152 lines
4.1 KiB
Python
152 lines
4.1 KiB
Python
import re
|
|
from os import environ, path
|
|
import pickle
|
|
import logging
|
|
import time
|
|
|
|
import six
|
|
import yaml
|
|
|
|
from tempfile import gettempdir
|
|
import platform
|
|
|
|
logging.basicConfig()
|
|
logger = logging.getLogger(__name__)
|
|
|
|
pickle_dir = environ.get('ESCPOS_CAPABILITIES_PICKLE_DIR', gettempdir())
|
|
pickle_path = path.join(pickle_dir, '{v}.capabilities.pickle'.format(v=platform.python_version()))
|
|
capabilities_path = environ.get(
|
|
'ESCPOS_CAPABILITIES_FILE',
|
|
path.join(path.dirname(__file__), 'capabilities.json'))
|
|
|
|
# Load external printer database
|
|
t0 = time.time()
|
|
logger.debug('Using capabilities from file: %s', capabilities_path)
|
|
if path.exists(pickle_path):
|
|
if path.getmtime(capabilities_path) > path.getmtime(pickle_path):
|
|
logger.debug('Found a more recent capabilities file')
|
|
full_load = True
|
|
else:
|
|
full_load = False
|
|
logger.debug('Loading capabilities from pickle in %s', pickle_path)
|
|
with open(pickle_path, 'rb') as cf:
|
|
CAPABILITIES = pickle.load(cf)
|
|
else:
|
|
logger.debug('Capabilities pickle file not found: %s', pickle_path)
|
|
full_load = True
|
|
|
|
if full_load:
|
|
logger.debug('Loading and pickling capabilities')
|
|
with open(capabilities_path) as cp, open(pickle_path, 'wb') as pp:
|
|
CAPABILITIES = yaml.safe_load(cp)
|
|
pickle.dump(CAPABILITIES, pp, protocol=2)
|
|
|
|
logger.debug('Finished loading capabilities took %.2fs', time.time() - t0)
|
|
|
|
|
|
PROFILES = CAPABILITIES['profiles']
|
|
|
|
|
|
class NotSupported(Exception):
|
|
"""Raised if a requested feature is not supported by the
|
|
printer profile.
|
|
"""
|
|
pass
|
|
|
|
|
|
BARCODE_B = 'barcodeB'
|
|
|
|
|
|
class BaseProfile(object):
|
|
"""This respresents a printer profile.
|
|
|
|
A printer profile knows about the number of columns, supported
|
|
features, colors and more.
|
|
"""
|
|
|
|
profile_data = {}
|
|
|
|
def __getattr__(self, name):
|
|
return self.profile_data[name]
|
|
|
|
def get_font(self, font):
|
|
"""Return the escpos index for `font`. Makes sure that
|
|
the requested `font` is valid.
|
|
"""
|
|
font = {'a': 0, 'b': 1}.get(font, font)
|
|
if not six.text_type(font) in self.fonts:
|
|
raise NotSupported(
|
|
'"{}" is not a valid font in the current profile'.format(font))
|
|
return font
|
|
|
|
def get_columns(self, font):
|
|
""" Return the number of columns for the given font.
|
|
"""
|
|
font = self.get_font(font)
|
|
return self.fonts[six.text_type(font)]['columns']
|
|
|
|
def supports(self, feature):
|
|
"""Return true/false for the given feature.
|
|
"""
|
|
return self.features.get(feature)
|
|
|
|
def get_code_pages(self):
|
|
"""Return the support code pages as a ``{name: index}`` dict.
|
|
"""
|
|
return {v: k for k, v in self.codePages.items()}
|
|
|
|
|
|
def get_profile(name=None, **kwargs):
|
|
"""Get the profile by name; if no name is given, return the
|
|
default profile.
|
|
"""
|
|
if isinstance(name, Profile):
|
|
return name
|
|
|
|
clazz = get_profile_class(name or 'default')
|
|
return clazz(**kwargs)
|
|
|
|
|
|
CLASS_CACHE = {}
|
|
|
|
|
|
def get_profile_class(name):
|
|
"""For the given profile name, load the data from the external
|
|
database, then generate dynamically a class.
|
|
"""
|
|
if name not in CLASS_CACHE:
|
|
profile_data = PROFILES[name]
|
|
profile_name = clean(name)
|
|
class_name = '{}{}Profile'.format(
|
|
profile_name[0].upper(), profile_name[1:])
|
|
new_class = type(class_name, (BaseProfile,), {'profile_data': profile_data})
|
|
CLASS_CACHE[name] = new_class
|
|
|
|
return CLASS_CACHE[name]
|
|
|
|
|
|
def clean(s):
|
|
# Remove invalid characters
|
|
s = re.sub('[^0-9a-zA-Z_]', '', s)
|
|
# Remove leading characters until we find a letter or underscore
|
|
s = re.sub('^[^a-zA-Z_]+', '', s)
|
|
return str(s)
|
|
|
|
|
|
class Profile(get_profile_class('default')):
|
|
"""
|
|
For users, who want to provide their profile
|
|
"""
|
|
|
|
def __init__(self, columns=None, features=None):
|
|
super(Profile, self).__init__()
|
|
|
|
self.columns = columns
|
|
self.features = features or {}
|
|
|
|
def get_columns(self, font):
|
|
if self.columns is not None:
|
|
return self.columns
|
|
|
|
return super(Profile, self).get_columns(font)
|