(value)
if autoint and math.floor(value) == value:
decimals = 0
if width == 0:
width = ''
if thousands_separator:
formatstr = "{:"+str(width)+",."+str(decimals)+"f}"
else:
formatstr = "{:"+str(width)+"."+str(decimals)+"f}"
ret = formatstr.format(value)
ret = ret.replace(',','COMMA')
ret = ret.replace('.','DOT')
ret = ret.replace('COMMA',thousands_separator)
ret = ret.replace('DOT',decimals_separator)
if symbol:
if position == 'after':
ret = ret + symbol
else:
ret = symbol + ret
return ret
def print_elem(stylestack, serializer, elem, indent=0):
elem_styles = {
'h1': {'bold': 'on', 'size':'double'},
'h2': {'size':'double'},
'h3': {'bold': 'on', 'size':'double-height'},
'h4': {'size': 'double-height'},
'h5': {'bold': 'on'},
'em': {'font': 'b'},
'b': {'bold': 'on'},
}
stylestack.push()
if elem.tag in elem_styles:
stylestack.set(elem_styles[elem.tag])
stylestack.set(elem.attrib)
if elem.tag in ('p','div','section','article','receipt','header','footer','li','h1','h2','h3','h4','h5'):
serializer.start_block(stylestack)
serializer.text(elem.text)
for child in elem:
print_elem(stylestack,serializer,child)
serializer.start_inline(stylestack)
serializer.text(child.tail)
serializer.end_entity()
serializer.end_entity()
elif elem.tag in ('span','em','b','left','right'):
serializer.start_inline(stylestack)
serializer.text(elem.text)
for child in elem:
print_elem(stylestack,serializer,child)
serializer.start_inline(stylestack)
serializer.text(child.tail)
serializer.end_entity()
serializer.end_entity()
elif elem.tag == 'value':
serializer.start_inline(stylestack)
serializer.pre(format_value(
elem.text,
decimals=stylestack.get('value-decimals'),
width=stylestack.get('value-width'),
decimals_separator=stylestack.get('value-decimals-separator'),
thousands_separator=stylestack.get('value-thousands-separator'),
autoint=(stylestack.get('value-autoint') == 'on'),
symbol=stylestack.get('value-symbol'),
position=stylestack.get('value-symbol-position')
))
serializer.end_entity()
elif elem.tag == 'line':
width = stylestack.get('width')
if stylestack.get('size') in ('double', 'double-width'):
width = width / 2
lineserializer = XmlLineSerializer(stylestack.get('indent')+indent,stylestack.get('tabwidth'),width,stylestack.get('line-ratio'))
serializer.start_block(stylestack)
for child in elem:
if child.tag == 'left':
print_elem(stylestack,lineserializer,child,indent=indent)
elif child.tag == 'right':
lineserializer.start_right()
print_elem(stylestack,lineserializer,child,indent=indent)
serializer.pre(lineserializer.get_line())
serializer.end_entity()
elif elem.tag == 'ul':
serializer.start_block(stylestack)
bullet = stylestack.get('bullet')
for child in elem:
if child.tag == 'li':
serializer.style(stylestack)
serializer.raw(' ' * indent * stylestack.get('tabwidth') + bullet)
print_elem(stylestack,serializer,child,indent=indent+1)
serializer.end_entity()
elif elem.tag == 'ol':
cwidth = len(str(len(elem))) + 2
i = 1
serializer.start_block(stylestack)
for child in elem:
if child.tag == 'li':
serializer.style(stylestack)
serializer.raw(' ' * indent * stylestack.get('tabwidth') + ' ' + (str(i)+')').ljust(cwidth))
i = i + 1
print_elem(stylestack,serializer,child,indent=indent+1)
serializer.end_entity()
elif elem.tag == 'pre':
serializer.start_block(stylestack)
serializer.pre(elem.text)
serializer.end_entity()
elif elem.tag == 'hr':
width = stylestack.get('width')
if stylestack.get('size') in ('double', 'double-width'):
width = width / 2
serializer.start_block(stylestack)
serializer.text('-'*width)
serializer.end_entity()
elif elem.tag == 'br':
serializer.linebreak()
elif elem.tag == 'img':
if 'src' in elem.attrib and 'data:' in elem.attrib['src']:
self.print_base64_image(elem.attrib['src'])
elif elem.tag == 'barcode' and 'encoding' in elem.attrib:
serializer.start_block(stylestack)
self.barcode(strclean(elem.text),elem.attrib['encoding'])
serializer.end_entity()
elif elem.tag == 'cut':
self.cut()
elif elem.tag == 'partialcut':
self.cut(mode='part')
elif elem.tag == 'cashdraw':
self.cashdraw(2)
self.cashdraw(5)
stylestack.pop()
try:
stylestack = StyleStack()
serializer = XmlSerializer(self)
root = ET.fromstring(xml.encode('utf-8'))
self._raw(stylestack.to_escpos())
print_elem(stylestack,serializer,root)
if 'open-cashdrawer' in root.attrib and root.attrib['open-cashdrawer'] == 'true':
self.cashdraw(2)
self.cashdraw(5)
if not 'cut' in root.attrib or root.attrib['cut'] == 'true' :
self.cut()
except Exception as e:
errmsg = str(e)+'\n'+'-'*48+'\n'+traceback.format_exc() + '-'*48+'\n'
self.text(errmsg)
self.cut()
raise e
def text(self,txt):
""" Print Utf8 encoded alpha-numeric text """
if not txt:
return
try:
txt = txt.decode('utf-8')
except:
try:
