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Automatically choose correct barcode function.

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Tests for barcode function.
This commit is contained in:
Michael Elsdörfer
2016-08-30 12:53:31 +02:00
parent a07f84a5bc
commit 5fa89ff685
3 changed files with 76 additions and 14 deletions
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43
src/escpos/escpos.py
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@@ -23,7 +23,7 @@ from .exceptions import *
from abc import ABCMeta, abstractmethod # abstract base class support
from escpos.image import EscposImage
from escpos.capabilities import get_profile
from escpos.capabilities import get_profile, BARCODE_B
@six.add_metaclass(ABCMeta)
@@ -293,7 +293,8 @@ class Escpos(object):
else:
raise CharCodeError()
def barcode(self, code, bc, height=64, width=3, pos="BELOW", font="A", align_ct=True, function_type="A"):
def barcode(self, code, bc, height=64, width=3, pos="BELOW", font="A",
align_ct=True, function_type=None):
""" Print Barcode
This method allows to print barcodes. The rendering of the barcode is done by the printer and therefore has to
@@ -364,14 +365,40 @@ class Escpos(object):
issued.
:type align_ct: bool
:param function_type: Choose between ESCPOS function type A or B, depending on printer support and desired
barcode.
:param function_type: Choose between ESCPOS function type A or B,
depending on printer support and desired barcode. If not given,
the printer will attempt to automatically choose the correct
function based on the current profile.
*default*: A
:raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`,
:py:exc:`~escpos.exceptions.BarcodeTypeError`,
:py:exc:`~escpos.exceptions.BarcodeCodeError`
"""
if function_type is None:
# Choose the function type automatically.
if bc in BARCODE_TYPES['A']:
function_type = 'A'
else:
if bc in BARCODE_TYPES['B']:
if not self.profile.supports(BARCODE_B):
raise BarcodeTypeError((
"Barcode type '{bc} not supported for "
"the current printer profile").format(bc=bc))
function_type = 'B'
else:
raise BarcodeTypeError((
"Barcode type '{bc} is not valid").format(bc=bc))
bc_types = BARCODE_TYPES[function_type.upper()]
if bc.upper() not in bc_types.keys():
raise BarcodeTypeError((
"Barcode type '{bc}' not valid for barcode function type "
"{function_type}").format(
bc=bc,
function_type=function_type,
))
# Align Bar Code()
if align_ct:
self._raw(TXT_ALIGN_CT)
@@ -400,14 +427,6 @@ class Escpos(object):
else: # DEFAULT POSITION: BELOW
self._raw(BARCODE_TXT_BLW)
bc_types = BARCODE_TYPES[function_type.upper()]
if bc.upper() not in bc_types.keys():
# TODO: Raise a better error, or fix the message of this error type
raise BarcodeTypeError("Barcode type {bc} not valid for barcode function type {function_type}".format(
bc=bc,
function_type=function_type,
))
self._raw(bc_types[bc.upper()])
if function_type.upper() == "B":