txt = txt.decode('utf-16')
except:
pass
self.extra_chars = 0
def encode_char(char):
"""
Encodes a single utf-8 character into a sequence of
esc-pos code page change instructions and character declarations
"""
char_utf8 = char.encode('utf-8')
encoded = ''
encoding = self.encoding # we reuse the last encoding to prevent code page switches at every character
encodings = {
# TODO use ordering to prevent useless switches
# TODO Support other encodings not natively supported by python ( Thai, Khazakh, Kanjis )
'cp437': TXT_ENC_PC437,
'cp850': TXT_ENC_PC850,
'cp852': TXT_ENC_PC852,
'cp857': TXT_ENC_PC857,
'cp858': TXT_ENC_PC858,
'cp860': TXT_ENC_PC860,
'cp863': TXT_ENC_PC863,
'cp865': TXT_ENC_PC865,
'cp866': TXT_ENC_PC866,
'cp862': TXT_ENC_PC862,
'cp720': TXT_ENC_PC720,
'cp936': TXT_ENC_PC936,
'iso8859_2': TXT_ENC_8859_2,
'iso8859_7': TXT_ENC_8859_7,
'iso8859_9': TXT_ENC_8859_9,
'cp1254' : TXT_ENC_WPC1254,
'cp1255' : TXT_ENC_WPC1255,
'cp1256' : TXT_ENC_WPC1256,
'cp1257' : TXT_ENC_WPC1257,
'cp1258' : TXT_ENC_WPC1258,
'katakana' : TXT_ENC_KATAKANA,
}
remaining = copy.copy(encodings)
if not encoding :
encoding = 'cp437'
while True: # Trying all encoding until one succeeds
try:
if encoding == 'katakana': # Japanese characters
if jcconv:
# try to convert japanese text to a half-katakanas
kata = jcconv.kata2half(jcconv.hira2kata(char_utf8))
if kata != char_utf8:
self.extra_chars += len(kata.decode('utf-8')) - 1
# the conversion may result in multiple characters
return encode_str(kata.decode('utf-8'))
else:
kata = char_utf8
if kata in TXT_ENC_KATAKANA_MAP:
encoded = TXT_ENC_KATAKANA_MAP[kata]
break
else:
raise ValueError()
else:
encoded = char.encode(encoding)
break
except ValueError: #the encoding failed, select another one and retry
if encoding in remaining:
del remaining[encoding]
if len(remaining) >= 1:
(encoding, _) = remaining.popitem()
else:
encoding = 'cp437'
encoded = '\xb1' # could not encode, output error character
break;
if encoding != self.encoding:
# if the encoding changed, remember it and prefix the character with
# the esc-pos encoding change sequence
self.encoding = encoding
encoded = encodings[encoding] + encoded
return encoded
def encode_str(txt):
buffer = ''
for c in txt:
buffer += encode_char(c)
return buffer
txt = encode_str(txt)
# if the utf-8 -> codepage conversion inserted extra characters,
# remove double spaces to try to restore the original string length
# and prevent printing alignment issues
while self.extra_chars > 0:
dspace = txt.find(' ')
if dspace > 0:
txt = txt[:dspace] + txt[dspace+1:]
self.extra_chars -= 1
else:
break
self._raw(txt)
def set(self, align='left', font='a', type='normal', width=1, height=1):
""" Set text properties """
# Align
if align.upper() == "CENTER":
self._raw(TXT_ALIGN_CT)
elif align.upper() == "RIGHT":
self._raw(TXT_ALIGN_RT)
elif align.upper() == "LEFT":
self._raw(TXT_ALIGN_LT)
# Font
if font.upper() == "B":
self._raw(TXT_FONT_B)
else: # DEFAULT FONT: A
self._raw(TXT_FONT_A)
# Type
if type.upper() == "B":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_OFF)
elif type.upper() == "U":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_ON)
elif type.upper() == "U2":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL2_ON)
elif type.upper() == "BU":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_ON)
elif type.upper() == "BU2":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL2_ON)
elif type.upper == "NORMAL":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_OFF)
# Width
if width == 2 and height != 2:
self._raw(TXT_NORMAL)
self._raw(TXT_2WIDTH)
elif height == 2 and width != 2:
self._raw(TXT_NORMAL)
self._raw(TXT_2HEIGHT)
elif height == 2 and width == 2:
self._raw(TXT_2WIDTH)
self._raw(TXT_2HEIGHT)
else: # DEFAULT SIZE: NORMAL
self._raw(TXT_NORMAL)
def cut(self, mode=''):
""" Cut paper """
# Fix the size between last line and cut
# TODO: handle this with a line feed
self._raw("\n\n\n\n\n\n")
if mode.upper() == "PART":
self._raw(PAPER_PART_CUT)
else: # DEFAULT MODE: FULL CUT
self._raw(PAPER_FULL_CUT)
def cashdraw(self, pin):
""" Send pulse to kick the cash drawer """
if pin == 2:
self._raw(CD_KICK_2)
elif pin == 5:
self._raw(CD_KICK_5)
else:
raise CashDrawerError()
def hw(self, hw):
""" Hardware operations """
if hw.upper() == "INIT":
self._raw(HW_INIT)
elif hw.upper() == "SELECT":
self._raw(HW_SELECT)
elif hw.upper() == "RESET":
self._raw(HW_RESET)
else: # DEFAULT: DOES NOTHING
pass
def control(self, ctl):
""" Feed control sequences """
if ctl.upper() == "LF":
self._raw(CTL_LF)
elif ctl.upper() == "FF":
self._raw(CTL_FF)
elif ctl.upper() == "CR":
self._raw(CTL_CR)
elif ctl.upper() == "HT":
self._raw(CTL_HT)
elif ctl.upper() == "VT":
self._raw(CTL_VT)